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RxRPC: Handle VERSION Rx protocol packets

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Handle VERSION Rx protocol packets.  We should respond to a VERSION packet
with a string indicating the Rx version.  This is a maximum of 64 characters
and is padded out to 65 chars with NUL bytes.

Note that other AFS clients use the version request as a NAT keepalive so we
need to handle it rather than returning an abort.

The standard formulation seems to be:

	<project> <version> built <yyyy>-<mm>-<dd>

for example:

	" OpenAFS 1.6.2 built  2013-05-07 "

(note the three extra spaces) as obtained with:

	rxdebug grand.mit.edu -version

from the openafs package.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2015-04-01 16:31:26 +01:00
parent bfd4e9562c
commit 44ba06987c
4 changed files with 124 additions and 2 deletions
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23
net/rxrpc/ar-input.c
View file

@ -28,7 +28,7 @@
const char *rxrpc_pkts[] = {
"?00",
"DATA", "ACK", "BUSY", "ABORT", "ACKALL", "CHALL", "RESP", "DEBUG",
"?09", "?10", "?11", "?12", "?13", "?14", "?15"
"?09", "?10", "?11", "?12", "VERSION", "?14", "?15"
};
/*
@ -593,6 +593,20 @@ static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn,
rxrpc_queue_conn(conn);
}
/*
* post endpoint-level events to the local endpoint
* - this includes debug and version messages
*/
static void rxrpc_post_packet_to_local(struct rxrpc_local *local,
struct sk_buff *skb)
{
_enter("%p,%p", local, skb);
atomic_inc(&local->usage);
skb_queue_tail(&local->event_queue, skb);
rxrpc_queue_work(&local->event_processor);
}
static struct rxrpc_connection *rxrpc_conn_from_local(struct rxrpc_local *local,
struct sk_buff *skb,
struct rxrpc_skb_priv *sp)
@ -699,6 +713,11 @@ void rxrpc_data_ready(struct sock *sk)
goto bad_message;
}
if (sp->hdr.type == RXRPC_PACKET_TYPE_VERSION) {
rxrpc_post_packet_to_local(local, skb);
goto out;
}
if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA &&
(sp->hdr.callNumber == 0 || sp->hdr.seq == 0))
goto bad_message;
@ -731,6 +750,8 @@ void rxrpc_data_ready(struct sock *sk)
else
goto cant_route_call;
}
out:
rxrpc_put_local(local);
return;