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

/* Peer event handling, typically ICMP messages.
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/net.h>
#include <linux/skbuff.h>
#include <linux/errqueue.h>
#include <linux/udp.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/icmp.h>
#include <net/sock.h>
#include <net/af_rxrpc.h>
#include <net/ip.h>
#include "ar-internal.h"

static void rxrpc_store_error(struct rxrpc_peer *, struct sock_exterr_skb *);
static void rxrpc_distribute_error(struct rxrpc_peer *, int,
				   enum rxrpc_call_completion);

/*
 * Find the peer associated with an ICMP packet.
 */
static struct rxrpc_peer *rxrpc_lookup_peer_icmp_rcu(struct rxrpc_local *local,
						     const struct sk_buff *skb,
						     struct sockaddr_rxrpc *srx)
{
	struct sock_exterr_skb *serr = SKB_EXT_ERR(skb);

	_enter("");

	memset(srx, 0, sizeof(*srx));
	srx->transport_type = local->srx.transport_type;
	srx->transport_len = local->srx.transport_len;
	srx->transport.family = local->srx.transport.family;

	/* Can we see an ICMP4 packet on an ICMP6 listening socket?  and vice
	 * versa?
	 */
	switch (srx->transport.family) {
	case AF_INET:
		srx->transport_len = sizeof(srx->transport.sin);
		srx->transport.family = AF_INET;
		srx->transport.sin.sin_port = serr->port;
		switch (serr->ee.ee_origin) {
		case SO_EE_ORIGIN_ICMP:
			_net("Rx ICMP");
			memcpy(&srx->transport.sin.sin_addr,
			       skb_network_header(skb) + serr->addr_offset,
			       sizeof(struct in_addr));
			break;
		case SO_EE_ORIGIN_ICMP6:
			_net("Rx ICMP6 on v4 sock");
			memcpy(&srx->transport.sin.sin_addr,
			       skb_network_header(skb) + serr->addr_offset + 12,
			       sizeof(struct in_addr));
			break;
		default:
			memcpy(&srx->transport.sin.sin_addr, &ip_hdr(skb)->saddr,
			       sizeof(struct in_addr));
			break;
		}
		break;

#ifdef CONFIG_AF_RXRPC_IPV6
	case AF_INET6:
		switch (serr->ee.ee_origin) {
		case SO_EE_ORIGIN_ICMP6:
			_net("Rx ICMP6");
			srx->transport.sin6.sin6_port = serr->port;
			memcpy(&srx->transport.sin6.sin6_addr,
			       skb_network_header(skb) + serr->addr_offset,
			       sizeof(struct in6_addr));
			break;
		case SO_EE_ORIGIN_ICMP:
			_net("Rx ICMP on v6 sock");
			srx->transport_len = sizeof(srx->transport.sin);
			srx->transport.family = AF_INET;
			srx->transport.sin.sin_port = serr->port;
			memcpy(&srx->transport.sin.sin_addr,
			       skb_network_header(skb) + serr->addr_offset,
			       sizeof(struct in_addr));
			break;
		default:
			memcpy(&srx->transport.sin6.sin6_addr,
			       &ipv6_hdr(skb)->saddr,
			       sizeof(struct in6_addr));
			break;
		}
		break;
#endif

	default:
		BUG();
	}

	return rxrpc_lookup_peer_rcu(local, srx);
}

/*
 * Handle an MTU/fragmentation problem.
 */
static void rxrpc_adjust_mtu(struct rxrpc_peer *peer, struct sock_exterr_skb *serr)
{
	u32 mtu = serr->ee.ee_info;

	_net("Rx ICMP Fragmentation Needed (%d)", mtu);

	/* wind down the local interface MTU */
	if (mtu > 0 && peer->if_mtu == 65535 && mtu < peer->if_mtu) {
		peer->if_mtu = mtu;
		_net("I/F MTU %u", mtu);
	}

	if (mtu == 0) {
		/* they didn't give us a size, estimate one */
		mtu = peer->if_mtu;
		if (mtu > 1500) {
			mtu >>= 1;
			if (mtu < 1500)
				mtu = 1500;
		} else {
			mtu -= 100;
			if (mtu < peer->hdrsize)
				mtu = peer->hdrsize + 4;
		}
	}

	if (mtu < peer->mtu) {
		spin_lock_bh(&peer->lock);
		peer->mtu = mtu;
		peer->maxdata = peer->mtu - peer->hdrsize;
		spin_unlock_bh(&peer->lock);
		_net("Net MTU %u (maxdata %u)",
		     peer->mtu, peer->maxdata);
	}
}

/*
 * Handle an error received on the local endpoint.
 */
void rxrpc_error_report(struct sock *sk)
{
	struct sock_exterr_skb *serr;
	struct sockaddr_rxrpc srx;
	struct rxrpc_local *local = sk->sk_user_data;
	struct rxrpc_peer *peer;
	struct sk_buff *skb;

	_enter("%p{%d}", sk, local->debug_id);

	skb = sock_dequeue_err_skb(sk);
	if (!skb) {
		_leave("UDP socket errqueue empty");
		return;
	}
	rxrpc_new_skb(skb, rxrpc_skb_rx_received);
	serr = SKB_EXT_ERR(skb);
	if (!skb->len && serr->ee.ee_origin == SO_EE_ORIGIN_TIMESTAMPING) {
		_leave("UDP empty message");
		rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
		return;
	}

	rcu_read_lock();
	peer = rxrpc_lookup_peer_icmp_rcu(local, skb, &srx);
	if (peer && !rxrpc_get_peer_maybe(peer))
		peer = NULL;
	if (!peer) {
		rcu_read_unlock();
		rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
		_leave(" [no peer]");
		return;
	}

	trace_rxrpc_rx_icmp(peer, &serr->ee, &srx);

	if ((serr->ee.ee_origin == SO_EE_ORIGIN_ICMP &&
	     serr->ee.ee_type == ICMP_DEST_UNREACH &&
	     serr->ee.ee_code == ICMP_FRAG_NEEDED)) {
		rxrpc_adjust_mtu(peer, serr);
		rcu_read_unlock();
		rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
		rxrpc_put_peer(peer);
		_leave(" [MTU update]");
		return;
	}

	rxrpc_store_error(peer, serr);
	rcu_read_unlock();
	rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
	rxrpc_put_peer(peer);

	_leave("");
}

/*
 * Map an error report to error codes on the peer record.
 */
static void rxrpc_store_error(struct rxrpc_peer *peer,
			      struct sock_exterr_skb *serr)
{
	enum rxrpc_call_completion compl = RXRPC_CALL_NETWORK_ERROR;
	struct sock_extended_err *ee;
	int err;

	_enter("");

	ee = &serr->ee;

	err = ee->ee_errno;

	switch (ee->ee_origin) {
	case SO_EE_ORIGIN_ICMP:
		switch (ee->ee_type) {
		case ICMP_DEST_UNREACH:
			switch (ee->ee_code) {
			case ICMP_NET_UNREACH:
				_net("Rx Received ICMP Network Unreachable");
				break;
			case ICMP_HOST_UNREACH:
				_net("Rx Received ICMP Host Unreachable");
				break;
			case ICMP_PORT_UNREACH:
				_net("Rx Received ICMP Port Unreachable");
				break;
			case ICMP_NET_UNKNOWN:
				_net("Rx Received ICMP Unknown Network");
				break;
			case ICMP_HOST_UNKNOWN:
				_net("Rx Received ICMP Unknown Host");
				break;
			default:
				_net("Rx Received ICMP DestUnreach code=%u",
				     ee->ee_code);
				break;
			}
			break;

		case ICMP_TIME_EXCEEDED:
			_net("Rx Received ICMP TTL Exceeded");
			break;

		default:
			_proto("Rx Received ICMP error { type=%u code=%u }",
			       ee->ee_type, ee->ee_code);
			break;
		}
		break;

	case SO_EE_ORIGIN_NONE:
	case SO_EE_ORIGIN_LOCAL:
		_proto("Rx Received local error { error=%d }", err);
		compl = RXRPC_CALL_LOCAL_ERROR;
		break;

	case SO_EE_ORIGIN_ICMP6:
	default:
		_proto("Rx Received error report { orig=%u }", ee->ee_origin);
		break;
	}

	rxrpc_distribute_error(peer, err, compl);
}

/*
 * Distribute an error that occurred on a peer.
 */
static void rxrpc_distribute_error(struct rxrpc_peer *peer, int error,
				   enum rxrpc_call_completion compl)
{
	struct rxrpc_call *call;

	hlist_for_each_entry_rcu(call, &peer->error_targets, error_link) {
		rxrpc_see_call(call);
		if (call->state < RXRPC_CALL_COMPLETE &&
		    rxrpc_set_call_completion(call, compl, 0, -error))
			rxrpc_notify_socket(call);
	}
}

/*
 * Add RTT information to cache.  This is called in softirq mode and has
 * exclusive access to the peer RTT data.
 */
void rxrpc_peer_add_rtt(struct rxrpc_call *call, enum rxrpc_rtt_rx_trace why,
			rxrpc_serial_t send_serial, rxrpc_serial_t resp_serial,
			ktime_t send_time, ktime_t resp_time)
{
	struct rxrpc_peer *peer = call->peer;
	s64 rtt;
	u64 sum = peer->rtt_sum, avg;
	u8 cursor = peer->rtt_cursor, usage = peer->rtt_usage;

	rtt = ktime_to_ns(ktime_sub(resp_time, send_time));
	if (rtt < 0)
		return;

	spin_lock(&peer->rtt_input_lock);

	/* Replace the oldest datum in the RTT buffer */
	sum -= peer->rtt_cache[cursor];
	sum += rtt;
	peer->rtt_cache[cursor] = rtt;
	peer->rtt_cursor = (cursor + 1) & (RXRPC_RTT_CACHE_SIZE - 1);
	peer->rtt_sum = sum;
	if (usage < RXRPC_RTT_CACHE_SIZE) {
		usage++;
		peer->rtt_usage = usage;
	}

	spin_unlock(&peer->rtt_input_lock);

	/* Now recalculate the average */
	if (usage == RXRPC_RTT_CACHE_SIZE) {
		avg = sum / RXRPC_RTT_CACHE_SIZE;
	} else {
		avg = sum;
		do_div(avg, usage);
	}

	/* Don't need to update this under lock */
	peer->rtt = avg;
	trace_rxrpc_rtt_rx(call, why, send_serial, resp_serial, rtt,
			   usage, avg);
}

/*
 * Perform keep-alive pings.
 */
static void rxrpc_peer_keepalive_dispatch(struct rxrpc_net *rxnet,
					  struct list_head *collector,
					  time64_t base,
					  u8 cursor)
{
	struct rxrpc_peer *peer;
	const u8 mask = ARRAY_SIZE(rxnet->peer_keepalive) - 1;
	time64_t keepalive_at;
	int slot;

	spin_lock_bh(&rxnet->peer_hash_lock);

	while (!list_empty(collector)) {
		peer = list_entry(collector->next,
				  struct rxrpc_peer, keepalive_link);

		list_del_init(&peer->keepalive_link);
		if (!rxrpc_get_peer_maybe(peer))
			continue;

		spin_unlock_bh(&rxnet->peer_hash_lock);

		keepalive_at = peer->last_tx_at + RXRPC_KEEPALIVE_TIME;
		slot = keepalive_at - base;
		_debug("%02x peer %u t=%d {%pISp}",
		       cursor, peer->debug_id, slot, &peer->srx.transport);

		if (keepalive_at <= base ||
		    keepalive_at > base + RXRPC_KEEPALIVE_TIME) {
			rxrpc_send_keepalive(peer);
			slot = RXRPC_KEEPALIVE_TIME;
		}

		/* A transmission to this peer occurred since last we examined
		 * it so put it into the appropriate future bucket.
		 */
		slot += cursor;
		slot &= mask;
		spin_lock_bh(&rxnet->peer_hash_lock);
		list_add_tail(&peer->keepalive_link,
			      &rxnet->peer_keepalive[slot & mask]);
		rxrpc_put_peer(peer);
	}

	spin_unlock_bh(&rxnet->peer_hash_lock);
}

/*
 * Perform keep-alive pings with VERSION packets to keep any NAT alive.
 */
void rxrpc_peer_keepalive_worker(struct work_struct *work)
{
	struct rxrpc_net *rxnet =
		container_of(work, struct rxrpc_net, peer_keepalive_work);
	const u8 mask = ARRAY_SIZE(rxnet->peer_keepalive) - 1;
	time64_t base, now, delay;
	u8 cursor, stop;
	LIST_HEAD(collector);

	now = ktime_get_seconds();
	base = rxnet->peer_keepalive_base;
	cursor = rxnet->peer_keepalive_cursor;
	_enter("%lld,%u", base - now, cursor);

	if (!rxnet->live)
		return;

	/* Remove to a temporary list all the peers that are currently lodged
	 * in expired buckets plus all new peers.
	 *
	 * Everything in the bucket at the cursor is processed this
	 * second; the bucket at cursor + 1 goes at now + 1s and so
	 * on...
	 */
	spin_lock_bh(&rxnet->peer_hash_lock);
	list_splice_init(&rxnet->peer_keepalive_new, &collector);

	stop = cursor + ARRAY_SIZE(rxnet->peer_keepalive);
	while (base <= now && (s8)(cursor - stop) < 0) {
		list_splice_tail_init(&rxnet->peer_keepalive[cursor & mask],
				      &collector);
		base++;
		cursor++;
	}

	base = now;
	spin_unlock_bh(&rxnet->peer_hash_lock);

	rxnet->peer_keepalive_base = base;
	rxnet->peer_keepalive_cursor = cursor;
	rxrpc_peer_keepalive_dispatch(rxnet, &collector, base, cursor);
	ASSERT(list_empty(&collector));

	/* Schedule the timer for the next occupied timeslot. */
	cursor = rxnet->peer_keepalive_cursor;
	stop = cursor + RXRPC_KEEPALIVE_TIME - 1;
	for (; (s8)(cursor - stop) < 0; cursor++) {
		if (!list_empty(&rxnet->peer_keepalive[cursor & mask]))
			break;
		base++;
	}

	now = ktime_get_seconds();
	delay = base - now;
	if (delay < 1)
		delay = 1;
	delay *= HZ;
	if (rxnet->live)
		timer_reduce(&rxnet->peer_keepalive_timer, jiffies + delay);

	_leave("");
}
Commit	Line	Data
f66d7490	1	/* Peer event handling, typically ICMP messages.
17926a79 DH	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
	12	#include <linux/module.h>
	13	#include <linux/net.h>
	14	#include <linux/skbuff.h>
	15	#include <linux/errqueue.h>
	16	#include <linux/udp.h>
	17	#include <linux/in.h>
	18	#include <linux/in6.h>
	19	#include <linux/icmp.h>
	20	#include <net/sock.h>
	21	#include <net/af_rxrpc.h>
	22	#include <net/ip.h>
	23	#include "ar-internal.h"
	24
f66d7490	25	static void rxrpc_store_error(struct rxrpc_peer , struct sock_exterr_skb );
f3344303 DH	26	static void rxrpc_distribute_error(struct rxrpc_peer *, int,
f3344303 DH	27	enum rxrpc_call_completion);
f66d7490	28
be6e6707 DH	29	/*
	30	* Find the peer associated with an ICMP packet.
	31	*/
	32	static struct rxrpc_peer rxrpc_lookup_peer_icmp_rcu(struct rxrpc_local local,
494337c9 DH	33	const struct sk_buff *skb,
494337c9 DH	34	struct sockaddr_rxrpc *srx)
be6e6707 DH	35	{
be6e6707 DH	36	struct sock_exterr_skb *serr = SKB_EXT_ERR(skb);
be6e6707 DH	37
	38	_enter("");
	39
494337c9 DH	40	memset(srx, 0, sizeof(*srx));
	41	srx->transport_type = local->srx.transport_type;
	42	srx->transport_len = local->srx.transport_len;
	43	srx->transport.family = local->srx.transport.family;
be6e6707 DH	44
	45	/* Can we see an ICMP4 packet on an ICMP6 listening socket? and vice
	46	* versa?
	47	*/
494337c9	48	switch (srx->transport.family) {
be6e6707	49	case AF_INET:
46894a13 DH	50	srx->transport_len = sizeof(srx->transport.sin);
46894a13 DH	51	srx->transport.family = AF_INET;
494337c9	52	srx->transport.sin.sin_port = serr->port;
be6e6707 DH	53	switch (serr->ee.ee_origin) {
	54	case SO_EE_ORIGIN_ICMP:
	55	_net("Rx ICMP");
494337c9	56	memcpy(&srx->transport.sin.sin_addr,
be6e6707 DH	57	skb_network_header(skb) + serr->addr_offset,
	58	sizeof(struct in_addr));
	59	break;
	60	case SO_EE_ORIGIN_ICMP6:
	61	_net("Rx ICMP6 on v4 sock");
494337c9	62	memcpy(&srx->transport.sin.sin_addr,
be6e6707 DH	63	skb_network_header(skb) + serr->addr_offset + 12,
	64	sizeof(struct in_addr));
	65	break;
	66	default:
494337c9	67	memcpy(&srx->transport.sin.sin_addr, &ip_hdr(skb)->saddr,
be6e6707 DH	68	sizeof(struct in_addr));
	69	break;
	70	}
	71	break;
	72
d1912747	73	#ifdef CONFIG_AF_RXRPC_IPV6
75b54cb5	74	case AF_INET6:
75b54cb5 DH	75	switch (serr->ee.ee_origin) {
	76	case SO_EE_ORIGIN_ICMP6:
	77	_net("Rx ICMP6");
46894a13	78	srx->transport.sin6.sin6_port = serr->port;
494337c9	79	memcpy(&srx->transport.sin6.sin6_addr,
75b54cb5 DH	80	skb_network_header(skb) + serr->addr_offset,
	81	sizeof(struct in6_addr));
	82	break;
	83	case SO_EE_ORIGIN_ICMP:
	84	_net("Rx ICMP on v6 sock");
46894a13 DH	85	srx->transport_len = sizeof(srx->transport.sin);
	86	srx->transport.family = AF_INET;
	87	srx->transport.sin.sin_port = serr->port;
	88	memcpy(&srx->transport.sin.sin_addr,
75b54cb5 DH	89	skb_network_header(skb) + serr->addr_offset,
	90	sizeof(struct in_addr));
	91	break;
	92	default:
494337c9	93	memcpy(&srx->transport.sin6.sin6_addr,
75b54cb5 DH	94	&ipv6_hdr(skb)->saddr,
	95	sizeof(struct in6_addr));
	96	break;
	97	}
	98	break;
d1912747	99	#endif
75b54cb5	100
be6e6707 DH	101	default:
	102	BUG();
	103	}
	104
494337c9	105	return rxrpc_lookup_peer_rcu(local, srx);
be6e6707 DH	106	}
be6e6707 DH	107
1a70c05b DH	108	/*
	109	* Handle an MTU/fragmentation problem.
	110	*/
	111	static void rxrpc_adjust_mtu(struct rxrpc_peer peer, struct sock_exterr_skb serr)
	112	{
	113	u32 mtu = serr->ee.ee_info;
	114
	115	_net("Rx ICMP Fragmentation Needed (%d)", mtu);
	116
	117	/* wind down the local interface MTU */
	118	if (mtu > 0 && peer->if_mtu == 65535 && mtu < peer->if_mtu) {
	119	peer->if_mtu = mtu;
	120	_net("I/F MTU %u", mtu);
	121	}
	122
	123	if (mtu == 0) {
	124	/* they didn't give us a size, estimate one */
	125	mtu = peer->if_mtu;
	126	if (mtu > 1500) {
	127	mtu >>= 1;
	128	if (mtu < 1500)
	129	mtu = 1500;
	130	} else {
	131	mtu -= 100;
	132	if (mtu < peer->hdrsize)
	133	mtu = peer->hdrsize + 4;
	134	}
	135	}
	136
	137	if (mtu < peer->mtu) {
	138	spin_lock_bh(&peer->lock);
	139	peer->mtu = mtu;
	140	peer->maxdata = peer->mtu - peer->hdrsize;
	141	spin_unlock_bh(&peer->lock);
	142	_net("Net MTU %u (maxdata %u)",
	143	peer->mtu, peer->maxdata);
	144	}
	145	}
	146
17926a79	147	/*
f66d7490	148	* Handle an error received on the local endpoint.
17926a79	149	*/
abe89ef0	150	void rxrpc_error_report(struct sock *sk)
17926a79 DH	151	{
17926a79 DH	152	struct sock_exterr_skb *serr;
494337c9	153	struct sockaddr_rxrpc srx;
17926a79 DH	154	struct rxrpc_local *local = sk->sk_user_data;
	155	struct rxrpc_peer *peer;
	156	struct sk_buff *skb;
17926a79 DH	157
	158	_enter("%p{%d}", sk, local->debug_id);
	159
364a9e93	160	skb = sock_dequeue_err_skb(sk);
17926a79 DH	161	if (!skb) {
	162	_leave("UDP socket errqueue empty");
	163	return;
	164	}
71f3ca40	165	rxrpc_new_skb(skb, rxrpc_skb_rx_received);
c247f053 WB	166	serr = SKB_EXT_ERR(skb);
c247f053 WB	167	if (!skb->len && serr->ee.ee_origin == SO_EE_ORIGIN_TIMESTAMPING) {
49ca0d8b	168	_leave("UDP empty message");
71f3ca40	169	rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
49ca0d8b WB	170	return;
49ca0d8b WB	171	}
17926a79	172
be6e6707	173	rcu_read_lock();
494337c9	174	peer = rxrpc_lookup_peer_icmp_rcu(local, skb, &srx);
be6e6707 DH	175	if (peer && !rxrpc_get_peer_maybe(peer))
	176	peer = NULL;
	177	if (!peer) {
	178	rcu_read_unlock();
71f3ca40	179	rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
17926a79 DH	180	_leave(" [no peer]");
	181	return;
	182	}
	183
494337c9 DH	184	trace_rxrpc_rx_icmp(peer, &serr->ee, &srx);
494337c9 DH	185
1a70c05b DH	186	if ((serr->ee.ee_origin == SO_EE_ORIGIN_ICMP &&
	187	serr->ee.ee_type == ICMP_DEST_UNREACH &&
	188	serr->ee.ee_code == ICMP_FRAG_NEEDED)) {
	189	rxrpc_adjust_mtu(peer, serr);
f66d7490	190	rcu_read_unlock();
71f3ca40	191	rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
f66d7490 DH	192	rxrpc_put_peer(peer);
	193	_leave(" [MTU update]");
	194	return;
17926a79 DH	195	}
17926a79 DH	196
f66d7490	197	rxrpc_store_error(peer, serr);
be6e6707	198	rcu_read_unlock();
71f3ca40	199	rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
1890fea7	200	rxrpc_put_peer(peer);
17926a79	201
17926a79 DH	202	_leave("");
	203	}
	204
	205	/*
f66d7490	206	* Map an error report to error codes on the peer record.
17926a79	207	*/
f66d7490 DH	208	static void rxrpc_store_error(struct rxrpc_peer *peer,
f66d7490 DH	209	struct sock_exterr_skb *serr)
17926a79	210	{
f3344303	211	enum rxrpc_call_completion compl = RXRPC_CALL_NETWORK_ERROR;
17926a79	212	struct sock_extended_err *ee;
c9d10c49	213	int err;
17926a79 DH	214
	215	_enter("");
	216
17926a79 DH	217	ee = &serr->ee;
17926a79 DH	218
17926a79 DH	219	err = ee->ee_errno;
	220
	221	switch (ee->ee_origin) {
	222	case SO_EE_ORIGIN_ICMP:
17926a79 DH	223	switch (ee->ee_type) {
	224	case ICMP_DEST_UNREACH:
	225	switch (ee->ee_code) {
	226	case ICMP_NET_UNREACH:
	227	_net("Rx Received ICMP Network Unreachable");
17926a79 DH	228	break;
	229	case ICMP_HOST_UNREACH:
	230	_net("Rx Received ICMP Host Unreachable");
17926a79 DH	231	break;
	232	case ICMP_PORT_UNREACH:
	233	_net("Rx Received ICMP Port Unreachable");
17926a79 DH	234	break;
	235	case ICMP_NET_UNKNOWN:
	236	_net("Rx Received ICMP Unknown Network");
17926a79 DH	237	break;
	238	case ICMP_HOST_UNKNOWN:
	239	_net("Rx Received ICMP Unknown Host");
17926a79 DH	240	break;
	241	default:
	242	_net("Rx Received ICMP DestUnreach code=%u",
	243	ee->ee_code);
	244	break;
	245	}
	246	break;
	247
	248	case ICMP_TIME_EXCEEDED:
	249	_net("Rx Received ICMP TTL Exceeded");
	250	break;
	251
	252	default:
	253	_proto("Rx Received ICMP error { type=%u code=%u }",
	254	ee->ee_type, ee->ee_code);
	255	break;
	256	}
	257	break;
	258
f66d7490	259	case SO_EE_ORIGIN_NONE:
17926a79	260	case SO_EE_ORIGIN_LOCAL:
fe77d5fc	261	_proto("Rx Received local error { error=%d }", err);
f3344303	262	compl = RXRPC_CALL_LOCAL_ERROR;
17926a79 DH	263	break;
17926a79 DH	264
17926a79 DH	265	case SO_EE_ORIGIN_ICMP6:
17926a79 DH	266	default:
fe77d5fc	267	_proto("Rx Received error report { orig=%u }", ee->ee_origin);
17926a79 DH	268	break;
	269	}
	270
f3344303	271	rxrpc_distribute_error(peer, err, compl);
f66d7490 DH	272	}
	273
	274	/*
f3344303	275	* Distribute an error that occurred on a peer.
f66d7490	276	*/
f3344303 DH	277	static void rxrpc_distribute_error(struct rxrpc_peer *peer, int error,
f3344303 DH	278	enum rxrpc_call_completion compl)
f66d7490	279	{
f66d7490	280	struct rxrpc_call *call;
17926a79	281
f3344303	282	hlist_for_each_entry_rcu(call, &peer->error_targets, error_link) {
e34d4234	283	rxrpc_see_call(call);
f3344303 DH	284	if (call->state < RXRPC_CALL_COMPLETE &&
f3344303 DH	285	rxrpc_set_call_completion(call, compl, 0, -error))
248f219c	286	rxrpc_notify_socket(call);
17926a79	287	}
17926a79	288	}
cf1a6474 DH	289
	290	/*
	291	* Add RTT information to cache. This is called in softirq mode and has
	292	* exclusive access to the peer RTT data.
	293	*/
	294	void rxrpc_peer_add_rtt(struct rxrpc_call *call, enum rxrpc_rtt_rx_trace why,
	295	rxrpc_serial_t send_serial, rxrpc_serial_t resp_serial,
	296	ktime_t send_time, ktime_t resp_time)
	297	{
	298	struct rxrpc_peer *peer = call->peer;
	299	s64 rtt;
	300	u64 sum = peer->rtt_sum, avg;
	301	u8 cursor = peer->rtt_cursor, usage = peer->rtt_usage;
	302
	303	rtt = ktime_to_ns(ktime_sub(resp_time, send_time));
	304	if (rtt < 0)
	305	return;
	306
c1e15b49 DH	307	spin_lock(&peer->rtt_input_lock);
c1e15b49 DH	308
cf1a6474 DH	309	/* Replace the oldest datum in the RTT buffer */
	310	sum -= peer->rtt_cache[cursor];
	311	sum += rtt;
	312	peer->rtt_cache[cursor] = rtt;
	313	peer->rtt_cursor = (cursor + 1) & (RXRPC_RTT_CACHE_SIZE - 1);
	314	peer->rtt_sum = sum;
	315	if (usage < RXRPC_RTT_CACHE_SIZE) {
	316	usage++;
	317	peer->rtt_usage = usage;
	318	}
	319
c1e15b49 DH	320	spin_unlock(&peer->rtt_input_lock);
c1e15b49 DH	321
cf1a6474 DH	322	/* Now recalculate the average */
	323	if (usage == RXRPC_RTT_CACHE_SIZE) {
	324	avg = sum / RXRPC_RTT_CACHE_SIZE;
	325	} else {
	326	avg = sum;
	327	do_div(avg, usage);
	328	}
	329
c1e15b49	330	/* Don't need to update this under lock */
cf1a6474 DH	331	peer->rtt = avg;
	332	trace_rxrpc_rtt_rx(call, why, send_serial, resp_serial, rtt,
	333	usage, avg);
	334	}
ace45bec DH	335
ace45bec DH	336	/*
330bdcfa	337	* Perform keep-alive pings.
ace45bec	338	*/
330bdcfa DH	339	static void rxrpc_peer_keepalive_dispatch(struct rxrpc_net *rxnet,
	340	struct list_head *collector,
	341	time64_t base,
	342	u8 cursor)
ace45bec	343	{
ace45bec	344	struct rxrpc_peer *peer;
330bdcfa DH	345	const u8 mask = ARRAY_SIZE(rxnet->peer_keepalive) - 1;
	346	time64_t keepalive_at;
	347	int slot;
ace45bec	348
330bdcfa	349	spin_lock_bh(&rxnet->peer_hash_lock);
ace45bec	350
330bdcfa DH	351	while (!list_empty(collector)) {
	352	peer = list_entry(collector->next,
	353	struct rxrpc_peer, keepalive_link);
ace45bec	354
330bdcfa DH	355	list_del_init(&peer->keepalive_link);
	356	if (!rxrpc_get_peer_maybe(peer))
	357	continue;
ace45bec	358
ace45bec	359	spin_unlock_bh(&rxnet->peer_hash_lock);
ace45bec	360
330bdcfa DH	361	keepalive_at = peer->last_tx_at + RXRPC_KEEPALIVE_TIME;
	362	slot = keepalive_at - base;
	363	_debug("%02x peer %u t=%d {%pISp}",
	364	cursor, peer->debug_id, slot, &peer->srx.transport);
	365
	366	if (keepalive_at <= base \|\|
	367	keepalive_at > base + RXRPC_KEEPALIVE_TIME) {
	368	rxrpc_send_keepalive(peer);
	369	slot = RXRPC_KEEPALIVE_TIME;
ace45bec DH	370	}
ace45bec DH	371
330bdcfa DH	372	/* A transmission to this peer occurred since last we examined
	373	* it so put it into the appropriate future bucket.
	374	*/
	375	slot += cursor;
	376	slot &= mask;
	377	spin_lock_bh(&rxnet->peer_hash_lock);
	378	list_add_tail(&peer->keepalive_link,
	379	&rxnet->peer_keepalive[slot & mask]);
	380	rxrpc_put_peer(peer);
ace45bec DH	381	}
ace45bec DH	382
ace45bec	383	spin_unlock_bh(&rxnet->peer_hash_lock);
330bdcfa	384	}
ace45bec	385
330bdcfa DH	386	/*
	387	* Perform keep-alive pings with VERSION packets to keep any NAT alive.
	388	*/
	389	void rxrpc_peer_keepalive_worker(struct work_struct *work)
	390	{
	391	struct rxrpc_net *rxnet =
	392	container_of(work, struct rxrpc_net, peer_keepalive_work);
	393	const u8 mask = ARRAY_SIZE(rxnet->peer_keepalive) - 1;
	394	time64_t base, now, delay;
	395	u8 cursor, stop;
	396	LIST_HEAD(collector);
ace45bec	397
330bdcfa DH	398	now = ktime_get_seconds();
	399	base = rxnet->peer_keepalive_base;
	400	cursor = rxnet->peer_keepalive_cursor;
	401	_enter("%lld,%u", base - now, cursor);
ace45bec	402
330bdcfa DH	403	if (!rxnet->live)
330bdcfa DH	404	return;
ace45bec	405
330bdcfa DH	406	/* Remove to a temporary list all the peers that are currently lodged
	407	* in expired buckets plus all new peers.
	408	*
	409	* Everything in the bucket at the cursor is processed this
	410	* second; the bucket at cursor + 1 goes at now + 1s and so
	411	* on...
ace45bec	412	*/
ace45bec	413	spin_lock_bh(&rxnet->peer_hash_lock);
330bdcfa DH	414	list_splice_init(&rxnet->peer_keepalive_new, &collector);
	415
	416	stop = cursor + ARRAY_SIZE(rxnet->peer_keepalive);
	417	while (base <= now && (s8)(cursor - stop) < 0) {
	418	list_splice_tail_init(&rxnet->peer_keepalive[cursor & mask],
	419	&collector);
	420	base++;
	421	cursor++;
	422	}
ace45bec	423
330bdcfa DH	424	base = now;
330bdcfa DH	425	spin_unlock_bh(&rxnet->peer_hash_lock);
ace45bec	426
ace45bec DH	427	rxnet->peer_keepalive_base = base;
ace45bec DH	428	rxnet->peer_keepalive_cursor = cursor;
330bdcfa DH	429	rxrpc_peer_keepalive_dispatch(rxnet, &collector, base, cursor);
	430	ASSERT(list_empty(&collector));
	431
	432	/* Schedule the timer for the next occupied timeslot. */
	433	cursor = rxnet->peer_keepalive_cursor;
	434	stop = cursor + RXRPC_KEEPALIVE_TIME - 1;
	435	for (; (s8)(cursor - stop) < 0; cursor++) {
	436	if (!list_empty(&rxnet->peer_keepalive[cursor & mask]))
	437	break;
	438	base++;
	439	}
	440
	441	now = ktime_get_seconds();
	442	delay = base - now;
	443	if (delay < 1)
	444	delay = 1;
	445	delay *= HZ;
	446	if (rxnet->live)
	447	timer_reduce(&rxnet->peer_keepalive_timer, jiffies + delay);
	448
ace45bec DH	449	_leave("");
ace45bec DH	450	}