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Message-ID: <146729594992.26306.7455044215916160739.stgit@warthog.procyon.org.uk>
Date: Thu, 30 Jun 2016 15:12:29 +0100
From: David Howells <dhowells@...hat.com>
To: davem@...emloft.net
Cc: dhowells@...hat.com, netdev@...r.kernel.org,
linux-afs@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 15/19] rxrpc: Move peer lookup from call-accept to
new-incoming-conn
Move the lookup of a peer from a call that's being accepted into the
function that creates a new incoming connection. This will allow us to
avoid incrementing the peer's usage count in some cases in future.
Note that I haven't bother to integrate rxrpc_get_addr_from_skb() with
rxrpc_extract_addr_from_skb() as I'm going to delete the former in the very
near future.
Signed-off-by: David Howells <dhowells@...hat.com>
---
net/rxrpc/ar-internal.h | 3 ++-
net/rxrpc/call_accept.c | 31 +++++++------------------------
net/rxrpc/conn_service.c | 11 ++++++++++-
net/rxrpc/utils.c | 32 ++++++++++++++++++++++++++++++++
4 files changed, 51 insertions(+), 26 deletions(-)
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index 2495c4facf51..7d87cace0177 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -609,7 +609,7 @@ static inline void rxrpc_queue_conn(struct rxrpc_connection *conn)
* conn_service.c
*/
struct rxrpc_connection *rxrpc_incoming_connection(struct rxrpc_local *,
- struct rxrpc_peer *,
+ struct sockaddr_rxrpc *,
struct sk_buff *);
/*
@@ -775,6 +775,7 @@ static inline void rxrpc_sysctl_exit(void) {}
*/
void rxrpc_get_addr_from_skb(struct rxrpc_local *, const struct sk_buff *,
struct sockaddr_rxrpc *);
+int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
/*
* debug tracing
diff --git a/net/rxrpc/call_accept.c b/net/rxrpc/call_accept.c
index 5367dbe9b96f..0b2832141bd0 100644
--- a/net/rxrpc/call_accept.c
+++ b/net/rxrpc/call_accept.c
@@ -75,7 +75,6 @@ static int rxrpc_accept_incoming_call(struct rxrpc_local *local,
{
struct rxrpc_connection *conn;
struct rxrpc_skb_priv *sp, *nsp;
- struct rxrpc_peer *peer;
struct rxrpc_call *call;
struct sk_buff *notification;
int ret;
@@ -94,15 +93,7 @@ static int rxrpc_accept_incoming_call(struct rxrpc_local *local,
rxrpc_new_skb(notification);
notification->mark = RXRPC_SKB_MARK_NEW_CALL;
- peer = rxrpc_lookup_peer(local, srx, GFP_NOIO);
- if (!peer) {
- _debug("no peer");
- ret = -EBUSY;
- goto error;
- }
-
- conn = rxrpc_incoming_connection(local, peer, skb);
- rxrpc_put_peer(peer);
+ conn = rxrpc_incoming_connection(local, srx, skb);
if (IS_ERR(conn)) {
_debug("no conn");
ret = PTR_ERR(conn);
@@ -226,20 +217,8 @@ void rxrpc_accept_incoming_calls(struct rxrpc_local *local)
whdr._rsvd = 0;
whdr.serviceId = htons(sp->hdr.serviceId);
- /* determine the remote address */
- memset(&srx, 0, sizeof(srx));
- srx.srx_family = AF_RXRPC;
- srx.transport.family = local->srx.transport.family;
- srx.transport_type = local->srx.transport_type;
- switch (srx.transport.family) {
- case AF_INET:
- srx.transport_len = sizeof(struct sockaddr_in);
- srx.transport.sin.sin_port = udp_hdr(skb)->source;
- srx.transport.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
- break;
- default:
- goto busy;
- }
+ if (rxrpc_extract_addr_from_skb(&srx, skb) < 0)
+ goto drop;
/* get the socket providing the service */
read_lock_bh(&local->services_lock);
@@ -285,6 +264,10 @@ busy:
rxrpc_free_skb(skb);
return;
+drop:
+ rxrpc_free_skb(skb);
+ return;
+
invalid_service:
skb->priority = RX_INVALID_OPERATION;
rxrpc_reject_packet(local, skb);
diff --git a/net/rxrpc/conn_service.c b/net/rxrpc/conn_service.c
index 2536d5276f67..3f0242423a66 100644
--- a/net/rxrpc/conn_service.c
+++ b/net/rxrpc/conn_service.c
@@ -16,11 +16,12 @@
* get a record of an incoming connection
*/
struct rxrpc_connection *rxrpc_incoming_connection(struct rxrpc_local *local,
- struct rxrpc_peer *peer,
+ struct sockaddr_rxrpc *srx,
struct sk_buff *skb)
{
struct rxrpc_connection *conn, *candidate = NULL;
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+ struct rxrpc_peer *peer;
struct rb_node *p, **pp;
const char *new = "old";
__be32 epoch;
@@ -28,6 +29,12 @@ struct rxrpc_connection *rxrpc_incoming_connection(struct rxrpc_local *local,
_enter("");
+ peer = rxrpc_lookup_peer(local, srx, GFP_NOIO);
+ if (!peer) {
+ _debug("no peer");
+ return ERR_PTR(-EBUSY);
+ }
+
ASSERT(sp->hdr.flags & RXRPC_CLIENT_INITIATED);
epoch = sp->hdr.epoch;
@@ -59,6 +66,7 @@ struct rxrpc_connection *rxrpc_incoming_connection(struct rxrpc_local *local,
* redo the search */
candidate = rxrpc_alloc_connection(GFP_NOIO);
if (!candidate) {
+ rxrpc_put_peer(peer);
_leave(" = -ENOMEM");
return ERR_PTR(-ENOMEM);
}
@@ -115,6 +123,7 @@ struct rxrpc_connection *rxrpc_incoming_connection(struct rxrpc_local *local,
success:
_net("CONNECTION %s %d {%x}", new, conn->debug_id, conn->proto.cid);
+ rxrpc_put_peer(peer);
_leave(" = %p {u=%d}", conn, atomic_read(&conn->usage));
return conn;
diff --git a/net/rxrpc/utils.c b/net/rxrpc/utils.c
index f28122a15a24..d3db02ecc37f 100644
--- a/net/rxrpc/utils.c
+++ b/net/rxrpc/utils.c
@@ -10,6 +10,7 @@
*/
#include <linux/ip.h>
+#include <linux/ipv6.h>
#include <linux/udp.h>
#include "ar-internal.h"
@@ -39,3 +40,34 @@ void rxrpc_get_addr_from_skb(struct rxrpc_local *local,
BUG();
}
}
+
+/*
+ * Fill out a peer address from a socket buffer containing a packet.
+ */
+int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *srx, struct sk_buff *skb)
+{
+ memset(srx, 0, sizeof(*srx));
+
+ switch (ntohs(skb->protocol)) {
+ case ETH_P_IP:
+ srx->transport_type = SOCK_DGRAM;
+ srx->transport_len = sizeof(srx->transport.sin);
+ srx->transport.sin.sin_family = AF_INET;
+ srx->transport.sin.sin_port = udp_hdr(skb)->source;
+ srx->transport.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
+ return 0;
+
+ case ETH_P_IPV6:
+ srx->transport_type = SOCK_DGRAM;
+ srx->transport_len = sizeof(srx->transport.sin6);
+ srx->transport.sin6.sin6_family = AF_INET6;
+ srx->transport.sin6.sin6_port = udp_hdr(skb)->source;
+ srx->transport.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
+ return 0;
+
+ default:
+ pr_warn_ratelimited("AF_RXRPC: Unknown eth protocol %u\n",
+ ntohs(skb->protocol));
+ return -EAFNOSUPPORT;
+ }
+}
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