sfc: Don't use enums as a bitmask.
[zen-stable.git] / drivers / net / bonding / bond_ipv6.c
blob84fbd4ebd778d472a9cf115cfc4faaf72e92939e
1 /*
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
12 * for more details.
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>
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"
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;
41 if (!dev)
42 return;
44 idev = in6_dev_get(dev);
45 if (!idev)
46 return;
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);
57 read_unlock_bh(&idev->lock);
59 in6_dev_put(idev);
62 static void bond_na_send(struct net_device *slave_dev,
63 struct in6_addr *daddr,
64 int router,
65 unsigned short vlan_id)
67 struct in6_addr mcaddr;
68 struct icmp6hdr icmp6h = {
69 .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT,
71 struct sk_buff *skb;
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);
85 if (!skb) {
86 pr_err("NA packet allocation failed\n");
87 return;
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.
96 skb = __vlan_hwaccel_put_tag(skb, vlan_id);
97 if (!skb) {
98 pr_err("failed to insert VLAN tag\n");
99 return;
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;
118 int is_router;
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))
125 return;
127 bond->send_unsol_na--;
129 idev = in6_dev_get(bond->dev);
130 if (!idev)
131 return;
133 is_router = !!idev->cnf.forwarding;
135 in6_dev_put(idev);
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,
143 vlan->vlan_id);
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,
157 unsigned long event,
158 void *ptr)
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) {
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;
185 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
186 if (!bond->vlgrp)
187 continue;
188 vlan_dev = vlan_group_get_device(bond->vlgrp,
189 vlan->vlan_id);
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;
209 return NOTIFY_DONE;
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);