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sit: fix panic with route cache in ip tunnels 

Bug introduced by commit 7d442fab0a ("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>
This commit is contained in:
Nicolas Dichtel 2014-02-20 10:19:31 +01:00 committed by David S. Miller
parent 6671b2240c
commit cf71d2bc0b
3 changed files with 24 additions and 3 deletions
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1
include/net/ip_tunnels.h
View File

@ -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,

7
net/ipv4/ip_tunnel.c
View File

@ -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);

19
net/ipv6/sit.c
View File

@ -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;