• David Miller's avatar
    xfrm: Move child route linkage into xfrm_dst. · b6ca8bd5
    David Miller authored
    XFRM bundle child chains look like this:
    
    	xdst1 --> xdst2 --> xdst3 --> path_dst
    
    All of xdstN are xfrm_dst objects and xdst->u.dst.xfrm is non-NULL.
    The final child pointer in the chain, here called 'path_dst', is some
    other kind of route such as an ipv4 or ipv6 one.
    
    The xfrm output path pops routes, one at a time, via the child
    pointer, until we hit one which has a dst->xfrm pointer which
    is NULL.
    
    We can easily preserve the above mechanisms with child sitting
    only in the xfrm_dst structure.  All children in the chain
    before we break out of the xfrm_output() loop have dst->xfrm
    non-NULL and are therefore xfrm_dst objects.
    
    Since we break out of the loop when we find dst->xfrm NULL, we
    will not try to dereference 'dst' as if it were an xfrm_dst.
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    b6ca8bd5
dst.c 8.29 KB