rxrpc: Rename files matching ar-*.c to git rid of the "ar-" prefix

Rename files matching net/rxrpc/ar-*.c to get rid of the "ar-" prefix.
This will aid splitting those files by making easier to come up with new
names.

Note that the not all files are simply renamed from ar-X.c to X.c.  The
following exceptions are made:

 (*) ar-call.c -> call_object.c
     ar-ack.c -> call_event.c

     call_object.c is going to contain the core of the call object
     handling.  Call event handling is all going to be in call_event.c.

 (*) ar-accept.c -> call_accept.c

     Incoming call handling is going to be here.

 (*) ar-connection.c -> conn_object.c
     ar-connevent.c -> conn_event.c

     The former file is going to have the basic connection object handling,
     but there will likely be some differentiation between client
     connections and service connections in additional files later.  The
     latter file will have all the connection-level event handling.

 (*) ar-local.c -> local_object.c

     This will have the local endpoint object handling code.  The local
     endpoint event handling code will later be split out into
     local_event.c.

 (*) ar-peer.c -> peer_object.c

     This will have the peer endpoint object handling code.  Peer event
     handling code will be placed in peer_event.c (for the moment, there is
     none).

 (*) ar-error.c -> peer_event.c

     This will become the peer event handling code, though for the moment
     it's actually driven from the local endpoint's perspective.

Note that I haven't renamed ar-transport.c to transport_object.c as the
intention is to delete it when the rxrpc_transport struct is excised.

The only file that actually has its contents changed is net/rxrpc/Makefile.

net/rxrpc/ar-internal.h will need its section marker comments updating, but
I'll do that in a separate patch to make it easier for git to follow the
history across the rename.  I may also want to rename ar-internal.h at some
point - but that would mean updating all the #includes and I'd rather do
that in a separate step.

Signed-off-by: David Howells <dhowells@redhat.com.

1 files changed, 230 insertions, 0 deletions

diff --git a/net/rxrpc/peer_event.c b/net/rxrpc/peer_event.c
new file mode 100644
index 000000000000..3e82d6f0313c
--- /dev/null
+++ b/net/rxrpc/peer_event.c
@@ -0,0 +1,230 @@
+/* Error message handling (ICMP)
+ *
+ * Copyright (C) 2007 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 License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/errqueue.h>
+#include <linux/udp.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/icmp.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include <net/ip.h>
+#include "ar-internal.h"
+
+/*
+ * handle an error received on the local endpoint
+ */
+void rxrpc_UDP_error_report(struct sock *sk)
+{
+	struct sock_exterr_skb *serr;
+	struct rxrpc_transport *trans;
+	struct rxrpc_local *local = sk->sk_user_data;
+	struct rxrpc_peer *peer;
+	struct sk_buff *skb;
+	__be32 addr;
+	__be16 port;
+
+	_enter("%p{%d}", sk, local->debug_id);
+
+	skb = sock_dequeue_err_skb(sk);
+	if (!skb) {
+		_leave("UDP socket errqueue empty");
+		return;
+	}
+	serr = SKB_EXT_ERR(skb);
+	if (!skb->len && serr->ee.ee_origin == SO_EE_ORIGIN_TIMESTAMPING) {
+		_leave("UDP empty message");
+		kfree_skb(skb);
+		return;
+	}
+
+	rxrpc_new_skb(skb);
+
+	addr = *(__be32 *)(skb_network_header(skb) + serr->addr_offset);
+	port = serr->port;
+
+	_net("Rx UDP Error from %pI4:%hu", &addr, ntohs(port));
+	_debug("Msg l:%d d:%d", skb->len, skb->data_len);
+
+	peer = rxrpc_find_peer(local, addr, port);
+	if (IS_ERR(peer)) {
+		rxrpc_free_skb(skb);
+		_leave(" [no peer]");
+		return;
+	}
+
+	trans = rxrpc_find_transport(local, peer);
+	if (!trans) {
+		rxrpc_put_peer(peer);
+		rxrpc_free_skb(skb);
+		_leave(" [no trans]");
+		return;
+	}
+
+	if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP &&
+	    serr->ee.ee_type == ICMP_DEST_UNREACH &&
+	    serr->ee.ee_code == ICMP_FRAG_NEEDED
+	    ) {
+		u32 mtu = serr->ee.ee_info;
+
+		_net("Rx Received ICMP Fragmentation Needed (%d)", mtu);
+
+		/* wind down the local interface MTU */
+		if (mtu > 0 && peer->if_mtu == 65535 && mtu < peer->if_mtu) {
+			peer->if_mtu = mtu;
+			_net("I/F MTU %u", mtu);
+		}
+
+		if (mtu == 0) {
+			/* they didn't give us a size, estimate one */
+			mtu = peer->if_mtu;
+			if (mtu > 1500) {
+				mtu >>= 1;
+				if (mtu < 1500)
+					mtu = 1500;
+			} else {
+				mtu -= 100;
+				if (mtu < peer->hdrsize)
+					mtu = peer->hdrsize + 4;
+			}
+		}
+
+		if (mtu < peer->mtu) {
+			spin_lock_bh(&peer->lock);
+			peer->mtu = mtu;
+			peer->maxdata = peer->mtu - peer->hdrsize;
+			spin_unlock_bh(&peer->lock);
+			_net("Net MTU %u (maxdata %u)",
+			     peer->mtu, peer->maxdata);
+		}
+	}
+
+	rxrpc_put_peer(peer);
+
+	/* pass the transport ref to error_handler to release */
+	skb_queue_tail(&trans->error_queue, skb);
+	rxrpc_queue_work(&trans->error_handler);
+	_leave("");
+}
+
+/*
+ * deal with UDP error messages
+ */
+void rxrpc_UDP_error_handler(struct work_struct *work)
+{
+	struct sock_extended_err *ee;
+	struct sock_exterr_skb *serr;
+	struct rxrpc_transport *trans =
+		container_of(work, struct rxrpc_transport, error_handler);
+	struct sk_buff *skb;
+	int err;
+
+	_enter("");
+
+	skb = skb_dequeue(&trans->error_queue);
+	if (!skb)
+		return;
+
+	serr = SKB_EXT_ERR(skb);
+	ee = &serr->ee;
+
+	_net("Rx Error o=%d t=%d c=%d e=%d",
+	     ee->ee_origin, ee->ee_type, ee->ee_code, ee->ee_errno);
+
+	err = ee->ee_errno;
+
+	switch (ee->ee_origin) {
+	case SO_EE_ORIGIN_ICMP:
+		switch (ee->ee_type) {
+		case ICMP_DEST_UNREACH:
+			switch (ee->ee_code) {
+			case ICMP_NET_UNREACH:
+				_net("Rx Received ICMP Network Unreachable");
+				break;
+			case ICMP_HOST_UNREACH:
+				_net("Rx Received ICMP Host Unreachable");
+				break;
+			case ICMP_PORT_UNREACH:
+				_net("Rx Received ICMP Port Unreachable");
+				break;
+			case ICMP_NET_UNKNOWN:
+				_net("Rx Received ICMP Unknown Network");
+				break;
+			case ICMP_HOST_UNKNOWN:
+				_net("Rx Received ICMP Unknown Host");
+				break;
+			default:
+				_net("Rx Received ICMP DestUnreach code=%u",
+				     ee->ee_code);
+				break;
+			}
+			break;
+
+		case ICMP_TIME_EXCEEDED:
+			_net("Rx Received ICMP TTL Exceeded");
+			break;
+
+		default:
+			_proto("Rx Received ICMP error { type=%u code=%u }",
+			       ee->ee_type, ee->ee_code);
+			break;
+		}
+		break;
+
+	case SO_EE_ORIGIN_LOCAL:
+		_proto("Rx Received local error { error=%d }",
+		       ee->ee_errno);
+		break;
+
+	case SO_EE_ORIGIN_NONE:
+	case SO_EE_ORIGIN_ICMP6:
+	default:
+		_proto("Rx Received error report { orig=%u }",
+		       ee->ee_origin);
+		break;
+	}
+
+	/* terminate all the affected calls if there's an unrecoverable
+	 * error */
+	if (err) {
+		struct rxrpc_call *call, *_n;
+
+		_debug("ISSUE ERROR %d", err);
+
+		spin_lock_bh(&trans->peer->lock);
+		trans->peer->net_error = err;
+
+		list_for_each_entry_safe(call, _n, &trans->peer->error_targets,
+					 error_link) {
+			write_lock(&call->state_lock);
+			if (call->state != RXRPC_CALL_COMPLETE &&
+			    call->state < RXRPC_CALL_NETWORK_ERROR) {
+				call->state = RXRPC_CALL_NETWORK_ERROR;
+				set_bit(RXRPC_CALL_EV_RCVD_ERROR, &call->events);
+				rxrpc_queue_call(call);
+			}
+			write_unlock(&call->state_lock);
+			list_del_init(&call->error_link);
+		}
+
+		spin_unlock_bh(&trans->peer->lock);
+	}
+
+	if (!skb_queue_empty(&trans->error_queue))
+		rxrpc_queue_work(&trans->error_handler);
+
+	rxrpc_free_skb(skb);
+	rxrpc_put_transport(trans);
+	_leave("");
+}