[mirror_ubuntu-bionic-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 <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"

/*
 * 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;
	bool queue;
	int i, bit;

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

	if (compl == RXRPC_CALL_LOCALLY_ABORTED)
		bit = RXRPC_CALL_EV_CONN_ABORT;
	else
		bit = RXRPC_CALL_EV_RCVD_ABORT;

	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) {
			rxrpc_see_call(call);
			write_lock_bh(&call->state_lock);
			if (rxrpc_set_call_completion(call, compl, abort_code,
						      error)) {
				set_bit(bit, &call->events);
				queue = true;
			}
			write_unlock_bh(&call->state_lock);
			if (queue)
				rxrpc_queue_call(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 softirqs disabled
 */
static void rxrpc_call_is_secure(struct rxrpc_call *call)
{
	_enter("%p", call);
	if (call) {
		read_lock(&call->state_lock);
		if (call->state < RXRPC_CALL_COMPLETE &&
		    !test_and_set_bit(RXRPC_CALL_EV_SECURED, &call->events))
			rxrpc_queue_call(call);
		read_unlock(&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) {
		kleave(" = -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, 0, &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, 0, RXRPC_CALL_REMOTELY_ABORTED,
				  abort_code);
		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;
			for (loop = 0; loop < RXRPC_MAXCALLS; loop++)
				rxrpc_call_is_secure(
					rcu_dereference_protected(
						conn->channels[loop].call,
						lockdep_is_held(&conn->channel_lock)));
		}

		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;
}

/*
 * put a packet up for transport-level abort
 */
void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb)
{
	CHECK_SLAB_OKAY(&local->usage);

	skb_queue_tail(&local->reject_queue, skb);
	rxrpc_queue_local(local);
}

/*
 * reject packets through the local endpoint
 */
void rxrpc_reject_packets(struct rxrpc_local *local)
{
	union {
		struct sockaddr sa;
		struct sockaddr_in sin;
	} sa;
	struct rxrpc_skb_priv *sp;
	struct rxrpc_wire_header whdr;
	struct sk_buff *skb;
	struct msghdr msg;
	struct kvec iov[2];
	size_t size;
	__be32 code;

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

	iov[0].iov_base = &whdr;
	iov[0].iov_len = sizeof(whdr);
	iov[1].iov_base = &code;
	iov[1].iov_len = sizeof(code);
	size = sizeof(whdr) + sizeof(code);

	msg.msg_name = &sa;
	msg.msg_control = NULL;
	msg.msg_controllen = 0;
	msg.msg_flags = 0;

	memset(&sa, 0, sizeof(sa));
	sa.sa.sa_family = local->srx.transport.family;
	switch (sa.sa.sa_family) {
	case AF_INET:
		msg.msg_namelen = sizeof(sa.sin);
		break;
	default:
		msg.msg_namelen = 0;
		break;
	}

	memset(&whdr, 0, sizeof(whdr));
	whdr.type = RXRPC_PACKET_TYPE_ABORT;

	while ((skb = skb_dequeue(&local->reject_queue))) {
		rxrpc_see_skb(skb);
		sp = rxrpc_skb(skb);
		switch (sa.sa.sa_family) {
		case AF_INET:
			sa.sin.sin_port = udp_hdr(skb)->source;
			sa.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
			code = htonl(skb->priority);

			whdr.epoch	= htonl(sp->hdr.epoch);
			whdr.cid	= htonl(sp->hdr.cid);
			whdr.callNumber	= htonl(sp->hdr.callNumber);
			whdr.serviceId	= htons(sp->hdr.serviceId);
			whdr.flags	= sp->hdr.flags;
			whdr.flags	^= RXRPC_CLIENT_INITIATED;
			whdr.flags	&= RXRPC_CLIENT_INITIATED;

			kernel_sendmsg(local->socket, &msg, iov, 2, size);
			break;

		default:
			break;
		}

		rxrpc_free_skb(skb);
	}

	_leave("");
}
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>
	18	#include <linux/udp.h>
	19	#include <linux/in.h>
	20	#include <linux/in6.h>
	21	#include <linux/icmp.h>
	22	#include <net/sock.h>
	23	#include <net/af_rxrpc.h>
	24	#include <net/ip.h>
	25	#include "ar-internal.h"
	26
18bfeba5 DH	27	/*
	28	* Retransmit terminal ACK or ABORT of the previous call.
	29	*/
f5c17aae DH	30	static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
f5c17aae DH	31	struct sk_buff *skb)
18bfeba5 DH	32	{
	33	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
	34	struct rxrpc_channel *chan;
	35	struct msghdr msg;
	36	struct kvec iov;
	37	struct {
	38	struct rxrpc_wire_header whdr;
	39	union {
	40	struct {
	41	__be32 code;
	42	} abort;
	43	struct {
	44	struct rxrpc_ackpacket ack;
2266ffde	45	u8 padding[3];
18bfeba5 DH	46	struct rxrpc_ackinfo info;
	47	};
	48	};
	49	} __attribute__((packed)) pkt;
	50	size_t len;
	51	u32 serial, mtu, call_id;
	52
	53	_enter("%d", conn->debug_id);
	54
	55	chan = &conn->channels[sp->hdr.cid & RXRPC_CHANNELMASK];
	56
	57	/* If the last call got moved on whilst we were waiting to run, just
	58	* ignore this packet.
	59	*/
	60	call_id = READ_ONCE(chan->last_call);
	61	/* Sync with __rxrpc_disconnect_call() */
	62	smp_rmb();
	63	if (call_id != sp->hdr.callNumber)
	64	return;
	65
	66	msg.msg_name = &conn->params.peer->srx.transport;
	67	msg.msg_namelen = conn->params.peer->srx.transport_len;
	68	msg.msg_control = NULL;
	69	msg.msg_controllen = 0;
	70	msg.msg_flags = 0;
	71
	72	pkt.whdr.epoch = htonl(sp->hdr.epoch);
	73	pkt.whdr.cid = htonl(sp->hdr.cid);
	74	pkt.whdr.callNumber = htonl(sp->hdr.callNumber);
	75	pkt.whdr.seq = 0;
	76	pkt.whdr.type = chan->last_type;
	77	pkt.whdr.flags = conn->out_clientflag;
	78	pkt.whdr.userStatus = 0;
	79	pkt.whdr.securityIndex = conn->security_ix;
	80	pkt.whdr._rsvd = 0;
	81	pkt.whdr.serviceId = htons(chan->last_service_id);
	82
	83	len = sizeof(pkt.whdr);
	84	switch (chan->last_type) {
	85	case RXRPC_PACKET_TYPE_ABORT:
	86	pkt.abort.code = htonl(chan->last_abort);
	87	len += sizeof(pkt.abort);
	88	break;
	89
	90	case RXRPC_PACKET_TYPE_ACK:
	91	mtu = conn->params.peer->if_mtu;
	92	mtu -= conn->params.peer->hdrsize;
	93	pkt.ack.bufferSpace = 0;
	94	pkt.ack.maxSkew = htons(skb->priority);
	95	pkt.ack.firstPacket = htonl(chan->last_seq);
	96	pkt.ack.previousPacket = htonl(chan->last_seq - 1);
	97	pkt.ack.serial = htonl(sp->hdr.serial);
	98	pkt.ack.reason = RXRPC_ACK_DUPLICATE;
	99	pkt.ack.nAcks = 0;
	100	pkt.info.rxMTU = htonl(rxrpc_rx_mtu);
	101	pkt.info.maxMTU = htonl(mtu);
	102	pkt.info.rwind = htonl(rxrpc_rx_window_size);
	103	pkt.info.jumbo_max = htonl(rxrpc_rx_jumbo_max);
	104	len += sizeof(pkt.ack) + sizeof(pkt.info);
	105	break;
	106	}
	107
	108	/* Resync with __rxrpc_disconnect_call() and check that the last call
	109	* didn't get advanced whilst we were filling out the packets.
110	*/
111	smp_rmb();
112	if (READ_ONCE(chan->last_call) != call_id)
113	return;
114
115	iov.iov_base = &pkt;
116	iov.iov_len = len;
117
118	serial = atomic_inc_return(&conn->serial);
119	pkt.whdr.serial = htonl(serial);
120
121	switch (chan->last_type) {
122	case RXRPC_PACKET_TYPE_ABORT:
123	_proto("Tx ABORT %%%u { %d } [re]", serial, conn->local_abort);
124	break;
125	case RXRPC_PACKET_TYPE_ACK:
126	_proto("Tx ACK %%%u [re]", serial);
127	break;
128	}
129
130	kernel_sendmsg(conn->params.local->socket, &msg, &iov, 1, len);
131	_leave("");
132	return;
133	}
134
17926a79 DH	135	/*
	136	* pass a connection-level abort onto all calls on that connection
	137	*/
f5c17aae DH	138	static void rxrpc_abort_calls(struct rxrpc_connection *conn,
	139	enum rxrpc_call_completion compl,
	140	u32 abort_code, int error)
17926a79 DH	141	{
17926a79 DH	142	struct rxrpc_call *call;
f5c17aae DH	143	bool queue;
f5c17aae DH	144	int i, bit;
17926a79 DH	145
	146	_enter("{%d},%x", conn->debug_id, abort_code);
	147
f5c17aae DH	148	if (compl == RXRPC_CALL_LOCALLY_ABORTED)
	149	bit = RXRPC_CALL_EV_CONN_ABORT;
	150	else
	151	bit = RXRPC_CALL_EV_RCVD_ABORT;
	152
a1399f8b	153	spin_lock(&conn->channel_lock);
17926a79	154
a1399f8b DH	155	for (i = 0; i < RXRPC_MAXCALLS; i++) {
	156	call = rcu_dereference_protected(
	157	conn->channels[i].call,
	158	lockdep_is_held(&conn->channel_lock));
ccbd3dbe	159	if (call) {
e34d4234	160	rxrpc_see_call(call);
ccbd3dbe	161	write_lock_bh(&call->state_lock);
f5c17aae DH	162	if (rxrpc_set_call_completion(call, compl, abort_code,
	163	error)) {
	164	set_bit(bit, &call->events);
	165	queue = true;
dc44b3a0	166	}
ccbd3dbe	167	write_unlock_bh(&call->state_lock);
f5c17aae DH	168	if (queue)
f5c17aae DH	169	rxrpc_queue_call(call);
17926a79	170	}
17926a79 DH	171	}
17926a79 DH	172
a1399f8b	173	spin_unlock(&conn->channel_lock);
17926a79 DH	174	_leave("");
	175	}
	176
	177	/*
	178	* generate a connection-level abort
	179	*/
	180	static int rxrpc_abort_connection(struct rxrpc_connection *conn,
	181	u32 error, u32 abort_code)
	182	{
0d12f8a4	183	struct rxrpc_wire_header whdr;
17926a79 DH	184	struct msghdr msg;
	185	struct kvec iov[2];
	186	__be32 word;
	187	size_t len;
0d12f8a4	188	u32 serial;
17926a79 DH	189	int ret;
	190
	191	_enter("%d,,%u,%u", conn->debug_id, error, abort_code);
	192
	193	/* generate a connection-level abort */
	194	spin_lock_bh(&conn->state_lock);
f5c17aae	195	if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
17926a79 DH	196	spin_unlock_bh(&conn->state_lock);
	197	_leave(" = 0 [already dead]");
	198	return 0;
	199	}
	200
f5c17aae DH	201	conn->state = RXRPC_CONN_LOCALLY_ABORTED;
	202	spin_unlock_bh(&conn->state_lock);
	203
	204	rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code, error);
17926a79	205
85f32278 DH	206	msg.msg_name = &conn->params.peer->srx.transport;
85f32278 DH	207	msg.msg_namelen = conn->params.peer->srx.transport_len;
17926a79 DH	208	msg.msg_control = NULL;
	209	msg.msg_controllen = 0;
	210	msg.msg_flags = 0;
	211
19ffa01c DH	212	whdr.epoch = htonl(conn->proto.epoch);
19ffa01c DH	213	whdr.cid = htonl(conn->proto.cid);
0d12f8a4 DH	214	whdr.callNumber = 0;
	215	whdr.seq = 0;
	216	whdr.type = RXRPC_PACKET_TYPE_ABORT;
	217	whdr.flags = conn->out_clientflag;
	218	whdr.userStatus = 0;
	219	whdr.securityIndex = conn->security_ix;
	220	whdr._rsvd = 0;
19ffa01c	221	whdr.serviceId = htons(conn->params.service_id);
17926a79	222
dc44b3a0	223	word = htonl(conn->local_abort);
17926a79	224
0d12f8a4 DH	225	iov[0].iov_base = &whdr;
0d12f8a4 DH	226	iov[0].iov_len = sizeof(whdr);
17926a79 DH	227	iov[1].iov_base = &word;
	228	iov[1].iov_len = sizeof(word);
	229
	230	len = iov[0].iov_len + iov[1].iov_len;
	231
0d12f8a4 DH	232	serial = atomic_inc_return(&conn->serial);
0d12f8a4 DH	233	whdr.serial = htonl(serial);
dc44b3a0	234	_proto("Tx CONN ABORT %%%u { %d }", serial, conn->local_abort);
17926a79	235
85f32278	236	ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
17926a79 DH	237	if (ret < 0) {
	238	_debug("sendmsg failed: %d", ret);
	239	return -EAGAIN;
	240	}
	241
	242	_leave(" = 0");
	243	return 0;
	244	}
	245
	246	/*
	247	* mark a call as being on a now-secured channel
	248	* - must be called with softirqs disabled
	249	*/
5eaa65b2	250	static void rxrpc_call_is_secure(struct rxrpc_call *call)
17926a79 DH	251	{
	252	_enter("%p", call);
	253	if (call) {
	254	read_lock(&call->state_lock);
	255	if (call->state < RXRPC_CALL_COMPLETE &&
4c198ad1	256	!test_and_set_bit(RXRPC_CALL_EV_SECURED, &call->events))
651350d1	257	rxrpc_queue_call(call);
17926a79 DH	258	read_unlock(&call->state_lock);
	259	}
	260	}
	261
	262	/*
	263	* connection-level Rx packet processor
	264	*/
	265	static int rxrpc_process_event(struct rxrpc_connection *conn,
	266	struct sk_buff *skb,
	267	u32 *_abort_code)
	268	{
	269	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
0d12f8a4 DH	270	__be32 wtmp;
0d12f8a4 DH	271	u32 abort_code;
17926a79 DH	272	int loop, ret;
17926a79 DH	273
519d2567 DH	274	if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
519d2567 DH	275	kleave(" = -ECONNABORTED [%u]", conn->state);
17926a79	276	return -ECONNABORTED;
519d2567	277	}
17926a79	278
0d12f8a4	279	_enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, sp->hdr.serial);
519d2567	280
17926a79	281	switch (sp->hdr.type) {
18bfeba5 DH	282	case RXRPC_PACKET_TYPE_DATA:
18bfeba5 DH	283	case RXRPC_PACKET_TYPE_ACK:
f5c17aae	284	rxrpc_conn_retransmit_call(conn, skb);
18bfeba5 DH	285	return 0;
18bfeba5 DH	286
17926a79	287	case RXRPC_PACKET_TYPE_ABORT:
0d12f8a4	288	if (skb_copy_bits(skb, 0, &wtmp, sizeof(wtmp)) < 0)
17926a79	289	return -EPROTO;
0d12f8a4 DH	290	abort_code = ntohl(wtmp);
0d12f8a4 DH	291	_proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code);
17926a79 DH	292
17926a79 DH	293	conn->state = RXRPC_CONN_REMOTELY_ABORTED;
f5c17aae	294	rxrpc_abort_calls(conn, 0, RXRPC_CALL_REMOTELY_ABORTED,
0d12f8a4	295	abort_code);
17926a79 DH	296	return -ECONNABORTED;
	297
	298	case RXRPC_PACKET_TYPE_CHALLENGE:
e0e4d82f DH	299	return conn->security->respond_to_challenge(conn, skb,
e0e4d82f DH	300	_abort_code);
17926a79 DH	301
17926a79 DH	302	case RXRPC_PACKET_TYPE_RESPONSE:
17926a79 DH	303	ret = conn->security->verify_response(conn, skb, _abort_code);
	304	if (ret < 0)
	305	return ret;
	306
	307	ret = conn->security->init_connection_security(conn);
	308	if (ret < 0)
	309	return ret;
	310
a263629d HX	311	ret = conn->security->prime_packet_security(conn);
	312	if (ret < 0)
	313	return ret;
	314
a1399f8b	315	spin_lock(&conn->channel_lock);
17926a79 DH	316	spin_lock(&conn->state_lock);
17926a79 DH	317
bba304db DH	318	if (conn->state == RXRPC_CONN_SERVICE_CHALLENGING) {
bba304db DH	319	conn->state = RXRPC_CONN_SERVICE;
17926a79	320	for (loop = 0; loop < RXRPC_MAXCALLS; loop++)
dee46364 DH	321	rxrpc_call_is_secure(
dee46364 DH	322	rcu_dereference_protected(
a1399f8b DH	323	conn->channels[loop].call,
a1399f8b DH	324	lockdep_is_held(&conn->channel_lock)));
17926a79 DH	325	}
	326
	327	spin_unlock(&conn->state_lock);
a1399f8b	328	spin_unlock(&conn->channel_lock);
17926a79 DH	329	return 0;
	330
	331	default:
519d2567	332	_leave(" = -EPROTO [%u]", sp->hdr.type);
17926a79 DH	333	return -EPROTO;
	334	}
	335	}
	336
	337	/*
	338	* set up security and issue a challenge
	339	*/
	340	static void rxrpc_secure_connection(struct rxrpc_connection *conn)
	341	{
	342	u32 abort_code;
	343	int ret;
	344
	345	_enter("{%d}", conn->debug_id);
	346
	347	ASSERT(conn->security_ix != 0);
	348
19ffa01c	349	if (!conn->params.key) {
17926a79 DH	350	_debug("set up security");
	351	ret = rxrpc_init_server_conn_security(conn);
	352	switch (ret) {
	353	case 0:
	354	break;
	355	case -ENOENT:
	356	abort_code = RX_CALL_DEAD;
	357	goto abort;
	358	default:
	359	abort_code = RXKADNOAUTH;
	360	goto abort;
	361	}
	362	}
	363
17926a79 DH	364	if (conn->security->issue_challenge(conn) < 0) {
	365	abort_code = RX_CALL_DEAD;
	366	ret = -ENOMEM;
	367	goto abort;
	368	}
	369
	370	_leave("");
	371	return;
	372
	373	abort:
	374	_debug("abort %d, %d", ret, abort_code);
	375	rxrpc_abort_connection(conn, -ret, abort_code);
	376	_leave(" [aborted]");
	377	}
	378
	379	/*
	380	* connection-level event processor
	381	*/
	382	void rxrpc_process_connection(struct work_struct *work)
	383	{
	384	struct rxrpc_connection *conn =
	385	container_of(work, struct rxrpc_connection, processor);
17926a79 DH	386	struct sk_buff *skb;
	387	u32 abort_code = RX_PROTOCOL_ERROR;
	388	int ret;
	389
	390	_enter("{%d}", conn->debug_id);
	391
2c4579e4	392	if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events))
17926a79	393	rxrpc_secure_connection(conn);
17926a79 DH	394
	395	/* go through the conn-level event packets, releasing the ref on this
	396	* connection that each one has when we've finished with it */
	397	while ((skb = skb_dequeue(&conn->rx_queue))) {
df844fd4	398	rxrpc_see_skb(skb);
17926a79 DH	399	ret = rxrpc_process_event(conn, skb, &abort_code);
	400	switch (ret) {
	401	case -EPROTO:
	402	case -EKEYEXPIRED:
	403	case -EKEYREJECTED:
	404	goto protocol_error;
	405	case -EAGAIN:
	406	goto requeue_and_leave;
	407	case -ECONNABORTED:
	408	default:
17926a79 DH	409	rxrpc_free_skb(skb);
	410	break;
	411	}
	412	}
	413
	414	out:
	415	rxrpc_put_connection(conn);
	416	_leave("");
	417	return;
	418
	419	requeue_and_leave:
	420	skb_queue_head(&conn->rx_queue, skb);
	421	goto out;
	422
	423	protocol_error:
	424	if (rxrpc_abort_connection(conn, -ret, abort_code) < 0)
	425	goto requeue_and_leave;
17926a79 DH	426	rxrpc_free_skb(skb);
	427	_leave(" [EPROTO]");
	428	goto out;
	429	}
	430
651350d1 DH	431	/*
	432	* put a packet up for transport-level abort
	433	*/
	434	void rxrpc_reject_packet(struct rxrpc_local local, struct sk_buff skb)
	435	{
	436	CHECK_SLAB_OKAY(&local->usage);
	437
651350d1	438	skb_queue_tail(&local->reject_queue, skb);
5acbee46	439	rxrpc_queue_local(local);
651350d1 DH	440	}
651350d1 DH	441
17926a79 DH	442	/*
	443	* reject packets through the local endpoint
	444	*/
4f95dd78	445	void rxrpc_reject_packets(struct rxrpc_local *local)
17926a79 DH	446	{
	447	union {
	448	struct sockaddr sa;
	449	struct sockaddr_in sin;
	450	} sa;
	451	struct rxrpc_skb_priv *sp;
0d12f8a4	452	struct rxrpc_wire_header whdr;
17926a79 DH	453	struct sk_buff *skb;
	454	struct msghdr msg;
	455	struct kvec iov[2];
	456	size_t size;
	457	__be32 code;
	458
17926a79 DH	459	_enter("%d", local->debug_id);
17926a79 DH	460
0d12f8a4 DH	461	iov[0].iov_base = &whdr;
0d12f8a4 DH	462	iov[0].iov_len = sizeof(whdr);
17926a79 DH	463	iov[1].iov_base = &code;
17926a79 DH	464	iov[1].iov_len = sizeof(code);
0d12f8a4	465	size = sizeof(whdr) + sizeof(code);
17926a79 DH	466
	467	msg.msg_name = &sa;
	468	msg.msg_control = NULL;
	469	msg.msg_controllen = 0;
	470	msg.msg_flags = 0;
	471
	472	memset(&sa, 0, sizeof(sa));
	473	sa.sa.sa_family = local->srx.transport.family;
	474	switch (sa.sa.sa_family) {
	475	case AF_INET:
	476	msg.msg_namelen = sizeof(sa.sin);
	477	break;
	478	default:
	479	msg.msg_namelen = 0;
	480	break;
	481	}
	482
0d12f8a4 DH	483	memset(&whdr, 0, sizeof(whdr));
0d12f8a4 DH	484	whdr.type = RXRPC_PACKET_TYPE_ABORT;
17926a79 DH	485
17926a79 DH	486	while ((skb = skb_dequeue(&local->reject_queue))) {
df844fd4	487	rxrpc_see_skb(skb);
17926a79 DH	488	sp = rxrpc_skb(skb);
	489	switch (sa.sa.sa_family) {
	490	case AF_INET:
	491	sa.sin.sin_port = udp_hdr(skb)->source;
	492	sa.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
	493	code = htonl(skb->priority);
	494
0d12f8a4 DH	495	whdr.epoch = htonl(sp->hdr.epoch);
	496	whdr.cid = htonl(sp->hdr.cid);
	497	whdr.callNumber = htonl(sp->hdr.callNumber);
	498	whdr.serviceId = htons(sp->hdr.serviceId);
	499	whdr.flags = sp->hdr.flags;
	500	whdr.flags ^= RXRPC_CLIENT_INITIATED;
	501	whdr.flags &= RXRPC_CLIENT_INITIATED;
17926a79 DH	502
	503	kernel_sendmsg(local->socket, &msg, iov, 2, size);
	504	break;
	505
	506	default:
	507	break;
	508	}
	509
	510	rxrpc_free_skb(skb);
17926a79 DH	511	}
17926a79 DH	512
17926a79 DH	513	_leave("");
17926a79 DH	514	}