Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/gi…

…t/klassert/ipsec

Steffen Klassert says:

====================
1) Fix packet receiving of standard IP tunnels when the xfrm_interface
   module is installed. From Xin Long.

2) Fix a race condition between spi allocating and hash list
   resizing. From zhuoliang zhang.
====================

Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net/ipv4/xfrm4_tunnel.c

@@ -64,14 +64,14 @@ static int xfrm_tunnel_err(struct sk_buff *skb, u32 info)
 static struct xfrm_tunnel xfrm_tunnel_handler __read_mostly = {
 	.handler	=	xfrm_tunnel_rcv,
 	.err_handler	=	xfrm_tunnel_err,
-	.priority	=	3,
+	.priority	=	4,
 };
 
 #if IS_ENABLED(CONFIG_IPV6)
 static struct xfrm_tunnel xfrm64_tunnel_handler __read_mostly = {
 	.handler	=	xfrm_tunnel_rcv,
 	.err_handler	=	xfrm_tunnel_err,
-	.priority	=	2,
+	.priority	=	3,
 };
 #endif
 

net/ipv6/xfrm6_tunnel.c

@@ -303,13 +303,13 @@ static const struct xfrm_type xfrm6_tunnel_type = {
 static struct xfrm6_tunnel xfrm6_tunnel_handler __read_mostly = {
 	.handler	= xfrm6_tunnel_rcv,
 	.err_handler	= xfrm6_tunnel_err,
-	.priority	= 2,
+	.priority	= 3,
 };
 
 static struct xfrm6_tunnel xfrm46_tunnel_handler __read_mostly = {
 	.handler	= xfrm6_tunnel_rcv,
 	.err_handler	= xfrm6_tunnel_err,
-	.priority	= 2,
+	.priority	= 3,
 };
 
 static int __net_init xfrm6_tunnel_net_init(struct net *net)

net/xfrm/xfrm_interface.c

@@ -803,14 +803,14 @@ static struct xfrm6_tunnel xfrmi_ipv6_handler __read_mostly = {
 	.handler	=	xfrmi6_rcv_tunnel,
 	.cb_handler	=	xfrmi_rcv_cb,
 	.err_handler	=	xfrmi6_err,
-	.priority	=	-1,
+	.priority	=	2,
 };
 
 static struct xfrm6_tunnel xfrmi_ip6ip_handler __read_mostly = {
 	.handler	=	xfrmi6_rcv_tunnel,
 	.cb_handler	=	xfrmi_rcv_cb,
 	.err_handler	=	xfrmi6_err,
-	.priority	=	-1,
+	.priority	=	2,
 };
 #endif
 
@@ -848,14 +848,14 @@ static struct xfrm_tunnel xfrmi_ipip_handler __read_mostly = {
 	.handler	=	xfrmi4_rcv_tunnel,
 	.cb_handler	=	xfrmi_rcv_cb,
 	.err_handler	=	xfrmi4_err,
-	.priority	=	-1,
+	.priority	=	3,
 };
 
 static struct xfrm_tunnel xfrmi_ipip6_handler __read_mostly = {
 	.handler	=	xfrmi4_rcv_tunnel,
 	.cb_handler	=	xfrmi_rcv_cb,
 	.err_handler	=	xfrmi4_err,
-	.priority	=	-1,
+	.priority	=	2,
 };
 #endif
 

net/xfrm/xfrm_state.c

@@ -2004,6 +2004,7 @@ int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
 	int err = -ENOENT;
 	__be32 minspi = htonl(low);
 	__be32 maxspi = htonl(high);
+	__be32 newspi = 0;
 	u32 mark = x->mark.v & x->mark.m;
 
 	spin_lock_bh(&x->lock);
@@ -2022,21 +2023,22 @@ int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
 			xfrm_state_put(x0);
 			goto unlock;
 		}
-		x->id.spi = minspi;
+		newspi = minspi;
 	} else {
 		u32 spi = 0;
 		for (h = 0; h < high-low+1; h++) {
 			spi = low + prandom_u32()%(high-low+1);
 			x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
 			if (x0 == NULL) {
-				x->id.spi = htonl(spi);
+				newspi = htonl(spi);
 				break;
 			}
 			xfrm_state_put(x0);
 		}
 	}
-	if (x->id.spi) {
+	if (newspi) {
 		spin_lock_bh(&net->xfrm.xfrm_state_lock);
+		x->id.spi = newspi;
 		h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
 		hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
 		spin_unlock_bh(&net->xfrm.xfrm_state_lock);