linux-kernel - batman-adv: design suggestions

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Date:	Tue, 10 Aug 2010 00:34:03 +0400
From:	Vasiliy Kulikov <segooon@...il.com>
To:	Greg Kroah-Hartman <gregkh@...e.de>, Andrew Lunn <andrew@...n.ch>,
	Sven Eckelmann <sven.eckelmann@....de>,
	Marek Lindner <lindner_marek@...oo.de>,
	Simon Wunderlich <siwu@....tu-chemnitz.de>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: batman-adv: design suggestions

Hi folks,

I was reading batman-adv sources and noted:


1) Some incoming packets may cause a storm of error logs, such as at
routing.c:862


	if (icmp_packet->msg_type != ECHO_REQUEST) {
		pr_warning("Warning - can't forward icmp packet from %pM to "
			   "%pM: ttl exceeded\n", icmp_packet->orig,
			   icmp_packet->dst);

  Any flooding bad guy is able to fill our disks with logs.
  This should be logged only at some slow rate (e.g. 5 logs/sec) or as
  pr_debug().


2) It seems to me that NF_HOOK() at hard-interface.c:458 is misused:

    ...
	ret = NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, dev, NULL,
		      batman_skb_recv_finish);
	if (ret != 1)
		goto err_out;

	/* packet should hold at least type and version */
	if (unlikely(skb_headlen(skb) < 2))
		goto err_free;

	/* expect a valid ethernet header here. */
	if (unlikely(skb->mac_len != sizeof(struct ethhdr)
				|| !skb_mac_header(skb)))
		goto err_free;
    ...

    static int batman_skb_recv_finish(struct sk_buff *skb)
    {
        return NF_ACCEPT;
    }

  As I understand, if there is any hook that returns NF_STOLEN, then skb
  is leaked.


Thanks,
Vasiliy.
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