Yoshinobu Inoue 0b97e97cd2 Add length check to sbcreatecontrol().
Now this check is necessary because IPv6 source routing might use
  control data bigger than MLEN. (e.g. 16bytes IPv6 addr x 23 hops)
  Actually mbuf cluster should be used in uipc_socket.c:sbcreatecontrol()
  and uipc_syscalls.c:sockargs() when data size is bigger then MLEN,
  and such patches were already in KAME environment and have been
  confirmed to work well. I just forgot to merge them into 4.0, sorry.

  For safety, I'll postpone such patches until after 4.0 release.
  The effect of postponement is followings.
    -Ping6 source routing hops are limitted to around 6 or so.
    -If some apps do setsockopt IPV6_RTHDR and try to receive
     incoming IPv6 source routing info, it can't receive more
     than 6 hops source routing info.
     (But currently, no apps seems to be doing it.)

Approved by: jkh
2000-02-24 19:21:26 +00:00
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