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/*
* Linux NET3: Multicast List maintenance.
*
* Authors:
* Tim Kordas <tjk@nostromo.eeap.cwru.edu>
* Richard Underwood <richard@wuzz.demon.co.uk>
*
* Stir fried together from the IP multicast and CAP patches above
* Alan Cox <Alan.Cox@linux.org>
*
* Fixes:
* Alan Cox : Update the device on a real delete
* rather than any time but...
* Alan Cox : IFF_ALLMULTI support.
* Alan Cox : New format set_multicast_list() calls.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/bitops.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/in.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/if_ether.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <net/ip.h>
#include <net/route.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/arp.h>
#include <linux/net_alias.h>
/*
* Device multicast list maintenance.
*
* This is used both by IP and by the user level maintenance functions.
* Unlike BSD we maintain a usage count on a given multicast address so
* that a casual user application can add/delete multicasts used by
* protocols without doing damage to the protocols when it deletes the
* entries. It also helps IP as it tracks overlapping maps.
*/
/*
* Update the multicast list into the physical NIC controller.
*/
void dev_mc_upload(struct device *dev)
{
/* Don't do anything till we up the interface
[dev_open will call this function so the list will
stay sane] */
if(!(dev->flags&IFF_UP))
return;
/*
* An aliased device should end up with the combined
* multicast list of all its aliases.
* Really, multicasting with logical interfaces is very
* subtle question. Now we DO forward multicast packets
* to logical interfcases, that doubles multicast
* traffic but allows mrouted to work.
* Alas, mrouted does not understand aliases even
* in 4.4BSD --ANK
*/
dev = net_alias_main_dev(dev);
/*
* Devices with no set multicast don't get set
*/
if(dev->set_multicast_list==NULL)
return;
dev->set_multicast_list(dev);
}
/*
* Delete a device level multicast
*/
void dev_mc_delete(struct device *dev, void *addr, int alen, int all)
{
struct dev_mc_list **dmi;
dev = net_alias_main_dev(dev);
for(dmi=&dev->mc_list;*dmi!=NULL;dmi=&(*dmi)->next)
{
/*
* Find the entry we want to delete. The device could
* have variable length entries so check these too.
*/
if(memcmp((*dmi)->dmi_addr,addr,(*dmi)->dmi_addrlen)==0 && alen==(*dmi)->dmi_addrlen)
{
struct dev_mc_list *tmp= *dmi;
if(--(*dmi)->dmi_users && !all)
return;
/*
* Last user. So delete the entry.
*/
*dmi=(*dmi)->next;
dev->mc_count--;
kfree_s(tmp,sizeof(*tmp));
/*
* We have altered the list, so the card
* loaded filter is now wrong. Fix it
*/
dev_mc_upload(dev);
return;
}
}
}
/*
* Add a device level multicast
*/
void dev_mc_add(struct device *dev, void *addr, int alen, int newonly)
{
struct dev_mc_list *dmi;
dev = net_alias_main_dev(dev);
for(dmi=dev->mc_list;dmi!=NULL;dmi=dmi->next)
{
if(memcmp(dmi->dmi_addr,addr,dmi->dmi_addrlen)==0 && dmi->dmi_addrlen==alen)
{
if(!newonly)
dmi->dmi_users++;
return;
}
}
dmi=(struct dev_mc_list *)kmalloc(sizeof(*dmi),GFP_KERNEL);
if(dmi==NULL)
return; /* GFP_KERNEL so can't happen anyway */
memcpy(dmi->dmi_addr, addr, alen);
dmi->dmi_addrlen=alen;
dmi->next=dev->mc_list;
dmi->dmi_users=1;
dev->mc_list=dmi;
dev->mc_count++;
dev_mc_upload(dev);
}
/*
* Discard multicast list when a device is downed
*/
void dev_mc_discard(struct device *dev)
{
if (net_alias_is(dev))
return;
while(dev->mc_list!=NULL)
{
struct dev_mc_list *tmp=dev->mc_list;
dev->mc_list=dev->mc_list->next;
kfree_s(tmp,sizeof(*tmp));
}
dev->mc_count=0;
}
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