1 files changed, 65 insertions, 27 deletions

diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 2a6752dae09d..fbf451c0d77a 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -437,38 +437,20 @@ static void pndisc_destructor(struct pneigh_entry *n)
         ipv6_dev_mc_dec(dev, &maddr);
 }
 
-/*
- *      Send a Neighbour Advertisement
- */
-static void __ndisc_send(struct net_device *dev,
-                         struct neighbour *neigh,
-                         const struct in6_addr *daddr,
-                         const struct in6_addr *saddr,
-                         struct icmp6hdr *icmp6h, const struct in6_addr *target,
-                         int llinfo)
+struct sk_buff *ndisc_build_skb(struct net_device *dev,
+                                const struct in6_addr *daddr,
+                                const struct in6_addr *saddr,
+                                struct icmp6hdr *icmp6h,
+                                const struct in6_addr *target,
+                                int llinfo)
 {
-        struct flowi fl;
-        struct dst_entry *dst;
         struct net *net = dev_net(dev);
         struct sock *sk = net->ipv6.ndisc_sk;
         struct sk_buff *skb;
         struct icmp6hdr *hdr;
-        struct inet6_dev *idev;
         int len;
         int err;
-        u8 *opt, type;
-
-        type = icmp6h->icmp6_type;
-
-        icmpv6_flow_init(sk, &fl, type, saddr, daddr, dev->ifindex);
-
-        dst = icmp6_dst_alloc(dev, neigh, daddr);
-        if (!dst)
-                return;
-
-        err = xfrm_lookup(&dst, &fl, NULL, 0);
-        if (err < 0)
-                return;
+        u8 *opt;
 
         if (!dev->addr_len)
                 llinfo = 0;
@@ -485,8 +467,7 @@ static void __ndisc_send(struct net_device *dev,
                 ND_PRINTK0(KERN_ERR
                            "ICMPv6 ND: %s() failed to allocate an skb.\n",
                            __func__);
-                dst_release(dst);
-                return;
+                return NULL;
         }
 
         skb_reserve(skb, LL_RESERVED_SPACE(dev));
@@ -513,6 +494,42 @@ static void __ndisc_send(struct net_device *dev,
                                            csum_partial((__u8 *) hdr,
                                                         len, 0));
 
+        return skb;
+}
+
+EXPORT_SYMBOL(ndisc_build_skb);
+
+void ndisc_send_skb(struct sk_buff *skb,
+                    struct net_device *dev,
+                    struct neighbour *neigh,
+                    const struct in6_addr *daddr,
+                    const struct in6_addr *saddr,
+                    struct icmp6hdr *icmp6h)
+{
+        struct flowi fl;
+        struct dst_entry *dst;
+        struct net *net = dev_net(dev);
+        struct sock *sk = net->ipv6.ndisc_sk;
+        struct inet6_dev *idev;
+        int err;
+        u8 type;
+
+        type = icmp6h->icmp6_type;
+
+        icmpv6_flow_init(sk, &fl, type, saddr, daddr, dev->ifindex);
+
+        dst = icmp6_dst_alloc(dev, neigh, daddr);
+        if (!dst) {
+                kfree_skb(skb);
+                return;
+        }
+
+        err = xfrm_lookup(&dst, &fl, NULL, 0);
+        if (err < 0) {
+                kfree_skb(skb);
+                return;
+        }
+
         skb->dst = dst;
 
         idev = in6_dev_get(dst->dev);
@@ -529,6 +546,27 @@ static void __ndisc_send(struct net_device *dev,
                 in6_dev_put(idev);
 }
 
+EXPORT_SYMBOL(ndisc_send_skb);
+
+/*
+ *      Send a Neighbour Discover packet
+ */
+static void __ndisc_send(struct net_device *dev,
+                         struct neighbour *neigh,
+                         const struct in6_addr *daddr,
+                         const struct in6_addr *saddr,
+                         struct icmp6hdr *icmp6h, const struct in6_addr *target,
+                         int llinfo)
+{
+        struct sk_buff *skb;
+
+        skb = ndisc_build_skb(dev, daddr, saddr, icmp6h, target, llinfo);
+        if (!skb)
+                return;
+
+        ndisc_send_skb(skb, dev, neigh, daddr, saddr, icmp6h);
+}
+
 static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
                           const struct in6_addr *daddr,
                           const struct in6_addr *solicited_addr,