diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index 678e638c1e6944d8c4aa763c7b189d4170784dd6..48f7c197cd2d057e1991bea0ed52595e64fe5bb3 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -64,8 +64,8 @@ #define RFC1001_NAME_LEN 15 #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1) -/* currently length of NIP6_FMT */ -#define SERVER_NAME_LENGTH 40 +/* maximum length of ip addr as a string (including ipv6 and sctp) */ +#define SERVER_NAME_LENGTH 80 #define SERVER_NAME_LEN_WITH_NULL (SERVER_NAME_LENGTH + 1) /* echo interval in seconds */ @@ -833,12 +833,12 @@ static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net) struct cifs_ses { struct list_head smb_ses_list; struct list_head tcon_list; + struct cifs_tcon *tcon_ipc; struct mutex session_mutex; struct TCP_Server_Info *server; /* pointer to server info */ int ses_count; /* reference counter */ enum statusEnum status; unsigned overrideSecFlg; /* if non-zero override global sec flags */ - __u32 ipc_tid; /* special tid for connection to IPC share */ char *serverOS; /* name of operating system underlying server */ char *serverNOS; /* name of network operating system of server */ char *serverDomain; /* security realm of server */ @@ -846,8 +846,7 @@ struct cifs_ses { kuid_t linux_uid; /* overriding owner of files on the mount */ kuid_t cred_uid; /* owner of credentials */ unsigned int capabilities; - char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for - TCP names - will ipv6 and sctp addresses fit? */ + char serverName[SERVER_NAME_LEN_WITH_NULL]; char *user_name; /* must not be null except during init of sess and after mount option parsing we fill it */ char *domainName; @@ -942,7 +941,9 @@ struct cifs_tcon { FILE_SYSTEM_DEVICE_INFO fsDevInfo; FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */ FILE_SYSTEM_UNIX_INFO fsUnixInfo; - bool ipc:1; /* set if connection to IPC$ eg for RPC/PIPES */ + bool ipc:1; /* set if connection to IPC$ share (always also pipe) */ + bool pipe:1; /* set if connection to pipe share */ + bool print:1; /* set if connection to printer share */ bool retry:1; bool nocase:1; bool seal:1; /* transport encryption for this mounted share */ @@ -955,7 +956,6 @@ struct cifs_tcon { bool need_reopen_files:1; /* need to reopen tcon file handles */ bool use_resilient:1; /* use resilient instead of durable handles */ bool use_persistent:1; /* use persistent instead of durable handles */ - bool print:1; /* set if connection to printer share */ __le32 capabilities; __u32 share_flags; __u32 maximal_access; diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c index 49cf999f3d466a6f5ab4bc7acb49f4083c76d659..4e0922d24eb216d3549e6a09958825de7616b51e 100644 --- a/fs/cifs/cifssmb.c +++ b/fs/cifs/cifssmb.c @@ -4833,10 +4833,11 @@ CIFSGetDFSRefer(const unsigned int xid, struct cifs_ses *ses, *target_nodes = NULL; cifs_dbg(FYI, "In GetDFSRefer the path %s\n", search_name); - if (ses == NULL) + if (ses == NULL || ses->tcon_ipc == NULL) return -ENODEV; + getDFSRetry: - rc = smb_init(SMB_COM_TRANSACTION2, 15, NULL, (void **) &pSMB, + rc = smb_init(SMB_COM_TRANSACTION2, 15, ses->tcon_ipc, (void **) &pSMB, (void **) &pSMBr); if (rc) return rc; @@ -4844,7 +4845,7 @@ CIFSGetDFSRefer(const unsigned int xid, struct cifs_ses *ses, /* server pointer checked in called function, but should never be null here anyway */ pSMB->hdr.Mid = get_next_mid(ses->server); - pSMB->hdr.Tid = ses->ipc_tid; + pSMB->hdr.Tid = ses->tcon_ipc->tid; pSMB->hdr.Uid = ses->Suid; if (ses->capabilities & CAP_STATUS32) pSMB->hdr.Flags2 |= SMBFLG2_ERR_STATUS; diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 63c5d85fe25ef709d5d2a7eb8c0834aa92b7e275..8b5e401f547af29d6191c1f4c218ea9cc223d5ed 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -354,11 +354,12 @@ cifs_reconnect(struct TCP_Server_Info *server) list_for_each(tmp, &server->smb_ses_list) { ses = list_entry(tmp, struct cifs_ses, smb_ses_list); ses->need_reconnect = true; - ses->ipc_tid = 0; list_for_each(tmp2, &ses->tcon_list) { tcon = list_entry(tmp2, struct cifs_tcon, tcon_list); tcon->need_reconnect = true; } + if (ses->tcon_ipc) + ses->tcon_ipc->need_reconnect = true; } spin_unlock(&cifs_tcp_ses_lock); @@ -2426,6 +2427,93 @@ static int match_session(struct cifs_ses *ses, struct smb_vol *vol) return 1; } +/** + * cifs_setup_ipc - helper to setup the IPC tcon for the session + * + * A new IPC connection is made and stored in the session + * tcon_ipc. The IPC tcon has the same lifetime as the session. + */ +static int +cifs_setup_ipc(struct cifs_ses *ses, struct smb_vol *volume_info) +{ + int rc = 0, xid; + struct cifs_tcon *tcon; + struct nls_table *nls_codepage; + char unc[SERVER_NAME_LENGTH + sizeof("//x/IPC$")] = {0}; + bool seal = false; + + /* + * If the mount request that resulted in the creation of the + * session requires encryption, force IPC to be encrypted too. + */ + if (volume_info->seal) { + if (ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION) + seal = true; + else { + cifs_dbg(VFS, + "IPC: server doesn't support encryption\n"); + return -EOPNOTSUPP; + } + } + + tcon = tconInfoAlloc(); + if (tcon == NULL) + return -ENOMEM; + + snprintf(unc, sizeof(unc), "\\\\%s\\IPC$", ses->serverName); + + /* cannot fail */ + nls_codepage = load_nls_default(); + + xid = get_xid(); + tcon->ses = ses; + tcon->ipc = true; + tcon->seal = seal; + rc = ses->server->ops->tree_connect(xid, ses, unc, tcon, nls_codepage); + free_xid(xid); + + if (rc) { + cifs_dbg(VFS, "failed to connect to IPC (rc=%d)\n", rc); + tconInfoFree(tcon); + goto out; + } + + cifs_dbg(FYI, "IPC tcon rc = %d ipc tid = %d\n", rc, tcon->tid); + + ses->tcon_ipc = tcon; +out: + unload_nls(nls_codepage); + return rc; +} + +/** + * cifs_free_ipc - helper to release the session IPC tcon + * + * Needs to be called everytime a session is destroyed + */ +static int +cifs_free_ipc(struct cifs_ses *ses) +{ + int rc = 0, xid; + struct cifs_tcon *tcon = ses->tcon_ipc; + + if (tcon == NULL) + return 0; + + if (ses->server->ops->tree_disconnect) { + xid = get_xid(); + rc = ses->server->ops->tree_disconnect(xid, tcon); + free_xid(xid); + } + + if (rc) + cifs_dbg(FYI, "failed to disconnect IPC tcon (rc=%d)\n", rc); + + tconInfoFree(tcon); + ses->tcon_ipc = NULL; + return rc; +} + static struct cifs_ses * cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol) { @@ -2466,6 +2554,8 @@ cifs_put_smb_ses(struct cifs_ses *ses) ses->status = CifsExiting; spin_unlock(&cifs_tcp_ses_lock); + cifs_free_ipc(ses); + if (ses->status == CifsExiting && server->ops->logoff) { xid = get_xid(); rc = server->ops->logoff(xid, ses); @@ -2710,6 +2800,9 @@ cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info) spin_unlock(&cifs_tcp_ses_lock); free_xid(xid); + + cifs_setup_ipc(ses, volume_info); + return ses; get_ses_fail: @@ -2754,8 +2847,16 @@ void cifs_put_tcon(struct cifs_tcon *tcon) { unsigned int xid; - struct cifs_ses *ses = tcon->ses; + struct cifs_ses *ses; + /* + * IPC tcon share the lifetime of their session and are + * destroyed in the session put function + */ + if (tcon == NULL || tcon->ipc) + return; + + ses = tcon->ses; cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count); spin_lock(&cifs_tcp_ses_lock); if (--tcon->tc_count > 0) { @@ -3031,39 +3132,17 @@ get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path, const struct nls_table *nls_codepage, unsigned int *num_referrals, struct dfs_info3_param **referrals, int remap) { - char *temp_unc; int rc = 0; - if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer) + if (!ses->server->ops->get_dfs_refer) return -ENOSYS; *num_referrals = 0; *referrals = NULL; - if (ses->ipc_tid == 0) { - temp_unc = kmalloc(2 /* for slashes */ + - strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2) - + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL); - if (temp_unc == NULL) - return -ENOMEM; - temp_unc[0] = '\\'; - temp_unc[1] = '\\'; - strcpy(temp_unc + 2, ses->serverName); - strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$"); - rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL, - nls_codepage); - cifs_dbg(FYI, "Tcon rc = %d ipc_tid = %d\n", rc, ses->ipc_tid); - kfree(temp_unc); - } - if (rc == 0) - rc = ses->server->ops->get_dfs_refer(xid, ses, old_path, - referrals, num_referrals, - nls_codepage, remap); - /* - * BB - map targetUNCs to dfs_info3 structures, here or in - * ses->server->ops->get_dfs_refer. - */ - + rc = ses->server->ops->get_dfs_refer(xid, ses, old_path, + referrals, num_referrals, + nls_codepage, remap); return rc; } @@ -3828,7 +3907,7 @@ cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info) tcon->unix_ext = 0; /* server does not support them */ /* do not care if a following call succeed - informational */ - if (!tcon->ipc && server->ops->qfs_tcon) + if (!tcon->pipe && server->ops->qfs_tcon) server->ops->qfs_tcon(xid, tcon); cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info); @@ -3958,8 +4037,7 @@ cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info) } /* - * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon - * pointer may be NULL. + * Issue a TREE_CONNECT request. */ int CIFSTCon(const unsigned int xid, struct cifs_ses *ses, @@ -3995,7 +4073,7 @@ CIFSTCon(const unsigned int xid, struct cifs_ses *ses, pSMB->AndXCommand = 0xFF; pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO); bcc_ptr = &pSMB->Password[0]; - if (!tcon || (ses->server->sec_mode & SECMODE_USER)) { + if (tcon->pipe || (ses->server->sec_mode & SECMODE_USER)) { pSMB->PasswordLength = cpu_to_le16(1); /* minimum */ *bcc_ptr = 0; /* password is null byte */ bcc_ptr++; /* skip password */ @@ -4067,7 +4145,7 @@ CIFSTCon(const unsigned int xid, struct cifs_ses *ses, 0); /* above now done in SendReceive */ - if ((rc == 0) && (tcon != NULL)) { + if (rc == 0) { bool is_unicode; tcon->tidStatus = CifsGood; @@ -4087,7 +4165,8 @@ CIFSTCon(const unsigned int xid, struct cifs_ses *ses, if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') && (bcc_ptr[2] == 'C')) { cifs_dbg(FYI, "IPC connection\n"); - tcon->ipc = 1; + tcon->ipc = true; + tcon->pipe = true; } } else if (length == 2) { if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) { @@ -4114,9 +4193,6 @@ CIFSTCon(const unsigned int xid, struct cifs_ses *ses, else tcon->Flags = 0; cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags); - } else if ((rc == 0) && tcon == NULL) { - /* all we need to save for IPC$ connection */ - ses->ipc_tid = smb_buffer_response->Tid; } cifs_buf_release(smb_buffer); diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c index ecb99079363ab7a85c0cdf7496f76061fa43a6e4..8f9a8cc7cc62558e71ef5896abf05437895979a3 100644 --- a/fs/cifs/inode.c +++ b/fs/cifs/inode.c @@ -1049,7 +1049,7 @@ struct inode *cifs_root_iget(struct super_block *sb) tcon->resource_id = CIFS_I(inode)->uniqueid; #endif - if (rc && tcon->ipc) { + if (rc && tcon->pipe) { cifs_dbg(FYI, "ipc connection - fake read inode\n"); spin_lock(&inode->i_lock); inode->i_mode |= S_IFDIR; diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index 7900aec7f92f545d76bd1571d25c65551922872d..2943adc754e4aa69f79f11ef68d4fd986e97897c 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -1258,8 +1258,7 @@ SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree, } /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */ - if (tcon) - tcon->tid = 0; + tcon->tid = 0; rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req, &total_len); @@ -1268,15 +1267,7 @@ SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree, return rc; } - if (tcon == NULL) { - if ((ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)) - flags |= CIFS_TRANSFORM_REQ; - - /* since no tcon, smb2_init can not do this, so do here */ - req->sync_hdr.SessionId = ses->Suid; - if (ses->server->sign) - req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED; - } else if (encryption_required(tcon)) + if (encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; iov[0].iov_base = (char *)req; @@ -1302,21 +1293,16 @@ SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree, goto tcon_error_exit; } - if (tcon == NULL) { - ses->ipc_tid = rsp->hdr.sync_hdr.TreeId; - goto tcon_exit; - } - switch (rsp->ShareType) { case SMB2_SHARE_TYPE_DISK: cifs_dbg(FYI, "connection to disk share\n"); break; case SMB2_SHARE_TYPE_PIPE: - tcon->ipc = true; + tcon->pipe = true; cifs_dbg(FYI, "connection to pipe share\n"); break; case SMB2_SHARE_TYPE_PRINT: - tcon->ipc = true; + tcon->print = true; cifs_dbg(FYI, "connection to printer\n"); break; default: @@ -1892,16 +1878,6 @@ SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, if (rc) return rc; - if (use_ipc) { - if (ses->ipc_tid == 0) { - cifs_small_buf_release(req); - return -ENOTCONN; - } - - cifs_dbg(FYI, "replacing tid 0x%x with IPC tid 0x%x\n", - req->sync_hdr.TreeId, ses->ipc_tid); - req->sync_hdr.TreeId = ses->ipc_tid; - } if (encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; @@ -2317,6 +2293,10 @@ void smb2_reconnect_server(struct work_struct *work) tcon_exist = true; } } + if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) { + list_add_tail(&ses->tcon_ipc->rlist, &tmp_list); + tcon_exist = true; + } } /* * Get the reference to server struct to be sure that the last call of