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
;
44 idev
= in6_dev_get(dev
);
48 read_lock_bh(&idev
->lock
);
49 if (!list_empty(&idev
->addr_list
)) {
50 struct inet6_ifaddr
*ifa
51 = list_first_entry(&idev
->addr_list
,
52 struct inet6_ifaddr
, if_list
);
53 ipv6_addr_copy(addr
, &ifa
->addr
);
55 ipv6_addr_set(addr
, 0, 0, 0, 0);
57 read_unlock_bh(&idev
->lock
);
62 static void bond_na_send(struct net_device
*slave_dev
,
63 struct in6_addr
*daddr
,
65 unsigned short vlan_id
)
67 struct in6_addr mcaddr
;
68 struct icmp6hdr icmp6h
= {
69 .icmp6_type
= NDISC_NEIGHBOUR_ADVERTISEMENT
,
73 icmp6h
.icmp6_router
= router
;
74 icmp6h
.icmp6_solicited
= 0;
75 icmp6h
.icmp6_override
= 1;
77 addrconf_addr_solict_mult(daddr
, &mcaddr
);
79 pr_debug("ipv6 na on slave %s: dest %pI6, src %pI6\n",
80 slave_dev
->name
, &mcaddr
, daddr
);
82 skb
= ndisc_build_skb(slave_dev
, &mcaddr
, daddr
, &icmp6h
, daddr
,
83 ND_OPT_TARGET_LL_ADDR
);
86 pr_err("NA packet allocation failed\n");
91 /* The Ethernet header is not present yet, so it is
92 * too early to insert a VLAN tag. Force use of an
93 * out-of-line tag here and let dev_hard_start_xmit()
94 * insert it if the slave hardware can't.
96 skb
= __vlan_hwaccel_put_tag(skb
, vlan_id
);
98 pr_err("failed to insert VLAN tag\n");
103 ndisc_send_skb(skb
, slave_dev
, NULL
, &mcaddr
, daddr
, &icmp6h
);
107 * Kick out an unsolicited Neighbor Advertisement for an IPv6 address on
108 * the bonding master. This will help the switch learn our address
109 * if in active-backup mode.
111 * Caller must hold curr_slave_lock for read or better
113 void bond_send_unsolicited_na(struct bonding
*bond
)
115 struct slave
*slave
= bond
->curr_active_slave
;
116 struct vlan_entry
*vlan
;
117 struct inet6_dev
*idev
;
120 pr_debug("%s: bond %s slave %s\n", bond
->dev
->name
,
121 __func__
, slave
? slave
->dev
->name
: "NULL");
123 if (!slave
|| !bond
->send_unsol_na
||
124 test_bit(__LINK_STATE_LINKWATCH_PENDING
, &slave
->dev
->state
))
127 bond
->send_unsol_na
--;
129 idev
= in6_dev_get(bond
->dev
);
133 is_router
= !!idev
->cnf
.forwarding
;
137 if (!ipv6_addr_any(&bond
->master_ipv6
))
138 bond_na_send(slave
->dev
, &bond
->master_ipv6
, is_router
, 0);
140 list_for_each_entry(vlan
, &bond
->vlan_list
, vlan_list
) {
141 if (!ipv6_addr_any(&vlan
->vlan_ipv6
)) {
142 bond_na_send(slave
->dev
, &vlan
->vlan_ipv6
, is_router
,
149 * bond_inet6addr_event: handle inet6addr notifier chain events.
151 * We keep track of device IPv6 addresses primarily to use as source
152 * addresses in NS probes.
154 * We track one IPv6 for the main device (if it has one).
156 static int bond_inet6addr_event(struct notifier_block
*this,
160 struct inet6_ifaddr
*ifa
= ptr
;
161 struct net_device
*vlan_dev
, *event_dev
= ifa
->idev
->dev
;
162 struct bonding
*bond
;
163 struct vlan_entry
*vlan
;
164 struct bond_net
*bn
= net_generic(dev_net(event_dev
), bond_net_id
);
166 list_for_each_entry(bond
, &bn
->dev_list
, bond_list
) {
167 if (bond
->dev
== event_dev
) {
170 if (ipv6_addr_any(&bond
->master_ipv6
))
171 ipv6_addr_copy(&bond
->master_ipv6
,
175 if (ipv6_addr_equal(&bond
->master_ipv6
,
177 bond_glean_dev_ipv6(bond
->dev
,
185 list_for_each_entry(vlan
, &bond
->vlan_list
, vlan_list
) {
188 vlan_dev
= vlan_group_get_device(bond
->vlgrp
,
190 if (vlan_dev
== event_dev
) {
193 if (ipv6_addr_any(&vlan
->vlan_ipv6
))
194 ipv6_addr_copy(&vlan
->vlan_ipv6
,
198 if (ipv6_addr_equal(&vlan
->vlan_ipv6
,
200 bond_glean_dev_ipv6(vlan_dev
,
212 static struct notifier_block bond_inet6addr_notifier
= {
213 .notifier_call
= bond_inet6addr_event
,
216 void bond_register_ipv6_notifier(void)
218 register_inet6addr_notifier(&bond_inet6addr_notifier
);
221 void bond_unregister_ipv6_notifier(void)
223 unregister_inet6addr_notifier(&bond_inet6addr_notifier
);