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linux
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core
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dev_mcast.c
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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@lxorguk.ukuu.org.uk> * * 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. * Gleb Natapov : Remove dev_mc_lock. * * 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 <linux/module.h> #include <asm/uaccess.h> #include <asm/system.h> #include <linux/bitops.h> #include <linux/types.h> #include <linux/kernel.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 <linux/proc_fs.h> #include <linux/seq_file.h> #include <linux/init.h> #include <net/net_namespace.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 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. * * Device mc lists are changed by bh at least if IPv6 is enabled, * so that it must be bh protected. * * We block accesses to device mc filters with netif_tx_lock. */ /* * Delete a device level multicast */ int dev_mc_delete(struct net_device *dev, void *addr, int alen, int glbl) { int err; netif_addr_lock_bh(dev); err = __dev_addr_delete(&dev->mc_list, &dev->mc_count, addr, alen, glbl); if (!err) { /* * We have altered the list, so the card * loaded filter is now wrong. Fix it */ __dev_set_rx_mode(dev); } netif_addr_unlock_bh(dev); return err; } /* * Add a device level multicast */ int dev_mc_add(struct net_device *dev, void *addr, int alen, int glbl) { int err; netif_addr_lock_bh(dev); err = __dev_addr_add(&dev->mc_list, &dev->mc_count, addr, alen, glbl); if (!err) __dev_set_rx_mode(dev); netif_addr_unlock_bh(dev); return err; } /** * dev_mc_sync - Synchronize device's multicast list to another device * @to: destination device * @from: source device * * Add newly added addresses to the destination device and release * addresses that have no users left. The source device must be * locked by netif_tx_lock_bh. * * This function is intended to be called from the dev->set_multicast_list * or dev->set_rx_mode function of layered software devices. */ int dev_mc_sync(struct net_device *to, struct net_device *from) { int err = 0; netif_addr_lock_bh(to); err = __dev_addr_sync(&to->mc_list, &to->mc_count, &from->mc_list, &from->mc_count); if (!err) __dev_set_rx_mode(to); netif_addr_unlock_bh(to); return err; } EXPORT_SYMBOL(dev_mc_sync); /** * dev_mc_unsync - Remove synchronized addresses from the destination * device * @to: destination device * @from: source device * * Remove all addresses that were added to the destination device by * dev_mc_sync(). This function is intended to be called from the * dev->stop function of layered software devices. */ void dev_mc_unsync(struct net_device *to, struct net_device *from) { netif_addr_lock_bh(from); netif_addr_lock(to); __dev_addr_unsync(&to->mc_list, &to->mc_count, &from->mc_list, &from->mc_count); __dev_set_rx_mode(to); netif_addr_unlock(to); netif_addr_unlock_bh(from); } EXPORT_SYMBOL(dev_mc_unsync); #ifdef CONFIG_PROC_FS static int dev_mc_seq_show(struct seq_file *seq, void *v) { struct dev_addr_list *m; struct net_device *dev = v; if (v == SEQ_START_TOKEN) return 0; netif_addr_lock_bh(dev); for (m = dev->mc_list; m; m = m->next) { int i; seq_printf(seq, "%-4d %-15s %-5d %-5d ", dev->ifindex, dev->name, m->dmi_users, m->dmi_gusers); for (i = 0; i < m->dmi_addrlen; i++) seq_printf(seq, "%02x", m->dmi_addr[i]); seq_putc(seq, '\n'); } netif_addr_unlock_bh(dev); return 0; } static const struct seq_operations dev_mc_seq_ops = { .start = dev_seq_start, .next = dev_seq_next, .stop = dev_seq_stop, .show = dev_mc_seq_show, }; static int dev_mc_seq_open(struct inode *inode, struct file *file) { return seq_open_net(inode, file, &dev_mc_seq_ops, sizeof(struct seq_net_private)); } static const struct file_operations dev_mc_seq_fops = { .owner = THIS_MODULE, .open = dev_mc_seq_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release_net, }; #endif static int __net_init dev_mc_net_init(struct net *net) { if (!proc_net_fops_create(net, "dev_mcast", 0, &dev_mc_seq_fops)) return -ENOMEM; return 0; } static void __net_exit dev_mc_net_exit(struct net *net) { proc_net_remove(net, "dev_mcast"); } static struct pernet_operations __net_initdata dev_mc_net_ops = { .init = dev_mc_net_init, .exit = dev_mc_net_exit, }; void __init dev_mcast_init(void) { register_pernet_subsys(&dev_mc_net_ops); } EXPORT_SYMBOL(dev_mc_add); EXPORT_SYMBOL(dev_mc_delete);
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