2 * Copyright(c) 2008 Hewlett-Packard Development Company, L.P.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
25 #include <linux/types.h>
26 #include <linux/if_vlan.h>
28 #include <net/ndisc.h>
29 #include <net/addrconf.h>
30 #include <net/netns/generic.h>
34 * Assign bond->master_ipv6 to the next IPv6 address in the list, or
35 * zero it out if there are none.
37 static void bond_glean_dev_ipv6(struct net_device *dev, struct in6_addr *addr)
39 struct inet6_dev *idev;
40 struct inet6_ifaddr *ifa;
45 idev = in6_dev_get(dev);
49 read_lock_bh(&idev->lock);
50 ifa = idev->addr_list;
52 ipv6_addr_copy(addr, &ifa->addr);
54 ipv6_addr_set(addr, 0, 0, 0, 0);
56 read_unlock_bh(&idev->lock);
61 static void bond_na_send(struct net_device *slave_dev,
62 struct in6_addr *daddr,
64 unsigned short vlan_id)
66 struct in6_addr mcaddr;
67 struct icmp6hdr icmp6h = {
68 .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT,
72 icmp6h.icmp6_router = router;
73 icmp6h.icmp6_solicited = 0;
74 icmp6h.icmp6_override = 1;
76 addrconf_addr_solict_mult(daddr, &mcaddr);
78 pr_debug("ipv6 na on slave %s: dest %pI6, src %pI6\n",
79 slave_dev->name, &mcaddr, daddr);
81 skb = ndisc_build_skb(slave_dev, &mcaddr, daddr, &icmp6h, daddr,
82 ND_OPT_TARGET_LL_ADDR);
85 pr_err("NA packet allocation failed\n");
90 skb = vlan_put_tag(skb, vlan_id);
92 pr_err("failed to insert VLAN tag\n");
97 ndisc_send_skb(skb, slave_dev, NULL, &mcaddr, daddr, &icmp6h);
101 * Kick out an unsolicited Neighbor Advertisement for an IPv6 address on
102 * the bonding master. This will help the switch learn our address
103 * if in active-backup mode.
105 * Caller must hold curr_slave_lock for read or better
107 void bond_send_unsolicited_na(struct bonding *bond)
109 struct slave *slave = bond->curr_active_slave;
110 struct vlan_entry *vlan;
111 struct inet6_dev *idev;
114 pr_debug("%s: bond %s slave %s\n", bond->dev->name,
115 __func__, slave ? slave->dev->name : "NULL");
117 if (!slave || !bond->send_unsol_na ||
118 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
121 bond->send_unsol_na--;
123 idev = in6_dev_get(bond->dev);
127 is_router = !!idev->cnf.forwarding;
131 if (!ipv6_addr_any(&bond->master_ipv6))
132 bond_na_send(slave->dev, &bond->master_ipv6, is_router, 0);
134 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
135 if (!ipv6_addr_any(&vlan->vlan_ipv6)) {
136 bond_na_send(slave->dev, &vlan->vlan_ipv6, is_router,
143 * bond_inet6addr_event: handle inet6addr notifier chain events.
145 * We keep track of device IPv6 addresses primarily to use as source
146 * addresses in NS probes.
148 * We track one IPv6 for the main device (if it has one).
150 static int bond_inet6addr_event(struct notifier_block *this,
154 struct inet6_ifaddr *ifa = ptr;
155 struct net_device *vlan_dev, *event_dev = ifa->idev->dev;
156 struct bonding *bond;
157 struct vlan_entry *vlan;
158 struct bond_net *bn = net_generic(dev_net(event_dev), bond_net_id);
160 list_for_each_entry(bond, &bn->dev_list, bond_list) {
161 if (bond->dev == event_dev) {
164 if (ipv6_addr_any(&bond->master_ipv6))
165 ipv6_addr_copy(&bond->master_ipv6,
169 if (ipv6_addr_equal(&bond->master_ipv6,
171 bond_glean_dev_ipv6(bond->dev,
179 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
180 vlan_dev = vlan_group_get_device(bond->vlgrp,
182 if (vlan_dev == event_dev) {
185 if (ipv6_addr_any(&vlan->vlan_ipv6))
186 ipv6_addr_copy(&vlan->vlan_ipv6,
190 if (ipv6_addr_equal(&vlan->vlan_ipv6,
192 bond_glean_dev_ipv6(vlan_dev,
204 static struct notifier_block bond_inet6addr_notifier = {
205 .notifier_call = bond_inet6addr_event,
208 void bond_register_ipv6_notifier(void)
210 register_inet6addr_notifier(&bond_inet6addr_notifier);
213 void bond_unregister_ipv6_notifier(void)
215 unregister_inet6addr_notifier(&bond_inet6addr_notifier);