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project help

hiee there

i am able to catch the packet at the link level i.e to monitor the traffic
on the n/w. i need info regarding the following

  1) catching the packet at the n/w level
  2) after catching the packet at the n/w level stopping it from going
     to higher levels i.e rejecting it at the n/w level itself
  3) after manipulating the packet putting it back in to the n/w layer.

  is it possible to do all the above with out manipulating the kernel 
source code ??
  are system calls enough to perform the above operations ??

  please specify the ioctl commands with the specific options for the

waiting for the help.. my project depends on ur help now,,