67a5f31fc8
rtnl_addr requires that all addresses have the "peer" attribute set in order to be compared for equality, but this attribute is not normally set. As a result, most addresses will not compare as equal even to themselves, busting caching. We fix this for now by poking into the guts of libnl if it is broken...
66 lines
1.6 KiB
Plaintext
66 lines
1.6 KiB
Plaintext
AC_DEFUN([NM_LIBNL_CHECK], [
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AC_MSG_CHECKING([for libnl address caching bug])
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save_CFLAGS="$CFLAGS"
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save_LDFLAGS="$LDFLAGS"
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CFLAGS="$CFLAGS $LIBNL_CFLAGS"
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LDFLAGS="$LDFLAGS $LIBNL_LIBS"
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AC_RUN_IFELSE([
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#include <stdio.h>
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#include <netlink/route/addr.h>
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#include <netlink/object-api.h>
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int
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main (int argc, char **argv)
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{
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struct nl_handle *nlh;
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struct nl_cache *cache;
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struct nl_object *obj;
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nlh = nl_handle_alloc ();
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if (nl_connect (nlh, NETLINK_ROUTE) < 0) {
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fprintf (stderr, "couldn't connect to netlink: %s", nl_geterror ());
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return 3;
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}
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cache = rtnl_addr_alloc_cache (nlh);
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if (!cache || nl_cache_nitems (cache) == 0) {
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fprintf (stderr, "couldn't fill address cache: %s", nl_geterror ());
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return 3;
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}
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obj = nl_cache_get_first (cache);
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if (nl_object_identical (obj, obj))
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return 0;
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nl_cache_get_ops (cache)->co_obj_ops->oo_id_attrs &= ~0x80;
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if (nl_object_identical (obj, obj))
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return 1;
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else
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return 2;
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}
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], libnl_bug=$?, libnl_bug=$?, libnl_bug=cross)
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CFLAGS="$save_CFLAGS"
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LDFLAGS="$save_LDFLAGS"
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case $libnl_bug in
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0) AC_MSG_RESULT([no])
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;;
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1) AC_MSG_RESULT([yes, using workaround])
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AC_DEFINE(LIBNL_NEEDS_ADDR_CACHING_WORKAROUND, 1, [Define this to hack around buggy libnl rtnl_addr caching])
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;;
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2) AC_MSG_RESULT([yes, and workaround doesn't work])
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AC_MSG_ERROR([Installed libnl has broken address caching; please patch or upgrade])
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;;
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cross) AC_MSG_RESULT([cross-compiling... assuming it works!])
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;;
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*) AC_MSG_RESULT([?])
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AC_MSG_ERROR([libnl test program failed])
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;;
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esac
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])
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