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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/input.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/input.c')
-rw-r--r--net/rxrpc/input.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c
index 3a7754c87aef..3685dbe05a8f 100644
--- a/net/rxrpc/input.c
+++ b/net/rxrpc/input.c
@@ -1017,8 +1017,11 @@ int rxrpc_extract_header(struct rxrpc_skb_priv *sp, struct sk_buff *skb)
struct rxrpc_wire_header whdr;
/* dig out the RxRPC connection details */
- if (skb_copy_bits(skb, 0, &whdr, sizeof(whdr)) < 0)
+ if (skb_copy_bits(skb, 0, &whdr, sizeof(whdr)) < 0) {
+ trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
+ tracepoint_string("bad_hdr"));
return -EBADMSG;
+ }
memset(sp, 0, sizeof(*sp));
sp->hdr.epoch = ntohl(whdr.epoch);