From 45b018beddb631fb9a0ecbc3ba103521b03c4c80 Mon Sep 17 00:00:00 2001 From: David Miller Date: Tue, 28 Nov 2017 15:40:28 -0500 Subject: [PATCH] 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: David S. Miller Reviewed-by: Eric Dumazet --- include/net/xfrm.h | 5 +++++ net/xfrm/xfrm_policy.c | 47 +++++++++++++++++++++--------------------- 2 files changed, 28 insertions(+), 24 deletions(-) diff --git a/include/net/xfrm.h b/include/net/xfrm.h index 4021b49a6ce3..4c08eb0d46ce 100644 --- a/include/net/xfrm.h +++ b/include/net/xfrm.h @@ -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); diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index 6c21a458bc8b..58b3ecba2e41 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -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);