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authorDavid S. Miller <davem@davemloft.net>2017-03-01 18:58:46 +0100
committerDavid S. Miller <davem@davemloft.net>2017-03-01 18:58:46 +0100
commita3695e9751b3c616170b552f8561b5a7c5b7a3ca (patch)
tree24825397ceebb356167c2740ef62497865a019d7
parentnet: solve a NAPI race (diff)
parentgeneve: lock RCU on TX path (diff)
downloadlinux-a3695e9751b3c616170b552f8561b5a7c5b7a3ca.tar.xz
linux-a3695e9751b3c616170b552f8561b5a7c5b7a3ca.zip
Merge branch 'vxlan-geneve-rcu-fixes'
Jakub Kicinski says: ==================== VXLAN/geneve RCU fixes VXLAN and GENEVE need to take RCU lock explicitly because TX path only has the _bh() flavour of RCU locked. Making the reconfiguration path wait for both normal and _bh() RCU would be bigger hassle so just acquire the lock, as suggested by Pravin: https://www.mail-archive.com/netdev@vger.kernel.org/msg155583.html ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/geneve.c2
-rw-r--r--drivers/net/vxlan.c8
2 files changed, 8 insertions, 2 deletions
diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index 45301cb98bc1..7074b40ebd7f 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -881,12 +881,14 @@ static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
info = &geneve->info;
}
+ rcu_read_lock();
#if IS_ENABLED(CONFIG_IPV6)
if (info->mode & IP_TUNNEL_INFO_IPV6)
err = geneve6_xmit_skb(skb, dev, geneve, info);
else
#endif
err = geneve_xmit_skb(skb, dev, geneve, info);
+ rcu_read_unlock();
if (likely(!err))
return NETDEV_TX_OK;
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index b7911994112a..e375560cc74e 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -2105,6 +2105,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
vxlan->cfg.port_max, true);
+ rcu_read_lock();
if (dst->sa.sa_family == AF_INET) {
struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
struct rtable *rt;
@@ -2127,7 +2128,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
dst_port, vni, &rt->dst,
rt->rt_flags);
if (err)
- return;
+ goto out_unlock;
} else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
df = htons(IP_DF);
}
@@ -2166,7 +2167,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
dst_port, vni, ndst,
rt6i_flags);
if (err)
- return;
+ goto out_unlock;
}
tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
@@ -2183,6 +2184,8 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
label, src_port, dst_port, !udp_sum);
#endif
}
+out_unlock:
+ rcu_read_unlock();
return;
drop:
@@ -2191,6 +2194,7 @@ drop:
return;
tx_error:
+ rcu_read_unlock();
if (err == -ELOOP)
dev->stats.collisions++;
else if (err == -ENETUNREACH)