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Subject[PATCH AUTOSEL 4.18 040/100] rxrpc: Fix checks as to whether we should set up a new call
Date
From: David Howells <dhowells@redhat.com>

[ Upstream commit dc71db34e4f3c06b8277c8f3c2ff014610607a8c ]

There's a check in rxrpc_data_ready() that's checking the CLIENT_INITIATED
flag in the packet type field rather than in the packet flags field.

Fix this by creating a pair of helper functions to check whether the packet
is going to the client or to the server and use them generally.

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>
---
net/rxrpc/ar-internal.h | 10 ++++++++++
net/rxrpc/conn_object.c | 2 +-
net/rxrpc/input.c | 12 ++++--------
3 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index 707630ab4713..5069193d2cc1 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -462,6 +462,16 @@ struct rxrpc_connection {
u8 out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
};

+static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp)
+{
+ return sp->hdr.flags & RXRPC_CLIENT_INITIATED;
+}
+
+static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp)
+{
+ return !rxrpc_to_server(sp);
+}
+
/*
* Flags in call->flags.
*/
diff --git a/net/rxrpc/conn_object.c b/net/rxrpc/conn_object.c
index 4c77a78a252a..c37bf8e282b9 100644
--- a/net/rxrpc/conn_object.c
+++ b/net/rxrpc/conn_object.c
@@ -99,7 +99,7 @@ struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *local,
k.epoch = sp->hdr.epoch;
k.cid = sp->hdr.cid & RXRPC_CIDMASK;

- if (sp->hdr.flags & RXRPC_CLIENT_INITIATED) {
+ if (rxrpc_to_server(sp)) {
/* We need to look up service connections by the full protocol
* parameter set. We look up the peer first as an intermediate
* step and then the connection from the peer's tree.
diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c
index 608d078a4981..338fbbf216a9 100644
--- a/net/rxrpc/input.c
+++ b/net/rxrpc/input.c
@@ -1171,10 +1171,6 @@ void rxrpc_data_ready(struct sock *udp_sk)

trace_rxrpc_rx_packet(sp);

- _net("Rx RxRPC %s ep=%x call=%x:%x",
- sp->hdr.flags & RXRPC_CLIENT_INITIATED ? "ToServer" : "ToClient",
- sp->hdr.epoch, sp->hdr.cid, sp->hdr.callNumber);
-
if (sp->hdr.type >= RXRPC_N_PACKET_TYPES ||
!((RXRPC_SUPPORTED_PACKET_TYPES >> sp->hdr.type) & 1)) {
_proto("Rx Bad Packet Type %u", sp->hdr.type);
@@ -1183,13 +1179,13 @@ void rxrpc_data_ready(struct sock *udp_sk)

switch (sp->hdr.type) {
case RXRPC_PACKET_TYPE_VERSION:
- if (!(sp->hdr.flags & RXRPC_CLIENT_INITIATED))
+ if (rxrpc_to_client(sp))
goto discard;
rxrpc_post_packet_to_local(local, skb);
goto out;

case RXRPC_PACKET_TYPE_BUSY:
- if (sp->hdr.flags & RXRPC_CLIENT_INITIATED)
+ if (rxrpc_to_server(sp))
goto discard;
/* Fall through */

@@ -1269,7 +1265,7 @@ void rxrpc_data_ready(struct sock *udp_sk)
call = rcu_dereference(chan->call);

if (sp->hdr.callNumber > chan->call_id) {
- if (!(sp->hdr.flags & RXRPC_CLIENT_INITIATED)) {
+ if (rxrpc_to_client(sp)) {
rcu_read_unlock();
goto reject_packet;
}
@@ -1292,7 +1288,7 @@ void rxrpc_data_ready(struct sock *udp_sk)
}

if (!call || atomic_read(&call->usage) == 0) {
- if (!(sp->hdr.type & RXRPC_CLIENT_INITIATED) ||
+ if (rxrpc_to_client(sp) ||
sp->hdr.callNumber == 0 ||
sp->hdr.type != RXRPC_PACKET_TYPE_DATA)
goto bad_message_unlock;
--
2.17.1
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