netdev - using the igmph structure with skb : error in value

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date:	Fri, 22 May 2009 13:19:05 +0100
From:	mopsosforum <mopsosforum@...il.com>
To:	netdev@...r.kernel.org
Subject: using the igmph structure with skb : error in value

Hi,

I work on a kernel 2.6.21 with ebtables.

I develop a module for ebtables, and I need to analyse the igmp header.

I have this function (just to see the value)

static int ebt_target (struct sk_buff           **pskb,
                        unsigned int             hooknr,
                        const struct net_device  *in,
                        const struct net_device  *out,
                        const void               *data,
                        unsigned int             datalen)

{
struct sk_buff          *skb = *pskb;
printk ("igmp type :%u\n", skb->h.igmph->type);

}

I send a igmp packet to join a group
and I recieve this

       igmp type : 70

Normaly the good value in my case is  22 (I worked with igmp v3).

I don't undestand the response?

Then I try to see the ip of the multicast group (I send for the group
239.255.1.4) , I recieve 0.0.24.0 .

It's really strange because if I try to see the ip address of the
packet, it's works  (skb->h.ipiph->daddr) : 224.0.0.22


--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html