[mirror_ubuntu-zesty-kernel.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);
		pkt.whdr.flags		|= RXRPC_SLOW_START_OK;
		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:
		trace_rxrpc_tx_ack(NULL, serial, chan->last_seq, 0,
				   RXRPC_ACK_DUPLICATE, 0);
		_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, sizeof(struct rxrpc_wire_header),
				  &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;

	rxrpc_see_connection(conn);

	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, rxrpc_skb_rx_seen);
		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, rxrpc_skb_rx_freed);
			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, rxrpc_skb_rx_freed);
	_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);
57494343	100	pkt.whdr.flags \|= RXRPC_SLOW_START_OK;
18bfeba5 DH	101	len += sizeof(pkt.ack) + sizeof(pkt.info);
	102	break;
	103	}
	104
	105	/* Resync with __rxrpc_disconnect_call() and check that the last call
	106	* didn't get advanced whilst we were filling out the packets.
	107	*/
	108	smp_rmb();
	109	if (READ_ONCE(chan->last_call) != call_id)
	110	return;
	111
	112	iov.iov_base = &pkt;
	113	iov.iov_len = len;
	114
	115	serial = atomic_inc_return(&conn->serial);
	116	pkt.whdr.serial = htonl(serial);
	117
	118	switch (chan->last_type) {
	119	case RXRPC_PACKET_TYPE_ABORT:
	120	_proto("Tx ABORT %%%u { %d } [re]", serial, conn->local_abort);
	121	break;
	122	case RXRPC_PACKET_TYPE_ACK:
be832aec DH	123	trace_rxrpc_tx_ack(NULL, serial, chan->last_seq, 0,
be832aec DH	124	RXRPC_ACK_DUPLICATE, 0);
18bfeba5 DH	125	_proto("Tx ACK %%%u [re]", serial);
	126	break;
	127	}
	128
	129	kernel_sendmsg(conn->params.local->socket, &msg, &iov, 1, len);
	130	_leave("");
	131	return;
	132	}
	133
17926a79 DH	134	/*
	135	* pass a connection-level abort onto all calls on that connection
	136	*/
f5c17aae DH	137	static void rxrpc_abort_calls(struct rxrpc_connection *conn,
	138	enum rxrpc_call_completion compl,
	139	u32 abort_code, int error)
17926a79 DH	140	{
17926a79 DH	141	struct rxrpc_call *call;
248f219c	142	int i;
17926a79 DH	143
	144	_enter("{%d},%x", conn->debug_id, abort_code);
	145
a1399f8b	146	spin_lock(&conn->channel_lock);
17926a79	147
a1399f8b DH	148	for (i = 0; i < RXRPC_MAXCALLS; i++) {
	149	call = rcu_dereference_protected(
	150	conn->channels[i].call,
	151	lockdep_is_held(&conn->channel_lock));
ccbd3dbe	152	if (call) {
5a42976d DH	153	if (compl == RXRPC_CALL_LOCALLY_ABORTED)
	154	trace_rxrpc_abort("CON", call->cid,
	155	call->call_id, 0,
	156	abort_code, error);
248f219c DH	157	if (rxrpc_set_call_completion(call, compl,
	158	abort_code, error))
	159	rxrpc_notify_socket(call);
17926a79	160	}
17926a79 DH	161	}
17926a79 DH	162
a1399f8b	163	spin_unlock(&conn->channel_lock);
17926a79 DH	164	_leave("");
	165	}
	166
	167	/*
	168	* generate a connection-level abort
	169	*/
	170	static int rxrpc_abort_connection(struct rxrpc_connection *conn,
	171	u32 error, u32 abort_code)
	172	{
0d12f8a4	173	struct rxrpc_wire_header whdr;
17926a79 DH	174	struct msghdr msg;
	175	struct kvec iov[2];
	176	__be32 word;
	177	size_t len;
0d12f8a4	178	u32 serial;
17926a79 DH	179	int ret;
	180
	181	_enter("%d,,%u,%u", conn->debug_id, error, abort_code);
	182
	183	/* generate a connection-level abort */
	184	spin_lock_bh(&conn->state_lock);
f5c17aae	185	if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
17926a79 DH	186	spin_unlock_bh(&conn->state_lock);
	187	_leave(" = 0 [already dead]");
	188	return 0;
	189	}
	190
f5c17aae DH	191	conn->state = RXRPC_CONN_LOCALLY_ABORTED;
	192	spin_unlock_bh(&conn->state_lock);
	193
	194	rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code, error);
17926a79	195
85f32278 DH	196	msg.msg_name = &conn->params.peer->srx.transport;
85f32278 DH	197	msg.msg_namelen = conn->params.peer->srx.transport_len;
17926a79 DH	198	msg.msg_control = NULL;
	199	msg.msg_controllen = 0;
	200	msg.msg_flags = 0;
	201
19ffa01c DH	202	whdr.epoch = htonl(conn->proto.epoch);
19ffa01c DH	203	whdr.cid = htonl(conn->proto.cid);
0d12f8a4 DH	204	whdr.callNumber = 0;
	205	whdr.seq = 0;
	206	whdr.type = RXRPC_PACKET_TYPE_ABORT;
	207	whdr.flags = conn->out_clientflag;
	208	whdr.userStatus = 0;
	209	whdr.securityIndex = conn->security_ix;
	210	whdr._rsvd = 0;
19ffa01c	211	whdr.serviceId = htons(conn->params.service_id);
17926a79	212
dc44b3a0	213	word = htonl(conn->local_abort);
17926a79	214
0d12f8a4 DH	215	iov[0].iov_base = &whdr;
0d12f8a4 DH	216	iov[0].iov_len = sizeof(whdr);
17926a79 DH	217	iov[1].iov_base = &word;
	218	iov[1].iov_len = sizeof(word);
	219
	220	len = iov[0].iov_len + iov[1].iov_len;
	221
0d12f8a4 DH	222	serial = atomic_inc_return(&conn->serial);
0d12f8a4 DH	223	whdr.serial = htonl(serial);
dc44b3a0	224	_proto("Tx CONN ABORT %%%u { %d }", serial, conn->local_abort);
17926a79	225
85f32278	226	ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
17926a79 DH	227	if (ret < 0) {
	228	_debug("sendmsg failed: %d", ret);
	229	return -EAGAIN;
	230	}
	231
	232	_leave(" = 0");
	233	return 0;
	234	}
	235
	236	/*
	237	* mark a call as being on a now-secured channel
248f219c	238	* - must be called with BH's disabled.
17926a79	239	*/
5eaa65b2	240	static void rxrpc_call_is_secure(struct rxrpc_call *call)
17926a79 DH	241	{
	242	_enter("%p", call);
	243	if (call) {
248f219c DH	244	write_lock_bh(&call->state_lock);
	245	if (call->state == RXRPC_CALL_SERVER_SECURING) {
	246	call->state = RXRPC_CALL_SERVER_ACCEPTING;
	247	rxrpc_notify_socket(call);
	248	}
	249	write_unlock_bh(&call->state_lock);
17926a79 DH	250	}
	251	}
	252
	253	/*
	254	* connection-level Rx packet processor
	255	*/
	256	static int rxrpc_process_event(struct rxrpc_connection *conn,
	257	struct sk_buff *skb,
	258	u32 *_abort_code)
	259	{
	260	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
0d12f8a4 DH	261	__be32 wtmp;
0d12f8a4 DH	262	u32 abort_code;
17926a79 DH	263	int loop, ret;
17926a79 DH	264
519d2567	265	if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
248f219c	266	_leave(" = -ECONNABORTED [%u]", conn->state);
17926a79	267	return -ECONNABORTED;
519d2567	268	}
17926a79	269
0d12f8a4	270	_enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, sp->hdr.serial);
519d2567	271
17926a79	272	switch (sp->hdr.type) {
18bfeba5 DH	273	case RXRPC_PACKET_TYPE_DATA:
18bfeba5 DH	274	case RXRPC_PACKET_TYPE_ACK:
f5c17aae	275	rxrpc_conn_retransmit_call(conn, skb);
18bfeba5 DH	276	return 0;
18bfeba5 DH	277
17926a79	278	case RXRPC_PACKET_TYPE_ABORT:
775e5b71 DH	279	if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header),
775e5b71 DH	280	&wtmp, sizeof(wtmp)) < 0)
17926a79	281	return -EPROTO;
0d12f8a4 DH	282	abort_code = ntohl(wtmp);
0d12f8a4 DH	283	_proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code);
17926a79 DH	284
17926a79 DH	285	conn->state = RXRPC_CONN_REMOTELY_ABORTED;
248f219c DH	286	rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED,
248f219c DH	287	abort_code, ECONNABORTED);
17926a79 DH	288	return -ECONNABORTED;
	289
	290	case RXRPC_PACKET_TYPE_CHALLENGE:
e0e4d82f DH	291	return conn->security->respond_to_challenge(conn, skb,
e0e4d82f DH	292	_abort_code);
17926a79 DH	293
17926a79 DH	294	case RXRPC_PACKET_TYPE_RESPONSE:
17926a79 DH	295	ret = conn->security->verify_response(conn, skb, _abort_code);
	296	if (ret < 0)
	297	return ret;
	298
	299	ret = conn->security->init_connection_security(conn);
	300	if (ret < 0)
	301	return ret;
	302
a263629d HX	303	ret = conn->security->prime_packet_security(conn);
	304	if (ret < 0)
	305	return ret;
	306
a1399f8b	307	spin_lock(&conn->channel_lock);
17926a79 DH	308	spin_lock(&conn->state_lock);
17926a79 DH	309
bba304db DH	310	if (conn->state == RXRPC_CONN_SERVICE_CHALLENGING) {
bba304db DH	311	conn->state = RXRPC_CONN_SERVICE;
248f219c	312	spin_unlock(&conn->state_lock);
17926a79	313	for (loop = 0; loop < RXRPC_MAXCALLS; loop++)
dee46364 DH	314	rxrpc_call_is_secure(
dee46364 DH	315	rcu_dereference_protected(
a1399f8b DH	316	conn->channels[loop].call,
a1399f8b DH	317	lockdep_is_held(&conn->channel_lock)));
248f219c DH	318	} else {
248f219c DH	319	spin_unlock(&conn->state_lock);
17926a79 DH	320	}
17926a79 DH	321
a1399f8b	322	spin_unlock(&conn->channel_lock);
17926a79 DH	323	return 0;
	324
	325	default:
519d2567	326	_leave(" = -EPROTO [%u]", sp->hdr.type);
17926a79 DH	327	return -EPROTO;
	328	}
	329	}
	330
	331	/*
	332	* set up security and issue a challenge
	333	*/
	334	static void rxrpc_secure_connection(struct rxrpc_connection *conn)
	335	{
	336	u32 abort_code;
	337	int ret;
	338
	339	_enter("{%d}", conn->debug_id);
	340
	341	ASSERT(conn->security_ix != 0);
	342
19ffa01c	343	if (!conn->params.key) {
17926a79 DH	344	_debug("set up security");
	345	ret = rxrpc_init_server_conn_security(conn);
	346	switch (ret) {
	347	case 0:
	348	break;
	349	case -ENOENT:
	350	abort_code = RX_CALL_DEAD;
	351	goto abort;
	352	default:
	353	abort_code = RXKADNOAUTH;
	354	goto abort;
	355	}
	356	}
	357
17926a79 DH	358	if (conn->security->issue_challenge(conn) < 0) {
	359	abort_code = RX_CALL_DEAD;
	360	ret = -ENOMEM;
	361	goto abort;
	362	}
	363
	364	_leave("");
	365	return;
	366
	367	abort:
	368	_debug("abort %d, %d", ret, abort_code);
	369	rxrpc_abort_connection(conn, -ret, abort_code);
	370	_leave(" [aborted]");
	371	}
	372
	373	/*
	374	* connection-level event processor
	375	*/
	376	void rxrpc_process_connection(struct work_struct *work)
	377	{
	378	struct rxrpc_connection *conn =
	379	container_of(work, struct rxrpc_connection, processor);
17926a79 DH	380	struct sk_buff *skb;
	381	u32 abort_code = RX_PROTOCOL_ERROR;
	382	int ret;
	383
363deeab	384	rxrpc_see_connection(conn);
17926a79	385
2c4579e4	386	if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events))
17926a79	387	rxrpc_secure_connection(conn);
17926a79 DH	388
	389	/* go through the conn-level event packets, releasing the ref on this
	390	* connection that each one has when we've finished with it */
	391	while ((skb = skb_dequeue(&conn->rx_queue))) {
71f3ca40	392	rxrpc_see_skb(skb, rxrpc_skb_rx_seen);
17926a79 DH	393	ret = rxrpc_process_event(conn, skb, &abort_code);
	394	switch (ret) {
	395	case -EPROTO:
	396	case -EKEYEXPIRED:
	397	case -EKEYREJECTED:
	398	goto protocol_error;
	399	case -EAGAIN:
	400	goto requeue_and_leave;
	401	case -ECONNABORTED:
	402	default:
71f3ca40	403	rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
17926a79 DH	404	break;
	405	}
	406	}
	407
	408	out:
	409	rxrpc_put_connection(conn);
	410	_leave("");
	411	return;
	412
	413	requeue_and_leave:
	414	skb_queue_head(&conn->rx_queue, skb);
	415	goto out;
	416
	417	protocol_error:
	418	if (rxrpc_abort_connection(conn, -ret, abort_code) < 0)
	419	goto requeue_and_leave;
71f3ca40	420	rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
17926a79 DH	421	_leave(" [EPROTO]");
	422	goto out;
	423	}