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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@redhat.com>
This commit is contained in:
David Howells 2016-06-29 14:40:39 +01:00
parent 7877a4a4bd
commit d991b4a32f
4 changed files with 51 additions and 26 deletions
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3
net/rxrpc/ar-internal.h
View File

@ -607,7 +607,7 @@ 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 *);
/*
@ -773,6 +773,7 @@ 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

31
net/rxrpc/call_accept.c
View File

@ -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 @@ void rxrpc_accept_incoming_calls(struct rxrpc_local *local)
rxrpc_free_skb(skb);
return;
drop:
rxrpc_free_skb(skb);
return;
invalid_service:
skb->priority = RX_INVALID_OPERATION;
rxrpc_reject_packet(local, skb);

11
net/rxrpc/conn_service.c
View File

@ -16,17 +16,24 @@
* 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";
u32 epoch, cid;
_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;
@ -58,6 +65,7 @@ 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);
}
@ -114,6 +122,7 @@ 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;

32
net/rxrpc/utils.c
View File

@ -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;
}
}