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| author |   Steve French <stfrench@microsoft.com> | 2019-06-25 04:39:51 -0500 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2019-07-07 22:37:43 -0500 |
| commit | 96d3cca1241d6e56910b74435301e095705e1ebc (patch) | |
| tree | b57e925dc5f4490848b6cd7f15c8b431449d3185 /fs/cifs/smb2pdu.c | |
| parent | smb3: do not send compression info by default (diff) | |
| download | linux-dev-96d3cca1241d6e56910b74435301e095705e1ebc.tar.xz linux-dev-96d3cca1241d6e56910b74435301e095705e1ebc.zip | |
smb3: Send netname context during negotiate protocol
See MS-SMB2 2.2.3.1.4
Allows hostname to be used by load balancers
Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/cifs/smb2pdu.c')
| -rw-r--r-- | fs/cifs/smb2pdu.c | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index 8e289404f6b0..34d5397a1989 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -495,6 +495,21 @@ build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt) 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 + + (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) { @@ -559,9 +574,15 @@ assemble_neg_contexts(struct smb2_negotiate_req *req, 8) * 8; *total_len += ctxt_len; pneg_ctxt += ctxt_len; - req->NegotiateContextCount = cpu_to_le16(4); + req->NegotiateContextCount = cpu_to_le16(5); } else - req->NegotiateContextCount = cpu_to_le16(3); + 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); } |