Commit a3695e97 authored by David S. Miller's avatar David S. Miller

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/[email protected]/msg155583.html
====================
Signed-off-by: default avatarDavid S. Miller <[email protected]>
parents 39e6c820 a717e3f7
......@@ -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;
......
......@@ -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 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
return;
tx_error:
rcu_read_unlock();
if (err == -ELOOP)
dev->stats.collisions++;
else if (err == -ENETUNREACH)
......
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