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authorDavid Howells <dhowells@redhat.com>2018-10-08 15:46:11 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-11-10 07:42:56 -0800
commit2daa0b5ec29630377c6d14b3d943e1c5c2a65577 (patch)
tree261ad63f22dc3e9fc7cea2c8437eb7045b9e4d09 /net/rxrpc
parentd9ec661f2dc887eb13a81a1d61538c5d3ed27a66 (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.c19
1 files changed, 10 insertions, 9 deletions
diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c
index 7bfde4737cb3..a4380e182e6c 100644
--- a/net/rxrpc/input.c
+++ b/net/rxrpc/input.c
@@ -808,6 +808,16 @@ 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)
@@ -829,15 +839,6 @@ 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);