300 lines
6.5 KiB
C
300 lines
6.5 KiB
C
/*
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* Linux NET3: Multicast List maintenance.
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*
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* Authors:
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* Tim Kordas <tjk@nostromo.eeap.cwru.edu>
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* Richard Underwood <richard@wuzz.demon.co.uk>
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*
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* Stir fried together from the IP multicast and CAP patches above
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* Alan Cox <Alan.Cox@linux.org>
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*
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* Fixes:
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* Alan Cox : Update the device on a real delete
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* rather than any time but...
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* Alan Cox : IFF_ALLMULTI support.
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* Alan Cox : New format set_multicast_list() calls.
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* Gleb Natapov : Remove dev_mc_lock.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <linux/bitops.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/in.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/if_ether.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/init.h>
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#include <net/ip.h>
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#include <net/route.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <net/arp.h>
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/*
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* Device multicast list maintenance.
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*
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* This is used both by IP and by the user level maintenance functions.
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* Unlike BSD we maintain a usage count on a given multicast address so
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* that a casual user application can add/delete multicasts used by
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* protocols without doing damage to the protocols when it deletes the
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* entries. It also helps IP as it tracks overlapping maps.
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*
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* Device mc lists are changed by bh at least if IPv6 is enabled,
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* so that it must be bh protected.
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*
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* We block accesses to device mc filters with dev->xmit_lock.
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*/
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/*
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* Update the multicast list into the physical NIC controller.
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*/
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static void __dev_mc_upload(struct net_device *dev)
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{
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/* Don't do anything till we up the interface
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* [dev_open will call this function so the list will
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* stay sane]
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*/
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if (!(dev->flags&IFF_UP))
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return;
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/*
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* Devices with no set multicast or which have been
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* detached don't get set.
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*/
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if (dev->set_multicast_list == NULL ||
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!netif_device_present(dev))
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return;
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dev->set_multicast_list(dev);
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}
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void dev_mc_upload(struct net_device *dev)
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{
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spin_lock_bh(&dev->xmit_lock);
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__dev_mc_upload(dev);
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spin_unlock_bh(&dev->xmit_lock);
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}
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/*
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* Delete a device level multicast
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*/
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int dev_mc_delete(struct net_device *dev, void *addr, int alen, int glbl)
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{
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int err = 0;
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struct dev_mc_list *dmi, **dmip;
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spin_lock_bh(&dev->xmit_lock);
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for (dmip = &dev->mc_list; (dmi = *dmip) != NULL; dmip = &dmi->next) {
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/*
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* Find the entry we want to delete. The device could
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* have variable length entries so check these too.
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*/
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if (memcmp(dmi->dmi_addr, addr, dmi->dmi_addrlen) == 0 &&
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alen == dmi->dmi_addrlen) {
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if (glbl) {
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int old_glbl = dmi->dmi_gusers;
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dmi->dmi_gusers = 0;
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if (old_glbl == 0)
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break;
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}
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if (--dmi->dmi_users)
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goto done;
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/*
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* Last user. So delete the entry.
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*/
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*dmip = dmi->next;
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dev->mc_count--;
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kfree(dmi);
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/*
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* We have altered the list, so the card
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* loaded filter is now wrong. Fix it
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*/
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__dev_mc_upload(dev);
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spin_unlock_bh(&dev->xmit_lock);
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return 0;
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}
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}
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err = -ENOENT;
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done:
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spin_unlock_bh(&dev->xmit_lock);
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return err;
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}
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/*
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* Add a device level multicast
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*/
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int dev_mc_add(struct net_device *dev, void *addr, int alen, int glbl)
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{
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int err = 0;
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struct dev_mc_list *dmi, *dmi1;
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dmi1 = (struct dev_mc_list *)kmalloc(sizeof(*dmi), GFP_ATOMIC);
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spin_lock_bh(&dev->xmit_lock);
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for (dmi = dev->mc_list; dmi != NULL; dmi = dmi->next) {
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if (memcmp(dmi->dmi_addr, addr, dmi->dmi_addrlen) == 0 &&
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dmi->dmi_addrlen == alen) {
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if (glbl) {
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int old_glbl = dmi->dmi_gusers;
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dmi->dmi_gusers = 1;
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if (old_glbl)
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goto done;
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}
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dmi->dmi_users++;
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goto done;
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}
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}
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if ((dmi = dmi1) == NULL) {
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spin_unlock_bh(&dev->xmit_lock);
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return -ENOMEM;
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}
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memcpy(dmi->dmi_addr, addr, alen);
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dmi->dmi_addrlen = alen;
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dmi->next = dev->mc_list;
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dmi->dmi_users = 1;
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dmi->dmi_gusers = glbl ? 1 : 0;
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dev->mc_list = dmi;
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dev->mc_count++;
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__dev_mc_upload(dev);
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spin_unlock_bh(&dev->xmit_lock);
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return 0;
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done:
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spin_unlock_bh(&dev->xmit_lock);
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if (dmi1)
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kfree(dmi1);
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return err;
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}
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/*
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* Discard multicast list when a device is downed
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*/
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void dev_mc_discard(struct net_device *dev)
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{
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spin_lock_bh(&dev->xmit_lock);
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while (dev->mc_list != NULL) {
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struct dev_mc_list *tmp = dev->mc_list;
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dev->mc_list = tmp->next;
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if (tmp->dmi_users > tmp->dmi_gusers)
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printk("dev_mc_discard: multicast leakage! dmi_users=%d\n", tmp->dmi_users);
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kfree(tmp);
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}
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dev->mc_count = 0;
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spin_unlock_bh(&dev->xmit_lock);
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}
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#ifdef CONFIG_PROC_FS
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static void *dev_mc_seq_start(struct seq_file *seq, loff_t *pos)
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{
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struct net_device *dev;
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loff_t off = 0;
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read_lock(&dev_base_lock);
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for (dev = dev_base; dev; dev = dev->next) {
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if (off++ == *pos)
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return dev;
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}
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return NULL;
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}
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static void *dev_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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struct net_device *dev = v;
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++*pos;
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return dev->next;
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}
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static void dev_mc_seq_stop(struct seq_file *seq, void *v)
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{
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read_unlock(&dev_base_lock);
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}
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static int dev_mc_seq_show(struct seq_file *seq, void *v)
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{
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struct dev_mc_list *m;
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struct net_device *dev = v;
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spin_lock_bh(&dev->xmit_lock);
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for (m = dev->mc_list; m; m = m->next) {
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int i;
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seq_printf(seq, "%-4d %-15s %-5d %-5d ", dev->ifindex,
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dev->name, m->dmi_users, m->dmi_gusers);
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for (i = 0; i < m->dmi_addrlen; i++)
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seq_printf(seq, "%02x", m->dmi_addr[i]);
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seq_putc(seq, '\n');
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}
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spin_unlock_bh(&dev->xmit_lock);
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return 0;
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}
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static struct seq_operations dev_mc_seq_ops = {
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.start = dev_mc_seq_start,
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.next = dev_mc_seq_next,
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.stop = dev_mc_seq_stop,
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.show = dev_mc_seq_show,
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};
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static int dev_mc_seq_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &dev_mc_seq_ops);
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}
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static struct file_operations dev_mc_seq_fops = {
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.owner = THIS_MODULE,
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.open = dev_mc_seq_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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#endif
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void __init dev_mcast_init(void)
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{
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proc_net_fops_create("dev_mcast", 0, &dev_mc_seq_fops);
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}
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EXPORT_SYMBOL(dev_mc_add);
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EXPORT_SYMBOL(dev_mc_delete);
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EXPORT_SYMBOL(dev_mc_upload);
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