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SubjectRe: Ping with a 65510 bytes pack
On Sat, 19 Oct 1996, Bruno Kraychete da Costa wrote:

> It doesn't seem to work, Jon. I put the line above before put the big
> packet in trash. Take a look on what I got ... The address returned seemd
> to be kind of randomic. It should be 200.18.234.2. And I have only issued
> two big pings ... why do the syslog points 3 attempts ?!

Ok...big red face...here's a version that does actually seem to work.
It's lightly tested with my SMP linux 2.0.22 box and a coworker's Loser95
box.

Using it, I get info like:
Oversized packet received from 205.229.58.128

I get the correct number of syslog entries. I suspect the problem with
the first one was that you ended up feeding syslog garbage.

This will be really interesting to watch for in logs.

--- ip_fragment.c.orig Wed Aug 7 07:00:08 1996
+++ ip_fragment.c Sat Oct 19 20:33:42 1996
@@ -47,6 +47,8 @@

atomic_t ip_frag_mem = 0; /* Memory used for fragments */

+char *in_ntoa(unsigned long in);
+
/*
* Memory Tracking Functions
*/
@@ -366,7 +368,7 @@
{
NETDEBUG(printk("Invalid fragment list: Fragment over size.\n"));
ip_free(qp);
- frag_kfree_skb(skb,FREE_WRITE);
+ kfree_skb(skb,FREE_WRITE);
ip_statistics.IpReasmFails++;
return NULL;
}
@@ -466,6 +468,19 @@
return NULL;
}
}
+
+ /*
+ * Attempt to construct an oversize packet.
+ */
+
+ if(ntohs(iph->tot_len)+(int)offset>65535)
+ {
+ skb->sk = NULL;
+ printk("Oversized packet received from %s\n",in_ntoa(qp->iph->saddr));
+ frag_kfree_skb(skb, FREE_READ);
+ ip_statistics.IpReasmFails++;
+ return NULL;
+ }

/*
* Determine the position of this fragment.


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Jon Lewis <jlewis@fdt.net> | Unsolicited commercial e-mail will
Network Administrator | be proof-read for $199/hr.
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