diff options
Diffstat (limited to 'drivers/net/appletalk/ipddp.c')
| -rw-r--r-- | drivers/net/appletalk/ipddp.c | 40 |
1 files changed, 32 insertions, 8 deletions
diff --git a/drivers/net/appletalk/ipddp.c b/drivers/net/appletalk/ipddp.c index f939e92fcf8a..9832b757f109 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 = { @@ -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)); |