cvs commit: src/sys/kern subr_witness.c src/sys/netinet igmp.c in.c in_var.h ip_input.c ip_output.c

Robert Watson rwatson at
Wed Aug 24 17:30:45 GMT 2005

rwatson     2005-08-24 17:30:44 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_6)
    sys/kern             subr_witness.c 
    sys/netinet          igmp.c in.c in_var.h ip_input.c 
  Merge subr_witness.c:1.196, igmp.c:1.49, in.c:1.86, in_var.h:1.55,
  ip_input.c:1.303, ip_output.c:1.243 from HEAD to RELENG_6:
    Introduce in_multi_mtx, which will protect IPv4-layer multicast address
    lists, as well as accessor macros.  For now, this is a recursive mutex
    due code sequences where IPv4 multicast calls into IGMP calls into
    ip_output(), which then tests for a multicast forwarding case.
    For support macros in in_var.h to check multicast address lists, assert
    that in_multi_mtx is held.
    Acquire in_multi_mtx around iteration over the IPv4 multicast address
    lists, such as in ip_input() and ip_output().
    Acquire in_multi_mtx when manipulating the IPv4 layer multicast
    addresses, as well as over the manipulation of ifnet multicast address
    lists in order to keep the two layers in sync.
    Lock down accesses to IPv4 multicast addresses in IGMP, or assert the
    lock when performing IGMP join/leave events.
    Eliminate spl's associated with IPv4 multicast addresses, portions of
    IGMP that weren't previously expunged by IGMP locking.
    Add in_multi_mtx, igmp_mtx, and if_addr_mtx lock order to hard-coded
    lock order in WITNESS, in that order.
    Problem reported by:    Ed Maste <emaste at phaedrus dot sandvine dot ca>
  Approved by:    re (scottl)
  Revision   Changes    Path  +7 -0      src/sys/kern/subr_witness.c   +12 -8     src/sys/netinet/igmp.c   +18 -10    src/sys/netinet/in.c   +14 -0     src/sys/netinet/in_var.h
  1.301.2.2  +2 -0      src/sys/netinet/ip_input.c  +3 -0      src/sys/netinet/ip_output.c

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