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rxrpc: Only take the rwind and mtu values from latest ACK 

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: 248f219cb8 ("rxrpc: Rewrite the data and ack handling code")
Signed-off-by: David Howells <dhowells@redhat.com>
hifive-unleashed-5.1
David Howells 2018-10-08 15:46:11 +01:00
parent dfe9952246
commit 298bc15b20
1 changed files with 10 additions and 9 deletions
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19
net/rxrpc/input.c
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@ -868,6 +868,16 @@ 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)
@ -889,15 +899,6 @@ 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);