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authorDavid Howells <dhowells@redhat.com>2016-04-04 14:00:40 +0100
committerDavid Howells <dhowells@redhat.com>2016-07-06 10:49:35 +0100
commit7877a4a4bdf0d782276f1cba868878aee77718ee (patch)
treed7bbda493ebfda88069805ac2b19a21e3ef5e771 /net/rxrpc/conn_service.c
parentc6d2b8d764f5edd79f708bdc49d1176072ee77a1 (diff)
downloadop-kernel-dev-7877a4a4bdf0d782276f1cba868878aee77718ee.zip
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rxrpc: Split service connection code out into its own file
Split the service-specific connection code out into into its own file. The client-specific code has already been split out. This will leave just the common code in the original file. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'net/rxrpc/conn_service.c')
-rw-r--r--net/rxrpc/conn_service.c145
1 files changed, 145 insertions, 0 deletions
diff --git a/net/rxrpc/conn_service.c b/net/rxrpc/conn_service.c
new file mode 100644
index 0000000..cdcac50
--- /dev/null
+++ b/net/rxrpc/conn_service.c
@@ -0,0 +1,145 @@
+/* Service connection management
+ *
+ * Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#include <linux/slab.h>
+#include "ar-internal.h"
+
+/*
+ * get a record of an incoming connection
+ */
+struct rxrpc_connection *rxrpc_incoming_connection(struct rxrpc_local *local,
+ struct rxrpc_peer *peer,
+ struct sk_buff *skb)
+{
+ struct rxrpc_connection *conn, *candidate = NULL;
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+ struct rb_node *p, **pp;
+ const char *new = "old";
+ u32 epoch, cid;
+
+ _enter("");
+
+ ASSERT(sp->hdr.flags & RXRPC_CLIENT_INITIATED);
+
+ epoch = sp->hdr.epoch;
+ cid = sp->hdr.cid & RXRPC_CIDMASK;
+
+ /* search the connection list first */
+ read_lock_bh(&peer->conn_lock);
+
+ p = peer->service_conns.rb_node;
+ while (p) {
+ conn = rb_entry(p, struct rxrpc_connection, service_node);
+
+ _debug("maybe %x", conn->proto.cid);
+
+ if (epoch < conn->proto.epoch)
+ p = p->rb_left;
+ else if (epoch > conn->proto.epoch)
+ p = p->rb_right;
+ else if (cid < conn->proto.cid)
+ p = p->rb_left;
+ else if (cid > conn->proto.cid)
+ p = p->rb_right;
+ else
+ goto found_extant_connection;
+ }
+ read_unlock_bh(&peer->conn_lock);
+
+ /* not yet present - create a candidate for a new record and then
+ * redo the search */
+ candidate = rxrpc_alloc_connection(GFP_NOIO);
+ if (!candidate) {
+ _leave(" = -ENOMEM");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ candidate->proto.local = local;
+ candidate->proto.epoch = sp->hdr.epoch;
+ candidate->proto.cid = sp->hdr.cid & RXRPC_CIDMASK;
+ candidate->proto.in_clientflag = RXRPC_CLIENT_INITIATED;
+ candidate->params.local = local;
+ candidate->params.peer = peer;
+ candidate->params.service_id = sp->hdr.serviceId;
+ candidate->security_ix = sp->hdr.securityIndex;
+ candidate->out_clientflag = 0;
+ candidate->state = RXRPC_CONN_SERVICE;
+ if (candidate->params.service_id)
+ candidate->state = RXRPC_CONN_SERVICE_UNSECURED;
+
+ write_lock_bh(&peer->conn_lock);
+
+ pp = &peer->service_conns.rb_node;
+ p = NULL;
+ while (*pp) {
+ p = *pp;
+ conn = rb_entry(p, struct rxrpc_connection, service_node);
+
+ if (epoch < conn->proto.epoch)
+ pp = &(*pp)->rb_left;
+ else if (epoch > conn->proto.epoch)
+ pp = &(*pp)->rb_right;
+ else if (cid < conn->proto.cid)
+ pp = &(*pp)->rb_left;
+ else if (cid > conn->proto.cid)
+ pp = &(*pp)->rb_right;
+ else
+ goto found_extant_second;
+ }
+
+ /* we can now add the new candidate to the list */
+ conn = candidate;
+ candidate = NULL;
+ rb_link_node(&conn->service_node, p, pp);
+ rb_insert_color(&conn->service_node, &peer->service_conns);
+ rxrpc_get_peer(peer);
+ rxrpc_get_local(local);
+
+ write_unlock_bh(&peer->conn_lock);
+
+ write_lock(&rxrpc_connection_lock);
+ list_add_tail(&conn->link, &rxrpc_connections);
+ write_unlock(&rxrpc_connection_lock);
+
+ new = "new";
+
+success:
+ _net("CONNECTION %s %d {%x}", new, conn->debug_id, conn->proto.cid);
+
+ _leave(" = %p {u=%d}", conn, atomic_read(&conn->usage));
+ return conn;
+
+ /* we found the connection in the list immediately */
+found_extant_connection:
+ if (sp->hdr.securityIndex != conn->security_ix) {
+ read_unlock_bh(&peer->conn_lock);
+ goto security_mismatch;
+ }
+ rxrpc_get_connection(conn);
+ read_unlock_bh(&peer->conn_lock);
+ goto success;
+
+ /* we found the connection on the second time through the list */
+found_extant_second:
+ if (sp->hdr.securityIndex != conn->security_ix) {
+ write_unlock_bh(&peer->conn_lock);
+ goto security_mismatch;
+ }
+ rxrpc_get_connection(conn);
+ write_unlock_bh(&peer->conn_lock);
+ kfree(candidate);
+ goto success;
+
+security_mismatch:
+ kfree(candidate);
+ _leave(" = -EKEYREJECTED");
+ return ERR_PTR(-EKEYREJECTED);
+}
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