diff options
| author | David Howells <dhowells@redhat.com> | 2018-10-08 15:46:11 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-11-04 14:52:46 +0100 |
| commit | f1d27ff6e027204e6bec8dd01153a196219d9d9b (patch) | |
| tree | 7a1bc5031295ed3c4ebdbbb5ffeb5affaa9558b6 /net/rxrpc | |
| parent | 9a6d45700adf03085add4ab26bcdca6ee2487a05 (diff) | |
rxrpc: Only take the rwind and mtu values from latest ACK
[ Upstream commit 298bc15b2079c324e82d0a6fda39c3d762af7282 ]
Move the out-of-order and duplicate ACK packet check to before the call to
rxrpc_input_ackinfo() so that the receive window size and MTU size are only
checked in the latest ACK packet and don't regress.
Fixes: 248f219cb8bc ("rxrpc: Rewrite the data and ack handling code")
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net/rxrpc')
| -rw-r--r-- | net/rxrpc/input.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c index 3a501bf0fc1a..ea506a77f3c8 100644 --- a/net/rxrpc/input.c +++ b/net/rxrpc/input.c @@ -806,6 +806,16 @@ static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb, rxrpc_propose_ack_respond_to_ack); } + /* Discard any out-of-order or duplicate ACKs. */ + if (before_eq(sp->hdr.serial, call->acks_latest)) { + _debug("discard ACK %d <= %d", + sp->hdr.serial, call->acks_latest); + return; + } + call->acks_latest_ts = skb->tstamp; + call->acks_latest = sp->hdr.serial; + + /* Parse rwind and mtu sizes if provided. */ ioffset = offset + nr_acks + 3; if (skb->len >= ioffset + sizeof(buf.info)) { if (skb_copy_bits(skb, ioffset, &buf.info, sizeof(buf.info)) < 0) @@ -827,15 +837,6 @@ static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb, return; } - /* Discard any out-of-order or duplicate ACKs. */ - if (before_eq(sp->hdr.serial, call->acks_latest)) { - _debug("discard ACK %d <= %d", - sp->hdr.serial, call->acks_latest); - return; - } - call->acks_latest_ts = skb->tstamp; - call->acks_latest = sp->hdr.serial; - if (before(hard_ack, call->tx_hard_ack) || after(hard_ack, call->tx_top)) return rxrpc_proto_abort("AKW", call, 0); |