| /* |
| * Copyright(c) 2008 Hewlett-Packard Development Company, L.P. |
| * |
| * 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. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| * |
| * The full GNU General Public License is included in this distribution in the |
| * file called LICENSE. |
| * |
| */ |
| |
| #include <linux/types.h> |
| #include <linux/if_vlan.h> |
| #include <net/ipv6.h> |
| #include <net/ndisc.h> |
| #include <net/addrconf.h> |
| #include "bonding.h" |
| |
| /* |
| * Assign bond->master_ipv6 to the next IPv6 address in the list, or |
| * zero it out if there are none. |
| */ |
| static void bond_glean_dev_ipv6(struct net_device *dev, struct in6_addr *addr) |
| { |
| struct inet6_dev *idev; |
| struct inet6_ifaddr *ifa; |
| |
| if (!dev) |
| return; |
| |
| idev = in6_dev_get(dev); |
| if (!idev) |
| return; |
| |
| read_lock_bh(&idev->lock); |
| ifa = idev->addr_list; |
| if (ifa) |
| ipv6_addr_copy(addr, &ifa->addr); |
| else |
| ipv6_addr_set(addr, 0, 0, 0, 0); |
| |
| read_unlock_bh(&idev->lock); |
| |
| in6_dev_put(idev); |
| } |
| |
| static void bond_na_send(struct net_device *slave_dev, |
| struct in6_addr *daddr, |
| int router, |
| unsigned short vlan_id) |
| { |
| struct in6_addr mcaddr; |
| struct icmp6hdr icmp6h = { |
| .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT, |
| }; |
| struct sk_buff *skb; |
| |
| icmp6h.icmp6_router = router; |
| icmp6h.icmp6_solicited = 0; |
| icmp6h.icmp6_override = 1; |
| |
| addrconf_addr_solict_mult(daddr, &mcaddr); |
| |
| pr_debug("ipv6 na on slave %s: dest %pI6, src %pI6\n", |
| slave_dev->name, &mcaddr, daddr); |
| |
| skb = ndisc_build_skb(slave_dev, &mcaddr, daddr, &icmp6h, daddr, |
| ND_OPT_TARGET_LL_ADDR); |
| |
| if (!skb) { |
| pr_err(DRV_NAME ": NA packet allocation failed\n"); |
| return; |
| } |
| |
| if (vlan_id) { |
| skb = vlan_put_tag(skb, vlan_id); |
| if (!skb) { |
| pr_err(DRV_NAME ": failed to insert VLAN tag\n"); |
| return; |
| } |
| } |
| |
| ndisc_send_skb(skb, slave_dev, NULL, &mcaddr, daddr, &icmp6h); |
| } |
| |
| /* |
| * Kick out an unsolicited Neighbor Advertisement for an IPv6 address on |
| * the bonding master. This will help the switch learn our address |
| * if in active-backup mode. |
| * |
| * Caller must hold curr_slave_lock for read or better |
| */ |
| void bond_send_unsolicited_na(struct bonding *bond) |
| { |
| struct slave *slave = bond->curr_active_slave; |
| struct vlan_entry *vlan; |
| struct inet6_dev *idev; |
| int is_router; |
| |
| pr_debug("bond_send_unsol_na: bond %s slave %s\n", bond->dev->name, |
| slave ? slave->dev->name : "NULL"); |
| |
| if (!slave || !bond->send_unsol_na || |
| test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) |
| return; |
| |
| bond->send_unsol_na--; |
| |
| idev = in6_dev_get(bond->dev); |
| if (!idev) |
| return; |
| |
| is_router = !!idev->cnf.forwarding; |
| |
| in6_dev_put(idev); |
| |
| if (!ipv6_addr_any(&bond->master_ipv6)) |
| bond_na_send(slave->dev, &bond->master_ipv6, is_router, 0); |
| |
| list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { |
| if (!ipv6_addr_any(&vlan->vlan_ipv6)) { |
| bond_na_send(slave->dev, &vlan->vlan_ipv6, is_router, |
| vlan->vlan_id); |
| } |
| } |
| } |
| |
| /* |
| * bond_inet6addr_event: handle inet6addr notifier chain events. |
| * |
| * We keep track of device IPv6 addresses primarily to use as source |
| * addresses in NS probes. |
| * |
| * We track one IPv6 for the main device (if it has one). |
| */ |
| static int bond_inet6addr_event(struct notifier_block *this, |
| unsigned long event, |
| void *ptr) |
| { |
| struct inet6_ifaddr *ifa = ptr; |
| struct net_device *vlan_dev, *event_dev = ifa->idev->dev; |
| struct bonding *bond; |
| struct vlan_entry *vlan; |
| |
| if (dev_net(event_dev) != &init_net) |
| return NOTIFY_DONE; |
| |
| list_for_each_entry(bond, &bond_dev_list, bond_list) { |
| if (bond->dev == event_dev) { |
| switch (event) { |
| case NETDEV_UP: |
| if (ipv6_addr_any(&bond->master_ipv6)) |
| ipv6_addr_copy(&bond->master_ipv6, |
| &ifa->addr); |
| return NOTIFY_OK; |
| case NETDEV_DOWN: |
| if (ipv6_addr_equal(&bond->master_ipv6, |
| &ifa->addr)) |
| bond_glean_dev_ipv6(bond->dev, |
| &bond->master_ipv6); |
| return NOTIFY_OK; |
| default: |
| return NOTIFY_DONE; |
| } |
| } |
| |
| list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { |
| if (!bond->vlgrp) |
| continue; |
| vlan_dev = vlan_group_get_device(bond->vlgrp, |
| vlan->vlan_id); |
| if (vlan_dev == event_dev) { |
| switch (event) { |
| case NETDEV_UP: |
| if (ipv6_addr_any(&vlan->vlan_ipv6)) |
| ipv6_addr_copy(&vlan->vlan_ipv6, |
| &ifa->addr); |
| return NOTIFY_OK; |
| case NETDEV_DOWN: |
| if (ipv6_addr_equal(&vlan->vlan_ipv6, |
| &ifa->addr)) |
| bond_glean_dev_ipv6(vlan_dev, |
| &vlan->vlan_ipv6); |
| return NOTIFY_OK; |
| default: |
| return NOTIFY_DONE; |
| } |
| } |
| } |
| } |
| return NOTIFY_DONE; |
| } |
| |
| static struct notifier_block bond_inet6addr_notifier = { |
| .notifier_call = bond_inet6addr_event, |
| }; |
| |
| void bond_register_ipv6_notifier(void) |
| { |
| register_inet6addr_notifier(&bond_inet6addr_notifier); |
| } |
| |
| void bond_unregister_ipv6_notifier(void) |
| { |
| unregister_inet6addr_notifier(&bond_inet6addr_notifier); |
| } |
| |
