cvs commit: src/sys/net bpf.c bpfdesc.h

[Christian S.J. Peron]

csjp        2005-07-24 17:21:18 UTC

  FreeBSD src repository

  Modified files:
    sys/net              bpf.c bpfdesc.h 
  Log:
  Introduce new sysctl variable: net.bpf.stats. This sysctl variable can
  be used to pass statistics regarding dropped, matched and received
  packet counts from the kernel to user-space. While we are here
  introduce a new counter for filtered or matched packets. We currently
  keep track of packets received or dropped by the bpf device, but not
  how many packets actually matched the bpf filter.
  
  -Introduce net.bpf.stats sysctl OID
  -Move sysctl variables after the function prototypes so we can
   reference bpf_stats_sysctl(9) without build errors.
  -Introduce bpf descriptor counter which is used mainly for sizing
   of the xbpf_d array.
  -Introduce a xbpf_d structure which will act as an external
   representation of the bpf_d structure.
  -Add a the following members to the bpfd structure:
  
          bd_fcount       - Number of packets which matched bpf filter
          bd_pid          - PID which opened the bpf device
          bd_pcomm        - Process name which opened the device.
  
  It should be noted that it's possible that the process which opened
  the device could be long gone at the time of stats collection. An
  example might be a process that opens the bpf device forks then exits
  leaving the child process with the bpf fd.
  
  Reviewed by:    mdodd
  
  Revision  Changes    Path
  1.154     +91 -14    src/sys/net/bpf.c
  1.30      +26 -0     src/sys/net/bpfdesc.h