I have written kernel(2.4) module to communicate with user application using
"Netlink Socket".
I am getting compilation error "Dereferenc ing pointer to incomplete type"
in kernel module for "nlh = (struct nlmsghdr *) skb->data" line and also
not able include "net/sock.h" header file.
plz help me how can solve this
Thanks
shashidhara
6  3689  gpraghuram 1,275
Recognized Expert Top Contributor
Hi,
What is the type of data(skb->data)?
Raghu
Hi,
What is the type of data(skb->data)?
Raghu
Data type is "struct sk_buff"
JosAH 11,448
Recognized Expert MVP
Data type is "struct sk_buff"
And what is the type of your variable 'skb'? Because that's the one you're dereferencing
and the compiler objects agains that becasuse it seems to an incomplete type,
i.e. it is declared but not defined somewhere.
kind regards,
Jos
data type is "struct sk_buff".
This is defined in linux/skbuff.h header file.
I am not able to include linux/skbuff.h and net/sock.h header files.
If i include these header files ,i will get many errors like "dereferenc ing pointer ...." and also some macros are not declared.
Why i cant include these headers file. Plz help me Sir.
Thanking u
Shashidhara HN
JosAH 11,448
Recognized Expert MVP
data type is "struct sk_buff".
This is defined in linux/skbuff.h header file.
I am not able to include linux/skbuff.h and net/sock.h header files.
If i include these header files ,i will get many errors like "dereferenc ing pointer ...." and also some macros are not declared.
Why i cant include these headers file. Plz help me Sir.
You have to find *other* .h files that define the structures and types and include
the linux/skbuff.h etc. files themselves. Always try to find the files highest in the
hierarchy, i.e. stay away as much as possible from the 'linux' subdirectory.
'grep' and 'man' are your friends here.
kind regards,
Jos
You have to find *other* .h files that define the structures and types and include
the linux/skbuff.h etc. files themselves. Always try to find the files highest in the
hierarchy, i.e. stay away as much as possible from the 'linux' subdirectory.
'grep' and 'man' are your friends here.
kind regards,
Jos
Thanks a lot sir, I got It.
--
Shashidhara HN
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