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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [net/] [core/] [dev_mcast.c] - Rev 1765
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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/segment.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> /* * Device multicast list maintenance. This knows about such little matters as promiscuous mode and * converting from the list to the array the drivers use. At least until I fix the drivers up. * * 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; /* * 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; for(dmi=&dev->mc_list;*dmi!=NULL;dmi=&(*dmi)->next) { 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; *dmi=(*dmi)->next; dev->mc_count--; kfree_s(tmp,sizeof(*tmp)); 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; 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) { 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; }