cvs commit: src/sys/netgraph ng_ksocket.c

Gleb Smirnoff glebius at
Tue Sep 6 10:15:45 PDT 2005

glebius     2005-09-06 17:15:43 UTC

  FreeBSD src repository

  Modified files:
    sys/netgraph         ng_ksocket.c 
  When we read data from socket buffer using soreceive() the socket layer
  does not clear m_nextpkt for us. The mbufs are sent into netgraph and
  then, if they contain a TCP packet delivered locally, they will enter
  socket code again. They can pass the first assert in sbappendstream()
  because m_nextpkt may be set not in the first mbuf, but deeper in the
  chain. So the problem will trigger much later, when local program
  reads the data from socket, and an mbuf with m_nextpkt becomes a
  first one.
  This bug was demasked by revision 1.54, when I made upcall queueable.
  Before revision 1.54 there was a very small probability to have 2
  mbufs in GRE socket buffer, because ng_ksocket_incoming2() dequeued
  the first one immediately.
   - in ng_ksocket_incoming2() clear m_nextpkt on all mbufs
     read from socket.
   - restore rev. 1.54 change in ng_ksocket_incoming().
  PR:                     kern/84952
  PR:                     kern/82413
  In collaboration with:  rwatson
  Revision  Changes    Path
  1.57      +13 -4     src/sys/netgraph/ng_ksocket.c

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