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authorDavid Miller <davem@davemloft.net>2017-11-28 15:45:44 -0500
committerDavid S. Miller <davem@davemloft.net>2017-11-30 09:54:26 -0500
commitb6ca8bd5a9198c70c48297390723e4e56bd6e879 (patch)
tree11d7a2c8f9dcdeb28582721da6fcb0705837db25 /include/net/dst.h
parent45b018beddb631fb9a0ecbc3ba103521b03c4c80 (diff)
xfrm: Move child route linkage into xfrm_dst.
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: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/dst.h')
-rw-r--r--include/net/dst.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/include/net/dst.h b/include/net/dst.h
index acbb3fb89c4d..cef46207408c 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -35,7 +35,6 @@ struct sk_buff;
struct dst_entry {
struct net_device *dev;
struct rcu_head rcu_head;
- struct dst_entry *child;
struct dst_ops *ops;
unsigned long _metrics;
unsigned long expires;
@@ -89,7 +88,7 @@ struct dst_entry {
* Align __refcnt to a 64 bytes alignment
* (L1_CACHE_SIZE would be too much)
*/
- long __pad_to_align_refcnt[2];
+ long __pad_to_align_refcnt[3];
#endif
/*
* __refcnt wants to be on a different cache line from