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Commit 45b018be authored by David Miller's avatar David Miller Committed by David S. Miller
Browse files

ipsec: Create and use new helpers for dst child access. 



This will make a future change moving the dst->child pointer less
invasive.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Reviewed-by: default avatarEric Dumazet <edumazet@google.com>
parent b92cf4aa

include/net/xfrm.h

+5 −0
Original line number Diff line number Diff line
@@ -1004,6 +1004,11 @@ static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst) 
}



#ifdef CONFIG_XFRM

static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)

{

	xdst->u.dst.child = child;

}



static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)

{

	xfrm_pols_put(xdst->pols, xdst->num_pols);

net/xfrm/xfrm_policy.c

+23 −24
Original line number Diff line number Diff line
@@ -1546,8 +1546,8 @@ static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, 
	unsigned long now = jiffies;

	struct net_device *dev;

	struct xfrm_mode *inner_mode;

	struct dst_entry *dst_prev = NULL;

	struct dst_entry *dst0 = NULL;

	struct xfrm_dst *xdst_prev = NULL;

	struct xfrm_dst *xdst0 = NULL;

	int i = 0;

	int err;

	int header_len = 0;
@@ -1573,13 +1573,13 @@ static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, 
			goto put_states;

		}



		if (!dst_prev)

			dst0 = dst1;

		if (!xdst_prev)

			xdst0 = xdst;

		else

			/* Ref count is taken during xfrm_alloc_dst()

			 * No need to do dst_clone() on dst1

			 */

			dst_prev->child = dst1;

			xfrm_dst_set_child(xdst_prev, &xdst->u.dst);



		if (xfrm[i]->sel.family == AF_UNSPEC) {

			inner_mode = xfrm_ip2inner_mode(xfrm[i],
@@ -1616,8 +1616,8 @@ static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, 
		dst1->input = dst_discard;

		dst1->output = inner_mode->afinfo->output;



		dst1->next = dst_prev;

		dst_prev = dst1;

		dst1->next = &xdst_prev->u.dst;

		xdst_prev = xdst;



		header_len += xfrm[i]->props.header_len;

		if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
@@ -1625,40 +1625,39 @@ static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, 
		trailer_len += xfrm[i]->props.trailer_len;

	}



	dst_prev->child = dst;

	dst0->path = dst;

	xfrm_dst_set_child(xdst_prev, dst);

	xdst0->u.dst.path = dst;



	err = -ENODEV;

	dev = dst->dev;

	if (!dev)

		goto free_dst;



	xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);

	xfrm_init_pmtu(dst_prev);

	xfrm_init_path(xdst0, dst, nfheader_len);

	xfrm_init_pmtu(&xdst_prev->u.dst);



	for (dst_prev = dst0; dst_prev != dst; dst_prev = xfrm_dst_child(dst_prev)) {

		struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;



		err = xfrm_fill_dst(xdst, dev, fl);

	for (xdst_prev = xdst0; xdst_prev != (struct xfrm_dst *)dst;

	     xdst_prev = (struct xfrm_dst *) xfrm_dst_child(&xdst_prev->u.dst)) {

		err = xfrm_fill_dst(xdst_prev, dev, fl);

		if (err)

			goto free_dst;



		dst_prev->header_len = header_len;

		dst_prev->trailer_len = trailer_len;

		header_len -= xdst->u.dst.xfrm->props.header_len;

		trailer_len -= xdst->u.dst.xfrm->props.trailer_len;

		xdst_prev->u.dst.header_len = header_len;

		xdst_prev->u.dst.trailer_len = trailer_len;

		header_len -= xdst_prev->u.dst.xfrm->props.header_len;

		trailer_len -= xdst_prev->u.dst.xfrm->props.trailer_len;

	}



out:

	return dst0;

	return &xdst0->u.dst;



put_states:

	for (; i < nx; i++)

		xfrm_state_put(xfrm[i]);

free_dst:

	if (dst0)

		dst_release_immediate(dst0);

	dst0 = ERR_PTR(err);

	if (xdst0)

		dst_release_immediate(&xdst0->u.dst);

	xdst0 = ERR_PTR(err);

	goto out;

}
@@ -2012,7 +2011,7 @@ static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net, 
	dst1->output = xdst_queue_output;



	dst_hold(dst);

	dst1->child = dst;

	xfrm_dst_set_child(xdst, dst);

	dst1->path = dst;



	xfrm_init_path((struct xfrm_dst *)dst1, dst, 0);