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xfrm: Move dst->path into struct xfrm_dst

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The first member of an IPSEC route bundle chain sets it's dst->path to
the underlying ipv4/ipv6 route that carries the bundle.

Stated another way, if one were to follow the xfrm_dst->child chain of
the bundle, the final non-NULL pointer would be the path and point to
either an ipv4 or an ipv6 route.

This is largely used to make sure that PMTU events propagate down to
the correct ipv4 or ipv6 route.

When we don't have the top of an IPSEC bundle 'dst->path == dst'.

Move it down into xfrm_dst and key off of dst->xfrm.

Signed-off-by: David S. Miller <[email protected]>
Reviewed-by: Eric Dumazet <[email protected]>
This commit is contained in:
David Miller 2017-11-28 15:40:46 -05:00 • committed by David S. Miller
commit 0f6c480f23
9 changed files with 33 additions and 29 deletions
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1
net/bridge/br_nf_core.c
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@ -78,7 +78,6 @@ void br_netfilter_rtable_init(struct net_bridge *br)
atomic_set(&rt->dst.__refcnt, 1);
rt->dst.dev = br->dev;
rt->dst.path = &rt->dst;
dst_init_metrics(&rt->dst, br_dst_default_metrics, true);
rt->dst.flags = DST_NOXFRM | DST_FAKE_RTABLE;
rt->dst.ops = &fake_dst_ops;