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smb3: add support for posix negotiate context

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Unlike CIFS where UNIX/POSIX extensions had been negotiatable,
SMB3 did not have POSIX extensions yet.  Add the new SMB3.11
POSIX negotiate context to ask the server whether it can
support POSIX (and thus whether we can send the new POSIX open
context).

Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Steve French
2018-05-19 20:45:27 -05:00
parent f92a720ee9
commit fcef0db6d6
4 changed files with 36 additions and 6 deletions
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29
fs/cifs/smb2pdu.c
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@@ -368,6 +368,7 @@ smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
#define SMB2_PREAUTH_INTEGRITY_CAPABILITIES cpu_to_le16(1)
#define SMB2_ENCRYPTION_CAPABILITIES cpu_to_le16(2)
#define SMB2_POSIX_EXTENSIONS_AVAILABLE cpu_to_le16(0x100)
static void
build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
@@ -390,22 +391,36 @@ build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_CCM;
}
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);
}
static void
assemble_neg_contexts(struct smb2_negotiate_req *req,
unsigned int *total_len)
{
char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT;
unsigned int ctxt_len;
*total_len += 2; /* Add 2 due to round to 8 byte boundary for 1st ctxt */
build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
/* Add 2 to size to round to 8 byte boundary */
ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
*total_len += ctxt_len;
pneg_ctxt += ctxt_len;
pneg_ctxt += 2 + sizeof(struct smb2_preauth_neg_context);
build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
req->NegotiateContextCount = cpu_to_le16(2);
ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
*total_len += ctxt_len;
pneg_ctxt += ctxt_len;
*total_len += 4 + sizeof(struct smb2_preauth_neg_context)
+ sizeof(struct smb2_encryption_neg_context);
build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
*total_len += sizeof(struct smb2_posix_neg_context);
req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
req->NegotiateContextCount = cpu_to_le16(3);
}
static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
@@ -488,6 +503,8 @@ static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
rc = decode_encrypt_ctx(server,
(struct smb2_encryption_neg_context *)pctx);
else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
server->posix_ext_supported = true;
else
cifs_dbg(VFS, "unknown negcontext of type %d ignored\n",
le16_to_cpu(pctx->ContextType));