From 871480933a1c28f8a9fed4c4d34d06c439a7a422 Mon Sep 17 00:00:00 2001 From: Srikant Patnaik Date: Sun, 11 Jan 2015 12:28:04 +0530 Subject: Moved, renamed, and deleted files The original directory structure was scattered and unorganized. Changes are basically to make it look like kernel structure. --- net/bridge/br_if.c | 457 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 457 insertions(+) create mode 100644 net/bridge/br_if.c (limited to 'net/bridge/br_if.c') diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c new file mode 100644 index 00000000..e1144e16 --- /dev/null +++ b/net/bridge/br_if.c @@ -0,0 +1,457 @@ +/* + * Userspace interface + * Linux ethernet bridge + * + * Authors: + * Lennert Buytenhek + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "br_private.h" + +/* + * Determine initial path cost based on speed. + * using recommendations from 802.1d standard + * + * Since driver might sleep need to not be holding any locks. + */ +static int port_cost(struct net_device *dev) +{ + struct ethtool_cmd ecmd; + + if (!__ethtool_get_settings(dev, &ecmd)) { + switch (ethtool_cmd_speed(&ecmd)) { + case SPEED_10000: + return 2; + case SPEED_1000: + return 4; + case SPEED_100: + return 19; + case SPEED_10: + return 100; + } + } + + /* Old silly heuristics based on name */ + if (!strncmp(dev->name, "lec", 3)) + return 7; + + if (!strncmp(dev->name, "plip", 4)) + return 2500; + + return 100; /* assume old 10Mbps */ +} + + +/* Check for port carrier transistions. */ +void br_port_carrier_check(struct net_bridge_port *p) +{ + struct net_device *dev = p->dev; + struct net_bridge *br = p->br; + + if (netif_running(dev) && netif_carrier_ok(dev)) + p->path_cost = port_cost(dev); + + if (!netif_running(br->dev)) + return; + + spin_lock_bh(&br->lock); + if (netif_running(dev) && netif_carrier_ok(dev)) { + if (p->state == BR_STATE_DISABLED) + br_stp_enable_port(p); + } else { + if (p->state != BR_STATE_DISABLED) + br_stp_disable_port(p); + } + spin_unlock_bh(&br->lock); +} + +static void release_nbp(struct kobject *kobj) +{ + struct net_bridge_port *p + = container_of(kobj, struct net_bridge_port, kobj); + kfree(p); +} + +static struct kobj_type brport_ktype = { +#ifdef CONFIG_SYSFS + .sysfs_ops = &brport_sysfs_ops, +#endif + .release = release_nbp, +}; + +static void destroy_nbp(struct net_bridge_port *p) +{ + struct net_device *dev = p->dev; + + p->br = NULL; + p->dev = NULL; + dev_put(dev); + + kobject_put(&p->kobj); +} + +static void destroy_nbp_rcu(struct rcu_head *head) +{ + struct net_bridge_port *p = + container_of(head, struct net_bridge_port, rcu); + destroy_nbp(p); +} + +/* Delete port(interface) from bridge is done in two steps. + * via RCU. First step, marks device as down. That deletes + * all the timers and stops new packets from flowing through. + * + * Final cleanup doesn't occur until after all CPU's finished + * processing packets. + * + * Protected from multiple admin operations by RTNL mutex + */ +static void del_nbp(struct net_bridge_port *p) +{ + struct net_bridge *br = p->br; + struct net_device *dev = p->dev; + + sysfs_remove_link(br->ifobj, p->dev->name); + + dev_set_promiscuity(dev, -1); + + spin_lock_bh(&br->lock); + br_stp_disable_port(p); + spin_unlock_bh(&br->lock); + + br_ifinfo_notify(RTM_DELLINK, p); + + br_fdb_delete_by_port(br, p, 1); + + list_del_rcu(&p->list); + + dev->priv_flags &= ~IFF_BRIDGE_PORT; + + netdev_rx_handler_unregister(dev); + synchronize_net(); + + netdev_set_master(dev, NULL); + + br_multicast_del_port(p); + + kobject_uevent(&p->kobj, KOBJ_REMOVE); + kobject_del(&p->kobj); + + br_netpoll_disable(p); + + call_rcu(&p->rcu, destroy_nbp_rcu); +} + +/* Delete bridge device */ +void br_dev_delete(struct net_device *dev, struct list_head *head) +{ + struct net_bridge *br = netdev_priv(dev); + struct net_bridge_port *p, *n; + + list_for_each_entry_safe(p, n, &br->port_list, list) { + del_nbp(p); + } + + del_timer_sync(&br->gc_timer); + + br_sysfs_delbr(br->dev); + unregister_netdevice_queue(br->dev, head); +} + +/* find an available port number */ +static int find_portno(struct net_bridge *br) +{ + int index; + struct net_bridge_port *p; + unsigned long *inuse; + + inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long), + GFP_KERNEL); + if (!inuse) + return -ENOMEM; + + set_bit(0, inuse); /* zero is reserved */ + list_for_each_entry(p, &br->port_list, list) { + set_bit(p->port_no, inuse); + } + index = find_first_zero_bit(inuse, BR_MAX_PORTS); + kfree(inuse); + + return (index >= BR_MAX_PORTS) ? -EXFULL : index; +} + +/* called with RTNL but without bridge lock */ +static struct net_bridge_port *new_nbp(struct net_bridge *br, + struct net_device *dev) +{ + int index; + struct net_bridge_port *p; + + index = find_portno(br); + if (index < 0) + return ERR_PTR(index); + + p = kzalloc(sizeof(*p), GFP_KERNEL); + if (p == NULL) + return ERR_PTR(-ENOMEM); + + p->br = br; + dev_hold(dev); + p->dev = dev; + p->path_cost = port_cost(dev); + p->priority = 0x8000 >> BR_PORT_BITS; + p->port_no = index; + p->flags = 0; + br_init_port(p); + p->state = BR_STATE_DISABLED; + br_stp_port_timer_init(p); + br_multicast_add_port(p); + + return p; +} + +int br_add_bridge(struct net *net, const char *name) +{ + struct net_device *dev; + int res; + + dev = alloc_netdev(sizeof(struct net_bridge), name, + br_dev_setup); + + if (!dev) + return -ENOMEM; + + dev_net_set(dev, net); + dev->rtnl_link_ops = &br_link_ops; + + res = register_netdev(dev); + if (res) + free_netdev(dev); + return res; +} + +int br_del_bridge(struct net *net, const char *name) +{ + struct net_device *dev; + int ret = 0; + + rtnl_lock(); + dev = __dev_get_by_name(net, name); + if (dev == NULL) + ret = -ENXIO; /* Could not find device */ + + else if (!(dev->priv_flags & IFF_EBRIDGE)) { + /* Attempt to delete non bridge device! */ + ret = -EPERM; + } + + else if (dev->flags & IFF_UP) { + /* Not shutdown yet. */ + ret = -EBUSY; + } + + else + br_dev_delete(dev, NULL); + + rtnl_unlock(); + return ret; +} + +/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */ +int br_min_mtu(const struct net_bridge *br) +{ + const struct net_bridge_port *p; + int mtu = 0; + + ASSERT_RTNL(); + + if (list_empty(&br->port_list)) + mtu = ETH_DATA_LEN; + else { + list_for_each_entry(p, &br->port_list, list) { + if (!mtu || p->dev->mtu < mtu) + mtu = p->dev->mtu; + } + } + return mtu; +} + +/* + * Recomputes features using slave's features + */ +netdev_features_t br_features_recompute(struct net_bridge *br, + netdev_features_t features) +{ + struct net_bridge_port *p; + netdev_features_t mask; + + if (list_empty(&br->port_list)) + return features; + + mask = features; + features &= ~NETIF_F_ONE_FOR_ALL; + + list_for_each_entry(p, &br->port_list, list) { + features = netdev_increment_features(features, + p->dev->features, mask); + } + + return features; +} + +/* called with RTNL */ +int br_add_if(struct net_bridge *br, struct net_device *dev) +{ + struct net_bridge_port *p; + int err = 0; + bool changed_addr; + + /* Don't allow bridging non-ethernet like devices */ + if ((dev->flags & IFF_LOOPBACK) || + dev->type != ARPHRD_ETHER || dev->addr_len != ETH_ALEN || + !is_valid_ether_addr(dev->dev_addr)) + return -EINVAL; + + /* No bridging of bridges */ + if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit) + return -ELOOP; + + /* Device is already being bridged */ + if (br_port_exists(dev)) + return -EBUSY; + + /* No bridging devices that dislike that (e.g. wireless) */ + if (dev->priv_flags & IFF_DONT_BRIDGE) + return -EOPNOTSUPP; + + p = new_nbp(br, dev); + if (IS_ERR(p)) + return PTR_ERR(p); + + call_netdevice_notifiers(NETDEV_JOIN, dev); + + err = dev_set_promiscuity(dev, 1); + if (err) + goto put_back; + + err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj), + SYSFS_BRIDGE_PORT_ATTR); + if (err) + goto err1; + + err = br_sysfs_addif(p); + if (err) + goto err2; + + if (br_netpoll_info(br) && ((err = br_netpoll_enable(p)))) + goto err3; + + err = netdev_set_master(dev, br->dev); + if (err) + goto err3; + + err = netdev_rx_handler_register(dev, br_handle_frame, p); + if (err) + goto err4; + + dev->priv_flags |= IFF_BRIDGE_PORT; + + dev_disable_lro(dev); + + list_add_rcu(&p->list, &br->port_list); + + netdev_update_features(br->dev); + + spin_lock_bh(&br->lock); + changed_addr = br_stp_recalculate_bridge_id(br); + + if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) && + (br->dev->flags & IFF_UP)) + br_stp_enable_port(p); + spin_unlock_bh(&br->lock); + + br_ifinfo_notify(RTM_NEWLINK, p); + + if (changed_addr) + call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev); + + dev_set_mtu(br->dev, br_min_mtu(br)); + + if (br_fdb_insert(br, p, dev->dev_addr)) + netdev_err(dev, "failed insert local address bridge forwarding table\n"); + + kobject_uevent(&p->kobj, KOBJ_ADD); + + return 0; + +err4: + netdev_set_master(dev, NULL); +err3: + sysfs_remove_link(br->ifobj, p->dev->name); +err2: + kobject_put(&p->kobj); + p = NULL; /* kobject_put frees */ +err1: + dev_set_promiscuity(dev, -1); +put_back: + dev_put(dev); + kfree(p); + return err; +} + +/* called with RTNL */ +int br_del_if(struct net_bridge *br, struct net_device *dev) +{ + struct net_bridge_port *p; + bool changed_addr; + + p = br_port_get_rtnl(dev); + if (!p || p->br != br) + return -EINVAL; + + del_nbp(p); + + spin_lock_bh(&br->lock); + changed_addr = br_stp_recalculate_bridge_id(br); + spin_unlock_bh(&br->lock); + + if (changed_addr) + call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev); + + netdev_update_features(br->dev); + + return 0; +} + +void __net_exit br_net_exit(struct net *net) +{ + struct net_device *dev; + LIST_HEAD(list); + + rtnl_lock(); + for_each_netdev(net, dev) + if (dev->priv_flags & IFF_EBRIDGE) + br_dev_delete(dev, &list); + + unregister_netdevice_many(&list); + rtnl_unlock(); + +} -- cgit