bonding: fix compile error if debug enabled
[linux-2.6.git] / drivers / net / bonding / bond_ipv6.c
1 /*
2  * Copyright(c) 2008 Hewlett-Packard Development Company, L.P.
3  *
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.
8  *
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
12  * for more details.
13  *
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.
17  *
18  * The full GNU General Public License is included in this distribution in the
19  * file called LICENSE.
20  *
21  */
22
23 //#define BONDING_DEBUG 1
24
25 #include <linux/types.h>
26 #include <linux/if_vlan.h>
27 #include <net/ipv6.h>
28 #include <net/ndisc.h>
29 #include <net/addrconf.h>
30 #include "bonding.h"
31
32 /*
33  * Assign bond->master_ipv6 to the next IPv6 address in the list, or
34  * zero it out if there are none.
35  */
36 static void bond_glean_dev_ipv6(struct net_device *dev, struct in6_addr *addr)
37 {
38         struct inet6_dev *idev;
39         struct inet6_ifaddr *ifa;
40
41         if (!dev)
42                 return;
43
44         idev = in6_dev_get(dev);
45         if (!idev)
46                 return;
47
48         read_lock_bh(&idev->lock);
49         ifa = idev->addr_list;
50         if (ifa)
51                 ipv6_addr_copy(addr, &ifa->addr);
52         else
53                 ipv6_addr_set(addr, 0, 0, 0, 0);
54
55         read_unlock_bh(&idev->lock);
56
57         in6_dev_put(idev);
58 }
59
60 static void bond_na_send(struct net_device *slave_dev,
61                          struct in6_addr *daddr,
62                          int router,
63                          unsigned short vlan_id)
64 {
65         struct in6_addr mcaddr;
66         struct icmp6hdr icmp6h = {
67                 .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT,
68         };
69         struct sk_buff *skb;
70
71         icmp6h.icmp6_router = router;
72         icmp6h.icmp6_solicited = 0;
73         icmp6h.icmp6_override = 1;
74
75         addrconf_addr_solict_mult(daddr, &mcaddr);
76
77         dprintk("ipv6 na on slave %s: dest %pI6, src %pI6\n",
78                slave_dev->name, &mcaddr, daddr);
79
80         skb = ndisc_build_skb(slave_dev, &mcaddr, daddr, &icmp6h, daddr,
81                               ND_OPT_TARGET_LL_ADDR);
82
83         if (!skb) {
84                 printk(KERN_ERR DRV_NAME ": NA packet allocation failed\n");
85                 return;
86         }
87
88         if (vlan_id) {
89                 skb = vlan_put_tag(skb, vlan_id);
90                 if (!skb) {
91                         printk(KERN_ERR DRV_NAME ": failed to insert VLAN tag\n");
92                         return;
93                 }
94         }
95
96         ndisc_send_skb(skb, slave_dev, NULL, &mcaddr, daddr, &icmp6h);
97 }
98
99 /*
100  * Kick out an unsolicited Neighbor Advertisement for an IPv6 address on
101  * the bonding master.  This will help the switch learn our address
102  * if in active-backup mode.
103  *
104  * Caller must hold curr_slave_lock for read or better
105  */
106 void bond_send_unsolicited_na(struct bonding *bond)
107 {
108         struct slave *slave = bond->curr_active_slave;
109         struct vlan_entry *vlan;
110         struct inet6_dev *idev;
111         int is_router;
112
113         dprintk("bond_send_unsol_na: bond %s slave %s\n", bond->dev->name,
114                                 slave ? slave->dev->name : "NULL");
115
116         if (!slave || !bond->send_unsol_na ||
117             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
118                 return;
119
120         bond->send_unsol_na--;
121
122         idev = in6_dev_get(bond->dev);
123         if (!idev)
124                 return;
125
126         is_router = !!idev->cnf.forwarding;
127
128         in6_dev_put(idev);
129
130         if (!ipv6_addr_any(&bond->master_ipv6))
131                 bond_na_send(slave->dev, &bond->master_ipv6, is_router, 0);
132
133         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
134                 if (!ipv6_addr_any(&vlan->vlan_ipv6)) {
135                         bond_na_send(slave->dev, &vlan->vlan_ipv6, is_router,
136                                      vlan->vlan_id);
137                 }
138         }
139 }
140
141 /*
142  * bond_inet6addr_event: handle inet6addr notifier chain events.
143  *
144  * We keep track of device IPv6 addresses primarily to use as source
145  * addresses in NS probes.
146  *
147  * We track one IPv6 for the main device (if it has one).
148  */
149 static int bond_inet6addr_event(struct notifier_block *this,
150                                 unsigned long event,
151                                 void *ptr)
152 {
153         struct inet6_ifaddr *ifa = ptr;
154         struct net_device *vlan_dev, *event_dev = ifa->idev->dev;
155         struct bonding *bond;
156         struct vlan_entry *vlan;
157
158         if (dev_net(event_dev) != &init_net)
159                 return NOTIFY_DONE;
160
161         list_for_each_entry(bond, &bond_dev_list, bond_list) {
162                 if (bond->dev == event_dev) {
163                         switch (event) {
164                         case NETDEV_UP:
165                                 if (ipv6_addr_any(&bond->master_ipv6))
166                                         ipv6_addr_copy(&bond->master_ipv6,
167                                                        &ifa->addr);
168                                 return NOTIFY_OK;
169                         case NETDEV_DOWN:
170                                 if (ipv6_addr_equal(&bond->master_ipv6,
171                                                     &ifa->addr))
172                                         bond_glean_dev_ipv6(bond->dev,
173                                                             &bond->master_ipv6);
174                                 return NOTIFY_OK;
175                         default:
176                                 return NOTIFY_DONE;
177                         }
178                 }
179
180                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
181                         vlan_dev = vlan_group_get_device(bond->vlgrp,
182                                                          vlan->vlan_id);
183                         if (vlan_dev == event_dev) {
184                                 switch (event) {
185                                 case NETDEV_UP:
186                                         if (ipv6_addr_any(&vlan->vlan_ipv6))
187                                                 ipv6_addr_copy(&vlan->vlan_ipv6,
188                                                                &ifa->addr);
189                                         return NOTIFY_OK;
190                                 case NETDEV_DOWN:
191                                         if (ipv6_addr_equal(&vlan->vlan_ipv6,
192                                                             &ifa->addr))
193                                                 bond_glean_dev_ipv6(vlan_dev,
194                                                                     &vlan->vlan_ipv6);
195                                         return NOTIFY_OK;
196                                 default:
197                                         return NOTIFY_DONE;
198                                 }
199                         }
200                 }
201         }
202         return NOTIFY_DONE;
203 }
204
205 static struct notifier_block bond_inet6addr_notifier = {
206         .notifier_call = bond_inet6addr_event,
207 };
208
209 void bond_register_ipv6_notifier(void)
210 {
211         register_inet6addr_notifier(&bond_inet6addr_notifier);
212 }
213
214 void bond_unregister_ipv6_notifier(void)
215 {
216         unregister_inet6addr_notifier(&bond_inet6addr_notifier);
217 }
218