--- /dev/null
+/*
+ * IPv6 Address [auto]configuration
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
+ *
+ * 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.
+ */
+
+/*
+ * Changes:
+ *
+ * Janos Farkas : delete timer on ifdown
+ * <chexum@bankinf.banki.hu>
+ * Andi Kleen : kill double kfree on module
+ * unload.
+ * Maciej W. Rozycki : FDDI support
+ * sekiya@USAGI : Don't send too many RS
+ * packets.
+ * yoshfuji@USAGI : Fixed interval between DAD
+ * packets.
+ * YOSHIFUJI Hideaki @USAGI : improved accuracy of
+ * address validation timer.
+ * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
+ * support.
+ * Yuji SEKIYA @USAGI : Don't assign a same IPv6
+ * address on a same interface.
+ * YOSHIFUJI Hideaki @USAGI : ARCnet support
+ * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
+ * seq_file.
+ * YOSHIFUJI Hideaki @USAGI : improved source address
+ * selection; consider scope,
+ * status etc.
+ */
+
+#define pr_fmt(fmt) "IPv6: " fmt
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/inet.h>
+#include <linux/in6.h>
+#include <linux/netdevice.h>
+#include <linux/if_addr.h>
+#include <linux/if_arp.h>
+#include <linux/if_arcnet.h>
+#include <linux/if_infiniband.h>
+#include <linux/route.h>
+#include <linux/inetdevice.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#ifdef CONFIG_SYSCTL
+#include <linux/sysctl.h>
+#endif
+#include <linux/capability.h>
+#include <linux/delay.h>
+#include <linux/notifier.h>
+#include <linux/string.h>
+#include <linux/hash.h>
+
+#include <net/net_namespace.h>
+#include <net/sock.h>
+#include <net/snmp.h>
+
+#include <net/af_ieee802154.h>
+#include <net/firewire.h>
+#include <net/ipv6.h>
+#include <net/protocol.h>
+#include <net/ndisc.h>
+#include <net/ip6_route.h>
+#include <net/addrconf.h>
+#include <net/tcp.h>
+#include <net/ip.h>
+#include <net/netlink.h>
+#include <net/pkt_sched.h>
+#include <linux/if_tunnel.h>
+#include <linux/rtnetlink.h>
+#include <linux/netconf.h>
+#include <linux/random.h>
+#include <linux/uaccess.h>
+#include <asm/unaligned.h>
+
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/export.h>
+
+/* Set to 3 to get tracing... */
+#define ACONF_DEBUG 2
+
+#if ACONF_DEBUG >= 3
+#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
+#else
+#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
+#endif
+
+#define INFINITY_LIFE_TIME 0xFFFFFFFF
+
+#define IPV6_MAX_STRLEN \
+ sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
+
+static inline u32 cstamp_delta(unsigned long cstamp)
+{
+ return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
+}
+
+#ifdef CONFIG_SYSCTL
+static int addrconf_sysctl_register(struct inet6_dev *idev);
+static void addrconf_sysctl_unregister(struct inet6_dev *idev);
+#else
+static inline int addrconf_sysctl_register(struct inet6_dev *idev)
+{
+ return 0;
+}
+
+static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
+{
+}
+#endif
+
+static void __ipv6_regen_rndid(struct inet6_dev *idev);
+static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
+static void ipv6_regen_rndid(unsigned long data);
+
+static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
+static int ipv6_count_addresses(struct inet6_dev *idev);
+static int ipv6_generate_stable_address(struct in6_addr *addr,
+ u8 dad_count,
+ const struct inet6_dev *idev);
+
+/*
+ * Configured unicast address hash table
+ */
+static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
+static DEFINE_SPINLOCK(addrconf_hash_lock);
+
+static void addrconf_verify(void);
+static void addrconf_verify_rtnl(void);
+static void addrconf_verify_work(struct work_struct *);
+
+static struct workqueue_struct *addrconf_wq;
+static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
+
+static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
+static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
+
+static void addrconf_type_change(struct net_device *dev,
+ unsigned long event);
+static int addrconf_ifdown(struct net_device *dev, int how);
+
+static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
+ int plen,
+ const struct net_device *dev,
+ u32 flags, u32 noflags);
+
+static void addrconf_dad_start(struct inet6_ifaddr *ifp);
+static void addrconf_dad_work(struct work_struct *w);
+static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
+static void addrconf_dad_run(struct inet6_dev *idev);
+static void addrconf_rs_timer(unsigned long data);
+static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
+static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
+
+static void inet6_prefix_notify(int event, struct inet6_dev *idev,
+ struct prefix_info *pinfo);
+static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
+ struct net_device *dev);
+
+static struct ipv6_devconf ipv6_devconf __read_mostly = {
+ .forwarding = 0,
+ .hop_limit = IPV6_DEFAULT_HOPLIMIT,
+ .mtu6 = IPV6_MIN_MTU,
+ .accept_ra = 1,
+ .accept_redirects = 1,
+ .autoconf = 1,
+ .force_mld_version = 0,
+ .mldv1_unsolicited_report_interval = 10 * HZ,
+ .mldv2_unsolicited_report_interval = HZ,
+ .dad_transmits = 1,
+ .rtr_solicits = MAX_RTR_SOLICITATIONS,
+ .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
+ .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
+ .use_tempaddr = 0,
+ .temp_valid_lft = TEMP_VALID_LIFETIME,
+ .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
+ .regen_max_retry = REGEN_MAX_RETRY,
+ .max_desync_factor = MAX_DESYNC_FACTOR,
+ .max_addresses = IPV6_MAX_ADDRESSES,
+ .accept_ra_defrtr = 1,
+ .accept_ra_from_local = 0,
+ .accept_ra_pinfo = 1,
+#ifdef CONFIG_IPV6_ROUTER_PREF
+ .accept_ra_rtr_pref = 1,
+ .rtr_probe_interval = 60 * HZ,
+#ifdef CONFIG_IPV6_ROUTE_INFO
+ .accept_ra_rt_info_max_plen = 0,
+#endif
+#endif
+ .proxy_ndp = 0,
+ .accept_source_route = 0, /* we do not accept RH0 by default. */
+ .disable_ipv6 = 0,
+ .accept_dad = 1,
+ .suppress_frag_ndisc = 1,
+ .accept_ra_mtu = 1,
+ .stable_secret = {
+ .initialized = false,
+ }
+};
+
+static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
+ .forwarding = 0,
+ .hop_limit = IPV6_DEFAULT_HOPLIMIT,
+ .mtu6 = IPV6_MIN_MTU,
+ .accept_ra = 1,
+ .accept_redirects = 1,
+ .autoconf = 1,
+ .force_mld_version = 0,
+ .mldv1_unsolicited_report_interval = 10 * HZ,
+ .mldv2_unsolicited_report_interval = HZ,
+ .dad_transmits = 1,
+ .rtr_solicits = MAX_RTR_SOLICITATIONS,
+ .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
+ .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
+ .use_tempaddr = 0,
+ .temp_valid_lft = TEMP_VALID_LIFETIME,
+ .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
+ .regen_max_retry = REGEN_MAX_RETRY,
+ .max_desync_factor = MAX_DESYNC_FACTOR,
+ .max_addresses = IPV6_MAX_ADDRESSES,
+ .accept_ra_defrtr = 1,
+ .accept_ra_from_local = 0,
+ .accept_ra_pinfo = 1,
+#ifdef CONFIG_IPV6_ROUTER_PREF
+ .accept_ra_rtr_pref = 1,
+ .rtr_probe_interval = 60 * HZ,
+#ifdef CONFIG_IPV6_ROUTE_INFO
+ .accept_ra_rt_info_max_plen = 0,
+#endif
+#endif
+ .proxy_ndp = 0,
+ .accept_source_route = 0, /* we do not accept RH0 by default. */
+ .disable_ipv6 = 0,
+ .accept_dad = 1,
+ .suppress_frag_ndisc = 1,
+ .accept_ra_mtu = 1,
+ .stable_secret = {
+ .initialized = false,
+ },
+};
+
+/* Check if a valid qdisc is available */
+static inline bool addrconf_qdisc_ok(const struct net_device *dev)
+{
+ return !qdisc_tx_is_noop(dev);
+}
+
+static void addrconf_del_rs_timer(struct inet6_dev *idev)
+{
+ if (del_timer(&idev->rs_timer))
+ __in6_dev_put(idev);
+}
+
+static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
+{
+ if (cancel_delayed_work(&ifp->dad_work))
+ __in6_ifa_put(ifp);
+}
+
+static void addrconf_mod_rs_timer(struct inet6_dev *idev,
+ unsigned long when)
+{
+ if (!timer_pending(&idev->rs_timer))
+ in6_dev_hold(idev);
+ mod_timer(&idev->rs_timer, jiffies + when);
+}
+
+static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
+ unsigned long delay)
+{
+ if (!delayed_work_pending(&ifp->dad_work))
+ in6_ifa_hold(ifp);
+ mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
+}
+
+static int snmp6_alloc_dev(struct inet6_dev *idev)
+{
+ int i;
+
+ idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
+ if (!idev->stats.ipv6)
+ goto err_ip;
+
+ for_each_possible_cpu(i) {
+ struct ipstats_mib *addrconf_stats;
+ addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
+ u64_stats_init(&addrconf_stats->syncp);
+ }
+
+
+ idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
+ GFP_KERNEL);
+ if (!idev->stats.icmpv6dev)
+ goto err_icmp;
+ idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
+ GFP_KERNEL);
+ if (!idev->stats.icmpv6msgdev)
+ goto err_icmpmsg;
+
+ return 0;
+
+err_icmpmsg:
+ kfree(idev->stats.icmpv6dev);
+err_icmp:
+ free_percpu(idev->stats.ipv6);
+err_ip:
+ return -ENOMEM;
+}
+
+static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
+{
+ struct inet6_dev *ndev;
+ int err = -ENOMEM;
+
+ ASSERT_RTNL();
+
+ if (dev->mtu < IPV6_MIN_MTU)
+ return ERR_PTR(-EINVAL);
+
+ ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
+ if (!ndev)
+ return ERR_PTR(err);
+
+ rwlock_init(&ndev->lock);
+ ndev->dev = dev;
+ INIT_LIST_HEAD(&ndev->addr_list);
+ setup_timer(&ndev->rs_timer, addrconf_rs_timer,
+ (unsigned long)ndev);
+ memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
+ ndev->cnf.mtu6 = dev->mtu;
+ ndev->cnf.sysctl = NULL;
+ ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
+ if (!ndev->nd_parms) {
+ kfree(ndev);
+ return ERR_PTR(err);
+ }
+ if (ndev->cnf.forwarding)
+ dev_disable_lro(dev);
+ /* We refer to the device */
+ dev_hold(dev);
+
+ if (snmp6_alloc_dev(ndev) < 0) {
+ ADBG(KERN_WARNING
+ "%s: cannot allocate memory for statistics; dev=%s.\n",
+ __func__, dev->name);
+ neigh_parms_release(&nd_tbl, ndev->nd_parms);
+ dev_put(dev);
+ kfree(ndev);
+ return ERR_PTR(err);
+ }
+
+ if (snmp6_register_dev(ndev) < 0) {
+ ADBG(KERN_WARNING
+ "%s: cannot create /proc/net/dev_snmp6/%s\n",
+ __func__, dev->name);
+ goto err_release;
+ }
+
+ /* One reference from device. We must do this before
+ * we invoke __ipv6_regen_rndid().
+ */
+ in6_dev_hold(ndev);
+
+ if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
+ ndev->cnf.accept_dad = -1;
+
+#if IS_ENABLED(CONFIG_IPV6_SIT)
+ if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
+ pr_info("%s: Disabled Multicast RS\n", dev->name);
+ ndev->cnf.rtr_solicits = 0;
+ }
+#endif
+
+ INIT_LIST_HEAD(&ndev->tempaddr_list);
+ setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
+ if ((dev->flags&IFF_LOOPBACK) ||
+ dev->type == ARPHRD_TUNNEL ||
+ dev->type == ARPHRD_TUNNEL6 ||
+ dev->type == ARPHRD_SIT ||
+ dev->type == ARPHRD_NONE) {
+ ndev->cnf.use_tempaddr = -1;
+ } else {
+ in6_dev_hold(ndev);
+ ipv6_regen_rndid((unsigned long) ndev);
+ }
+
+ ndev->token = in6addr_any;
+
+ if (netif_running(dev) && addrconf_qdisc_ok(dev))
+ ndev->if_flags |= IF_READY;
+
+ ipv6_mc_init_dev(ndev);
+ ndev->tstamp = jiffies;
+ err = addrconf_sysctl_register(ndev);
+ if (err) {
+ ipv6_mc_destroy_dev(ndev);
+ del_timer(&ndev->regen_timer);
+ goto err_release;
+ }
+ /* protected by rtnl_lock */
+ rcu_assign_pointer(dev->ip6_ptr, ndev);
+
+ /* Join interface-local all-node multicast group */
+ ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
+
+ /* Join all-node multicast group */
+ ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
+
+ /* Join all-router multicast group if forwarding is set */
+ if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
+ ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
+
+ return ndev;
+
+err_release:
+ neigh_parms_release(&nd_tbl, ndev->nd_parms);
+ ndev->dead = 1;
+ in6_dev_finish_destroy(ndev);
+ return ERR_PTR(err);
+}
+
+static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
+{
+ struct inet6_dev *idev;
+
+ ASSERT_RTNL();
+
+ idev = __in6_dev_get(dev);
+ if (!idev) {
+ idev = ipv6_add_dev(dev);
+ if (IS_ERR(idev))
+ return NULL;
+ }
+
+ if (dev->flags&IFF_UP)
+ ipv6_mc_up(idev);
+ return idev;
+}
+
+static int inet6_netconf_msgsize_devconf(int type)
+{
+ int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
+ + nla_total_size(4); /* NETCONFA_IFINDEX */
+
+ /* type -1 is used for ALL */
+ if (type == -1 || type == NETCONFA_FORWARDING)
+ size += nla_total_size(4);
+#ifdef CONFIG_IPV6_MROUTE
+ if (type == -1 || type == NETCONFA_MC_FORWARDING)
+ size += nla_total_size(4);
+#endif
+ if (type == -1 || type == NETCONFA_PROXY_NEIGH)
+ size += nla_total_size(4);
+
+ return size;
+}
+
+static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
+ struct ipv6_devconf *devconf, u32 portid,
+ u32 seq, int event, unsigned int flags,
+ int type)
+{
+ struct nlmsghdr *nlh;
+ struct netconfmsg *ncm;
+
+ nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
+ flags);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ ncm = nlmsg_data(nlh);
+ ncm->ncm_family = AF_INET6;
+
+ if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
+ goto nla_put_failure;
+
+ /* type -1 is used for ALL */
+ if ((type == -1 || type == NETCONFA_FORWARDING) &&
+ nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
+ goto nla_put_failure;
+#ifdef CONFIG_IPV6_MROUTE
+ if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
+ nla_put_s32(skb, NETCONFA_MC_FORWARDING,
+ devconf->mc_forwarding) < 0)
+ goto nla_put_failure;
+#endif
+ if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
+ nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
+ goto nla_put_failure;
+
+ nlmsg_end(skb, nlh);
+ return 0;
+
+nla_put_failure:
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+}
+
+void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
+ struct ipv6_devconf *devconf)
+{
+ struct sk_buff *skb;
+ int err = -ENOBUFS;
+
+ skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
+ if (!skb)
+ goto errout;
+
+ err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
+ RTM_NEWNETCONF, 0, type);
+ if (err < 0) {
+ /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout;
+ }
+ rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
+ return;
+errout:
+ rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
+}
+
+static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
+ [NETCONFA_IFINDEX] = { .len = sizeof(int) },
+ [NETCONFA_FORWARDING] = { .len = sizeof(int) },
+ [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
+};
+
+static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
+ struct nlmsghdr *nlh)
+{
+ struct net *net = sock_net(in_skb->sk);
+ struct nlattr *tb[NETCONFA_MAX+1];
+ struct netconfmsg *ncm;
+ struct sk_buff *skb;
+ struct ipv6_devconf *devconf;
+ struct inet6_dev *in6_dev;
+ struct net_device *dev;
+ int ifindex;
+ int err;
+
+ err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
+ devconf_ipv6_policy);
+ if (err < 0)
+ goto errout;
+
+ err = EINVAL;
+ if (!tb[NETCONFA_IFINDEX])
+ goto errout;
+
+ ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
+ switch (ifindex) {
+ case NETCONFA_IFINDEX_ALL:
+ devconf = net->ipv6.devconf_all;
+ break;
+ case NETCONFA_IFINDEX_DEFAULT:
+ devconf = net->ipv6.devconf_dflt;
+ break;
+ default:
+ dev = __dev_get_by_index(net, ifindex);
+ if (!dev)
+ goto errout;
+ in6_dev = __in6_dev_get(dev);
+ if (!in6_dev)
+ goto errout;
+ devconf = &in6_dev->cnf;
+ break;
+ }
+
+ err = -ENOBUFS;
+ skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
+ if (!skb)
+ goto errout;
+
+ err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
+ NETLINK_CB(in_skb).portid,
+ nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
+ -1);
+ if (err < 0) {
+ /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout;
+ }
+ err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
+errout:
+ return err;
+}
+
+static int inet6_netconf_dump_devconf(struct sk_buff *skb,
+ struct netlink_callback *cb)
+{
+ struct net *net = sock_net(skb->sk);
+ int h, s_h;
+ int idx, s_idx;
+ struct net_device *dev;
+ struct inet6_dev *idev;
+ struct hlist_head *head;
+
+ s_h = cb->args[0];
+ s_idx = idx = cb->args[1];
+
+ for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
+ idx = 0;
+ head = &net->dev_index_head[h];
+ rcu_read_lock();
+ cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
+ net->dev_base_seq;
+ hlist_for_each_entry_rcu(dev, head, index_hlist) {
+ if (idx < s_idx)
+ goto cont;
+ idev = __in6_dev_get(dev);
+ if (!idev)
+ goto cont;
+
+ if (inet6_netconf_fill_devconf(skb, dev->ifindex,
+ &idev->cnf,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ RTM_NEWNETCONF,
+ NLM_F_MULTI,
+ -1) < 0) {
+ rcu_read_unlock();
+ goto done;
+ }
+ nl_dump_check_consistent(cb, nlmsg_hdr(skb));
+cont:
+ idx++;
+ }
+ rcu_read_unlock();
+ }
+ if (h == NETDEV_HASHENTRIES) {
+ if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
+ net->ipv6.devconf_all,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ RTM_NEWNETCONF, NLM_F_MULTI,
+ -1) < 0)
+ goto done;
+ else
+ h++;
+ }
+ if (h == NETDEV_HASHENTRIES + 1) {
+ if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
+ net->ipv6.devconf_dflt,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ RTM_NEWNETCONF, NLM_F_MULTI,
+ -1) < 0)
+ goto done;
+ else
+ h++;
+ }
+done:
+ cb->args[0] = h;
+ cb->args[1] = idx;
+
+ return skb->len;
+}
+
+#ifdef CONFIG_SYSCTL
+static void dev_forward_change(struct inet6_dev *idev)
+{
+ struct net_device *dev;
+ struct inet6_ifaddr *ifa;
+
+ if (!idev)
+ return;
+ dev = idev->dev;
+ if (idev->cnf.forwarding)
+ dev_disable_lro(dev);
+ if (dev->flags & IFF_MULTICAST) {
+ if (idev->cnf.forwarding) {
+ ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
+ ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
+ ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
+ } else {
+ ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
+ ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
+ ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
+ }
+ }
+
+ list_for_each_entry(ifa, &idev->addr_list, if_list) {
+ if (ifa->flags&IFA_F_TENTATIVE)
+ continue;
+ if (idev->cnf.forwarding)
+ addrconf_join_anycast(ifa);
+ else
+ addrconf_leave_anycast(ifa);
+ }
+ inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
+ dev->ifindex, &idev->cnf);
+}
+
+
+static void addrconf_forward_change(struct net *net, __s32 newf)
+{
+ struct net_device *dev;
+ struct inet6_dev *idev;
+
+ for_each_netdev(net, dev) {
+ idev = __in6_dev_get(dev);
+ if (idev) {
+ int changed = (!idev->cnf.forwarding) ^ (!newf);
+ idev->cnf.forwarding = newf;
+ if (changed)
+ dev_forward_change(idev);
+ }
+ }
+}
+
+static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
+{
+ struct net *net;
+ int old;
+
+ if (!rtnl_trylock())
+ return restart_syscall();
+
+ net = (struct net *)table->extra2;
+ old = *p;
+ *p = newf;
+
+ if (p == &net->ipv6.devconf_dflt->forwarding) {
+ if ((!newf) ^ (!old))
+ inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
+ NETCONFA_IFINDEX_DEFAULT,
+ net->ipv6.devconf_dflt);
+ rtnl_unlock();
+ return 0;
+ }
+
+ if (p == &net->ipv6.devconf_all->forwarding) {
+ net->ipv6.devconf_dflt->forwarding = newf;
+ addrconf_forward_change(net, newf);
+ if ((!newf) ^ (!old))
+ inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
+ NETCONFA_IFINDEX_ALL,
+ net->ipv6.devconf_all);
+ } else if ((!newf) ^ (!old))
+ dev_forward_change((struct inet6_dev *)table->extra1);
+ rtnl_unlock();
+
+ if (newf)
+ rt6_purge_dflt_routers(net);
+ return 1;
+}
+#endif
+
+/* Nobody refers to this ifaddr, destroy it */
+void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
+{
+ WARN_ON(!hlist_unhashed(&ifp->addr_lst));
+
+#ifdef NET_REFCNT_DEBUG
+ pr_debug("%s\n", __func__);
+#endif
+
+ in6_dev_put(ifp->idev);
+
+ if (cancel_delayed_work(&ifp->dad_work))
+ pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
+ ifp);
+
+ if (ifp->state != INET6_IFADDR_STATE_DEAD) {
+ pr_warn("Freeing alive inet6 address %p\n", ifp);
+ return;
+ }
+ ip6_rt_put(ifp->rt);
+
+ kfree_rcu(ifp, rcu);
+}
+
+static void
+ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
+{
+ struct list_head *p;
+ int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
+
+ /*
+ * Each device address list is sorted in order of scope -
+ * global before linklocal.
+ */
+ list_for_each(p, &idev->addr_list) {
+ struct inet6_ifaddr *ifa
+ = list_entry(p, struct inet6_ifaddr, if_list);
+ if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
+ break;
+ }
+
+ list_add_tail(&ifp->if_list, p);
+}
+
+static u32 inet6_addr_hash(const struct in6_addr *addr)
+{
+ return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
+}
+
+/* On success it returns ifp with increased reference count */
+
+static struct inet6_ifaddr *
+ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
+ const struct in6_addr *peer_addr, int pfxlen,
+ int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
+{
+ struct inet6_ifaddr *ifa = NULL;
+ struct rt6_info *rt;
+ unsigned int hash;
+ int err = 0;
+ int addr_type = ipv6_addr_type(addr);
+
+ if (addr_type == IPV6_ADDR_ANY ||
+ addr_type & IPV6_ADDR_MULTICAST ||
+ (!(idev->dev->flags & IFF_LOOPBACK) &&
+ addr_type & IPV6_ADDR_LOOPBACK))
+ return ERR_PTR(-EADDRNOTAVAIL);
+
+ rcu_read_lock_bh();
+ if (idev->dead) {
+ err = -ENODEV; /*XXX*/
+ goto out2;
+ }
+
+ if (idev->cnf.disable_ipv6) {
+ err = -EACCES;
+ goto out2;
+ }
+
+ spin_lock(&addrconf_hash_lock);
+
+ /* Ignore adding duplicate addresses on an interface */
+ if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
+ ADBG("ipv6_add_addr: already assigned\n");
+ err = -EEXIST;
+ goto out;
+ }
+
+ ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
+
+ if (!ifa) {
+ ADBG("ipv6_add_addr: malloc failed\n");
+ err = -ENOBUFS;
+ goto out;
+ }
+
+ rt = addrconf_dst_alloc(idev, addr, false);
+ if (IS_ERR(rt)) {
+ err = PTR_ERR(rt);
+ goto out;
+ }
+
+ neigh_parms_data_state_setall(idev->nd_parms);
+
+ ifa->addr = *addr;
+ if (peer_addr)
+ ifa->peer_addr = *peer_addr;
+
+ spin_lock_init(&ifa->lock);
+ INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
+ INIT_HLIST_NODE(&ifa->addr_lst);
+ ifa->scope = scope;
+ ifa->prefix_len = pfxlen;
+ ifa->flags = flags | IFA_F_TENTATIVE;
+ ifa->valid_lft = valid_lft;
+ ifa->prefered_lft = prefered_lft;
+ ifa->cstamp = ifa->tstamp = jiffies;
+ ifa->tokenized = false;
+
+ ifa->rt = rt;
+
+ ifa->idev = idev;
+ in6_dev_hold(idev);
+ /* For caller */
+ in6_ifa_hold(ifa);
+
+ /* Add to big hash table */
+ hash = inet6_addr_hash(addr);
+
+ hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
+ spin_unlock(&addrconf_hash_lock);
+
+ write_lock(&idev->lock);
+ /* Add to inet6_dev unicast addr list. */
+ ipv6_link_dev_addr(idev, ifa);
+
+ if (ifa->flags&IFA_F_TEMPORARY) {
+ list_add(&ifa->tmp_list, &idev->tempaddr_list);
+ in6_ifa_hold(ifa);
+ }
+
+ in6_ifa_hold(ifa);
+ write_unlock(&idev->lock);
+out2:
+ rcu_read_unlock_bh();
+
+ if (likely(err == 0))
+ inet6addr_notifier_call_chain(NETDEV_UP, ifa);
+ else {
+ kfree(ifa);
+ ifa = ERR_PTR(err);
+ }
+
+ return ifa;
+out:
+ spin_unlock(&addrconf_hash_lock);
+ goto out2;
+}
+
+enum cleanup_prefix_rt_t {
+ CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
+ CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
+ CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
+};
+
+/*
+ * Check, whether the prefix for ifp would still need a prefix route
+ * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
+ * constants.
+ *
+ * 1) we don't purge prefix if address was not permanent.
+ * prefix is managed by its own lifetime.
+ * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
+ * 3) if there are no addresses, delete prefix.
+ * 4) if there are still other permanent address(es),
+ * corresponding prefix is still permanent.
+ * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
+ * don't purge the prefix, assume user space is managing it.
+ * 6) otherwise, update prefix lifetime to the
+ * longest valid lifetime among the corresponding
+ * addresses on the device.
+ * Note: subsequent RA will update lifetime.
+ **/
+static enum cleanup_prefix_rt_t
+check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
+{
+ struct inet6_ifaddr *ifa;
+ struct inet6_dev *idev = ifp->idev;
+ unsigned long lifetime;
+ enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
+
+ *expires = jiffies;
+
+ list_for_each_entry(ifa, &idev->addr_list, if_list) {
+ if (ifa == ifp)
+ continue;
+ if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
+ ifp->prefix_len))
+ continue;
+ if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
+ return CLEANUP_PREFIX_RT_NOP;
+
+ action = CLEANUP_PREFIX_RT_EXPIRE;
+
+ spin_lock(&ifa->lock);
+
+ lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
+ /*
+ * Note: Because this address is
+ * not permanent, lifetime <
+ * LONG_MAX / HZ here.
+ */
+ if (time_before(*expires, ifa->tstamp + lifetime * HZ))
+ *expires = ifa->tstamp + lifetime * HZ;
+ spin_unlock(&ifa->lock);
+ }
+
+ return action;
+}
+
+static void
+cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
+{
+ struct rt6_info *rt;
+
+ rt = addrconf_get_prefix_route(&ifp->addr,
+ ifp->prefix_len,
+ ifp->idev->dev,
+ 0, RTF_GATEWAY | RTF_DEFAULT);
+ if (rt) {
+ if (del_rt)
+ ip6_del_rt(rt);
+ else {
+ if (!(rt->rt6i_flags & RTF_EXPIRES))
+ rt6_set_expires(rt, expires);
+ ip6_rt_put(rt);
+ }
+ }
+}
+
+
+/* This function wants to get referenced ifp and releases it before return */
+
+static void ipv6_del_addr(struct inet6_ifaddr *ifp)
+{
+ int state;
+ enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
+ unsigned long expires;
+
+ ASSERT_RTNL();
+
+ spin_lock_bh(&ifp->lock);
+ state = ifp->state;
+ ifp->state = INET6_IFADDR_STATE_DEAD;
+ spin_unlock_bh(&ifp->lock);
+
+ if (state == INET6_IFADDR_STATE_DEAD)
+ goto out;
+
+ spin_lock_bh(&addrconf_hash_lock);
+ hlist_del_init_rcu(&ifp->addr_lst);
+ spin_unlock_bh(&addrconf_hash_lock);
+
+ write_lock_bh(&ifp->idev->lock);
+
+ if (ifp->flags&IFA_F_TEMPORARY) {
+ list_del(&ifp->tmp_list);
+ if (ifp->ifpub) {
+ in6_ifa_put(ifp->ifpub);
+ ifp->ifpub = NULL;
+ }
+ __in6_ifa_put(ifp);
+ }
+
+ if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
+ action = check_cleanup_prefix_route(ifp, &expires);
+
+ list_del_init(&ifp->if_list);
+ __in6_ifa_put(ifp);
+
+ write_unlock_bh(&ifp->idev->lock);
+
+ addrconf_del_dad_work(ifp);
+
+ ipv6_ifa_notify(RTM_DELADDR, ifp);
+
+ inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
+
+ if (action != CLEANUP_PREFIX_RT_NOP) {
+ cleanup_prefix_route(ifp, expires,
+ action == CLEANUP_PREFIX_RT_DEL);
+ }
+
+ /* clean up prefsrc entries */
+ rt6_remove_prefsrc(ifp);
+out:
+ in6_ifa_put(ifp);
+}
+
+static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
+{
+ struct inet6_dev *idev = ifp->idev;
+ struct in6_addr addr, *tmpaddr;
+ unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
+ unsigned long regen_advance;
+ int tmp_plen;
+ int ret = 0;
+ u32 addr_flags;
+ unsigned long now = jiffies;
+
+ write_lock_bh(&idev->lock);
+ if (ift) {
+ spin_lock_bh(&ift->lock);
+ memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
+ spin_unlock_bh(&ift->lock);
+ tmpaddr = &addr;
+ } else {
+ tmpaddr = NULL;
+ }
+retry:
+ in6_dev_hold(idev);
+ if (idev->cnf.use_tempaddr <= 0) {
+ write_unlock_bh(&idev->lock);
+ pr_info("%s: use_tempaddr is disabled\n", __func__);
+ in6_dev_put(idev);
+ ret = -1;
+ goto out;
+ }
+ spin_lock_bh(&ifp->lock);
+ if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
+ idev->cnf.use_tempaddr = -1; /*XXX*/
+ spin_unlock_bh(&ifp->lock);
+ write_unlock_bh(&idev->lock);
+ pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
+ __func__);
+ in6_dev_put(idev);
+ ret = -1;
+ goto out;
+ }
+ in6_ifa_hold(ifp);
+ memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
+ __ipv6_try_regen_rndid(idev, tmpaddr);
+ memcpy(&addr.s6_addr[8], idev->rndid, 8);
+ age = (now - ifp->tstamp) / HZ;
+ tmp_valid_lft = min_t(__u32,
+ ifp->valid_lft,
+ idev->cnf.temp_valid_lft + age);
+ tmp_prefered_lft = min_t(__u32,
+ ifp->prefered_lft,
+ idev->cnf.temp_prefered_lft + age -
+ idev->cnf.max_desync_factor);
+ tmp_plen = ifp->prefix_len;
+ tmp_tstamp = ifp->tstamp;
+ spin_unlock_bh(&ifp->lock);
+
+ regen_advance = idev->cnf.regen_max_retry *
+ idev->cnf.dad_transmits *
+ NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
+ write_unlock_bh(&idev->lock);
+
+ /* A temporary address is created only if this calculated Preferred
+ * Lifetime is greater than REGEN_ADVANCE time units. In particular,
+ * an implementation must not create a temporary address with a zero
+ * Preferred Lifetime.
+ * Use age calculation as in addrconf_verify to avoid unnecessary
+ * temporary addresses being generated.
+ */
+ age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
+ if (tmp_prefered_lft <= regen_advance + age) {
+ in6_ifa_put(ifp);
+ in6_dev_put(idev);
+ ret = -1;
+ goto out;
+ }
+
+ addr_flags = IFA_F_TEMPORARY;
+ /* set in addrconf_prefix_rcv() */
+ if (ifp->flags & IFA_F_OPTIMISTIC)
+ addr_flags |= IFA_F_OPTIMISTIC;
+
+ ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
+ ipv6_addr_scope(&addr), addr_flags,
+ tmp_valid_lft, tmp_prefered_lft);
+ if (IS_ERR(ift)) {
+ in6_ifa_put(ifp);
+ in6_dev_put(idev);
+ pr_info("%s: retry temporary address regeneration\n", __func__);
+ tmpaddr = &addr;
+ write_lock_bh(&idev->lock);
+ goto retry;
+ }
+
+ spin_lock_bh(&ift->lock);
+ ift->ifpub = ifp;
+ ift->cstamp = now;
+ ift->tstamp = tmp_tstamp;
+ spin_unlock_bh(&ift->lock);
+
+ addrconf_dad_start(ift);
+ in6_ifa_put(ift);
+ in6_dev_put(idev);
+out:
+ return ret;
+}
+
+/*
+ * Choose an appropriate source address (RFC3484)
+ */
+enum {
+ IPV6_SADDR_RULE_INIT = 0,
+ IPV6_SADDR_RULE_LOCAL,
+ IPV6_SADDR_RULE_SCOPE,
+ IPV6_SADDR_RULE_PREFERRED,
+#ifdef CONFIG_IPV6_MIP6
+ IPV6_SADDR_RULE_HOA,
+#endif
+ IPV6_SADDR_RULE_OIF,
+ IPV6_SADDR_RULE_LABEL,
+ IPV6_SADDR_RULE_PRIVACY,
+ IPV6_SADDR_RULE_ORCHID,
+ IPV6_SADDR_RULE_PREFIX,
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+ IPV6_SADDR_RULE_NOT_OPTIMISTIC,
+#endif
+ IPV6_SADDR_RULE_MAX
+};
+
+struct ipv6_saddr_score {
+ int rule;
+ int addr_type;
+ struct inet6_ifaddr *ifa;
+ DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
+ int scopedist;
+ int matchlen;
+};
+
+struct ipv6_saddr_dst {
+ const struct in6_addr *addr;
+ int ifindex;
+ int scope;
+ int label;
+ unsigned int prefs;
+};
+
+static inline int ipv6_saddr_preferred(int type)
+{
+ if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
+ return 1;
+ return 0;
+}
+
+static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
+{
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+ return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
+#else
+ return false;
+#endif
+}
+
+static int ipv6_get_saddr_eval(struct net *net,
+ struct ipv6_saddr_score *score,
+ struct ipv6_saddr_dst *dst,
+ int i)
+{
+ int ret;
+
+ if (i <= score->rule) {
+ switch (i) {
+ case IPV6_SADDR_RULE_SCOPE:
+ ret = score->scopedist;
+ break;
+ case IPV6_SADDR_RULE_PREFIX:
+ ret = score->matchlen;
+ break;
+ default:
+ ret = !!test_bit(i, score->scorebits);
+ }
+ goto out;
+ }
+
+ switch (i) {
+ case IPV6_SADDR_RULE_INIT:
+ /* Rule 0: remember if hiscore is not ready yet */
+ ret = !!score->ifa;
+ break;
+ case IPV6_SADDR_RULE_LOCAL:
+ /* Rule 1: Prefer same address */
+ ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
+ break;
+ case IPV6_SADDR_RULE_SCOPE:
+ /* Rule 2: Prefer appropriate scope
+ *
+ * ret
+ * ^
+ * -1 | d 15
+ * ---+--+-+---> scope
+ * |
+ * | d is scope of the destination.
+ * B-d | \
+ * | \ <- smaller scope is better if
+ * B-15 | \ if scope is enough for destination.
+ * | ret = B - scope (-1 <= scope >= d <= 15).
+ * d-C-1 | /
+ * |/ <- greater is better
+ * -C / if scope is not enough for destination.
+ * /| ret = scope - C (-1 <= d < scope <= 15).
+ *
+ * d - C - 1 < B -15 (for all -1 <= d <= 15).
+ * C > d + 14 - B >= 15 + 14 - B = 29 - B.
+ * Assume B = 0 and we get C > 29.
+ */
+ ret = __ipv6_addr_src_scope(score->addr_type);
+ if (ret >= dst->scope)
+ ret = -ret;
+ else
+ ret -= 128; /* 30 is enough */
+ score->scopedist = ret;
+ break;
+ case IPV6_SADDR_RULE_PREFERRED:
+ {
+ /* Rule 3: Avoid deprecated and optimistic addresses */
+ u8 avoid = IFA_F_DEPRECATED;
+
+ if (!ipv6_use_optimistic_addr(score->ifa->idev))
+ avoid |= IFA_F_OPTIMISTIC;
+ ret = ipv6_saddr_preferred(score->addr_type) ||
+ !(score->ifa->flags & avoid);
+ break;
+ }
+#ifdef CONFIG_IPV6_MIP6
+ case IPV6_SADDR_RULE_HOA:
+ {
+ /* Rule 4: Prefer home address */
+ int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
+ ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
+ break;
+ }
+#endif
+ case IPV6_SADDR_RULE_OIF:
+ /* Rule 5: Prefer outgoing interface */
+ ret = (!dst->ifindex ||
+ dst->ifindex == score->ifa->idev->dev->ifindex);
+ break;
+ case IPV6_SADDR_RULE_LABEL:
+ /* Rule 6: Prefer matching label */
+ ret = ipv6_addr_label(net,
+ &score->ifa->addr, score->addr_type,
+ score->ifa->idev->dev->ifindex) == dst->label;
+ break;
+ case IPV6_SADDR_RULE_PRIVACY:
+ {
+ /* Rule 7: Prefer public address
+ * Note: prefer temporary address if use_tempaddr >= 2
+ */
+ int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
+ !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
+ score->ifa->idev->cnf.use_tempaddr >= 2;
+ ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
+ break;
+ }
+ case IPV6_SADDR_RULE_ORCHID:
+ /* Rule 8-: Prefer ORCHID vs ORCHID or
+ * non-ORCHID vs non-ORCHID
+ */
+ ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
+ ipv6_addr_orchid(dst->addr));
+ break;
+ case IPV6_SADDR_RULE_PREFIX:
+ /* Rule 8: Use longest matching prefix */
+ ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
+ if (ret > score->ifa->prefix_len)
+ ret = score->ifa->prefix_len;
+ score->matchlen = ret;
+ break;
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+ case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
+ /* Optimistic addresses still have lower precedence than other
+ * preferred addresses.
+ */
+ ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
+ break;
+#endif
+ default:
+ ret = 0;
+ }
+
+ if (ret)
+ __set_bit(i, score->scorebits);
+ score->rule = i;
+out:
+ return ret;
+}
+
+int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
+ const struct in6_addr *daddr, unsigned int prefs,
+ struct in6_addr *saddr)
+{
+ struct ipv6_saddr_score scores[2],
+ *score = &scores[0], *hiscore = &scores[1];
+ struct ipv6_saddr_dst dst;
+ struct net_device *dev;
+ int dst_type;
+
+ dst_type = __ipv6_addr_type(daddr);
+ dst.addr = daddr;
+ dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
+ dst.scope = __ipv6_addr_src_scope(dst_type);
+ dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
+ dst.prefs = prefs;
+
+ hiscore->rule = -1;
+ hiscore->ifa = NULL;
+
+ rcu_read_lock();
+
+ for_each_netdev_rcu(net, dev) {
+ struct inet6_dev *idev;
+
+ /* Candidate Source Address (section 4)
+ * - multicast and link-local destination address,
+ * the set of candidate source address MUST only
+ * include addresses assigned to interfaces
+ * belonging to the same link as the outgoing
+ * interface.
+ * (- For site-local destination addresses, the
+ * set of candidate source addresses MUST only
+ * include addresses assigned to interfaces
+ * belonging to the same site as the outgoing
+ * interface.)
+ */
+ if (((dst_type & IPV6_ADDR_MULTICAST) ||
+ dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
+ dst.ifindex && dev->ifindex != dst.ifindex)
+ continue;
+
+ idev = __in6_dev_get(dev);
+ if (!idev)
+ continue;
+
+ read_lock_bh(&idev->lock);
+ list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
+ int i;
+
+ /*
+ * - Tentative Address (RFC2462 section 5.4)
+ * - A tentative address is not considered
+ * "assigned to an interface" in the traditional
+ * sense, unless it is also flagged as optimistic.
+ * - Candidate Source Address (section 4)
+ * - In any case, anycast addresses, multicast
+ * addresses, and the unspecified address MUST
+ * NOT be included in a candidate set.
+ */
+ if ((score->ifa->flags & IFA_F_TENTATIVE) &&
+ (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
+ continue;
+
+ score->addr_type = __ipv6_addr_type(&score->ifa->addr);
+
+ if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
+ score->addr_type & IPV6_ADDR_MULTICAST)) {
+ net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
+ dev->name);
+ continue;
+ }
+
+ score->rule = -1;
+ bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
+
+ for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
+ int minihiscore, miniscore;
+
+ minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
+ miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
+
+ if (minihiscore > miniscore) {
+ if (i == IPV6_SADDR_RULE_SCOPE &&
+ score->scopedist > 0) {
+ /*
+ * special case:
+ * each remaining entry
+ * has too small (not enough)
+ * scope, because ifa entries
+ * are sorted by their scope
+ * values.
+ */
+ goto try_nextdev;
+ }
+ break;
+ } else if (minihiscore < miniscore) {
+ if (hiscore->ifa)
+ in6_ifa_put(hiscore->ifa);
+
+ in6_ifa_hold(score->ifa);
+
+ swap(hiscore, score);
+
+ /* restore our iterator */
+ score->ifa = hiscore->ifa;
+
+ break;
+ }
+ }
+ }
+try_nextdev:
+ read_unlock_bh(&idev->lock);
+ }
+ rcu_read_unlock();
+
+ if (!hiscore->ifa)
+ return -EADDRNOTAVAIL;
+
+ *saddr = hiscore->ifa->addr;
+ in6_ifa_put(hiscore->ifa);
+ return 0;
+}
+EXPORT_SYMBOL(ipv6_dev_get_saddr);
+
+int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
+ u32 banned_flags)
+{
+ struct inet6_ifaddr *ifp;
+ int err = -EADDRNOTAVAIL;
+
+ list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
+ if (ifp->scope > IFA_LINK)
+ break;
+ if (ifp->scope == IFA_LINK &&
+ !(ifp->flags & banned_flags)) {
+ *addr = ifp->addr;
+ err = 0;
+ break;
+ }
+ }
+ return err;
+}
+
+int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
+ u32 banned_flags)
+{
+ struct inet6_dev *idev;
+ int err = -EADDRNOTAVAIL;
+
+ rcu_read_lock();
+ idev = __in6_dev_get(dev);
+ if (idev) {
+ read_lock_bh(&idev->lock);
+ err = __ipv6_get_lladdr(idev, addr, banned_flags);
+ read_unlock_bh(&idev->lock);
+ }
+ rcu_read_unlock();
+ return err;
+}
+
+static int ipv6_count_addresses(struct inet6_dev *idev)
+{
+ int cnt = 0;
+ struct inet6_ifaddr *ifp;
+
+ read_lock_bh(&idev->lock);
+ list_for_each_entry(ifp, &idev->addr_list, if_list)
+ cnt++;
+ read_unlock_bh(&idev->lock);
+ return cnt;
+}
+
+int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
+ const struct net_device *dev, int strict)
+{
+ return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
+}
+EXPORT_SYMBOL(ipv6_chk_addr);
+
+int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
+ const struct net_device *dev, int strict,
+ u32 banned_flags)
+{
+ struct inet6_ifaddr *ifp;
+ unsigned int hash = inet6_addr_hash(addr);
+ u32 ifp_flags;
+
+ rcu_read_lock_bh();
+ hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
+ if (!net_eq(dev_net(ifp->idev->dev), net))
+ continue;
+ /* Decouple optimistic from tentative for evaluation here.
+ * Ban optimistic addresses explicitly, when required.
+ */
+ ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
+ ? (ifp->flags&~IFA_F_TENTATIVE)
+ : ifp->flags;
+ if (ipv6_addr_equal(&ifp->addr, addr) &&
+ !(ifp_flags&banned_flags) &&
+ (!dev || ifp->idev->dev == dev ||
+ !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
+ rcu_read_unlock_bh();
+ return 1;
+ }
+ }
+
+ rcu_read_unlock_bh();
+ return 0;
+}
+EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
+
+static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
+ struct net_device *dev)
+{
+ unsigned int hash = inet6_addr_hash(addr);
+ struct inet6_ifaddr *ifp;
+
+ hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
+ if (!net_eq(dev_net(ifp->idev->dev), net))
+ continue;
+ if (ipv6_addr_equal(&ifp->addr, addr)) {
+ if (!dev || ifp->idev->dev == dev)
+ return true;
+ }
+ }
+ return false;
+}
+
+/* Compares an address/prefix_len with addresses on device @dev.
+ * If one is found it returns true.
+ */
+bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
+ const unsigned int prefix_len, struct net_device *dev)
+{
+ struct inet6_dev *idev;
+ struct inet6_ifaddr *ifa;
+ bool ret = false;
+
+ rcu_read_lock();
+ idev = __in6_dev_get(dev);
+ if (idev) {
+ read_lock_bh(&idev->lock);
+ list_for_each_entry(ifa, &idev->addr_list, if_list) {
+ ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
+ if (ret)
+ break;
+ }
+ read_unlock_bh(&idev->lock);
+ }
+ rcu_read_unlock();
+
+ return ret;
+}
+EXPORT_SYMBOL(ipv6_chk_custom_prefix);
+
+int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
+{
+ struct inet6_dev *idev;
+ struct inet6_ifaddr *ifa;
+ int onlink;
+
+ onlink = 0;
+ rcu_read_lock();
+ idev = __in6_dev_get(dev);
+ if (idev) {
+ read_lock_bh(&idev->lock);
+ list_for_each_entry(ifa, &idev->addr_list, if_list) {
+ onlink = ipv6_prefix_equal(addr, &ifa->addr,
+ ifa->prefix_len);
+ if (onlink)
+ break;
+ }
+ read_unlock_bh(&idev->lock);
+ }
+ rcu_read_unlock();
+ return onlink;
+}
+EXPORT_SYMBOL(ipv6_chk_prefix);
+
+struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
+ struct net_device *dev, int strict)
+{
+ struct inet6_ifaddr *ifp, *result = NULL;
+ unsigned int hash = inet6_addr_hash(addr);
+
+ rcu_read_lock_bh();
+ hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
+ if (!net_eq(dev_net(ifp->idev->dev), net))
+ continue;
+ if (ipv6_addr_equal(&ifp->addr, addr)) {
+ if (!dev || ifp->idev->dev == dev ||
+ !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
+ result = ifp;
+ in6_ifa_hold(ifp);
+ break;
+ }
+ }
+ }
+ rcu_read_unlock_bh();
+
+ return result;
+}
+
+/* Gets referenced address, destroys ifaddr */
+
+static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
+{
+ if (ifp->flags&IFA_F_PERMANENT) {
+ spin_lock_bh(&ifp->lock);
+ addrconf_del_dad_work(ifp);
+ ifp->flags |= IFA_F_TENTATIVE;
+ if (dad_failed)
+ ifp->flags |= IFA_F_DADFAILED;
+ spin_unlock_bh(&ifp->lock);
+ if (dad_failed)
+ ipv6_ifa_notify(0, ifp);
+ in6_ifa_put(ifp);
+ } else if (ifp->flags&IFA_F_TEMPORARY) {
+ struct inet6_ifaddr *ifpub;
+ spin_lock_bh(&ifp->lock);
+ ifpub = ifp->ifpub;
+ if (ifpub) {
+ in6_ifa_hold(ifpub);
+ spin_unlock_bh(&ifp->lock);
+ ipv6_create_tempaddr(ifpub, ifp);
+ in6_ifa_put(ifpub);
+ } else {
+ spin_unlock_bh(&ifp->lock);
+ }
+ ipv6_del_addr(ifp);
+ } else {
+ ipv6_del_addr(ifp);
+ }
+}
+
+static int addrconf_dad_end(struct inet6_ifaddr *ifp)
+{
+ int err = -ENOENT;
+
+ spin_lock_bh(&ifp->lock);
+ if (ifp->state == INET6_IFADDR_STATE_DAD) {
+ ifp->state = INET6_IFADDR_STATE_POSTDAD;
+ err = 0;
+ }
+ spin_unlock_bh(&ifp->lock);
+
+ return err;
+}
+
+void addrconf_dad_failure(struct inet6_ifaddr *ifp)
+{
+ struct in6_addr addr;
+ struct inet6_dev *idev = ifp->idev;
+ struct net *net = dev_net(ifp->idev->dev);
+
+ if (addrconf_dad_end(ifp)) {
+ in6_ifa_put(ifp);
+ return;
+ }
+
+ net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
+ ifp->idev->dev->name, &ifp->addr);
+
+ spin_lock_bh(&ifp->lock);
+
+ if (ifp->flags & IFA_F_STABLE_PRIVACY) {
+ int scope = ifp->scope;
+ u32 flags = ifp->flags;
+ struct in6_addr new_addr;
+ struct inet6_ifaddr *ifp2;
+ u32 valid_lft, preferred_lft;
+ int pfxlen = ifp->prefix_len;
+ int retries = ifp->stable_privacy_retry + 1;
+
+ if (retries > net->ipv6.sysctl.idgen_retries) {
+ net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
+ ifp->idev->dev->name);
+ goto errdad;
+ }
+
+ new_addr = ifp->addr;
+ if (ipv6_generate_stable_address(&new_addr, retries,
+ idev))
+ goto errdad;
+
+ valid_lft = ifp->valid_lft;
+ preferred_lft = ifp->prefered_lft;
+
+ spin_unlock_bh(&ifp->lock);
+
+ if (idev->cnf.max_addresses &&
+ ipv6_count_addresses(idev) >=
+ idev->cnf.max_addresses)
+ goto lock_errdad;
+
+ net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
+ ifp->idev->dev->name);
+
+ ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
+ scope, flags, valid_lft,
+ preferred_lft);
+ if (IS_ERR(ifp2))
+ goto lock_errdad;
+
+ spin_lock_bh(&ifp2->lock);
+ ifp2->stable_privacy_retry = retries;
+ ifp2->state = INET6_IFADDR_STATE_PREDAD;
+ spin_unlock_bh(&ifp2->lock);
+
+ addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
+ in6_ifa_put(ifp2);
+lock_errdad:
+ spin_lock_bh(&ifp->lock);
+ } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
+ addr.s6_addr32[0] = htonl(0xfe800000);
+ addr.s6_addr32[1] = 0;
+
+ if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
+ ipv6_addr_equal(&ifp->addr, &addr)) {
+ /* DAD failed for link-local based on MAC address */
+ idev->cnf.disable_ipv6 = 1;
+
+ pr_info("%s: IPv6 being disabled!\n",
+ ifp->idev->dev->name);
+ }
+ }
+
+errdad:
+ /* transition from _POSTDAD to _ERRDAD */
+ ifp->state = INET6_IFADDR_STATE_ERRDAD;
+ spin_unlock_bh(&ifp->lock);
+
+ addrconf_mod_dad_work(ifp, 0);
+}
+
+/* Join to solicited addr multicast group.
+ * caller must hold RTNL */
+void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
+{
+ struct in6_addr maddr;
+
+ if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
+ return;
+
+ addrconf_addr_solict_mult(addr, &maddr);
+ ipv6_dev_mc_inc(dev, &maddr);
+}
+
+/* caller must hold RTNL */
+void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
+{
+ struct in6_addr maddr;
+
+ if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
+ return;
+
+ addrconf_addr_solict_mult(addr, &maddr);
+ __ipv6_dev_mc_dec(idev, &maddr);
+}
+
+/* caller must hold RTNL */
+static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
+{
+ struct in6_addr addr;
+
+ if (ifp->prefix_len >= 127) /* RFC 6164 */
+ return;
+ ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
+ if (ipv6_addr_any(&addr))
+ return;
+ __ipv6_dev_ac_inc(ifp->idev, &addr);
+}
+
+/* caller must hold RTNL */
+static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
+{
+ struct in6_addr addr;
+
+ if (ifp->prefix_len >= 127) /* RFC 6164 */
+ return;
+ ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
+ if (ipv6_addr_any(&addr))
+ return;
+ __ipv6_dev_ac_dec(ifp->idev, &addr);
+}
+
+static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
+{
+ if (dev->addr_len != ETH_ALEN)
+ return -1;
+ memcpy(eui, dev->dev_addr, 3);
+ memcpy(eui + 5, dev->dev_addr + 3, 3);
+
+ /*
+ * The zSeries OSA network cards can be shared among various
+ * OS instances, but the OSA cards have only one MAC address.
+ * This leads to duplicate address conflicts in conjunction
+ * with IPv6 if more than one instance uses the same card.
+ *
+ * The driver for these cards can deliver a unique 16-bit
+ * identifier for each instance sharing the same card. It is
+ * placed instead of 0xFFFE in the interface identifier. The
+ * "u" bit of the interface identifier is not inverted in this
+ * case. Hence the resulting interface identifier has local
+ * scope according to RFC2373.
+ */
+ if (dev->dev_id) {
+ eui[3] = (dev->dev_id >> 8) & 0xFF;
+ eui[4] = dev->dev_id & 0xFF;
+ } else {
+ eui[3] = 0xFF;
+ eui[4] = 0xFE;
+ eui[0] ^= 2;
+ }
+ return 0;
+}
+
+static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
+{
+ if (dev->addr_len != IEEE802154_ADDR_LEN)
+ return -1;
+ memcpy(eui, dev->dev_addr, 8);
+ eui[0] ^= 2;
+ return 0;
+}
+
+static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
+{
+ union fwnet_hwaddr *ha;
+
+ if (dev->addr_len != FWNET_ALEN)
+ return -1;
+
+ ha = (union fwnet_hwaddr *)dev->dev_addr;
+
+ memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
+ eui[0] ^= 2;
+ return 0;
+}
+
+static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
+{
+ /* XXX: inherit EUI-64 from other interface -- yoshfuji */
+ if (dev->addr_len != ARCNET_ALEN)
+ return -1;
+ memset(eui, 0, 7);
+ eui[7] = *(u8 *)dev->dev_addr;
+ return 0;
+}
+
+static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
+{
+ if (dev->addr_len != INFINIBAND_ALEN)
+ return -1;
+ memcpy(eui, dev->dev_addr + 12, 8);
+ eui[0] |= 2;
+ return 0;
+}
+
+static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
+{
+ if (addr == 0)
+ return -1;
+ eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
+ ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
+ ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
+ ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
+ ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
+ ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
+ eui[1] = 0;
+ eui[2] = 0x5E;
+ eui[3] = 0xFE;
+ memcpy(eui + 4, &addr, 4);
+ return 0;
+}
+
+static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
+{
+ if (dev->priv_flags & IFF_ISATAP)
+ return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
+ return -1;
+}
+
+static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
+{
+ return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
+}
+
+static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
+{
+ memcpy(eui, dev->perm_addr, 3);
+ memcpy(eui + 5, dev->perm_addr + 3, 3);
+ eui[3] = 0xFF;
+ eui[4] = 0xFE;
+ eui[0] ^= 2;
+ return 0;
+}
+
+static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
+{
+ switch (dev->type) {
+ case ARPHRD_ETHER:
+ case ARPHRD_FDDI:
+ return addrconf_ifid_eui48(eui, dev);
+ case ARPHRD_ARCNET:
+ return addrconf_ifid_arcnet(eui, dev);
+ case ARPHRD_INFINIBAND:
+ return addrconf_ifid_infiniband(eui, dev);
+ case ARPHRD_SIT:
+ return addrconf_ifid_sit(eui, dev);
+ case ARPHRD_IPGRE:
+ return addrconf_ifid_gre(eui, dev);
+ case ARPHRD_6LOWPAN:
+ case ARPHRD_IEEE802154:
+ return addrconf_ifid_eui64(eui, dev);
+ case ARPHRD_IEEE1394:
+ return addrconf_ifid_ieee1394(eui, dev);
+ case ARPHRD_TUNNEL6:
+ return addrconf_ifid_ip6tnl(eui, dev);
+ }
+ return -1;
+}
+
+static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
+{
+ int err = -1;
+ struct inet6_ifaddr *ifp;
+
+ read_lock_bh(&idev->lock);
+ list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
+ if (ifp->scope > IFA_LINK)
+ break;
+ if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
+ memcpy(eui, ifp->addr.s6_addr+8, 8);
+ err = 0;
+ break;
+ }
+ }
+ read_unlock_bh(&idev->lock);
+ return err;
+}
+
+/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
+static void __ipv6_regen_rndid(struct inet6_dev *idev)
+{
+regen:
+ get_random_bytes(idev->rndid, sizeof(idev->rndid));
+ idev->rndid[0] &= ~0x02;
+
+ /*
+ * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
+ * check if generated address is not inappropriate
+ *
+ * - Reserved subnet anycast (RFC 2526)
+ * 11111101 11....11 1xxxxxxx
+ * - ISATAP (RFC4214) 6.1
+ * 00-00-5E-FE-xx-xx-xx-xx
+ * - value 0
+ * - XXX: already assigned to an address on the device
+ */
+ if (idev->rndid[0] == 0xfd &&
+ (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
+ (idev->rndid[7]&0x80))
+ goto regen;
+ if ((idev->rndid[0]|idev->rndid[1]) == 0) {
+ if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
+ goto regen;
+ if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
+ goto regen;
+ }
+}
+
+static void ipv6_regen_rndid(unsigned long data)
+{
+ struct inet6_dev *idev = (struct inet6_dev *) data;
+ unsigned long expires;
+
+ rcu_read_lock_bh();
+ write_lock_bh(&idev->lock);
+
+ if (idev->dead)
+ goto out;
+
+ __ipv6_regen_rndid(idev);
+
+ expires = jiffies +
+ idev->cnf.temp_prefered_lft * HZ -
+ idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
+ NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
+ idev->cnf.max_desync_factor * HZ;
+ if (time_before(expires, jiffies)) {
+ pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
+ __func__, idev->dev->name);
+ goto out;
+ }
+
+ if (!mod_timer(&idev->regen_timer, expires))
+ in6_dev_hold(idev);
+
+out:
+ write_unlock_bh(&idev->lock);
+ rcu_read_unlock_bh();
+ in6_dev_put(idev);
+}
+
+static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
+{
+ if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
+ __ipv6_regen_rndid(idev);
+}
+
+/*
+ * Add prefix route.
+ */
+
+static void
+addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
+ unsigned long expires, u32 flags)
+{
+ struct fib6_config cfg = {
+ .fc_table = RT6_TABLE_PREFIX,
+ .fc_metric = IP6_RT_PRIO_ADDRCONF,
+ .fc_ifindex = dev->ifindex,
+ .fc_expires = expires,
+ .fc_dst_len = plen,
+ .fc_flags = RTF_UP | flags,
+ .fc_nlinfo.nl_net = dev_net(dev),
+ .fc_protocol = RTPROT_KERNEL,
+ };
+
+ cfg.fc_dst = *pfx;
+
+ /* Prevent useless cloning on PtP SIT.
+ This thing is done here expecting that the whole
+ class of non-broadcast devices need not cloning.
+ */
+#if IS_ENABLED(CONFIG_IPV6_SIT)
+ if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
+ cfg.fc_flags |= RTF_NONEXTHOP;
+#endif
+
+ ip6_route_add(&cfg);
+}
+
+
+static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
+ int plen,
+ const struct net_device *dev,
+ u32 flags, u32 noflags)
+{
+ struct fib6_node *fn;
+ struct rt6_info *rt = NULL;
+ struct fib6_table *table;
+
+ table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
+ if (!table)
+ return NULL;
+
+ read_lock_bh(&table->tb6_lock);
+ fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
+ if (!fn)
+ goto out;
+ for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
+ if (rt->dst.dev->ifindex != dev->ifindex)
+ continue;
+ if ((rt->rt6i_flags & flags) != flags)
+ continue;
+ if ((rt->rt6i_flags & noflags) != 0)
+ continue;
+ dst_hold(&rt->dst);
+ break;
+ }
+out:
+ read_unlock_bh(&table->tb6_lock);
+ return rt;
+}
+
+
+/* Create "default" multicast route to the interface */
+
+static void addrconf_add_mroute(struct net_device *dev)
+{
+ struct fib6_config cfg = {
+ .fc_table = RT6_TABLE_LOCAL,
+ .fc_metric = IP6_RT_PRIO_ADDRCONF,
+ .fc_ifindex = dev->ifindex,
+ .fc_dst_len = 8,
+ .fc_flags = RTF_UP,
+ .fc_nlinfo.nl_net = dev_net(dev),
+ };
+
+ ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
+
+ ip6_route_add(&cfg);
+}
+
+static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
+{
+ struct inet6_dev *idev;
+
+ ASSERT_RTNL();
+
+ idev = ipv6_find_idev(dev);
+ if (!idev)
+ return ERR_PTR(-ENOBUFS);
+
+ if (idev->cnf.disable_ipv6)
+ return ERR_PTR(-EACCES);
+
+ /* Add default multicast route */
+ if (!(dev->flags & IFF_LOOPBACK))
+ addrconf_add_mroute(dev);
+
+ return idev;
+}
+
+static void manage_tempaddrs(struct inet6_dev *idev,
+ struct inet6_ifaddr *ifp,
+ __u32 valid_lft, __u32 prefered_lft,
+ bool create, unsigned long now)
+{
+ u32 flags;
+ struct inet6_ifaddr *ift;
+
+ read_lock_bh(&idev->lock);
+ /* update all temporary addresses in the list */
+ list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
+ int age, max_valid, max_prefered;
+
+ if (ifp != ift->ifpub)
+ continue;
+
+ /* RFC 4941 section 3.3:
+ * If a received option will extend the lifetime of a public
+ * address, the lifetimes of temporary addresses should
+ * be extended, subject to the overall constraint that no
+ * temporary addresses should ever remain "valid" or "preferred"
+ * for a time longer than (TEMP_VALID_LIFETIME) or
+ * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
+ */
+ age = (now - ift->cstamp) / HZ;
+ max_valid = idev->cnf.temp_valid_lft - age;
+ if (max_valid < 0)
+ max_valid = 0;
+
+ max_prefered = idev->cnf.temp_prefered_lft -
+ idev->cnf.max_desync_factor - age;
+ if (max_prefered < 0)
+ max_prefered = 0;
+
+ if (valid_lft > max_valid)
+ valid_lft = max_valid;
+
+ if (prefered_lft > max_prefered)
+ prefered_lft = max_prefered;
+
+ spin_lock(&ift->lock);
+ flags = ift->flags;
+ ift->valid_lft = valid_lft;
+ ift->prefered_lft = prefered_lft;
+ ift->tstamp = now;
+ if (prefered_lft > 0)
+ ift->flags &= ~IFA_F_DEPRECATED;
+
+ spin_unlock(&ift->lock);
+ if (!(flags&IFA_F_TENTATIVE))
+ ipv6_ifa_notify(0, ift);
+ }
+
+ if ((create || list_empty(&idev->tempaddr_list)) &&
+ idev->cnf.use_tempaddr > 0) {
+ /* When a new public address is created as described
+ * in [ADDRCONF], also create a new temporary address.
+ * Also create a temporary address if it's enabled but
+ * no temporary address currently exists.
+ */
+ read_unlock_bh(&idev->lock);
+ ipv6_create_tempaddr(ifp, NULL);
+ } else {
+ read_unlock_bh(&idev->lock);
+ }
+}
+
+void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
+{
+ struct prefix_info *pinfo;
+ __u32 valid_lft;
+ __u32 prefered_lft;
+ int addr_type;
+ u32 addr_flags = 0;
+ struct inet6_dev *in6_dev;
+ struct net *net = dev_net(dev);
+
+ pinfo = (struct prefix_info *) opt;
+
+ if (len < sizeof(struct prefix_info)) {
+ ADBG("addrconf: prefix option too short\n");
+ return;
+ }
+
+ /*
+ * Validation checks ([ADDRCONF], page 19)
+ */
+
+ addr_type = ipv6_addr_type(&pinfo->prefix);
+
+ if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
+ return;
+
+ valid_lft = ntohl(pinfo->valid);
+ prefered_lft = ntohl(pinfo->prefered);
+
+ if (prefered_lft > valid_lft) {
+ net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
+ return;
+ }
+
+ in6_dev = in6_dev_get(dev);
+
+ if (!in6_dev) {
+ net_dbg_ratelimited("addrconf: device %s not configured\n",
+ dev->name);
+ return;
+ }
+
+ /*
+ * Two things going on here:
+ * 1) Add routes for on-link prefixes
+ * 2) Configure prefixes with the auto flag set
+ */
+
+ if (pinfo->onlink) {
+ struct rt6_info *rt;
+ unsigned long rt_expires;
+
+ /* Avoid arithmetic overflow. Really, we could
+ * save rt_expires in seconds, likely valid_lft,
+ * but it would require division in fib gc, that it
+ * not good.
+ */
+ if (HZ > USER_HZ)
+ rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
+ else
+ rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
+
+ if (addrconf_finite_timeout(rt_expires))
+ rt_expires *= HZ;
+
+ rt = addrconf_get_prefix_route(&pinfo->prefix,
+ pinfo->prefix_len,
+ dev,
+ RTF_ADDRCONF | RTF_PREFIX_RT,
+ RTF_GATEWAY | RTF_DEFAULT);
+
+ if (rt) {
+ /* Autoconf prefix route */
+ if (valid_lft == 0) {
+ ip6_del_rt(rt);
+ rt = NULL;
+ } else if (addrconf_finite_timeout(rt_expires)) {
+ /* not infinity */
+ rt6_set_expires(rt, jiffies + rt_expires);
+ } else {
+ rt6_clean_expires(rt);
+ }
+ } else if (valid_lft) {
+ clock_t expires = 0;
+ int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
+ if (addrconf_finite_timeout(rt_expires)) {
+ /* not infinity */
+ flags |= RTF_EXPIRES;
+ expires = jiffies_to_clock_t(rt_expires);
+ }
+ addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
+ dev, expires, flags);
+ }
+ ip6_rt_put(rt);
+ }
+
+ /* Try to figure out our local address for this prefix */
+
+ if (pinfo->autoconf && in6_dev->cnf.autoconf) {
+ struct inet6_ifaddr *ifp;
+ struct in6_addr addr;
+ int create = 0, update_lft = 0;
+ bool tokenized = false;
+
+ if (pinfo->prefix_len == 64) {
+ memcpy(&addr, &pinfo->prefix, 8);
+
+ if (!ipv6_addr_any(&in6_dev->token)) {
+ read_lock_bh(&in6_dev->lock);
+ memcpy(addr.s6_addr + 8,
+ in6_dev->token.s6_addr + 8, 8);
+ read_unlock_bh(&in6_dev->lock);
+ tokenized = true;
+ } else if (in6_dev->addr_gen_mode ==
+ IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
+ !ipv6_generate_stable_address(&addr, 0,
+ in6_dev)) {
+ addr_flags |= IFA_F_STABLE_PRIVACY;
+ goto ok;
+ } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
+ ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
+ in6_dev_put(in6_dev);
+ return;
+ }
+ goto ok;
+ }
+ net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
+ pinfo->prefix_len);
+ in6_dev_put(in6_dev);
+ return;
+
+ok:
+
+ ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
+
+ if (!ifp && valid_lft) {
+ int max_addresses = in6_dev->cnf.max_addresses;
+
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+ if (in6_dev->cnf.optimistic_dad &&
+ !net->ipv6.devconf_all->forwarding && sllao)
+ addr_flags = IFA_F_OPTIMISTIC;
+#endif
+
+ /* Do not allow to create too much of autoconfigured
+ * addresses; this would be too easy way to crash kernel.
+ */
+ if (!max_addresses ||
+ ipv6_count_addresses(in6_dev) < max_addresses)
+ ifp = ipv6_add_addr(in6_dev, &addr, NULL,
+ pinfo->prefix_len,
+ addr_type&IPV6_ADDR_SCOPE_MASK,
+ addr_flags, valid_lft,
+ prefered_lft);
+
+ if (IS_ERR_OR_NULL(ifp)) {
+ in6_dev_put(in6_dev);
+ return;
+ }
+
+ update_lft = 0;
+ create = 1;
+ spin_lock_bh(&ifp->lock);
+ ifp->flags |= IFA_F_MANAGETEMPADDR;
+ ifp->cstamp = jiffies;
+ ifp->tokenized = tokenized;
+ spin_unlock_bh(&ifp->lock);
+ addrconf_dad_start(ifp);
+ }
+
+ if (ifp) {
+ u32 flags;
+ unsigned long now;
+ u32 stored_lft;
+
+ /* update lifetime (RFC2462 5.5.3 e) */
+ spin_lock_bh(&ifp->lock);
+ now = jiffies;
+ if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
+ stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
+ else
+ stored_lft = 0;
+ if (!update_lft && !create && stored_lft) {
+ const u32 minimum_lft = min_t(u32,
+ stored_lft, MIN_VALID_LIFETIME);
+ valid_lft = max(valid_lft, minimum_lft);
+
+ /* RFC4862 Section 5.5.3e:
+ * "Note that the preferred lifetime of the
+ * corresponding address is always reset to
+ * the Preferred Lifetime in the received
+ * Prefix Information option, regardless of
+ * whether the valid lifetime is also reset or
+ * ignored."
+ *
+ * So we should always update prefered_lft here.
+ */
+ update_lft = 1;
+ }
+
+ if (update_lft) {
+ ifp->valid_lft = valid_lft;
+ ifp->prefered_lft = prefered_lft;
+ ifp->tstamp = now;
+ flags = ifp->flags;
+ ifp->flags &= ~IFA_F_DEPRECATED;
+ spin_unlock_bh(&ifp->lock);
+
+ if (!(flags&IFA_F_TENTATIVE))
+ ipv6_ifa_notify(0, ifp);
+ } else
+ spin_unlock_bh(&ifp->lock);
+
+ manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
+ create, now);
+
+ in6_ifa_put(ifp);
+ addrconf_verify();
+ }
+ }
+ inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
+ in6_dev_put(in6_dev);
+}
+
+/*
+ * Set destination address.
+ * Special case for SIT interfaces where we create a new "virtual"
+ * device.
+ */
+int addrconf_set_dstaddr(struct net *net, void __user *arg)
+{
+ struct in6_ifreq ireq;
+ struct net_device *dev;
+ int err = -EINVAL;
+
+ rtnl_lock();
+
+ err = -EFAULT;
+ if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
+ goto err_exit;
+
+ dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
+
+ err = -ENODEV;
+ if (!dev)
+ goto err_exit;
+
+#if IS_ENABLED(CONFIG_IPV6_SIT)
+ if (dev->type == ARPHRD_SIT) {
+ const struct net_device_ops *ops = dev->netdev_ops;
+ struct ifreq ifr;
+ struct ip_tunnel_parm p;
+
+ err = -EADDRNOTAVAIL;
+ if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
+ goto err_exit;
+
+ memset(&p, 0, sizeof(p));
+ p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
+ p.iph.saddr = 0;
+ p.iph.version = 4;
+ p.iph.ihl = 5;
+ p.iph.protocol = IPPROTO_IPV6;
+ p.iph.ttl = 64;
+ ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
+
+ if (ops->ndo_do_ioctl) {
+ mm_segment_t oldfs = get_fs();
+
+ set_fs(KERNEL_DS);
+ err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
+ set_fs(oldfs);
+ } else
+ err = -EOPNOTSUPP;
+
+ if (err == 0) {
+ err = -ENOBUFS;
+ dev = __dev_get_by_name(net, p.name);
+ if (!dev)
+ goto err_exit;
+ err = dev_open(dev);
+ }
+ }
+#endif
+
+err_exit:
+ rtnl_unlock();
+ return err;
+}
+
+static int ipv6_mc_config(struct sock *sk, bool join,
+ const struct in6_addr *addr, int ifindex)
+{
+ int ret;
+
+ ASSERT_RTNL();
+
+ lock_sock(sk);
+ if (join)
+ ret = ipv6_sock_mc_join(sk, ifindex, addr);
+ else
+ ret = ipv6_sock_mc_drop(sk, ifindex, addr);
+ release_sock(sk);
+
+ return ret;
+}
+
+/*
+ * Manual configuration of address on an interface
+ */
+static int inet6_addr_add(struct net *net, int ifindex,
+ const struct in6_addr *pfx,
+ const struct in6_addr *peer_pfx,
+ unsigned int plen, __u32 ifa_flags,
+ __u32 prefered_lft, __u32 valid_lft)
+{
+ struct inet6_ifaddr *ifp;
+ struct inet6_dev *idev;
+ struct net_device *dev;
+ unsigned long timeout;
+ clock_t expires;
+ int scope;
+ u32 flags;
+
+ ASSERT_RTNL();
+
+ if (plen > 128)
+ return -EINVAL;
+
+ /* check the lifetime */
+ if (!valid_lft || prefered_lft > valid_lft)
+ return -EINVAL;
+
+ if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
+ return -EINVAL;
+
+ dev = __dev_get_by_index(net, ifindex);
+ if (!dev)
+ return -ENODEV;
+
+ idev = addrconf_add_dev(dev);
+ if (IS_ERR(idev))
+ return PTR_ERR(idev);
+
+ if (ifa_flags & IFA_F_MCAUTOJOIN) {
+ int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
+ true, pfx, ifindex);
+
+ if (ret < 0)
+ return ret;
+ }
+
+ scope = ipv6_addr_scope(pfx);
+
+ timeout = addrconf_timeout_fixup(valid_lft, HZ);
+ if (addrconf_finite_timeout(timeout)) {
+ expires = jiffies_to_clock_t(timeout * HZ);
+ valid_lft = timeout;
+ flags = RTF_EXPIRES;
+ } else {
+ expires = 0;
+ flags = 0;
+ ifa_flags |= IFA_F_PERMANENT;
+ }
+
+ timeout = addrconf_timeout_fixup(prefered_lft, HZ);
+ if (addrconf_finite_timeout(timeout)) {
+ if (timeout == 0)
+ ifa_flags |= IFA_F_DEPRECATED;
+ prefered_lft = timeout;
+ }
+
+ ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
+ valid_lft, prefered_lft);
+
+ if (!IS_ERR(ifp)) {
+ if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
+ addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
+ expires, flags);
+ }
+
+ /*
+ * Note that section 3.1 of RFC 4429 indicates
+ * that the Optimistic flag should not be set for
+ * manually configured addresses
+ */
+ addrconf_dad_start(ifp);
+ if (ifa_flags & IFA_F_MANAGETEMPADDR)
+ manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
+ true, jiffies);
+ in6_ifa_put(ifp);
+ addrconf_verify_rtnl();
+ return 0;
+ } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
+ ipv6_mc_config(net->ipv6.mc_autojoin_sk,
+ false, pfx, ifindex);
+ }
+
+ return PTR_ERR(ifp);
+}
+
+static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
+ const struct in6_addr *pfx, unsigned int plen)
+{
+ struct inet6_ifaddr *ifp;
+ struct inet6_dev *idev;
+ struct net_device *dev;
+
+ if (plen > 128)
+ return -EINVAL;
+
+ dev = __dev_get_by_index(net, ifindex);
+ if (!dev)
+ return -ENODEV;
+
+ idev = __in6_dev_get(dev);
+ if (!idev)
+ return -ENXIO;
+
+ read_lock_bh(&idev->lock);
+ list_for_each_entry(ifp, &idev->addr_list, if_list) {
+ if (ifp->prefix_len == plen &&
+ ipv6_addr_equal(pfx, &ifp->addr)) {
+ in6_ifa_hold(ifp);
+ read_unlock_bh(&idev->lock);
+
+ if (!(ifp->flags & IFA_F_TEMPORARY) &&
+ (ifa_flags & IFA_F_MANAGETEMPADDR))
+ manage_tempaddrs(idev, ifp, 0, 0, false,
+ jiffies);
+ ipv6_del_addr(ifp);
+ addrconf_verify_rtnl();
+ if (ipv6_addr_is_multicast(pfx)) {
+ ipv6_mc_config(net->ipv6.mc_autojoin_sk,
+ false, pfx, dev->ifindex);
+ }
+ return 0;
+ }
+ }
+ read_unlock_bh(&idev->lock);
+ return -EADDRNOTAVAIL;
+}
+
+
+int addrconf_add_ifaddr(struct net *net, void __user *arg)
+{
+ struct in6_ifreq ireq;
+ int err;
+
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ return -EPERM;
+
+ if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
+ return -EFAULT;
+
+ rtnl_lock();
+ err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
+ ireq.ifr6_prefixlen, IFA_F_PERMANENT,
+ INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
+ rtnl_unlock();
+ return err;
+}
+
+int addrconf_del_ifaddr(struct net *net, void __user *arg)
+{
+ struct in6_ifreq ireq;
+ int err;
+
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ return -EPERM;
+
+ if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
+ return -EFAULT;
+
+ rtnl_lock();
+ err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
+ ireq.ifr6_prefixlen);
+ rtnl_unlock();
+ return err;
+}
+
+static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
+ int plen, int scope)
+{
+ struct inet6_ifaddr *ifp;
+
+ ifp = ipv6_add_addr(idev, addr, NULL, plen,
+ scope, IFA_F_PERMANENT,
+ INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
+ if (!IS_ERR(ifp)) {
+ spin_lock_bh(&ifp->lock);
+ ifp->flags &= ~IFA_F_TENTATIVE;
+ spin_unlock_bh(&ifp->lock);
+ ipv6_ifa_notify(RTM_NEWADDR, ifp);
+ in6_ifa_put(ifp);
+ }
+}
+
+#if IS_ENABLED(CONFIG_IPV6_SIT)
+static void sit_add_v4_addrs(struct inet6_dev *idev)
+{
+ struct in6_addr addr;
+ struct net_device *dev;
+ struct net *net = dev_net(idev->dev);
+ int scope, plen;
+ u32 pflags = 0;
+
+ ASSERT_RTNL();
+
+ memset(&addr, 0, sizeof(struct in6_addr));
+ memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
+
+ if (idev->dev->flags&IFF_POINTOPOINT) {
+ addr.s6_addr32[0] = htonl(0xfe800000);
+ scope = IFA_LINK;
+ plen = 64;
+ } else {
+ scope = IPV6_ADDR_COMPATv4;
+ plen = 96;
+ pflags |= RTF_NONEXTHOP;
+ }
+
+ if (addr.s6_addr32[3]) {
+ add_addr(idev, &addr, plen, scope);
+ addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
+ return;
+ }
+
+ for_each_netdev(net, dev) {
+ struct in_device *in_dev = __in_dev_get_rtnl(dev);
+ if (in_dev && (dev->flags & IFF_UP)) {
+ struct in_ifaddr *ifa;
+
+ int flag = scope;
+
+ for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
+
+ addr.s6_addr32[3] = ifa->ifa_local;
+
+ if (ifa->ifa_scope == RT_SCOPE_LINK)
+ continue;
+ if (ifa->ifa_scope >= RT_SCOPE_HOST) {
+ if (idev->dev->flags&IFF_POINTOPOINT)
+ continue;
+ flag |= IFA_HOST;
+ }
+
+ add_addr(idev, &addr, plen, flag);
+ addrconf_prefix_route(&addr, plen, idev->dev, 0,
+ pflags);
+ }
+ }
+ }
+}
+#endif
+
+static void init_loopback(struct net_device *dev)
+{
+ struct inet6_dev *idev;
+ struct net_device *sp_dev;
+ struct inet6_ifaddr *sp_ifa;
+ struct rt6_info *sp_rt;
+
+ /* ::1 */
+
+ ASSERT_RTNL();
+
+ idev = ipv6_find_idev(dev);
+ if (!idev) {
+ pr_debug("%s: add_dev failed\n", __func__);
+ return;
+ }
+
+ add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
+
+ /* Add routes to other interface's IPv6 addresses */
+ for_each_netdev(dev_net(dev), sp_dev) {
+ if (!strcmp(sp_dev->name, dev->name))
+ continue;
+
+ idev = __in6_dev_get(sp_dev);
+ if (!idev)
+ continue;
+
+ read_lock_bh(&idev->lock);
+ list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
+
+ if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
+ continue;
+
+ if (sp_ifa->rt) {
+ /* This dst has been added to garbage list when
+ * lo device down, release this obsolete dst and
+ * reallocate a new router for ifa.
+ */
+ if (sp_ifa->rt->dst.obsolete > 0) {
+ ip6_rt_put(sp_ifa->rt);
+ sp_ifa->rt = NULL;
+ } else {
+ continue;
+ }
+ }
+
+ sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
+
+ /* Failure cases are ignored */
+ if (!IS_ERR(sp_rt)) {
+ sp_ifa->rt = sp_rt;
+ ip6_ins_rt(sp_rt);
+ }
+ }
+ read_unlock_bh(&idev->lock);
+ }
+}
+
+static void addrconf_add_linklocal(struct inet6_dev *idev,
+ const struct in6_addr *addr, u32 flags)
+{
+ struct inet6_ifaddr *ifp;
+ u32 addr_flags = flags | IFA_F_PERMANENT;
+
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+ if (idev->cnf.optimistic_dad &&
+ !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
+ addr_flags |= IFA_F_OPTIMISTIC;
+#endif
+
+ ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
+ INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
+ if (!IS_ERR(ifp)) {
+ addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
+ addrconf_dad_start(ifp);
+ in6_ifa_put(ifp);
+ }
+}
+
+static bool ipv6_reserved_interfaceid(struct in6_addr address)
+{
+ if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
+ return true;
+
+ if (address.s6_addr32[2] == htonl(0x02005eff) &&
+ ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
+ return true;
+
+ if (address.s6_addr32[2] == htonl(0xfdffffff) &&
+ ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
+ return true;
+
+ return false;
+}
+
+static int ipv6_generate_stable_address(struct in6_addr *address,
+ u8 dad_count,
+ const struct inet6_dev *idev)
+{
+ static DEFINE_SPINLOCK(lock);
+ static __u32 digest[SHA_DIGEST_WORDS];
+ static __u32 workspace[SHA_WORKSPACE_WORDS];
+
+ static union {
+ char __data[SHA_MESSAGE_BYTES];
+ struct {
+ struct in6_addr secret;
+ __be32 prefix[2];
+ unsigned char hwaddr[MAX_ADDR_LEN];
+ u8 dad_count;
+ } __packed;
+ } data;
+
+ struct in6_addr secret;
+ struct in6_addr temp;
+ struct net *net = dev_net(idev->dev);
+
+ BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
+
+ if (idev->cnf.stable_secret.initialized)
+ secret = idev->cnf.stable_secret.secret;
+ else if (net->ipv6.devconf_dflt->stable_secret.initialized)
+ secret = net->ipv6.devconf_dflt->stable_secret.secret;
+ else
+ return -1;
+
+retry:
+ spin_lock_bh(&lock);
+
+ sha_init(digest);
+ memset(&data, 0, sizeof(data));
+ memset(workspace, 0, sizeof(workspace));
+ memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
+ data.prefix[0] = address->s6_addr32[0];
+ data.prefix[1] = address->s6_addr32[1];
+ data.secret = secret;
+ data.dad_count = dad_count;
+
+ sha_transform(digest, data.__data, workspace);
+
+ temp = *address;
+ temp.s6_addr32[2] = (__force __be32)digest[0];
+ temp.s6_addr32[3] = (__force __be32)digest[1];
+
+ spin_unlock_bh(&lock);
+
+ if (ipv6_reserved_interfaceid(temp)) {
+ dad_count++;
+ if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
+ return -1;
+ goto retry;
+ }
+
+ *address = temp;
+ return 0;
+}
+
+static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
+{
+ struct in6_addr addr;
+
+ ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
+
+ if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
+ if (!ipv6_generate_stable_address(&addr, 0, idev))
+ addrconf_add_linklocal(idev, &addr,
+ IFA_F_STABLE_PRIVACY);
+ else if (prefix_route)
+ addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
+ } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
+ /* addrconf_add_linklocal also adds a prefix_route and we
+ * only need to care about prefix routes if ipv6_generate_eui64
+ * couldn't generate one.
+ */
+ if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
+ addrconf_add_linklocal(idev, &addr, 0);
+ else if (prefix_route)
+ addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
+ }
+}
+
+static void addrconf_dev_config(struct net_device *dev)
+{
+ struct inet6_dev *idev;
+
+ ASSERT_RTNL();
+
+ if ((dev->type != ARPHRD_ETHER) &&
+ (dev->type != ARPHRD_FDDI) &&
+ (dev->type != ARPHRD_ARCNET) &&
+ (dev->type != ARPHRD_INFINIBAND) &&
+ (dev->type != ARPHRD_IEEE802154) &&
+ (dev->type != ARPHRD_IEEE1394) &&
+ (dev->type != ARPHRD_TUNNEL6) &&
+ (dev->type != ARPHRD_6LOWPAN)) {
+ /* Alas, we support only Ethernet autoconfiguration. */
+ return;
+ }
+
+ idev = addrconf_add_dev(dev);
+ if (IS_ERR(idev))
+ return;
+
+ addrconf_addr_gen(idev, false);
+}
+
+#if IS_ENABLED(CONFIG_IPV6_SIT)
+static void addrconf_sit_config(struct net_device *dev)
+{
+ struct inet6_dev *idev;
+
+ ASSERT_RTNL();
+
+ /*
+ * Configure the tunnel with one of our IPv4
+ * addresses... we should configure all of
+ * our v4 addrs in the tunnel
+ */
+
+ idev = ipv6_find_idev(dev);
+ if (!idev) {
+ pr_debug("%s: add_dev failed\n", __func__);
+ return;
+ }
+
+ if (dev->priv_flags & IFF_ISATAP) {
+ addrconf_addr_gen(idev, false);
+ return;
+ }
+
+ sit_add_v4_addrs(idev);
+
+ if (dev->flags&IFF_POINTOPOINT)
+ addrconf_add_mroute(dev);
+}
+#endif
+
+#if IS_ENABLED(CONFIG_NET_IPGRE)
+static void addrconf_gre_config(struct net_device *dev)
+{
+ struct inet6_dev *idev;
+
+ ASSERT_RTNL();
+
+ idev = ipv6_find_idev(dev);
+ if (!idev) {
+ pr_debug("%s: add_dev failed\n", __func__);
+ return;
+ }
+
+ addrconf_addr_gen(idev, true);
+}
+#endif
+
+static int addrconf_notify(struct notifier_block *this, unsigned long event,
+ void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+ struct inet6_dev *idev = __in6_dev_get(dev);
+ int run_pending = 0;
+ int err;
+
+ switch (event) {
+ case NETDEV_REGISTER:
+ if (!idev && dev->mtu >= IPV6_MIN_MTU) {
+ idev = ipv6_add_dev(dev);
+ if (IS_ERR(idev))
+ return notifier_from_errno(PTR_ERR(idev));
+ }
+ break;
+
+ case NETDEV_UP:
+ case NETDEV_CHANGE:
+ if (dev->flags & IFF_SLAVE)
+ break;
+
+ if (idev && idev->cnf.disable_ipv6)
+ break;
+
+ if (event == NETDEV_UP) {
+ if (!addrconf_qdisc_ok(dev)) {
+ /* device is not ready yet. */
+ pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
+ dev->name);
+ break;
+ }
+
+ if (!idev && dev->mtu >= IPV6_MIN_MTU)
+ idev = ipv6_add_dev(dev);
+
+ if (!IS_ERR_OR_NULL(idev)) {
+ idev->if_flags |= IF_READY;
+ run_pending = 1;
+ }
+ } else {
+ if (!addrconf_qdisc_ok(dev)) {
+ /* device is still not ready. */
+ break;
+ }
+
+ if (idev) {
+ if (idev->if_flags & IF_READY)
+ /* device is already configured. */
+ break;
+ idev->if_flags |= IF_READY;
+ }
+
+ pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
+ dev->name);
+
+ run_pending = 1;
+ }
+
+ switch (dev->type) {
+#if IS_ENABLED(CONFIG_IPV6_SIT)
+ case ARPHRD_SIT:
+ addrconf_sit_config(dev);
+ break;
+#endif
+#if IS_ENABLED(CONFIG_NET_IPGRE)
+ case ARPHRD_IPGRE:
+ addrconf_gre_config(dev);
+ break;
+#endif
+ case ARPHRD_LOOPBACK:
+ init_loopback(dev);
+ break;
+
+ default:
+ addrconf_dev_config(dev);
+ break;
+ }
+
+ if (!IS_ERR_OR_NULL(idev)) {
+ if (run_pending)
+ addrconf_dad_run(idev);
+
+ /*
+ * If the MTU changed during the interface down,
+ * when the interface up, the changed MTU must be
+ * reflected in the idev as well as routers.
+ */
+ if (idev->cnf.mtu6 != dev->mtu &&
+ dev->mtu >= IPV6_MIN_MTU) {
+ rt6_mtu_change(dev, dev->mtu);
+ idev->cnf.mtu6 = dev->mtu;
+ }
+ idev->tstamp = jiffies;
+ inet6_ifinfo_notify(RTM_NEWLINK, idev);
+
+ /*
+ * If the changed mtu during down is lower than
+ * IPV6_MIN_MTU stop IPv6 on this interface.
+ */
+ if (dev->mtu < IPV6_MIN_MTU)
+ addrconf_ifdown(dev, 1);
+ }
+ break;
+
+ case NETDEV_CHANGEMTU:
+ if (idev && dev->mtu >= IPV6_MIN_MTU) {
+ rt6_mtu_change(dev, dev->mtu);
+ idev->cnf.mtu6 = dev->mtu;
+ break;
+ }
+
+ if (!idev && dev->mtu >= IPV6_MIN_MTU) {
+ idev = ipv6_add_dev(dev);
+ if (!IS_ERR(idev))
+ break;
+ }
+
+ /*
+ * if MTU under IPV6_MIN_MTU.
+ * Stop IPv6 on this interface.
+ */
+
+ case NETDEV_DOWN:
+ case NETDEV_UNREGISTER:
+ /*
+ * Remove all addresses from this interface.
+ */
+ addrconf_ifdown(dev, event != NETDEV_DOWN);
+ break;
+
+ case NETDEV_CHANGENAME:
+ if (idev) {
+ snmp6_unregister_dev(idev);
+ addrconf_sysctl_unregister(idev);
+ err = addrconf_sysctl_register(idev);
+ if (err)
+ return notifier_from_errno(err);
+ err = snmp6_register_dev(idev);
+ if (err) {
+ addrconf_sysctl_unregister(idev);
+ return notifier_from_errno(err);
+ }
+ }
+ break;
+
+ case NETDEV_PRE_TYPE_CHANGE:
+ case NETDEV_POST_TYPE_CHANGE:
+ addrconf_type_change(dev, event);
+ break;
+ }
+
+ return NOTIFY_OK;
+}
+
+/*
+ * addrconf module should be notified of a device going up
+ */
+static struct notifier_block ipv6_dev_notf = {
+ .notifier_call = addrconf_notify,
+};
+
+static void addrconf_type_change(struct net_device *dev, unsigned long event)
+{
+ struct inet6_dev *idev;
+ ASSERT_RTNL();
+
+ idev = __in6_dev_get(dev);
+
+ if (event == NETDEV_POST_TYPE_CHANGE)
+ ipv6_mc_remap(idev);
+ else if (event == NETDEV_PRE_TYPE_CHANGE)
+ ipv6_mc_unmap(idev);
+}
+
+static int addrconf_ifdown(struct net_device *dev, int how)
+{
+ struct net *net = dev_net(dev);
+ struct inet6_dev *idev;
+ struct inet6_ifaddr *ifa;
+ int state, i;
+
+ ASSERT_RTNL();
+
+ rt6_ifdown(net, dev);
+ neigh_ifdown(&nd_tbl, dev);
+
+ idev = __in6_dev_get(dev);
+ if (!idev)
+ return -ENODEV;
+
+ /*
+ * Step 1: remove reference to ipv6 device from parent device.
+ * Do not dev_put!
+ */
+ if (how) {
+ idev->dead = 1;
+
+ /* protected by rtnl_lock */
+ RCU_INIT_POINTER(dev->ip6_ptr, NULL);
+
+ /* Step 1.5: remove snmp6 entry */
+ snmp6_unregister_dev(idev);
+
+ }
+
+ /* Step 2: clear hash table */
+ for (i = 0; i < IN6_ADDR_HSIZE; i++) {
+ struct hlist_head *h = &inet6_addr_lst[i];
+
+ spin_lock_bh(&addrconf_hash_lock);
+restart:
+ hlist_for_each_entry_rcu(ifa, h, addr_lst) {
+ if (ifa->idev == idev) {
+ hlist_del_init_rcu(&ifa->addr_lst);
+ addrconf_del_dad_work(ifa);
+ goto restart;
+ }
+ }
+ spin_unlock_bh(&addrconf_hash_lock);
+ }
+
+ write_lock_bh(&idev->lock);
+
+ addrconf_del_rs_timer(idev);
+
+ /* Step 2: clear flags for stateless addrconf */
+ if (!how)
+ idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
+
+ if (how && del_timer(&idev->regen_timer))
+ in6_dev_put(idev);
+
+ /* Step 3: clear tempaddr list */
+ while (!list_empty(&idev->tempaddr_list)) {
+ ifa = list_first_entry(&idev->tempaddr_list,
+ struct inet6_ifaddr, tmp_list);
+ list_del(&ifa->tmp_list);
+ write_unlock_bh(&idev->lock);
+ spin_lock_bh(&ifa->lock);
+
+ if (ifa->ifpub) {
+ in6_ifa_put(ifa->ifpub);
+ ifa->ifpub = NULL;
+ }
+ spin_unlock_bh(&ifa->lock);
+ in6_ifa_put(ifa);
+ write_lock_bh(&idev->lock);
+ }
+
+ while (!list_empty(&idev->addr_list)) {
+ ifa = list_first_entry(&idev->addr_list,
+ struct inet6_ifaddr, if_list);
+ addrconf_del_dad_work(ifa);
+
+ list_del(&ifa->if_list);
+
+ write_unlock_bh(&idev->lock);
+
+ spin_lock_bh(&ifa->lock);
+ state = ifa->state;
+ ifa->state = INET6_IFADDR_STATE_DEAD;
+ spin_unlock_bh(&ifa->lock);
+
+ if (state != INET6_IFADDR_STATE_DEAD) {
+ __ipv6_ifa_notify(RTM_DELADDR, ifa);
+ inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
+ }
+ in6_ifa_put(ifa);
+
+ write_lock_bh(&idev->lock);
+ }
+
+ write_unlock_bh(&idev->lock);
+
+ /* Step 5: Discard anycast and multicast list */
+ if (how) {
+ ipv6_ac_destroy_dev(idev);
+ ipv6_mc_destroy_dev(idev);
+ } else {
+ ipv6_mc_down(idev);
+ }
+
+ idev->tstamp = jiffies;
+
+ /* Last: Shot the device (if unregistered) */
+ if (how) {
+ addrconf_sysctl_unregister(idev);
+ neigh_parms_release(&nd_tbl, idev->nd_parms);
+ neigh_ifdown(&nd_tbl, dev);
+ in6_dev_put(idev);
+ }
+ return 0;
+}
+
+static void addrconf_rs_timer(unsigned long data)
+{
+ struct inet6_dev *idev = (struct inet6_dev *)data;
+ struct net_device *dev = idev->dev;
+ struct in6_addr lladdr;
+
+ write_lock(&idev->lock);
+ if (idev->dead || !(idev->if_flags & IF_READY))
+ goto out;
+
+ if (!ipv6_accept_ra(idev))
+ goto out;
+
+ /* Announcement received after solicitation was sent */
+ if (idev->if_flags & IF_RA_RCVD)
+ goto out;
+
+ if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
+ write_unlock(&idev->lock);
+ if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
+ ndisc_send_rs(dev, &lladdr,
+ &in6addr_linklocal_allrouters);
+ else
+ goto put;
+
+ write_lock(&idev->lock);
+ /* The wait after the last probe can be shorter */
+ addrconf_mod_rs_timer(idev, (idev->rs_probes ==
+ idev->cnf.rtr_solicits) ?
+ idev->cnf.rtr_solicit_delay :
+ idev->cnf.rtr_solicit_interval);
+ } else {
+ /*
+ * Note: we do not support deprecated "all on-link"
+ * assumption any longer.
+ */
+ pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
+ }
+
+out:
+ write_unlock(&idev->lock);
+put:
+ in6_dev_put(idev);
+}
+
+/*
+ * Duplicate Address Detection
+ */
+static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
+{
+ unsigned long rand_num;
+ struct inet6_dev *idev = ifp->idev;
+
+ if (ifp->flags & IFA_F_OPTIMISTIC)
+ rand_num = 0;
+ else
+ rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
+
+ ifp->dad_probes = idev->cnf.dad_transmits;
+ addrconf_mod_dad_work(ifp, rand_num);
+}
+
+static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
+{
+ struct inet6_dev *idev = ifp->idev;
+ struct net_device *dev = idev->dev;
+
+ addrconf_join_solict(dev, &ifp->addr);
+
+ prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
+
+ read_lock_bh(&idev->lock);
+ spin_lock(&ifp->lock);
+ if (ifp->state == INET6_IFADDR_STATE_DEAD)
+ goto out;
+
+ if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
+ idev->cnf.accept_dad < 1 ||
+ !(ifp->flags&IFA_F_TENTATIVE) ||
+ ifp->flags & IFA_F_NODAD) {
+ ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
+ spin_unlock(&ifp->lock);
+ read_unlock_bh(&idev->lock);
+
+ addrconf_dad_completed(ifp);
+ return;
+ }
+
+ if (!(idev->if_flags & IF_READY)) {
+ spin_unlock(&ifp->lock);
+ read_unlock_bh(&idev->lock);
+ /*
+ * If the device is not ready:
+ * - keep it tentative if it is a permanent address.
+ * - otherwise, kill it.
+ */
+ in6_ifa_hold(ifp);
+ addrconf_dad_stop(ifp, 0);
+ return;
+ }
+
+ /*
+ * Optimistic nodes can start receiving
+ * Frames right away
+ */
+ if (ifp->flags & IFA_F_OPTIMISTIC) {
+ ip6_ins_rt(ifp->rt);
+ if (ipv6_use_optimistic_addr(idev)) {
+ /* Because optimistic nodes can use this address,
+ * notify listeners. If DAD fails, RTM_DELADDR is sent.
+ */
+ ipv6_ifa_notify(RTM_NEWADDR, ifp);
+ }
+ }
+
+ addrconf_dad_kick(ifp);
+out:
+ spin_unlock(&ifp->lock);
+ read_unlock_bh(&idev->lock);
+}
+
+static void addrconf_dad_start(struct inet6_ifaddr *ifp)
+{
+ bool begin_dad = false;
+
+ spin_lock_bh(&ifp->lock);
+ if (ifp->state != INET6_IFADDR_STATE_DEAD) {
+ ifp->state = INET6_IFADDR_STATE_PREDAD;
+ begin_dad = true;
+ }
+ spin_unlock_bh(&ifp->lock);
+
+ if (begin_dad)
+ addrconf_mod_dad_work(ifp, 0);
+}
+
+static void addrconf_dad_work(struct work_struct *w)
+{
+ struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
+ struct inet6_ifaddr,
+ dad_work);
+ struct inet6_dev *idev = ifp->idev;
+ struct in6_addr mcaddr;
+
+ enum {
+ DAD_PROCESS,
+ DAD_BEGIN,
+ DAD_ABORT,
+ } action = DAD_PROCESS;
+
+ rtnl_lock();
+
+ spin_lock_bh(&ifp->lock);
+ if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
+ action = DAD_BEGIN;
+ ifp->state = INET6_IFADDR_STATE_DAD;
+ } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
+ action = DAD_ABORT;
+ ifp->state = INET6_IFADDR_STATE_POSTDAD;
+ }
+ spin_unlock_bh(&ifp->lock);
+
+ if (action == DAD_BEGIN) {
+ addrconf_dad_begin(ifp);
+ goto out;
+ } else if (action == DAD_ABORT) {
+ addrconf_dad_stop(ifp, 1);
+ goto out;
+ }
+
+ if (!ifp->dad_probes && addrconf_dad_end(ifp))
+ goto out;
+
+ write_lock_bh(&idev->lock);
+ if (idev->dead || !(idev->if_flags & IF_READY)) {
+ write_unlock_bh(&idev->lock);
+ goto out;
+ }
+
+ spin_lock(&ifp->lock);
+ if (ifp->state == INET6_IFADDR_STATE_DEAD) {
+ spin_unlock(&ifp->lock);
+ write_unlock_bh(&idev->lock);
+ goto out;
+ }
+
+ if (ifp->dad_probes == 0) {
+ /*
+ * DAD was successful
+ */
+
+ ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
+ spin_unlock(&ifp->lock);
+ write_unlock_bh(&idev->lock);
+
+ addrconf_dad_completed(ifp);
+
+ goto out;
+ }
+
+ ifp->dad_probes--;
+ addrconf_mod_dad_work(ifp,
+ NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
+ spin_unlock(&ifp->lock);
+ write_unlock_bh(&idev->lock);
+
+ /* send a neighbour solicitation for our addr */
+ addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
+ ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
+out:
+ in6_ifa_put(ifp);
+ rtnl_unlock();
+}
+
+/* ifp->idev must be at least read locked */
+static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
+{
+ struct inet6_ifaddr *ifpiter;
+ struct inet6_dev *idev = ifp->idev;
+
+ list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
+ if (ifpiter->scope > IFA_LINK)
+ break;
+ if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
+ (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
+ IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
+ IFA_F_PERMANENT)
+ return false;
+ }
+ return true;
+}
+
+static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
+{
+ struct net_device *dev = ifp->idev->dev;
+ struct in6_addr lladdr;
+ bool send_rs, send_mld;
+
+ addrconf_del_dad_work(ifp);
+
+ /*
+ * Configure the address for reception. Now it is valid.
+ */
+
+ ipv6_ifa_notify(RTM_NEWADDR, ifp);
+
+ /* If added prefix is link local and we are prepared to process
+ router advertisements, start sending router solicitations.
+ */
+
+ read_lock_bh(&ifp->idev->lock);
+ send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
+ send_rs = send_mld &&
+ ipv6_accept_ra(ifp->idev) &&
+ ifp->idev->cnf.rtr_solicits > 0 &&
+ (dev->flags&IFF_LOOPBACK) == 0;
+ read_unlock_bh(&ifp->idev->lock);
+
+ /* While dad is in progress mld report's source address is in6_addrany.
+ * Resend with proper ll now.
+ */
+ if (send_mld)
+ ipv6_mc_dad_complete(ifp->idev);
+
+ if (send_rs) {
+ /*
+ * If a host as already performed a random delay
+ * [...] as part of DAD [...] there is no need
+ * to delay again before sending the first RS
+ */
+ if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
+ return;
+ ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
+
+ write_lock_bh(&ifp->idev->lock);
+ spin_lock(&ifp->lock);
+ ifp->idev->rs_probes = 1;
+ ifp->idev->if_flags |= IF_RS_SENT;
+ addrconf_mod_rs_timer(ifp->idev,
+ ifp->idev->cnf.rtr_solicit_interval);
+ spin_unlock(&ifp->lock);
+ write_unlock_bh(&ifp->idev->lock);
+ }
+}
+
+static void addrconf_dad_run(struct inet6_dev *idev)
+{
+ struct inet6_ifaddr *ifp;
+
+ read_lock_bh(&idev->lock);
+ list_for_each_entry(ifp, &idev->addr_list, if_list) {
+ spin_lock(&ifp->lock);
+ if (ifp->flags & IFA_F_TENTATIVE &&
+ ifp->state == INET6_IFADDR_STATE_DAD)
+ addrconf_dad_kick(ifp);
+ spin_unlock(&ifp->lock);
+ }
+ read_unlock_bh(&idev->lock);
+}
+
+#ifdef CONFIG_PROC_FS
+struct if6_iter_state {
+ struct seq_net_private p;
+ int bucket;
+ int offset;
+};
+
+static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
+{
+ struct inet6_ifaddr *ifa = NULL;
+ struct if6_iter_state *state = seq->private;
+ struct net *net = seq_file_net(seq);
+ int p = 0;
+
+ /* initial bucket if pos is 0 */
+ if (pos == 0) {
+ state->bucket = 0;
+ state->offset = 0;
+ }
+
+ for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
+ hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
+ addr_lst) {
+ if (!net_eq(dev_net(ifa->idev->dev), net))
+ continue;
+ /* sync with offset */
+ if (p < state->offset) {
+ p++;
+ continue;
+ }
+ state->offset++;
+ return ifa;
+ }
+
+ /* prepare for next bucket */
+ state->offset = 0;
+ p = 0;
+ }
+ return NULL;
+}
+
+static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
+ struct inet6_ifaddr *ifa)
+{
+ struct if6_iter_state *state = seq->private;
+ struct net *net = seq_file_net(seq);
+
+ hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
+ if (!net_eq(dev_net(ifa->idev->dev), net))
+ continue;
+ state->offset++;
+ return ifa;
+ }
+
+ while (++state->bucket < IN6_ADDR_HSIZE) {
+ state->offset = 0;
+ hlist_for_each_entry_rcu_bh(ifa,
+ &inet6_addr_lst[state->bucket], addr_lst) {
+ if (!net_eq(dev_net(ifa->idev->dev), net))
+ continue;
+ state->offset++;
+ return ifa;
+ }
+ }
+
+ return NULL;
+}
+
+static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
+ __acquires(rcu_bh)
+{
+ rcu_read_lock_bh();
+ return if6_get_first(seq, *pos);
+}
+
+static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ struct inet6_ifaddr *ifa;
+
+ ifa = if6_get_next(seq, v);
+ ++*pos;
+ return ifa;
+}
+
+static void if6_seq_stop(struct seq_file *seq, void *v)
+ __releases(rcu_bh)
+{
+ rcu_read_unlock_bh();
+}
+
+static int if6_seq_show(struct seq_file *seq, void *v)
+{
+ struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
+ seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
+ &ifp->addr,
+ ifp->idev->dev->ifindex,
+ ifp->prefix_len,
+ ifp->scope,
+ (u8) ifp->flags,
+ ifp->idev->dev->name);
+ return 0;
+}
+
+static const struct seq_operations if6_seq_ops = {
+ .start = if6_seq_start,
+ .next = if6_seq_next,
+ .show = if6_seq_show,
+ .stop = if6_seq_stop,
+};
+
+static int if6_seq_open(struct inode *inode, struct file *file)
+{
+ return seq_open_net(inode, file, &if6_seq_ops,
+ sizeof(struct if6_iter_state));
+}
+
+static const struct file_operations if6_fops = {
+ .owner = THIS_MODULE,
+ .open = if6_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release_net,
+};
+
+static int __net_init if6_proc_net_init(struct net *net)
+{
+ if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
+ return -ENOMEM;
+ return 0;
+}
+
+static void __net_exit if6_proc_net_exit(struct net *net)
+{
+ remove_proc_entry("if_inet6", net->proc_net);
+}
+
+static struct pernet_operations if6_proc_net_ops = {
+ .init = if6_proc_net_init,
+ .exit = if6_proc_net_exit,
+};
+
+int __init if6_proc_init(void)
+{
+ return register_pernet_subsys(&if6_proc_net_ops);
+}
+
+void if6_proc_exit(void)
+{
+ unregister_pernet_subsys(&if6_proc_net_ops);
+}
+#endif /* CONFIG_PROC_FS */
+
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+/* Check if address is a home address configured on any interface. */
+int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
+{
+ int ret = 0;
+ struct inet6_ifaddr *ifp = NULL;
+ unsigned int hash = inet6_addr_hash(addr);
+
+ rcu_read_lock_bh();
+ hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
+ if (!net_eq(dev_net(ifp->idev->dev), net))
+ continue;
+ if (ipv6_addr_equal(&ifp->addr, addr) &&
+ (ifp->flags & IFA_F_HOMEADDRESS)) {
+ ret = 1;
+ break;
+ }
+ }
+ rcu_read_unlock_bh();
+ return ret;
+}
+#endif
+
+/*
+ * Periodic address status verification
+ */
+
+static void addrconf_verify_rtnl(void)
+{
+ unsigned long now, next, next_sec, next_sched;
+ struct inet6_ifaddr *ifp;
+ int i;
+
+ ASSERT_RTNL();
+
+ rcu_read_lock_bh();
+ now = jiffies;
+ next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
+
+ cancel_delayed_work(&addr_chk_work);
+
+ for (i = 0; i < IN6_ADDR_HSIZE; i++) {
+restart:
+ hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
+ unsigned long age;
+
+ /* When setting preferred_lft to a value not zero or
+ * infinity, while valid_lft is infinity
+ * IFA_F_PERMANENT has a non-infinity life time.
+ */
+ if ((ifp->flags & IFA_F_PERMANENT) &&
+ (ifp->prefered_lft == INFINITY_LIFE_TIME))
+ continue;
+
+ spin_lock(&ifp->lock);
+ /* We try to batch several events at once. */
+ age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
+
+ if (ifp->valid_lft != INFINITY_LIFE_TIME &&
+ age >= ifp->valid_lft) {
+ spin_unlock(&ifp->lock);
+ in6_ifa_hold(ifp);
+ ipv6_del_addr(ifp);
+ goto restart;
+ } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
+ spin_unlock(&ifp->lock);
+ continue;
+ } else if (age >= ifp->prefered_lft) {
+ /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
+ int deprecate = 0;
+
+ if (!(ifp->flags&IFA_F_DEPRECATED)) {
+ deprecate = 1;
+ ifp->flags |= IFA_F_DEPRECATED;
+ }
+
+ if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
+ (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
+ next = ifp->tstamp + ifp->valid_lft * HZ;
+
+ spin_unlock(&ifp->lock);
+
+ if (deprecate) {
+ in6_ifa_hold(ifp);
+
+ ipv6_ifa_notify(0, ifp);
+ in6_ifa_put(ifp);
+ goto restart;
+ }
+ } else if ((ifp->flags&IFA_F_TEMPORARY) &&
+ !(ifp->flags&IFA_F_TENTATIVE)) {
+ unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
+ ifp->idev->cnf.dad_transmits *
+ NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
+
+ if (age >= ifp->prefered_lft - regen_advance) {
+ struct inet6_ifaddr *ifpub = ifp->ifpub;
+ if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
+ next = ifp->tstamp + ifp->prefered_lft * HZ;
+ if (!ifp->regen_count && ifpub) {
+ ifp->regen_count++;
+ in6_ifa_hold(ifp);
+ in6_ifa_hold(ifpub);
+ spin_unlock(&ifp->lock);
+
+ spin_lock(&ifpub->lock);
+ ifpub->regen_count = 0;
+ spin_unlock(&ifpub->lock);
+ ipv6_create_tempaddr(ifpub, ifp);
+ in6_ifa_put(ifpub);
+ in6_ifa_put(ifp);
+ goto restart;
+ }
+ } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
+ next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
+ spin_unlock(&ifp->lock);
+ } else {
+ /* ifp->prefered_lft <= ifp->valid_lft */
+ if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
+ next = ifp->tstamp + ifp->prefered_lft * HZ;
+ spin_unlock(&ifp->lock);
+ }
+ }
+ }
+
+ next_sec = round_jiffies_up(next);
+ next_sched = next;
+
+ /* If rounded timeout is accurate enough, accept it. */
+ if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
+ next_sched = next_sec;
+
+ /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
+ if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
+ next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
+
+ ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
+ now, next, next_sec, next_sched);
+ mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
+ rcu_read_unlock_bh();
+}
+
+static void addrconf_verify_work(struct work_struct *w)
+{
+ rtnl_lock();
+ addrconf_verify_rtnl();
+ rtnl_unlock();
+}
+
+static void addrconf_verify(void)
+{
+ mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
+}
+
+static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
+ struct in6_addr **peer_pfx)
+{
+ struct in6_addr *pfx = NULL;
+
+ *peer_pfx = NULL;
+
+ if (addr)
+ pfx = nla_data(addr);
+
+ if (local) {
+ if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
+ *peer_pfx = pfx;
+ pfx = nla_data(local);
+ }
+
+ return pfx;
+}
+
+static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
+ [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
+ [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
+ [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
+ [IFA_FLAGS] = { .len = sizeof(u32) },
+};
+
+static int
+inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+ struct net *net = sock_net(skb->sk);
+ struct ifaddrmsg *ifm;
+ struct nlattr *tb[IFA_MAX+1];
+ struct in6_addr *pfx, *peer_pfx;
+ u32 ifa_flags;
+ int err;
+
+ err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
+ if (err < 0)
+ return err;
+
+ ifm = nlmsg_data(nlh);
+ pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
+ if (!pfx)
+ return -EINVAL;
+
+ ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
+
+ /* We ignore other flags so far. */
+ ifa_flags &= IFA_F_MANAGETEMPADDR;
+
+ return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
+ ifm->ifa_prefixlen);
+}
+
+static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
+ u32 prefered_lft, u32 valid_lft)
+{
+ u32 flags;
+ clock_t expires;
+ unsigned long timeout;
+ bool was_managetempaddr;
+ bool had_prefixroute;
+
+ ASSERT_RTNL();
+
+ if (!valid_lft || (prefered_lft > valid_lft))
+ return -EINVAL;
+
+ if (ifa_flags & IFA_F_MANAGETEMPADDR &&
+ (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
+ return -EINVAL;
+
+ timeout = addrconf_timeout_fixup(valid_lft, HZ);
+ if (addrconf_finite_timeout(timeout)) {
+ expires = jiffies_to_clock_t(timeout * HZ);
+ valid_lft = timeout;
+ flags = RTF_EXPIRES;
+ } else {
+ expires = 0;
+ flags = 0;
+ ifa_flags |= IFA_F_PERMANENT;
+ }
+
+ timeout = addrconf_timeout_fixup(prefered_lft, HZ);
+ if (addrconf_finite_timeout(timeout)) {
+ if (timeout == 0)
+ ifa_flags |= IFA_F_DEPRECATED;
+ prefered_lft = timeout;
+ }
+
+ spin_lock_bh(&ifp->lock);
+ was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
+ had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
+ !(ifp->flags & IFA_F_NOPREFIXROUTE);
+ ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
+ IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
+ IFA_F_NOPREFIXROUTE);
+ ifp->flags |= ifa_flags;
+ ifp->tstamp = jiffies;
+ ifp->valid_lft = valid_lft;
+ ifp->prefered_lft = prefered_lft;
+
+ spin_unlock_bh(&ifp->lock);
+ if (!(ifp->flags&IFA_F_TENTATIVE))
+ ipv6_ifa_notify(0, ifp);
+
+ if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
+ addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
+ expires, flags);
+ } else if (had_prefixroute) {
+ enum cleanup_prefix_rt_t action;
+ unsigned long rt_expires;
+
+ write_lock_bh(&ifp->idev->lock);
+ action = check_cleanup_prefix_route(ifp, &rt_expires);
+ write_unlock_bh(&ifp->idev->lock);
+
+ if (action != CLEANUP_PREFIX_RT_NOP) {
+ cleanup_prefix_route(ifp, rt_expires,
+ action == CLEANUP_PREFIX_RT_DEL);
+ }
+ }
+
+ if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
+ if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
+ valid_lft = prefered_lft = 0;
+ manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
+ !was_managetempaddr, jiffies);
+ }
+
+ addrconf_verify_rtnl();
+
+ return 0;
+}
+
+static int
+inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+ struct net *net = sock_net(skb->sk);
+ struct ifaddrmsg *ifm;
+ struct nlattr *tb[IFA_MAX+1];
+ struct in6_addr *pfx, *peer_pfx;
+ struct inet6_ifaddr *ifa;
+ struct net_device *dev;
+ u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
+ u32 ifa_flags;
+ int err;
+
+ err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
+ if (err < 0)
+ return err;
+
+ ifm = nlmsg_data(nlh);
+ pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
+ if (!pfx)
+ return -EINVAL;
+
+ if (tb[IFA_CACHEINFO]) {
+ struct ifa_cacheinfo *ci;
+
+ ci = nla_data(tb[IFA_CACHEINFO]);
+ valid_lft = ci->ifa_valid;
+ preferred_lft = ci->ifa_prefered;
+ } else {
+ preferred_lft = INFINITY_LIFE_TIME;
+ valid_lft = INFINITY_LIFE_TIME;
+ }
+
+ dev = __dev_get_by_index(net, ifm->ifa_index);
+ if (!dev)
+ return -ENODEV;
+
+ ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
+
+ /* We ignore other flags so far. */
+ ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
+ IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
+
+ ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
+ if (!ifa) {
+ /*
+ * It would be best to check for !NLM_F_CREATE here but
+ * userspace already relies on not having to provide this.
+ */
+ return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
+ ifm->ifa_prefixlen, ifa_flags,
+ preferred_lft, valid_lft);
+ }
+
+ if (nlh->nlmsg_flags & NLM_F_EXCL ||
+ !(nlh->nlmsg_flags & NLM_F_REPLACE))
+ err = -EEXIST;
+ else
+ err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
+
+ in6_ifa_put(ifa);
+
+ return err;
+}
+
+static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
+ u8 scope, int ifindex)
+{
+ struct ifaddrmsg *ifm;
+
+ ifm = nlmsg_data(nlh);
+ ifm->ifa_family = AF_INET6;
+ ifm->ifa_prefixlen = prefixlen;
+ ifm->ifa_flags = flags;
+ ifm->ifa_scope = scope;
+ ifm->ifa_index = ifindex;
+}
+
+static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
+ unsigned long tstamp, u32 preferred, u32 valid)
+{
+ struct ifa_cacheinfo ci;
+
+ ci.cstamp = cstamp_delta(cstamp);
+ ci.tstamp = cstamp_delta(tstamp);
+ ci.ifa_prefered = preferred;
+ ci.ifa_valid = valid;
+
+ return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
+}
+
+static inline int rt_scope(int ifa_scope)
+{
+ if (ifa_scope & IFA_HOST)
+ return RT_SCOPE_HOST;
+ else if (ifa_scope & IFA_LINK)
+ return RT_SCOPE_LINK;
+ else if (ifa_scope & IFA_SITE)
+ return RT_SCOPE_SITE;
+ else
+ return RT_SCOPE_UNIVERSE;
+}
+
+static inline int inet6_ifaddr_msgsize(void)
+{
+ return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
+ + nla_total_size(16) /* IFA_LOCAL */
+ + nla_total_size(16) /* IFA_ADDRESS */
+ + nla_total_size(sizeof(struct ifa_cacheinfo))
+ + nla_total_size(4) /* IFA_FLAGS */;
+}
+
+static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
+ u32 portid, u32 seq, int event, unsigned int flags)
+{
+ struct nlmsghdr *nlh;
+ u32 preferred, valid;
+
+ nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
+ ifa->idev->dev->ifindex);
+
+ if (!((ifa->flags&IFA_F_PERMANENT) &&
+ (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
+ preferred = ifa->prefered_lft;
+ valid = ifa->valid_lft;
+ if (preferred != INFINITY_LIFE_TIME) {
+ long tval = (jiffies - ifa->tstamp)/HZ;
+ if (preferred > tval)
+ preferred -= tval;
+ else
+ preferred = 0;
+ if (valid != INFINITY_LIFE_TIME) {
+ if (valid > tval)
+ valid -= tval;
+ else
+ valid = 0;
+ }
+ }
+ } else {
+ preferred = INFINITY_LIFE_TIME;
+ valid = INFINITY_LIFE_TIME;
+ }
+
+ if (!ipv6_addr_any(&ifa->peer_addr)) {
+ if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
+ nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
+ goto error;
+ } else
+ if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
+ goto error;
+
+ if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
+ goto error;
+
+ if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
+ goto error;
+
+ nlmsg_end(skb, nlh);
+ return 0;
+
+error:
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+}
+
+static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
+ u32 portid, u32 seq, int event, u16 flags)
+{
+ struct nlmsghdr *nlh;
+ u8 scope = RT_SCOPE_UNIVERSE;
+ int ifindex = ifmca->idev->dev->ifindex;
+
+ if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
+ scope = RT_SCOPE_SITE;
+
+ nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
+ if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
+ put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
+ INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+ }
+
+ nlmsg_end(skb, nlh);
+ return 0;
+}
+
+static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
+ u32 portid, u32 seq, int event, unsigned int flags)
+{
+ struct nlmsghdr *nlh;
+ u8 scope = RT_SCOPE_UNIVERSE;
+ int ifindex = ifaca->aca_idev->dev->ifindex;
+
+ if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
+ scope = RT_SCOPE_SITE;
+
+ nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
+ if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
+ put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
+ INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+ }
+
+ nlmsg_end(skb, nlh);
+ return 0;
+}
+
+enum addr_type_t {
+ UNICAST_ADDR,
+ MULTICAST_ADDR,
+ ANYCAST_ADDR,
+};
+
+/* called with rcu_read_lock() */
+static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
+ struct netlink_callback *cb, enum addr_type_t type,
+ int s_ip_idx, int *p_ip_idx)
+{
+ struct ifmcaddr6 *ifmca;
+ struct ifacaddr6 *ifaca;
+ int err = 1;
+ int ip_idx = *p_ip_idx;
+
+ read_lock_bh(&idev->lock);
+ switch (type) {
+ case UNICAST_ADDR: {
+ struct inet6_ifaddr *ifa;
+
+ /* unicast address incl. temp addr */
+ list_for_each_entry(ifa, &idev->addr_list, if_list) {
+ if (++ip_idx < s_ip_idx)
+ continue;
+ err = inet6_fill_ifaddr(skb, ifa,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ RTM_NEWADDR,
+ NLM_F_MULTI);
+ if (err < 0)
+ break;
+ nl_dump_check_consistent(cb, nlmsg_hdr(skb));
+ }
+ break;
+ }
+ case MULTICAST_ADDR:
+ /* multicast address */
+ for (ifmca = idev->mc_list; ifmca;
+ ifmca = ifmca->next, ip_idx++) {
+ if (ip_idx < s_ip_idx)
+ continue;
+ err = inet6_fill_ifmcaddr(skb, ifmca,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ RTM_GETMULTICAST,
+ NLM_F_MULTI);
+ if (err < 0)
+ break;
+ }
+ break;
+ case ANYCAST_ADDR:
+ /* anycast address */
+ for (ifaca = idev->ac_list; ifaca;
+ ifaca = ifaca->aca_next, ip_idx++) {
+ if (ip_idx < s_ip_idx)
+ continue;
+ err = inet6_fill_ifacaddr(skb, ifaca,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ RTM_GETANYCAST,
+ NLM_F_MULTI);
+ if (err < 0)
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+ read_unlock_bh(&idev->lock);
+ *p_ip_idx = ip_idx;
+ return err;
+}
+
+static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
+ enum addr_type_t type)
+{
+ struct net *net = sock_net(skb->sk);
+ int h, s_h;
+ int idx, ip_idx;
+ int s_idx, s_ip_idx;
+ struct net_device *dev;
+ struct inet6_dev *idev;
+ struct hlist_head *head;
+
+ s_h = cb->args[0];
+ s_idx = idx = cb->args[1];
+ s_ip_idx = ip_idx = cb->args[2];
+
+ rcu_read_lock();
+ cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
+ for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
+ idx = 0;
+ head = &net->dev_index_head[h];
+ hlist_for_each_entry_rcu(dev, head, index_hlist) {
+ if (idx < s_idx)
+ goto cont;
+ if (h > s_h || idx > s_idx)
+ s_ip_idx = 0;
+ ip_idx = 0;
+ idev = __in6_dev_get(dev);
+ if (!idev)
+ goto cont;
+
+ if (in6_dump_addrs(idev, skb, cb, type,
+ s_ip_idx, &ip_idx) < 0)
+ goto done;
+cont:
+ idx++;
+ }
+ }
+done:
+ rcu_read_unlock();
+ cb->args[0] = h;
+ cb->args[1] = idx;
+ cb->args[2] = ip_idx;
+
+ return skb->len;
+}
+
+static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ enum addr_type_t type = UNICAST_ADDR;
+
+ return inet6_dump_addr(skb, cb, type);
+}
+
+static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ enum addr_type_t type = MULTICAST_ADDR;
+
+ return inet6_dump_addr(skb, cb, type);
+}
+
+
+static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ enum addr_type_t type = ANYCAST_ADDR;
+
+ return inet6_dump_addr(skb, cb, type);
+}
+
+static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
+{
+ struct net *net = sock_net(in_skb->sk);
+ struct ifaddrmsg *ifm;
+ struct nlattr *tb[IFA_MAX+1];
+ struct in6_addr *addr = NULL, *peer;
+ struct net_device *dev = NULL;
+ struct inet6_ifaddr *ifa;
+ struct sk_buff *skb;
+ int err;
+
+ err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
+ if (err < 0)
+ goto errout;
+
+ addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
+ if (!addr) {
+ err = -EINVAL;
+ goto errout;
+ }
+
+ ifm = nlmsg_data(nlh);
+ if (ifm->ifa_index)
+ dev = __dev_get_by_index(net, ifm->ifa_index);
+
+ ifa = ipv6_get_ifaddr(net, addr, dev, 1);
+ if (!ifa) {
+ err = -EADDRNOTAVAIL;
+ goto errout;
+ }
+
+ skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
+ if (!skb) {
+ err = -ENOBUFS;
+ goto errout_ifa;
+ }
+
+ err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
+ nlh->nlmsg_seq, RTM_NEWADDR, 0);
+ if (err < 0) {
+ /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout_ifa;
+ }
+ err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
+errout_ifa:
+ in6_ifa_put(ifa);
+errout:
+ return err;
+}
+
+static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
+{
+ struct sk_buff *skb;
+ struct net *net = dev_net(ifa->idev->dev);
+ int err = -ENOBUFS;
+
+ skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
+ if (!skb)
+ goto errout;
+
+ err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
+ if (err < 0) {
+ /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout;
+ }
+ rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
+ return;
+errout:
+ if (err < 0)
+ rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
+}
+
+static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
+ __s32 *array, int bytes)
+{
+ BUG_ON(bytes < (DEVCONF_MAX * 4));
+
+ memset(array, 0, bytes);
+ array[DEVCONF_FORWARDING] = cnf->forwarding;
+ array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
+ array[DEVCONF_MTU6] = cnf->mtu6;
+ array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
+ array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
+ array[DEVCONF_AUTOCONF] = cnf->autoconf;
+ array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
+ array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
+ array[DEVCONF_RTR_SOLICIT_INTERVAL] =
+ jiffies_to_msecs(cnf->rtr_solicit_interval);
+ array[DEVCONF_RTR_SOLICIT_DELAY] =
+ jiffies_to_msecs(cnf->rtr_solicit_delay);
+ array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
+ array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
+ jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
+ array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
+ jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
+ array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
+ array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
+ array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
+ array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
+ array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
+ array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
+ array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
+ array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
+#ifdef CONFIG_IPV6_ROUTER_PREF
+ array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
+ array[DEVCONF_RTR_PROBE_INTERVAL] =
+ jiffies_to_msecs(cnf->rtr_probe_interval);
+#ifdef CONFIG_IPV6_ROUTE_INFO
+ array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
+#endif
+#endif
+ array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
+ array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+ array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
+ array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
+#endif
+#ifdef CONFIG_IPV6_MROUTE
+ array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
+#endif
+ array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
+ array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
+ array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
+ array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
+ array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
+ array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
+ array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
+ /* we omit DEVCONF_STABLE_SECRET for now */
+}
+
+static inline size_t inet6_ifla6_size(void)
+{
+ return nla_total_size(4) /* IFLA_INET6_FLAGS */
+ + nla_total_size(sizeof(struct ifla_cacheinfo))
+ + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
+ + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
+ + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
+ + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
+}
+
+static inline size_t inet6_if_nlmsg_size(void)
+{
+ return NLMSG_ALIGN(sizeof(struct ifinfomsg))
+ + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
+ + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
+ + nla_total_size(4) /* IFLA_MTU */
+ + nla_total_size(4) /* IFLA_LINK */
+ + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
+}
+
+static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
+ int items, int bytes)
+{
+ int i;
+ int pad = bytes - sizeof(u64) * items;
+ BUG_ON(pad < 0);
+
+ /* Use put_unaligned() because stats may not be aligned for u64. */
+ put_unaligned(items, &stats[0]);
+ for (i = 1; i < items; i++)
+ put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
+
+ memset(&stats[items], 0, pad);
+}
+
+static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
+ int items, int bytes, size_t syncpoff)
+{
+ int i;
+ int pad = bytes - sizeof(u64) * items;
+ BUG_ON(pad < 0);
+
+ /* Use put_unaligned() because stats may not be aligned for u64. */
+ put_unaligned(items, &stats[0]);
+ for (i = 1; i < items; i++)
+ put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
+
+ memset(&stats[items], 0, pad);
+}
+
+static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
+ int bytes)
+{
+ switch (attrtype) {
+ case IFLA_INET6_STATS:
+ __snmp6_fill_stats64(stats, idev->stats.ipv6,
+ IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
+ break;
+ case IFLA_INET6_ICMP6STATS:
+ __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
+ break;
+ }
+}
+
+static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
+{
+ struct nlattr *nla;
+ struct ifla_cacheinfo ci;
+
+ if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
+ goto nla_put_failure;
+ ci.max_reasm_len = IPV6_MAXPLEN;
+ ci.tstamp = cstamp_delta(idev->tstamp);
+ ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
+ ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
+ if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
+ goto nla_put_failure;
+ nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
+ if (!nla)
+ goto nla_put_failure;
+ ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
+
+ /* XXX - MC not implemented */
+
+ nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
+ if (!nla)
+ goto nla_put_failure;
+ snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
+
+ nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
+ if (!nla)
+ goto nla_put_failure;
+ snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
+
+ nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
+ if (!nla)
+ goto nla_put_failure;
+
+ if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
+ goto nla_put_failure;
+
+ read_lock_bh(&idev->lock);
+ memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
+ read_unlock_bh(&idev->lock);
+
+ return 0;
+
+nla_put_failure:
+ return -EMSGSIZE;
+}
+
+static size_t inet6_get_link_af_size(const struct net_device *dev)
+{
+ if (!__in6_dev_get(dev))
+ return 0;
+
+ return inet6_ifla6_size();
+}
+
+static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
+{
+ struct inet6_dev *idev = __in6_dev_get(dev);
+
+ if (!idev)
+ return -ENODATA;
+
+ if (inet6_fill_ifla6_attrs(skb, idev) < 0)
+ return -EMSGSIZE;
+
+ return 0;
+}
+
+static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
+{
+ struct inet6_ifaddr *ifp;
+ struct net_device *dev = idev->dev;
+ bool update_rs = false;
+ struct in6_addr ll_addr;
+
+ ASSERT_RTNL();
+
+ if (!token)
+ return -EINVAL;
+ if (ipv6_addr_any(token))
+ return -EINVAL;
+ if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
+ return -EINVAL;
+ if (!ipv6_accept_ra(idev))
+ return -EINVAL;
+ if (idev->cnf.rtr_solicits <= 0)
+ return -EINVAL;
+
+ write_lock_bh(&idev->lock);
+
+ BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
+ memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
+
+ write_unlock_bh(&idev->lock);
+
+ if (!idev->dead && (idev->if_flags & IF_READY) &&
+ !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
+ IFA_F_OPTIMISTIC)) {
+
+ /* If we're not ready, then normal ifup will take care
+ * of this. Otherwise, we need to request our rs here.
+ */
+ ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
+ update_rs = true;
+ }
+
+ write_lock_bh(&idev->lock);
+
+ if (update_rs) {
+ idev->if_flags |= IF_RS_SENT;
+ idev->rs_probes = 1;
+ addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
+ }
+
+ /* Well, that's kinda nasty ... */
+ list_for_each_entry(ifp, &idev->addr_list, if_list) {
+ spin_lock(&ifp->lock);
+ if (ifp->tokenized) {
+ ifp->valid_lft = 0;
+ ifp->prefered_lft = 0;
+ }
+ spin_unlock(&ifp->lock);
+ }
+
+ write_unlock_bh(&idev->lock);
+ inet6_ifinfo_notify(RTM_NEWLINK, idev);
+ addrconf_verify_rtnl();
+ return 0;
+}
+
+static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
+ [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
+ [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
+};
+
+static int inet6_validate_link_af(const struct net_device *dev,
+ const struct nlattr *nla)
+{
+ struct nlattr *tb[IFLA_INET6_MAX + 1];
+
+ if (dev && !__in6_dev_get(dev))
+ return -EAFNOSUPPORT;
+
+ return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
+}
+
+static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
+{
+ int err = -EINVAL;
+ struct inet6_dev *idev = __in6_dev_get(dev);
+ struct nlattr *tb[IFLA_INET6_MAX + 1];
+
+ if (!idev)
+ return -EAFNOSUPPORT;
+
+ if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
+ BUG();
+
+ if (tb[IFLA_INET6_TOKEN]) {
+ err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
+ if (err)
+ return err;
+ }
+
+ if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
+ u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
+
+ if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
+ mode != IN6_ADDR_GEN_MODE_NONE &&
+ mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
+ return -EINVAL;
+
+ if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
+ !idev->cnf.stable_secret.initialized &&
+ !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
+ return -EINVAL;
+
+ idev->addr_gen_mode = mode;
+ err = 0;
+ }
+
+ return err;
+}
+
+static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
+ u32 portid, u32 seq, int event, unsigned int flags)
+{
+ struct net_device *dev = idev->dev;
+ struct ifinfomsg *hdr;
+ struct nlmsghdr *nlh;
+ void *protoinfo;
+
+ nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ hdr = nlmsg_data(nlh);
+ hdr->ifi_family = AF_INET6;
+ hdr->__ifi_pad = 0;
+ hdr->ifi_type = dev->type;
+ hdr->ifi_index = dev->ifindex;
+ hdr->ifi_flags = dev_get_flags(dev);
+ hdr->ifi_change = 0;
+
+ if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
+ (dev->addr_len &&
+ nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
+ nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
+ (dev->ifindex != dev_get_iflink(dev) &&
+ nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
+ goto nla_put_failure;
+ protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
+ if (!protoinfo)
+ goto nla_put_failure;
+
+ if (inet6_fill_ifla6_attrs(skb, idev) < 0)
+ goto nla_put_failure;
+
+ nla_nest_end(skb, protoinfo);
+ nlmsg_end(skb, nlh);
+ return 0;
+
+nla_put_failure:
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+}
+
+static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct net *net = sock_net(skb->sk);
+ int h, s_h;
+ int idx = 0, s_idx;
+ struct net_device *dev;
+ struct inet6_dev *idev;
+ struct hlist_head *head;
+
+ s_h = cb->args[0];
+ s_idx = cb->args[1];
+
+ rcu_read_lock();
+ for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
+ idx = 0;
+ head = &net->dev_index_head[h];
+ hlist_for_each_entry_rcu(dev, head, index_hlist) {
+ if (idx < s_idx)
+ goto cont;
+ idev = __in6_dev_get(dev);
+ if (!idev)
+ goto cont;
+ if (inet6_fill_ifinfo(skb, idev,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ RTM_NEWLINK, NLM_F_MULTI) < 0)
+ goto out;
+cont:
+ idx++;
+ }
+ }
+out:
+ rcu_read_unlock();
+ cb->args[1] = idx;
+ cb->args[0] = h;
+
+ return skb->len;
+}
+
+void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
+{
+ struct sk_buff *skb;
+ struct net *net = dev_net(idev->dev);
+ int err = -ENOBUFS;
+
+ skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
+ if (!skb)
+ goto errout;
+
+ err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
+ if (err < 0) {
+ /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout;
+ }
+ rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
+ return;
+errout:
+ if (err < 0)
+ rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
+}
+
+static inline size_t inet6_prefix_nlmsg_size(void)
+{
+ return NLMSG_ALIGN(sizeof(struct prefixmsg))
+ + nla_total_size(sizeof(struct in6_addr))
+ + nla_total_size(sizeof(struct prefix_cacheinfo));
+}
+
+static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
+ struct prefix_info *pinfo, u32 portid, u32 seq,
+ int event, unsigned int flags)
+{
+ struct prefixmsg *pmsg;
+ struct nlmsghdr *nlh;
+ struct prefix_cacheinfo ci;
+
+ nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ pmsg = nlmsg_data(nlh);
+ pmsg->prefix_family = AF_INET6;
+ pmsg->prefix_pad1 = 0;
+ pmsg->prefix_pad2 = 0;
+ pmsg->prefix_ifindex = idev->dev->ifindex;
+ pmsg->prefix_len = pinfo->prefix_len;
+ pmsg->prefix_type = pinfo->type;
+ pmsg->prefix_pad3 = 0;
+ pmsg->prefix_flags = 0;
+ if (pinfo->onlink)
+ pmsg->prefix_flags |= IF_PREFIX_ONLINK;
+ if (pinfo->autoconf)
+ pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
+
+ if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
+ goto nla_put_failure;
+ ci.preferred_time = ntohl(pinfo->prefered);
+ ci.valid_time = ntohl(pinfo->valid);
+ if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
+ goto nla_put_failure;
+ nlmsg_end(skb, nlh);
+ return 0;
+
+nla_put_failure:
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+}
+
+static void inet6_prefix_notify(int event, struct inet6_dev *idev,
+ struct prefix_info *pinfo)
+{
+ struct sk_buff *skb;
+ struct net *net = dev_net(idev->dev);
+ int err = -ENOBUFS;
+
+ skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
+ if (!skb)
+ goto errout;
+
+ err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
+ if (err < 0) {
+ /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout;
+ }
+ rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
+ return;
+errout:
+ if (err < 0)
+ rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
+}
+
+static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
+{
+ struct net *net = dev_net(ifp->idev->dev);
+
+ if (event)
+ ASSERT_RTNL();
+
+ inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
+
+ switch (event) {
+ case RTM_NEWADDR:
+ /*
+ * If the address was optimistic
+ * we inserted the route at the start of
+ * our DAD process, so we don't need
+ * to do it again
+ */
+ if (!(ifp->rt->rt6i_node))
+ ip6_ins_rt(ifp->rt);
+ if (ifp->idev->cnf.forwarding)
+ addrconf_join_anycast(ifp);
+ if (!ipv6_addr_any(&ifp->peer_addr))
+ addrconf_prefix_route(&ifp->peer_addr, 128,
+ ifp->idev->dev, 0, 0);
+ break;
+ case RTM_DELADDR:
+ if (ifp->idev->cnf.forwarding)
+ addrconf_leave_anycast(ifp);
+ addrconf_leave_solict(ifp->idev, &ifp->addr);
+ if (!ipv6_addr_any(&ifp->peer_addr)) {
+ struct rt6_info *rt;
+
+ rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
+ ifp->idev->dev, 0, 0);
+ if (rt && ip6_del_rt(rt))
+ dst_free(&rt->dst);
+ }
+ dst_hold(&ifp->rt->dst);
+
+ if (ip6_del_rt(ifp->rt))
+ dst_free(&ifp->rt->dst);
+
+ rt_genid_bump_ipv6(net);
+ break;
+ }
+ atomic_inc(&net->ipv6.dev_addr_genid);
+}
+
+static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
+{
+ rcu_read_lock_bh();
+ if (likely(ifp->idev->dead == 0))
+ __ipv6_ifa_notify(event, ifp);
+ rcu_read_unlock_bh();
+}
+
+#ifdef CONFIG_SYSCTL
+
+static
+int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ int *valp = ctl->data;
+ int val = *valp;
+ loff_t pos = *ppos;
+ struct ctl_table lctl;
+ int ret;
+
+ /*
+ * ctl->data points to idev->cnf.forwarding, we should
+ * not modify it until we get the rtnl lock.
+ */
+ lctl = *ctl;
+ lctl.data = &val;
+
+ ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
+
+ if (write)
+ ret = addrconf_fixup_forwarding(ctl, valp, val);
+ if (ret)
+ *ppos = pos;
+ return ret;
+}
+
+static
+int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct inet6_dev *idev = ctl->extra1;
+ int min_mtu = IPV6_MIN_MTU;
+ struct ctl_table lctl;
+
+ lctl = *ctl;
+ lctl.extra1 = &min_mtu;
+ lctl.extra2 = idev ? &idev->dev->mtu : NULL;
+
+ return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
+}
+
+static void dev_disable_change(struct inet6_dev *idev)
+{
+ struct netdev_notifier_info info;
+
+ if (!idev || !idev->dev)
+ return;
+
+ netdev_notifier_info_init(&info, idev->dev);
+ if (idev->cnf.disable_ipv6)
+ addrconf_notify(NULL, NETDEV_DOWN, &info);
+ else
+ addrconf_notify(NULL, NETDEV_UP, &info);
+}
+
+static void addrconf_disable_change(struct net *net, __s32 newf)
+{
+ struct net_device *dev;
+ struct inet6_dev *idev;
+
+ rcu_read_lock();
+ for_each_netdev_rcu(net, dev) {
+ idev = __in6_dev_get(dev);
+ if (idev) {
+ int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
+ idev->cnf.disable_ipv6 = newf;
+ if (changed)
+ dev_disable_change(idev);
+ }
+ }
+ rcu_read_unlock();
+}
+
+static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
+{
+ struct net *net;
+ int old;
+
+ if (!rtnl_trylock())
+ return restart_syscall();
+
+ net = (struct net *)table->extra2;
+ old = *p;
+ *p = newf;
+
+ if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
+ rtnl_unlock();
+ return 0;
+ }
+
+ if (p == &net->ipv6.devconf_all->disable_ipv6) {
+ net->ipv6.devconf_dflt->disable_ipv6 = newf;
+ addrconf_disable_change(net, newf);
+ } else if ((!newf) ^ (!old))
+ dev_disable_change((struct inet6_dev *)table->extra1);
+
+ rtnl_unlock();
+ return 0;
+}
+
+static
+int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ int *valp = ctl->data;
+ int val = *valp;
+ loff_t pos = *ppos;
+ struct ctl_table lctl;
+ int ret;
+
+ /*
+ * ctl->data points to idev->cnf.disable_ipv6, we should
+ * not modify it until we get the rtnl lock.
+ */
+ lctl = *ctl;
+ lctl.data = &val;
+
+ ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
+
+ if (write)
+ ret = addrconf_disable_ipv6(ctl, valp, val);
+ if (ret)
+ *ppos = pos;
+ return ret;
+}
+
+static
+int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ int *valp = ctl->data;
+ int ret;
+ int old, new;
+
+ old = *valp;
+ ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
+ new = *valp;
+
+ if (write && old != new) {
+ struct net *net = ctl->extra2;
+
+ if (!rtnl_trylock())
+ return restart_syscall();
+
+ if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
+ inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
+ NETCONFA_IFINDEX_DEFAULT,
+ net->ipv6.devconf_dflt);
+ else if (valp == &net->ipv6.devconf_all->proxy_ndp)
+ inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
+ NETCONFA_IFINDEX_ALL,
+ net->ipv6.devconf_all);
+ else {
+ struct inet6_dev *idev = ctl->extra1;
+
+ inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
+ idev->dev->ifindex,
+ &idev->cnf);
+ }
+ rtnl_unlock();
+ }
+
+ return ret;
+}
+
+static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
+ void __user *buffer, size_t *lenp,
+ loff_t *ppos)
+{
+ int err;
+ struct in6_addr addr;
+ char str[IPV6_MAX_STRLEN];
+ struct ctl_table lctl = *ctl;
+ struct net *net = ctl->extra2;
+ struct ipv6_stable_secret *secret = ctl->data;
+
+ if (&net->ipv6.devconf_all->stable_secret == ctl->data)
+ return -EIO;
+
+ lctl.maxlen = IPV6_MAX_STRLEN;
+ lctl.data = str;
+
+ if (!rtnl_trylock())
+ return restart_syscall();
+
+ if (!write && !secret->initialized) {
+ err = -EIO;
+ goto out;
+ }
+
+ if (!write) {
+ err = snprintf(str, sizeof(str), "%pI6",
+ &secret->secret);
+ if (err >= sizeof(str)) {
+ err = -EIO;
+ goto out;
+ }
+ }
+
+ err = proc_dostring(&lctl, write, buffer, lenp, ppos);
+ if (err || !write)
+ goto out;
+
+ if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
+ err = -EIO;
+ goto out;
+ }
+
+ secret->initialized = true;
+ secret->secret = addr;
+
+ if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
+ struct net_device *dev;
+
+ for_each_netdev(net, dev) {
+ struct inet6_dev *idev = __in6_dev_get(dev);
+
+ if (idev) {
+ idev->addr_gen_mode =
+ IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
+ }
+ }
+ } else {
+ struct inet6_dev *idev = ctl->extra1;
+
+ idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
+ }
+
+out:
+ rtnl_unlock();
+
+ return err;
+}
+
+static struct addrconf_sysctl_table
+{
+ struct ctl_table_header *sysctl_header;
+ struct ctl_table addrconf_vars[DEVCONF_MAX+1];
+} addrconf_sysctl __read_mostly = {
+ .sysctl_header = NULL,
+ .addrconf_vars = {
+ {
+ .procname = "forwarding",
+ .data = &ipv6_devconf.forwarding,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = addrconf_sysctl_forward,
+ },
+ {
+ .procname = "hop_limit",
+ .data = &ipv6_devconf.hop_limit,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "mtu",
+ .data = &ipv6_devconf.mtu6,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = addrconf_sysctl_mtu,
+ },
+ {
+ .procname = "accept_ra",
+ .data = &ipv6_devconf.accept_ra,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "accept_redirects",
+ .data = &ipv6_devconf.accept_redirects,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "autoconf",
+ .data = &ipv6_devconf.autoconf,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "dad_transmits",
+ .data = &ipv6_devconf.dad_transmits,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "router_solicitations",
+ .data = &ipv6_devconf.rtr_solicits,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "router_solicitation_interval",
+ .data = &ipv6_devconf.rtr_solicit_interval,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "router_solicitation_delay",
+ .data = &ipv6_devconf.rtr_solicit_delay,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "force_mld_version",
+ .data = &ipv6_devconf.force_mld_version,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "mldv1_unsolicited_report_interval",
+ .data =
+ &ipv6_devconf.mldv1_unsolicited_report_interval,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_ms_jiffies,
+ },
+ {
+ .procname = "mldv2_unsolicited_report_interval",
+ .data =
+ &ipv6_devconf.mldv2_unsolicited_report_interval,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_ms_jiffies,
+ },
+ {
+ .procname = "use_tempaddr",
+ .data = &ipv6_devconf.use_tempaddr,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "temp_valid_lft",
+ .data = &ipv6_devconf.temp_valid_lft,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "temp_prefered_lft",
+ .data = &ipv6_devconf.temp_prefered_lft,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "regen_max_retry",
+ .data = &ipv6_devconf.regen_max_retry,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "max_desync_factor",
+ .data = &ipv6_devconf.max_desync_factor,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "max_addresses",
+ .data = &ipv6_devconf.max_addresses,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "accept_ra_defrtr",
+ .data = &ipv6_devconf.accept_ra_defrtr,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "accept_ra_pinfo",
+ .data = &ipv6_devconf.accept_ra_pinfo,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#ifdef CONFIG_IPV6_ROUTER_PREF
+ {
+ .procname = "accept_ra_rtr_pref",
+ .data = &ipv6_devconf.accept_ra_rtr_pref,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "router_probe_interval",
+ .data = &ipv6_devconf.rtr_probe_interval,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+#ifdef CONFIG_IPV6_ROUTE_INFO
+ {
+ .procname = "accept_ra_rt_info_max_plen",
+ .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#endif
+#endif
+ {
+ .procname = "proxy_ndp",
+ .data = &ipv6_devconf.proxy_ndp,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = addrconf_sysctl_proxy_ndp,
+ },
+ {
+ .procname = "accept_source_route",
+ .data = &ipv6_devconf.accept_source_route,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+ {
+ .procname = "optimistic_dad",
+ .data = &ipv6_devconf.optimistic_dad,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+
+ },
+ {
+ .procname = "use_optimistic",
+ .data = &ipv6_devconf.use_optimistic,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+
+ },
+#endif
+#ifdef CONFIG_IPV6_MROUTE
+ {
+ .procname = "mc_forwarding",
+ .data = &ipv6_devconf.mc_forwarding,
+ .maxlen = sizeof(int),
+ .mode = 0444,
+ .proc_handler = proc_dointvec,
+ },
+#endif
+ {
+ .procname = "disable_ipv6",
+ .data = &ipv6_devconf.disable_ipv6,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = addrconf_sysctl_disable,
+ },
+ {
+ .procname = "accept_dad",
+ .data = &ipv6_devconf.accept_dad,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "force_tllao",
+ .data = &ipv6_devconf.force_tllao,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "ndisc_notify",
+ .data = &ipv6_devconf.ndisc_notify,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "suppress_frag_ndisc",
+ .data = &ipv6_devconf.suppress_frag_ndisc,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "accept_ra_from_local",
+ .data = &ipv6_devconf.accept_ra_from_local,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "accept_ra_mtu",
+ .data = &ipv6_devconf.accept_ra_mtu,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "stable_secret",
+ .data = &ipv6_devconf.stable_secret,
+ .maxlen = IPV6_MAX_STRLEN,
+ .mode = 0600,
+ .proc_handler = addrconf_sysctl_stable_secret,
+ },
+ {
+ /* sentinel */
+ }
+ },
+};
+
+static int __addrconf_sysctl_register(struct net *net, char *dev_name,
+ struct inet6_dev *idev, struct ipv6_devconf *p)
+{
+ int i;
+ struct addrconf_sysctl_table *t;
+ char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
+
+ t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
+ if (!t)
+ goto out;
+
+ for (i = 0; t->addrconf_vars[i].data; i++) {
+ t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
+ t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
+ t->addrconf_vars[i].extra2 = net;
+ }
+
+ snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
+
+ t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
+ if (!t->sysctl_header)
+ goto free;
+
+ p->sysctl = t;
+ return 0;
+
+free:
+ kfree(t);
+out:
+ return -ENOBUFS;
+}
+
+static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
+{
+ struct addrconf_sysctl_table *t;
+
+ if (!p->sysctl)
+ return;
+
+ t = p->sysctl;
+ p->sysctl = NULL;
+ unregister_net_sysctl_table(t->sysctl_header);
+ kfree(t);
+}
+
+static int addrconf_sysctl_register(struct inet6_dev *idev)
+{
+ int err;
+
+ if (!sysctl_dev_name_is_allowed(idev->dev->name))
+ return -EINVAL;
+
+ err = neigh_sysctl_register(idev->dev, idev->nd_parms,
+ &ndisc_ifinfo_sysctl_change);
+ if (err)
+ return err;
+ err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
+ idev, &idev->cnf);
+ if (err)
+ neigh_sysctl_unregister(idev->nd_parms);
+
+ return err;
+}
+
+static void addrconf_sysctl_unregister(struct inet6_dev *idev)
+{
+ __addrconf_sysctl_unregister(&idev->cnf);
+ neigh_sysctl_unregister(idev->nd_parms);
+}
+
+
+#endif
+
+static int __net_init addrconf_init_net(struct net *net)
+{
+ int err = -ENOMEM;
+ struct ipv6_devconf *all, *dflt;
+
+ all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
+ if (!all)
+ goto err_alloc_all;
+
+ dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
+ if (!dflt)
+ goto err_alloc_dflt;
+
+ /* these will be inherited by all namespaces */
+ dflt->autoconf = ipv6_defaults.autoconf;
+ dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
+
+ dflt->stable_secret.initialized = false;
+ all->stable_secret.initialized = false;
+
+ net->ipv6.devconf_all = all;
+ net->ipv6.devconf_dflt = dflt;
+
+#ifdef CONFIG_SYSCTL
+ err = __addrconf_sysctl_register(net, "all", NULL, all);
+ if (err < 0)
+ goto err_reg_all;
+
+ err = __addrconf_sysctl_register(net, "default", NULL, dflt);
+ if (err < 0)
+ goto err_reg_dflt;
+#endif
+ return 0;
+
+#ifdef CONFIG_SYSCTL
+err_reg_dflt:
+ __addrconf_sysctl_unregister(all);
+err_reg_all:
+ kfree(dflt);
+#endif
+err_alloc_dflt:
+ kfree(all);
+err_alloc_all:
+ return err;
+}
+
+static void __net_exit addrconf_exit_net(struct net *net)
+{
+#ifdef CONFIG_SYSCTL
+ __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
+ __addrconf_sysctl_unregister(net->ipv6.devconf_all);
+#endif
+ kfree(net->ipv6.devconf_dflt);
+ kfree(net->ipv6.devconf_all);
+}
+
+static struct pernet_operations addrconf_ops = {
+ .init = addrconf_init_net,
+ .exit = addrconf_exit_net,
+};
+
+static struct rtnl_af_ops inet6_ops __read_mostly = {
+ .family = AF_INET6,
+ .fill_link_af = inet6_fill_link_af,
+ .get_link_af_size = inet6_get_link_af_size,
+ .validate_link_af = inet6_validate_link_af,
+ .set_link_af = inet6_set_link_af,
+};
+
+/*
+ * Init / cleanup code
+ */
+
+int __init addrconf_init(void)
+{
+ struct inet6_dev *idev;
+ int i, err;
+
+ err = ipv6_addr_label_init();
+ if (err < 0) {
+ pr_crit("%s: cannot initialize default policy table: %d\n",
+ __func__, err);
+ goto out;
+ }
+
+ err = register_pernet_subsys(&addrconf_ops);
+ if (err < 0)
+ goto out_addrlabel;
+
+ addrconf_wq = create_workqueue("ipv6_addrconf");
+ if (!addrconf_wq) {
+ err = -ENOMEM;
+ goto out_nowq;
+ }
+
+ /* The addrconf netdev notifier requires that loopback_dev
+ * has it's ipv6 private information allocated and setup
+ * before it can bring up and give link-local addresses
+ * to other devices which are up.
+ *
+ * Unfortunately, loopback_dev is not necessarily the first
+ * entry in the global dev_base list of net devices. In fact,
+ * it is likely to be the very last entry on that list.
+ * So this causes the notifier registry below to try and
+ * give link-local addresses to all devices besides loopback_dev
+ * first, then loopback_dev, which cases all the non-loopback_dev
+ * devices to fail to get a link-local address.
+ *
+ * So, as a temporary fix, allocate the ipv6 structure for
+ * loopback_dev first by hand.
+ * Longer term, all of the dependencies ipv6 has upon the loopback
+ * device and it being up should be removed.
+ */
+ rtnl_lock();
+ idev = ipv6_add_dev(init_net.loopback_dev);
+ rtnl_unlock();
+ if (IS_ERR(idev)) {
+ err = PTR_ERR(idev);
+ goto errlo;
+ }
+
+ for (i = 0; i < IN6_ADDR_HSIZE; i++)
+ INIT_HLIST_HEAD(&inet6_addr_lst[i]);
+
+ register_netdevice_notifier(&ipv6_dev_notf);
+
+ addrconf_verify();
+
+ rtnl_af_register(&inet6_ops);
+
+ err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
+ NULL);
+ if (err < 0)
+ goto errout;
+
+ /* Only the first call to __rtnl_register can fail */
+ __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
+ __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
+ __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
+ inet6_dump_ifaddr, NULL);
+ __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
+ inet6_dump_ifmcaddr, NULL);
+ __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
+ inet6_dump_ifacaddr, NULL);
+ __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
+ inet6_netconf_dump_devconf, NULL);
+
+ ipv6_addr_label_rtnl_register();
+
+ return 0;
+errout:
+ rtnl_af_unregister(&inet6_ops);
+ unregister_netdevice_notifier(&ipv6_dev_notf);
+errlo:
+ destroy_workqueue(addrconf_wq);
+out_nowq:
+ unregister_pernet_subsys(&addrconf_ops);
+out_addrlabel:
+ ipv6_addr_label_cleanup();
+out:
+ return err;
+}
+
+void addrconf_cleanup(void)
+{
+ struct net_device *dev;
+ int i;
+
+ unregister_netdevice_notifier(&ipv6_dev_notf);
+ unregister_pernet_subsys(&addrconf_ops);
+ ipv6_addr_label_cleanup();
+
+ rtnl_lock();
+
+ __rtnl_af_unregister(&inet6_ops);
+
+ /* clean dev list */
+ for_each_netdev(&init_net, dev) {
+ if (__in6_dev_get(dev) == NULL)
+ continue;
+ addrconf_ifdown(dev, 1);
+ }
+ addrconf_ifdown(init_net.loopback_dev, 2);
+
+ /*
+ * Check hash table.
+ */
+ spin_lock_bh(&addrconf_hash_lock);
+ for (i = 0; i < IN6_ADDR_HSIZE; i++)
+ WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
+ spin_unlock_bh(&addrconf_hash_lock);
+ cancel_delayed_work(&addr_chk_work);
+ rtnl_unlock();
+
+ destroy_workqueue(addrconf_wq);
+}
Code Review / kvmfornfv.git / blobdiff