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Date: Tue, 31 Oct 2017 23:10:47 +0900
From: "David S. Miller" <davem@...emloft.net>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>
Subject: [RFC v2 PATCH 04/11] net: Create and use new helper xfrm_dst_child().
Only IPSEC routes have a non-NULL dst->child pointer. And IPSEC
routes are identified by a non-NULL dst->xfrm pointer.
Signed-off-by: David S. Miller <davem@...emloft.net>
---
include/net/xfrm.h | 9 +++++++++
net/core/dst.c | 8 +++++---
net/ipv4/xfrm4_mode_tunnel.c | 2 +-
net/ipv6/xfrm6_mode_tunnel.c | 2 +-
net/ipv6/xfrm6_policy.c | 2 +-
net/xfrm/xfrm_output.c | 2 +-
net/xfrm/xfrm_policy.c | 12 ++++++------
security/selinux/xfrm.c | 2 +-
8 files changed, 25 insertions(+), 14 deletions(-)
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index f002a2c5e33c..be599f9bb60d 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -993,6 +993,15 @@ struct xfrm_dst {
u32 path_cookie;
};
+static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
+{
+#ifdef CONFIG_XFRM
+ if (dst->xfrm)
+ return dst->child;
+#endif
+ return NULL;
+}
+
#ifdef CONFIG_XFRM
static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
{
diff --git a/net/core/dst.c b/net/core/dst.c
index 662a2d4a3d19..6a3c21b8fc8d 100644
--- a/net/core/dst.c
+++ b/net/core/dst.c
@@ -116,12 +116,14 @@ EXPORT_SYMBOL(dst_alloc);
struct dst_entry *dst_destroy(struct dst_entry * dst)
{
- struct dst_entry *child;
+ struct dst_entry *child = NULL;
smp_rmb();
- child = dst->child;
-
+#ifdef CONFIG_XFRM
+ if (dst->xfrm)
+ child = dst->child;
+#endif
if (!(dst->flags & DST_NOCOUNT))
dst_entries_add(dst->ops, -1);
diff --git a/net/ipv4/xfrm4_mode_tunnel.c b/net/ipv4/xfrm4_mode_tunnel.c
index e6265e2c274e..7d885a44dc9d 100644
--- a/net/ipv4/xfrm4_mode_tunnel.c
+++ b/net/ipv4/xfrm4_mode_tunnel.c
@@ -62,7 +62,7 @@ static int xfrm4_mode_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
top_iph->frag_off = (flags & XFRM_STATE_NOPMTUDISC) ?
0 : (XFRM_MODE_SKB_CB(skb)->frag_off & htons(IP_DF));
- top_iph->ttl = ip4_dst_hoplimit(dst->child);
+ top_iph->ttl = ip4_dst_hoplimit(xfrm_dst_child(dst));
top_iph->saddr = x->props.saddr.a4;
top_iph->daddr = x->id.daddr.a4;
diff --git a/net/ipv6/xfrm6_mode_tunnel.c b/net/ipv6/xfrm6_mode_tunnel.c
index 02556e356f87..e66b94f46532 100644
--- a/net/ipv6/xfrm6_mode_tunnel.c
+++ b/net/ipv6/xfrm6_mode_tunnel.c
@@ -59,7 +59,7 @@ static int xfrm6_mode_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
if (x->props.flags & XFRM_STATE_NOECN)
dsfield &= ~INET_ECN_MASK;
ipv6_change_dsfield(top_iph, 0, dsfield);
- top_iph->hop_limit = ip6_dst_hoplimit(dst->child);
+ top_iph->hop_limit = ip6_dst_hoplimit(xfrm_dst_child(dst));
top_iph->saddr = *(struct in6_addr *)&x->props.saddr;
top_iph->daddr = *(struct in6_addr *)&x->id.daddr;
return 0;
diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
index 4ed9f8cc3b6a..e2e6cceef288 100644
--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -264,7 +264,7 @@ static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
in6_dev_put(xdst->u.rt6.rt6i_idev);
xdst->u.rt6.rt6i_idev = loopback_idev;
in6_dev_hold(loopback_idev);
- xdst = (struct xfrm_dst *)xdst->u.dst.child;
+ xdst = (struct xfrm_dst *)xfrm_dst_child(&xdst->u.dst);
} while (xdst->u.dst.xfrm);
__in6_dev_put(loopback_idev);
diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c
index 31a2e6d34dba..7fc0932d61ff 100644
--- a/net/xfrm/xfrm_output.c
+++ b/net/xfrm/xfrm_output.c
@@ -44,7 +44,7 @@ static int xfrm_skb_check_space(struct sk_buff *skb)
static struct dst_entry *skb_dst_pop(struct sk_buff *skb)
{
- struct dst_entry *child = dst_clone(skb_dst(skb)->child);
+ struct dst_entry *child = dst_clone(xfrm_dst_child(skb_dst(skb)));
skb_dst_drop(skb);
return child;
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index b669c624a1ec..1ecc8dbce2e2 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -1635,7 +1635,7 @@ static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
xfrm_init_pmtu(dst_prev);
- for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
+ 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);
@@ -2570,7 +2570,7 @@ static int stale_bundle(struct dst_entry *dst)
void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
{
- while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
+ while ((dst = xfrm_dst_child(dst)) && dst->xfrm && dst->dev == dev) {
dst->dev = dev_net(dev)->loopback_dev;
dev_hold(dst->dev);
dev_put(dev);
@@ -2600,7 +2600,7 @@ static void xfrm_init_pmtu(struct dst_entry *dst)
struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
u32 pmtu, route_mtu_cached;
- pmtu = dst_mtu(dst->child);
+ pmtu = dst_mtu(xfrm_dst_child(dst));
xdst->child_mtu_cached = pmtu;
pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
@@ -2645,7 +2645,7 @@ static int xfrm_bundle_ok(struct xfrm_dst *first)
xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
return 0;
- mtu = dst_mtu(dst->child);
+ mtu = dst_mtu(xfrm_dst_child(dst));
if (xdst->child_mtu_cached != mtu) {
last = xdst;
xdst->child_mtu_cached = mtu;
@@ -2659,7 +2659,7 @@ static int xfrm_bundle_ok(struct xfrm_dst *first)
xdst->route_mtu_cached = mtu;
}
- dst = dst->child;
+ dst = xfrm_dst_child(dst);
} while (dst->xfrm);
if (likely(!last))
@@ -2701,7 +2701,7 @@ static const void *xfrm_get_dst_nexthop(const struct dst_entry *dst,
{
const struct dst_entry *path = dst->path;
- for (; dst != path; dst = dst->child) {
+ for (; dst != path; dst = xfrm_dst_child(dst)) {
const struct xfrm_state *xfrm = dst->xfrm;
if (xfrm->props.mode == XFRM_MODE_TRANSPORT)
diff --git a/security/selinux/xfrm.c b/security/selinux/xfrm.c
index 56e354fcdfc6..928188902901 100644
--- a/security/selinux/xfrm.c
+++ b/security/selinux/xfrm.c
@@ -452,7 +452,7 @@ int selinux_xfrm_postroute_last(u32 sk_sid, struct sk_buff *skb,
if (dst) {
struct dst_entry *iter;
- for (iter = dst; iter != NULL; iter = iter->child) {
+ for (iter = dst; iter != NULL; iter = xfrm_dst_child(iter)) {
struct xfrm_state *x = iter->xfrm;
if (x && selinux_authorizable_xfrm(x))
--
2.13.6
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