/* * fs/cifs/smb2pdu.c * * Copyright (C) International Business Machines Corp., 2009, 2013 * 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 #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" #include "cifs_spnego.h" #include "smbdirect.h" #include "trace.h" #ifdef CONFIG_CIFS_DFS_UPCALL #include "dfs_cache.h" #endif /* * 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 */ }; int smb3_encryption_required(const struct cifs_tcon *tcon) { if (!tcon) return 0; if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) || (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA)) return 1; if (tcon->seal && (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)) return 1; return 0; } static void smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd, const struct cifs_tcon *tcon) { shdr->ProtocolId = SMB2_PROTO_NUMBER; shdr->StructureSize = cpu_to_le16(64); shdr->Command = smb2_cmd; if (tcon && tcon->ses && tcon->ses->server) { struct TCP_Server_Info *server = tcon->ses->server; spin_lock(&server->req_lock); /* Request up to 10 credits but don't go over the limit. */ if (server->credits >= server->max_credits) shdr->CreditRequest = cpu_to_le16(0); else shdr->CreditRequest = cpu_to_le16( min_t(int, server->max_credits - server->credits, 10)); spin_unlock(&server->req_lock); } else { shdr->CreditRequest = cpu_to_le16(2); } shdr->ProcessId = cpu_to_le32((__u16)current->tgid); if (!tcon) goto out; /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */ /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */ if ((tcon->ses) && (tcon->ses->server) && (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU)) shdr->CreditCharge = cpu_to_le16(1); /* else CreditCharge MBZ */ shdr->TreeId = tcon->tid; /* Uid is not converted */ if (tcon->ses) shdr->SessionId = tcon->ses->Suid; /* * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have * to pass the path on the Open SMB prefixed by \\server\share. * Not sure when we would need to do the augmented path (if ever) and * setting this flag breaks the SMB2 open operation since it is * illegal to send an empty path name (without \\server\share prefix) * when the DFS flag is set in the SMB open header. We could * consider setting the flag on all operations other than open * but it is safer to net set it for now. */ /* if (tcon->share_flags & SHI1005_FLAGS_DFS) shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */ if (tcon->ses && tcon->ses->server && tcon->ses->server->sign && !smb3_encryption_required(tcon)) shdr->Flags |= SMB2_FLAGS_SIGNED; out: return; } #ifdef CONFIG_CIFS_DFS_UPCALL static int __smb2_reconnect(const struct nls_table *nlsc, struct cifs_tcon *tcon) { int rc; struct dfs_cache_tgt_list tl; struct dfs_cache_tgt_iterator *it = NULL; char *tree; const char *tcp_host; size_t tcp_host_len; const char *dfs_host; size_t dfs_host_len; tree = kzalloc(MAX_TREE_SIZE, GFP_KERNEL); if (!tree) return -ENOMEM; if (tcon->ipc) { scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$", tcon->ses->server->hostname); rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc); goto out; } if (!tcon->dfs_path) { rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nlsc); goto out; } rc = dfs_cache_noreq_find(tcon->dfs_path + 1, NULL, &tl); if (rc) goto out; extract_unc_hostname(tcon->ses->server->hostname, &tcp_host, &tcp_host_len); for (it = dfs_cache_get_tgt_iterator(&tl); it; it = dfs_cache_get_next_tgt(&tl, it)) { const char *share, *prefix; size_t share_len, prefix_len; rc = dfs_cache_get_tgt_share(it, &share, &share_len, &prefix, &prefix_len); if (rc) { cifs_dbg(VFS, "%s: failed to parse target share %d\n", __func__, rc); continue; } extract_unc_hostname(share, &dfs_host, &dfs_host_len); if (dfs_host_len != tcp_host_len || strncasecmp(dfs_host, tcp_host, dfs_host_len) != 0) { cifs_dbg(FYI, "%s: skipping %.*s, doesn't match %.*s", __func__, (int)dfs_host_len, dfs_host, (int)tcp_host_len, tcp_host); continue; } scnprintf(tree, MAX_TREE_SIZE, "\\%.*s", (int)share_len, share); rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc); if (!rc) { rc = update_super_prepath(tcon, prefix, prefix_len); break; } if (rc == -EREMOTE) break; } if (!rc) { if (it) rc = dfs_cache_noreq_update_tgthint(tcon->dfs_path + 1, it); else rc = -ENOENT; } dfs_cache_free_tgts(&tl); out: kfree(tree); return rc; } #else static inline int __smb2_reconnect(const struct nls_table *nlsc, struct cifs_tcon *tcon) { return SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nlsc); } #endif static int smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon) { int rc; struct nls_table *nls_codepage; struct cifs_ses *ses; struct TCP_Server_Info *server; int retries; /* * 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 0; if (smb2_command == SMB2_TREE_CONNECT) return 0; 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; retries = server->nr_targets; /* * Give demultiplex thread up to 10 seconds to each target available for * 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; } rc = wait_event_interruptible_timeout(server->response_q, (server->tcpStatus != CifsNeedReconnect), 10 * HZ); if (rc < 0) { cifs_dbg(FYI, "%s: aborting reconnect due to a received" " signal by the process\n", __func__); return -ERESTARTSYS; } /* are we still trying to reconnect? */ if (server->tcpStatus != CifsNeedReconnect) break; if (retries && --retries) continue; /* * 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; } retries = server->nr_targets; } if (!tcon->ses->need_reconnect && !tcon->need_reconnect) return 0; nls_codepage = load_nls_default(); /* * need to prevent multiple threads trying to simultaneously reconnect * the same SMB session */ mutex_lock(&tcon->ses->session_mutex); /* * Recheck after acquire mutex. If another thread is negotiating * and the server never sends an answer the socket will be closed * and tcpStatus set to reconnect. */ if (server->tcpStatus == CifsNeedReconnect) { rc = -EHOSTDOWN; mutex_unlock(&tcon->ses->session_mutex); goto out; } rc = cifs_negotiate_protocol(0, tcon->ses); if (!rc && tcon->ses->need_reconnect) { rc = cifs_setup_session(0, tcon->ses, nls_codepage); if ((rc == -EACCES) && !tcon->retry) { rc = -EHOSTDOWN; mutex_unlock(&tcon->ses->session_mutex); goto failed; } } if (rc || !tcon->need_reconnect) { mutex_unlock(&tcon->ses->session_mutex); goto out; } cifs_mark_open_files_invalid(tcon); if (tcon->use_persistent) tcon->need_reopen_files = true; rc = __smb2_reconnect(nls_codepage, tcon); mutex_unlock(&tcon->ses->session_mutex); cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc); if (rc) { /* If sess reconnected but tcon didn't, something strange ... */ printk_once(KERN_WARNING "reconnect tcon failed rc = %d\n", rc); goto out; } if (smb2_command != SMB2_INTERNAL_CMD) mod_delayed_work(cifsiod_wq, &server->reconnect, 0); atomic_inc(&tconInfoReconnectCount); 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: rc = -EAGAIN; } failed: unload_nls(nls_codepage); return rc; } static void fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf, unsigned int *total_len) { struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf; /* lookup word count ie StructureSize from table */ __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)]; /* * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of * largest operations (Create) */ memset(buf, 0, 256); smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon); spdu->StructureSize2 = cpu_to_le16(parmsize); *total_len = parmsize + sizeof(struct smb2_sync_hdr); } /* * 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 __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon, void **request_buf, unsigned int *total_len) { /* BB eventually switch this to SMB2 specific small buf size */ if (smb2_command == SMB2_SET_INFO) *request_buf = cifs_buf_get(); else *request_buf = cifs_small_buf_get(); if (*request_buf == NULL) { /* BB should we add a retry in here if not a writepage? */ return -ENOMEM; } fill_small_buf(smb2_command, tcon, (struct smb2_sync_hdr *)(*request_buf), total_len); if (tcon != NULL) { uint16_t com_code = le16_to_cpu(smb2_command); cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]); cifs_stats_inc(&tcon->num_smbs_sent); } return 0; } static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon, void **request_buf, unsigned int *total_len) { int rc; rc = smb2_reconnect(smb2_command, tcon); if (rc) return rc; return __smb2_plain_req_init(smb2_command, tcon, request_buf, total_len); } static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon, void **request_buf, unsigned int *total_len) { /* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */ if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) { return __smb2_plain_req_init(SMB2_IOCTL, tcon, request_buf, total_len); } return smb2_plain_req_init(SMB2_IOCTL, tcon, request_buf, total_len); } /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */ static void build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt) { pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES; pneg_ctxt->DataLength = cpu_to_le16(38); pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1); pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE); get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE); pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512; } static void build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt) { pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES; pneg_ctxt->DataLength = cpu_to_le16(sizeof(struct smb2_compression_capabilities_context) - sizeof(struct smb2_neg_context)); pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3); pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77; pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF; pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1; } static void build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt) { pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES; pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + two ciphers */ pneg_ctxt->CipherCount = cpu_to_le16(2); pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM; pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM; } static unsigned int build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname) { struct nls_table *cp = load_nls_default(); pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID; /* copy up to max of first 100 bytes of server name to NetName field */ pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp)); /* context size is DataLength + minimal smb2_neg_context */ return DIV_ROUND_UP(le16_to_cpu(pneg_ctxt->DataLength) + sizeof(struct smb2_neg_context), 8) * 8; } static void build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt) { pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE; pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN); /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */ pneg_ctxt->Name[0] = 0x93; pneg_ctxt->Name[1] = 0xAD; pneg_ctxt->Name[2] = 0x25; pneg_ctxt->Name[3] = 0x50; pneg_ctxt->Name[4] = 0x9C; pneg_ctxt->Name[5] = 0xB4; pneg_ctxt->Name[6] = 0x11; pneg_ctxt->Name[7] = 0xE7; pneg_ctxt->Name[8] = 0xB4; pneg_ctxt->Name[9] = 0x23; pneg_ctxt->Name[10] = 0x83; pneg_ctxt->Name[11] = 0xDE; pneg_ctxt->Name[12] = 0x96; pneg_ctxt->Name[13] = 0x8B; pneg_ctxt->Name[14] = 0xCD; pneg_ctxt->Name[15] = 0x7C; } static void assemble_neg_contexts(struct smb2_negotiate_req *req, struct TCP_Server_Info *server, unsigned int *total_len) { char *pneg_ctxt; unsigned int ctxt_len; if (*total_len > 200) { /* In case length corrupted don't want to overrun smb buffer */ cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n"); return; } /* * round up total_len of fixed part of SMB3 negotiate request to 8 * byte boundary before adding negotiate contexts */ *total_len = roundup(*total_len, 8); pneg_ctxt = (*total_len) + (char *)req; req->NegotiateContextOffset = cpu_to_le32(*total_len); build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt); ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8; *total_len += ctxt_len; pneg_ctxt += ctxt_len; build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt); ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8; *total_len += ctxt_len; pneg_ctxt += ctxt_len; if (server->compress_algorithm) { build_compression_ctxt((struct smb2_compression_capabilities_context *) pneg_ctxt); ctxt_len = DIV_ROUND_UP( sizeof(struct smb2_compression_capabilities_context), 8) * 8; *total_len += ctxt_len; pneg_ctxt += ctxt_len; req->NegotiateContextCount = cpu_to_le16(5); } else req->NegotiateContextCount = cpu_to_le16(4); ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt, server->hostname); *total_len += ctxt_len; pneg_ctxt += ctxt_len; build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt); *total_len += sizeof(struct smb2_posix_neg_context); } static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt) { unsigned int len = le16_to_cpu(ctxt->DataLength); /* If invalid preauth context warn but use what we requested, SHA-512 */ if (len < MIN_PREAUTH_CTXT_DATA_LEN) { printk_once(KERN_WARNING "server sent bad preauth context\n"); return; } if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1) printk_once(KERN_WARNING "illegal SMB3 hash algorithm count\n"); if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512) printk_once(KERN_WARNING "unknown SMB3 hash algorithm\n"); } static void decode_compress_ctx(struct TCP_Server_Info *server, struct smb2_compression_capabilities_context *ctxt) { unsigned int len = le16_to_cpu(ctxt->DataLength); /* sizeof compress context is a one element compression capbility struct */ if (len < 10) { printk_once(KERN_WARNING "server sent bad compression cntxt\n"); return; } if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) { printk_once(KERN_WARNING "illegal SMB3 compress algorithm count\n"); return; } if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) { printk_once(KERN_WARNING "unknown compression algorithm\n"); return; } server->compress_algorithm = ctxt->CompressionAlgorithms[0]; } static int decode_encrypt_ctx(struct TCP_Server_Info *server, struct smb2_encryption_neg_context *ctxt) { unsigned int len = le16_to_cpu(ctxt->DataLength); cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len); if (len < MIN_ENCRYPT_CTXT_DATA_LEN) { printk_once(KERN_WARNING "server sent bad crypto ctxt len\n"); return -EINVAL; } if (le16_to_cpu(ctxt->CipherCount) != 1) { printk_once(KERN_WARNING "illegal SMB3.11 cipher count\n"); return -EINVAL; } cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0])); if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) && (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) { printk_once(KERN_WARNING "invalid SMB3.11 cipher returned\n"); return -EINVAL; } server->cipher_type = ctxt->Ciphers[0]; server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION; return 0; } static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp, struct TCP_Server_Info *server, unsigned int len_of_smb) { struct smb2_neg_context *pctx; unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset); unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount); unsigned int len_of_ctxts, i; int rc = 0; cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt); if (len_of_smb <= offset) { cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n"); return -EINVAL; } len_of_ctxts = len_of_smb - offset; for (i = 0; i < ctxt_cnt; i++) { int clen; /* check that offset is not beyond end of SMB */ if (len_of_ctxts == 0) break; if (len_of_ctxts < sizeof(struct smb2_neg_context)) break; pctx = (struct smb2_neg_context *)(offset + (char *)rsp); clen = le16_to_cpu(pctx->DataLength); if (clen > len_of_ctxts) break; if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES) decode_preauth_context( (struct smb2_preauth_neg_context *)pctx); else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES) rc = decode_encrypt_ctx(server, (struct smb2_encryption_neg_context *)pctx); else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES) decode_compress_ctx(server, (struct smb2_compression_capabilities_context *)pctx); else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE) server->posix_ext_supported = true; else cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n", le16_to_cpu(pctx->ContextType)); if (rc) break; /* offsets must be 8 byte aligned */ clen = (clen + 7) & ~0x7; offset += clen + sizeof(struct smb2_neg_context); len_of_ctxts -= clen; } return rc; } static struct create_posix * create_posix_buf(umode_t mode) { struct create_posix *buf; buf = kzalloc(sizeof(struct create_posix), GFP_KERNEL); if (!buf) return NULL; buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct create_posix, Mode)); buf->ccontext.DataLength = cpu_to_le32(4); buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct create_posix, Name)); buf->ccontext.NameLength = cpu_to_le16(16); /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */ buf->Name[0] = 0x93; buf->Name[1] = 0xAD; buf->Name[2] = 0x25; buf->Name[3] = 0x50; buf->Name[4] = 0x9C; buf->Name[5] = 0xB4; buf->Name[6] = 0x11; buf->Name[7] = 0xE7; buf->Name[8] = 0xB4; buf->Name[9] = 0x23; buf->Name[10] = 0x83; buf->Name[11] = 0xDE; buf->Name[12] = 0x96; buf->Name[13] = 0x8B; buf->Name[14] = 0xCD; buf->Name[15] = 0x7C; buf->Mode = cpu_to_le32(mode); cifs_dbg(FYI, "mode on posix create 0%o", mode); return buf; } static int add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode) { struct smb2_create_req *req = iov[0].iov_base; unsigned int num = *num_iovec; iov[num].iov_base = create_posix_buf(mode); if (mode == ACL_NO_MODE) cifs_dbg(FYI, "illegal mode\n"); if (iov[num].iov_base == NULL) return -ENOMEM; iov[num].iov_len = sizeof(struct create_posix); if (!req->CreateContextsOffset) req->CreateContextsOffset = cpu_to_le32( sizeof(struct smb2_create_req) + iov[num - 1].iov_len); le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix)); *num_iovec = num + 1; return 0; } /* * * 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 smb_rqst rqst; struct smb2_negotiate_req *req; struct smb2_negotiate_rsp *rsp; struct kvec iov[1]; struct kvec rsp_iov; int rc = 0; int resp_buftype; struct TCP_Server_Info *server = cifs_ses_server(ses); int blob_offset, blob_length; char *security_blob; int flags = CIFS_NEG_OP; unsigned int total_len; cifs_dbg(FYI, "Negotiate protocol\n"); if (!server) { WARN(1, "%s: server is NULL!\n", __func__); return -EIO; } rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len); if (rc) return rc; req->sync_hdr.SessionId = 0; memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE); memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE); if (strcmp(server->vals->version_string, SMB3ANY_VERSION_STRING) == 0) { req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID); req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID); req->DialectCount = cpu_to_le16(2); total_len += 4; } else if (strcmp(server->vals->version_string, SMBDEFAULT_VERSION_STRING) == 0) { req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID); req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID); req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID); req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID); req->DialectCount = cpu_to_le16(4); total_len += 8; } else { /* otherwise send specific dialect */ req->Dialects[0] = cpu_to_le16(server->vals->protocol_id); req->DialectCount = cpu_to_le16(1); total_len += 2; } /* only one of SMB2 signing flags may be set in SMB2 request */ if (ses->sign) req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED); else if (global_secflags & CIFSSEC_MAY_SIGN) req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED); else req->SecurityMode = 0; req->Capabilities = cpu_to_le32(server->vals->req_capabilities); /* ClientGUID must be zero for SMB2.02 dialect */ if (server->vals->protocol_id == SMB20_PROT_ID) memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE); else { memcpy(req->ClientGUID, server->client_guid, SMB2_CLIENT_GUID_SIZE); if ((server->vals->protocol_id == SMB311_PROT_ID) || (strcmp(server->vals->version_string, SMBDEFAULT_VERSION_STRING) == 0)) assemble_neg_contexts(req, server, &total_len); } iov[0].iov_base = (char *)req; iov[0].iov_len = total_len; memset(&rqst, 0, sizeof(struct smb_rqst)); rqst.rq_iov = iov; rqst.rq_nvec = 1; rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov); cifs_small_buf_release(req); rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base; /* * No tcon so can't do * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]); */ if (rc == -EOPNOTSUPP) { cifs_server_dbg(VFS, "Dialect not supported by server. Consider " "specifying vers=1.0 or vers=2.0 on mount for accessing" " older servers\n"); goto neg_exit; } else if (rc != 0) goto neg_exit; if (strcmp(server->vals->version_string, SMB3ANY_VERSION_STRING) == 0) { if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) { cifs_server_dbg(VFS, "SMB2 dialect returned but not requested\n"); return -EIO; } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) { cifs_server_dbg(VFS, "SMB2.1 dialect returned but not requested\n"); return -EIO; } } else if (strcmp(server->vals->version_string, SMBDEFAULT_VERSION_STRING) == 0) { if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) { cifs_server_dbg(VFS, "SMB2 dialect returned but not requested\n"); return -EIO; } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) { /* ops set to 3.0 by default for default so update */ server->ops = &smb21_operations; server->vals = &smb21_values; } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) { server->ops = &smb311_operations; server->vals = &smb311_values; } } else if (le16_to_cpu(rsp->DialectRevision) != server->vals->protocol_id) { /* if requested single dialect ensure returned dialect matched */ cifs_server_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n", le16_to_cpu(rsp->DialectRevision)); return -EIO; } cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode); 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 if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID)) cifs_dbg(FYI, "negotiated smb3.02 dialect\n"); else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n"); else { cifs_server_dbg(VFS, "Illegal dialect returned by server 0x%x\n", le16_to_cpu(rsp->DialectRevision)); rc = -EIO; goto neg_exit; } server->dialect = le16_to_cpu(rsp->DialectRevision); /* * Keep a copy of the hash after negprot. This hash will be * the starting hash value for all sessions made from this * server. */ memcpy(server->preauth_sha_hash, ses->preauth_sha_hash, SMB2_PREAUTH_HASH_SIZE); /* SMB2 only has an extended negflavor */ server->negflavor = CIFS_NEGFLAVOR_EXTENDED; /* set it to the maximum buffer size value we can send with 1 credit */ server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize), SMB2_MAX_BUFFER_SIZE); server->max_read = le32_to_cpu(rsp->MaxReadSize); server->max_write = le32_to_cpu(rsp->MaxWriteSize); server->sec_mode = le16_to_cpu(rsp->SecurityMode); if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode) cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n", server->sec_mode); 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, (struct smb2_sync_hdr *)rsp); /* * See MS-SMB2 section 2.2.4: if no blob, client picks default which * for us will be * ses->sectype = RawNTLMSSP; * but for time being this is our only auth choice so doesn't matter. * We just found a server which sets blob length to zero expecting raw. */ if (blob_length == 0) { cifs_dbg(FYI, "missing security blob on negprot\n"); server->sec_ntlmssp = true; } rc = cifs_enable_signing(server, ses->sign); if (rc) goto neg_exit; if (blob_length) { rc = decode_negTokenInit(security_blob, blob_length, server); if (rc == 1) rc = 0; else if (rc == 0) rc = -EIO; } if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) { if (rsp->NegotiateContextCount) rc = smb311_decode_neg_context(rsp, server, rsp_iov.iov_len); else cifs_server_dbg(VFS, "Missing expected negotiate contexts\n"); } neg_exit: free_rsp_buf(resp_buftype, rsp); return rc; } int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon) { int rc; struct validate_negotiate_info_req *pneg_inbuf; struct validate_negotiate_info_rsp *pneg_rsp = NULL; u32 rsplen; u32 inbuflen; /* max of 4 dialects */ struct TCP_Server_Info *server = tcon->ses->server; cifs_dbg(FYI, "validate negotiate\n"); /* In SMB3.11 preauth integrity supersedes validate negotiate */ if (server->dialect == SMB311_PROT_ID) return 0; /* * validation ioctl must be signed, so no point sending this if we * can not sign it (ie are not known user). Even if signing is not * required (enabled but not negotiated), in those cases we selectively * sign just this, the first and only signed request on a connection. * Having validation of negotiate info helps reduce attack vectors. */ if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) return 0; /* validation requires signing */ if (tcon->ses->user_name == NULL) { cifs_dbg(FYI, "Can't validate negotiate: null user mount\n"); return 0; /* validation requires signing */ } if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL) cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n"); pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS); if (!pneg_inbuf) return -ENOMEM; pneg_inbuf->Capabilities = cpu_to_le32(server->vals->req_capabilities); memcpy(pneg_inbuf->Guid, server->client_guid, SMB2_CLIENT_GUID_SIZE); if (tcon->ses->sign) pneg_inbuf->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED); else if (global_secflags & CIFSSEC_MAY_SIGN) pneg_inbuf->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED); else pneg_inbuf->SecurityMode = 0; if (strcmp(server->vals->version_string, SMB3ANY_VERSION_STRING) == 0) { pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID); pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID); pneg_inbuf->DialectCount = cpu_to_le16(2); /* structure is big enough for 3 dialects, sending only 2 */ inbuflen = sizeof(*pneg_inbuf) - (2 * sizeof(pneg_inbuf->Dialects[0])); } else if (strcmp(server->vals->version_string, SMBDEFAULT_VERSION_STRING) == 0) { pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID); pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID); pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID); pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID); pneg_inbuf->DialectCount = cpu_to_le16(4); /* structure is big enough for 3 dialects */ inbuflen = sizeof(*pneg_inbuf); } else { /* otherwise specific dialect was requested */ pneg_inbuf->Dialects[0] = cpu_to_le16(server->vals->protocol_id); pneg_inbuf->DialectCount = cpu_to_le16(1); /* structure is big enough for 3 dialects, sending only 1 */ inbuflen = sizeof(*pneg_inbuf) - sizeof(pneg_inbuf->Dialects[0]) * 2; } rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID, FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */, (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize, (char **)&pneg_rsp, &rsplen); if (rc == -EOPNOTSUPP) { /* * Old Windows versions or Netapp SMB server can return * not supported error. Client should accept it. */ cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n"); rc = 0; goto out_free_inbuf; } else if (rc != 0) { cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n", rc); rc = -EIO; goto out_free_inbuf; } rc = -EIO; if (rsplen != sizeof(*pneg_rsp)) { cifs_tcon_dbg(VFS, "invalid protocol negotiate response size: %d\n", rsplen); /* relax check since Mac returns max bufsize allowed on ioctl */ if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp)) goto out_free_rsp; } /* check validate negotiate info response matches what we got earlier */ if (pneg_rsp->Dialect != cpu_to_le16(server->dialect)) goto vneg_out; if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode)) goto vneg_out; /* do not validate server guid because not saved at negprot time yet */ if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND | SMB2_LARGE_FILES) != server->capabilities) goto vneg_out; /* validate negotiate successful */ rc = 0; cifs_dbg(FYI, "validate negotiate info successful\n"); goto out_free_rsp; vneg_out: cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n"); out_free_rsp: kfree(pneg_rsp); out_free_inbuf: kfree(pneg_inbuf); return rc; } enum securityEnum smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested) { switch (requested) { case Kerberos: case RawNTLMSSP: return requested; case NTLMv2: return RawNTLMSSP; case Unspecified: if (server->sec_ntlmssp && (global_secflags & CIFSSEC_MAY_NTLMSSP)) return RawNTLMSSP; if ((server->sec_kerberos || server->sec_mskerberos) && (global_secflags & CIFSSEC_MAY_KRB5)) return Kerberos; /* Fallthrough */ default: return Unspecified; } } struct SMB2_sess_data { unsigned int xid; struct cifs_ses *ses; struct nls_table *nls_cp; void (*func)(struct SMB2_sess_data *); int result; u64 previous_session; /* we will send the SMB in three pieces: * a fixed length beginning part, an optional * SPNEGO blob (which can be zero length), and a * last part which will include the strings * and rest of bcc area. This allows us to avoid * a large buffer 17K allocation */ int buf0_type; struct kvec iov[2]; }; static int SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data) { int rc; struct cifs_ses *ses = sess_data->ses; struct smb2_sess_setup_req *req; struct TCP_Server_Info *server = cifs_ses_server(ses); unsigned int total_len; rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req, &total_len); if (rc) return rc; if (sess_data->ses->binding) { req->sync_hdr.SessionId = sess_data->ses->Suid; req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED; req->PreviousSessionId = 0; req->Flags = SMB2_SESSION_REQ_FLAG_BINDING; } else { /* First session, not a reauthenticate */ req->sync_hdr.SessionId = 0; /* * if reconnect, we need to send previous sess id * otherwise it is 0 */ req->PreviousSessionId = sess_data->previous_session; req->Flags = 0; /* MBZ */ } /* enough to enable echos and oplocks and one max size write */ req->sync_hdr.CreditRequest = cpu_to_le16(130); /* only one of SMB2 signing flags may be set in SMB2 request */ if (server->sign) req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED; else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */ req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED; else req->SecurityMode = 0; #ifdef CONFIG_CIFS_DFS_UPCALL req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS); #else req->Capabilities = 0; #endif /* DFS_UPCALL */ req->Channel = 0; /* MBZ */ sess_data->iov[0].iov_base = (char *)req; /* 1 for pad */ sess_data->iov[0].iov_len = total_len - 1; /* * This variable will be used to clear the buffer * allocated above in case of any error in the calling function. */ sess_data->buf0_type = CIFS_SMALL_BUFFER; return 0; } static void SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data) { free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base); sess_data->buf0_type = CIFS_NO_BUFFER; } static int SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data) { int rc; struct smb_rqst rqst; struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base; struct kvec rsp_iov = { NULL, 0 }; /* 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 */); req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len); memset(&rqst, 0, sizeof(struct smb_rqst)); rqst.rq_iov = sess_data->iov; rqst.rq_nvec = 2; /* BB add code to build os and lm fields */ rc = cifs_send_recv(sess_data->xid, sess_data->ses, &rqst, &sess_data->buf0_type, CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov); cifs_small_buf_release(sess_data->iov[0].iov_base); memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec)); return rc; } static int SMB2_sess_establish_session(struct SMB2_sess_data *sess_data) { int rc = 0; struct cifs_ses *ses = sess_data->ses; struct TCP_Server_Info *server = cifs_ses_server(ses); mutex_lock(&server->srv_mutex); if (server->ops->generate_signingkey) { rc = server->ops->generate_signingkey(ses); if (rc) { cifs_dbg(FYI, "SMB3 session key generation failed\n"); mutex_unlock(&server->srv_mutex); return rc; } } if (!server->session_estab) { server->sequence_number = 0x2; server->session_estab = true; } mutex_unlock(&server->srv_mutex); cifs_dbg(FYI, "SMB2/3 session established successfully\n"); /* keep existing ses state if binding */ if (!ses->binding) { spin_lock(&GlobalMid_Lock); ses->status = CifsGood; ses->need_reconnect = false; spin_unlock(&GlobalMid_Lock); } return rc; } #ifdef CONFIG_CIFS_UPCALL static void SMB2_auth_kerberos(struct SMB2_sess_data *sess_data) { int rc; struct cifs_ses *ses = sess_data->ses; struct cifs_spnego_msg *msg; struct key *spnego_key = NULL; struct smb2_sess_setup_rsp *rsp = NULL; rc = SMB2_sess_alloc_buffer(sess_data); if (rc) goto out; spnego_key = cifs_get_spnego_key(ses); if (IS_ERR(spnego_key)) { rc = PTR_ERR(spnego_key); spnego_key = NULL; goto out; } msg = spnego_key->payload.data[0]; /* * check version field to make sure that cifs.upcall is * sending us a response in an expected form */ if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) { cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d", CIFS_SPNEGO_UPCALL_VERSION, msg->version); rc = -EKEYREJECTED; goto out_put_spnego_key; } /* keep session key if binding */ if (!ses->binding) { ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len, GFP_KERNEL); if (!ses->auth_key.response) { cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory", msg->sesskey_len); rc = -ENOMEM; goto out_put_spnego_key; } ses->auth_key.len = msg->sesskey_len; } sess_data->iov[1].iov_base = msg->data + msg->sesskey_len; sess_data->iov[1].iov_len = msg->secblob_len; rc = SMB2_sess_sendreceive(sess_data); if (rc) goto out_put_spnego_key; rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base; /* keep session id and flags if binding */ if (!ses->binding) { ses->Suid = rsp->sync_hdr.SessionId; ses->session_flags = le16_to_cpu(rsp->SessionFlags); } rc = SMB2_sess_establish_session(sess_data); out_put_spnego_key: key_invalidate(spnego_key); key_put(spnego_key); out: sess_data->result = rc; sess_data->func = NULL; SMB2_sess_free_buffer(sess_data); } #else static void SMB2_auth_kerberos(struct SMB2_sess_data *sess_data) { cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n"); sess_data->result = -EOPNOTSUPP; sess_data->func = NULL; } #endif static void SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data); static void SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data) { int rc; struct cifs_ses *ses = sess_data->ses; struct smb2_sess_setup_rsp *rsp = NULL; char *ntlmssp_blob = NULL; bool use_spnego = false; /* else use raw ntlmssp */ u16 blob_length = 0; /* * If memory allocation is successful, caller of this function * frees it. */ ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL); if (!ses->ntlmssp) { rc = -ENOMEM; goto out_err; } ses->ntlmssp->sesskey_per_smbsess = true; rc = SMB2_sess_alloc_buffer(sess_data); if (rc) goto out_err; ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE), GFP_KERNEL); if (ntlmssp_blob == NULL) { rc = -ENOMEM; goto out; } build_ntlmssp_negotiate_blob(ntlmssp_blob, ses); if (use_spnego) { /* BB eventually need to add this */ cifs_dbg(VFS, "spnego not supported for SMB2 yet\n"); rc = -EOPNOTSUPP; goto out; } else { blob_length = sizeof(struct _NEGOTIATE_MESSAGE); /* with raw NTLMSSP we don't encapsulate in SPNEGO */ } sess_data->iov[1].iov_base = ntlmssp_blob; sess_data->iov[1].iov_len = blob_length; rc = SMB2_sess_sendreceive(sess_data); rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base; /* If true, rc here is expected and not an error */ if (sess_data->buf0_type != CIFS_NO_BUFFER && rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) rc = 0; if (rc) goto out; if (offsetof(struct smb2_sess_setup_rsp, Buffer) != le16_to_cpu(rsp->SecurityBufferOffset)) { cifs_dbg(VFS, "Invalid security buffer offset %d\n", le16_to_cpu(rsp->SecurityBufferOffset)); rc = -EIO; goto out; } rc = decode_ntlmssp_challenge(rsp->Buffer, le16_to_cpu(rsp->SecurityBufferLength), ses); if (rc) goto out; cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n"); /* keep existing ses id and flags if binding */ if (!ses->binding) { ses->Suid = rsp->sync_hdr.SessionId; ses->session_flags = le16_to_cpu(rsp->SessionFlags); } out: kfree(ntlmssp_blob); SMB2_sess_free_buffer(sess_data); if (!rc) { sess_data->result = 0; sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate; return; } out_err: kfree(ses->ntlmssp); ses->ntlmssp = NULL; sess_data->result = rc; sess_data->func = NULL; } static void SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data) { int rc; struct cifs_ses *ses = sess_data->ses; struct smb2_sess_setup_req *req; struct smb2_sess_setup_rsp *rsp = NULL; unsigned char *ntlmssp_blob = NULL; bool use_spnego = false; /* else use raw ntlmssp */ u16 blob_length = 0; rc = SMB2_sess_alloc_buffer(sess_data); if (rc) goto out; req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base; req->sync_hdr.SessionId = ses->Suid; rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses, sess_data->nls_cp); if (rc) { cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc); goto out; } if (use_spnego) { /* BB eventually need to add this */ cifs_dbg(VFS, "spnego not supported for SMB2 yet\n"); rc = -EOPNOTSUPP; goto out; } sess_data->iov[1].iov_base = ntlmssp_blob; sess_data->iov[1].iov_len = blob_length; rc = SMB2_sess_sendreceive(sess_data); if (rc) goto out; rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base; /* keep existing ses id and flags if binding */ if (!ses->binding) { ses->Suid = rsp->sync_hdr.SessionId; ses->session_flags = le16_to_cpu(rsp->SessionFlags); } rc = SMB2_sess_establish_session(sess_data); #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS if (ses->server->dialect < SMB30_PROT_ID) { cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__); /* * The session id is opaque in terms of endianness, so we can't * print it as a long long. we dump it as we got it on the wire */ cifs_dbg(VFS, "Session Id %*ph\n", (int)sizeof(ses->Suid), &ses->Suid); cifs_dbg(VFS, "Session Key %*ph\n", SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response); cifs_dbg(VFS, "Signing Key %*ph\n", SMB3_SIGN_KEY_SIZE, ses->auth_key.response); } #endif out: kfree(ntlmssp_blob); SMB2_sess_free_buffer(sess_data); kfree(ses->ntlmssp); ses->ntlmssp = NULL; sess_data->result = rc; sess_data->func = NULL; } static int SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data) { int type; type = smb2_select_sectype(cifs_ses_server(ses), ses->sectype); cifs_dbg(FYI, "sess setup type %d\n", type); if (type == Unspecified) { cifs_dbg(VFS, "Unable to select appropriate authentication method!"); return -EINVAL; } switch (type) { case Kerberos: sess_data->func = SMB2_auth_kerberos; break; case RawNTLMSSP: sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate; break; default: cifs_dbg(VFS, "secType %d not supported!\n", type); return -EOPNOTSUPP; } return 0; } int SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses, const struct nls_table *nls_cp) { int rc = 0; struct TCP_Server_Info *server = cifs_ses_server(ses); struct SMB2_sess_data *sess_data; cifs_dbg(FYI, "Session Setup\n"); if (!server) { WARN(1, "%s: server is NULL!\n", __func__); return -EIO; } sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL); if (!sess_data) return -ENOMEM; rc = SMB2_select_sec(ses, sess_data); if (rc) goto out; sess_data->xid = xid; sess_data->ses = ses; sess_data->buf0_type = CIFS_NO_BUFFER; sess_data->nls_cp = (struct nls_table *) nls_cp; sess_data->previous_session = ses->Suid; /* * Initialize the session hash with the server one. */ memcpy(ses->preauth_sha_hash, server->preauth_sha_hash, SMB2_PREAUTH_HASH_SIZE); while (sess_data->func) sess_data->func(sess_data); if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign)) cifs_server_dbg(VFS, "signing requested but authenticated as guest\n"); rc = sess_data->result; out: kfree(sess_data); return rc; } int SMB2_logoff(const unsigned int xid, struct cifs_ses *ses) { struct smb_rqst rqst; struct smb2_logoff_req *req; /* response is also trivial struct */ int rc = 0; struct TCP_Server_Info *server; int flags = 0; unsigned int total_len; struct kvec iov[1]; struct kvec rsp_iov; int resp_buf_type; cifs_dbg(FYI, "disconnect session %p\n", ses); if (ses && (ses->server)) server = ses->server; else return -EIO; /* no need to send SMB logoff if uid already closed due to reconnect */ if (ses->need_reconnect) goto smb2_session_already_dead; rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len); if (rc) return rc; /* since no tcon, smb2_init can not do this, so do here */ req->sync_hdr.SessionId = ses->Suid; if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) flags |= CIFS_TRANSFORM_REQ; else if (server->sign) req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED; flags |= CIFS_NO_RSP_BUF; iov[0].iov_base = (char *)req; iov[0].iov_len = total_len; memset(&rqst, 0, sizeof(struct smb_rqst)); rqst.rq_iov = iov; rqst.rq_nvec = 1; rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov); cifs_small_buf_release(req); /* * No tcon so can't do * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]); */ smb2_session_already_dead: 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 */) /* These are similar values to what Windows uses */ static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon) { tcon->max_chunks = 256; tcon->max_bytes_chunk = 1048576; tcon->max_bytes_copy = 16777216; } int SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree, struct cifs_tcon *tcon, const struct nls_table *cp) { struct smb_rqst rqst; struct smb2_tree_connect_req *req; struct smb2_tree_connect_rsp *rsp = NULL; struct kvec iov[2]; struct kvec rsp_iov = { NULL, 0 }; int rc = 0; int resp_buftype; int unc_path_len; __le16 *unc_path = NULL; int flags = 0; unsigned int total_len; struct TCP_Server_Info *server = ses->server; cifs_dbg(FYI, "TCON\n"); if (!server || !tree) return -EIO; 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; } /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */ tcon->tid = 0; atomic_set(&tcon->num_remote_opens, 0); rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req, &total_len); if (rc) { kfree(unc_path); return rc; } if (smb3_encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; iov[0].iov_base = (char *)req; /* 1 for pad */ iov[0].iov_len = total_len - 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 */); req->PathLength = cpu_to_le16(unc_path_len - 2); iov[1].iov_base = unc_path; iov[1].iov_len = unc_path_len; /* * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1 * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1 * (Samba servers don't always set the flag so also check if null user) */ if ((server->dialect == SMB311_PROT_ID) && !smb3_encryption_required(tcon) && !(ses->session_flags & (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) && ((ses->user_name != NULL) || (ses->sectype == Kerberos))) req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED; memset(&rqst, 0, sizeof(struct smb_rqst)); rqst.rq_iov = iov; rqst.rq_nvec = 2; /* Need 64 for max size write so ask for more in case not there yet */ req->sync_hdr.CreditRequest = cpu_to_le16(64); rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov); cifs_small_buf_release(req); rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base; trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc); if (rc != 0) { if (tcon) { cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE); tcon->need_reconnect = true; } goto tcon_error_exit; } switch (rsp->ShareType) { case SMB2_SHARE_TYPE_DISK: cifs_dbg(FYI, "connection to disk share\n"); break; case SMB2_SHARE_TYPE_PIPE: tcon->pipe = true; cifs_dbg(FYI, "connection to pipe share\n"); break; case SMB2_SHARE_TYPE_PRINT: tcon->print = true; cifs_dbg(FYI, "connection to printer\n"); break; default: cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType); rc = -EOPNOTSUPP; goto tcon_error_exit; } tcon->share_flags = le32_to_cpu(rsp->ShareFlags); tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */ tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess); tcon->tidStatus = CifsGood; tcon->need_reconnect = false; tcon->tid = rsp->sync_hdr.TreeId; strlcpy(tcon->treeName, tree, sizeof(tcon->treeName)); if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) && ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0)) cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n"); if (tcon->seal && !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)) cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n"); init_copy_chunk_defaults(tcon); if (server->ops->validate_negotiate) rc = server->ops->validate_negotiate(xid, tcon); tcon_exit: free_rsp_buf(resp_buftype, rsp); kfree(unc_path); return rc; tcon_error_exit: if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) { cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree); } goto tcon_exit; } int SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon) { struct smb_rqst rqst; struct smb2_tree_disconnect_req *req; /* response is trivial */ int rc = 0; struct cifs_ses *ses = tcon->ses; int flags = 0; unsigned int total_len; struct kvec iov[1]; struct kvec rsp_iov; int resp_buf_type; cifs_dbg(FYI, "Tree Disconnect\n"); if (!ses || !(ses->server)) return -EIO; if ((tcon->need_reconnect) || (tcon->ses->need_reconnect)) return 0; close_shroot_lease(&tcon->crfid); rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req, &total_len); if (rc) return rc; if (smb3_encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; flags |= CIFS_NO_RSP_BUF; iov[0].iov_base = (char *)req; iov[0].iov_len = total_len; memset(&rqst, 0, sizeof(struct smb_rqst)); rqst.rq_iov = iov; rqst.rq_nvec = 1; rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov); cifs_small_buf_release(req); if (rc) cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE); return rc; } static struct create_durable * create_durable_buf(void) { struct create_durable *buf; buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL); if (!buf) return NULL; buf->ccontext.DataOffset = cpu_to_le16(offsetof (struct create_durable, Data)); buf->ccontext.DataLength = cpu_to_le32(16); buf->ccontext.NameOffset = cpu_to_le16(offsetof (struct create_durable, Name)); buf->ccontext.NameLength = cpu_to_le16(4); /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */ buf->Name[0] = 'D'; buf->Name[1] = 'H'; buf->Name[2] = 'n'; buf->Name[3] = 'Q'; return buf; } static struct create_durable * create_reconnect_durable_buf(struct cifs_fid *fid) { struct create_durable *buf; buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL); if (!buf) return NULL; buf->ccontext.DataOffset = cpu_to_le16(offsetof (struct create_durable, Data)); buf->ccontext.DataLength = cpu_to_le32(16); buf->ccontext.NameOffset = cpu_to_le16(offsetof (struct create_durable, Name)); buf->ccontext.NameLength = cpu_to_le16(4); buf->Data.Fid.PersistentFileId = fid->persistent_fid; buf->Data.Fid.VolatileFileId = fid->volatile_fid; /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */ buf->Name[0] = 'D'; buf->Name[1] = 'H'; buf->Name[2] = 'n'; buf->Name[3] = 'C'; return buf; } static void parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf) { struct create_on_disk_id *pdisk_id = (struct create_on_disk_id *)cc; cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n", pdisk_id->DiskFileId, pdisk_id->VolumeId); buf->IndexNumber = pdisk_id->DiskFileId; } static void parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info, struct create_posix_rsp *posix) { int sid_len; u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset); u8 *end = beg + le32_to_cpu(cc->DataLength); u8 *sid; memset(posix, 0, sizeof(*posix)); posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0)); posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4)); posix->mode = le32_to_cpu(*(__le32 *)(beg + 8)); sid = beg + 12; sid_len = posix_info_sid_size(sid, end); if (sid_len < 0) { cifs_dbg(VFS, "bad owner sid in posix create response\n"); return; } memcpy(&posix->owner, sid, sid_len); sid = sid + sid_len; sid_len = posix_info_sid_size(sid, end); if (sid_len < 0) { cifs_dbg(VFS, "bad group sid in posix create response\n"); return; } memcpy(&posix->group, sid, sid_len); cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n", posix->nlink, posix->mode, posix->reparse_tag); } void smb2_parse_contexts(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp, unsigned int *epoch, char *lease_key, __u8 *oplock, struct smb2_file_all_info *buf, struct create_posix_rsp *posix) { char *data_offset; struct create_context *cc; unsigned int next; unsigned int remaining; char *name; const char smb3_create_tag_posix[] = {0x93, 0xAD, 0x25, 0x50, 0x9C, 0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83, 0xDE, 0x96, 0x8B, 0xCD, 0x7C}; *oplock = 0; data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset); remaining = le32_to_cpu(rsp->CreateContextsLength); cc = (struct create_context *)data_offset; /* Initialize inode number to 0 in case no valid data in qfid context */ if (buf) buf->IndexNumber = 0; while (remaining >= sizeof(struct create_context)) { name = le16_to_cpu(cc->NameOffset) + (char *)cc; if (le16_to_cpu(cc->NameLength) == 4 && strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0) *oplock = server->ops->parse_lease_buf(cc, epoch, lease_key); else if (buf && (le16_to_cpu(cc->NameLength) == 4) && strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0) parse_query_id_ctxt(cc, buf); else if ((le16_to_cpu(cc->NameLength) == 16)) { if (posix && memcmp(name, smb3_create_tag_posix, 16) == 0) parse_posix_ctxt(cc, buf, posix); } /* else { cifs_dbg(FYI, "Context not matched with len %d\n", le16_to_cpu(cc->NameLength)); cifs_dump_mem("Cctxt name: ", name, 4); } */ next = le32_to_cpu(cc->Next); if (!next) break; remaining -= next; cc = (struct create_context *)((char *)cc + next); } if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE) *oplock = rsp->OplockLevel; return; } static int add_lease_context(struct TCP_Server_Info *server, struct kvec *iov, unsigned int *num_iovec, u8 *lease_key, __u8 *oplock) { struct smb2_create_req *req = iov[0].iov_base; unsigned int num = *num_iovec; iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock); if (iov[num].iov_base == NULL) return -ENOMEM; iov[num].iov_len = server->vals->create_lease_size; req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE; if (!req->CreateContextsOffset) req->CreateContextsOffset = cpu_to_le32( sizeof(struct smb2_create_req) + iov[num - 1].iov_len); le32_add_cpu(&req->CreateContextsLength, server->vals->create_lease_size); *num_iovec = num + 1; return 0; } static struct create_durable_v2 * create_durable_v2_buf(struct cifs_open_parms *oparms) { struct cifs_fid *pfid = oparms->fid; struct create_durable_v2 *buf; buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL); if (!buf) return NULL; buf->ccontext.DataOffset = cpu_to_le16(offsetof (struct create_durable_v2, dcontext)); buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2)); buf->ccontext.NameOffset = cpu_to_le16(offsetof (struct create_durable_v2, Name)); buf->ccontext.NameLength = cpu_to_le16(4); /* * NB: Handle timeout defaults to 0, which allows server to choose * (most servers default to 120 seconds) and most clients default to 0. * This can be overridden at mount ("handletimeout=") if the user wants * a different persistent (or resilient) handle timeout for all opens * opens on a particular SMB3 mount. */ buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout); buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT); generate_random_uuid(buf->dcontext.CreateGuid); memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16); /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */ buf->Name[0] = 'D'; buf->Name[1] = 'H'; buf->Name[2] = '2'; buf->Name[3] = 'Q'; return buf; } static struct create_durable_handle_reconnect_v2 * create_reconnect_durable_v2_buf(struct cifs_fid *fid) { struct create_durable_handle_reconnect_v2 *buf; buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2), GFP_KERNEL); if (!buf) return NULL; buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2, dcontext)); buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_reconnect_context_v2)); buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2, Name)); buf->ccontext.NameLength = cpu_to_le16(4); buf->dcontext.Fid.PersistentFileId = fid->persistent_fid; buf->dcontext.Fid.VolatileFileId = fid->volatile_fid; buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT); memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16); /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */ buf->Name[0] = 'D'; buf->Name[1] = 'H'; buf->Name[2] = '2'; buf->Name[3] = 'C'; return buf; } static int add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec, struct cifs_open_parms *oparms) { struct smb2_create_req *req = iov[0].iov_base; unsigned int num = *num_iovec; iov[num].iov_base = create_durable_v2_buf(oparms); if (iov[num].iov_base == NULL) return -ENOMEM; iov[num].iov_len = sizeof(struct create_durable_v2); if (!req->CreateContextsOffset) req->CreateContextsOffset = cpu_to_le32(sizeof(struct smb2_create_req) + iov[1].iov_len); le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2)); *num_iovec = num + 1; return 0; } static int add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec, struct cifs_open_parms *oparms) { struct smb2_create_req *req = iov[0].iov_base; unsigned int num = *num_iovec; /* indicate that we don't need to relock the file */ oparms->reconnect = false; iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid); if (iov[num].iov_base == NULL) return -ENOMEM; iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2); if (!req->CreateContextsOffset) req->CreateContextsOffset = cpu_to_le32(sizeof(struct smb2_create_req) + iov[1].iov_len); le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_handle_reconnect_v2)); *num_iovec = num + 1; return 0; } static int add_durable_context(struct kvec *iov, unsigned int *num_iovec, struct cifs_open_parms *oparms, bool use_persistent) { struct smb2_create_req *req = iov[0].iov_base; unsigned int num = *num_iovec; if (use_persistent) { if (oparms->reconnect) return add_durable_reconnect_v2_context(iov, num_iovec, oparms); else return add_durable_v2_context(iov, num_iovec, oparms); } if (oparms->reconnect) { iov[num].iov_base = create_reconnect_durable_buf(oparms->fid); /* indicate that we don't need to relock the file */ oparms->reconnect = false; } else iov[num].iov_base = create_durable_buf(); if (iov[num].iov_base == NULL) return -ENOMEM; iov[num].iov_len = sizeof(struct create_durable); if (!req->CreateContextsOffset) req->CreateContextsOffset = cpu_to_le32(sizeof(struct smb2_create_req) + iov[1].iov_len); le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable)); *num_iovec = num + 1; return 0; } /* See MS-SMB2 2.2.13.2.7 */ static struct crt_twarp_ctxt * create_twarp_buf(__u64 timewarp) { struct crt_twarp_ctxt *buf; buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL); if (!buf) return NULL; buf->ccontext.DataOffset = cpu_to_le16(offsetof (struct crt_twarp_ctxt, Timestamp)); buf->ccontext.DataLength = cpu_to_le32(8); buf->ccontext.NameOffset = cpu_to_le16(offsetof (struct crt_twarp_ctxt, Name)); buf->ccontext.NameLength = cpu_to_le16(4); /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */ buf->Name[0] = 'T'; buf->Name[1] = 'W'; buf->Name[2] = 'r'; buf->Name[3] = 'p'; buf->Timestamp = cpu_to_le64(timewarp); return buf; } /* See MS-SMB2 2.2.13.2.7 */ static int add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp) { struct smb2_create_req *req = iov[0].iov_base; unsigned int num = *num_iovec; iov[num].iov_base = create_twarp_buf(timewarp); if (iov[num].iov_base == NULL) return -ENOMEM; iov[num].iov_len = sizeof(struct crt_twarp_ctxt); if (!req->CreateContextsOffset) req->CreateContextsOffset = cpu_to_le32( sizeof(struct smb2_create_req) + iov[num - 1].iov_len); le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt)); *num_iovec = num + 1; return 0; } /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */ static struct crt_sd_ctxt * create_sd_buf(umode_t mode, unsigned int *len) { struct crt_sd_ctxt *buf; struct cifs_ace *pace; unsigned int sdlen, acelen; *len = roundup(sizeof(struct crt_sd_ctxt) + sizeof(struct cifs_ace) * 2, 8); buf = kzalloc(*len, GFP_KERNEL); if (buf == NULL) return buf; sdlen = sizeof(struct smb3_sd) + sizeof(struct smb3_acl) + 2 * sizeof(struct cifs_ace); buf->ccontext.DataOffset = cpu_to_le16(offsetof (struct crt_sd_ctxt, sd)); buf->ccontext.DataLength = cpu_to_le32(sdlen); buf->ccontext.NameOffset = cpu_to_le16(offsetof (struct crt_sd_ctxt, Name)); buf->ccontext.NameLength = cpu_to_le16(4); /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */ buf->Name[0] = 'S'; buf->Name[1] = 'e'; buf->Name[2] = 'c'; buf->Name[3] = 'D'; buf->sd.Revision = 1; /* Must be one see MS-DTYP 2.4.6 */ /* * ACL is "self relative" ie ACL is stored in contiguous block of memory * and "DP" ie the DACL is present */ buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP); /* offset owner, group and Sbz1 and SACL are all zero */ buf->sd.OffsetDacl = cpu_to_le32(sizeof(struct smb3_sd)); buf->acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */ /* create one ACE to hold the mode embedded in reserved special SID */ pace = (struct cifs_ace *)(sizeof(struct crt_sd_ctxt) + (char *)buf); acelen = setup_special_mode_ACE(pace, (__u64)mode); /* and one more ACE to allow access for authenticated users */ pace = (struct cifs_ace *)(acelen + (sizeof(struct crt_sd_ctxt) + (char *)buf)); acelen += setup_authusers_ACE(pace); buf->acl.AclSize = cpu_to_le16(sizeof(struct cifs_acl) + acelen); buf->acl.AceCount = cpu_to_le16(2); return buf; } static int add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode) { struct smb2_create_req *req = iov[0].iov_base; unsigned int num = *num_iovec; unsigned int len = 0; iov[num].iov_base = create_sd_buf(mode, &len); if (iov[num].iov_base == NULL) return -ENOMEM; iov[num].iov_len = len; if (!req->CreateContextsOffset) req->CreateContextsOffset = cpu_to_le32( sizeof(struct smb2_create_req) + iov[num - 1].iov_len); le32_add_cpu(&req->CreateContextsLength, len); *num_iovec = num + 1; return 0; } static struct crt_query_id_ctxt * create_query_id_buf(void) { struct crt_query_id_ctxt *buf; buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL); if (!buf) return NULL; buf->ccontext.DataOffset = cpu_to_le16(0); buf->ccontext.DataLength = cpu_to_le32(0); buf->ccontext.NameOffset = cpu_to_le16(offsetof (struct crt_query_id_ctxt, Name)); buf->ccontext.NameLength = cpu_to_le16(4); /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */ buf->Name[0] = 'Q'; buf->Name[1] = 'F'; buf->Name[2] = 'i'; buf->Name[3] = 'd'; return buf; } /* See MS-SMB2 2.2.13.2.9 */ static int add_query_id_context(struct kvec *iov, unsigned int *num_iovec) { struct smb2_create_req *req = iov[0].iov_base; unsigned int num = *num_iovec; iov[num].iov_base = create_query_id_buf(); if (iov[num].iov_base == NULL) return -ENOMEM; iov[num].iov_len = sizeof(struct crt_query_id_ctxt); if (!req->CreateContextsOffset) req->CreateContextsOffset = cpu_to_le32( sizeof(struct smb2_create_req) + iov[num - 1].iov_len); le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_query_id_ctxt)); *num_iovec = num + 1; return 0; } static int alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len, const char *treename, const __le16 *path) { int treename_len, path_len; struct nls_table *cp; const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)}; /* * skip leading "\\" */ treename_len = strlen(treename); if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\')) return -EINVAL; treename += 2; treename_len -= 2; path_len = UniStrnlen((wchar_t *)path, PATH_MAX); /* * make room for one path separator between the treename and * path */ *out_len = treename_len + 1 + path_len; /* * final path needs to be null-terminated UTF16 with a * size aligned to 8 */ *out_size = roundup((*out_len+1)*2, 8); *out_path = kzalloc(*out_size, GFP_KERNEL); if (!*out_path) return -ENOMEM; cp = load_nls_default(); cifs_strtoUTF16(*out_path, treename, treename_len, cp); UniStrcat(*out_path, sep); UniStrcat(*out_path, path); unload_nls(cp); return 0; } int smb311_posix_mkdir(const unsigned int xid, struct inode *inode, umode_t mode, struct cifs_tcon *tcon, const char *full_path, struct cifs_sb_info *cifs_sb) { struct smb_rqst rqst; struct smb2_create_req *req; struct smb2_create_rsp *rsp = NULL; struct cifs_ses *ses = tcon->ses; struct kvec iov[3]; /* make sure at least one for each open context */ struct kvec rsp_iov = {NULL, 0}; int resp_buftype; int uni_path_len; __le16 *copy_path = NULL; int copy_size; int rc = 0; unsigned int n_iov = 2; __u32 file_attributes = 0; char *pc_buf = NULL; int flags = 0; unsigned int total_len; __le16 *utf16_path = NULL; cifs_dbg(FYI, "mkdir\n"); /* resource #1: path allocation */ utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb); if (!utf16_path) return -ENOMEM; if (!ses || !(ses->server)) { rc = -EIO; goto err_free_path; } /* resource #2: request */ rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len); if (rc) goto err_free_path; if (smb3_encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; req->ImpersonationLevel = IL_IMPERSONATION; req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES); /* 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(FILE_CREATE); req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE); iov[0].iov_base = (char *)req; /* -1 since last byte is buf[0] which is sent below (path) */ iov[0].iov_len = total_len - 1; req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)); /* [MS-SMB2] 2.2.13 NameOffset: * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of * the SMB2 header, the file name includes a prefix that will * be processed during DFS name normalization as specified in * section 3.3.5.9. Otherwise, the file name is relative to * the share that is identified by the TreeId in the SMB2 * header. */ if (tcon->share_flags & SHI1005_FLAGS_DFS) { int name_len; req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS; rc = alloc_path_with_tree_prefix(©_path, ©_size, &name_len, tcon->treeName, utf16_path); if (rc) goto err_free_req; req->NameLength = cpu_to_le16(name_len * 2); uni_path_len = copy_size; /* free before overwriting resource */ kfree(utf16_path); utf16_path = copy_path; } else { uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2; /* MUST set path len (NameLength) to 0 opening root of share */ req->NameLength = cpu_to_le16(uni_path_len - 2); if (uni_path_len % 8 != 0) { copy_size = roundup(uni_path_len, 8); copy_path = kzalloc(copy_size, GFP_KERNEL); if (!copy_path) { rc = -ENOMEM; goto err_free_req; } memcpy((char *)copy_path, (const char *)utf16_path, uni_path_len); uni_path_len = copy_size; /* free before overwriting resource */ kfree(utf16_path); utf16_path = copy_path; } } iov[1].iov_len = uni_path_len; iov[1].iov_base = utf16_path; req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE; if (tcon->posix_extensions) { /* resource #3: posix buf */ rc = add_posix_context(iov, &n_iov, mode); if (rc) goto err_free_req; pc_buf = iov[n_iov-1].iov_base; } memset(&rqst, 0, sizeof(struct smb_rqst)); rqst.rq_iov = iov; rqst.rq_nvec = n_iov; /* no need to inc num_remote_opens because we close it just below */ trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE, FILE_WRITE_ATTRIBUTES); /* resource #4: response buffer */ rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov); if (rc) { cifs_stats_fail_inc(tcon, SMB2_CREATE_HE); trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE, FILE_WRITE_ATTRIBUTES, rc); goto err_free_rsp_buf; } rsp = (struct smb2_create_rsp *)rsp_iov.iov_base; trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid, CREATE_NOT_FILE, FILE_WRITE_ATTRIBUTES); SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId); /* Eventually save off posix specific response info and timestaps */ err_free_rsp_buf: free_rsp_buf(resp_buftype, rsp); kfree(pc_buf); err_free_req: cifs_small_buf_release(req); err_free_path: kfree(utf16_path); return rc; } int SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, __u8 *oplock, struct cifs_open_parms *oparms, __le16 *path) { struct TCP_Server_Info *server = tcon->ses->server; struct smb2_create_req *req; unsigned int n_iov = 2; __u32 file_attributes = 0; int copy_size; int uni_path_len; unsigned int total_len; struct kvec *iov = rqst->rq_iov; __le16 *copy_path; int rc; rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len); if (rc) return rc; iov[0].iov_base = (char *)req; /* -1 since last byte is buf[0] which is sent below (path) */ iov[0].iov_len = total_len - 1; if (oparms->create_options & CREATE_OPTION_READONLY) file_attributes |= ATTR_READONLY; if (oparms->create_options & CREATE_OPTION_SPECIAL) file_attributes |= ATTR_SYSTEM; req->ImpersonationLevel = IL_IMPERSONATION; req->DesiredAccess = cpu_to_le32(oparms->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(oparms->disposition); req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK); req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)); /* [MS-SMB2] 2.2.13 NameOffset: * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of * the SMB2 header, the file name includes a prefix that will * be processed during DFS name normalization as specified in * section 3.3.5.9. Otherwise, the file name is relative to * the share that is identified by the TreeId in the SMB2 * header. */ if (tcon->share_flags & SHI1005_FLAGS_DFS) { int name_len; req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS; rc = alloc_path_with_tree_prefix(©_path, ©_size, &name_len, tcon->treeName, path); if (rc) return rc; req->NameLength = cpu_to_le16(name_len * 2); uni_path_len = copy_size; path = copy_path; } else { uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2; /* MUST set path len (NameLength) to 0 opening root of share */ req->NameLength = cpu_to_le16(uni_path_len - 2); copy_size = uni_path_len; if (copy_size % 8 != 0) copy_size = roundup(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; if ((!server->oplocks) || (tcon->no_lease)) *oplock = SMB2_OPLOCK_LEVEL_NONE; if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) || *oplock == SMB2_OPLOCK_LEVEL_NONE) req->RequestedOplockLevel = *oplock; else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) && (oparms->create_options & CREATE_NOT_FILE)) req->RequestedOplockLevel = *oplock; /* no srv lease support */ else { rc = add_lease_context(server, iov, &n_iov, oparms->fid->lease_key, oplock); if (rc) return rc; } if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) { /* need to set Next field of lease context if we request it */ if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) { struct create_context *ccontext = (struct create_context *)iov[n_iov-1].iov_base; ccontext->Next = cpu_to_le32(server->vals->create_lease_size); } rc = add_durable_context(iov, &n_iov, oparms, tcon->use_persistent); if (rc) return rc; } if (tcon->posix_extensions) { if (n_iov > 2) { struct create_context *ccontext = (struct create_context *)iov[n_iov-1].iov_base; ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len); } rc = add_posix_context(iov, &n_iov, oparms->mode); if (rc) return rc; } if (tcon->snapshot_time) { cifs_dbg(FYI, "adding snapshot context\n"); if (n_iov > 2) { struct create_context *ccontext = (struct create_context *)iov[n_iov-1].iov_base; ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len); } rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time); if (rc) return rc; } if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb) && (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) && (oparms->mode != ACL_NO_MODE)) { if (n_iov > 2) { struct create_context *ccontext = (struct create_context *)iov[n_iov-1].iov_base; ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len); } cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode); rc = add_sd_context(iov, &n_iov, oparms->mode); if (rc) return rc; } if (n_iov > 2) { struct create_context *ccontext = (struct create_context *)iov[n_iov-1].iov_base; ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len); } add_query_id_context(iov, &n_iov); rqst->rq_nvec = n_iov; return 0; } /* rq_iov[0] is the request and is released by cifs_small_buf_release(). * All other vectors are freed by kfree(). */ void SMB2_open_free(struct smb_rqst *rqst) { int i; if (rqst && rqst->rq_iov) { cifs_small_buf_release(rqst->rq_iov[0].iov_base); for (i = 1; i < rqst->rq_nvec; i++) if (rqst->rq_iov[i].iov_base != smb2_padding) kfree(rqst->rq_iov[i].iov_base); } } int SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path, __u8 *oplock, struct smb2_file_all_info *buf, struct create_posix_rsp *posix, struct kvec *err_iov, int *buftype) { struct smb_rqst rqst; struct smb2_create_rsp *rsp = NULL; struct TCP_Server_Info *server; struct cifs_tcon *tcon = oparms->tcon; struct cifs_ses *ses = tcon->ses; struct kvec iov[SMB2_CREATE_IOV_SIZE]; struct kvec rsp_iov = {NULL, 0}; int resp_buftype = CIFS_NO_BUFFER; int rc = 0; int flags = 0; cifs_dbg(FYI, "create/open\n"); if (ses && (ses->server)) server = ses->server; else return -EIO; if (smb3_encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; memset(&rqst, 0, sizeof(struct smb_rqst)); memset(&iov, 0, sizeof(iov)); rqst.rq_iov = iov; rqst.rq_nvec = SMB2_CREATE_IOV_SIZE; rc = SMB2_open_init(tcon, &rqst, oplock, oparms, path); if (rc) goto creat_exit; trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid, oparms->create_options, oparms->desired_access); rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov); rsp = (struct smb2_create_rsp *)rsp_iov.iov_base; if (rc != 0) { cifs_stats_fail_inc(tcon, SMB2_CREATE_HE); if (err_iov && rsp) { *err_iov = rsp_iov; *buftype = resp_buftype; resp_buftype = CIFS_NO_BUFFER; rsp = NULL; } trace_smb3_open_err(xid, tcon->tid, ses->Suid, oparms->create_options, oparms->desired_access, rc); if (rc == -EREMCHG) { printk_once(KERN_WARNING "server share %s deleted\n", tcon->treeName); tcon->need_reconnect = true; } goto creat_exit; } else trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid, oparms->create_options, oparms->desired_access); atomic_inc(&tcon->num_remote_opens); oparms->fid->persistent_fid = rsp->PersistentFileId; oparms->fid->volatile_fid = rsp->VolatileFileId; oparms->fid->access = oparms->desired_access; #ifdef CONFIG_CIFS_DEBUG2 oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId); #endif /* CIFS_DEBUG2 */ 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; } smb2_parse_contexts(server, rsp, &oparms->fid->epoch, oparms->fid->lease_key, oplock, buf, posix); creat_exit: SMB2_open_free(&rqst); free_rsp_buf(resp_buftype, rsp); return rc; } int SMB2_ioctl_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, u64 persistent_fid, u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data, u32 indatalen, __u32 max_response_size) { struct smb2_ioctl_req *req; struct kvec *iov = rqst->rq_iov; unsigned int total_len; int rc; char *in_data_buf; rc = smb2_ioctl_req_init(opcode, tcon, (void **) &req, &total_len); if (rc) return rc; if (indatalen) { /* * indatalen is usually small at a couple of bytes max, so * just allocate through generic pool */ in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS); if (!in_data_buf) { cifs_small_buf_release(req); return -ENOMEM; } } req->CtlCode = cpu_to_le32(opcode); req->PersistentFileId = persistent_fid; req->VolatileFileId = volatile_fid; iov[0].iov_base = (char *)req; /* * If no input data, the size of ioctl struct in * protocol spec still includes a 1 byte data buffer, * but if input data passed to ioctl, we do not * want to double count this, so we do not send * the dummy one byte of data in iovec[0] if sending * input data (in iovec[1]). */ if (indatalen) { req->InputCount = cpu_to_le32(indatalen); /* do not set InputOffset if no input data */ req->InputOffset = cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer)); rqst->rq_nvec = 2; iov[0].iov_len = total_len - 1; iov[1].iov_base = in_data_buf; iov[1].iov_len = indatalen; } else { rqst->rq_nvec = 1; iov[0].iov_len = total_len; } req->OutputOffset = 0; req->OutputCount = 0; /* MBZ */ /* * In most cases max_response_size is set to 16K (CIFSMaxBufSize) * We Could increase default MaxOutputResponse, but that could require * more credits. Windows typically sets this smaller, but for some * ioctls it may be useful to allow server to send more. No point * limiting what the server can send as long as fits in one credit * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want * to increase this limit up in the future. * Note that for snapshot queries that servers like Azure expect that * the first query be minimal size (and just used to get the number/size * of previous versions) so response size must be specified as EXACTLY * sizeof(struct snapshot_array) which is 16 when rounded up to multiple * of eight bytes. Currently that is the only case where we set max * response size smaller. */ req->MaxOutputResponse = cpu_to_le32(max_response_size); if (is_fsctl) req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL); else req->Flags = 0; /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */ if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED; return 0; } void SMB2_ioctl_free(struct smb_rqst *rqst) { int i; if (rqst && rqst->rq_iov) { cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */ for (i = 1; i < rqst->rq_nvec; i++) if (rqst->rq_iov[i].iov_base != smb2_padding) kfree(rqst->rq_iov[i].iov_base); } } /* * SMB2 IOCTL is used for both IOCTLs and FSCTLs */ int SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data, u32 indatalen, u32 max_out_data_len, char **out_data, u32 *plen /* returned data len */) { struct smb_rqst rqst; struct smb2_ioctl_rsp *rsp = NULL; struct cifs_ses *ses; struct kvec iov[SMB2_IOCTL_IOV_SIZE]; struct kvec rsp_iov = {NULL, 0}; int resp_buftype = CIFS_NO_BUFFER; int rc = 0; int flags = 0; struct TCP_Server_Info *server; cifs_dbg(FYI, "SMB2 IOCTL\n"); if (out_data != NULL) *out_data = NULL; /* zero out returned data len, in case of error */ if (plen) *plen = 0; if (tcon) ses = tcon->ses; else return -EIO; if (!ses) return -EIO; server = ses->server; if (!server) return -EIO; if (smb3_encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; memset(&rqst, 0, sizeof(struct smb_rqst)); memset(&iov, 0, sizeof(iov)); rqst.rq_iov = iov; rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE; rc = SMB2_ioctl_init(tcon, &rqst, persistent_fid, volatile_fid, opcode, is_fsctl, in_data, indatalen, max_out_data_len); if (rc) goto ioctl_exit; rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov); rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base; if (rc != 0) trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid, ses->Suid, 0, opcode, rc); if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) { cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE); goto ioctl_exit; } else if (rc == -EINVAL) { if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) && (opcode != FSCTL_SRV_COPYCHUNK)) { cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE); goto ioctl_exit; } } else if (rc == -E2BIG) { if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) { cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE); goto ioctl_exit; } } /* check if caller wants to look at return data or just return rc */ if ((plen == NULL) || (out_data == NULL)) goto ioctl_exit; *plen = le32_to_cpu(rsp->OutputCount); /* We check for obvious errors in the output buffer length and offset */ if (*plen == 0) goto ioctl_exit; /* server returned no data */ else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) { cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen); *plen = 0; rc = -EIO; goto ioctl_exit; } if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) { cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen, le32_to_cpu(rsp->OutputOffset)); *plen = 0; rc = -EIO; goto ioctl_exit; } *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset), *plen, GFP_KERNEL); if (*out_data == NULL) { rc = -ENOMEM; goto ioctl_exit; } ioctl_exit: SMB2_ioctl_free(&rqst); free_rsp_buf(resp_buftype, rsp); return rc; } /* * Individual callers to ioctl worker function follow */ int SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid) { int rc; struct compress_ioctl fsctl_input; char *ret_data = NULL; fsctl_input.CompressionState = cpu_to_le16(COMPRESSION_FORMAT_DEFAULT); rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid, FSCTL_SET_COMPRESSION, true /* is_fsctl */, (char *)&fsctl_input /* data input */, 2 /* in data len */, CIFSMaxBufSize /* max out data */, &ret_data /* out data */, NULL); cifs_dbg(FYI, "set compression rc %d\n", rc); return rc; } int SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, u64 persistent_fid, u64 volatile_fid, bool query_attrs) { struct smb2_close_req *req; struct kvec *iov = rqst->rq_iov; unsigned int total_len; int rc; rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len); if (rc) return rc; req->PersistentFileId = persistent_fid; req->VolatileFileId = volatile_fid; if (query_attrs) req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB; else req->Flags = 0; iov[0].iov_base = (char *)req; iov[0].iov_len = total_len; return 0; } void SMB2_close_free(struct smb_rqst *rqst) { if (rqst && rqst->rq_iov) cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */ } int __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, struct smb2_file_network_open_info *pbuf) { struct smb_rqst rqst; struct smb2_close_rsp *rsp = NULL; struct cifs_ses *ses = tcon->ses; struct kvec iov[1]; struct kvec rsp_iov; int resp_buftype = CIFS_NO_BUFFER; int rc = 0; int flags = 0; bool query_attrs = false; cifs_dbg(FYI, "Close\n"); if (!ses || !(ses->server)) return -EIO; if (smb3_encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; memset(&rqst, 0, sizeof(struct smb_rqst)); memset(&iov, 0, sizeof(iov)); rqst.rq_iov = iov; rqst.rq_nvec = 1; /* check if need to ask server to return timestamps in close response */ if (pbuf) query_attrs = true; trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid); rc = SMB2_close_init(tcon, &rqst, persistent_fid, volatile_fid, query_attrs); if (rc) goto close_exit; rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov); rsp = (struct smb2_close_rsp *)rsp_iov.iov_base; if (rc != 0) { cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE); trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid, rc); goto close_exit; } else { trace_smb3_close_done(xid, persistent_fid, tcon->tid, ses->Suid); /* * Note that have to subtract 4 since struct network_open_info * has a final 4 byte pad that close response does not have */ if (pbuf) memcpy(pbuf, (char *)&rsp->CreationTime, sizeof(*pbuf) - 4); } atomic_dec(&tcon->num_remote_opens); close_exit: SMB2_close_free(&rqst); free_rsp_buf(resp_buftype, rsp); /* retry close in a worker thread if this one is interrupted */ if (rc == -EINTR) { int tmp_rc; tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid, volatile_fid); if (tmp_rc) cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n", persistent_fid, tmp_rc); } return rc; } int SMB2_close(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid) { return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL); } int smb2_validate_iov(unsigned int offset, unsigned int buffer_length, struct kvec *iov, unsigned int min_buf_size) { unsigned int smb_len = iov->iov_len; char *end_of_smb = smb_len + (char *)iov->iov_base; char *begin_of_buf = offset + (char *)iov->iov_base; 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. */ int smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length, struct kvec *iov, unsigned int minbufsize, char *data) { char *begin_of_buf = offset + (char *)iov->iov_base; int rc; if (!data) return -EINVAL; rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize); if (rc) return rc; memcpy(data, begin_of_buf, buffer_length); return 0; } int SMB2_query_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type, u32 additional_info, size_t output_len, size_t input_len, void *input) { struct smb2_query_info_req *req; struct kvec *iov = rqst->rq_iov; unsigned int total_len; int rc; rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req, &total_len); if (rc) return rc; req->InfoType = info_type; req->FileInfoClass = info_class; req->PersistentFileId = persistent_fid; req->VolatileFileId = volatile_fid; req->AdditionalInformation = cpu_to_le32(additional_info); req->OutputBufferLength = cpu_to_le32(output_len); if (input_len) { req->InputBufferLength = cpu_to_le32(input_len); /* total_len for smb query request never close to le16 max */ req->InputBufferOffset = cpu_to_le16(total_len - 1); memcpy(req->Buffer, input, input_len); } iov[0].iov_base = (char *)req; /* 1 for Buffer */ iov[0].iov_len = total_len - 1 + input_len; return 0; } void SMB2_query_info_free(struct smb_rqst *rqst) { if (rqst && rqst->rq_iov) cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */ } static int query_info(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type, u32 additional_info, size_t output_len, size_t min_len, void **data, u32 *dlen) { struct smb_rqst rqst; struct smb2_query_info_rsp *rsp = NULL; struct kvec iov[1]; struct kvec rsp_iov; int rc = 0; int resp_buftype = CIFS_NO_BUFFER; struct cifs_ses *ses = tcon->ses; struct TCP_Server_Info *server; int flags = 0; bool allocated = false; cifs_dbg(FYI, "Query Info\n"); if (!ses) return -EIO; server = ses->server; if (!server) return -EIO; if (smb3_encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; memset(&rqst, 0, sizeof(struct smb_rqst)); memset(&iov, 0, sizeof(iov)); rqst.rq_iov = iov; rqst.rq_nvec = 1; rc = SMB2_query_info_init(tcon, &rqst, persistent_fid, volatile_fid, info_class, info_type, additional_info, output_len, 0, NULL); if (rc) goto qinf_exit; trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid, ses->Suid, info_class, (__u32)info_type); rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov); rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base; if (rc) { cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE); trace_smb3_query_info_err(xid, persistent_fid, tcon->tid, ses->Suid, info_class, (__u32)info_type, rc); goto qinf_exit; } trace_smb3_query_info_done(xid, persistent_fid, tcon->tid, ses->Suid, info_class, (__u32)info_type); if (dlen) { *dlen = le32_to_cpu(rsp->OutputBufferLength); if (!*data) { *data = kmalloc(*dlen, GFP_KERNEL); if (!*data) { cifs_tcon_dbg(VFS, "Error %d allocating memory for acl\n", rc); *dlen = 0; rc = -ENOMEM; goto qinf_exit; } allocated = true; } } rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset), le32_to_cpu(rsp->OutputBufferLength), &rsp_iov, min_len, *data); if (rc && allocated) { kfree(*data); *data = NULL; *dlen = 0; } qinf_exit: SMB2_query_info_free(&rqst); 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, SMB2_O_INFO_FILE, 0, sizeof(struct smb2_file_all_info) + PATH_MAX * 2, sizeof(struct smb2_file_all_info), (void **)&data, NULL); } int SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, void **data, u32 *plen) { __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO; *plen = 0; return query_info(xid, tcon, persistent_fid, volatile_fid, 0, SMB2_O_INFO_SECURITY, additional_info, SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen); } 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, SMB2_O_INFO_FILE, 0, sizeof(struct smb2_file_internal_info), sizeof(struct smb2_file_internal_info), (void **)&uniqueid, NULL); } /* * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory * See MS-SMB2 2.2.35 and 2.2.36 */ static int SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, u32 completion_filter, bool watch_tree) { struct smb2_change_notify_req *req; struct kvec *iov = rqst->rq_iov; unsigned int total_len; int rc; rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, (void **) &req, &total_len); if (rc) return rc; req->PersistentFileId = persistent_fid; req->VolatileFileId = volatile_fid; /* See note 354 of MS-SMB2, 64K max */ req->OutputBufferLength = cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE); req->CompletionFilter = cpu_to_le32(completion_filter); if (watch_tree) req->Flags = cpu_to_le16(SMB2_WATCH_TREE); else req->Flags = 0; iov[0].iov_base = (char *)req; iov[0].iov_len = total_len; return 0; } int SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, bool watch_tree, u32 completion_filter) { struct cifs_ses *ses = tcon->ses; struct smb_rqst rqst; struct kvec iov[1]; struct kvec rsp_iov = {NULL, 0}; int resp_buftype = CIFS_NO_BUFFER; int flags = 0; int rc = 0; cifs_dbg(FYI, "change notify\n"); if (!ses || !(ses->server)) return -EIO; if (smb3_encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; memset(&rqst, 0, sizeof(struct smb_rqst)); memset(&iov, 0, sizeof(iov)); rqst.rq_iov = iov; rqst.rq_nvec = 1; rc = SMB2_notify_init(xid, &rqst, tcon, persistent_fid, volatile_fid, completion_filter, watch_tree); if (rc) goto cnotify_exit; trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid, (u8)watch_tree, completion_filter); rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov); if (rc != 0) { cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE); trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid, (u8)watch_tree, completion_filter, rc); } else trace_smb3_notify_done(xid, persistent_fid, tcon->tid, ses->Suid, (u8)watch_tree, completion_filter); cnotify_exit: if (rqst.rq_iov) cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */ free_rsp_buf(resp_buftype, rsp_iov.iov_base); 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 *rsp = (struct smb2_echo_rsp *)mid->resp_buf; struct cifs_credits credits = { .value = 0, .instance = 0 }; if (mid->mid_state == MID_RESPONSE_RECEIVED || mid->mid_state == MID_RESPONSE_MALFORMED) { credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest); credits.instance = server->reconnect_instance; } DeleteMidQEntry(mid); add_credits(server, &credits, CIFS_ECHO_OP); } void smb2_reconnect_server(struct work_struct *work) { struct TCP_Server_Info *server = container_of(work, struct TCP_Server_Info, reconnect.work); struct cifs_ses *ses; struct cifs_tcon *tcon, *tcon2; struct list_head tmp_list; int tcon_exist = false; int rc; int resched = false; /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */ mutex_lock(&server->reconnect_mutex); INIT_LIST_HEAD(&tmp_list); cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n"); spin_lock(&cifs_tcp_ses_lock); list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) { list_for_each_entry(tcon, &ses->tcon_list, tcon_list) { if (tcon->need_reconnect || tcon->need_reopen_files) { tcon->tc_count++; list_add_tail(&tcon->rlist, &tmp_list); tcon_exist = true; } } /* * IPC has the same lifetime as its session and uses its * refcount. */ if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) { list_add_tail(&ses->tcon_ipc->rlist, &tmp_list); tcon_exist = true; ses->ses_count++; } } /* * Get the reference to server struct to be sure that the last call of * cifs_put_tcon() in the loop below won't release the server pointer. */ if (tcon_exist) server->srv_count++; spin_unlock(&cifs_tcp_ses_lock); list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) { rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon); if (!rc) cifs_reopen_persistent_handles(tcon); else resched = true; list_del_init(&tcon->rlist); if (tcon->ipc) cifs_put_smb_ses(tcon->ses); else cifs_put_tcon(tcon); } cifs_dbg(FYI, "Reconnecting tcons finished\n"); if (resched) queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ); mutex_unlock(&server->reconnect_mutex); /* now we can safely release srv struct */ if (tcon_exist) cifs_put_tcp_session(server, 1); } int SMB2_echo(struct TCP_Server_Info *server) { struct smb2_echo_req *req; int rc = 0; struct kvec iov[1]; struct smb_rqst rqst = { .rq_iov = iov, .rq_nvec = 1 }; unsigned int total_len; cifs_dbg(FYI, "In echo request\n"); if (server->tcpStatus == CifsNeedNegotiate) { /* No need to send echo on newly established connections */ mod_delayed_work(cifsiod_wq, &server->reconnect, 0); return rc; } rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len); if (rc) return rc; req->sync_hdr.CreditRequest = cpu_to_le16(1); iov[0].iov_len = total_len; iov[0].iov_base = (char *)req; rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL, server, CIFS_ECHO_OP, NULL); if (rc) cifs_dbg(FYI, "Echo request failed: %d\n", rc); cifs_small_buf_release(req); return rc; } void SMB2_flush_free(struct smb_rqst *rqst) { if (rqst && rqst->rq_iov) cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */ } int SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid) { struct smb2_flush_req *req; struct kvec *iov = rqst->rq_iov; unsigned int total_len; int rc; rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len); if (rc) return rc; req->PersistentFileId = persistent_fid; req->VolatileFileId = volatile_fid; iov[0].iov_base = (char *)req; iov[0].iov_len = total_len; return 0; } int SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid) { struct cifs_ses *ses = tcon->ses; struct smb_rqst rqst; struct kvec iov[1]; struct kvec rsp_iov = {NULL, 0}; int resp_buftype = CIFS_NO_BUFFER; int flags = 0; int rc = 0; cifs_dbg(FYI, "flush\n"); if (!ses || !(ses->server)) return -EIO; if (smb3_encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; memset(&rqst, 0, sizeof(struct smb_rqst)); memset(&iov, 0, sizeof(iov)); rqst.rq_iov = iov; rqst.rq_nvec = 1; rc = SMB2_flush_init(xid, &rqst, tcon, persistent_fid, volatile_fid); if (rc) goto flush_exit; trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid); rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov); if (rc != 0) { cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE); trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid, rc); } else trace_smb3_flush_done(xid, persistent_fid, tcon->tid, ses->Suid); flush_exit: SMB2_flush_free(&rqst); free_rsp_buf(resp_buftype, rsp_iov.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(void **buf, unsigned int *total_len, struct cifs_io_parms *io_parms, struct cifs_readdata *rdata, unsigned int remaining_bytes, int request_type) { int rc = -EACCES; struct smb2_read_plain_req *req = NULL; struct smb2_sync_hdr *shdr; struct TCP_Server_Info *server; rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req, total_len); if (rc) return rc; server = io_parms->tcon->ses->server; if (server == NULL) return -ECONNABORTED; shdr = &req->sync_hdr; shdr->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); trace_smb3_read_enter(0 /* xid */, io_parms->persistent_fid, io_parms->tcon->tid, io_parms->tcon->ses->Suid, io_parms->offset, io_parms->length); #ifdef CONFIG_CIFS_SMB_DIRECT /* * If we want to do a RDMA write, fill in and append * smbd_buffer_descriptor_v1 to the end of read request */ if (server->rdma && rdata && !server->sign && rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) { struct smbd_buffer_descriptor_v1 *v1; bool need_invalidate = io_parms->tcon->ses->server->dialect == SMB30_PROT_ID; rdata->mr = smbd_register_mr( server->smbd_conn, rdata->pages, rdata->nr_pages, rdata->page_offset, rdata->tailsz, true, need_invalidate); if (!rdata->mr) return -EAGAIN; req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE; if (need_invalidate) req->Channel = SMB2_CHANNEL_RDMA_V1; req->ReadChannelInfoOffset = cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer)); req->ReadChannelInfoLength = cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1)); v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0]; v1->offset = cpu_to_le64(rdata->mr->mr->iova); v1->token = cpu_to_le32(rdata->mr->mr->rkey); v1->length = cpu_to_le32(rdata->mr->mr->length); *total_len += sizeof(*v1) - 1; } #endif if (request_type & CHAINED_REQUEST) { if (!(request_type & END_OF_CHAIN)) { /* next 8-byte aligned request */ *total_len = DIV_ROUND_UP(*total_len, 8) * 8; shdr->NextCommand = cpu_to_le32(*total_len); } else /* END_OF_CHAIN */ shdr->NextCommand = 0; if (request_type & RELATED_REQUEST) { shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS; /* * Related requests use info from previous read request * in chain. */ shdr->SessionId = 0xFFFFFFFF; shdr->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; *buf = req; 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_sync_hdr *shdr = (struct smb2_sync_hdr *)rdata->iov[0].iov_base; struct cifs_credits credits = { .value = 0, .instance = 0 }; struct smb_rqst rqst = { .rq_iov = &rdata->iov[1], .rq_nvec = 1, .rq_pages = rdata->pages, .rq_offset = rdata->page_offset, .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.value = le16_to_cpu(shdr->CreditRequest); credits.instance = server->reconnect_instance; /* result already set, check signature */ if (server->sign && !mid->decrypted) { int rc; rc = smb2_verify_signature(&rqst, server); if (rc) cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n", rc); } /* FIXME: should this be counted toward the initiating task? */ task_io_account_read(rdata->got_bytes); cifs_stats_bytes_read(tcon, rdata->got_bytes); break; case MID_REQUEST_SUBMITTED: case MID_RETRY_NEEDED: rdata->result = -EAGAIN; if (server->sign && rdata->got_bytes) /* reset bytes number since we can not check a sign */ rdata->got_bytes = 0; /* FIXME: should this be counted toward the initiating task? */ task_io_account_read(rdata->got_bytes); cifs_stats_bytes_read(tcon, rdata->got_bytes); break; case MID_RESPONSE_MALFORMED: credits.value = le16_to_cpu(shdr->CreditRequest); credits.instance = server->reconnect_instance; /* fall through */ default: rdata->result = -EIO; } #ifdef CONFIG_CIFS_SMB_DIRECT /* * If this rdata has a memmory registered, the MR can be freed * MR needs to be freed as soon as I/O finishes to prevent deadlock * because they have limited number and are used for future I/Os */ if (rdata->mr) { smbd_deregister_mr(rdata->mr); rdata->mr = NULL; } #endif if (rdata->result && rdata->result != -ENODATA) { cifs_stats_fail_inc(tcon, SMB2_READ_HE); trace_smb3_read_err(0 /* xid */, rdata->cfile->fid.persistent_fid, tcon->tid, tcon->ses->Suid, rdata->offset, rdata->bytes, rdata->result); } else trace_smb3_read_done(0 /* xid */, rdata->cfile->fid.persistent_fid, tcon->tid, tcon->ses->Suid, rdata->offset, rdata->got_bytes); queue_work(cifsiod_wq, &rdata->work); DeleteMidQEntry(mid); add_credits(server, &credits, 0); } /* smb2_async_readv - send an async read, and set up mid to handle result */ int smb2_async_readv(struct cifs_readdata *rdata) { int rc, flags = 0; char *buf; struct smb2_sync_hdr *shdr; struct cifs_io_parms io_parms; struct smb_rqst rqst = { .rq_iov = rdata->iov, .rq_nvec = 1 }; struct TCP_Server_Info *server; unsigned int total_len; 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; server = io_parms.tcon->ses->server; rc = smb2_new_read_req( (void **) &buf, &total_len, &io_parms, rdata, 0, 0); if (rc) return rc; if (smb3_encryption_required(io_parms.tcon)) flags |= CIFS_TRANSFORM_REQ; rdata->iov[0].iov_base = buf; rdata->iov[0].iov_len = total_len; shdr = (struct smb2_sync_hdr *)buf; if (rdata->credits.value > 0) { shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes, SMB2_MAX_BUFFER_SIZE)); shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1); rc = adjust_credits(server, &rdata->credits, rdata->bytes); if (rc) goto async_readv_out; flags |= CIFS_HAS_CREDITS; } kref_get(&rdata->refcount); rc = cifs_call_async(io_parms.tcon->ses->server, &rqst, cifs_readv_receive, smb2_readv_callback, smb3_handle_read_data, rdata, flags, &rdata->credits); if (rc) { kref_put(&rdata->refcount, cifs_readdata_release); cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE); trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid, io_parms.tcon->tid, io_parms.tcon->ses->Suid, io_parms.offset, io_parms.length, rc); } async_readv_out: 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) { struct smb_rqst rqst; int resp_buftype, rc; struct smb2_read_plain_req *req = NULL; struct smb2_read_rsp *rsp = NULL; struct kvec iov[1]; struct kvec rsp_iov; unsigned int total_len; int flags = CIFS_LOG_ERROR; struct cifs_ses *ses = io_parms->tcon->ses; *nbytes = 0; rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0); if (rc) return rc; if (smb3_encryption_required(io_parms->tcon)) flags |= CIFS_TRANSFORM_REQ; iov[0].iov_base = (char *)req; iov[0].iov_len = total_len; memset(&rqst, 0, sizeof(struct smb_rqst)); rqst.rq_iov = iov; rqst.rq_nvec = 1; rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov); rsp = (struct smb2_read_rsp *)rsp_iov.iov_base; if (rc) { if (rc != -ENODATA) { cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE); cifs_dbg(VFS, "Send error in read = %d\n", rc); trace_smb3_read_err(xid, req->PersistentFileId, io_parms->tcon->tid, ses->Suid, io_parms->offset, io_parms->length, rc); } else trace_smb3_read_done(xid, req->PersistentFileId, io_parms->tcon->tid, ses->Suid, io_parms->offset, 0); free_rsp_buf(resp_buftype, rsp_iov.iov_base); cifs_small_buf_release(req); return rc == -ENODATA ? 0 : rc; } else trace_smb3_read_done(xid, req->PersistentFileId, io_parms->tcon->tid, ses->Suid, io_parms->offset, io_parms->length); cifs_small_buf_release(req); *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 + rsp->DataOffset, *nbytes); free_rsp_buf(resp_buftype, rsp_iov.iov_base); } else if (resp_buftype != CIFS_NO_BUFFER) { *buf = rsp_iov.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); struct TCP_Server_Info *server = tcon->ses->server; unsigned int written; struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf; struct cifs_credits credits = { .value = 0, .instance = 0 }; switch (mid->mid_state) { case MID_RESPONSE_RECEIVED: credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest); credits.instance = server->reconnect_instance; wdata->result = smb2_check_receive(mid, 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; case MID_RESPONSE_MALFORMED: credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest); credits.instance = server->reconnect_instance; /* fall through */ default: wdata->result = -EIO; break; } #ifdef CONFIG_CIFS_SMB_DIRECT /* * If this wdata has a memory registered, the MR can be freed * The number of MRs available is limited, it's important to recover * used MR as soon as I/O is finished. Hold MR longer in the later * I/O process can possibly result in I/O deadlock due to lack of MR * to send request on I/O retry */ if (wdata->mr) { smbd_deregister_mr(wdata->mr); wdata->mr = NULL; } #endif if (wdata->result) { cifs_stats_fail_inc(tcon, SMB2_WRITE_HE); trace_smb3_write_err(0 /* no xid */, wdata->cfile->fid.persistent_fid, tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes, wdata->result); if (wdata->result == -ENOSPC) printk_once(KERN_WARNING "Out of space writing to %s\n", tcon->treeName); } else trace_smb3_write_done(0 /* no xid */, wdata->cfile->fid.persistent_fid, tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes); queue_work(cifsiod_wq, &wdata->work); DeleteMidQEntry(mid); add_credits(server, &credits, 0); } /* smb2_async_writev - send an async write, and set up mid to handle result */ int smb2_async_writev(struct cifs_writedata *wdata, void (*release)(struct kref *kref)) { int rc = -EACCES, flags = 0; struct smb2_write_req *req = NULL; struct smb2_sync_hdr *shdr; struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink); struct TCP_Server_Info *server = tcon->ses->server; struct kvec iov[1]; struct smb_rqst rqst = { }; unsigned int total_len; rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len); if (rc) return rc; if (smb3_encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; shdr = (struct smb2_sync_hdr *)req; shdr->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); req->DataOffset = cpu_to_le16( offsetof(struct smb2_write_req, Buffer)); req->RemainingBytes = 0; trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid, tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes); #ifdef CONFIG_CIFS_SMB_DIRECT /* * If we want to do a server RDMA read, fill in and append * smbd_buffer_descriptor_v1 to the end of write request */ if (server->rdma && !server->sign && wdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) { struct smbd_buffer_descriptor_v1 *v1; bool need_invalidate = server->dialect == SMB30_PROT_ID; wdata->mr = smbd_register_mr( server->smbd_conn, wdata->pages, wdata->nr_pages, wdata->page_offset, wdata->tailsz, false, need_invalidate); if (!wdata->mr) { rc = -EAGAIN; goto async_writev_out; } req->Length = 0; req->DataOffset = 0; if (wdata->nr_pages > 1) req->RemainingBytes = cpu_to_le32( (wdata->nr_pages - 1) * wdata->pagesz - wdata->page_offset + wdata->tailsz ); else req->RemainingBytes = cpu_to_le32(wdata->tailsz); req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE; if (need_invalidate) req->Channel = SMB2_CHANNEL_RDMA_V1; req->WriteChannelInfoOffset = cpu_to_le16(offsetof(struct smb2_write_req, Buffer)); req->WriteChannelInfoLength = cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1)); v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0]; v1->offset = cpu_to_le64(wdata->mr->mr->iova); v1->token = cpu_to_le32(wdata->mr->mr->rkey); v1->length = cpu_to_le32(wdata->mr->mr->length); } #endif iov[0].iov_len = total_len - 1; iov[0].iov_base = (char *)req; rqst.rq_iov = iov; rqst.rq_nvec = 1; rqst.rq_pages = wdata->pages; rqst.rq_offset = wdata->page_offset; rqst.rq_npages = wdata->nr_pages; rqst.rq_pagesz = wdata->pagesz; rqst.rq_tailsz = wdata->tailsz; #ifdef CONFIG_CIFS_SMB_DIRECT if (wdata->mr) { iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1); rqst.rq_npages = 0; } #endif cifs_dbg(FYI, "async write at %llu %u bytes\n", wdata->offset, wdata->bytes); #ifdef CONFIG_CIFS_SMB_DIRECT /* For RDMA read, I/O size is in RemainingBytes not in Length */ if (!wdata->mr) req->Length = cpu_to_le32(wdata->bytes); #else req->Length = cpu_to_le32(wdata->bytes); #endif if (wdata->credits.value > 0) { shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes, SMB2_MAX_BUFFER_SIZE)); shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1); rc = adjust_credits(server, &wdata->credits, wdata->bytes); if (rc) goto async_writev_out; flags |= CIFS_HAS_CREDITS; } kref_get(&wdata->refcount); rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL, wdata, flags, &wdata->credits); if (rc) { trace_smb3_write_err(0 /* no xid */, req->PersistentFileId, tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes, rc); kref_put(&wdata->refcount, 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) { struct smb_rqst rqst; int rc = 0; struct smb2_write_req *req = NULL; struct smb2_write_rsp *rsp = NULL; int resp_buftype; struct kvec rsp_iov; int flags = 0; unsigned int total_len; *nbytes = 0; if (n_vec < 1) return rc; rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req, &total_len); if (rc) return rc; if (io_parms->tcon->ses->server == NULL) return -ECONNABORTED; if (smb3_encryption_required(io_parms->tcon)) flags |= CIFS_TRANSFORM_REQ; req->sync_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); req->DataOffset = cpu_to_le16( offsetof(struct smb2_write_req, Buffer)); req->RemainingBytes = 0; trace_smb3_write_enter(xid, io_parms->persistent_fid, io_parms->tcon->tid, io_parms->tcon->ses->Suid, io_parms->offset, io_parms->length); iov[0].iov_base = (char *)req; /* 1 for Buffer */ iov[0].iov_len = total_len - 1; memset(&rqst, 0, sizeof(struct smb_rqst)); rqst.rq_iov = iov; rqst.rq_nvec = n_vec + 1; rc = cifs_send_recv(xid, io_parms->tcon->ses, &rqst, &resp_buftype, flags, &rsp_iov); rsp = (struct smb2_write_rsp *)rsp_iov.iov_base; if (rc) { trace_smb3_write_err(xid, req->PersistentFileId, io_parms->tcon->tid, io_parms->tcon->ses->Suid, io_parms->offset, io_parms->length, 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); trace_smb3_write_done(xid, req->PersistentFileId, io_parms->tcon->tid, io_parms->tcon->ses->Suid, io_parms->offset, *nbytes); } cifs_small_buf_release(req); free_rsp_buf(resp_buftype, rsp); return rc; } int posix_info_sid_size(const void *beg, const void *end) { size_t subauth; int total; if (beg + 1 > end) return -1; subauth = *(u8 *)(beg+1); if (subauth < 1 || subauth > 15) return -1; total = 1 + 1 + 6 + 4*subauth; if (beg + total > end) return -1; return total; } int posix_info_parse(const void *beg, const void *end, struct smb2_posix_info_parsed *out) { int total_len = 0; int sid_len; int name_len; const void *owner_sid; const void *group_sid; const void *name; /* if no end bound given, assume payload to be correct */ if (!end) { const struct smb2_posix_info *p = beg; end = beg + le32_to_cpu(p->NextEntryOffset); /* last element will have a 0 offset, pick a sensible bound */ if (end == beg) end += 0xFFFF; } /* check base buf */ if (beg + sizeof(struct smb2_posix_info) > end) return -1; total_len = sizeof(struct smb2_posix_info); /* check owner sid */ owner_sid = beg + total_len; sid_len = posix_info_sid_size(owner_sid, end); if (sid_len < 0) return -1; total_len += sid_len; /* check group sid */ group_sid = beg + total_len; sid_len = posix_info_sid_size(group_sid, end); if (sid_len < 0) return -1; total_len += sid_len; /* check name len */ if (beg + total_len + 4 > end) return -1; name_len = le32_to_cpu(*(__le32 *)(beg + total_len)); if (name_len < 1 || name_len > 0xFFFF) return -1; total_len += 4; /* check name */ name = beg + total_len; if (name + name_len > end) return -1; total_len += name_len; if (out) { out->base = beg; out->size = total_len; out->name_len = name_len; out->name = name; memcpy(&out->owner, owner_sid, posix_info_sid_size(owner_sid, end)); memcpy(&out->group, group_sid, posix_info_sid_size(group_sid, end)); } return total_len; } static int posix_info_extra_size(const void *beg, const void *end) { int len = posix_info_parse(beg, end, NULL); if (len < 0) return -1; return len - sizeof(struct smb2_posix_info); } static unsigned int num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry, size_t size) { int len; unsigned int entrycount = 0; unsigned int next_offset = 0; char *entryptr; FILE_DIRECTORY_INFO *dir_info; if (bufstart == NULL) return 0; entryptr = bufstart; while (1) { if (entryptr + next_offset < entryptr || entryptr + next_offset > end_of_buf || entryptr + next_offset + size > end_of_buf) { cifs_dbg(VFS, "malformed search entry would overflow\n"); break; } entryptr = entryptr + next_offset; dir_info = (FILE_DIRECTORY_INFO *)entryptr; if (infotype == SMB_FIND_FILE_POSIX_INFO) len = posix_info_extra_size(entryptr, end_of_buf); else len = le32_to_cpu(dir_info->FileNameLength); if (len < 0 || entryptr + len < entryptr || entryptr + len > end_of_buf || 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 = entryptr; entrycount++; next_offset = le32_to_cpu(dir_info->NextEntryOffset); if (!next_offset) break; } return entrycount; } /* * Readdir/FindFirst */ int SMB2_query_directory_init(const unsigned int xid, struct cifs_tcon *tcon, struct smb_rqst *rqst, u64 persistent_fid, u64 volatile_fid, int index, int info_level) { struct TCP_Server_Info *server = tcon->ses->server; struct smb2_query_directory_req *req; unsigned char *bufptr; __le16 asteriks = cpu_to_le16('*'); unsigned int output_size = CIFSMaxBufSize - MAX_SMB2_CREATE_RESPONSE_SIZE - MAX_SMB2_CLOSE_RESPONSE_SIZE; unsigned int total_len; struct kvec *iov = rqst->rq_iov; int len, rc; rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req, &total_len); if (rc) return rc; switch (info_level) { case SMB_FIND_FILE_DIRECTORY_INFO: req->FileInformationClass = FILE_DIRECTORY_INFORMATION; break; case SMB_FIND_FILE_ID_FULL_DIR_INFO: req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION; break; case SMB_FIND_FILE_POSIX_INFO: req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO; break; default: cifs_tcon_dbg(VFS, "info level %u isn't supported\n", info_level); return -EINVAL; } 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); 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; /* 1 for Buffer */ iov[0].iov_len = total_len - 1; iov[1].iov_base = (char *)(req->Buffer); iov[1].iov_len = len; trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid, tcon->ses->Suid, index, output_size); return 0; } void SMB2_query_directory_free(struct smb_rqst *rqst) { if (rqst && rqst->rq_iov) { cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */ } } int smb2_parse_query_directory(struct cifs_tcon *tcon, struct kvec *rsp_iov, int resp_buftype, struct cifs_search_info *srch_inf) { struct smb2_query_directory_rsp *rsp; size_t info_buf_size; char *end_of_smb; int rc; rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base; switch (srch_inf->info_level) { case SMB_FIND_FILE_DIRECTORY_INFO: info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1; break; case SMB_FIND_FILE_ID_FULL_DIR_INFO: info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1; break; case SMB_FIND_FILE_POSIX_INFO: /* note that posix payload are variable size */ info_buf_size = sizeof(struct smb2_posix_info); break; default: cifs_tcon_dbg(VFS, "info level %u isn't supported\n", srch_inf->info_level); return -EINVAL; } rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset), le32_to_cpu(rsp->OutputBufferLength), rsp_iov, info_buf_size); if (rc) { cifs_tcon_dbg(VFS, "bad info payload"); return rc; } 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 = (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset); end_of_smb = rsp_iov->iov_len + (char *)rsp; srch_inf->entries_in_buffer = num_entries( srch_inf->info_level, 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_tcon_dbg(VFS, "illegal search buffer type\n"); return 0; } 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 smb_rqst rqst; struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE]; struct smb2_query_directory_rsp *rsp = NULL; int resp_buftype = CIFS_NO_BUFFER; struct kvec rsp_iov; int rc = 0; struct cifs_ses *ses = tcon->ses; int flags = 0; if (!ses || !(ses->server)) return -EIO; if (smb3_encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; memset(&rqst, 0, sizeof(struct smb_rqst)); memset(&iov, 0, sizeof(iov)); rqst.rq_iov = iov; rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE; rc = SMB2_query_directory_init(xid, tcon, &rqst, persistent_fid, volatile_fid, index, srch_inf->info_level); if (rc) goto qdir_exit; rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov); rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base; if (rc) { if (rc == -ENODATA && rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) { trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid, tcon->ses->Suid, index, 0); srch_inf->endOfSearch = true; rc = 0; } else { trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid, tcon->ses->Suid, index, 0, rc); cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE); } goto qdir_exit; } rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype, srch_inf); if (rc) { trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid, tcon->ses->Suid, index, 0, rc); goto qdir_exit; } resp_buftype = CIFS_NO_BUFFER; trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid, tcon->ses->Suid, index, srch_inf->entries_in_buffer); qdir_exit: SMB2_query_directory_free(&rqst); free_rsp_buf(resp_buftype, rsp); return rc; } int SMB2_set_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class, u8 info_type, u32 additional_info, void **data, unsigned int *size) { struct smb2_set_info_req *req; struct kvec *iov = rqst->rq_iov; unsigned int i, total_len; int rc; rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len); if (rc) return rc; req->sync_hdr.ProcessId = cpu_to_le32(pid); req->InfoType = info_type; req->FileInfoClass = info_class; req->PersistentFileId = persistent_fid; req->VolatileFileId = volatile_fid; req->AdditionalInformation = cpu_to_le32(additional_info); req->BufferOffset = cpu_to_le16(sizeof(struct smb2_set_info_req) - 1); req->BufferLength = cpu_to_le32(*size); memcpy(req->Buffer, *data, *size); total_len += *size; iov[0].iov_base = (char *)req; /* 1 for Buffer */ iov[0].iov_len = total_len - 1; for (i = 1; i < rqst->rq_nvec; i++) { le32_add_cpu(&req->BufferLength, size[i]); iov[i].iov_base = (char *)data[i]; iov[i].iov_len = size[i]; } return 0; } void SMB2_set_info_free(struct smb_rqst *rqst) { if (rqst && rqst->rq_iov) cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */ } static int send_set_info(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class, u8 info_type, u32 additional_info, unsigned int num, void **data, unsigned int *size) { struct smb_rqst rqst; struct smb2_set_info_rsp *rsp = NULL; struct kvec *iov; struct kvec rsp_iov; int rc = 0; int resp_buftype; struct cifs_ses *ses = tcon->ses; int flags = 0; if (!ses || !(ses->server)) return -EIO; if (!num) return -EINVAL; if (smb3_encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL); if (!iov) return -ENOMEM; memset(&rqst, 0, sizeof(struct smb_rqst)); rqst.rq_iov = iov; rqst.rq_nvec = num; rc = SMB2_set_info_init(tcon, &rqst, persistent_fid, volatile_fid, pid, info_class, info_type, additional_info, data, size); if (rc) { kfree(iov); return rc; } rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov); SMB2_set_info_free(&rqst); rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base; if (rc != 0) { cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE); trace_smb3_set_info_err(xid, persistent_fid, tcon->tid, ses->Suid, info_class, (__u32)info_type, rc); } free_rsp_buf(resp_buftype, rsp); kfree(iov); 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, SMB2_O_INFO_FILE, 0, 1, &data, &size); } int SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, struct cifs_ntsd *pnntsd, int pacllen, int aclflag) { return send_set_info(xid, tcon, persistent_fid, volatile_fid, current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag, 1, (void **)&pnntsd, &pacllen); } int SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, struct smb2_file_full_ea_info *buf, int len) { return send_set_info(xid, tcon, persistent_fid, volatile_fid, current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 0, 1, (void **)&buf, &len); } int SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon, const u64 persistent_fid, const u64 volatile_fid, __u8 oplock_level) { struct smb_rqst rqst; int rc; struct smb2_oplock_break *req = NULL; struct cifs_ses *ses = tcon->ses; int flags = CIFS_OBREAK_OP; unsigned int total_len; struct kvec iov[1]; struct kvec rsp_iov; int resp_buf_type; cifs_dbg(FYI, "SMB2_oplock_break\n"); rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req, &total_len); if (rc) return rc; if (smb3_encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; req->VolatileFid = volatile_fid; req->PersistentFid = persistent_fid; req->OplockLevel = oplock_level; req->sync_hdr.CreditRequest = cpu_to_le16(1); flags |= CIFS_NO_RSP_BUF; iov[0].iov_base = (char *)req; iov[0].iov_len = total_len; memset(&rqst, 0, sizeof(struct smb_rqst)); rqst.rq_iov = iov; rqst.rq_nvec = 1; rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov); cifs_small_buf_release(req); if (rc) { cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE); cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc); } return rc; } void smb2_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 = kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits); return; } static void copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data, struct kstatfs *kst) { kst->f_bsize = le32_to_cpu(response_data->BlockSize); kst->f_blocks = le64_to_cpu(response_data->TotalBlocks); kst->f_bfree = le64_to_cpu(response_data->BlocksAvail); if (response_data->UserBlocksAvail == cpu_to_le64(-1)) kst->f_bavail = kst->f_bfree; else kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail); if (response_data->TotalFileNodes != cpu_to_le64(-1)) kst->f_files = le64_to_cpu(response_data->TotalFileNodes); if (response_data->FreeFileNodes != cpu_to_le64(-1)) kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes); 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; unsigned int total_len; cifs_dbg(FYI, "Query FSInfo level %d\n", level); if ((tcon->ses == NULL) || (tcon->ses->server == NULL)) return -EIO; rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req, &total_len); if (rc) return rc; req->InfoType = SMB2_O_INFO_FILESYSTEM; req->FileInfoClass = level; req->PersistentFileId = persistent_fid; req->VolatileFileId = volatile_fid; /* 1 for pad */ req->InputBufferOffset = cpu_to_le16(sizeof(struct smb2_query_info_req) - 1); req->OutputBufferLength = cpu_to_le32( outbuf_len + sizeof(struct smb2_query_info_rsp) - 1); iov->iov_base = (char *)req; iov->iov_len = total_len; return 0; } int SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata) { struct smb_rqst rqst; struct smb2_query_info_rsp *rsp = NULL; struct kvec iov; struct kvec rsp_iov; int rc = 0; int resp_buftype; struct cifs_ses *ses = tcon->ses; FILE_SYSTEM_POSIX_INFO *info = NULL; int flags = 0; rc = build_qfs_info_req(&iov, tcon, FS_POSIX_INFORMATION, sizeof(FILE_SYSTEM_POSIX_INFO), persistent_fid, volatile_fid); if (rc) return rc; if (smb3_encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; memset(&rqst, 0, sizeof(struct smb_rqst)); rqst.rq_iov = &iov; rqst.rq_nvec = 1; rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov); cifs_small_buf_release(iov.iov_base); if (rc) { cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE); goto posix_qfsinf_exit; } rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base; info = (FILE_SYSTEM_POSIX_INFO *)( le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp); rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset), le32_to_cpu(rsp->OutputBufferLength), &rsp_iov, sizeof(FILE_SYSTEM_POSIX_INFO)); if (!rc) copy_posix_fs_info_to_kstatfs(info, fsdata); posix_qfsinf_exit: free_rsp_buf(resp_buftype, rsp_iov.iov_base); return rc; } int SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata) { struct smb_rqst rqst; struct smb2_query_info_rsp *rsp = NULL; struct kvec iov; struct kvec rsp_iov; int rc = 0; int resp_buftype; struct cifs_ses *ses = tcon->ses; struct smb2_fs_full_size_info *info = NULL; int flags = 0; 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; if (smb3_encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; memset(&rqst, 0, sizeof(struct smb_rqst)); rqst.rq_iov = &iov; rqst.rq_nvec = 1; rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov); cifs_small_buf_release(iov.iov_base); if (rc) { cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE); goto qfsinf_exit; } rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base; info = (struct smb2_fs_full_size_info *)( le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp); rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset), le32_to_cpu(rsp->OutputBufferLength), &rsp_iov, sizeof(struct smb2_fs_full_size_info)); if (!rc) smb2_copy_fs_info_to_kstatfs(info, fsdata); qfsinf_exit: free_rsp_buf(resp_buftype, rsp_iov.iov_base); return rc; } int SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, int level) { struct smb_rqst rqst; struct smb2_query_info_rsp *rsp = NULL; struct kvec iov; struct kvec rsp_iov; int rc = 0; int resp_buftype, max_len, min_len; struct cifs_ses *ses = tcon->ses; unsigned int rsp_len, offset; int flags = 0; if (level == FS_DEVICE_INFORMATION) { max_len = sizeof(FILE_SYSTEM_DEVICE_INFO); min_len = sizeof(FILE_SYSTEM_DEVICE_INFO); } else if (level == FS_ATTRIBUTE_INFORMATION) { max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO); min_len = MIN_FS_ATTR_INFO_SIZE; } else if (level == FS_SECTOR_SIZE_INFORMATION) { max_len = sizeof(struct smb3_fs_ss_info); min_len = sizeof(struct smb3_fs_ss_info); } else if (level == FS_VOLUME_INFORMATION) { max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN; min_len = sizeof(struct smb3_fs_vol_info); } else { cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level); return -EINVAL; } rc = build_qfs_info_req(&iov, tcon, level, max_len, persistent_fid, volatile_fid); if (rc) return rc; if (smb3_encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; memset(&rqst, 0, sizeof(struct smb_rqst)); rqst.rq_iov = &iov; rqst.rq_nvec = 1; rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov); cifs_small_buf_release(iov.iov_base); if (rc) { cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE); goto qfsattr_exit; } rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base; rsp_len = le32_to_cpu(rsp->OutputBufferLength); offset = le16_to_cpu(rsp->OutputBufferOffset); rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len); if (rc) goto qfsattr_exit; if (level == FS_ATTRIBUTE_INFORMATION) memcpy(&tcon->fsAttrInfo, offset + (char *)rsp, min_t(unsigned int, rsp_len, max_len)); else if (level == FS_DEVICE_INFORMATION) memcpy(&tcon->fsDevInfo, offset + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO)); else if (level == FS_SECTOR_SIZE_INFORMATION) { struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *) (offset + (char *)rsp); tcon->ss_flags = le32_to_cpu(ss_info->Flags); tcon->perf_sector_size = le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf); } else if (level == FS_VOLUME_INFORMATION) { struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *) (offset + (char *)rsp); tcon->vol_serial_number = vol_info->VolumeSerialNumber; tcon->vol_create_time = vol_info->VolumeCreationTime; } qfsattr_exit: free_rsp_buf(resp_buftype, rsp_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) { struct smb_rqst rqst; int rc = 0; struct smb2_lock_req *req = NULL; struct kvec iov[2]; struct kvec rsp_iov; int resp_buf_type; unsigned int count; int flags = CIFS_NO_RSP_BUF; unsigned int total_len; cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock); rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len); if (rc) return rc; if (smb3_encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; req->sync_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); iov[0].iov_base = (char *)req; iov[0].iov_len = total_len - sizeof(struct smb2_lock_element); iov[1].iov_base = (char *)buf; iov[1].iov_len = count; cifs_stats_inc(&tcon->stats.cifs_stats.num_locks); memset(&rqst, 0, sizeof(struct smb_rqst)); rqst.rq_iov = iov; rqst.rq_nvec = 2; rc = cifs_send_recv(xid, tcon->ses, &rqst, &resp_buf_type, flags, &rsp_iov); cifs_small_buf_release(req); if (rc) { cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc); cifs_stats_fail_inc(tcon, SMB2_LOCK_HE); trace_smb3_lock_err(xid, persist_fid, tcon->tid, tcon->ses->Suid, rc); } 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) { struct smb_rqst rqst; int rc; struct smb2_lease_ack *req = NULL; struct cifs_ses *ses = tcon->ses; int flags = CIFS_OBREAK_OP; unsigned int total_len; struct kvec iov[1]; struct kvec rsp_iov; int resp_buf_type; __u64 *please_key_high; __u64 *please_key_low; cifs_dbg(FYI, "SMB2_lease_break\n"); rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req, &total_len); if (rc) return rc; if (smb3_encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; req->sync_hdr.CreditRequest = cpu_to_le16(1); req->StructureSize = cpu_to_le16(36); total_len += 12; memcpy(req->LeaseKey, lease_key, 16); req->LeaseState = lease_state; flags |= CIFS_NO_RSP_BUF; iov[0].iov_base = (char *)req; iov[0].iov_len = total_len; memset(&rqst, 0, sizeof(struct smb_rqst)); rqst.rq_iov = iov; rqst.rq_nvec = 1; rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov); cifs_small_buf_release(req); please_key_low = (__u64 *)lease_key; please_key_high = (__u64 *)(lease_key+8); if (rc) { cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE); trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid, ses->Suid, *please_key_low, *please_key_high, rc); cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc); } else trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid, ses->Suid, *please_key_low, *please_key_high); return rc; }