You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
779 lines
20 KiB
779 lines
20 KiB
/* connection.c: Rx connection 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/rxrpc.h>
|
|
#include <rxrpc/transport.h>
|
|
#include <rxrpc/peer.h>
|
|
#include <rxrpc/connection.h>
|
|
#include <rxrpc/call.h>
|
|
#include <rxrpc/message.h>
|
|
#include <linux/udp.h>
|
|
#include <linux/ip.h>
|
|
#include <net/sock.h>
|
|
#include <asm/uaccess.h>
|
|
#include "internal.h"
|
|
|
|
__RXACCT_DECL(atomic_t rxrpc_connection_count);
|
|
|
|
LIST_HEAD(rxrpc_conns);
|
|
DECLARE_RWSEM(rxrpc_conns_sem);
|
|
unsigned long rxrpc_conn_timeout = 60 * 60;
|
|
|
|
static void rxrpc_conn_do_timeout(struct rxrpc_connection *conn);
|
|
|
|
static void __rxrpc_conn_timeout(rxrpc_timer_t *timer)
|
|
{
|
|
struct rxrpc_connection *conn =
|
|
list_entry(timer, struct rxrpc_connection, timeout);
|
|
|
|
_debug("Rx CONN TIMEOUT [%p{u=%d}]", conn, atomic_read(&conn->usage));
|
|
|
|
rxrpc_conn_do_timeout(conn);
|
|
}
|
|
|
|
static const struct rxrpc_timer_ops rxrpc_conn_timer_ops = {
|
|
.timed_out = __rxrpc_conn_timeout,
|
|
};
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* create a new connection record
|
|
*/
|
|
static inline int __rxrpc_create_connection(struct rxrpc_peer *peer,
|
|
struct rxrpc_connection **_conn)
|
|
{
|
|
struct rxrpc_connection *conn;
|
|
|
|
_enter("%p",peer);
|
|
|
|
/* allocate and initialise a connection record */
|
|
conn = kmalloc(sizeof(struct rxrpc_connection), GFP_KERNEL);
|
|
if (!conn) {
|
|
_leave(" = -ENOMEM");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
memset(conn, 0, sizeof(struct rxrpc_connection));
|
|
atomic_set(&conn->usage, 1);
|
|
|
|
INIT_LIST_HEAD(&conn->link);
|
|
INIT_LIST_HEAD(&conn->id_link);
|
|
init_waitqueue_head(&conn->chanwait);
|
|
spin_lock_init(&conn->lock);
|
|
rxrpc_timer_init(&conn->timeout, &rxrpc_conn_timer_ops);
|
|
|
|
do_gettimeofday(&conn->atime);
|
|
conn->mtu_size = 1024;
|
|
conn->peer = peer;
|
|
conn->trans = peer->trans;
|
|
|
|
__RXACCT(atomic_inc(&rxrpc_connection_count));
|
|
*_conn = conn;
|
|
_leave(" = 0 (%p)", conn);
|
|
|
|
return 0;
|
|
} /* end __rxrpc_create_connection() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* create a new connection record for outgoing connections
|
|
*/
|
|
int rxrpc_create_connection(struct rxrpc_transport *trans,
|
|
__be16 port,
|
|
__be32 addr,
|
|
uint16_t service_id,
|
|
void *security,
|
|
struct rxrpc_connection **_conn)
|
|
{
|
|
struct rxrpc_connection *candidate, *conn;
|
|
struct rxrpc_peer *peer;
|
|
struct list_head *_p;
|
|
__be32 connid;
|
|
int ret;
|
|
|
|
_enter("%p{%hu},%u,%hu", trans, trans->port, ntohs(port), service_id);
|
|
|
|
/* get a peer record */
|
|
ret = rxrpc_peer_lookup(trans, addr, &peer);
|
|
if (ret < 0) {
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/* allocate and initialise a connection record */
|
|
ret = __rxrpc_create_connection(peer, &candidate);
|
|
if (ret < 0) {
|
|
rxrpc_put_peer(peer);
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/* fill in the specific bits */
|
|
candidate->addr.sin_family = AF_INET;
|
|
candidate->addr.sin_port = port;
|
|
candidate->addr.sin_addr.s_addr = addr;
|
|
|
|
candidate->in_epoch = rxrpc_epoch;
|
|
candidate->out_epoch = rxrpc_epoch;
|
|
candidate->in_clientflag = 0;
|
|
candidate->out_clientflag = RXRPC_CLIENT_INITIATED;
|
|
candidate->service_id = htons(service_id);
|
|
|
|
/* invent a unique connection ID */
|
|
write_lock(&peer->conn_idlock);
|
|
|
|
try_next_id:
|
|
connid = htonl(peer->conn_idcounter & RXRPC_CIDMASK);
|
|
peer->conn_idcounter += RXRPC_MAXCALLS;
|
|
|
|
list_for_each(_p, &peer->conn_idlist) {
|
|
conn = list_entry(_p, struct rxrpc_connection, id_link);
|
|
if (connid == conn->conn_id)
|
|
goto try_next_id;
|
|
if (connid > conn->conn_id)
|
|
break;
|
|
}
|
|
|
|
_debug("selected candidate conn ID %x.%u",
|
|
ntohl(peer->addr.s_addr), ntohl(connid));
|
|
|
|
candidate->conn_id = connid;
|
|
list_add_tail(&candidate->id_link, _p);
|
|
|
|
write_unlock(&peer->conn_idlock);
|
|
|
|
/* attach to peer */
|
|
candidate->peer = peer;
|
|
|
|
write_lock(&peer->conn_lock);
|
|
|
|
/* search the peer's transport graveyard list */
|
|
spin_lock(&peer->conn_gylock);
|
|
list_for_each(_p, &peer->conn_graveyard) {
|
|
conn = list_entry(_p, struct rxrpc_connection, link);
|
|
if (conn->addr.sin_port == candidate->addr.sin_port &&
|
|
conn->security_ix == candidate->security_ix &&
|
|
conn->service_id == candidate->service_id &&
|
|
conn->in_clientflag == 0)
|
|
goto found_in_graveyard;
|
|
}
|
|
spin_unlock(&peer->conn_gylock);
|
|
|
|
/* pick the new candidate */
|
|
_debug("created connection: {%08x} [out]", ntohl(candidate->conn_id));
|
|
atomic_inc(&peer->conn_count);
|
|
conn = candidate;
|
|
candidate = NULL;
|
|
|
|
make_active:
|
|
list_add_tail(&conn->link, &peer->conn_active);
|
|
write_unlock(&peer->conn_lock);
|
|
|
|
if (candidate) {
|
|
write_lock(&peer->conn_idlock);
|
|
list_del(&candidate->id_link);
|
|
write_unlock(&peer->conn_idlock);
|
|
|
|
__RXACCT(atomic_dec(&rxrpc_connection_count));
|
|
kfree(candidate);
|
|
}
|
|
else {
|
|
down_write(&rxrpc_conns_sem);
|
|
list_add_tail(&conn->proc_link, &rxrpc_conns);
|
|
up_write(&rxrpc_conns_sem);
|
|
}
|
|
|
|
*_conn = conn;
|
|
_leave(" = 0 (%p)", conn);
|
|
|
|
return 0;
|
|
|
|
/* handle resurrecting a connection from the graveyard */
|
|
found_in_graveyard:
|
|
_debug("resurrecting connection: {%08x} [out]", ntohl(conn->conn_id));
|
|
rxrpc_get_connection(conn);
|
|
rxrpc_krxtimod_del_timer(&conn->timeout);
|
|
list_del_init(&conn->link);
|
|
spin_unlock(&peer->conn_gylock);
|
|
goto make_active;
|
|
} /* end rxrpc_create_connection() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* lookup the connection for an incoming packet
|
|
* - create a new connection record for unrecorded incoming connections
|
|
*/
|
|
int rxrpc_connection_lookup(struct rxrpc_peer *peer,
|
|
struct rxrpc_message *msg,
|
|
struct rxrpc_connection **_conn)
|
|
{
|
|
struct rxrpc_connection *conn, *candidate = NULL;
|
|
struct list_head *_p;
|
|
struct sk_buff *pkt = msg->pkt;
|
|
int ret, fresh = 0;
|
|
__be32 x_epoch, x_connid;
|
|
__be16 x_port, x_servid;
|
|
__u32 x_secix;
|
|
u8 x_clflag;
|
|
|
|
_enter("%p{{%hu}},%u,%hu",
|
|
peer,
|
|
peer->trans->port,
|
|
ntohs(pkt->h.uh->source),
|
|
ntohs(msg->hdr.serviceId));
|
|
|
|
x_port = pkt->h.uh->source;
|
|
x_epoch = msg->hdr.epoch;
|
|
x_clflag = msg->hdr.flags & RXRPC_CLIENT_INITIATED;
|
|
x_connid = htonl(ntohl(msg->hdr.cid) & RXRPC_CIDMASK);
|
|
x_servid = msg->hdr.serviceId;
|
|
x_secix = msg->hdr.securityIndex;
|
|
|
|
/* [common case] search the transport's active list first */
|
|
read_lock(&peer->conn_lock);
|
|
list_for_each(_p, &peer->conn_active) {
|
|
conn = list_entry(_p, struct rxrpc_connection, link);
|
|
if (conn->addr.sin_port == x_port &&
|
|
conn->in_epoch == x_epoch &&
|
|
conn->conn_id == x_connid &&
|
|
conn->security_ix == x_secix &&
|
|
conn->service_id == x_servid &&
|
|
conn->in_clientflag == x_clflag)
|
|
goto found_active;
|
|
}
|
|
read_unlock(&peer->conn_lock);
|
|
|
|
/* [uncommon case] not active
|
|
* - create a candidate for a new record if an inbound connection
|
|
* - only examine the graveyard for an outbound connection
|
|
*/
|
|
if (x_clflag) {
|
|
ret = __rxrpc_create_connection(peer, &candidate);
|
|
if (ret < 0) {
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/* fill in the specifics */
|
|
candidate->addr.sin_family = AF_INET;
|
|
candidate->addr.sin_port = x_port;
|
|
candidate->addr.sin_addr.s_addr = pkt->nh.iph->saddr;
|
|
candidate->in_epoch = x_epoch;
|
|
candidate->out_epoch = x_epoch;
|
|
candidate->in_clientflag = RXRPC_CLIENT_INITIATED;
|
|
candidate->out_clientflag = 0;
|
|
candidate->conn_id = x_connid;
|
|
candidate->service_id = x_servid;
|
|
candidate->security_ix = x_secix;
|
|
}
|
|
|
|
/* search the active list again, just in case it appeared whilst we
|
|
* were busy */
|
|
write_lock(&peer->conn_lock);
|
|
list_for_each(_p, &peer->conn_active) {
|
|
conn = list_entry(_p, struct rxrpc_connection, link);
|
|
if (conn->addr.sin_port == x_port &&
|
|
conn->in_epoch == x_epoch &&
|
|
conn->conn_id == x_connid &&
|
|
conn->security_ix == x_secix &&
|
|
conn->service_id == x_servid &&
|
|
conn->in_clientflag == x_clflag)
|
|
goto found_active_second_chance;
|
|
}
|
|
|
|
/* search the transport's graveyard list */
|
|
spin_lock(&peer->conn_gylock);
|
|
list_for_each(_p, &peer->conn_graveyard) {
|
|
conn = list_entry(_p, struct rxrpc_connection, link);
|
|
if (conn->addr.sin_port == x_port &&
|
|
conn->in_epoch == x_epoch &&
|
|
conn->conn_id == x_connid &&
|
|
conn->security_ix == x_secix &&
|
|
conn->service_id == x_servid &&
|
|
conn->in_clientflag == x_clflag)
|
|
goto found_in_graveyard;
|
|
}
|
|
spin_unlock(&peer->conn_gylock);
|
|
|
|
/* outbound connections aren't created here */
|
|
if (!x_clflag) {
|
|
write_unlock(&peer->conn_lock);
|
|
_leave(" = -ENOENT");
|
|
return -ENOENT;
|
|
}
|
|
|
|
/* we can now add the new candidate to the list */
|
|
_debug("created connection: {%08x} [in]", ntohl(candidate->conn_id));
|
|
rxrpc_get_peer(peer);
|
|
conn = candidate;
|
|
candidate = NULL;
|
|
atomic_inc(&peer->conn_count);
|
|
fresh = 1;
|
|
|
|
make_active:
|
|
list_add_tail(&conn->link, &peer->conn_active);
|
|
|
|
success_uwfree:
|
|
write_unlock(&peer->conn_lock);
|
|
|
|
if (candidate) {
|
|
write_lock(&peer->conn_idlock);
|
|
list_del(&candidate->id_link);
|
|
write_unlock(&peer->conn_idlock);
|
|
|
|
__RXACCT(atomic_dec(&rxrpc_connection_count));
|
|
kfree(candidate);
|
|
}
|
|
|
|
if (fresh) {
|
|
down_write(&rxrpc_conns_sem);
|
|
list_add_tail(&conn->proc_link, &rxrpc_conns);
|
|
up_write(&rxrpc_conns_sem);
|
|
}
|
|
|
|
success:
|
|
*_conn = conn;
|
|
_leave(" = 0 (%p)", conn);
|
|
return 0;
|
|
|
|
/* handle the connection being found in the active list straight off */
|
|
found_active:
|
|
rxrpc_get_connection(conn);
|
|
read_unlock(&peer->conn_lock);
|
|
goto success;
|
|
|
|
/* handle resurrecting a connection from the graveyard */
|
|
found_in_graveyard:
|
|
_debug("resurrecting connection: {%08x} [in]", ntohl(conn->conn_id));
|
|
rxrpc_get_peer(peer);
|
|
rxrpc_get_connection(conn);
|
|
rxrpc_krxtimod_del_timer(&conn->timeout);
|
|
list_del_init(&conn->link);
|
|
spin_unlock(&peer->conn_gylock);
|
|
goto make_active;
|
|
|
|
/* handle finding the connection on the second time through the active
|
|
* list */
|
|
found_active_second_chance:
|
|
rxrpc_get_connection(conn);
|
|
goto success_uwfree;
|
|
|
|
} /* end rxrpc_connection_lookup() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* finish using a connection record
|
|
* - it will be transferred to the peer's connection graveyard when refcount
|
|
* reaches 0
|
|
*/
|
|
void rxrpc_put_connection(struct rxrpc_connection *conn)
|
|
{
|
|
struct rxrpc_peer *peer;
|
|
|
|
if (!conn)
|
|
return;
|
|
|
|
_enter("%p{u=%d p=%hu}",
|
|
conn, atomic_read(&conn->usage), ntohs(conn->addr.sin_port));
|
|
|
|
peer = conn->peer;
|
|
spin_lock(&peer->conn_gylock);
|
|
|
|
/* sanity check */
|
|
if (atomic_read(&conn->usage) <= 0)
|
|
BUG();
|
|
|
|
if (likely(!atomic_dec_and_test(&conn->usage))) {
|
|
spin_unlock(&peer->conn_gylock);
|
|
_leave("");
|
|
return;
|
|
}
|
|
|
|
/* move to graveyard queue */
|
|
_debug("burying connection: {%08x}", ntohl(conn->conn_id));
|
|
list_move_tail(&conn->link, &peer->conn_graveyard);
|
|
|
|
rxrpc_krxtimod_add_timer(&conn->timeout, rxrpc_conn_timeout * HZ);
|
|
|
|
spin_unlock(&peer->conn_gylock);
|
|
|
|
rxrpc_put_peer(conn->peer);
|
|
|
|
_leave(" [killed]");
|
|
} /* end rxrpc_put_connection() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* free a connection record
|
|
*/
|
|
static void rxrpc_conn_do_timeout(struct rxrpc_connection *conn)
|
|
{
|
|
struct rxrpc_peer *peer;
|
|
|
|
_enter("%p{u=%d p=%hu}",
|
|
conn, atomic_read(&conn->usage), ntohs(conn->addr.sin_port));
|
|
|
|
peer = conn->peer;
|
|
|
|
if (atomic_read(&conn->usage) < 0)
|
|
BUG();
|
|
|
|
/* remove from graveyard if still dead */
|
|
spin_lock(&peer->conn_gylock);
|
|
if (atomic_read(&conn->usage) == 0) {
|
|
list_del_init(&conn->link);
|
|
}
|
|
else {
|
|
conn = NULL;
|
|
}
|
|
spin_unlock(&peer->conn_gylock);
|
|
|
|
if (!conn) {
|
|
_leave("");
|
|
return; /* resurrected */
|
|
}
|
|
|
|
_debug("--- Destroying Connection %p{%08x} ---",
|
|
conn, ntohl(conn->conn_id));
|
|
|
|
down_write(&rxrpc_conns_sem);
|
|
list_del(&conn->proc_link);
|
|
up_write(&rxrpc_conns_sem);
|
|
|
|
write_lock(&peer->conn_idlock);
|
|
list_del(&conn->id_link);
|
|
write_unlock(&peer->conn_idlock);
|
|
|
|
__RXACCT(atomic_dec(&rxrpc_connection_count));
|
|
kfree(conn);
|
|
|
|
/* if the graveyard is now empty, wake up anyone waiting for that */
|
|
if (atomic_dec_and_test(&peer->conn_count))
|
|
wake_up(&peer->conn_gy_waitq);
|
|
|
|
_leave(" [destroyed]");
|
|
} /* end rxrpc_conn_do_timeout() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* clear all connection records from a peer endpoint
|
|
*/
|
|
void rxrpc_conn_clearall(struct rxrpc_peer *peer)
|
|
{
|
|
DECLARE_WAITQUEUE(myself, current);
|
|
|
|
struct rxrpc_connection *conn;
|
|
int err;
|
|
|
|
_enter("%p", peer);
|
|
|
|
/* there shouldn't be any active conns remaining */
|
|
if (!list_empty(&peer->conn_active))
|
|
BUG();
|
|
|
|
/* manually timeout all conns in the graveyard */
|
|
spin_lock(&peer->conn_gylock);
|
|
while (!list_empty(&peer->conn_graveyard)) {
|
|
conn = list_entry(peer->conn_graveyard.next,
|
|
struct rxrpc_connection, link);
|
|
err = rxrpc_krxtimod_del_timer(&conn->timeout);
|
|
spin_unlock(&peer->conn_gylock);
|
|
|
|
if (err == 0)
|
|
rxrpc_conn_do_timeout(conn);
|
|
|
|
spin_lock(&peer->conn_gylock);
|
|
}
|
|
spin_unlock(&peer->conn_gylock);
|
|
|
|
/* wait for the the conn graveyard to be completely cleared */
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
add_wait_queue(&peer->conn_gy_waitq, &myself);
|
|
|
|
while (atomic_read(&peer->conn_count) != 0) {
|
|
schedule();
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
}
|
|
|
|
remove_wait_queue(&peer->conn_gy_waitq, &myself);
|
|
set_current_state(TASK_RUNNING);
|
|
|
|
_leave("");
|
|
} /* end rxrpc_conn_clearall() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* allocate and prepare a message for sending out through the transport
|
|
* endpoint
|
|
*/
|
|
int rxrpc_conn_newmsg(struct rxrpc_connection *conn,
|
|
struct rxrpc_call *call,
|
|
uint8_t type,
|
|
int dcount,
|
|
struct kvec diov[],
|
|
gfp_t alloc_flags,
|
|
struct rxrpc_message **_msg)
|
|
{
|
|
struct rxrpc_message *msg;
|
|
int loop;
|
|
|
|
_enter("%p{%d},%p,%u", conn, ntohs(conn->addr.sin_port), call, type);
|
|
|
|
if (dcount > 3) {
|
|
_leave(" = -EINVAL");
|
|
return -EINVAL;
|
|
}
|
|
|
|
msg = kmalloc(sizeof(struct rxrpc_message), alloc_flags);
|
|
if (!msg) {
|
|
_leave(" = -ENOMEM");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
memset(msg, 0, sizeof(*msg));
|
|
atomic_set(&msg->usage, 1);
|
|
|
|
INIT_LIST_HEAD(&msg->link);
|
|
|
|
msg->state = RXRPC_MSG_PREPARED;
|
|
|
|
msg->hdr.epoch = conn->out_epoch;
|
|
msg->hdr.cid = conn->conn_id | (call ? call->chan_ix : 0);
|
|
msg->hdr.callNumber = call ? call->call_id : 0;
|
|
msg->hdr.type = type;
|
|
msg->hdr.flags = conn->out_clientflag;
|
|
msg->hdr.securityIndex = conn->security_ix;
|
|
msg->hdr.serviceId = conn->service_id;
|
|
|
|
/* generate sequence numbers for data packets */
|
|
if (call) {
|
|
switch (type) {
|
|
case RXRPC_PACKET_TYPE_DATA:
|
|
msg->seq = ++call->snd_seq_count;
|
|
msg->hdr.seq = htonl(msg->seq);
|
|
break;
|
|
case RXRPC_PACKET_TYPE_ACK:
|
|
/* ACK sequence numbers are complicated. The following
|
|
* may be wrong:
|
|
* - jumbo packet ACKs should have a seq number
|
|
* - normal ACKs should not
|
|
*/
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
msg->dcount = dcount + 1;
|
|
msg->dsize = sizeof(msg->hdr);
|
|
msg->data[0].iov_len = sizeof(msg->hdr);
|
|
msg->data[0].iov_base = &msg->hdr;
|
|
|
|
for (loop=0; loop < dcount; loop++) {
|
|
msg->dsize += diov[loop].iov_len;
|
|
msg->data[loop+1].iov_len = diov[loop].iov_len;
|
|
msg->data[loop+1].iov_base = diov[loop].iov_base;
|
|
}
|
|
|
|
__RXACCT(atomic_inc(&rxrpc_message_count));
|
|
*_msg = msg;
|
|
_leave(" = 0 (%p) #%d", msg, atomic_read(&rxrpc_message_count));
|
|
return 0;
|
|
} /* end rxrpc_conn_newmsg() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* free a message
|
|
*/
|
|
void __rxrpc_put_message(struct rxrpc_message *msg)
|
|
{
|
|
int loop;
|
|
|
|
_enter("%p #%d", msg, atomic_read(&rxrpc_message_count));
|
|
|
|
if (msg->pkt)
|
|
kfree_skb(msg->pkt);
|
|
rxrpc_put_connection(msg->conn);
|
|
|
|
for (loop = 0; loop < 8; loop++)
|
|
if (test_bit(loop, &msg->dfree))
|
|
kfree(msg->data[loop].iov_base);
|
|
|
|
__RXACCT(atomic_dec(&rxrpc_message_count));
|
|
kfree(msg);
|
|
|
|
_leave("");
|
|
} /* end __rxrpc_put_message() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* send a message out through the transport endpoint
|
|
*/
|
|
int rxrpc_conn_sendmsg(struct rxrpc_connection *conn,
|
|
struct rxrpc_message *msg)
|
|
{
|
|
struct msghdr msghdr;
|
|
int ret;
|
|
|
|
_enter("%p{%d}", conn, ntohs(conn->addr.sin_port));
|
|
|
|
/* fill in some fields in the header */
|
|
spin_lock(&conn->lock);
|
|
msg->hdr.serial = htonl(++conn->serial_counter);
|
|
msg->rttdone = 0;
|
|
spin_unlock(&conn->lock);
|
|
|
|
/* set up the message to be transmitted */
|
|
msghdr.msg_name = &conn->addr;
|
|
msghdr.msg_namelen = sizeof(conn->addr);
|
|
msghdr.msg_control = NULL;
|
|
msghdr.msg_controllen = 0;
|
|
msghdr.msg_flags = MSG_CONFIRM | MSG_DONTWAIT;
|
|
|
|
_net("Sending message type %d of %Zd bytes to %08x:%d",
|
|
msg->hdr.type,
|
|
msg->dsize,
|
|
ntohl(conn->addr.sin_addr.s_addr),
|
|
ntohs(conn->addr.sin_port));
|
|
|
|
/* send the message */
|
|
ret = kernel_sendmsg(conn->trans->socket, &msghdr,
|
|
msg->data, msg->dcount, msg->dsize);
|
|
if (ret < 0) {
|
|
msg->state = RXRPC_MSG_ERROR;
|
|
} else {
|
|
msg->state = RXRPC_MSG_SENT;
|
|
ret = 0;
|
|
|
|
spin_lock(&conn->lock);
|
|
do_gettimeofday(&conn->atime);
|
|
msg->stamp = conn->atime;
|
|
spin_unlock(&conn->lock);
|
|
}
|
|
|
|
_leave(" = %d", ret);
|
|
|
|
return ret;
|
|
} /* end rxrpc_conn_sendmsg() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* deal with a subsequent call packet
|
|
*/
|
|
int rxrpc_conn_receive_call_packet(struct rxrpc_connection *conn,
|
|
struct rxrpc_call *call,
|
|
struct rxrpc_message *msg)
|
|
{
|
|
struct rxrpc_message *pmsg;
|
|
struct dst_entry *dst;
|
|
struct list_head *_p;
|
|
unsigned cix, seq;
|
|
int ret = 0;
|
|
|
|
_enter("%p,%p,%p", conn, call, msg);
|
|
|
|
if (!call) {
|
|
cix = ntohl(msg->hdr.cid) & RXRPC_CHANNELMASK;
|
|
|
|
spin_lock(&conn->lock);
|
|
call = conn->channels[cix];
|
|
|
|
if (!call || call->call_id != msg->hdr.callNumber) {
|
|
spin_unlock(&conn->lock);
|
|
rxrpc_trans_immediate_abort(conn->trans, msg, -ENOENT);
|
|
goto out;
|
|
}
|
|
else {
|
|
rxrpc_get_call(call);
|
|
spin_unlock(&conn->lock);
|
|
}
|
|
}
|
|
else {
|
|
rxrpc_get_call(call);
|
|
}
|
|
|
|
_proto("Received packet %%%u [%u] on call %hu:%u:%u",
|
|
ntohl(msg->hdr.serial),
|
|
ntohl(msg->hdr.seq),
|
|
ntohs(msg->hdr.serviceId),
|
|
ntohl(conn->conn_id),
|
|
ntohl(call->call_id));
|
|
|
|
call->pkt_rcv_count++;
|
|
|
|
dst = msg->pkt->dst;
|
|
if (dst && dst->dev)
|
|
conn->peer->if_mtu =
|
|
dst->dev->mtu - dst->dev->hard_header_len;
|
|
|
|
/* queue on the call in seq order */
|
|
rxrpc_get_message(msg);
|
|
seq = msg->seq;
|
|
|
|
spin_lock(&call->lock);
|
|
list_for_each(_p, &call->rcv_receiveq) {
|
|
pmsg = list_entry(_p, struct rxrpc_message, link);
|
|
if (pmsg->seq > seq)
|
|
break;
|
|
}
|
|
list_add_tail(&msg->link, _p);
|
|
|
|
/* reset the activity timeout */
|
|
call->flags |= RXRPC_CALL_RCV_PKT;
|
|
mod_timer(&call->rcv_timeout,jiffies + rxrpc_call_rcv_timeout * HZ);
|
|
|
|
spin_unlock(&call->lock);
|
|
|
|
rxrpc_krxiod_queue_call(call);
|
|
|
|
rxrpc_put_call(call);
|
|
out:
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
} /* end rxrpc_conn_receive_call_packet() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* handle an ICMP error being applied to a connection
|
|
*/
|
|
void rxrpc_conn_handle_error(struct rxrpc_connection *conn,
|
|
int local, int errno)
|
|
{
|
|
struct rxrpc_call *calls[4];
|
|
int loop;
|
|
|
|
_enter("%p{%d},%d", conn, ntohs(conn->addr.sin_port), errno);
|
|
|
|
/* get a ref to all my calls in one go */
|
|
memset(calls, 0, sizeof(calls));
|
|
spin_lock(&conn->lock);
|
|
|
|
for (loop = 3; loop >= 0; loop--) {
|
|
if (conn->channels[loop]) {
|
|
calls[loop] = conn->channels[loop];
|
|
rxrpc_get_call(calls[loop]);
|
|
}
|
|
}
|
|
|
|
spin_unlock(&conn->lock);
|
|
|
|
/* now kick them all */
|
|
for (loop = 3; loop >= 0; loop--) {
|
|
if (calls[loop]) {
|
|
rxrpc_call_handle_error(calls[loop], local, errno);
|
|
rxrpc_put_call(calls[loop]);
|
|
}
|
|
}
|
|
|
|
_leave("");
|
|
} /* end rxrpc_conn_handle_error() */
|
|
|