From patchwork Tue Feb 28 18:40:28 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?q?Aur=C3=A9lien_Aptel?= X-Patchwork-Id: 9596541 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 404C56058A for ; Tue, 28 Feb 2017 18:42:58 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 31ADF28536 for ; Tue, 28 Feb 2017 18:42:58 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 25BFA2855C; Tue, 28 Feb 2017 18:42:58 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 32E782855E for ; Tue, 28 Feb 2017 18:42:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751678AbdB1Smz (ORCPT ); Tue, 28 Feb 2017 13:42:55 -0500 Received: from smtp.nue.novell.com ([195.135.221.5]:49281 "EHLO smtp.nue.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751776AbdB1SmZ (ORCPT ); Tue, 28 Feb 2017 13:42:25 -0500 Received: from emea4-mta.ukb.novell.com ([10.120.13.87]) by smtp.nue.novell.com with ESMTP (TLS encrypted); Tue, 28 Feb 2017 19:40:54 +0100 Received: from localhost (nwb-a10-snat.microfocus.com [10.120.13.202]) by emea4-mta.ukb.novell.com with ESMTP (TLS encrypted); Tue, 28 Feb 2017 18:40:48 +0000 From: Aurelien Aptel To: linux-cifs@vger.kernel.org Cc: Aurelien Aptel Subject: [PATCH v3 1/7] CIFS: move DFS response parsing out of SMB1 code Date: Tue, 28 Feb 2017 19:40:28 +0100 Message-Id: <20170228184034.18771-2-aaptel@suse.com> X-Mailer: git-send-email 2.10.2 In-Reply-To: <20170228184034.18771-1-aaptel@suse.com> References: <20170228184034.18771-1-aaptel@suse.com> Sender: linux-cifs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP since the DFS payload is not tied to the SMB version we can: * isolate the DFS payload in its own struct, and include that struct in packet structs * move the function that parses the response to misc.c and make it work on the new DFS payload struct (add payload size and utf16 flag as a result). Signed-off-by: Aurelien Aptel Acked-by: Pavel Shilovsky --- fs/cifs/cifspdu.h | 16 ++++--- fs/cifs/cifsproto.h | 5 +++ fs/cifs/cifssmb.c | 119 +++------------------------------------------------- fs/cifs/misc.c | 105 ++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 125 insertions(+), 120 deletions(-) diff --git a/fs/cifs/cifspdu.h b/fs/cifs/cifspdu.h index f5b8730..1ce733f 100644 --- a/fs/cifs/cifspdu.h +++ b/fs/cifs/cifspdu.h @@ -2086,17 +2086,21 @@ typedef struct dfs_referral_level_3 { /* version 4 is same, + one flag bit */ __u8 ServiceSiteGuid[16]; /* MBZ, ignored */ } __attribute__((packed)) REFERRAL3; -typedef struct smb_com_transaction_get_dfs_refer_rsp { - struct smb_hdr hdr; /* wct = 10 */ - struct trans2_resp t2; - __u16 ByteCount; - __u8 Pad; +struct get_dfs_referral_rsp { __le16 PathConsumed; __le16 NumberOfReferrals; __le32 DFSFlags; REFERRAL3 referrals[1]; /* array of level 3 dfs_referral structures */ /* followed by the strings pointed to by the referral structures */ -} __attribute__((packed)) TRANSACTION2_GET_DFS_REFER_RSP; +} __packed; + +typedef struct smb_com_transaction_get_dfs_refer_rsp { + struct smb_hdr hdr; /* wct = 10 */ + struct trans2_resp t2; + __u16 ByteCount; + __u8 Pad; + struct get_dfs_referral_rsp dfs_data; +} __packed TRANSACTION2_GET_DFS_REFER_RSP; /* DFS Flags */ #define DFSREF_REFERRAL_SERVER 0x00000001 /* all targets are DFS roots */ diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h index 406d2c1..c097830 100644 --- a/fs/cifs/cifsproto.h +++ b/fs/cifs/cifsproto.h @@ -284,6 +284,11 @@ extern int get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const struct nls_table *nls_codepage, unsigned int *num_referrals, struct dfs_info3_param **referrals, int remap); +extern int parse_dfs_referrals(struct get_dfs_referral_rsp *rsp, u32 rsp_size, + unsigned int *num_of_nodes, + struct dfs_info3_param **target_nodes, + const struct nls_table *nls_codepage, int remap, + const char *searchName, bool is_unicode); extern void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon, struct cifs_sb_info *cifs_sb, struct smb_vol *vol); diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c index f5099fb..5005c79 100644 --- a/fs/cifs/cifssmb.c +++ b/fs/cifs/cifssmb.c @@ -4786,117 +4786,6 @@ CIFSGetSrvInodeNumber(const unsigned int xid, struct cifs_tcon *tcon, return rc; } -/* parses DFS refferal V3 structure - * caller is responsible for freeing target_nodes - * returns: - * on success - 0 - * on failure - errno - */ -static int -parse_DFS_referrals(TRANSACTION2_GET_DFS_REFER_RSP *pSMBr, - unsigned int *num_of_nodes, - struct dfs_info3_param **target_nodes, - const struct nls_table *nls_codepage, int remap, - const char *searchName) -{ - int i, rc = 0; - char *data_end; - bool is_unicode; - struct dfs_referral_level_3 *ref; - - if (pSMBr->hdr.Flags2 & SMBFLG2_UNICODE) - is_unicode = true; - else - is_unicode = false; - *num_of_nodes = le16_to_cpu(pSMBr->NumberOfReferrals); - - if (*num_of_nodes < 1) { - cifs_dbg(VFS, "num_referrals: must be at least > 0, but we get num_referrals = %d\n", - *num_of_nodes); - rc = -EINVAL; - goto parse_DFS_referrals_exit; - } - - ref = (struct dfs_referral_level_3 *) &(pSMBr->referrals); - if (ref->VersionNumber != cpu_to_le16(3)) { - cifs_dbg(VFS, "Referrals of V%d version are not supported, should be V3\n", - le16_to_cpu(ref->VersionNumber)); - rc = -EINVAL; - goto parse_DFS_referrals_exit; - } - - /* get the upper boundary of the resp buffer */ - data_end = (char *)(&(pSMBr->PathConsumed)) + - le16_to_cpu(pSMBr->t2.DataCount); - - cifs_dbg(FYI, "num_referrals: %d dfs flags: 0x%x ...\n", - *num_of_nodes, le32_to_cpu(pSMBr->DFSFlags)); - - *target_nodes = kcalloc(*num_of_nodes, sizeof(struct dfs_info3_param), - GFP_KERNEL); - if (*target_nodes == NULL) { - rc = -ENOMEM; - goto parse_DFS_referrals_exit; - } - - /* collect necessary data from referrals */ - for (i = 0; i < *num_of_nodes; i++) { - char *temp; - int max_len; - struct dfs_info3_param *node = (*target_nodes)+i; - - node->flags = le32_to_cpu(pSMBr->DFSFlags); - if (is_unicode) { - __le16 *tmp = kmalloc(strlen(searchName)*2 + 2, - GFP_KERNEL); - if (tmp == NULL) { - rc = -ENOMEM; - goto parse_DFS_referrals_exit; - } - cifsConvertToUTF16((__le16 *) tmp, searchName, - PATH_MAX, nls_codepage, remap); - node->path_consumed = cifs_utf16_bytes(tmp, - le16_to_cpu(pSMBr->PathConsumed), - nls_codepage); - kfree(tmp); - } else - node->path_consumed = le16_to_cpu(pSMBr->PathConsumed); - - node->server_type = le16_to_cpu(ref->ServerType); - node->ref_flag = le16_to_cpu(ref->ReferralEntryFlags); - - /* copy DfsPath */ - temp = (char *)ref + le16_to_cpu(ref->DfsPathOffset); - max_len = data_end - temp; - node->path_name = cifs_strndup_from_utf16(temp, max_len, - is_unicode, nls_codepage); - if (!node->path_name) { - rc = -ENOMEM; - goto parse_DFS_referrals_exit; - } - - /* copy link target UNC */ - temp = (char *)ref + le16_to_cpu(ref->NetworkAddressOffset); - max_len = data_end - temp; - node->node_name = cifs_strndup_from_utf16(temp, max_len, - is_unicode, nls_codepage); - if (!node->node_name) { - rc = -ENOMEM; - goto parse_DFS_referrals_exit; - } - - ref++; - } - -parse_DFS_referrals_exit: - if (rc) { - free_dfs_info_array(*target_nodes, *num_of_nodes); - *target_nodes = NULL; - *num_of_nodes = 0; - } - return rc; -} - int CIFSGetDFSRefer(const unsigned int xid, struct cifs_ses *ses, const char *search_name, struct dfs_info3_param **target_nodes, @@ -4993,9 +4882,11 @@ CIFSGetDFSRefer(const unsigned int xid, struct cifs_ses *ses, get_bcc(&pSMBr->hdr), le16_to_cpu(pSMBr->t2.DataOffset)); /* parse returned result into more usable form */ - rc = parse_DFS_referrals(pSMBr, num_of_nodes, - target_nodes, nls_codepage, remap, - search_name); + rc = parse_dfs_referrals(&pSMBr->dfs_data, + le16_to_cpu(pSMBr->t2.DataCount), + num_of_nodes, target_nodes, nls_codepage, + remap, search_name, + pSMBr->hdr.Flags2 & SMBFLG2_UNICODE); GetDFSRefExit: cifs_buf_release(pSMB); diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c index c672915..d3fb115 100644 --- a/fs/cifs/misc.c +++ b/fs/cifs/misc.c @@ -640,3 +640,108 @@ cifs_add_pending_open(struct cifs_fid *fid, struct tcon_link *tlink, cifs_add_pending_open_locked(fid, tlink, open); spin_unlock(&tlink_tcon(open->tlink)->open_file_lock); } + +/* parses DFS refferal V3 structure + * caller is responsible for freeing target_nodes + * returns: + * - on success - 0 + * - on failure - errno + */ +int +parse_dfs_referrals(struct get_dfs_referral_rsp *rsp, u32 rsp_size, + unsigned int *num_of_nodes, + struct dfs_info3_param **target_nodes, + const struct nls_table *nls_codepage, int remap, + const char *searchName, bool is_unicode) +{ + int i, rc = 0; + char *data_end; + struct dfs_referral_level_3 *ref; + + *num_of_nodes = le16_to_cpu(rsp->NumberOfReferrals); + + if (*num_of_nodes < 1) { + cifs_dbg(VFS, "num_referrals: must be at least > 0, but we get num_referrals = %d\n", + *num_of_nodes); + rc = -EINVAL; + goto parse_DFS_referrals_exit; + } + + ref = (struct dfs_referral_level_3 *) &(rsp->referrals); + if (ref->VersionNumber != cpu_to_le16(3)) { + cifs_dbg(VFS, "Referrals of V%d version are not supported, should be V3\n", + le16_to_cpu(ref->VersionNumber)); + rc = -EINVAL; + goto parse_DFS_referrals_exit; + } + + /* get the upper boundary of the resp buffer */ + data_end = (char *)rsp + rsp_size; + + cifs_dbg(FYI, "num_referrals: %d dfs flags: 0x%x ...\n", + *num_of_nodes, le32_to_cpu(rsp->DFSFlags)); + + *target_nodes = kcalloc(*num_of_nodes, sizeof(struct dfs_info3_param), + GFP_KERNEL); + if (*target_nodes == NULL) { + rc = -ENOMEM; + goto parse_DFS_referrals_exit; + } + + /* collect necessary data from referrals */ + for (i = 0; i < *num_of_nodes; i++) { + char *temp; + int max_len; + struct dfs_info3_param *node = (*target_nodes)+i; + + node->flags = le32_to_cpu(rsp->DFSFlags); + if (is_unicode) { + __le16 *tmp = kmalloc(strlen(searchName)*2 + 2, + GFP_KERNEL); + if (tmp == NULL) { + rc = -ENOMEM; + goto parse_DFS_referrals_exit; + } + cifsConvertToUTF16((__le16 *) tmp, searchName, + PATH_MAX, nls_codepage, remap); + node->path_consumed = cifs_utf16_bytes(tmp, + le16_to_cpu(rsp->PathConsumed), + nls_codepage); + kfree(tmp); + } else + node->path_consumed = le16_to_cpu(rsp->PathConsumed); + + node->server_type = le16_to_cpu(ref->ServerType); + node->ref_flag = le16_to_cpu(ref->ReferralEntryFlags); + + /* copy DfsPath */ + temp = (char *)ref + le16_to_cpu(ref->DfsPathOffset); + max_len = data_end - temp; + node->path_name = cifs_strndup_from_utf16(temp, max_len, + is_unicode, nls_codepage); + if (!node->path_name) { + rc = -ENOMEM; + goto parse_DFS_referrals_exit; + } + + /* copy link target UNC */ + temp = (char *)ref + le16_to_cpu(ref->NetworkAddressOffset); + max_len = data_end - temp; + node->node_name = cifs_strndup_from_utf16(temp, max_len, + is_unicode, nls_codepage); + if (!node->node_name) { + rc = -ENOMEM; + goto parse_DFS_referrals_exit; + } + + ref++; + } + +parse_DFS_referrals_exit: + if (rc) { + free_dfs_info_array(*target_nodes, *num_of_nodes); + *target_nodes = NULL; + *num_of_nodes = 0; + } + return rc; +}