netdev - [PATCH net-next 08/13] ipv6: ndisc: inherit metadata dst when creating ndisc requests

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Date:	Tue, 18 Aug 2015 22:33:17 +0200
From:	Jiri Benc <jbenc@...hat.com>
To:	netdev@...r.kernel.org
Cc:	Thomas Graf <tgraf@...g.ch>
Subject: [PATCH net-next 08/13] ipv6: ndisc: inherit metadata dst when creating ndisc requests

If output device wants to see the dst, inherit the dst of the original skb
in the ndisc request.

This is an IPv6 counterpart of commit 0accfc268f4d ("arp: Inherit metadata
dst when creating ARP requests").

Signed-off-by: Jiri Benc <jbenc@...hat.com>
---
 include/net/ndisc.h |  3 ++-
 net/ipv6/addrconf.c |  2 +-
 net/ipv6/ndisc.c    | 10 +++++++---
 net/ipv6/route.c    |  2 +-
 4 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/include/net/ndisc.h b/include/net/ndisc.h
index b3a7751251b4..aba5695fadb0 100644
--- a/include/net/ndisc.h
+++ b/include/net/ndisc.h
@@ -182,7 +182,8 @@ int ndisc_rcv(struct sk_buff *skb);
 
 void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
 		   const struct in6_addr *solicit,
-		   const struct in6_addr *daddr, const struct in6_addr *saddr);
+		   const struct in6_addr *daddr, const struct in6_addr *saddr,
+		   struct sk_buff *oskb);
 
 void ndisc_send_rs(struct net_device *dev,
 		   const struct in6_addr *saddr, const struct in6_addr *daddr);
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 59242399b0b5..0f08d3b9e238 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -3656,7 +3656,7 @@ static void addrconf_dad_work(struct work_struct *w)
 
 	/* send a neighbour solicitation for our addr */
 	addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
-	ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
+	ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any, NULL);
 out:
 	in6_ifa_put(ifp);
 	rtnl_unlock();
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index b3054611f88a..13d3c2beb93e 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -553,7 +553,8 @@ static void ndisc_send_unsol_na(struct net_device *dev)
 
 void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
 		   const struct in6_addr *solicit,
-		   const struct in6_addr *daddr, const struct in6_addr *saddr)
+		   const struct in6_addr *daddr, const struct in6_addr *saddr,
+		   struct sk_buff *oskb)
 {
 	struct sk_buff *skb;
 	struct in6_addr addr_buf;
@@ -589,6 +590,9 @@ void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
 		ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR,
 				       dev->dev_addr);
 
+	if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE) && oskb)
+		skb_dst_copy(skb, oskb);
+
 	ndisc_send_skb(skb, daddr, saddr);
 }
 
@@ -675,12 +679,12 @@ static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
 				  "%s: trying to ucast probe in NUD_INVALID: %pI6\n",
 				  __func__, target);
 		}
-		ndisc_send_ns(dev, neigh, target, target, saddr);
+		ndisc_send_ns(dev, neigh, target, target, saddr, skb);
 	} else if ((probes -= NEIGH_VAR(neigh->parms, APP_PROBES)) < 0) {
 		neigh_app_ns(neigh);
 	} else {
 		addrconf_addr_solict_mult(target, &mcaddr);
-		ndisc_send_ns(dev, NULL, target, &mcaddr, saddr);
+		ndisc_send_ns(dev, NULL, target, &mcaddr, saddr, skb);
 	}
 }
 
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 0947ad0b3de8..c4f3b9fcca9d 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -538,7 +538,7 @@ static void rt6_probe_deferred(struct work_struct *w)
 		container_of(w, struct __rt6_probe_work, work);
 
 	addrconf_addr_solict_mult(&work->target, &mcaddr);
-	ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL);
+	ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL, NULL);
 	dev_put(work->dev);
 	kfree(work);
 }
-- 
1.8.3.1

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