cvs commit: src/sys/netinet in.h in_pcb.h ip_output.c raw_ip.c tcp_input.c udp_usrreq.c

Andre Oppermann andre at
Mon Aug 22 16:13:10 GMT 2005

andre       2005-08-22 16:13:09 UTC

  FreeBSD src repository

  Modified files:
    sys/netinet          in.h in_pcb.h ip_output.c raw_ip.c 
                         tcp_input.c udp_usrreq.c 
  Add socketoption IP_MINTTL.  May be used to set the minimum acceptable
  TTL a packet must have when received on a socket.  All packets with a
  lower TTL are silently dropped.  Works on already connected/connecting
  and listening sockets for RAW/UDP/TCP.
  This option is only really useful when set to 255 preventing packets
  from outside the directly connected networks reaching local listeners
  on sockets.
  Allows userland implementation of 'The Generalized TTL Security Mechanism
  (GTSM)' according to RFC3682.  Examples of such use include the Cisco IOS
  BGP implementation command "neighbor ttl-security".
  MFC after:      2 weeks
  Sponsored by:   TCP/IP Optimization Fundraise 2005
  Revision  Changes    Path
  1.91      +1 -0      src/sys/netinet/in.h
  1.81      +1 -0      src/sys/netinet/in_pcb.h
  1.245     +14 -0     src/sys/netinet/ip_output.c
  1.151     +3 -0      src/sys/netinet/raw_ip.c
  1.282     +5 -0      src/sys/netinet/tcp_input.c
  1.176     +3 -0      src/sys/netinet/udp_usrreq.c

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