[linux-2.6-block.git] / net / rxrpc / output.c

/* RxRPC packet transmission
 *
 * 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/net.h>
#include <linux/gfp.h>
#include <linux/skbuff.h>
#include <linux/export.h>
#include <net/sock.h>
#include <net/af_rxrpc.h>
#include "ar-internal.h"

struct rxrpc_pkt_buffer {
	struct rxrpc_wire_header whdr;
	union {
		struct {
			struct rxrpc_ackpacket ack;
			u8 acks[255];
			u8 pad[3];
		};
		__be32 abort_code;
	};
	struct rxrpc_ackinfo ackinfo;
};

/*
 * Fill out an ACK packet.
 */
static size_t rxrpc_fill_out_ack(struct rxrpc_call *call,
				 struct rxrpc_pkt_buffer *pkt)
{
	rxrpc_serial_t serial;
	rxrpc_seq_t hard_ack, top, seq;
	int ix;
	u32 mtu, jmax;
	u8 *ackp = pkt->acks;

	/* Barrier against rxrpc_input_data(). */
	serial = call->ackr_serial;
	hard_ack = READ_ONCE(call->rx_hard_ack);
	top = smp_load_acquire(&call->rx_top);

	pkt->ack.bufferSpace	= htons(8);
	pkt->ack.maxSkew	= htons(call->ackr_skew);
	pkt->ack.firstPacket	= htonl(hard_ack + 1);
	pkt->ack.previousPacket	= htonl(call->ackr_prev_seq);
	pkt->ack.serial		= htonl(serial);
	pkt->ack.reason		= call->ackr_reason;
	pkt->ack.nAcks		= top - hard_ack;

	if (after(top, hard_ack)) {
		seq = hard_ack + 1;
		do {
			ix = seq & RXRPC_RXTX_BUFF_MASK;
			if (call->rxtx_buffer[ix])
				*ackp++ = RXRPC_ACK_TYPE_ACK;
			else
				*ackp++ = RXRPC_ACK_TYPE_NACK;
			seq++;
		} while (before_eq(seq, top));
	}

	mtu = call->conn->params.peer->if_mtu;
	mtu -= call->conn->params.peer->hdrsize;
	jmax = (call->nr_jumbo_bad > 3) ? 1 : rxrpc_rx_jumbo_max;
	pkt->ackinfo.rxMTU	= htonl(rxrpc_rx_mtu);
	pkt->ackinfo.maxMTU	= htonl(mtu);
	pkt->ackinfo.rwind	= htonl(call->rx_winsize);
	pkt->ackinfo.jumbo_max	= htonl(jmax);

	trace_rxrpc_tx_ack(call, hard_ack + 1, serial, call->ackr_reason,
			   top - hard_ack);

	*ackp++ = 0;
	*ackp++ = 0;
	*ackp++ = 0;
	return top - hard_ack + 3;
}

/*
 * Send an ACK or ABORT call packet.
 */
int rxrpc_send_call_packet(struct rxrpc_call *call, u8 type)
{
	struct rxrpc_connection *conn = NULL;
	struct rxrpc_pkt_buffer *pkt;
	struct msghdr msg;
	struct kvec iov[2];
	rxrpc_serial_t serial;
	size_t len, n;
	int ioc, ret;
	u32 abort_code;

	_enter("%u,%s", call->debug_id, rxrpc_pkts[type]);

	spin_lock_bh(&call->lock);
	if (call->conn)
		conn = rxrpc_get_connection_maybe(call->conn);
	spin_unlock_bh(&call->lock);
	if (!conn)
		return -ECONNRESET;

	pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
	if (!pkt) {
		rxrpc_put_connection(conn);
		return -ENOMEM;
	}

	serial = atomic_inc_return(&conn->serial);

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

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

	iov[0].iov_base	= pkt;
	iov[0].iov_len	= sizeof(pkt->whdr);
	len = sizeof(pkt->whdr);

	switch (type) {
	case RXRPC_PACKET_TYPE_ACK:
		spin_lock_bh(&call->lock);
		if (!call->ackr_reason) {
			spin_unlock_bh(&call->lock);
			ret = 0;
			goto out;
		}
		n = rxrpc_fill_out_ack(call, pkt);
		call->ackr_reason = 0;

		spin_unlock_bh(&call->lock);

		_proto("Tx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }",
		       serial,
		       ntohs(pkt->ack.maxSkew),
		       ntohl(pkt->ack.firstPacket),
		       ntohl(pkt->ack.previousPacket),
		       ntohl(pkt->ack.serial),
		       rxrpc_acks(pkt->ack.reason),
		       pkt->ack.nAcks);

		iov[0].iov_len += sizeof(pkt->ack) + n;
		iov[1].iov_base = &pkt->ackinfo;
		iov[1].iov_len	= sizeof(pkt->ackinfo);
		len += sizeof(pkt->ack) + n + sizeof(pkt->ackinfo);
		ioc = 2;
		break;

	case RXRPC_PACKET_TYPE_ABORT:
		abort_code = call->abort_code;
		pkt->abort_code = htonl(abort_code);
		_proto("Tx ABORT %%%u { %d }", serial, abort_code);
		iov[0].iov_len += sizeof(pkt->abort_code);
		len += sizeof(pkt->abort_code);
		ioc = 1;
		break;

	default:
		BUG();
		ret = -ENOANO;
		goto out;
	}

	ret = kernel_sendmsg(conn->params.local->socket,
			     &msg, iov, ioc, len);

	if (ret < 0 && call->state < RXRPC_CALL_COMPLETE) {
		switch (type) {
		case RXRPC_PACKET_TYPE_ACK:
			rxrpc_propose_ACK(call, pkt->ack.reason,
					  ntohs(pkt->ack.maxSkew),
					  ntohl(pkt->ack.serial),
					  true, true);
			break;
		case RXRPC_PACKET_TYPE_ABORT:
			break;
		}
	}

out:
	rxrpc_put_connection(conn);
	kfree(pkt);
	return ret;
}

/*
 * send a packet through the transport endpoint
 */
int rxrpc_send_data_packet(struct rxrpc_connection *conn, struct sk_buff *skb)
{
	struct kvec iov[1];
	struct msghdr msg;
	int ret, opt;

	_enter(",{%d}", skb->len);

	iov[0].iov_base = skb->head;
	iov[0].iov_len = skb->len;

	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;

	if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) {
		static int lose;
		if ((lose++ & 7) == 7) {
			rxrpc_lose_skb(skb, rxrpc_skb_tx_lost);
			_leave(" = 0 [lose]");
			return 0;
		}
	}

	/* send the packet with the don't fragment bit set if we currently
	 * think it's small enough */
	if (skb->len - sizeof(struct rxrpc_wire_header) < conn->params.peer->maxdata) {
		down_read(&conn->params.local->defrag_sem);
		/* send the packet by UDP
		 * - returns -EMSGSIZE if UDP would have to fragment the packet
		 *   to go out of the interface
		 *   - in which case, we'll have processed the ICMP error
		 *     message and update the peer record
		 */
		ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 1,
				     iov[0].iov_len);

		up_read(&conn->params.local->defrag_sem);
		if (ret == -EMSGSIZE)
			goto send_fragmentable;

		_leave(" = %d [%u]", ret, conn->params.peer->maxdata);
		return ret;
	}

send_fragmentable:
	/* attempt to send this message with fragmentation enabled */
	_debug("send fragment");

	down_write(&conn->params.local->defrag_sem);

	switch (conn->params.local->srx.transport.family) {
	case AF_INET:
		opt = IP_PMTUDISC_DONT;
		ret = kernel_setsockopt(conn->params.local->socket,
					SOL_IP, IP_MTU_DISCOVER,
					(char *)&opt, sizeof(opt));
		if (ret == 0) {
			ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 1,
					     iov[0].iov_len);

			opt = IP_PMTUDISC_DO;
			kernel_setsockopt(conn->params.local->socket, SOL_IP,
					  IP_MTU_DISCOVER,
					  (char *)&opt, sizeof(opt));
		}
		break;

#ifdef CONFIG_AF_RXRPC_IPV6
	case AF_INET6:
		opt = IPV6_PMTUDISC_DONT;
		ret = kernel_setsockopt(conn->params.local->socket,
					SOL_IPV6, IPV6_MTU_DISCOVER,
					(char *)&opt, sizeof(opt));
		if (ret == 0) {
			ret = kernel_sendmsg(conn->params.local->socket, &msg,
					     iov, 1, iov[0].iov_len);

			opt = IPV6_PMTUDISC_DO;
			kernel_setsockopt(conn->params.local->socket,
					  SOL_IPV6, IPV6_MTU_DISCOVER,
					  (char *)&opt, sizeof(opt));
		}
		break;
#endif
	}

	up_write(&conn->params.local->defrag_sem);
	_leave(" = %d [frag %u]", ret, conn->params.peer->maxdata);
	return ret;
}

/*
 * reject packets through the local endpoint
 */
void rxrpc_reject_packets(struct rxrpc_local *local)
{
	struct sockaddr_rxrpc srx;
	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 = &srx.transport;
	msg.msg_control = NULL;
	msg.msg_controllen = 0;
	msg.msg_flags = 0;

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

	while ((skb = skb_dequeue(&local->reject_queue))) {
		rxrpc_see_skb(skb, rxrpc_skb_rx_seen);
		sp = rxrpc_skb(skb);

		if (rxrpc_extract_addr_from_skb(&srx, skb) == 0) {
			msg.msg_namelen = srx.transport_len;

			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);
		}

		rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
	}

	_leave("");
}
Commit	Line	Data
17926a79 DH	1	/* RxRPC packet transmission
	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	14	#include <linux/net.h>
5a0e3ad6	15	#include <linux/gfp.h>
17926a79	16	#include <linux/skbuff.h>
bc3b2d7f	17	#include <linux/export.h>
17926a79 DH	18	#include <net/sock.h>
	19	#include <net/af_rxrpc.h>
	20	#include "ar-internal.h"
	21
8d94aa38 DH	22	struct rxrpc_pkt_buffer {
	23	struct rxrpc_wire_header whdr;
	24	union {
	25	struct {
	26	struct rxrpc_ackpacket ack;
	27	u8 acks[255];
	28	u8 pad[3];
	29	};
	30	__be32 abort_code;
	31	};
	32	struct rxrpc_ackinfo ackinfo;
	33	};
	34
	35	/*
	36	* Fill out an ACK packet.
	37	*/
	38	static size_t rxrpc_fill_out_ack(struct rxrpc_call *call,
	39	struct rxrpc_pkt_buffer *pkt)
	40	{
f3639df2	41	rxrpc_serial_t serial;
248f219c DH	42	rxrpc_seq_t hard_ack, top, seq;
248f219c DH	43	int ix;
8d94aa38 DH	44	u32 mtu, jmax;
	45	u8 *ackp = pkt->acks;
	46
248f219c	47	/* Barrier against rxrpc_input_data(). */
f3639df2	48	serial = call->ackr_serial;
248f219c DH	49	hard_ack = READ_ONCE(call->rx_hard_ack);
	50	top = smp_load_acquire(&call->rx_top);
	51
8d94aa38	52	pkt->ack.bufferSpace = htons(8);
248f219c DH	53	pkt->ack.maxSkew = htons(call->ackr_skew);
248f219c DH	54	pkt->ack.firstPacket = htonl(hard_ack + 1);
8d94aa38	55	pkt->ack.previousPacket = htonl(call->ackr_prev_seq);
f3639df2	56	pkt->ack.serial = htonl(serial);
248f219c DH	57	pkt->ack.reason = call->ackr_reason;
	58	pkt->ack.nAcks = top - hard_ack;
	59
	60	if (after(top, hard_ack)) {
	61	seq = hard_ack + 1;
	62	do {
	63	ix = seq & RXRPC_RXTX_BUFF_MASK;
	64	if (call->rxtx_buffer[ix])
	65	*ackp++ = RXRPC_ACK_TYPE_ACK;
	66	else
	67	*ackp++ = RXRPC_ACK_TYPE_NACK;
	68	seq++;
	69	} while (before_eq(seq, top));
	70	}
8d94aa38	71
248f219c DH	72	mtu = call->conn->params.peer->if_mtu;
248f219c DH	73	mtu -= call->conn->params.peer->hdrsize;
75e42126	74	jmax = (call->nr_jumbo_bad > 3) ? 1 : rxrpc_rx_jumbo_max;
8d94aa38 DH	75	pkt->ackinfo.rxMTU = htonl(rxrpc_rx_mtu);
8d94aa38 DH	76	pkt->ackinfo.maxMTU = htonl(mtu);
75e42126	77	pkt->ackinfo.rwind = htonl(call->rx_winsize);
8d94aa38 DH	78	pkt->ackinfo.jumbo_max = htonl(jmax);
8d94aa38 DH	79
f3639df2 DH	80	trace_rxrpc_tx_ack(call, hard_ack + 1, serial, call->ackr_reason,
	81	top - hard_ack);
	82
8d94aa38 DH	83	*ackp++ = 0;
	84	*ackp++ = 0;
	85	*ackp++ = 0;
248f219c	86	return top - hard_ack + 3;
8d94aa38 DH	87	}
	88
	89	/*
248f219c	90	* Send an ACK or ABORT call packet.
8d94aa38 DH	91	*/
	92	int rxrpc_send_call_packet(struct rxrpc_call *call, u8 type)
	93	{
	94	struct rxrpc_connection *conn = NULL;
	95	struct rxrpc_pkt_buffer *pkt;
	96	struct msghdr msg;
	97	struct kvec iov[2];
	98	rxrpc_serial_t serial;
	99	size_t len, n;
	100	int ioc, ret;
	101	u32 abort_code;
	102
	103	_enter("%u,%s", call->debug_id, rxrpc_pkts[type]);
	104
	105	spin_lock_bh(&call->lock);
	106	if (call->conn)
	107	conn = rxrpc_get_connection_maybe(call->conn);
	108	spin_unlock_bh(&call->lock);
	109	if (!conn)
	110	return -ECONNRESET;
	111
	112	pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
	113	if (!pkt) {
	114	rxrpc_put_connection(conn);
	115	return -ENOMEM;
	116	}
	117
	118	serial = atomic_inc_return(&conn->serial);
	119
	120	msg.msg_name = &call->peer->srx.transport;
	121	msg.msg_namelen = call->peer->srx.transport_len;
	122	msg.msg_control = NULL;
	123	msg.msg_controllen = 0;
	124	msg.msg_flags = 0;
	125
	126	pkt->whdr.epoch = htonl(conn->proto.epoch);
	127	pkt->whdr.cid = htonl(call->cid);
	128	pkt->whdr.callNumber = htonl(call->call_id);
	129	pkt->whdr.seq = 0;
	130	pkt->whdr.serial = htonl(serial);
	131	pkt->whdr.type = type;
	132	pkt->whdr.flags = conn->out_clientflag;
	133	pkt->whdr.userStatus = 0;
	134	pkt->whdr.securityIndex = call->security_ix;
	135	pkt->whdr._rsvd = 0;
	136	pkt->whdr.serviceId = htons(call->service_id);
	137
	138	iov[0].iov_base = pkt;
	139	iov[0].iov_len = sizeof(pkt->whdr);
	140	len = sizeof(pkt->whdr);
	141
	142	switch (type) {
	143	case RXRPC_PACKET_TYPE_ACK:
	144	spin_lock_bh(&call->lock);
27d0fc43 DH	145	if (!call->ackr_reason) {
	146	spin_unlock_bh(&call->lock);
	147	ret = 0;
	148	goto out;
	149	}
8d94aa38 DH	150	n = rxrpc_fill_out_ack(call, pkt);
	151	call->ackr_reason = 0;
	152
	153	spin_unlock_bh(&call->lock);
	154
	155	_proto("Tx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }",
	156	serial,
	157	ntohs(pkt->ack.maxSkew),
	158	ntohl(pkt->ack.firstPacket),
	159	ntohl(pkt->ack.previousPacket),
	160	ntohl(pkt->ack.serial),
	161	rxrpc_acks(pkt->ack.reason),
	162	pkt->ack.nAcks);
	163
	164	iov[0].iov_len += sizeof(pkt->ack) + n;
	165	iov[1].iov_base = &pkt->ackinfo;
	166	iov[1].iov_len = sizeof(pkt->ackinfo);
	167	len += sizeof(pkt->ack) + n + sizeof(pkt->ackinfo);
	168	ioc = 2;
	169	break;
	170
	171	case RXRPC_PACKET_TYPE_ABORT:
	172	abort_code = call->abort_code;
	173	pkt->abort_code = htonl(abort_code);
	174	_proto("Tx ABORT %%%u { %d }", serial, abort_code);
	175	iov[0].iov_len += sizeof(pkt->abort_code);
	176	len += sizeof(pkt->abort_code);
	177	ioc = 1;
	178	break;
	179
	180	default:
	181	BUG();
	182	ret = -ENOANO;
	183	goto out;
	184	}
	185
	186	ret = kernel_sendmsg(conn->params.local->socket,
	187	&msg, iov, ioc, len);
	188
248f219c	189	if (ret < 0 && call->state < RXRPC_CALL_COMPLETE) {
2311e327	190	switch (type) {
248f219c DH	191	case RXRPC_PACKET_TYPE_ACK:
	192	rxrpc_propose_ACK(call, pkt->ack.reason,
	193	ntohs(pkt->ack.maxSkew),
	194	ntohl(pkt->ack.serial),
	195	true, true);
	196	break;
	197	case RXRPC_PACKET_TYPE_ABORT:
	198	break;
	199	}
	200	}
	201
8d94aa38 DH	202	out:
	203	rxrpc_put_connection(conn);
	204	kfree(pkt);
	205	return ret;
	206	}
	207
17926a79 DH	208	/*
	209	* send a packet through the transport endpoint
	210	*/
985a5c82	211	int rxrpc_send_data_packet(struct rxrpc_connection conn, struct sk_buff skb)
17926a79 DH	212	{
	213	struct kvec iov[1];
	214	struct msghdr msg;
	215	int ret, opt;
	216
	217	_enter(",{%d}", skb->len);
	218
	219	iov[0].iov_base = skb->head;
	220	iov[0].iov_len = skb->len;
	221
985a5c82 DH	222	msg.msg_name = &conn->params.peer->srx.transport;
985a5c82 DH	223	msg.msg_namelen = conn->params.peer->srx.transport_len;
17926a79 DH	224	msg.msg_control = NULL;
	225	msg.msg_controllen = 0;
	226	msg.msg_flags = 0;
	227
8a681c36 DH	228	if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) {
	229	static int lose;
	230	if ((lose++ & 7) == 7) {
	231	rxrpc_lose_skb(skb, rxrpc_skb_tx_lost);
	232	_leave(" = 0 [lose]");
	233	return 0;
	234	}
	235	}
	236
17926a79 DH	237	/* send the packet with the don't fragment bit set if we currently
17926a79 DH	238	* think it's small enough */
985a5c82 DH	239	if (skb->len - sizeof(struct rxrpc_wire_header) < conn->params.peer->maxdata) {
985a5c82 DH	240	down_read(&conn->params.local->defrag_sem);
17926a79 DH	241	/* send the packet by UDP
	242	* - returns -EMSGSIZE if UDP would have to fragment the packet
	243	* to go out of the interface
	244	* - in which case, we'll have processed the ICMP error
	245	* message and update the peer record
	246	*/
985a5c82	247	ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 1,
17926a79 DH	248	iov[0].iov_len);
17926a79 DH	249
985a5c82	250	up_read(&conn->params.local->defrag_sem);
17926a79 DH	251	if (ret == -EMSGSIZE)
	252	goto send_fragmentable;
	253
985a5c82	254	_leave(" = %d [%u]", ret, conn->params.peer->maxdata);
17926a79 DH	255	return ret;
	256	}
	257
	258	send_fragmentable:
	259	/* attempt to send this message with fragmentation enabled */
	260	_debug("send fragment");
	261
985a5c82 DH	262	down_write(&conn->params.local->defrag_sem);
	263
	264	switch (conn->params.local->srx.transport.family) {
	265	case AF_INET:
	266	opt = IP_PMTUDISC_DONT;
	267	ret = kernel_setsockopt(conn->params.local->socket,
	268	SOL_IP, IP_MTU_DISCOVER,
	269	(char *)&opt, sizeof(opt));
	270	if (ret == 0) {
	271	ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 1,
	272	iov[0].iov_len);
	273
	274	opt = IP_PMTUDISC_DO;
	275	kernel_setsockopt(conn->params.local->socket, SOL_IP,
	276	IP_MTU_DISCOVER,
	277	(char *)&opt, sizeof(opt));
	278	}
	279	break;
75b54cb5	280
d1912747	281	#ifdef CONFIG_AF_RXRPC_IPV6
75b54cb5 DH	282	case AF_INET6:
	283	opt = IPV6_PMTUDISC_DONT;
	284	ret = kernel_setsockopt(conn->params.local->socket,
	285	SOL_IPV6, IPV6_MTU_DISCOVER,
	286	(char *)&opt, sizeof(opt));
	287	if (ret == 0) {
	288	ret = kernel_sendmsg(conn->params.local->socket, &msg,
	289	iov, 1, iov[0].iov_len);
	290
	291	opt = IPV6_PMTUDISC_DO;
	292	kernel_setsockopt(conn->params.local->socket,
	293	SOL_IPV6, IPV6_MTU_DISCOVER,
	294	(char *)&opt, sizeof(opt));
	295	}
	296	break;
d1912747	297	#endif
17926a79 DH	298	}
17926a79 DH	299
985a5c82 DH	300	up_write(&conn->params.local->defrag_sem);
985a5c82 DH	301	_leave(" = %d [frag %u]", ret, conn->params.peer->maxdata);
17926a79 DH	302	return ret;
17926a79 DH	303	}
248f219c DH	304
	305	/*
	306	* reject packets through the local endpoint
	307	*/
	308	void rxrpc_reject_packets(struct rxrpc_local *local)
	309	{
1c2bc7b9	310	struct sockaddr_rxrpc srx;
248f219c DH	311	struct rxrpc_skb_priv *sp;
	312	struct rxrpc_wire_header whdr;
	313	struct sk_buff *skb;
	314	struct msghdr msg;
	315	struct kvec iov[2];
	316	size_t size;
	317	__be32 code;
	318
	319	_enter("%d", local->debug_id);
	320
	321	iov[0].iov_base = &whdr;
	322	iov[0].iov_len = sizeof(whdr);
	323	iov[1].iov_base = &code;
	324	iov[1].iov_len = sizeof(code);
	325	size = sizeof(whdr) + sizeof(code);
	326
1c2bc7b9	327	msg.msg_name = &srx.transport;
248f219c DH	328	msg.msg_control = NULL;
	329	msg.msg_controllen = 0;
	330	msg.msg_flags = 0;
	331
248f219c DH	332	memset(&whdr, 0, sizeof(whdr));
	333	whdr.type = RXRPC_PACKET_TYPE_ABORT;
	334
	335	while ((skb = skb_dequeue(&local->reject_queue))) {
71f3ca40	336	rxrpc_see_skb(skb, rxrpc_skb_rx_seen);
248f219c	337	sp = rxrpc_skb(skb);
1c2bc7b9 DH	338
	339	if (rxrpc_extract_addr_from_skb(&srx, skb) == 0) {
	340	msg.msg_namelen = srx.transport_len;
	341
248f219c DH	342	code = htonl(skb->priority);
	343
	344	whdr.epoch = htonl(sp->hdr.epoch);
	345	whdr.cid = htonl(sp->hdr.cid);
	346	whdr.callNumber = htonl(sp->hdr.callNumber);
	347	whdr.serviceId = htons(sp->hdr.serviceId);
	348	whdr.flags = sp->hdr.flags;
	349	whdr.flags ^= RXRPC_CLIENT_INITIATED;
	350	whdr.flags &= RXRPC_CLIENT_INITIATED;
	351
	352	kernel_sendmsg(local->socket, &msg, iov, 2, size);
248f219c DH	353	}
248f219c DH	354
71f3ca40	355	rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
248f219c DH	356	}
	357
	358	_leave("");
	359	}