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rxrpc: Fix connection-level abort handling

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Fix connection-level abort handling to cache the abort and error codes
properly so that a new incoming call can be properly aborted if it races
with the parent connection being aborted by another CPU.

The abort_code and error parameters can then be dropped from
rxrpc_abort_calls().

Fixes: f5c17aaeb2 ("rxrpc: Calls should only have one terminal state")
Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2018-10-08 15:46:17 +01:00
parent 298bc15b20
commit 647530924f
3 changed files with 19 additions and 15 deletions
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4
net/rxrpc/ar-internal.h
View File

@ -442,8 +442,7 @@ struct rxrpc_connection {
spinlock_t state_lock; /* state-change lock */
enum rxrpc_conn_cache_state cache_state;
enum rxrpc_conn_proto_state state; /* current state of connection */
u32 local_abort; /* local abort code */
u32 remote_abort; /* remote abort code */
u32 abort_code; /* Abort code of connection abort */
int debug_id; /* debug ID for printks */
atomic_t serial; /* packet serial number counter */
unsigned int hi_serial; /* highest serial number received */
@ -453,6 +452,7 @@ struct rxrpc_connection {
u8 security_size; /* security header size */
u8 security_ix; /* security type */
u8 out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
short error; /* Local error code */
};
static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp)

4
net/rxrpc/call_accept.c
View File

@ -405,11 +405,11 @@ struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *local,
case RXRPC_CONN_REMOTELY_ABORTED:
rxrpc_set_call_completion(call, RXRPC_CALL_REMOTELY_ABORTED,
conn->remote_abort, -ECONNABORTED);
conn->abort_code, conn->error);
break;
case RXRPC_CONN_LOCALLY_ABORTED:
rxrpc_abort_call("CON", call, sp->hdr.seq,
conn->local_abort, -ECONNABORTED);
conn->abort_code, conn->error);
break;
default:
BUG();

26
net/rxrpc/conn_event.c
View File

@ -126,7 +126,7 @@ static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
switch (chan->last_type) {
case RXRPC_PACKET_TYPE_ABORT:
_proto("Tx ABORT %%%u { %d } [re]", serial, conn->local_abort);
_proto("Tx ABORT %%%u { %d } [re]", serial, conn->abort_code);
break;
case RXRPC_PACKET_TYPE_ACK:
trace_rxrpc_tx_ack(chan->call_debug_id, serial,
@ -153,13 +153,12 @@ static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
* pass a connection-level abort onto all calls on that connection
*/
static void rxrpc_abort_calls(struct rxrpc_connection *conn,
enum rxrpc_call_completion compl,
u32 abort_code, int error)
enum rxrpc_call_completion compl)
{
struct rxrpc_call *call;
int i;
_enter("{%d},%x", conn->debug_id, abort_code);
_enter("{%d},%x", conn->debug_id, conn->abort_code);
spin_lock(&conn->channel_lock);
@ -172,9 +171,11 @@ static void rxrpc_abort_calls(struct rxrpc_connection *conn,
trace_rxrpc_abort(call->debug_id,
"CON", call->cid,
call->call_id, 0,
abort_code, error);
conn->abort_code,
conn->error);
if (rxrpc_set_call_completion(call, compl,
abort_code, error))
conn->abort_code,
conn->error))
rxrpc_notify_socket(call);
}
}
@ -207,10 +208,12 @@ static int rxrpc_abort_connection(struct rxrpc_connection *conn,
return 0;
}
conn->error = error;
conn->abort_code = abort_code;
conn->state = RXRPC_CONN_LOCALLY_ABORTED;
spin_unlock_bh(&conn->state_lock);
rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code, error);
rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED);
msg.msg_name = &conn->params.peer->srx.transport;
msg.msg_namelen = conn->params.peer->srx.transport_len;
@ -229,7 +232,7 @@ static int rxrpc_abort_connection(struct rxrpc_connection *conn,
whdr._rsvd = 0;
whdr.serviceId = htons(conn->service_id);
word = htonl(conn->local_abort);
word = htonl(conn->abort_code);
iov[0].iov_base = &whdr;
iov[0].iov_len = sizeof(whdr);
@ -240,7 +243,7 @@ static int rxrpc_abort_connection(struct rxrpc_connection *conn,
serial = atomic_inc_return(&conn->serial);
whdr.serial = htonl(serial);
_proto("Tx CONN ABORT %%%u { %d }", serial, conn->local_abort);
_proto("Tx CONN ABORT %%%u { %d }", serial, conn->abort_code);
ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
if (ret < 0) {
@ -315,9 +318,10 @@ static int rxrpc_process_event(struct rxrpc_connection *conn,
abort_code = ntohl(wtmp);
_proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code);
conn->error = -ECONNABORTED;
conn->abort_code = abort_code;
conn->state = RXRPC_CONN_REMOTELY_ABORTED;
rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED,
abort_code, -ECONNABORTED);
rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED);
return -ECONNABORTED;
case RXRPC_PACKET_TYPE_CHALLENGE: