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/*
* NetBIOS name handler
*/
/*
* You must hold the netbios name lock before using these.
*/
struct nb_name *nb_name_find(struct device *dev,const char * name)
{
struct nb_name *nb=nb_name_list;
while(nb!=NULL)
{
if((dev==NULL || dev==nb->dev) &&
strncmp(name,nb->name, NB_NAME_LEN)==0)
return nb;
nb=nb->next;
}
return NULL;
}
int nb_name_add(struct device *dev, const char *name, int ours, int pri)
{
struct nb_name *nb=kmalloc(sizeof(*nb), pri);
if(nb==NULL)
return NULL;
nb->dev=dev;
strncpy(nb->name,name,NB_NAME_LEN);
nb->name[NB_NAME_LEN-1]=0;
nb->next=nb_name_list;
nb->ours=ours;
nb_name_list=nb;
}
void nb_name_delete(struct nb_name *nb)
{
struct nb_name *i=&nb_name_list;
while((*i)!=NULL)
{
if(*i==nb)
{
*i=nb->next;
kfree_s(nb,sizeof(*nb));
return;
}
i=&((*i)->next);
}
printk(KERN_ERR "nb_name_delete: bad name pointer!\n");
}
/*
* NETBIOS name handlers
*/
static void nb_defend(struct device *dev, const char *name)
{
struct sk_buff *nskb=nb_alloc_skb(NB_CONTROL_LEN, GFP_ATOMIC);
if(nskb==NULL)
return;
/* Build a name defence packet */
nskb->dev = dev;
nskb->priority = TC_PRIO_CONTROL;
dev_queue_xmit(nskb);
}
void netbeui_heard_name(struct device *dev, struct sk_buff *skb)
{
struct nb_name *nb;
name=...
if((nb=nb_name_find(dev,name))!=NULL)
{
/*
* If we own the name then defend it
*/
if(nb->our && !nb->state==NB_ACQUIRE)
nb_defend(dev,name);
/*
* A name has been resolved. Wake up pending
* connectors.
*/
if(nb->state==NB_QUERY)
{
nb->state=NB_OTHER;
nb_complete(nb,skb);
}
}
kfree_skb(skb);
return 0;
}
/*
* Handle incoming name defences
*/
void netbeui_name_defence(struct dev *dev, struct sk_buff *skb)
{
struct nb_name *name;
name=
if((nb=nb_name_find(dev,name))!=NULL)
{
if(nb->ours)
{
/*
* We wanted it, we got told its used
*/
if(nb->state==NB_ACQUIRE)
{
/*
* Fill in the record for its true
* owner. Set the state first as
* nb_complete may well delete the
* record.
*/
nb->state=NB_OTHER;
nb_complete(nb,skb);
nb_wakeup();
}
/*
* We own it we got told its used. This is
* a deep cack even that can only occur when
* a bridge comes back and the net was split.
* Make sure both sides lose.
*/
if(nb->state==NB_OURS || nb->state==NB_COLLIDE)
{
nb->state=NR_COLLIDE;
nb_wakeup();
/*
* Kill the other copy too
*/
nb_defend(dev,name);
/*
* Timer expiry will delete our
* record.
*/
nb_start_timer(nb, NB_TIME_COLLIDED);
}
}
}
kfree_skb(skb);
}
void netbeui_name_query(struct dev *dev, struct sk_buff *skb)
{
char *name=...
struct nb_name *nb=nb_find_name(dev,name);
if(nb!=NULL && nb->ours)
{
struct sk_buff *nskb=nb_alloc_skb(NB_CONTROL_LEN, GFP_ATOMIC);
if(nskb!=NULL)
{
/* Build a name reply packet */
nskb->dev = dev;
nskb->priority = TC_PRIO_CONTROL;
dev_queue_xmit(nskb);
}
}
kfree_skb(skb);
}
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