sit: fix panic with route cache in ip tunnels

Bug introduced by commit 7d442fab0a67 ("ipv4: Cache dst in tunnels").

Because sit code does not call ip_tunnel_init(), the dst_cache was not
initialized.

CC: Tom Herbert <therbert@google.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h
index 48ed75c..e77c104 100644 (file)
--- a/include/net/ip_tunnels.h
+++ b/include/net/ip_tunnels.h
@@ -129,6 +129,7 @@ int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
 int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
                      struct ip_tunnel_parm *p);
 void ip_tunnel_setup(struct net_device *dev, int net_id);
+void ip_tunnel_dst_reset_all(struct ip_tunnel *t);
 
 /* Extract dsfield from inner protocol */
 static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,

diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index 08f8cf9..78a89e6 100644 (file)
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -93,13 +93,14 @@ static void tunnel_dst_reset(struct ip_tunnel *t)
        tunnel_dst_set(t, NULL);
 }
 
-static void tunnel_dst_reset_all(struct ip_tunnel *t)
+void ip_tunnel_dst_reset_all(struct ip_tunnel *t)
 {
        int i;
 
        for_each_possible_cpu(i)
                __tunnel_dst_set(per_cpu_ptr(t->dst_cache, i), NULL);
 }
+EXPORT_SYMBOL(ip_tunnel_dst_reset_all);
 
 static struct rtable *tunnel_rtable_get(struct ip_tunnel *t, u32 cookie)
 {
@@ -713,7 +714,7 @@ static void ip_tunnel_update(struct ip_tunnel_net *itn,
                if (set_mtu)
                        dev->mtu = mtu;
        }
-       tunnel_dst_reset_all(t);
+       ip_tunnel_dst_reset_all(t);
        netdev_state_change(dev);
 }
 
@@ -1042,7 +1043,7 @@ void ip_tunnel_uninit(struct net_device *dev)
        if (itn->fb_tunnel_dev != dev)
                ip_tunnel_del(netdev_priv(dev));
 
-       tunnel_dst_reset_all(tunnel);
+       ip_tunnel_dst_reset_all(tunnel);
 }
 EXPORT_SYMBOL_GPL(ip_tunnel_uninit);
 

diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 3dfbcf1..b4d74c8 100644 (file)
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -475,6 +475,7 @@ static void ipip6_tunnel_uninit(struct net_device *dev)
                ipip6_tunnel_unlink(sitn, tunnel);
                ipip6_tunnel_del_prl(tunnel, NULL);
        }
+       ip_tunnel_dst_reset_all(tunnel);
        dev_put(dev);
 }
 
@@ -1082,6 +1083,7 @@ static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p)
                t->parms.link = p->link;
                ipip6_tunnel_bind_dev(t->dev);
        }
+       ip_tunnel_dst_reset_all(t);
        netdev_state_change(t->dev);
 }
 
@@ -1112,6 +1114,7 @@ static int ipip6_tunnel_update_6rd(struct ip_tunnel *t,
        t->ip6rd.relay_prefix = relay_prefix;
        t->ip6rd.prefixlen = ip6rd->prefixlen;
        t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen;
+       ip_tunnel_dst_reset_all(t);
        netdev_state_change(t->dev);
        return 0;
 }
@@ -1271,6 +1274,7 @@ ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
                        err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
                        break;
                }
+               ip_tunnel_dst_reset_all(t);
                netdev_state_change(dev);
                break;
 
@@ -1326,6 +1330,9 @@ static const struct net_device_ops ipip6_netdev_ops = {
 
 static void ipip6_dev_free(struct net_device *dev)
 {
+       struct ip_tunnel *tunnel = netdev_priv(dev);
+
+       free_percpu(tunnel->dst_cache);
        free_percpu(dev->tstats);
        free_netdev(dev);
 }
@@ -1375,6 +1382,12 @@ static int ipip6_tunnel_init(struct net_device *dev)
                u64_stats_init(&ipip6_tunnel_stats->syncp);
        }
 
+       tunnel->dst_cache = alloc_percpu(struct ip_tunnel_dst);
+       if (!tunnel->dst_cache) {
+               free_percpu(dev->tstats);
+               return -ENOMEM;
+       }
+
        return 0;
 }
 
@@ -1405,6 +1418,12 @@ static int __net_init ipip6_fb_tunnel_init(struct net_device *dev)
                u64_stats_init(&ipip6_fb_stats->syncp);
        }
 
+       tunnel->dst_cache = alloc_percpu(struct ip_tunnel_dst);
+       if (!tunnel->dst_cache) {
+               free_percpu(dev->tstats);
+               return -ENOMEM;
+       }
+
        dev_hold(dev);
        rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
        return 0;