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 */ 37static 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 62static 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 skb = vlan_put_tag(skb, vlan_id); 92 if (!skb) { 93 pr_err("failed to insert VLAN tag\n"); 94 return; 95 } 96 } 97 98 ndisc_send_skb(skb, slave_dev, NULL, &mcaddr, daddr, &icmp6h); 99} 100 101/* 102 * Kick out an unsolicited Neighbor Advertisement for an IPv6 address on 103 * the bonding master. This will help the switch learn our address 104 * if in active-backup mode. 105 * 106 * Caller must hold curr_slave_lock for read or better 107 */ 108void bond_send_unsolicited_na(struct bonding *bond) 109{ 110 struct slave *slave = bond->curr_active_slave; 111 struct vlan_entry *vlan; 112 struct inet6_dev *idev; 113 int is_router; 114 115 pr_debug("%s: bond %s slave %s\n", bond->dev->name, 116 __func__, slave ? slave->dev->name : "NULL"); 117 118 if (!slave || !bond->send_unsol_na || 119 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) 120 return; 121 122 bond->send_unsol_na--; 123 124 idev = in6_dev_get(bond->dev); 125 if (!idev) 126 return; 127 128 is_router = !!idev->cnf.forwarding; 129 130 in6_dev_put(idev); 131 132 if (!ipv6_addr_any(&bond->master_ipv6)) 133 bond_na_send(slave->dev, &bond->master_ipv6, is_router, 0); 134 135 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 136 if (!ipv6_addr_any(&vlan->vlan_ipv6)) { 137 bond_na_send(slave->dev, &vlan->vlan_ipv6, is_router, 138 vlan->vlan_id); 139 } 140 } 141} 142 143/* 144 * bond_inet6addr_event: handle inet6addr notifier chain events. 145 * 146 * We keep track of device IPv6 addresses primarily to use as source 147 * addresses in NS probes. 148 * 149 * We track one IPv6 for the main device (if it has one). 150 */ 151static int bond_inet6addr_event(struct notifier_block *this, 152 unsigned long event, 153 void *ptr) 154{ 155 struct inet6_ifaddr *ifa = ptr; 156 struct net_device *vlan_dev, *event_dev = ifa->idev->dev; 157 struct bonding *bond; 158 struct vlan_entry *vlan; 159 struct bond_net *bn = net_generic(dev_net(event_dev), bond_net_id); 160 161 list_for_each_entry(bond, &bn->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 if (!bond->vlgrp) 182 continue; 183 vlan_dev = vlan_group_get_device(bond->vlgrp, 184 vlan->vlan_id); 185 if (vlan_dev == event_dev) { 186 switch (event) { 187 case NETDEV_UP: 188 if (ipv6_addr_any(&vlan->vlan_ipv6)) 189 ipv6_addr_copy(&vlan->vlan_ipv6, 190 &ifa->addr); 191 return NOTIFY_OK; 192 case NETDEV_DOWN: 193 if (ipv6_addr_equal(&vlan->vlan_ipv6, 194 &ifa->addr)) 195 bond_glean_dev_ipv6(vlan_dev, 196 &vlan->vlan_ipv6); 197 return NOTIFY_OK; 198 default: 199 return NOTIFY_DONE; 200 } 201 } 202 } 203 } 204 return NOTIFY_DONE; 205} 206 207static struct notifier_block bond_inet6addr_notifier = { 208 .notifier_call = bond_inet6addr_event, 209}; 210 211void bond_register_ipv6_notifier(void) 212{ 213 register_inet6addr_notifier(&bond_inet6addr_notifier); 214} 215 216void bond_unregister_ipv6_notifier(void) 217{ 218 unregister_inet6addr_notifier(&bond_inet6addr_notifier); 219} 220