linux-kernel - [PATCH 3.16 216/245] net: ipv6_stub: use ip6_dst_lookup_flow instead of ip6_dst

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Date:   Fri, 24 Apr 2020 00:07:23 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Xiumei Mu" <xmu@...hat.com>,
        "Sabrina Dubroca" <sd@...asysnail.net>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.16 216/245] net: ipv6_stub: use ip6_dst_lookup_flow
 instead of ip6_dst_lookup

3.16.83-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Sabrina Dubroca <sd@...asysnail.net>

commit 6c8991f41546c3c472503dff1ea9daaddf9331c2 upstream.

ipv6_stub uses the ip6_dst_lookup function to allow other modules to
perform IPv6 lookups. However, this function skips the XFRM layer
entirely.

All users of ipv6_stub->ip6_dst_lookup use ip_route_output_flow (via the
ip_route_output_key and ip_route_output helpers) for their IPv4 lookups,
which calls xfrm_lookup_route(). This patch fixes this inconsistent
behavior by switching the stub to ip6_dst_lookup_flow, which also calls
xfrm_lookup_route().

This requires some changes in all the callers, as these two functions
take different arguments and have different return types.

Fixes: 5f81bd2e5d80 ("ipv6: export a stub for IPv6 symbols used by vxlan")
Reported-by: Xiumei Mu <xmu@...hat.com>
Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>
Signed-off-by: David S. Miller <davem@...emloft.net>
[bwh: Backported to 3.16:
 - Only vxlan uses this operation
 - Neither ip6_dst_lookup() nor ip6_dst_lookup_flow() takes a struct net
   pointer argument here
 - Adjust filename, context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1929,7 +1929,8 @@ static void vxlan_xmit_one(struct sk_buf
 		fl6.saddr = vxlan->saddr.sin6.sin6_addr;
 		fl6.flowi6_proto = IPPROTO_UDP;
 
-		if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
+		ndst = ipv6_stub->ipv6_dst_lookup_flow(sk, &fl6, NULL);
+		if (unlikely(IS_ERR(ndst))) {
 			netdev_dbg(dev, "no route to %pI6\n",
 				   &dst->sin6.sin6_addr);
 			dev->stats.tx_carrier_errors++;
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -156,8 +156,9 @@ struct ipv6_stub {
 				 const struct in6_addr *addr);
 	int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
 				 const struct in6_addr *addr);
-	int (*ipv6_dst_lookup)(struct sock *sk, struct dst_entry **dst,
-				struct flowi6 *fl6);
+	struct dst_entry *(*ipv6_dst_lookup_flow)(struct sock *sk,
+						  struct flowi6 *fl6,
+						  const struct in6_addr *final_dst);
 	void (*udpv6_encap_enable)(void);
 	void (*ndisc_send_na)(struct net_device *dev, struct neighbour *neigh,
 			      const struct in6_addr *daddr,
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -820,7 +820,7 @@ static struct pernet_operations inet6_ne
 static const struct ipv6_stub ipv6_stub_impl = {
 	.ipv6_sock_mc_join = ipv6_sock_mc_join,
 	.ipv6_sock_mc_drop = ipv6_sock_mc_drop,
-	.ipv6_dst_lookup = ip6_dst_lookup,
+	.ipv6_dst_lookup_flow = ip6_dst_lookup_flow,
 	.udpv6_encap_enable = udpv6_encap_enable,
 	.ndisc_send_na = ndisc_send_na,
 	.nd_tbl	= &nd_tbl,