net: usb: raw-ip: support more rmnet interfaces
[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 pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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 <net/netns/generic.h>
31 #include "bonding.h"
32
33 /*
34  * Assign bond->master_ipv6 to the next IPv6 address in the list, or
35  * zero it out if there are none.
36  */
37 static void bond_glean_dev_ipv6(struct net_device *dev, struct in6_addr *addr)
38 {
39         struct inet6_dev *idev;
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         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);
54         } else
55                 ipv6_addr_set(addr, 0, 0, 0, 0);
56
57         read_unlock_bh(&idev->lock);
58
59         in6_dev_put(idev);
60 }
61
62 static void bond_na_send(struct net_device *slave_dev,
63                          struct in6_addr *daddr,
64                          int router,
65                          unsigned short vlan_id)
66 {
67         struct in6_addr mcaddr;
68         struct icmp6hdr icmp6h = {
69                 .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT,
70         };
71         struct sk_buff *skb;
72
73         icmp6h.icmp6_router = router;
74         icmp6h.icmp6_solicited = 0;
75         icmp6h.icmp6_override = 1;
76
77         addrconf_addr_solict_mult(daddr, &mcaddr);
78
79         pr_debug("ipv6 na on slave %s: dest %pI6, src %pI6\n",
80                  slave_dev->name, &mcaddr, daddr);
81
82         skb = ndisc_build_skb(slave_dev, &mcaddr, daddr, &icmp6h, daddr,
83                               ND_OPT_TARGET_LL_ADDR);
84
85         if (!skb) {
86                 pr_err("NA packet allocation failed\n");
87                 return;
88         }
89
90         if (vlan_id) {
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.
95                  */
96                 skb = __vlan_hwaccel_put_tag(skb, vlan_id);
97                 if (!skb) {
98                         pr_err("failed to insert VLAN tag\n");
99                         return;
100                 }
101         }
102
103         ndisc_send_skb(skb, slave_dev, NULL, &mcaddr, daddr, &icmp6h);
104 }
105
106 /*
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.
110  *
111  * Caller must hold curr_slave_lock for read or better
112  */
113 void bond_send_unsolicited_na(struct bonding *bond)
114 {
115         struct slave *slave = bond->curr_active_slave;
116         struct vlan_entry *vlan;
117         struct inet6_dev *idev;
118         int is_router;
119
120         pr_debug("%s: bond %s slave %s\n", bond->dev->name,
121                  __func__, slave ? slave->dev->name : "NULL");
122
123         if (!slave || !bond->send_unsol_na ||
124             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
125                 return;
126
127         bond->send_unsol_na--;
128
129         idev = in6_dev_get(bond->dev);
130         if (!idev)
131                 return;
132
133         is_router = !!idev->cnf.forwarding;
134
135         in6_dev_put(idev);
136
137         if (!ipv6_addr_any(&bond->master_ipv6))
138                 bond_na_send(slave->dev, &bond->master_ipv6, is_router, 0);
139
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,
143                                      vlan->vlan_id);
144                 }
145         }
146 }
147
148 /*
149  * bond_inet6addr_event: handle inet6addr notifier chain events.
150  *
151  * We keep track of device IPv6 addresses primarily to use as source
152  * addresses in NS probes.
153  *
154  * We track one IPv6 for the main device (if it has one).
155  */
156 static int bond_inet6addr_event(struct notifier_block *this,
157                                 unsigned long event,
158                                 void *ptr)
159 {
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);
165
166         list_for_each_entry(bond, &bn->dev_list, bond_list) {
167                 if (bond->dev == event_dev) {
168                         switch (event) {
169                         case NETDEV_UP:
170                                 if (ipv6_addr_any(&bond->master_ipv6))
171                                         ipv6_addr_copy(&bond->master_ipv6,
172                                                        &ifa->addr);
173                                 return NOTIFY_OK;
174                         case NETDEV_DOWN:
175                                 if (ipv6_addr_equal(&bond->master_ipv6,
176                                                     &ifa->addr))
177                                         bond_glean_dev_ipv6(bond->dev,
178                                                             &bond->master_ipv6);
179                                 return NOTIFY_OK;
180                         default:
181                                 return NOTIFY_DONE;
182                         }
183                 }
184
185                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
186                         rcu_read_lock();
187                         vlan_dev = __vlan_find_dev_deep(bond->dev,
188                                                         vlan->vlan_id);
189                         rcu_read_unlock();
190                         if (vlan_dev == event_dev) {
191                                 switch (event) {
192                                 case NETDEV_UP:
193                                         if (ipv6_addr_any(&vlan->vlan_ipv6))
194                                                 ipv6_addr_copy(&vlan->vlan_ipv6,
195                                                                &ifa->addr);
196                                         return NOTIFY_OK;
197                                 case NETDEV_DOWN:
198                                         if (ipv6_addr_equal(&vlan->vlan_ipv6,
199                                                             &ifa->addr))
200                                                 bond_glean_dev_ipv6(vlan_dev,
201                                                                     &vlan->vlan_ipv6);
202                                         return NOTIFY_OK;
203                                 default:
204                                         return NOTIFY_DONE;
205                                 }
206                         }
207                 }
208         }
209         return NOTIFY_DONE;
210 }
211
212 static struct notifier_block bond_inet6addr_notifier = {
213         .notifier_call = bond_inet6addr_event,
214 };
215
216 void bond_register_ipv6_notifier(void)
217 {
218         register_inet6addr_notifier(&bond_inet6addr_notifier);
219 }
220
221 void bond_unregister_ipv6_notifier(void)
222 {
223         unregister_inet6addr_notifier(&bond_inet6addr_notifier);
224 }
225