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s3:smb2_server validate message ids with largemtu

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Signed-off-by: Jeremy Allison <jra@samba.org>
This commit is contained in:
Christian Ambach 2012-02-27 17:53:04 -08:00 committed by Jeremy Allison
parent f6afda0bc8
commit 6e8e3c4613
1 changed files with 55 additions and 26 deletions
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53
source3/smbd/smb2_server.c
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@ -306,6 +306,8 @@ static bool smb2_validate_message_id(struct smbd_server_connection *sconn,
struct bitmap *credits_bm = sconn->smb2.credits_bitmap;
uint16_t opcode = IVAL(inhdr, SMB2_HDR_OPCODE);
unsigned int bitmap_offset;
uint16_t credit_charge = 1;
uint64_t i;
if (opcode == SMB2_OP_CANCEL) {
/* SMB2_CANCEL requests by definition resend messageids. */
@ -325,27 +327,52 @@ static bool smb2_validate_message_id(struct smbd_server_connection *sconn,
if (sconn->smb2.credits_granted == 0) {
DEBUG(0,("smb2_validate_message_id: client used more "
"credits than granted message_id (%llu)\n",
"credits than granted, message_id (%llu)\n",
(unsigned long long)message_id));
return false;
}
/* client just used a credit. */
sconn->smb2.credits_granted -= 1;
if (sconn->smb2.supports_multicredit) {
credit_charge = IVAL(inhdr, SMB2_HDR_CREDIT_CHARGE);
credit_charge = MAX(credit_charge, 1);
}
/* Mark the message_id as seen in the bitmap. */
bitmap_offset = (unsigned int)(message_id %
(uint64_t)(sconn->smb2.max_credits * DEFAULT_SMB2_MAX_CREDIT_BITMAP_FACTOR));
if (bitmap_query(credits_bm, bitmap_offset)) {
DEBUG(0,("smb2_validate_message_id: duplicate message_id "
"%llu (bm offset %u)\n",
DEBUG(11, ("smb2_validate_message_id: mid %llu, credits_granted %llu, "
"charge %llu, max_credits %llu, seqnum_low: %llu\n",
(unsigned long long) message_id,
bitmap_offset));
(unsigned long long) sconn->smb2.credits_granted,
(unsigned long long) credit_charge,
(unsigned long long) sconn->smb2.max_credits,
(unsigned long long) sconn->smb2.seqnum_low));
/* substract used credits */
sconn->smb2.credits_granted -= credit_charge;
/*
* now check the message ids
*
* for multi-credit requests we need to check all current mid plus
* the implicit mids caused by the credit charge
* e.g. current mid = 15, charge 5 => mark 15-19 as used
*/
for (i = message_id; i <= (message_id+credit_charge-1); i++) {
DEBUG(11, ("Iterating mid %llu\n", (unsigned long long) i));
/* Mark the message_ids as seen in the bitmap. */
bitmap_offset = (unsigned int)(i %
(uint64_t)(sconn->smb2.max_credits *
DEFAULT_SMB2_MAX_CREDIT_BITMAP_FACTOR));
if (bitmap_query(credits_bm, bitmap_offset)) {
DEBUG(0,("smb2_validate_message_id: duplicate "
"message_id %llu (bm offset %u)\n",
(unsigned long long)i, bitmap_offset));
return false;
}
bitmap_set(credits_bm, bitmap_offset);
if (message_id == sconn->smb2.seqnum_low + 1) {
if (i == sconn->smb2.seqnum_low + 1) {
/* Move the window forward by all the message_id's
already seen. */
while (bitmap_query(credits_bm, bitmap_offset)) {
@ -356,7 +383,9 @@ static bool smb2_validate_message_id(struct smbd_server_connection *sconn,
bitmap_clear(credits_bm, bitmap_offset);
sconn->smb2.seqnum_low += 1;
bitmap_offset = (bitmap_offset + 1) %
(sconn->smb2.max_credits * DEFAULT_SMB2_MAX_CREDIT_BITMAP_FACTOR);
(sconn->smb2.max_credits *
DEFAULT_SMB2_MAX_CREDIT_BITMAP_FACTOR);
}
}
}