Commit f82fdf02 authored Jan 18, 2022 by Yan Yan Committed by Greg Kroah-Hartman Mar 23, 2022

xfrm: Fix xfrm migrate issues when address family changes

[ Upstream commit e03c3bba351f99ad932e8f06baa9da1afc418e02 ]

xfrm_migrate cannot handle address family change of an xfrm_state.
The symptons are the xfrm_state will be migrated to a wrong address,
and sending as well as receiving packets wil be broken.

This commit fixes it by breaking the original xfrm_state_clone
method into two steps so as to update the props.family before
running xfrm_init_state. As the result, xfrm_state's inner mode,
outer mode, type and IP header length in xfrm_state_migrate can
be updated with the new address family.

Tested with additions to Android's kernel unit test suite:
https://android-review.googlesource.com/c/kernel/tests/+/1885354



Signed-off-by: Yan Yan <evitayan@google.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

parent 1414edd2

net/xfrm/xfrm_state.c

+5 −3

Original line number	Diff line number	Diff line
		@@ -1442,9 +1442,6 @@ static struct xfrm_state xfrm_state_clone(struct xfrm_state orig,
		memcpy(&x->mark, &orig->mark, sizeof(x->mark));
		memcpy(&x->props.smark, &orig->props.smark, sizeof(x->props.smark));

		if (xfrm_init_state(x) < 0)
		goto error;

		x->props.flags = orig->props.flags;
		x->props.extra_flags = orig->props.extra_flags;

		@@ -1528,6 +1525,11 @@ struct xfrm_state xfrm_state_migrate(struct xfrm_state x,
		if (!xc)
		return NULL;

		xc->props.family = m->new_family;

		if (xfrm_init_state(xc) < 0)
		goto error;

		memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
		memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));