pfil(9) 맨 페이지 - 윈디하나의 솔라나라

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pfil(9)

typedef  int  (*pfil_func_t)(void  *arg, struct mbuf **mp, struct
ifnet    *,    int    dir,    struct    inpcb);    typedef    int
(*pfil_func_flags_t)(void *arg, struct mbuf **mp, struct ifnet *,
int  dir,  int  flags,  struct inpcb); The framework allows for a
specified function to be invoked for every incoming  or  outgoing
packet  for  a particular network I/O stream.  These hooks may be
used to implement a firewall or perform  packet  transformations.
Packet  filtering points are registered with Filtering points are
identified by a key and  a  data  link  type  in  the  structure.
Packet filters use the key and data link type to look up the fil‐
tering  point  with  which  they register themselves.  The key is
unique to the filtering point.  The data link type is a DLT  con‐
stant  indicating what kind of header is present on the packet at
the filtering point.  Each filtering point uses  common  per-VNET
rmlock by default.  This can be changed by specifying as field in
the  structure.  Note that specifying private lock can break fil‐
ters sharing the same ruleset and/or state between different data
link types.  Filtering points may be unregistered with the  func‐
tion.   Packet filters register/unregister themselves with a fil‐
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