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>
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@ -607,7 +607,7 @@ static inline void rxrpc_queue_conn(struct rxrpc_connection *conn)
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* conn_service.c
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*/
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struct rxrpc_connection *rxrpc_incoming_connection(struct rxrpc_local *,
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struct rxrpc_peer *,
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struct sockaddr_rxrpc *,
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struct sk_buff *);
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/*
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@ -773,6 +773,7 @@ static inline void rxrpc_sysctl_exit(void) {}
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*/
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void rxrpc_get_addr_from_skb(struct rxrpc_local *, const struct sk_buff *,
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struct sockaddr_rxrpc *);
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int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
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/*
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* debug tracing
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@ -75,7 +75,6 @@ static int rxrpc_accept_incoming_call(struct rxrpc_local *local,
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{
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struct rxrpc_connection *conn;
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struct rxrpc_skb_priv *sp, *nsp;
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struct rxrpc_peer *peer;
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struct rxrpc_call *call;
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struct sk_buff *notification;
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int ret;
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@ -94,15 +93,7 @@ static int rxrpc_accept_incoming_call(struct rxrpc_local *local,
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rxrpc_new_skb(notification);
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notification->mark = RXRPC_SKB_MARK_NEW_CALL;
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peer = rxrpc_lookup_peer(local, srx, GFP_NOIO);
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if (!peer) {
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_debug("no peer");
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ret = -EBUSY;
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goto error;
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}
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conn = rxrpc_incoming_connection(local, peer, skb);
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rxrpc_put_peer(peer);
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conn = rxrpc_incoming_connection(local, srx, skb);
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if (IS_ERR(conn)) {
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_debug("no conn");
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ret = PTR_ERR(conn);
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@ -226,20 +217,8 @@ void rxrpc_accept_incoming_calls(struct rxrpc_local *local)
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whdr._rsvd = 0;
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whdr.serviceId = htons(sp->hdr.serviceId);
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/* determine the remote address */
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memset(&srx, 0, sizeof(srx));
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srx.srx_family = AF_RXRPC;
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srx.transport.family = local->srx.transport.family;
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srx.transport_type = local->srx.transport_type;
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switch (srx.transport.family) {
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case AF_INET:
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srx.transport_len = sizeof(struct sockaddr_in);
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srx.transport.sin.sin_port = udp_hdr(skb)->source;
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srx.transport.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
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break;
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default:
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goto busy;
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}
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if (rxrpc_extract_addr_from_skb(&srx, skb) < 0)
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goto drop;
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/* get the socket providing the service */
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read_lock_bh(&local->services_lock);
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@ -285,6 +264,10 @@ void rxrpc_accept_incoming_calls(struct rxrpc_local *local)
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rxrpc_free_skb(skb);
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return;
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drop:
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rxrpc_free_skb(skb);
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return;
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invalid_service:
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skb->priority = RX_INVALID_OPERATION;
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rxrpc_reject_packet(local, skb);
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@ -16,17 +16,24 @@
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* get a record of an incoming connection
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*/
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struct rxrpc_connection *rxrpc_incoming_connection(struct rxrpc_local *local,
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struct rxrpc_peer *peer,
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struct sockaddr_rxrpc *srx,
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struct sk_buff *skb)
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{
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struct rxrpc_connection *conn, *candidate = NULL;
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struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
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struct rxrpc_peer *peer;
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struct rb_node *p, **pp;
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const char *new = "old";
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u32 epoch, cid;
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_enter("");
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peer = rxrpc_lookup_peer(local, srx, GFP_NOIO);
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if (!peer) {
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_debug("no peer");
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return ERR_PTR(-EBUSY);
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}
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ASSERT(sp->hdr.flags & RXRPC_CLIENT_INITIATED);
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epoch = sp->hdr.epoch;
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@ -58,6 +65,7 @@ struct rxrpc_connection *rxrpc_incoming_connection(struct rxrpc_local *local,
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* redo the search */
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candidate = rxrpc_alloc_connection(GFP_NOIO);
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if (!candidate) {
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rxrpc_put_peer(peer);
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_leave(" = -ENOMEM");
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return ERR_PTR(-ENOMEM);
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}
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@ -114,6 +122,7 @@ struct rxrpc_connection *rxrpc_incoming_connection(struct rxrpc_local *local,
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success:
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_net("CONNECTION %s %d {%x}", new, conn->debug_id, conn->proto.cid);
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rxrpc_put_peer(peer);
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_leave(" = %p {u=%d}", conn, atomic_read(&conn->usage));
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return conn;
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@ -10,6 +10,7 @@
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*/
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/udp.h>
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#include "ar-internal.h"
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@ -39,3 +40,34 @@ void rxrpc_get_addr_from_skb(struct rxrpc_local *local,
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BUG();
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}
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}
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/*
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* Fill out a peer address from a socket buffer containing a packet.
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*/
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int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *srx, struct sk_buff *skb)
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{
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memset(srx, 0, sizeof(*srx));
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switch (ntohs(skb->protocol)) {
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case ETH_P_IP:
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srx->transport_type = SOCK_DGRAM;
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srx->transport_len = sizeof(srx->transport.sin);
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srx->transport.sin.sin_family = AF_INET;
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srx->transport.sin.sin_port = udp_hdr(skb)->source;
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srx->transport.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
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return 0;
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case ETH_P_IPV6:
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srx->transport_type = SOCK_DGRAM;
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srx->transport_len = sizeof(srx->transport.sin6);
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srx->transport.sin6.sin6_family = AF_INET6;
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srx->transport.sin6.sin6_port = udp_hdr(skb)->source;
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srx->transport.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
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return 0;
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default:
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pr_warn_ratelimited("AF_RXRPC: Unknown eth protocol %u\n",
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ntohs(skb->protocol));
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return -EAFNOSUPPORT;
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}
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}
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