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305d552a BH |
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 | ||
305d552a BH |
23 | #include <linux/types.h> |
24 | #include <linux/if_vlan.h> | |
25 | #include <net/ipv6.h> | |
26 | #include <net/ndisc.h> | |
27 | #include <net/addrconf.h> | |
28 | #include "bonding.h" | |
29 | ||
30 | /* | |
31 | * Assign bond->master_ipv6 to the next IPv6 address in the list, or | |
32 | * zero it out if there are none. | |
33 | */ | |
34 | static void bond_glean_dev_ipv6(struct net_device *dev, struct in6_addr *addr) | |
35 | { | |
36 | struct inet6_dev *idev; | |
37 | struct inet6_ifaddr *ifa; | |
38 | ||
39 | if (!dev) | |
40 | return; | |
41 | ||
42 | idev = in6_dev_get(dev); | |
43 | if (!idev) | |
44 | return; | |
45 | ||
46 | read_lock_bh(&idev->lock); | |
47 | ifa = idev->addr_list; | |
48 | if (ifa) | |
49 | ipv6_addr_copy(addr, &ifa->addr); | |
50 | else | |
51 | ipv6_addr_set(addr, 0, 0, 0, 0); | |
52 | ||
53 | read_unlock_bh(&idev->lock); | |
54 | ||
55 | in6_dev_put(idev); | |
56 | } | |
57 | ||
58 | static void bond_na_send(struct net_device *slave_dev, | |
59 | struct in6_addr *daddr, | |
60 | int router, | |
61 | unsigned short vlan_id) | |
62 | { | |
63 | struct in6_addr mcaddr; | |
64 | struct icmp6hdr icmp6h = { | |
65 | .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT, | |
66 | }; | |
67 | struct sk_buff *skb; | |
68 | ||
69 | icmp6h.icmp6_router = router; | |
70 | icmp6h.icmp6_solicited = 0; | |
71 | icmp6h.icmp6_override = 1; | |
72 | ||
73 | addrconf_addr_solict_mult(daddr, &mcaddr); | |
74 | ||
5a03cdb7 | 75 | pr_debug("ipv6 na on slave %s: dest %pI6, src %pI6\n", |
ef65583d | 76 | slave_dev->name, &mcaddr, daddr); |
305d552a BH |
77 | |
78 | skb = ndisc_build_skb(slave_dev, &mcaddr, daddr, &icmp6h, daddr, | |
79 | ND_OPT_TARGET_LL_ADDR); | |
80 | ||
81 | if (!skb) { | |
e5e2a8fd | 82 | pr_err(DRV_NAME ": NA packet allocation failed\n"); |
305d552a BH |
83 | return; |
84 | } | |
85 | ||
86 | if (vlan_id) { | |
87 | skb = vlan_put_tag(skb, vlan_id); | |
88 | if (!skb) { | |
e5e2a8fd | 89 | pr_err(DRV_NAME ": failed to insert VLAN tag\n"); |
305d552a BH |
90 | return; |
91 | } | |
92 | } | |
93 | ||
94 | ndisc_send_skb(skb, slave_dev, NULL, &mcaddr, daddr, &icmp6h); | |
95 | } | |
96 | ||
97 | /* | |
98 | * Kick out an unsolicited Neighbor Advertisement for an IPv6 address on | |
99 | * the bonding master. This will help the switch learn our address | |
100 | * if in active-backup mode. | |
101 | * | |
102 | * Caller must hold curr_slave_lock for read or better | |
103 | */ | |
104 | void bond_send_unsolicited_na(struct bonding *bond) | |
105 | { | |
106 | struct slave *slave = bond->curr_active_slave; | |
107 | struct vlan_entry *vlan; | |
108 | struct inet6_dev *idev; | |
109 | int is_router; | |
110 | ||
5a03cdb7 | 111 | pr_debug("bond_send_unsol_na: bond %s slave %s\n", bond->dev->name, |
305d552a BH |
112 | slave ? slave->dev->name : "NULL"); |
113 | ||
114 | if (!slave || !bond->send_unsol_na || | |
115 | test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) | |
116 | return; | |
117 | ||
118 | bond->send_unsol_na--; | |
119 | ||
120 | idev = in6_dev_get(bond->dev); | |
121 | if (!idev) | |
122 | return; | |
123 | ||
124 | is_router = !!idev->cnf.forwarding; | |
125 | ||
126 | in6_dev_put(idev); | |
127 | ||
128 | if (!ipv6_addr_any(&bond->master_ipv6)) | |
129 | bond_na_send(slave->dev, &bond->master_ipv6, is_router, 0); | |
130 | ||
131 | list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { | |
132 | if (!ipv6_addr_any(&vlan->vlan_ipv6)) { | |
133 | bond_na_send(slave->dev, &vlan->vlan_ipv6, is_router, | |
134 | vlan->vlan_id); | |
135 | } | |
136 | } | |
137 | } | |
138 | ||
139 | /* | |
140 | * bond_inet6addr_event: handle inet6addr notifier chain events. | |
141 | * | |
142 | * We keep track of device IPv6 addresses primarily to use as source | |
143 | * addresses in NS probes. | |
144 | * | |
145 | * We track one IPv6 for the main device (if it has one). | |
146 | */ | |
147 | static int bond_inet6addr_event(struct notifier_block *this, | |
148 | unsigned long event, | |
149 | void *ptr) | |
150 | { | |
151 | struct inet6_ifaddr *ifa = ptr; | |
152 | struct net_device *vlan_dev, *event_dev = ifa->idev->dev; | |
153 | struct bonding *bond; | |
154 | struct vlan_entry *vlan; | |
155 | ||
156 | if (dev_net(event_dev) != &init_net) | |
157 | return NOTIFY_DONE; | |
158 | ||
159 | list_for_each_entry(bond, &bond_dev_list, bond_list) { | |
160 | if (bond->dev == event_dev) { | |
161 | switch (event) { | |
162 | case NETDEV_UP: | |
163 | if (ipv6_addr_any(&bond->master_ipv6)) | |
164 | ipv6_addr_copy(&bond->master_ipv6, | |
165 | &ifa->addr); | |
166 | return NOTIFY_OK; | |
167 | case NETDEV_DOWN: | |
168 | if (ipv6_addr_equal(&bond->master_ipv6, | |
169 | &ifa->addr)) | |
170 | bond_glean_dev_ipv6(bond->dev, | |
171 | &bond->master_ipv6); | |
172 | return NOTIFY_OK; | |
173 | default: | |
174 | return NOTIFY_DONE; | |
175 | } | |
176 | } | |
177 | ||
178 | list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { | |
179 | vlan_dev = vlan_group_get_device(bond->vlgrp, | |
180 | vlan->vlan_id); | |
181 | if (vlan_dev == event_dev) { | |
182 | switch (event) { | |
183 | case NETDEV_UP: | |
184 | if (ipv6_addr_any(&vlan->vlan_ipv6)) | |
185 | ipv6_addr_copy(&vlan->vlan_ipv6, | |
186 | &ifa->addr); | |
187 | return NOTIFY_OK; | |
188 | case NETDEV_DOWN: | |
189 | if (ipv6_addr_equal(&vlan->vlan_ipv6, | |
190 | &ifa->addr)) | |
191 | bond_glean_dev_ipv6(vlan_dev, | |
192 | &vlan->vlan_ipv6); | |
193 | return NOTIFY_OK; | |
194 | default: | |
195 | return NOTIFY_DONE; | |
196 | } | |
197 | } | |
198 | } | |
199 | } | |
200 | return NOTIFY_DONE; | |
201 | } | |
202 | ||
203 | static struct notifier_block bond_inet6addr_notifier = { | |
204 | .notifier_call = bond_inet6addr_event, | |
205 | }; | |
206 | ||
207 | void bond_register_ipv6_notifier(void) | |
208 | { | |
209 | register_inet6addr_notifier(&bond_inet6addr_notifier); | |
210 | } | |
211 | ||
212 | void bond_unregister_ipv6_notifier(void) | |
213 | { | |
214 | unregister_inet6addr_notifier(&bond_inet6addr_notifier); | |
215 | } | |
216 |