Skip to contentSkip to conversation

Messages of a hdlc device

GENERIC HDLC LAYER henrique 4 participants 8 messages Jul 15, 2002 – Jul 16, 2002

lore
Share & tools
lore

henrique

author
#0 lore raw

Hello Halasa !!!

I'm using the generic hdlc layer with PPP protocol against a Lucent MAX6000. Everything works OK but there a kernel message bothering me:

protocol 0008 is buggy, dev hdlc0

I get this message nearly once per minute.

Do anyone know what is this message about ?
Must I worry about that ?

thanks in advance
---
Henrique Gobbi
Software Engineer
+55 11 50333339
Cyclades Corporation

author
#1 lore raw

Hello !!!

Are Halasa still maintaining the GENERIC HDLC LAYER ?

If not, how is the maintainer ?

regards
henrique

Quoted 18 lines · henrique

Hello Halasa !!!

I'm using the generic hdlc layer with PPP protocol against a Lucent MAX6000. Everything works OK but there a kernel message bothering me:

protocol 0008 is buggy, dev hdlc0

I get this message nearly once per minute.

Do anyone know what is this message about ?
Must I worry about that ?

thanks in advance
---
Henrique Gobbi
Software Engineer
+55 11 50333339
Cyclades Corporation

#2 lore raw
Quoted 1 line · henrique

Are Halasa still maintaining the GENERIC HDLC LAYER ?

Well... I think I, Krzysztof Halasa, still do that.

Not that I have much time for such things - at least for now I'm limited to patching things and possibly working on 2.5 version.

Signature · 2 lines
Krzysztof Halasa
Network Administrator
#3 lore raw
In reply to henrique
Quoted 8 lines · henrique

I'm using the generic hdlc layer with PPP protocol against a Lucent MAX6000. Everything works OK but there a kernel message bothering me:

protocol 0008 is buggy, dev hdlc0

I get this message nearly once per minute.

Do anyone know what is this message about ?

Not sure what exactly causes it. I was getting it while running tcpdump on PPP device.

Quoted 1 line

Must I worry about that ?

No.

Signature · 2 lines
Krzysztof Halasa
Network Administrator
#4 lore raw

Em Tue, Jul 16, 2002 at 03:10:33PM +0200, Krzysztof Halasa escreveu:

Quoted 5 lines
Quoted 3 lines · henrique

I'm using the generic hdlc layer with PPP protocol against a Lucent MAX6000. Everything works OK but there a kernel message bothering me:

Quoted 8 lines
Quoted 5 lines

protocol 0008 is buggy, dev hdlc0

I get this message nearly once per minute.

Do anyone know what is this message about ?

Not sure what exactly causes it. I was getting it while running tcpdump on PPP device.

This is becoming a FAQ... see net/core/dev.c, line 907 on 2.5:

    /* skb->nh should be correctly
       set by sender, so that the second statement is
       just protection against buggy protocols.
     */
    skb2->mac.raw = skb2->data;

    if (skb2->nh.raw < skb2->data || skb2->nh.raw > skb2->tail) {
            if (net_ratelimit())
                    printk(KERN_DEBUG "protocol %04x is buggy, dev %s\n",
			   skb2->protocol, dev->name);
            skb2->nh.raw = skb2->data;
    }

- Arnaldo

#5 lore raw

Hi,

Quoted 17 lines · Arnaldo Carvalho de Melo

Em Tue, Jul 16, 2002 at 03:10:33PM +0200, Krzysztof Halasa escreveu:

Quoted 5 lines
Quoted 3 lines · henrique

I'm using the generic hdlc layer with PPP protocol against a Lucent MAX6000. Everything works OK but there a kernel message bothering me:

Quoted 8 lines
Quoted 5 lines

protocol 0008 is buggy, dev hdlc0

I get this message nearly once per minute.

Do anyone know what is this message about ?

Not sure what exactly causes it. I was getting it while running tcpdump on PPP device.

This is becoming a FAQ... see net/core/dev.c, line 907 on 2.5:

Quoted 12 lines
    /* skb->nh should be correctly
       set by sender, so that the second statement is
       just protection against buggy protocols.
     */
    skb2->mac.raw = skb2->data;

    if (skb2->nh.raw < skb2->data || skb2->nh.raw > skb2->tail) {
            if (net_ratelimit())
                    printk(KERN_DEBUG "protocol %04x is buggy, dev %s\n",
			   skb2->protocol, dev->name);
            skb2->nh.raw = skb2->data;
    }

Not exactly a FAQ answer though. How about:

The error would appear to be benign. Something in the protocol stack is not setting one of the header fields correctly and this code has corrected the fault.

This error is only seen when running network monitoring software such as tcpdump as that is the only time the particular code path that detects the error is followed.

Also shouldn't that be:

Quoted 2 lines

printk(KERN_DEBUG "protocol %04x is buggy, dev %s\n",
htons(skb2->protocol), dev->name);

Signature · 1 line
        Bob Dunlop
#6 lore raw

Em Tue, Jul 16, 2002 at 04:48:17PM +0100, Bob Dunlop escreveu:

Quoted 6 lines
Quoted 6 lines

This is becoming a FAQ... see net/core/dev.c, line 907 on 2.5:

/* skb->nh should be correctly
set by sender, so that the second statement is just protection against buggy protocols.
*/

<SNIP>

Quoted 1 line

Not exactly a FAQ answer though:

Agreed, but I talked with Henrique privately (in portuguese) and give a long explanation with examples of how to fix that.

- Arnaldo

#7 lore raw
In reply to Arnaldo Carvalho de Melo
Quoted 14 lines · Arnaldo Carvalho de Melo

This is becoming a FAQ... see net/core/dev.c, line 907 on 2.5:

    /* skb->nh should be correctly
       set by sender, so that the second statement is
       just protection against buggy protocols.
     */
    skb2->mac.raw = skb2->data;

    if (skb2->nh.raw < skb2->data || skb2->nh.raw > skb2->tail) {
            if (net_ratelimit())
                    printk(KERN_DEBUG "protocol %04x is buggy, dev %s\n",
			   skb2->protocol, dev->name);
            skb2->nh.raw = skb2->data;
    }

Sure I know thats it, but I remember checking the code which resulted in nothing. Don't remember details, so I'll look at it again.

Signature · 2 lines
Krzysztof Halasa
Network Administrator