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linux/net/rxrpc/ar-connevent.c
David Howells 519d25679e RxRPC: Don't attempt to reuse aborted connections 
Connections that have seen a connection-level abort should not be reused
as the far end will just abort them again; instead a new connection
should be made.

Connection-level aborts occur due to such things as authentication
failures.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-06-16 21:20:14 -07:00

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/* 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.
*/
#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"
/*
* pass a connection-level abort onto all calls on that connection
*/
static void rxrpc_abort_calls(struct rxrpc_connection *conn, int state,
u32 abort_code)
{
struct rxrpc_call *call;
struct rb_node *p;
_enter("{%d},%x", conn->debug_id, abort_code);
read_lock_bh(&conn->lock);
for (p = rb_first(&conn->calls); p; p = rb_next(p)) {
call = rb_entry(p, struct rxrpc_call, conn_node);
write_lock(&call->state_lock);
if (call->state <= RXRPC_CALL_COMPLETE) {
call->state = state;
call->abort_code = abort_code;
if (state == RXRPC_CALL_LOCALLY_ABORTED)
set_bit(RXRPC_CALL_CONN_ABORT, &call->events);
else
set_bit(RXRPC_CALL_RCVD_ABORT, &call->events);
rxrpc_queue_call(call);
}
write_unlock(&call->state_lock);
}
read_unlock_bh(&conn->lock);
_leave("");
}
/*
* generate a connection-level abort
*/
static int rxrpc_abort_connection(struct rxrpc_connection *conn,
u32 error, u32 abort_code)
{
struct rxrpc_header hdr;
struct msghdr msg;
struct kvec iov[2];
__be32 word;
size_t len;
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) {
conn->state = RXRPC_CONN_LOCALLY_ABORTED;
conn->error = error;
spin_unlock_bh(&conn->state_lock);
} else {
spin_unlock_bh(&conn->state_lock);
_leave(" = 0 [already dead]");
return 0;
}
rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code);
msg.msg_name = &conn->trans->peer->srx.transport.sin;
msg.msg_namelen = sizeof(conn->trans->peer->srx.transport.sin);
msg.msg_control = NULL;
msg.msg_controllen = 0;
msg.msg_flags = 0;
hdr.epoch = conn->epoch;
hdr.cid = conn->cid;
hdr.callNumber = 0;
hdr.seq = 0;
hdr.type = RXRPC_PACKET_TYPE_ABORT;
hdr.flags = conn->out_clientflag;
hdr.userStatus = 0;
hdr.securityIndex = conn->security_ix;
hdr._rsvd = 0;
hdr.serviceId = conn->service_id;
word = htonl(abort_code);
iov[0].iov_base = &hdr;
iov[0].iov_len = sizeof(hdr);
iov[1].iov_base = &word;
iov[1].iov_len = sizeof(word);
len = iov[0].iov_len + iov[1].iov_len;
hdr.serial = htonl(atomic_inc_return(&conn->serial));
_proto("Tx CONN ABORT %%%u { %d }", ntohl(hdr.serial), abort_code);
ret = kernel_sendmsg(conn->trans->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_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 tmp;
u32 serial;
int loop, ret;
if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
kleave(" = -ECONNABORTED [%u]", conn->state);
return -ECONNABORTED;
}
serial = ntohl(sp->hdr.serial);
_enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, serial);
switch (sp->hdr.type) {
case RXRPC_PACKET_TYPE_ABORT:
if (skb_copy_bits(skb, 0, &tmp, sizeof(tmp)) < 0)
return -EPROTO;
_proto("Rx ABORT %%%u { ac=%d }", serial, ntohl(tmp));
conn->state = RXRPC_CONN_REMOTELY_ABORTED;
rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED,
ntohl(tmp));
return -ECONNABORTED;
case RXRPC_PACKET_TYPE_CHALLENGE:
if (conn->security)
return conn->security->respond_to_challenge(
conn, skb, _abort_code);
return -EPROTO;
case RXRPC_PACKET_TYPE_RESPONSE:
if (!conn->security)
return -EPROTO;
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;
conn->security->prime_packet_security(conn);
read_lock_bh(&conn->lock);
spin_lock(&conn->state_lock);
if (conn->state == RXRPC_CONN_SERVER_CHALLENGING) {
conn->state = RXRPC_CONN_SERVER;
for (loop = 0; loop < RXRPC_MAXCALLS; loop++)
rxrpc_call_is_secure(conn->channels[loop]);
}
spin_unlock(&conn->state_lock);
read_unlock_bh(&conn->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->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;
}
}
ASSERT(conn->security != NULL);
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 rxrpc_skb_priv *sp;
struct sk_buff *skb;
u32 abort_code = RX_PROTOCOL_ERROR;
int ret;
_enter("{%d}", conn->debug_id);
atomic_inc(&conn->usage);
if (test_and_clear_bit(RXRPC_CONN_CHALLENGE, &conn->events)) {
rxrpc_secure_connection(conn);
rxrpc_put_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))) {
sp = rxrpc_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_put_connection(conn);
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_put_connection(conn);
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);
if (!atomic_inc_not_zero(&local->usage)) {
printk("resurrected on reject\n");
BUG();
}
skb_queue_tail(&local->reject_queue, skb);
rxrpc_queue_work(&local->rejecter);
}
/*
* reject packets through the local endpoint
*/
void rxrpc_reject_packets(struct work_struct *work)
{
union {
struct sockaddr sa;
struct sockaddr_in sin;
} sa;
struct rxrpc_skb_priv *sp;
struct rxrpc_header hdr;
struct rxrpc_local *local;
struct sk_buff *skb;
struct msghdr msg;
struct kvec iov[2];
size_t size;
__be32 code;
local = container_of(work, struct rxrpc_local, rejecter);
rxrpc_get_local(local);
_enter("%d", local->debug_id);
iov[0].iov_base = &hdr;
iov[0].iov_len = sizeof(hdr);
iov[1].iov_base = &code;
iov[1].iov_len = sizeof(code);
size = sizeof(hdr) + 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(&hdr, 0, sizeof(hdr));
hdr.type = RXRPC_PACKET_TYPE_ABORT;
while ((skb = skb_dequeue(&local->reject_queue))) {
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);
hdr.epoch = sp->hdr.epoch;
hdr.cid = sp->hdr.cid;
hdr.callNumber = sp->hdr.callNumber;
hdr.serviceId = sp->hdr.serviceId;
hdr.flags = sp->hdr.flags;
hdr.flags ^= RXRPC_CLIENT_INITIATED;
hdr.flags &= RXRPC_CLIENT_INITIATED;
kernel_sendmsg(local->socket, &msg, iov, 2, size);
break;
default:
break;
}
rxrpc_free_skb(skb);
rxrpc_put_local(local);
}
rxrpc_put_local(local);
_leave("");
}
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