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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 | ||
a4aee5c8 JP |
23 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
24 | ||
305d552a BH |
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> | |
ec87fd3b | 30 | #include <net/netns/generic.h> |
305d552a BH |
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; | |
305d552a BH |
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); | |
502a2ffd | 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); | |
305d552a | 53 | ipv6_addr_copy(addr, &ifa->addr); |
502a2ffd | 54 | } else |
305d552a BH |
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 | ||
5a03cdb7 | 79 | pr_debug("ipv6 na on slave %s: dest %pI6, src %pI6\n", |
a4aee5c8 | 80 | slave_dev->name, &mcaddr, daddr); |
305d552a BH |
81 | |
82 | skb = ndisc_build_skb(slave_dev, &mcaddr, daddr, &icmp6h, daddr, | |
83 | ND_OPT_TARGET_LL_ADDR); | |
84 | ||
85 | if (!skb) { | |
a4aee5c8 | 86 | pr_err("NA packet allocation failed\n"); |
305d552a BH |
87 | return; |
88 | } | |
89 | ||
90 | if (vlan_id) { | |
f88a4a9b BH |
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); | |
305d552a | 97 | if (!skb) { |
a4aee5c8 | 98 | pr_err("failed to insert VLAN tag\n"); |
305d552a BH |
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 | ||
a4aee5c8 JP |
120 | pr_debug("%s: bond %s slave %s\n", bond->dev->name, |
121 | __func__, slave ? slave->dev->name : "NULL"); | |
305d552a BH |
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; | |
ec87fd3b | 164 | struct bond_net *bn = net_generic(dev_net(event_dev), bond_net_id); |
305d552a | 165 | |
ec87fd3b | 166 | list_for_each_entry(bond, &bn->dev_list, bond_list) { |
305d552a BH |
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) { | |
cc0e4070 JP |
186 | rcu_read_lock(); |
187 | vlan_dev = __vlan_find_dev_deep(bond->dev, | |
188 | vlan->vlan_id); | |
189 | rcu_read_unlock(); | |
305d552a BH |
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 |