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linux-sg2042
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appletalk: Add proper locking around IPDDP routing table. 

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2009-05-27 16:56:47 -07:00
parent 385a154cac
commit 5615968a70
1 changed files with 32 additions and 8 deletions
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40
drivers/net/appletalk/ipddp.c
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@ -39,6 +39,7 @@
static const char version[] = KERN_INFO "ipddp.c:v0.01 8/28/97 Bradford W. Johnson <johns393@maroon.tc.umn.edu>\n";
static struct ipddp_route *ipddp_route_list;
static DEFINE_SPINLOCK(ipddp_route_lock);
#ifdef CONFIG_IPDDP_ENCAP
static int ipddp_mode = IPDDP_ENCAP;
@ -50,7 +51,7 @@ static int ipddp_mode = IPDDP_DECAP;
static int ipddp_xmit(struct sk_buff *skb, struct net_device *dev);
static int ipddp_create(struct ipddp_route *new_rt);
static int ipddp_delete(struct ipddp_route *rt);
static struct ipddp_route* ipddp_find_route(struct ipddp_route *rt);
static struct ipddp_route* __ipddp_find_route(struct ipddp_route *rt);
static int ipddp_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
static const struct net_device_ops ipddp_netdev_ops = {
@ -119,6 +120,8 @@ static int ipddp_xmit(struct sk_buff *skb, struct net_device *dev)
struct ipddp_route *rt;
struct atalk_addr *our_addr;
spin_lock(&ipddp_route_lock);
/*
* Find appropriate route to use, based only on IP number.
*/
@ -127,8 +130,10 @@ static int ipddp_xmit(struct sk_buff *skb, struct net_device *dev)
if(rt->ip == paddr)
break;
}
if(rt == NULL)
if(rt == NULL) {
spin_unlock(&ipddp_route_lock);
return 0;
}
our_addr = atalk_find_dev_addr(rt->dev);
@ -174,6 +179,8 @@ static int ipddp_xmit(struct sk_buff *skb, struct net_device *dev)
if(aarp_send_ddp(rt->dev, skb, &rt->at, NULL) < 0)
dev_kfree_skb(skb);
spin_unlock(&ipddp_route_lock);
return 0;
}
@ -196,7 +203,9 @@ static int ipddp_create(struct ipddp_route *new_rt)
return -ENETUNREACH;
}
if (ipddp_find_route(rt)) {
spin_lock_bh(&ipddp_route_lock);
if (__ipddp_find_route(rt)) {
spin_unlock_bh(&ipddp_route_lock);
kfree(rt);
return -EEXIST;
}
@ -204,6 +213,8 @@ static int ipddp_create(struct ipddp_route *new_rt)
rt->next = ipddp_route_list;
ipddp_route_list = rt;
spin_unlock_bh(&ipddp_route_lock);
return 0;
}
@ -216,6 +227,7 @@ static int ipddp_delete(struct ipddp_route *rt)
struct ipddp_route **r = &ipddp_route_list;
struct ipddp_route *tmp;
spin_lock_bh(&ipddp_route_lock);
while((tmp = *r) != NULL)
{
if(tmp->ip == rt->ip
@ -223,19 +235,21 @@ static int ipddp_delete(struct ipddp_route *rt)
&& tmp->at.s_node == rt->at.s_node)
{
*r = tmp->next;
spin_unlock_bh(&ipddp_route_lock);
kfree(tmp);
return 0;
}
r = &tmp->next;
}
spin_unlock_bh(&ipddp_route_lock);
return (-ENOENT);
}
/*
* Find a routing entry, we only return a FULL match
*/
static struct ipddp_route* ipddp_find_route(struct ipddp_route *rt)
static struct ipddp_route* __ipddp_find_route(struct ipddp_route *rt)
{
struct ipddp_route *f;
@ -253,7 +267,7 @@ static struct ipddp_route* ipddp_find_route(struct ipddp_route *rt)
static int ipddp_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
struct ipddp_route __user *rt = ifr->ifr_data;
struct ipddp_route rcp;
struct ipddp_route rcp, rcp2, *rp;
if(!capable(CAP_NET_ADMIN))
return -EPERM;
@ -267,9 +281,19 @@ static int ipddp_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
return (ipddp_create(&rcp));
case SIOCFINDIPDDPRT:
if(copy_to_user(rt, ipddp_find_route(&rcp), sizeof(struct ipddp_route)))
return -EFAULT;
return 0;
spin_lock_bh(&ipddp_route_lock);
rp = __ipddp_find_route(&rcp);
if (rp)
memcpy(&rcp2, rp, sizeof(rcp2));
spin_unlock_bh(&ipddp_route_lock);
if (rp) {
if (copy_to_user(rt, &rcp2,
sizeof(struct ipddp_route)))
return -EFAULT;
return 0;
} else
return -ENOENT;
case SIOCDELIPDDPRT:
return (ipddp_delete(&rcp));