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linux/net/rxrpc/transport.c

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/* transport.c: Rx Transport routines
*
* Copyright (C) 2002 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/sched.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <rxrpc/transport.h>
#include <rxrpc/peer.h>
#include <rxrpc/connection.h>
#include <rxrpc/call.h>
#include <rxrpc/message.h>
#include <rxrpc/krxiod.h>
#include <rxrpc/krxsecd.h>
#include <linux/udp.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/icmp.h>
#include <net/sock.h>
#include <net/ip.h>
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
#include <linux/ipv6.h> /* this should _really_ be in errqueue.h.. */
#endif
#include <linux/errqueue.h>
#include <asm/uaccess.h>
#include <asm/checksum.h>
#include "internal.h"
struct errormsg {
struct cmsghdr cmsg; /* control message header */
struct sock_extended_err ee; /* extended error information */
struct sockaddr_in icmp_src; /* ICMP packet source address */
};
static DEFINE_SPINLOCK(rxrpc_transports_lock);
static struct list_head rxrpc_transports = LIST_HEAD_INIT(rxrpc_transports);
__RXACCT_DECL(atomic_t rxrpc_transport_count);
LIST_HEAD(rxrpc_proc_transports);
DECLARE_RWSEM(rxrpc_proc_transports_sem);
static void rxrpc_data_ready(struct sock *sk, int count);
static void rxrpc_error_report(struct sock *sk);
static int rxrpc_trans_receive_new_call(struct rxrpc_transport *trans,
struct list_head *msgq);
static void rxrpc_trans_receive_error_report(struct rxrpc_transport *trans);
/*****************************************************************************/
/*
* create a new transport endpoint using the specified UDP port
*/
int rxrpc_create_transport(unsigned short port,
struct rxrpc_transport **_trans)
{
struct rxrpc_transport *trans;
struct sockaddr_in sin;
mm_segment_t oldfs;
struct sock *sock;
int ret, opt;
_enter("%hu", port);
trans = kmalloc(sizeof(struct rxrpc_transport), GFP_KERNEL);
if (!trans)
return -ENOMEM;
memset(trans, 0, sizeof(struct rxrpc_transport));
atomic_set(&trans->usage, 1);
INIT_LIST_HEAD(&trans->services);
INIT_LIST_HEAD(&trans->link);
INIT_LIST_HEAD(&trans->krxiodq_link);
spin_lock_init(&trans->lock);
INIT_LIST_HEAD(&trans->peer_active);
INIT_LIST_HEAD(&trans->peer_graveyard);
spin_lock_init(&trans->peer_gylock);
init_waitqueue_head(&trans->peer_gy_waitq);
rwlock_init(&trans->peer_lock);
atomic_set(&trans->peer_count, 0);
trans->port = port;
/* create a UDP socket to be my actual transport endpoint */
ret = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &trans->socket);
if (ret < 0)
goto error;
/* use the specified port */
if (port) {
memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_port = htons(port);
ret = trans->socket->ops->bind(trans->socket,
(struct sockaddr *) &sin,
sizeof(sin));
if (ret < 0)
goto error;
}
opt = 1;
oldfs = get_fs();
set_fs(KERNEL_DS);
ret = trans->socket->ops->setsockopt(trans->socket, SOL_IP, IP_RECVERR,
(char *) &opt, sizeof(opt));
set_fs(oldfs);
spin_lock(&rxrpc_transports_lock);
list_add(&trans->link, &rxrpc_transports);
spin_unlock(&rxrpc_transports_lock);
/* set the socket up */
sock = trans->socket->sk;
sock->sk_user_data = trans;
sock->sk_data_ready = rxrpc_data_ready;
sock->sk_error_report = rxrpc_error_report;
down_write(&rxrpc_proc_transports_sem);
list_add_tail(&trans->proc_link, &rxrpc_proc_transports);
up_write(&rxrpc_proc_transports_sem);
__RXACCT(atomic_inc(&rxrpc_transport_count));
*_trans = trans;
_leave(" = 0 (%p)", trans);
return 0;
error:
/* finish cleaning up the transport (not really needed here, but...) */
if (trans->socket)
trans->socket->ops->shutdown(trans->socket, 2);
/* close the socket */
if (trans->socket) {
trans->socket->sk->sk_user_data = NULL;
sock_release(trans->socket);
trans->socket = NULL;
}
kfree(trans);
_leave(" = %d", ret);
return ret;
} /* end rxrpc_create_transport() */
/*****************************************************************************/
/*
* destroy a transport endpoint
*/
void rxrpc_put_transport(struct rxrpc_transport *trans)
{
_enter("%p{u=%d p=%hu}",
trans, atomic_read(&trans->usage), trans->port);
BUG_ON(atomic_read(&trans->usage) <= 0);
/* to prevent a race, the decrement and the dequeue must be
* effectively atomic */
spin_lock(&rxrpc_transports_lock);
if (likely(!atomic_dec_and_test(&trans->usage))) {
spin_unlock(&rxrpc_transports_lock);
_leave("");
return;
}
list_del(&trans->link);
spin_unlock(&rxrpc_transports_lock);
/* finish cleaning up the transport */
if (trans->socket)
trans->socket->ops->shutdown(trans->socket, 2);
rxrpc_krxsecd_clear_transport(trans);
rxrpc_krxiod_dequeue_transport(trans);
/* discard all peer information */
rxrpc_peer_clearall(trans);
down_write(&rxrpc_proc_transports_sem);
list_del(&trans->proc_link);
up_write(&rxrpc_proc_transports_sem);
__RXACCT(atomic_dec(&rxrpc_transport_count));
/* close the socket */
if (trans->socket) {
trans->socket->sk->sk_user_data = NULL;
sock_release(trans->socket);
trans->socket = NULL;
}
kfree(trans);
_leave("");
} /* end rxrpc_put_transport() */
/*****************************************************************************/
/*
* add a service to a transport to be listened upon
*/
int rxrpc_add_service(struct rxrpc_transport *trans,
struct rxrpc_service *newsrv)
{
struct rxrpc_service *srv;
struct list_head *_p;
int ret = -EEXIST;
_enter("%p{%hu},%p{%hu}",
trans, trans->port, newsrv, newsrv->service_id);
/* verify that the service ID is not already present */
spin_lock(&trans->lock);
list_for_each(_p, &trans->services) {
srv = list_entry(_p, struct rxrpc_service, link);
if (srv->service_id == newsrv->service_id)
goto out;
}
/* okay - add the transport to the list */
list_add_tail(&newsrv->link, &trans->services);
rxrpc_get_transport(trans);
ret = 0;
out:
spin_unlock(&trans->lock);
_leave("= %d", ret);
return ret;
} /* end rxrpc_add_service() */
/*****************************************************************************/
/*
* remove a service from a transport
*/
void rxrpc_del_service(struct rxrpc_transport *trans, struct rxrpc_service *srv)
{
_enter("%p{%hu},%p{%hu}", trans, trans->port, srv, srv->service_id);
spin_lock(&trans->lock);
list_del(&srv->link);
spin_unlock(&trans->lock);
rxrpc_put_transport(trans);
_leave("");
} /* end rxrpc_del_service() */
/*****************************************************************************/
/*
* INET callback when data has been received on the socket.
*/
static void rxrpc_data_ready(struct sock *sk, int count)
{
struct rxrpc_transport *trans;
_enter("%p{t=%p},%d", sk, sk->sk_user_data, count);
/* queue the transport for attention by krxiod */
trans = (struct rxrpc_transport *) sk->sk_user_data;
if (trans)
rxrpc_krxiod_queue_transport(trans);
/* wake up anyone waiting on the socket */
if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
wake_up_interruptible(sk->sk_sleep);
_leave("");
} /* end rxrpc_data_ready() */
/*****************************************************************************/
/*
* INET callback when an ICMP error packet is received
* - sk->err is error (EHOSTUNREACH, EPROTO or EMSGSIZE)
*/
static void rxrpc_error_report(struct sock *sk)
{
struct rxrpc_transport *trans;
_enter("%p{t=%p}", sk, sk->sk_user_data);
/* queue the transport for attention by krxiod */
trans = (struct rxrpc_transport *) sk->sk_user_data;
if (trans) {
trans->error_rcvd = 1;
rxrpc_krxiod_queue_transport(trans);
}
/* wake up anyone waiting on the socket */
if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
wake_up_interruptible(sk->sk_sleep);
_leave("");
} /* end rxrpc_error_report() */
/*****************************************************************************/
/*
* split a message up, allocating message records and filling them in
* from the contents of a socket buffer
*/
static int rxrpc_incoming_msg(struct rxrpc_transport *trans,
struct sk_buff *pkt,
struct list_head *msgq)
{
struct rxrpc_message *msg;
int ret;
_enter("");
msg = kmalloc(sizeof(struct rxrpc_message), GFP_KERNEL);
if (!msg) {
_leave(" = -ENOMEM");
return -ENOMEM;
}
memset(msg, 0, sizeof(*msg));
atomic_set(&msg->usage, 1);
list_add_tail(&msg->link,msgq);
/* dig out the Rx routing parameters */
if (skb_copy_bits(pkt, sizeof(struct udphdr),
&msg->hdr, sizeof(msg->hdr)) < 0) {
ret = -EBADMSG;
goto error;
}
msg->trans = trans;
msg->state = RXRPC_MSG_RECEIVED;
skb_get_timestamp(pkt, &msg->stamp);
if (msg->stamp.tv_sec == 0) {
do_gettimeofday(&msg->stamp);
if (pkt->sk)
sock_enable_timestamp(pkt->sk);
}
msg->seq = ntohl(msg->hdr.seq);
/* attach the packet */
skb_get(pkt);
msg->pkt = pkt;
msg->offset = sizeof(struct udphdr) + sizeof(struct rxrpc_header);
msg->dsize = msg->pkt->len - msg->offset;
_net("Rx Received packet from %s (%08x;%08x,%1x,%d,%s,%02x,%d,%d)",
msg->hdr.flags & RXRPC_CLIENT_INITIATED ? "client" : "server",
ntohl(msg->hdr.epoch),
(ntohl(msg->hdr.cid) & RXRPC_CIDMASK) >> RXRPC_CIDSHIFT,
ntohl(msg->hdr.cid) & RXRPC_CHANNELMASK,
ntohl(msg->hdr.callNumber),
rxrpc_pkts[msg->hdr.type],
msg->hdr.flags,
ntohs(msg->hdr.serviceId),
msg->hdr.securityIndex);
__RXACCT(atomic_inc(&rxrpc_message_count));
/* split off jumbo packets */
while (msg->hdr.type == RXRPC_PACKET_TYPE_DATA &&
msg->hdr.flags & RXRPC_JUMBO_PACKET
) {
struct rxrpc_jumbo_header jumbo;
struct rxrpc_message *jumbomsg = msg;
_debug("split jumbo packet");
/* quick sanity check */
ret = -EBADMSG;
if (msg->dsize <
RXRPC_JUMBO_DATALEN + sizeof(struct rxrpc_jumbo_header))
goto error;
if (msg->hdr.flags & RXRPC_LAST_PACKET)
goto error;
/* dig out the secondary header */
if (skb_copy_bits(pkt, msg->offset + RXRPC_JUMBO_DATALEN,
&jumbo, sizeof(jumbo)) < 0)
goto error;
/* allocate a new message record */
ret = -ENOMEM;
msg = kmalloc(sizeof(struct rxrpc_message), GFP_KERNEL);
if (!msg)
goto error;
memcpy(msg, jumbomsg, sizeof(*msg));
list_add_tail(&msg->link, msgq);
/* adjust the jumbo packet */
jumbomsg->dsize = RXRPC_JUMBO_DATALEN;
/* attach the packet here too */
skb_get(pkt);
/* adjust the parameters */
msg->seq++;
msg->hdr.seq = htonl(msg->seq);
msg->hdr.serial = htonl(ntohl(msg->hdr.serial) + 1);
msg->offset += RXRPC_JUMBO_DATALEN +
sizeof(struct rxrpc_jumbo_header);
msg->dsize -= RXRPC_JUMBO_DATALEN +
sizeof(struct rxrpc_jumbo_header);
msg->hdr.flags = jumbo.flags;
msg->hdr._rsvd = jumbo._rsvd;
_net("Rx Split jumbo packet from %s"
" (%08x;%08x,%1x,%d,%s,%02x,%d,%d)",
msg->hdr.flags & RXRPC_CLIENT_INITIATED ? "client" : "server",
ntohl(msg->hdr.epoch),
(ntohl(msg->hdr.cid) & RXRPC_CIDMASK) >> RXRPC_CIDSHIFT,
ntohl(msg->hdr.cid) & RXRPC_CHANNELMASK,
ntohl(msg->hdr.callNumber),
rxrpc_pkts[msg->hdr.type],
msg->hdr.flags,
ntohs(msg->hdr.serviceId),
msg->hdr.securityIndex);
__RXACCT(atomic_inc(&rxrpc_message_count));
}
_leave(" = 0 #%d", atomic_read(&rxrpc_message_count));
return 0;
error:
while (!list_empty(msgq)) {
msg = list_entry(msgq->next, struct rxrpc_message, link);
list_del_init(&msg->link);
rxrpc_put_message(msg);
}
_leave(" = %d", ret);
return ret;
} /* end rxrpc_incoming_msg() */
/*****************************************************************************/
/*
* accept a new call
* - called from krxiod in process context
*/
void rxrpc_trans_receive_packet(struct rxrpc_transport *trans)
{
struct rxrpc_message *msg;
struct rxrpc_peer *peer;
struct sk_buff *pkt;
int ret;
__be32 addr;
__be16 port;
LIST_HEAD(msgq);
_enter("%p{%d}", trans, trans->port);
for (;;) {
/* deal with outstanting errors first */
if (trans->error_rcvd)
rxrpc_trans_receive_error_report(trans);
/* attempt to receive a packet */
pkt = skb_recv_datagram(trans->socket->sk, 0, 1, &ret);
if (!pkt) {
if (ret == -EAGAIN) {
_leave(" EAGAIN");
return;
}
/* an icmp error may have occurred */
rxrpc_krxiod_queue_transport(trans);
_leave(" error %d\n", ret);
return;
}
/* we'll probably need to checksum it (didn't call
* sock_recvmsg) */
if (pkt->ip_summed != CHECKSUM_UNNECESSARY) {
if ((unsigned short)
csum_fold(skb_checksum(pkt, 0, pkt->len,
pkt->csum))) {
kfree_skb(pkt);
rxrpc_krxiod_queue_transport(trans);
_leave(" CSUM failed");
return;
}
}
addr = pkt->nh.iph->saddr;
port = pkt->h.uh->source;
_net("Rx Received UDP packet from %08x:%04hu",
ntohl(addr), ntohs(port));
/* unmarshall the Rx parameters and split jumbo packets */
ret = rxrpc_incoming_msg(trans, pkt, &msgq);
if (ret < 0) {
kfree_skb(pkt);
rxrpc_krxiod_queue_transport(trans);
_leave(" bad packet");
return;
}
BUG_ON(list_empty(&msgq));
msg = list_entry(msgq.next, struct rxrpc_message, link);
/* locate the record for the peer from which it
* originated */
ret = rxrpc_peer_lookup(trans, addr, &peer);
if (ret < 0) {
kdebug("Rx No connections from that peer");
rxrpc_trans_immediate_abort(trans, msg, -EINVAL);
goto finished_msg;
}
/* try and find a matching connection */
ret = rxrpc_connection_lookup(peer, msg, &msg->conn);
if (ret < 0) {
kdebug("Rx Unknown Connection");
rxrpc_trans_immediate_abort(trans, msg, -EINVAL);
rxrpc_put_peer(peer);
goto finished_msg;
}
rxrpc_put_peer(peer);
/* deal with the first packet of a new call */
if (msg->hdr.flags & RXRPC_CLIENT_INITIATED &&
msg->hdr.type == RXRPC_PACKET_TYPE_DATA &&
ntohl(msg->hdr.seq) == 1
) {
_debug("Rx New server call");
rxrpc_trans_receive_new_call(trans, &msgq);
goto finished_msg;
}
/* deal with subsequent packet(s) of call */
_debug("Rx Call packet");
while (!list_empty(&msgq)) {
msg = list_entry(msgq.next, struct rxrpc_message, link);
list_del_init(&msg->link);
ret = rxrpc_conn_receive_call_packet(msg->conn, NULL, msg);
if (ret < 0) {
rxrpc_trans_immediate_abort(trans, msg, ret);
rxrpc_put_message(msg);
goto finished_msg;
}
rxrpc_put_message(msg);
}
goto finished_msg;
/* dispose of the packets */
finished_msg:
while (!list_empty(&msgq)) {
msg = list_entry(msgq.next, struct rxrpc_message, link);
list_del_init(&msg->link);
rxrpc_put_message(msg);
}
kfree_skb(pkt);
}
_leave("");
} /* end rxrpc_trans_receive_packet() */
/*****************************************************************************/
/*
* accept a new call from a client trying to connect to one of my services
* - called in process context
*/
static int rxrpc_trans_receive_new_call(struct rxrpc_transport *trans,
struct list_head *msgq)
{
struct rxrpc_message *msg;
_enter("");
/* only bother with the first packet */
msg = list_entry(msgq->next, struct rxrpc_message, link);
list_del_init(&msg->link);
rxrpc_krxsecd_queue_incoming_call(msg);
rxrpc_put_message(msg);
_leave(" = 0");
return 0;
} /* end rxrpc_trans_receive_new_call() */
/*****************************************************************************/
/*
* perform an immediate abort without connection or call structures
*/
int rxrpc_trans_immediate_abort(struct rxrpc_transport *trans,
struct rxrpc_message *msg,
int error)
{
struct rxrpc_header ahdr;
struct sockaddr_in sin;
struct msghdr msghdr;
struct kvec iov[2];
__be32 _error;
int len, ret;
_enter("%p,%p,%d", trans, msg, error);
/* don't abort an abort packet */
if (msg->hdr.type == RXRPC_PACKET_TYPE_ABORT) {
_leave(" = 0");
return 0;
}
_error = htonl(-error);
/* set up the message to be transmitted */
memcpy(&ahdr, &msg->hdr, sizeof(ahdr));
ahdr.epoch = msg->hdr.epoch;
ahdr.serial = htonl(1);
ahdr.seq = 0;
ahdr.type = RXRPC_PACKET_TYPE_ABORT;
ahdr.flags = RXRPC_LAST_PACKET;
ahdr.flags |= ~msg->hdr.flags & RXRPC_CLIENT_INITIATED;
iov[0].iov_len = sizeof(ahdr);
iov[0].iov_base = &ahdr;
iov[1].iov_len = sizeof(_error);
iov[1].iov_base = &_error;
len = sizeof(ahdr) + sizeof(_error);
memset(&sin,0,sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_port = msg->pkt->h.uh->source;
sin.sin_addr.s_addr = msg->pkt->nh.iph->saddr;
msghdr.msg_name = &sin;
msghdr.msg_namelen = sizeof(sin);
msghdr.msg_control = NULL;
msghdr.msg_controllen = 0;
msghdr.msg_flags = MSG_DONTWAIT;
_net("Sending message type %d of %d bytes to %08x:%d",
ahdr.type,
len,
ntohl(sin.sin_addr.s_addr),
ntohs(sin.sin_port));
/* send the message */
ret = kernel_sendmsg(trans->socket, &msghdr, iov, 2, len);
_leave(" = %d", ret);
return ret;
} /* end rxrpc_trans_immediate_abort() */
/*****************************************************************************/
/*
* receive an ICMP error report and percolate it to all connections
* heading to the affected host or port
*/
static void rxrpc_trans_receive_error_report(struct rxrpc_transport *trans)
{
struct rxrpc_connection *conn;
struct sockaddr_in sin;
struct rxrpc_peer *peer;
struct list_head connq, *_p;
struct errormsg emsg;
struct msghdr msg;
__be16 port;
int local, err;
_enter("%p", trans);
for (;;) {
trans->error_rcvd = 0;
/* try and receive an error message */
msg.msg_name = &sin;
msg.msg_namelen = sizeof(sin);
msg.msg_control = &emsg;
msg.msg_controllen = sizeof(emsg);
msg.msg_flags = 0;
err = kernel_recvmsg(trans->socket, &msg, NULL, 0, 0,
MSG_ERRQUEUE | MSG_DONTWAIT | MSG_TRUNC);
if (err == -EAGAIN) {
_leave("");
return;
}
if (err < 0) {
printk("%s: unable to recv an error report: %d\n",
__FUNCTION__, err);
_leave("");
return;
}
msg.msg_controllen = (char *) msg.msg_control - (char *) &emsg;
if (msg.msg_controllen < sizeof(emsg.cmsg) ||
msg.msg_namelen < sizeof(sin)) {
printk("%s: short control message"
" (nlen=%u clen=%Zu fl=%x)\n",
__FUNCTION__,
msg.msg_namelen,
msg.msg_controllen,
msg.msg_flags);
continue;
}
_net("Rx Received control message"
" { len=%Zu level=%u type=%u }",
emsg.cmsg.cmsg_len,
emsg.cmsg.cmsg_level,
emsg.cmsg.cmsg_type);
if (sin.sin_family != AF_INET) {
printk("Rx Ignoring error report with non-INET address"
" (fam=%u)",
sin.sin_family);
continue;
}
_net("Rx Received message pertaining to host addr=%x port=%hu",
ntohl(sin.sin_addr.s_addr), ntohs(sin.sin_port));
if (emsg.cmsg.cmsg_level != SOL_IP ||
emsg.cmsg.cmsg_type != IP_RECVERR) {
printk("Rx Ignoring unknown error report"
" { level=%u type=%u }",
emsg.cmsg.cmsg_level,
emsg.cmsg.cmsg_type);
continue;
}
if (msg.msg_controllen < sizeof(emsg.cmsg) + sizeof(emsg.ee)) {
printk("%s: short error message (%Zu)\n",
__FUNCTION__, msg.msg_controllen);
_leave("");
return;
}
port = sin.sin_port;
switch (emsg.ee.ee_origin) {
case SO_EE_ORIGIN_ICMP:
local = 0;
switch (emsg.ee.ee_type) {
case ICMP_DEST_UNREACH:
switch (emsg.ee.ee_code) {
case ICMP_NET_UNREACH:
_net("Rx Received ICMP Network Unreachable");
port = 0;
err = -ENETUNREACH;
break;
case ICMP_HOST_UNREACH:
_net("Rx Received ICMP Host Unreachable");
port = 0;
err = -EHOSTUNREACH;
break;
case ICMP_PORT_UNREACH:
_net("Rx Received ICMP Port Unreachable");
err = -ECONNREFUSED;
break;
case ICMP_NET_UNKNOWN:
_net("Rx Received ICMP Unknown Network");
port = 0;
err = -ENETUNREACH;
break;
case ICMP_HOST_UNKNOWN:
_net("Rx Received ICMP Unknown Host");
port = 0;
err = -EHOSTUNREACH;
break;
default:
_net("Rx Received ICMP DestUnreach { code=%u }",
emsg.ee.ee_code);
err = emsg.ee.ee_errno;
break;
}
break;
case ICMP_TIME_EXCEEDED:
_net("Rx Received ICMP TTL Exceeded");
err = emsg.ee.ee_errno;
break;
default:
_proto("Rx Received ICMP error { type=%u code=%u }",
emsg.ee.ee_type, emsg.ee.ee_code);
err = emsg.ee.ee_errno;
break;
}
break;
case SO_EE_ORIGIN_LOCAL:
_proto("Rx Received local error { error=%d }",
emsg.ee.ee_errno);
local = 1;
err = emsg.ee.ee_errno;
break;
case SO_EE_ORIGIN_NONE:
case SO_EE_ORIGIN_ICMP6:
default:
_proto("Rx Received error report { orig=%u }",
emsg.ee.ee_origin);
local = 0;
err = emsg.ee.ee_errno;
break;
}
/* find all the connections between this transport and the
* affected destination */
INIT_LIST_HEAD(&connq);
if (rxrpc_peer_lookup(trans, sin.sin_addr.s_addr,
&peer) == 0) {
read_lock(&peer->conn_lock);
list_for_each(_p, &peer->conn_active) {
conn = list_entry(_p, struct rxrpc_connection,
link);
if (port && conn->addr.sin_port != port)
continue;
if (!list_empty(&conn->err_link))
continue;
rxrpc_get_connection(conn);
list_add_tail(&conn->err_link, &connq);
}
read_unlock(&peer->conn_lock);
/* service all those connections */
while (!list_empty(&connq)) {
conn = list_entry(connq.next,
struct rxrpc_connection,
err_link);
list_del(&conn->err_link);
rxrpc_conn_handle_error(conn, local, err);
rxrpc_put_connection(conn);
}
rxrpc_put_peer(peer);
}
}
_leave("");
return;
} /* end rxrpc_trans_receive_error_report() */
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