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authorDavid Howells <dhowells@redhat.com>2017-04-06 10:12:00 +0100
committerDavid Howells <dhowells@redhat.com>2017-04-06 11:09:39 +0100
commitfb46f6ee10e78799ea38cf97e4bf52cb70f1228a (patch)
tree070c369bd2417cc34c6e61b93e8567450406a55c /net/rxrpc/conn_event.c
parentef68622da9cc0c4e5202f90093a3a5314e41e9e9 (diff)
downloadlinux-fb46f6ee10e78799ea38cf97e4bf52cb70f1228a.tar.bz2
rxrpc: Trace protocol errors in received packets
Add a tracepoint (rxrpc_rx_proto) to record protocol errors in received packets. The following changes are made: (1) Add a function, __rxrpc_abort_eproto(), to note a protocol error on a call and mark the call aborted. This is wrapped by rxrpc_abort_eproto() that makes the why string usable in trace. (2) Add trace_rxrpc_rx_proto() or rxrpc_abort_eproto() to protocol error generation points, replacing rxrpc_abort_call() with the latter. (3) Only send an abort packet in rxkad_verify_packet*() if we actually managed to abort the call. Note that a trace event is also emitted if a kernel user (e.g. afs) tries to send data through a call when it's not in the transmission phase, though it's not technically a receive event. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'net/rxrpc/conn_event.c')
-rw-r--r--net/rxrpc/conn_event.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/net/rxrpc/conn_event.c b/net/rxrpc/conn_event.c
index f9d1d9cc86d8..46babcf82ce8 100644
--- a/net/rxrpc/conn_event.c
+++ b/net/rxrpc/conn_event.c
@@ -281,8 +281,11 @@ static int rxrpc_process_event(struct rxrpc_connection *conn,
case RXRPC_PACKET_TYPE_ABORT:
if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header),
- &wtmp, sizeof(wtmp)) < 0)
+ &wtmp, sizeof(wtmp)) < 0) {
+ trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
+ tracepoint_string("bad_abort"));
return -EPROTO;
+ }
abort_code = ntohl(wtmp);
_proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code);
@@ -327,7 +330,8 @@ static int rxrpc_process_event(struct rxrpc_connection *conn,
return 0;
default:
- _leave(" = -EPROTO [%u]", sp->hdr.type);
+ trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
+ tracepoint_string("bad_conn_pkt"));
return -EPROTO;
}
}
@@ -422,6 +426,5 @@ protocol_error:
if (rxrpc_abort_connection(conn, ret, abort_code) < 0)
goto requeue_and_leave;
rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
- _leave(" [EPROTO]");
goto out;
}