Modify the sock Structure!!

[Benjamin]

Hello! I try to modify the sock Structure in sock.h in order to record 
some data!
I just add a unsigned short in the end of the structure. such as:

struct sock {
   /* Socket demultiplex comparisons on incoming packets. */
   __u32            daddr;        /* Foreign IPv4 addr            */
   __u32            rcv_saddr;    /* Bound local IPv4 addr        */

        ...................................................................
       ....................................................................



 void                    (*destruct)(struct sock *sk);
 unsigned short        data;                 /*I put the unsigned short 
here*/
};



I re-complied the kernel.  The kernel and network functions work 
normally so far.
However, I am a new guy for the kernel programming. I just wonder this 
modification is
safe or not. Is there any side-effect? Or I need to add additional code 
to avoid some unexpected
situation?  Thank you very much!

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