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[TIPC]: Improved support for Ethernet traffic filtering 

This patch simplifies TIPC's Ethernet receive routine to take
advantage of information already present in each incoming sk_buff
indicating whether the packet was explicitly sent to the interface,
has been broadcast to all interfaces, or was picked up because the
interface is in promiscous mode.

This new approach also fixes the problem of TIPC accepting unwanted
traffic through UML's multicast-based Ethernet interfaces (which
deliver traffic in a promiscuous manner even if the interface is
not configured to be promiscuous).

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Jon Paul Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Allan Stephens 2007-06-10 17:24:20 -07:00 committed by David S. Miller
parent e06e7c6158
commit f3ec75f627
1 changed files with 6 additions and 5 deletions
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11
net/tipc/eth_media.c
View File

@ -1,8 +1,8 @@
/*
* net/tipc/eth_media.c: Ethernet bearer support for TIPC
*
* Copyright (c) 2001-2006, Ericsson AB
* Copyright (c) 2005-2006, Wind River Systems
* Copyright (c) 2001-2007, Ericsson AB
* Copyright (c) 2005-2007, Wind River Systems
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -87,6 +87,9 @@ static int send_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr,
/**
* recv_msg - handle incoming TIPC message from an Ethernet interface
*
* Accept only packets explicitly sent to this node, or broadcast packets;
* ignores packets sent using Ethernet multicast, and traffic sent to other
* nodes (which can happen if interface is running in promiscuous mode).
* Routine truncates any Ethernet padding/CRC appended to the message,
* and ensures message size matches actual length
*/
@ -98,9 +101,7 @@ static int recv_msg(struct sk_buff *buf, struct net_device *dev,
u32 size;
if (likely(eb_ptr->bearer)) {
if (likely(!dev->promiscuity) ||
!memcmp(skb_mac_header(buf), dev->dev_addr, ETH_ALEN) ||
!memcmp(skb_mac_header(buf), dev->broadcast, ETH_ALEN)) {
if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
size = msg_size((struct tipc_msg *)buf->data);
skb_trim(buf, size);
if (likely(buf->len == size)) {