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path: root/drivers/net/appletalk/ipddp.c
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Diffstat (limited to 'drivers/net/appletalk/ipddp.c')
-rw-r--r--drivers/net/appletalk/ipddp.c43
1 files changed, 34 insertions, 9 deletions
diff --git a/drivers/net/appletalk/ipddp.c b/drivers/net/appletalk/ipddp.c
index da64ba88d7f8..78cea5e80b1d 100644
--- a/drivers/net/appletalk/ipddp.c
+++ b/drivers/net/appletalk/ipddp.c
@@ -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 = {
@@ -71,6 +72,7 @@ static struct net_device * __init ipddp_init(void)
if (!dev)
return ERR_PTR(-ENOMEM);
+ dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
strcpy(dev->name, "ipddp%d");
if (version_printed++ == 0)
@@ -113,11 +115,13 @@ static struct net_device * __init ipddp_init(void)
*/
static int ipddp_xmit(struct sk_buff *skb, struct net_device *dev)
{
- __be32 paddr = ((struct rtable*)skb->dst)->rt_gateway;
+ __be32 paddr = skb_rtable(skb)->rt_gateway;
struct ddpehdr *ddp;
struct ipddp_route *rt;
struct atalk_addr *our_addr;
+ spin_lock(&ipddp_route_lock);
+
/*
* Find appropriate route to use, based only on IP number.
*/
@@ -126,8 +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);
@@ -173,6 +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;
}
@@ -195,7 +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;
}
@@ -203,6 +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;
}
@@ -215,6 +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
@@ -222,19 +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;
@@ -252,7 +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;
@@ -266,9 +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));