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Old 05-25-2012, 05:39 AM   #1
sunayanaiyer@gmail.com
LQ Newbie
 
Registered: May 2012
Posts: 5

Rep: Reputation: Disabled
Angry error: ‘struct sk_buff’ has no member named ‘dst’


hi all...

i have some patch of code which use sk_buff structure.
//////////////////////
while (out_queue.count > 0) {
int rc;
Entry *e;

skb = out_queue.head;
BUG_ON(!skb);

e = lookup_table(&mac_domid_map, skb->dst->neighbour->ha);
BUG_ON(!e);

rc = xmit_large_pkt(skb, e->bfh->out);

if (rc < 0) {
bf_notify(e->bfh->port);
wake_up_interruptible(&pending_wq);
break;
}

dequeue(&out_queue);

kfree_skb(skb);
}

//////////////////////
while compliling i getting this erreo:error: ‘struct sk_buff’ has no member named ‘dst’
my linux kernel information is : 2.6.32.12

can somebody please help??
 
Old 05-25-2012, 07:57 AM   #2
jhwilliams
Senior Member
 
Registered: Apr 2007
Location: Portland, OR
Distribution: Debian, Android, LFS
Posts: 1,168

Rep: Reputation: 210Reputation: 210Reputation: 210
In the 3.2, at least, It's true, there is no dst member in struct sk_buff.

Look at the definition in ./include/linux/skbuff.h, and you can see this clearly.

There is a struct dst_entry, which has _neighbour field.

There is also a fucntion:

Code:
static inline struct dst_entry *skb_dst(const struct sk_buff *skb)
So, if you have a struct sk_buff, you can use that to get a dst_entry, and then you can access neighbor.

In other words,

Code:
skb->dst->neighbour->ha
would need to become:

Code:
skb_dst(skb)->_neighbour->ha
Or similar, for ~3.2 series kernels.
 
1 members found this post helpful.
Old 05-29-2012, 01:32 AM   #3
sunayanaiyer@gmail.com
LQ Newbie
 
Registered: May 2012
Posts: 5

Original Poster
Rep: Reputation: Disabled
thank you so much jhwilliams...

Ya u were correct, i modified my code and now i am able to compile it successfully.

Actually the source code which i have is supposed to run with 2.6.18.8 but my requirement is to make it done for 2.6.32-71.el6.i686. So i thought may be if i will modify the source code according to new kernel version the problem will be solved..but when i tried to load the .ko files (insmod ***.ko) it showing me this error:insmod: error inserting 'xenloop.ko': -1 Invalid module format
after checking the log (dmesg) i got this information->disagrees about version of symbol module_layout

I am new to handling kernel things can somebody please help me...

regards
sunayana.
 
  


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