1 files changed, 216 insertions, 0 deletions

diff --git a/drivers/net/bonding/bond_ipv6.c b/drivers/net/bonding/bond_ipv6.c
new file mode 100644
index 000000000000..0d73bf5ac5a5
--- /dev/null
+++ b/drivers/net/bonding/bond_ipv6.c
@@ -0,0 +1,216 @@
+/*
+ * Copyright(c) 2008 Hewlett-Packard Development Company, L.P.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * The full GNU General Public License is included in this distribution in the
+ * file called LICENSE.
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/if_vlan.h>
+#include <net/ipv6.h>
+#include <net/ndisc.h>
+#include <net/addrconf.h>
+#include "bonding.h"
+
+/*
+ * Assign bond->master_ipv6 to the next IPv6 address in the list, or
+ * zero it out if there are none.
+ */
+static void bond_glean_dev_ipv6(struct net_device *dev, struct in6_addr *addr)
+{
+        struct inet6_dev *idev;
+        struct inet6_ifaddr *ifa;
+
+        if (!dev)
+                return;
+
+        idev = in6_dev_get(dev);
+        if (!idev)
+                return;
+
+        read_lock_bh(&idev->lock);
+        ifa = idev->addr_list;
+        if (ifa)
+                ipv6_addr_copy(addr, &ifa->addr);
+        else
+                ipv6_addr_set(addr, 0, 0, 0, 0);
+
+        read_unlock_bh(&idev->lock);
+
+        in6_dev_put(idev);
+}
+
+static void bond_na_send(struct net_device *slave_dev,
+                         struct in6_addr *daddr,
+                         int router,
+                         unsigned short vlan_id)
+{
+        struct in6_addr mcaddr;
+        struct icmp6hdr icmp6h = {
+                .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT,
+        };
+        struct sk_buff *skb;
+
+        icmp6h.icmp6_router = router;
+        icmp6h.icmp6_solicited = 0;
+        icmp6h.icmp6_override = 1;
+
+        addrconf_addr_solict_mult(daddr, &mcaddr);
+
+        pr_debug("ipv6 na on slave %s: dest %pI6, src %pI6\n",
+               slave_dev->name, &mcaddr, daddr);
+
+        skb = ndisc_build_skb(slave_dev, &mcaddr, daddr, &icmp6h, daddr,
+                              ND_OPT_TARGET_LL_ADDR);
+
+        if (!skb) {
+                printk(KERN_ERR DRV_NAME ": NA packet allocation failed\n");
+                return;
+        }
+
+        if (vlan_id) {
+                skb = vlan_put_tag(skb, vlan_id);
+                if (!skb) {
+                        printk(KERN_ERR DRV_NAME ": failed to insert VLAN tag\n");
+                        return;
+                }
+        }
+
+        ndisc_send_skb(skb, slave_dev, NULL, &mcaddr, daddr, &icmp6h);
+}
+
+/*
+ * Kick out an unsolicited Neighbor Advertisement for an IPv6 address on
+ * the bonding master.  This will help the switch learn our address
+ * if in active-backup mode.
+ *
+ * Caller must hold curr_slave_lock for read or better
+ */
+void bond_send_unsolicited_na(struct bonding *bond)
+{
+        struct slave *slave = bond->curr_active_slave;
+        struct vlan_entry *vlan;
+        struct inet6_dev *idev;
+        int is_router;
+
+        pr_debug("bond_send_unsol_na: bond %s slave %s\n", bond->dev->name,
+                                slave ? slave->dev->name : "NULL");
+
+        if (!slave || !bond->send_unsol_na ||
+            test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
+                return;
+
+        bond->send_unsol_na--;
+
+        idev = in6_dev_get(bond->dev);
+        if (!idev)
+                return;
+
+        is_router = !!idev->cnf.forwarding;
+
+        in6_dev_put(idev);
+
+        if (!ipv6_addr_any(&bond->master_ipv6))
+                bond_na_send(slave->dev, &bond->master_ipv6, is_router, 0);
+
+        list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
+                if (!ipv6_addr_any(&vlan->vlan_ipv6)) {
+                        bond_na_send(slave->dev, &vlan->vlan_ipv6, is_router,
+                                     vlan->vlan_id);
+                }
+        }
+}
+
+/*
+ * bond_inet6addr_event: handle inet6addr notifier chain events.
+ *
+ * We keep track of device IPv6 addresses primarily to use as source
+ * addresses in NS probes.
+ *
+ * We track one IPv6 for the main device (if it has one).
+ */
+static int bond_inet6addr_event(struct notifier_block *this,
+                                unsigned long event,
+                                void *ptr)
+{
+        struct inet6_ifaddr *ifa = ptr;
+        struct net_device *vlan_dev, *event_dev = ifa->idev->dev;
+        struct bonding *bond;
+        struct vlan_entry *vlan;
+
+        if (dev_net(event_dev) != &init_net)
+                return NOTIFY_DONE;
+
+        list_for_each_entry(bond, &bond_dev_list, bond_list) {
+                if (bond->dev == event_dev) {
+                        switch (event) {
+                        case NETDEV_UP:
+                                if (ipv6_addr_any(&bond->master_ipv6))
+                                        ipv6_addr_copy(&bond->master_ipv6,
+                                                       &ifa->addr);
+                                return NOTIFY_OK;
+                        case NETDEV_DOWN:
+                                if (ipv6_addr_equal(&bond->master_ipv6,
+                                                    &ifa->addr))
+                                        bond_glean_dev_ipv6(bond->dev,
+                                                            &bond->master_ipv6);
+                                return NOTIFY_OK;
+                        default:
+                                return NOTIFY_DONE;
+                        }
+                }
+
+                list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
+                        vlan_dev = vlan_group_get_device(bond->vlgrp,
+                                                         vlan->vlan_id);
+                        if (vlan_dev == event_dev) {
+                                switch (event) {
+                                case NETDEV_UP:
+                                        if (ipv6_addr_any(&vlan->vlan_ipv6))
+                                                ipv6_addr_copy(&vlan->vlan_ipv6,
+                                                               &ifa->addr);
+                                        return NOTIFY_OK;
+                                case NETDEV_DOWN:
+                                        if (ipv6_addr_equal(&vlan->vlan_ipv6,
+                                                            &ifa->addr))
+                                                bond_glean_dev_ipv6(vlan_dev,
+                                                                    &vlan->vlan_ipv6);
+                                        return NOTIFY_OK;
+                                default:
+                                        return NOTIFY_DONE;
+                                }
+                        }
+                }
+        }
+        return NOTIFY_DONE;
+}
+
+static struct notifier_block bond_inet6addr_notifier = {
+        .notifier_call = bond_inet6addr_event,
+};
+
+void bond_register_ipv6_notifier(void)
+{
+        register_inet6addr_notifier(&bond_inet6addr_notifier);
+}
+
+void bond_unregister_ipv6_notifier(void)
+{
+        unregister_inet6addr_notifier(&bond_inet6addr_notifier);
+}
+