[deliverable/linux.git] / net / rxrpc / conn_event.c

/* connection-level event handling
 *
 * 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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/net.h>
#include <linux/skbuff.h>
#include <linux/errqueue.h>
#include <net/sock.h>
#include <net/af_rxrpc.h>
#include <net/ip.h>
#include "ar-internal.h"

/*
 * Retransmit terminal ACK or ABORT of the previous call.
 */
static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
				       struct sk_buff *skb)
{
	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
	struct rxrpc_channel *chan;
	struct msghdr msg;
	struct kvec iov;
	struct {
		struct rxrpc_wire_header whdr;
		union {
			struct {
				__be32 code;
			} abort;
			struct {
				struct rxrpc_ackpacket ack;
				u8 padding[3];
				struct rxrpc_ackinfo info;
			};
		};
	} __attribute__((packed)) pkt;
	size_t len;
	u32 serial, mtu, call_id;

	_enter("%d", conn->debug_id);

	chan = &conn->channels[sp->hdr.cid & RXRPC_CHANNELMASK];

	/* If the last call got moved on whilst we were waiting to run, just
	 * ignore this packet.
	 */
	call_id = READ_ONCE(chan->last_call);
	/* Sync with __rxrpc_disconnect_call() */
	smp_rmb();
	if (call_id != sp->hdr.callNumber)
		return;

	msg.msg_name	= &conn->params.peer->srx.transport;
	msg.msg_namelen	= conn->params.peer->srx.transport_len;
	msg.msg_control	= NULL;
	msg.msg_controllen = 0;
	msg.msg_flags	= 0;

	pkt.whdr.epoch		= htonl(sp->hdr.epoch);
	pkt.whdr.cid		= htonl(sp->hdr.cid);
	pkt.whdr.callNumber	= htonl(sp->hdr.callNumber);
	pkt.whdr.seq		= 0;
	pkt.whdr.type		= chan->last_type;
	pkt.whdr.flags		= conn->out_clientflag;
	pkt.whdr.userStatus	= 0;
	pkt.whdr.securityIndex	= conn->security_ix;
	pkt.whdr._rsvd		= 0;
	pkt.whdr.serviceId	= htons(chan->last_service_id);

	len = sizeof(pkt.whdr);
	switch (chan->last_type) {
	case RXRPC_PACKET_TYPE_ABORT:
		pkt.abort.code	= htonl(chan->last_abort);
		len += sizeof(pkt.abort);
		break;

	case RXRPC_PACKET_TYPE_ACK:
		mtu = conn->params.peer->if_mtu;
		mtu -= conn->params.peer->hdrsize;
		pkt.ack.bufferSpace	= 0;
		pkt.ack.maxSkew		= htons(skb->priority);
		pkt.ack.firstPacket	= htonl(chan->last_seq);
		pkt.ack.previousPacket	= htonl(chan->last_seq - 1);
		pkt.ack.serial		= htonl(sp->hdr.serial);
		pkt.ack.reason		= RXRPC_ACK_DUPLICATE;
		pkt.ack.nAcks		= 0;
		pkt.info.rxMTU		= htonl(rxrpc_rx_mtu);
		pkt.info.maxMTU		= htonl(mtu);
		pkt.info.rwind		= htonl(rxrpc_rx_window_size);
		pkt.info.jumbo_max	= htonl(rxrpc_rx_jumbo_max);
		len += sizeof(pkt.ack) + sizeof(pkt.info);
		break;
	}

	/* Resync with __rxrpc_disconnect_call() and check that the last call
	 * didn't get advanced whilst we were filling out the packets.
	 */
	smp_rmb();
	if (READ_ONCE(chan->last_call) != call_id)
		return;

	iov.iov_base	= &pkt;
	iov.iov_len	= len;

	serial = atomic_inc_return(&conn->serial);
	pkt.whdr.serial = htonl(serial);

	switch (chan->last_type) {
	case RXRPC_PACKET_TYPE_ABORT:
		_proto("Tx ABORT %%%u { %d } [re]", serial, conn->local_abort);
		break;
	case RXRPC_PACKET_TYPE_ACK:
		_proto("Tx ACK %%%u [re]", serial);
		break;
	}

	kernel_sendmsg(conn->params.local->socket, &msg, &iov, 1, len);
	_leave("");
	return;
}

/*
 * pass a connection-level abort onto all calls on that connection
 */
static void rxrpc_abort_calls(struct rxrpc_connection *conn,
			      enum rxrpc_call_completion compl,
			      u32 abort_code, int error)
{
	struct rxrpc_call *call;
	int i;

	_enter("{%d},%x", conn->debug_id, abort_code);

	spin_lock(&conn->channel_lock);

	for (i = 0; i < RXRPC_MAXCALLS; i++) {
		call = rcu_dereference_protected(
			conn->channels[i].call,
			lockdep_is_held(&conn->channel_lock));
		if (call) {
			if (compl == RXRPC_CALL_LOCALLY_ABORTED)
				trace_rxrpc_abort("CON", call->cid,
						  call->call_id, 0,
						  abort_code, error);
			if (rxrpc_set_call_completion(call, compl,
						      abort_code, error))
				rxrpc_notify_socket(call);
		}
	}

	spin_unlock(&conn->channel_lock);
	_leave("");
}

/*
 * generate a connection-level abort
 */
static int rxrpc_abort_connection(struct rxrpc_connection *conn,
				  u32 error, u32 abort_code)
{
	struct rxrpc_wire_header whdr;
	struct msghdr msg;
	struct kvec iov[2];
	__be32 word;
	size_t len;
	u32 serial;
	int ret;

	_enter("%d,,%u,%u", conn->debug_id, error, abort_code);

	/* generate a connection-level abort */
	spin_lock_bh(&conn->state_lock);
	if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
		spin_unlock_bh(&conn->state_lock);
		_leave(" = 0 [already dead]");
		return 0;
	}

	conn->state = RXRPC_CONN_LOCALLY_ABORTED;
	spin_unlock_bh(&conn->state_lock);

	rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code, error);

	msg.msg_name	= &conn->params.peer->srx.transport;
	msg.msg_namelen	= conn->params.peer->srx.transport_len;
	msg.msg_control	= NULL;
	msg.msg_controllen = 0;
	msg.msg_flags	= 0;

	whdr.epoch	= htonl(conn->proto.epoch);
	whdr.cid	= htonl(conn->proto.cid);
	whdr.callNumber	= 0;
	whdr.seq	= 0;
	whdr.type	= RXRPC_PACKET_TYPE_ABORT;
	whdr.flags	= conn->out_clientflag;
	whdr.userStatus	= 0;
	whdr.securityIndex = conn->security_ix;
	whdr._rsvd	= 0;
	whdr.serviceId	= htons(conn->params.service_id);

	word		= htonl(conn->local_abort);

	iov[0].iov_base	= &whdr;
	iov[0].iov_len	= sizeof(whdr);
	iov[1].iov_base	= &word;
	iov[1].iov_len	= sizeof(word);

	len = iov[0].iov_len + iov[1].iov_len;

	serial = atomic_inc_return(&conn->serial);
	whdr.serial = htonl(serial);
	_proto("Tx CONN ABORT %%%u { %d }", serial, conn->local_abort);

	ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
	if (ret < 0) {
		_debug("sendmsg failed: %d", ret);
		return -EAGAIN;
	}

	_leave(" = 0");
	return 0;
}

/*
 * mark a call as being on a now-secured channel
 * - must be called with BH's disabled.
 */
static void rxrpc_call_is_secure(struct rxrpc_call *call)
{
	_enter("%p", call);
	if (call) {
		write_lock_bh(&call->state_lock);
		if (call->state == RXRPC_CALL_SERVER_SECURING) {
			call->state = RXRPC_CALL_SERVER_ACCEPTING;
			rxrpc_notify_socket(call);
		}
		write_unlock_bh(&call->state_lock);
	}
}

/*
 * connection-level Rx packet processor
 */
static int rxrpc_process_event(struct rxrpc_connection *conn,
			       struct sk_buff *skb,
			       u32 *_abort_code)
{
	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
	__be32 wtmp;
	u32 abort_code;
	int loop, ret;

	if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
		_leave(" = -ECONNABORTED [%u]", conn->state);
		return -ECONNABORTED;
	}

	_enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, sp->hdr.serial);

	switch (sp->hdr.type) {
	case RXRPC_PACKET_TYPE_DATA:
	case RXRPC_PACKET_TYPE_ACK:
		rxrpc_conn_retransmit_call(conn, skb);
		return 0;

	case RXRPC_PACKET_TYPE_ABORT:
		if (skb_copy_bits(skb, sp->offset, &wtmp, sizeof(wtmp)) < 0)
			return -EPROTO;
		abort_code = ntohl(wtmp);
		_proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code);

		conn->state = RXRPC_CONN_REMOTELY_ABORTED;
		rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED,
				  abort_code, ECONNABORTED);
		return -ECONNABORTED;

	case RXRPC_PACKET_TYPE_CHALLENGE:
		return conn->security->respond_to_challenge(conn, skb,
							    _abort_code);

	case RXRPC_PACKET_TYPE_RESPONSE:
		ret = conn->security->verify_response(conn, skb, _abort_code);
		if (ret < 0)
			return ret;

		ret = conn->security->init_connection_security(conn);
		if (ret < 0)
			return ret;

		ret = conn->security->prime_packet_security(conn);
		if (ret < 0)
			return ret;

		spin_lock(&conn->channel_lock);
		spin_lock(&conn->state_lock);

		if (conn->state == RXRPC_CONN_SERVICE_CHALLENGING) {
			conn->state = RXRPC_CONN_SERVICE;
			spin_unlock(&conn->state_lock);
			for (loop = 0; loop < RXRPC_MAXCALLS; loop++)
				rxrpc_call_is_secure(
					rcu_dereference_protected(
						conn->channels[loop].call,
						lockdep_is_held(&conn->channel_lock)));
		} else {
			spin_unlock(&conn->state_lock);
		}

		spin_unlock(&conn->channel_lock);
		return 0;

	default:
		_leave(" = -EPROTO [%u]", sp->hdr.type);
		return -EPROTO;
	}
}

/*
 * set up security and issue a challenge
 */
static void rxrpc_secure_connection(struct rxrpc_connection *conn)
{
	u32 abort_code;
	int ret;

	_enter("{%d}", conn->debug_id);

	ASSERT(conn->security_ix != 0);

	if (!conn->params.key) {
		_debug("set up security");
		ret = rxrpc_init_server_conn_security(conn);
		switch (ret) {
		case 0:
			break;
		case -ENOENT:
			abort_code = RX_CALL_DEAD;
			goto abort;
		default:
			abort_code = RXKADNOAUTH;
			goto abort;
		}
	}

	if (conn->security->issue_challenge(conn) < 0) {
		abort_code = RX_CALL_DEAD;
		ret = -ENOMEM;
		goto abort;
	}

	_leave("");
	return;

abort:
	_debug("abort %d, %d", ret, abort_code);
	rxrpc_abort_connection(conn, -ret, abort_code);
	_leave(" [aborted]");
}

/*
 * connection-level event processor
 */
void rxrpc_process_connection(struct work_struct *work)
{
	struct rxrpc_connection *conn =
		container_of(work, struct rxrpc_connection, processor);
	struct sk_buff *skb;
	u32 abort_code = RX_PROTOCOL_ERROR;
	int ret;

	_enter("{%d}", conn->debug_id);

	if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events))
		rxrpc_secure_connection(conn);

	/* go through the conn-level event packets, releasing the ref on this
	 * connection that each one has when we've finished with it */
	while ((skb = skb_dequeue(&conn->rx_queue))) {
		rxrpc_see_skb(skb);
		ret = rxrpc_process_event(conn, skb, &abort_code);
		switch (ret) {
		case -EPROTO:
		case -EKEYEXPIRED:
		case -EKEYREJECTED:
			goto protocol_error;
		case -EAGAIN:
			goto requeue_and_leave;
		case -ECONNABORTED:
		default:
			rxrpc_free_skb(skb);
			break;
		}
	}

out:
	rxrpc_put_connection(conn);
	_leave("");
	return;

requeue_and_leave:
	skb_queue_head(&conn->rx_queue, skb);
	goto out;

protocol_error:
	if (rxrpc_abort_connection(conn, -ret, abort_code) < 0)
		goto requeue_and_leave;
	rxrpc_free_skb(skb);
	_leave(" [EPROTO]");
	goto out;
}
Commit	Line	Data
17926a79 DH	1	/* connection-level event handling
	2	*
	3	* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
	4	* Written by David Howells (dhowells@redhat.com)
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*/
	11
9b6d5398 JP	12	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9b6d5398 JP	13
17926a79 DH	14	#include <linux/module.h>
	15	#include <linux/net.h>
	16	#include <linux/skbuff.h>
	17	#include <linux/errqueue.h>
17926a79 DH	18	#include <net/sock.h>
	19	#include <net/af_rxrpc.h>
	20	#include <net/ip.h>
	21	#include "ar-internal.h"
	22
18bfeba5 DH	23	/*
	24	* Retransmit terminal ACK or ABORT of the previous call.
	25	*/
f5c17aae DH	26	static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
f5c17aae DH	27	struct sk_buff *skb)
18bfeba5 DH	28	{
	29	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
	30	struct rxrpc_channel *chan;
	31	struct msghdr msg;
	32	struct kvec iov;
	33	struct {
	34	struct rxrpc_wire_header whdr;
	35	union {
	36	struct {
	37	__be32 code;
	38	} abort;
	39	struct {
	40	struct rxrpc_ackpacket ack;
2266ffde	41	u8 padding[3];
18bfeba5 DH	42	struct rxrpc_ackinfo info;
	43	};
	44	};
	45	} __attribute__((packed)) pkt;
	46	size_t len;
	47	u32 serial, mtu, call_id;
	48
	49	_enter("%d", conn->debug_id);
	50
	51	chan = &conn->channels[sp->hdr.cid & RXRPC_CHANNELMASK];
	52
	53	/* If the last call got moved on whilst we were waiting to run, just
	54	* ignore this packet.
	55	*/
	56	call_id = READ_ONCE(chan->last_call);
	57	/* Sync with __rxrpc_disconnect_call() */
	58	smp_rmb();
	59	if (call_id != sp->hdr.callNumber)
	60	return;
	61
	62	msg.msg_name = &conn->params.peer->srx.transport;
	63	msg.msg_namelen = conn->params.peer->srx.transport_len;
	64	msg.msg_control = NULL;
	65	msg.msg_controllen = 0;
	66	msg.msg_flags = 0;
	67
	68	pkt.whdr.epoch = htonl(sp->hdr.epoch);
	69	pkt.whdr.cid = htonl(sp->hdr.cid);
	70	pkt.whdr.callNumber = htonl(sp->hdr.callNumber);
	71	pkt.whdr.seq = 0;
	72	pkt.whdr.type = chan->last_type;
	73	pkt.whdr.flags = conn->out_clientflag;
	74	pkt.whdr.userStatus = 0;
	75	pkt.whdr.securityIndex = conn->security_ix;
	76	pkt.whdr._rsvd = 0;
	77	pkt.whdr.serviceId = htons(chan->last_service_id);
	78
	79	len = sizeof(pkt.whdr);
	80	switch (chan->last_type) {
	81	case RXRPC_PACKET_TYPE_ABORT:
	82	pkt.abort.code = htonl(chan->last_abort);
	83	len += sizeof(pkt.abort);
	84	break;
	85
	86	case RXRPC_PACKET_TYPE_ACK:
	87	mtu = conn->params.peer->if_mtu;
	88	mtu -= conn->params.peer->hdrsize;
	89	pkt.ack.bufferSpace = 0;
	90	pkt.ack.maxSkew = htons(skb->priority);
	91	pkt.ack.firstPacket = htonl(chan->last_seq);
	92	pkt.ack.previousPacket = htonl(chan->last_seq - 1);
	93	pkt.ack.serial = htonl(sp->hdr.serial);
	94	pkt.ack.reason = RXRPC_ACK_DUPLICATE;
	95	pkt.ack.nAcks = 0;
	96	pkt.info.rxMTU = htonl(rxrpc_rx_mtu);
	97	pkt.info.maxMTU = htonl(mtu);
	98	pkt.info.rwind = htonl(rxrpc_rx_window_size);
	99	pkt.info.jumbo_max = htonl(rxrpc_rx_jumbo_max);
	100	len += sizeof(pkt.ack) + sizeof(pkt.info);
	101	break;
	102	}
	103
	104	/* Resync with __rxrpc_disconnect_call() and check that the last call
	105	* didn't get advanced whilst we were filling out the packets.
106	*/
107	smp_rmb();
108	if (READ_ONCE(chan->last_call) != call_id)
109	return;
110
111	iov.iov_base = &pkt;
112	iov.iov_len = len;
113
114	serial = atomic_inc_return(&conn->serial);
115	pkt.whdr.serial = htonl(serial);
116
117	switch (chan->last_type) {
118	case RXRPC_PACKET_TYPE_ABORT:
119	_proto("Tx ABORT %%%u { %d } [re]", serial, conn->local_abort);
120	break;
121	case RXRPC_PACKET_TYPE_ACK:
122	_proto("Tx ACK %%%u [re]", serial);
123	break;
124	}
125
126	kernel_sendmsg(conn->params.local->socket, &msg, &iov, 1, len);
127	_leave("");
128	return;
129	}
130
17926a79 DH	131	/*
	132	* pass a connection-level abort onto all calls on that connection
	133	*/
f5c17aae DH	134	static void rxrpc_abort_calls(struct rxrpc_connection *conn,
	135	enum rxrpc_call_completion compl,
	136	u32 abort_code, int error)
17926a79 DH	137	{
17926a79 DH	138	struct rxrpc_call *call;
248f219c	139	int i;
17926a79 DH	140
	141	_enter("{%d},%x", conn->debug_id, abort_code);
	142
a1399f8b	143	spin_lock(&conn->channel_lock);
17926a79	144
a1399f8b DH	145	for (i = 0; i < RXRPC_MAXCALLS; i++) {
	146	call = rcu_dereference_protected(
	147	conn->channels[i].call,
	148	lockdep_is_held(&conn->channel_lock));
ccbd3dbe	149	if (call) {
5a42976d DH	150	if (compl == RXRPC_CALL_LOCALLY_ABORTED)
	151	trace_rxrpc_abort("CON", call->cid,
	152	call->call_id, 0,
	153	abort_code, error);
248f219c DH	154	if (rxrpc_set_call_completion(call, compl,
	155	abort_code, error))
	156	rxrpc_notify_socket(call);
17926a79	157	}
17926a79 DH	158	}
17926a79 DH	159
a1399f8b	160	spin_unlock(&conn->channel_lock);
17926a79 DH	161	_leave("");
	162	}
	163
	164	/*
	165	* generate a connection-level abort
	166	*/
	167	static int rxrpc_abort_connection(struct rxrpc_connection *conn,
	168	u32 error, u32 abort_code)
	169	{
0d12f8a4	170	struct rxrpc_wire_header whdr;
17926a79 DH	171	struct msghdr msg;
	172	struct kvec iov[2];
	173	__be32 word;
	174	size_t len;
0d12f8a4	175	u32 serial;
17926a79 DH	176	int ret;
	177
	178	_enter("%d,,%u,%u", conn->debug_id, error, abort_code);
	179
	180	/* generate a connection-level abort */
	181	spin_lock_bh(&conn->state_lock);
f5c17aae	182	if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
17926a79 DH	183	spin_unlock_bh(&conn->state_lock);
	184	_leave(" = 0 [already dead]");
	185	return 0;
	186	}
	187
f5c17aae DH	188	conn->state = RXRPC_CONN_LOCALLY_ABORTED;
	189	spin_unlock_bh(&conn->state_lock);
	190
	191	rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code, error);
17926a79	192
85f32278 DH	193	msg.msg_name = &conn->params.peer->srx.transport;
85f32278 DH	194	msg.msg_namelen = conn->params.peer->srx.transport_len;
17926a79 DH	195	msg.msg_control = NULL;
	196	msg.msg_controllen = 0;
	197	msg.msg_flags = 0;
	198
19ffa01c DH	199	whdr.epoch = htonl(conn->proto.epoch);
19ffa01c DH	200	whdr.cid = htonl(conn->proto.cid);
0d12f8a4 DH	201	whdr.callNumber = 0;
	202	whdr.seq = 0;
	203	whdr.type = RXRPC_PACKET_TYPE_ABORT;
	204	whdr.flags = conn->out_clientflag;
	205	whdr.userStatus = 0;
	206	whdr.securityIndex = conn->security_ix;
	207	whdr._rsvd = 0;
19ffa01c	208	whdr.serviceId = htons(conn->params.service_id);
17926a79	209
dc44b3a0	210	word = htonl(conn->local_abort);
17926a79	211
0d12f8a4 DH	212	iov[0].iov_base = &whdr;
0d12f8a4 DH	213	iov[0].iov_len = sizeof(whdr);
17926a79 DH	214	iov[1].iov_base = &word;
	215	iov[1].iov_len = sizeof(word);
	216
	217	len = iov[0].iov_len + iov[1].iov_len;
	218
0d12f8a4 DH	219	serial = atomic_inc_return(&conn->serial);
0d12f8a4 DH	220	whdr.serial = htonl(serial);
dc44b3a0	221	_proto("Tx CONN ABORT %%%u { %d }", serial, conn->local_abort);
17926a79	222
85f32278	223	ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
17926a79 DH	224	if (ret < 0) {
	225	_debug("sendmsg failed: %d", ret);
	226	return -EAGAIN;
	227	}
	228
	229	_leave(" = 0");
	230	return 0;
	231	}
	232
	233	/*
	234	* mark a call as being on a now-secured channel
248f219c	235	* - must be called with BH's disabled.
17926a79	236	*/
5eaa65b2	237	static void rxrpc_call_is_secure(struct rxrpc_call *call)
17926a79 DH	238	{
	239	_enter("%p", call);
	240	if (call) {
248f219c DH	241	write_lock_bh(&call->state_lock);
	242	if (call->state == RXRPC_CALL_SERVER_SECURING) {
	243	call->state = RXRPC_CALL_SERVER_ACCEPTING;
	244	rxrpc_notify_socket(call);
	245	}
	246	write_unlock_bh(&call->state_lock);
17926a79 DH	247	}
	248	}
	249
	250	/*
	251	* connection-level Rx packet processor
	252	*/
	253	static int rxrpc_process_event(struct rxrpc_connection *conn,
	254	struct sk_buff *skb,
	255	u32 *_abort_code)
	256	{
	257	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
0d12f8a4 DH	258	__be32 wtmp;
0d12f8a4 DH	259	u32 abort_code;
17926a79 DH	260	int loop, ret;
17926a79 DH	261
519d2567	262	if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
248f219c	263	_leave(" = -ECONNABORTED [%u]", conn->state);
17926a79	264	return -ECONNABORTED;
519d2567	265	}
17926a79	266
0d12f8a4	267	_enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, sp->hdr.serial);
519d2567	268
17926a79	269	switch (sp->hdr.type) {
18bfeba5 DH	270	case RXRPC_PACKET_TYPE_DATA:
18bfeba5 DH	271	case RXRPC_PACKET_TYPE_ACK:
f5c17aae	272	rxrpc_conn_retransmit_call(conn, skb);
18bfeba5 DH	273	return 0;
18bfeba5 DH	274
17926a79	275	case RXRPC_PACKET_TYPE_ABORT:
248f219c	276	if (skb_copy_bits(skb, sp->offset, &wtmp, sizeof(wtmp)) < 0)
17926a79	277	return -EPROTO;
0d12f8a4 DH	278	abort_code = ntohl(wtmp);
0d12f8a4 DH	279	_proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code);
17926a79 DH	280
17926a79 DH	281	conn->state = RXRPC_CONN_REMOTELY_ABORTED;
248f219c DH	282	rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED,
248f219c DH	283	abort_code, ECONNABORTED);
17926a79 DH	284	return -ECONNABORTED;
	285
	286	case RXRPC_PACKET_TYPE_CHALLENGE:
e0e4d82f DH	287	return conn->security->respond_to_challenge(conn, skb,
e0e4d82f DH	288	_abort_code);
17926a79 DH	289
17926a79 DH	290	case RXRPC_PACKET_TYPE_RESPONSE:
17926a79 DH	291	ret = conn->security->verify_response(conn, skb, _abort_code);
	292	if (ret < 0)
	293	return ret;
	294
	295	ret = conn->security->init_connection_security(conn);
	296	if (ret < 0)
	297	return ret;
	298
a263629d HX	299	ret = conn->security->prime_packet_security(conn);
	300	if (ret < 0)
	301	return ret;
	302
a1399f8b	303	spin_lock(&conn->channel_lock);
17926a79 DH	304	spin_lock(&conn->state_lock);
17926a79 DH	305
bba304db DH	306	if (conn->state == RXRPC_CONN_SERVICE_CHALLENGING) {
bba304db DH	307	conn->state = RXRPC_CONN_SERVICE;
248f219c	308	spin_unlock(&conn->state_lock);
17926a79	309	for (loop = 0; loop < RXRPC_MAXCALLS; loop++)
dee46364 DH	310	rxrpc_call_is_secure(
dee46364 DH	311	rcu_dereference_protected(
a1399f8b DH	312	conn->channels[loop].call,
a1399f8b DH	313	lockdep_is_held(&conn->channel_lock)));
248f219c DH	314	} else {
248f219c DH	315	spin_unlock(&conn->state_lock);
17926a79 DH	316	}
17926a79 DH	317
a1399f8b	318	spin_unlock(&conn->channel_lock);
17926a79 DH	319	return 0;
	320
	321	default:
519d2567	322	_leave(" = -EPROTO [%u]", sp->hdr.type);
17926a79 DH	323	return -EPROTO;
	324	}
	325	}
	326
	327	/*
	328	* set up security and issue a challenge
	329	*/
	330	static void rxrpc_secure_connection(struct rxrpc_connection *conn)
	331	{
	332	u32 abort_code;
	333	int ret;
	334
	335	_enter("{%d}", conn->debug_id);
	336
	337	ASSERT(conn->security_ix != 0);
	338
19ffa01c	339	if (!conn->params.key) {
17926a79 DH	340	_debug("set up security");
	341	ret = rxrpc_init_server_conn_security(conn);
	342	switch (ret) {
	343	case 0:
	344	break;
	345	case -ENOENT:
	346	abort_code = RX_CALL_DEAD;
	347	goto abort;
	348	default:
	349	abort_code = RXKADNOAUTH;
	350	goto abort;
	351	}
	352	}
	353
17926a79 DH	354	if (conn->security->issue_challenge(conn) < 0) {
	355	abort_code = RX_CALL_DEAD;
	356	ret = -ENOMEM;
	357	goto abort;
	358	}
	359
	360	_leave("");
	361	return;
	362
	363	abort:
	364	_debug("abort %d, %d", ret, abort_code);
	365	rxrpc_abort_connection(conn, -ret, abort_code);
	366	_leave(" [aborted]");
	367	}
	368
	369	/*
	370	* connection-level event processor
	371	*/
	372	void rxrpc_process_connection(struct work_struct *work)
	373	{
	374	struct rxrpc_connection *conn =
	375	container_of(work, struct rxrpc_connection, processor);
17926a79 DH	376	struct sk_buff *skb;
	377	u32 abort_code = RX_PROTOCOL_ERROR;
	378	int ret;
	379
	380	_enter("{%d}", conn->debug_id);
	381
2c4579e4	382	if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events))
17926a79	383	rxrpc_secure_connection(conn);
17926a79 DH	384
	385	/* go through the conn-level event packets, releasing the ref on this
	386	* connection that each one has when we've finished with it */
	387	while ((skb = skb_dequeue(&conn->rx_queue))) {
df844fd4	388	rxrpc_see_skb(skb);
17926a79 DH	389	ret = rxrpc_process_event(conn, skb, &abort_code);
	390	switch (ret) {
	391	case -EPROTO:
	392	case -EKEYEXPIRED:
	393	case -EKEYREJECTED:
	394	goto protocol_error;
	395	case -EAGAIN:
	396	goto requeue_and_leave;
	397	case -ECONNABORTED:
	398	default:
17926a79 DH	399	rxrpc_free_skb(skb);
	400	break;
	401	}
	402	}
	403
	404	out:
	405	rxrpc_put_connection(conn);
	406	_leave("");
	407	return;
	408
	409	requeue_and_leave:
	410	skb_queue_head(&conn->rx_queue, skb);
	411	goto out;
	412
	413	protocol_error:
	414	if (rxrpc_abort_connection(conn, -ret, abort_code) < 0)
	415	goto requeue_and_leave;
17926a79 DH	416	rxrpc_free_skb(skb);
	417	_leave(" [EPROTO]");
	418	goto out;
	419	}