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| 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->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 | + |
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