diff options
Diffstat (limited to 'net/ipv6/addrconf.c')
| -rw-r--r-- | net/ipv6/addrconf.c | 7402 |
1 files changed, 7402 insertions, 0 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c new file mode 100644 index 000000000..b8dc20fe7 --- /dev/null +++ b/net/ipv6/addrconf.c @@ -0,0 +1,7402 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * IPv6 Address [auto]configuration + * Linux INET6 implementation + * + * Authors: + * Pedro Roque <roque@di.fc.ul.pt> + * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> + */ + +/* + * 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/sched/signal.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/6lowpan.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 <net/l3mdev.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> +#include <linux/ioam6.h> + +#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; +} + +static inline s32 rfc3315_s14_backoff_init(s32 irt) +{ + /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ + u64 tmp = (900000 + prandom_u32_max(200001)) * (u64)irt; + do_div(tmp, 1000000); + return (s32)tmp; +} + +static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) +{ + /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ + u64 tmp = (1900000 + prandom_u32_max(200001)) * (u64)rt; + do_div(tmp, 1000000); + if ((s32)tmp > mrt) { + /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ + tmp = (900000 + prandom_u32_max(200001)) * (u64)mrt; + do_div(tmp, 1000000); + } + return (s32)tmp; +} + +#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_gen_rnd_iid(struct in6_addr *addr); + +static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); +static int ipv6_count_addresses(const struct inet6_dev *idev); +static int ipv6_generate_stable_address(struct in6_addr *addr, + u8 dad_count, + const struct inet6_dev *idev); + +#define IN6_ADDR_HSIZE_SHIFT 8 +#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) + +static void addrconf_verify(struct net *net); +static void addrconf_verify_rtnl(struct net *net); + +static struct workqueue_struct *addrconf_wq; + +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, bool unregister); + +static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, + int plen, + const struct net_device *dev, + u32 flags, u32 noflags, + bool no_gw); + +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, bool bump_id, + bool send_na); +static void addrconf_dad_run(struct inet6_dev *idev, bool restart); +static void addrconf_rs_timer(struct timer_list *t); +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 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_max_interval = RTR_SOLICITATION_MAX_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, + .ra_defrtr_metric = IP6_RT_PRIO_USER, + .accept_ra_from_local = 0, + .accept_ra_min_hop_limit= 1, + .accept_ra_min_lft = 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_min_plen = 0, + .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 = 0, + .suppress_frag_ndisc = 1, + .accept_ra_mtu = 1, + .stable_secret = { + .initialized = false, + }, + .use_oif_addrs_only = 0, + .ignore_routes_with_linkdown = 0, + .keep_addr_on_down = 0, + .seg6_enabled = 0, +#ifdef CONFIG_IPV6_SEG6_HMAC + .seg6_require_hmac = 0, +#endif + .enhanced_dad = 1, + .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, + .disable_policy = 0, + .rpl_seg_enabled = 0, + .ioam6_enabled = 0, + .ioam6_id = IOAM6_DEFAULT_IF_ID, + .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, + .ndisc_evict_nocarrier = 1, +}; + +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_max_interval = RTR_SOLICITATION_MAX_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, + .ra_defrtr_metric = IP6_RT_PRIO_USER, + .accept_ra_from_local = 0, + .accept_ra_min_hop_limit= 1, + .accept_ra_min_lft = 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_min_plen = 0, + .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, + }, + .use_oif_addrs_only = 0, + .ignore_routes_with_linkdown = 0, + .keep_addr_on_down = 0, + .seg6_enabled = 0, +#ifdef CONFIG_IPV6_SEG6_HMAC + .seg6_require_hmac = 0, +#endif + .enhanced_dad = 1, + .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, + .disable_policy = 0, + .rpl_seg_enabled = 0, + .ioam6_enabled = 0, + .ioam6_id = IOAM6_DEFAULT_IF_ID, + .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, + .ndisc_evict_nocarrier = 1, +}; + +/* Check if link is ready: is it up and is a valid qdisc available */ +static inline bool addrconf_link_ready(const struct net_device *dev) +{ + return netif_oper_up(dev) && !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 (!mod_timer(&idev->rs_timer, jiffies + when)) + in6_dev_hold(idev); +} + +static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, + unsigned long delay) +{ + in6_ifa_hold(ifp); + if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) + in6_ifa_put(ifp); +} + +static int snmp6_alloc_dev(struct inet6_dev *idev) +{ + int i; + + idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT); + 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_ACCOUNT); + 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 && dev != blackhole_netdev) + return ERR_PTR(-EINVAL); + + ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT); + if (!ndev) + return ERR_PTR(err); + + rwlock_init(&ndev->lock); + ndev->dev = dev; + INIT_LIST_HEAD(&ndev->addr_list); + timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); + memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); + + if (ndev->cnf.stable_secret.initialized) + ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; + + ndev->cnf.mtu6 = dev->mtu; + ndev->ra_mtu = 0; + 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 */ + netdev_hold(dev, &ndev->dev_tracker, GFP_KERNEL); + + if (snmp6_alloc_dev(ndev) < 0) { + netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", + __func__); + neigh_parms_release(&nd_tbl, ndev->nd_parms); + netdev_put(dev, &ndev->dev_tracker); + kfree(ndev); + return ERR_PTR(err); + } + + if (dev != blackhole_netdev) { + if (snmp6_register_dev(ndev) < 0) { + netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", + __func__, dev->name); + goto err_release; + } + } + /* One reference from device. */ + refcount_set(&ndev->refcnt, 1); + + 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); + ndev->desync_factor = U32_MAX; + 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; + } + + ndev->token = in6addr_any; + + if (netif_running(dev) && addrconf_link_ready(dev)) + ndev->if_flags |= IF_READY; + + ipv6_mc_init_dev(ndev); + ndev->tstamp = jiffies; + if (dev != blackhole_netdev) { + err = addrconf_sysctl_register(ndev); + if (err) { + ipv6_mc_destroy_dev(ndev); + snmp6_unregister_dev(ndev); + goto err_release; + } + } + /* protected by rtnl_lock */ + rcu_assign_pointer(dev->ip6_ptr, ndev); + + if (dev != blackhole_netdev) { + /* 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 idev; + } + + 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 */ + bool all = false; + + if (type == NETCONFA_ALL) + all = true; + + if (all || type == NETCONFA_FORWARDING) + size += nla_total_size(4); +#ifdef CONFIG_IPV6_MROUTE + if (all || type == NETCONFA_MC_FORWARDING) + size += nla_total_size(4); +#endif + if (all || type == NETCONFA_PROXY_NEIGH) + size += nla_total_size(4); + + if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) + 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; + bool all = false; + + nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), + flags); + if (!nlh) + return -EMSGSIZE; + + if (type == NETCONFA_ALL) + all = true; + + ncm = nlmsg_data(nlh); + ncm->ncm_family = AF_INET6; + + if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) + goto nla_put_failure; + + if (!devconf) + goto out; + + if ((all || type == NETCONFA_FORWARDING) && + nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) + goto nla_put_failure; +#ifdef CONFIG_IPV6_MROUTE + if ((all || type == NETCONFA_MC_FORWARDING) && + nla_put_s32(skb, NETCONFA_MC_FORWARDING, + atomic_read(&devconf->mc_forwarding)) < 0) + goto nla_put_failure; +#endif + if ((all || type == NETCONFA_PROXY_NEIGH) && + nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) + goto nla_put_failure; + + if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && + nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, + devconf->ignore_routes_with_linkdown) < 0) + goto nla_put_failure; + +out: + nlmsg_end(skb, nlh); + return 0; + +nla_put_failure: + nlmsg_cancel(skb, nlh); + return -EMSGSIZE; +} + +void inet6_netconf_notify_devconf(struct net *net, int event, int type, + int ifindex, struct ipv6_devconf *devconf) +{ + struct sk_buff *skb; + int err = -ENOBUFS; + + skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); + if (!skb) + goto errout; + + err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, + event, 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_KERNEL); + 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) }, + [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, +}; + +static int inet6_netconf_valid_get_req(struct sk_buff *skb, + const struct nlmsghdr *nlh, + struct nlattr **tb, + struct netlink_ext_ack *extack) +{ + int i, err; + + if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { + NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); + return -EINVAL; + } + + if (!netlink_strict_get_check(skb)) + return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), + tb, NETCONFA_MAX, + devconf_ipv6_policy, extack); + + err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), + tb, NETCONFA_MAX, + devconf_ipv6_policy, extack); + if (err) + return err; + + for (i = 0; i <= NETCONFA_MAX; i++) { + if (!tb[i]) + continue; + + switch (i) { + case NETCONFA_IFINDEX: + break; + default: + NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); + return -EINVAL; + } + } + + return 0; +} + +static int inet6_netconf_get_devconf(struct sk_buff *in_skb, + struct nlmsghdr *nlh, + struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(in_skb->sk); + struct nlattr *tb[NETCONFA_MAX+1]; + struct inet6_dev *in6_dev = NULL; + struct net_device *dev = NULL; + struct sk_buff *skb; + struct ipv6_devconf *devconf; + int ifindex; + int err; + + err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); + if (err < 0) + return err; + + if (!tb[NETCONFA_IFINDEX]) + return -EINVAL; + + err = -EINVAL; + 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) + return -EINVAL; + 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(NETCONFA_ALL), GFP_KERNEL); + if (!skb) + goto errout; + + err = inet6_netconf_fill_devconf(skb, ifindex, devconf, + NETLINK_CB(in_skb).portid, + nlh->nlmsg_seq, RTM_NEWNETCONF, 0, + NETCONFA_ALL); + 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: + if (in6_dev) + in6_dev_put(in6_dev); + dev_put(dev); + return err; +} + +static int inet6_netconf_dump_devconf(struct sk_buff *skb, + struct netlink_callback *cb) +{ + const struct nlmsghdr *nlh = cb->nlh; + 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; + + if (cb->strict_check) { + struct netlink_ext_ack *extack = cb->extack; + struct netconfmsg *ncm; + + if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { + NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); + return -EINVAL; + } + + if (nlmsg_attrlen(nlh, sizeof(*ncm))) { + NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); + return -EINVAL; + } + } + + 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, + nlh->nlmsg_seq, + RTM_NEWNETCONF, + NLM_F_MULTI, + NETCONFA_ALL) < 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, + nlh->nlmsg_seq, + RTM_NEWNETCONF, NLM_F_MULTI, + NETCONFA_ALL) < 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, + nlh->nlmsg_seq, + RTM_NEWNETCONF, NLM_F_MULTI, + NETCONFA_ALL) < 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; + LIST_HEAD(tmp_addr_list); + + 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); + } + } + + read_lock_bh(&idev->lock); + list_for_each_entry(ifa, &idev->addr_list, if_list) { + if (ifa->flags&IFA_F_TENTATIVE) + continue; + list_add_tail(&ifa->if_list_aux, &tmp_addr_list); + } + read_unlock_bh(&idev->lock); + + while (!list_empty(&tmp_addr_list)) { + ifa = list_first_entry(&tmp_addr_list, + struct inet6_ifaddr, if_list_aux); + list_del(&ifa->if_list_aux); + if (idev->cnf.forwarding) + addrconf_join_anycast(ifa); + else + addrconf_leave_anycast(ifa); + } + + inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, + 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, RTM_NEWNETCONF, + NETCONFA_FORWARDING, + NETCONFA_IFINDEX_DEFAULT, + net->ipv6.devconf_dflt); + rtnl_unlock(); + return 0; + } + + if (p == &net->ipv6.devconf_all->forwarding) { + int old_dflt = net->ipv6.devconf_dflt->forwarding; + + net->ipv6.devconf_dflt->forwarding = newf; + if ((!newf) ^ (!old_dflt)) + inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, + NETCONFA_FORWARDING, + NETCONFA_IFINDEX_DEFAULT, + net->ipv6.devconf_dflt); + + addrconf_forward_change(net, newf); + if ((!newf) ^ (!old)) + inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, + 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; +} + +static void addrconf_linkdown_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.ignore_routes_with_linkdown) ^ (!newf); + + idev->cnf.ignore_routes_with_linkdown = newf; + if (changed) + inet6_netconf_notify_devconf(dev_net(dev), + RTM_NEWNETCONF, + NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, + dev->ifindex, + &idev->cnf); + } + } +} + +static int addrconf_fixup_linkdown(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->ignore_routes_with_linkdown) { + if ((!newf) ^ (!old)) + inet6_netconf_notify_devconf(net, + RTM_NEWNETCONF, + NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, + NETCONFA_IFINDEX_DEFAULT, + net->ipv6.devconf_dflt); + rtnl_unlock(); + return 0; + } + + if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { + net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; + addrconf_linkdown_change(net, newf); + if ((!newf) ^ (!old)) + inet6_netconf_notify_devconf(net, + RTM_NEWNETCONF, + NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, + NETCONFA_IFINDEX_ALL, + net->ipv6.devconf_all); + } + rtnl_unlock(); + + 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; + } + + 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_rcu(&ifp->if_list, p); +} + +static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) +{ + u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); + + return hash_32(val, IN6_ADDR_HSIZE_SHIFT); +} + +static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, + struct net_device *dev, unsigned int hash) +{ + struct inet6_ifaddr *ifp; + + hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { + if (ipv6_addr_equal(&ifp->addr, addr)) { + if (!dev || ifp->idev->dev == dev) + return true; + } + } + return false; +} + +static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) +{ + struct net *net = dev_net(dev); + unsigned int hash = inet6_addr_hash(net, &ifa->addr); + int err = 0; + + spin_lock_bh(&net->ipv6.addrconf_hash_lock); + + /* Ignore adding duplicate addresses on an interface */ + if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) { + netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); + err = -EEXIST; + } else { + hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]); + } + + spin_unlock_bh(&net->ipv6.addrconf_hash_lock); + + return err; +} + +/* On success it returns ifp with increased reference count */ + +static struct inet6_ifaddr * +ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, + bool can_block, struct netlink_ext_ack *extack) +{ + gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; + int addr_type = ipv6_addr_type(cfg->pfx); + struct net *net = dev_net(idev->dev); + struct inet6_ifaddr *ifa = NULL; + struct fib6_info *f6i = NULL; + int err = 0; + + if (addr_type == IPV6_ADDR_ANY || + (addr_type & IPV6_ADDR_MULTICAST && + !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) || + (!(idev->dev->flags & IFF_LOOPBACK) && + !netif_is_l3_master(idev->dev) && + addr_type & IPV6_ADDR_LOOPBACK)) + return ERR_PTR(-EADDRNOTAVAIL); + + if (idev->dead) { + err = -ENODEV; /*XXX*/ + goto out; + } + + if (idev->cnf.disable_ipv6) { + err = -EACCES; + goto out; + } + + /* validator notifier needs to be blocking; + * do not call in atomic context + */ + if (can_block) { + struct in6_validator_info i6vi = { + .i6vi_addr = *cfg->pfx, + .i6vi_dev = idev, + .extack = extack, + }; + + err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); + err = notifier_to_errno(err); + if (err < 0) + goto out; + } + + ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT); + if (!ifa) { + err = -ENOBUFS; + goto out; + } + + f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); + if (IS_ERR(f6i)) { + err = PTR_ERR(f6i); + f6i = NULL; + goto out; + } + + neigh_parms_data_state_setall(idev->nd_parms); + + ifa->addr = *cfg->pfx; + if (cfg->peer_pfx) + ifa->peer_addr = *cfg->peer_pfx; + + spin_lock_init(&ifa->lock); + INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); + INIT_HLIST_NODE(&ifa->addr_lst); + ifa->scope = cfg->scope; + ifa->prefix_len = cfg->plen; + ifa->rt_priority = cfg->rt_priority; + ifa->flags = cfg->ifa_flags; + ifa->ifa_proto = cfg->ifa_proto; + /* No need to add the TENTATIVE flag for addresses with NODAD */ + if (!(cfg->ifa_flags & IFA_F_NODAD)) + ifa->flags |= IFA_F_TENTATIVE; + ifa->valid_lft = cfg->valid_lft; + ifa->prefered_lft = cfg->preferred_lft; + ifa->cstamp = ifa->tstamp = jiffies; + ifa->tokenized = false; + + ifa->rt = f6i; + + ifa->idev = idev; + in6_dev_hold(idev); + + /* For caller */ + refcount_set(&ifa->refcnt, 1); + + rcu_read_lock(); + + err = ipv6_add_addr_hash(idev->dev, ifa); + if (err < 0) { + rcu_read_unlock(); + goto out; + } + + write_lock_bh(&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_bh(&idev->lock); + + rcu_read_unlock(); + + inet6addr_notifier_call_chain(NETDEV_UP, ifa); +out: + if (unlikely(err < 0)) { + fib6_info_release(f6i); + + if (ifa) { + if (ifa->idev) + in6_dev_put(ifa->idev); + kfree(ifa); + } + ifa = ERR_PTR(err); + } + + return ifa; +} + +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 (ifa->prefix_len != ifp->prefix_len || + !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, bool del_peer) +{ + struct fib6_info *f6i; + + f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, + ifp->prefix_len, + ifp->idev->dev, 0, RTF_DEFAULT, true); + if (f6i) { + if (del_rt) + ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); + else { + if (!(f6i->fib6_flags & RTF_EXPIRES)) + fib6_set_expires(f6i, expires); + fib6_info_release(f6i); + } + } +} + + +/* This function wants to get referenced ifp and releases it before return */ + +static void ipv6_del_addr(struct inet6_ifaddr *ifp) +{ + enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; + struct net *net = dev_net(ifp->idev->dev); + unsigned long expires; + int state; + + 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(&net->ipv6.addrconf_hash_lock); + hlist_del_init_rcu(&ifp->addr_lst); + spin_unlock_bh(&net->ipv6.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_rcu(&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, false); + } + + /* clean up prefsrc entries */ + rt6_remove_prefsrc(ifp); +out: + in6_ifa_put(ifp); +} + +static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block) +{ + struct inet6_dev *idev = ifp->idev; + unsigned long tmp_tstamp, age; + unsigned long regen_advance; + unsigned long now = jiffies; + s32 cnf_temp_preferred_lft; + struct inet6_ifaddr *ift; + struct ifa6_config cfg; + long max_desync_factor; + struct in6_addr addr; + int ret = 0; + + write_lock_bh(&idev->lock); + +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_gen_rnd_iid(&addr); + + age = (now - ifp->tstamp) / HZ; + + regen_advance = idev->cnf.regen_max_retry * + idev->cnf.dad_transmits * + max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; + + /* recalculate max_desync_factor each time and update + * idev->desync_factor if it's larger + */ + cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); + max_desync_factor = min_t(long, + idev->cnf.max_desync_factor, + cnf_temp_preferred_lft - regen_advance); + + if (unlikely(idev->desync_factor > max_desync_factor)) { + if (max_desync_factor > 0) { + get_random_bytes(&idev->desync_factor, + sizeof(idev->desync_factor)); + idev->desync_factor %= max_desync_factor; + } else { + idev->desync_factor = 0; + } + } + + memset(&cfg, 0, sizeof(cfg)); + cfg.valid_lft = min_t(__u32, ifp->valid_lft, + idev->cnf.temp_valid_lft + age); + cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; + cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); + + cfg.plen = ifp->prefix_len; + tmp_tstamp = ifp->tstamp; + spin_unlock_bh(&ifp->lock); + + 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 (cfg.preferred_lft <= regen_advance + age) { + in6_ifa_put(ifp); + in6_dev_put(idev); + ret = -1; + goto out; + } + + cfg.ifa_flags = IFA_F_TEMPORARY; + /* set in addrconf_prefix_rcv() */ + if (ifp->flags & IFA_F_OPTIMISTIC) + cfg.ifa_flags |= IFA_F_OPTIMISTIC; + + cfg.pfx = &addr; + cfg.scope = ipv6_addr_scope(cfg.pfx); + + ift = ipv6_add_addr(idev, &cfg, block, NULL); + if (IS_ERR(ift)) { + in6_ifa_put(ifp); + in6_dev_put(idev); + pr_info("%s: retry temporary address regeneration\n", __func__); + 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 bool ipv6_use_optimistic_addr(struct net *net, + struct inet6_dev *idev) +{ +#ifdef CONFIG_IPV6_OPTIMISTIC_DAD + if (!idev) + return false; + if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) + return false; + if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) + return false; + + return true; +#else + return false; +#endif +} + +static bool ipv6_allow_optimistic_dad(struct net *net, + struct inet6_dev *idev) +{ +#ifdef CONFIG_IPV6_OPTIMISTIC_DAD + if (!idev) + return false; + if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) + return false; + + return true; +#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(net, 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; +} + +static int __ipv6_dev_get_saddr(struct net *net, + struct ipv6_saddr_dst *dst, + struct inet6_dev *idev, + struct ipv6_saddr_score *scores, + int hiscore_idx) +{ + struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; + + list_for_each_entry_rcu(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", + idev->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 out; + } + break; + } else if (minihiscore < miniscore) { + swap(hiscore, score); + hiscore_idx = 1 - hiscore_idx; + + /* restore our iterator */ + score->ifa = hiscore->ifa; + + break; + } + } + } +out: + return hiscore_idx; +} + +static int ipv6_get_saddr_master(struct net *net, + const struct net_device *dst_dev, + const struct net_device *master, + struct ipv6_saddr_dst *dst, + struct ipv6_saddr_score *scores, + int hiscore_idx) +{ + struct inet6_dev *idev; + + idev = __in6_dev_get(dst_dev); + if (idev) + hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, + scores, hiscore_idx); + + idev = __in6_dev_get(master); + if (idev) + hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, + scores, hiscore_idx); + + return hiscore_idx; +} + +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], *hiscore; + struct ipv6_saddr_dst dst; + struct inet6_dev *idev; + struct net_device *dev; + int dst_type; + bool use_oif_addr = false; + int hiscore_idx = 0; + int ret = 0; + + 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; + + scores[hiscore_idx].rule = -1; + scores[hiscore_idx].ifa = NULL; + + rcu_read_lock(); + + /* 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.) + * - "It is RECOMMENDED that the candidate source addresses + * be the set of unicast addresses assigned to the + * interface that will be used to send to the destination + * (the 'outgoing' interface)." (RFC 6724) + */ + if (dst_dev) { + idev = __in6_dev_get(dst_dev); + if ((dst_type & IPV6_ADDR_MULTICAST) || + dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || + (idev && idev->cnf.use_oif_addrs_only)) { + use_oif_addr = true; + } + } + + if (use_oif_addr) { + if (idev) + hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); + } else { + const struct net_device *master; + int master_idx = 0; + + /* if dst_dev exists and is enslaved to an L3 device, then + * prefer addresses from dst_dev and then the master over + * any other enslaved devices in the L3 domain. + */ + master = l3mdev_master_dev_rcu(dst_dev); + if (master) { + master_idx = master->ifindex; + + hiscore_idx = ipv6_get_saddr_master(net, dst_dev, + master, &dst, + scores, hiscore_idx); + + if (scores[hiscore_idx].ifa) + goto out; + } + + for_each_netdev_rcu(net, dev) { + /* only consider addresses on devices in the + * same L3 domain + */ + if (l3mdev_master_ifindex_rcu(dev) != master_idx) + continue; + idev = __in6_dev_get(dev); + if (!idev) + continue; + hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); + } + } + +out: + hiscore = &scores[hiscore_idx]; + if (!hiscore->ifa) + ret = -EADDRNOTAVAIL; + else + *saddr = hiscore->ifa->addr; + + rcu_read_unlock(); + return ret; +} +EXPORT_SYMBOL(ipv6_dev_get_saddr); + +static 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(const struct inet6_dev *idev) +{ + const struct inet6_ifaddr *ifp; + int cnt = 0; + + rcu_read_lock(); + list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) + cnt++; + rcu_read_unlock(); + 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, !dev, + strict, IFA_F_TENTATIVE); +} +EXPORT_SYMBOL(ipv6_chk_addr); + +/* device argument is used to find the L3 domain of interest. If + * skip_dev_check is set, then the ifp device is not checked against + * the passed in dev argument. So the 2 cases for addresses checks are: + * 1. does the address exist in the L3 domain that dev is part of + * (skip_dev_check = true), or + * + * 2. does the address exist on the specific device + * (skip_dev_check = false) + */ +static struct net_device * +__ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, + const struct net_device *dev, bool skip_dev_check, + int strict, u32 banned_flags) +{ + unsigned int hash = inet6_addr_hash(net, addr); + struct net_device *l3mdev, *ndev; + struct inet6_ifaddr *ifp; + u32 ifp_flags; + + rcu_read_lock(); + + l3mdev = l3mdev_master_dev_rcu(dev); + if (skip_dev_check) + dev = NULL; + + hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { + ndev = ifp->idev->dev; + + if (l3mdev_master_dev_rcu(ndev) != l3mdev) + 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 || ndev == dev || + !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { + rcu_read_unlock(); + return ndev; + } + } + + rcu_read_unlock(); + return NULL; +} + +int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, + const struct net_device *dev, bool skip_dev_check, + int strict, u32 banned_flags) +{ + return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check, + strict, banned_flags) ? 1 : 0; +} +EXPORT_SYMBOL(ipv6_chk_addr_and_flags); + + +/* 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) +{ + const struct inet6_ifaddr *ifa; + const struct inet6_dev *idev; + bool ret = false; + + rcu_read_lock(); + idev = __in6_dev_get(dev); + if (idev) { + list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { + ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); + if (ret) + break; + } + } + rcu_read_unlock(); + + return ret; +} +EXPORT_SYMBOL(ipv6_chk_custom_prefix); + +int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) +{ + const struct inet6_ifaddr *ifa; + const struct inet6_dev *idev; + int onlink; + + onlink = 0; + rcu_read_lock(); + idev = __in6_dev_get(dev); + if (idev) { + list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { + onlink = ipv6_prefix_equal(addr, &ifa->addr, + ifa->prefix_len); + if (onlink) + break; + } + } + rcu_read_unlock(); + return onlink; +} +EXPORT_SYMBOL(ipv6_chk_prefix); + +/** + * ipv6_dev_find - find the first device with a given source address. + * @net: the net namespace + * @addr: the source address + * @dev: used to find the L3 domain of interest + * + * The caller should be protected by RCU, or RTNL. + */ +struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, + struct net_device *dev) +{ + return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1, + IFA_F_TENTATIVE); +} +EXPORT_SYMBOL(ipv6_dev_find); + +struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, + struct net_device *dev, int strict) +{ + unsigned int hash = inet6_addr_hash(net, addr); + struct inet6_ifaddr *ifp, *result = NULL; + + rcu_read_lock(); + hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { + 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(); + + return result; +} + +/* Gets referenced address, destroys ifaddr */ + +static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) +{ + if (dad_failed) + ifp->flags |= IFA_F_DADFAILED; + + 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, true); + in6_ifa_put(ifpub); + } else { + spin_unlock_bh(&ifp->lock); + } + ipv6_del_addr(ifp); + } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { + spin_lock_bh(&ifp->lock); + addrconf_del_dad_work(ifp); + ifp->flags |= IFA_F_TENTATIVE; + if (dad_failed) + ifp->flags &= ~IFA_F_OPTIMISTIC; + spin_unlock_bh(&ifp->lock); + if (dad_failed) + ipv6_ifa_notify(0, ifp); + in6_ifa_put(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 sk_buff *skb, struct inet6_ifaddr *ifp) +{ + struct inet6_dev *idev = ifp->idev; + struct net *net = dev_net(idev->dev); + + if (addrconf_dad_end(ifp)) { + in6_ifa_put(ifp); + return; + } + + net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", + ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); + + spin_lock_bh(&ifp->lock); + + if (ifp->flags & IFA_F_STABLE_PRIVACY) { + struct in6_addr new_addr; + struct inet6_ifaddr *ifp2; + int retries = ifp->stable_privacy_retry + 1; + struct ifa6_config cfg = { + .pfx = &new_addr, + .plen = ifp->prefix_len, + .ifa_flags = ifp->flags, + .valid_lft = ifp->valid_lft, + .preferred_lft = ifp->prefered_lft, + .scope = ifp->scope, + }; + + 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; + + 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, &cfg, false, NULL); + 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); + } + +errdad: + /* transition from _POSTDAD to _ERRDAD */ + ifp->state = INET6_IFADDR_STATE_ERRDAD; + spin_unlock_bh(&ifp->lock); + + addrconf_mod_dad_work(ifp, 0); + in6_ifa_put(ifp); +} + +/* 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_6lowpan(u8 *eui, struct net_device *dev) +{ + switch (dev->addr_len) { + case ETH_ALEN: + memcpy(eui, dev->dev_addr, 3); + eui[3] = 0xFF; + eui[4] = 0xFE; + memcpy(eui + 5, dev->dev_addr + 3, 3); + break; + case EUI64_ADDR_LEN: + memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); + eui[0] ^= 2; + break; + default: + return -1; + } + + return 0; +} + +static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) +{ + const union fwnet_hwaddr *ha; + + if (dev->addr_len != FWNET_ALEN) + return -1; + + ha = (const 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: + case ARPHRD_TUNNEL: + return addrconf_ifid_gre(eui, dev); + case ARPHRD_6LOWPAN: + return addrconf_ifid_6lowpan(eui, dev); + case ARPHRD_IEEE1394: + return addrconf_ifid_ieee1394(eui, dev); + case ARPHRD_TUNNEL6: + case ARPHRD_IP6GRE: + case ARPHRD_RAWIP: + 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; +} + +/* Generation of a randomized Interface Identifier + * draft-ietf-6man-rfc4941bis, Section 3.3.1 + */ + +static void ipv6_gen_rnd_iid(struct in6_addr *addr) +{ +regen: + get_random_bytes(&addr->s6_addr[8], 8); + + /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1: + * check if generated address is not inappropriate: + * + * - Reserved IPv6 Interface Identifiers + * - XXX: already assigned to an address on the device + */ + + /* Subnet-router anycast: 0000:0000:0000:0000 */ + if (!(addr->s6_addr32[2] | addr->s6_addr32[3])) + goto regen; + + /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212 + * Proxy Mobile IPv6: 0200:5EFF:FE00:5213 + * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF + */ + if (ntohl(addr->s6_addr32[2]) == 0x02005eff && + (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000) + goto regen; + + /* Reserved subnet anycast addresses */ + if (ntohl(addr->s6_addr32[2]) == 0xfdffffff && + ntohl(addr->s6_addr32[3]) >= 0Xffffff80) + goto regen; +} + +/* + * Add prefix route. + */ + +static void +addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, + struct net_device *dev, unsigned long expires, + u32 flags, gfp_t gfp_flags) +{ + struct fib6_config cfg = { + .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, + .fc_metric = 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, + .fc_type = RTN_UNICAST, + }; + + 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, gfp_flags, NULL); +} + + +static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, + int plen, + const struct net_device *dev, + u32 flags, u32 noflags, + bool no_gw) +{ + struct fib6_node *fn; + struct fib6_info *rt = NULL; + struct fib6_table *table; + u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; + + table = fib6_get_table(dev_net(dev), tb_id); + if (!table) + return NULL; + + rcu_read_lock(); + fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); + if (!fn) + goto out; + + for_each_fib6_node_rt_rcu(fn) { + /* prefix routes only use builtin fib6_nh */ + if (rt->nh) + continue; + + if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) + continue; + if (no_gw && rt->fib6_nh->fib_nh_gw_family) + continue; + if ((rt->fib6_flags & flags) != flags) + continue; + if ((rt->fib6_flags & noflags) != 0) + continue; + if (!fib6_info_hold_safe(rt)) + continue; + break; + } +out: + rcu_read_unlock(); + return rt; +} + + +/* Create "default" multicast route to the interface */ + +static void addrconf_add_mroute(struct net_device *dev) +{ + struct fib6_config cfg = { + .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, + .fc_metric = IP6_RT_PRIO_ADDRCONF, + .fc_ifindex = dev->ifindex, + .fc_dst_len = 8, + .fc_flags = RTF_UP, + .fc_type = RTN_MULTICAST, + .fc_nlinfo.nl_net = dev_net(dev), + .fc_protocol = RTPROT_KERNEL, + }; + + ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); + + ip6_route_add(&cfg, GFP_KERNEL, NULL); +} + +static struct inet6_dev *addrconf_add_dev(struct net_device *dev) +{ + struct inet6_dev *idev; + + ASSERT_RTNL(); + + idev = ipv6_find_idev(dev); + if (IS_ERR(idev)) + return idev; + + if (idev->cnf.disable_ipv6) + return ERR_PTR(-EACCES); + + /* Add default multicast route */ + if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) + 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->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); + } + + /* Also create a temporary address if it's enabled but no temporary + * address currently exists. + * However, we get called with valid_lft == 0, prefered_lft == 0, create == false + * as part of cleanup (ie. deleting the mngtmpaddr). + * We don't want that to result in creating a new temporary ip address. + */ + if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft)) + create = true; + + if (create && idev->cnf.use_tempaddr > 0) { + /* When a new public address is created as described + * in [ADDRCONF], also create a new temporary address. + */ + read_unlock_bh(&idev->lock); + ipv6_create_tempaddr(ifp, false); + } else { + read_unlock_bh(&idev->lock); + } +} + +static bool is_addr_mode_generate_stable(struct inet6_dev *idev) +{ + return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || + idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; +} + +int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, + const struct prefix_info *pinfo, + struct inet6_dev *in6_dev, + const struct in6_addr *addr, int addr_type, + u32 addr_flags, bool sllao, bool tokenized, + __u32 valid_lft, u32 prefered_lft) +{ + struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); + int create = 0, update_lft = 0; + + if (!ifp && valid_lft) { + int max_addresses = in6_dev->cnf.max_addresses; + struct ifa6_config cfg = { + .pfx = addr, + .plen = pinfo->prefix_len, + .ifa_flags = addr_flags, + .valid_lft = valid_lft, + .preferred_lft = prefered_lft, + .scope = addr_type & IPV6_ADDR_SCOPE_MASK, + .ifa_proto = IFAPROT_KERNEL_RA + }; + +#ifdef CONFIG_IPV6_OPTIMISTIC_DAD + if ((net->ipv6.devconf_all->optimistic_dad || + in6_dev->cnf.optimistic_dad) && + !net->ipv6.devconf_all->forwarding && sllao) + cfg.ifa_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, &cfg, false, NULL); + + if (IS_ERR_OR_NULL(ifp)) + return -1; + + 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 (!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(net); + } + + return 0; +} +EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); + +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, err; + 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)) { + netdev_dbg(dev, "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; + } + + if (valid_lft != 0 && valid_lft < in6_dev->cnf.accept_ra_min_lft) + goto put; + + /* + * Two things going on here: + * 1) Add routes for on-link prefixes + * 2) Configure prefixes with the auto flag set + */ + + if (pinfo->onlink) { + struct fib6_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_DEFAULT, true); + + if (rt) { + /* Autoconf prefix route */ + if (valid_lft == 0) { + ip6_del_rt(net, rt, false); + rt = NULL; + } else if (addrconf_finite_timeout(rt_expires)) { + /* not infinity */ + fib6_set_expires(rt, jiffies + rt_expires); + } else { + fib6_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, + 0, dev, expires, flags, + GFP_ATOMIC); + } + fib6_info_release(rt); + } + + /* Try to figure out our local address for this prefix */ + + if (pinfo->autoconf && in6_dev->cnf.autoconf) { + struct in6_addr addr; + bool tokenized = false, dev_addr_generated = 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 (is_addr_mode_generate_stable(in6_dev) && + !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)) { + goto put; + } else { + dev_addr_generated = true; + } + goto ok; + } + net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", + pinfo->prefix_len); + goto put; + +ok: + err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, + &addr, addr_type, + addr_flags, sllao, + tokenized, valid_lft, + prefered_lft); + if (err) + goto put; + + /* Ignore error case here because previous prefix add addr was + * successful which will be notified. + */ + ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, + addr_type, addr_flags, sllao, + tokenized, valid_lft, + prefered_lft, + dev_addr_generated); + } + inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); +put: + in6_dev_put(in6_dev); +} + +static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, + struct in6_ifreq *ireq) +{ + struct ip_tunnel_parm p = { }; + int err; + + if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) + return -EADDRNOTAVAIL; + + p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; + p.iph.version = 4; + p.iph.ihl = 5; + p.iph.protocol = IPPROTO_IPV6; + p.iph.ttl = 64; + + if (!dev->netdev_ops->ndo_tunnel_ctl) + return -EOPNOTSUPP; + err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); + if (err) + return err; + + dev = __dev_get_by_name(net, p.name); + if (!dev) + return -ENOBUFS; + return dev_open(dev, NULL); +} + +/* + * 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 net_device *dev; + struct in6_ifreq ireq; + int err = -ENODEV; + + if (!IS_ENABLED(CONFIG_IPV6_SIT)) + return -ENODEV; + if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) + return -EFAULT; + + rtnl_lock(); + dev = __dev_get_by_index(net, ireq.ifr6_ifindex); + if (dev && dev->type == ARPHRD_SIT) + err = addrconf_set_sit_dstaddr(net, dev, &ireq); + 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, + struct ifa6_config *cfg, + struct netlink_ext_ack *extack) +{ + struct inet6_ifaddr *ifp; + struct inet6_dev *idev; + struct net_device *dev; + unsigned long timeout; + clock_t expires; + u32 flags; + + ASSERT_RTNL(); + + if (cfg->plen > 128) + return -EINVAL; + + /* check the lifetime */ + if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) + return -EINVAL; + + if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->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 (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { + int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, + true, cfg->pfx, ifindex); + + if (ret < 0) + return ret; + } + + cfg->scope = ipv6_addr_scope(cfg->pfx); + + timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); + if (addrconf_finite_timeout(timeout)) { + expires = jiffies_to_clock_t(timeout * HZ); + cfg->valid_lft = timeout; + flags = RTF_EXPIRES; + } else { + expires = 0; + flags = 0; + cfg->ifa_flags |= IFA_F_PERMANENT; + } + + timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); + if (addrconf_finite_timeout(timeout)) { + if (timeout == 0) + cfg->ifa_flags |= IFA_F_DEPRECATED; + cfg->preferred_lft = timeout; + } + + ifp = ipv6_add_addr(idev, cfg, true, extack); + if (!IS_ERR(ifp)) { + if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { + addrconf_prefix_route(&ifp->addr, ifp->prefix_len, + ifp->rt_priority, dev, expires, + flags, GFP_KERNEL); + } + + /* Send a netlink notification if DAD is enabled and + * optimistic flag is not set + */ + if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) + ipv6_ifa_notify(0, ifp); + /* + * 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 (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) + manage_tempaddrs(idev, ifp, cfg->valid_lft, + cfg->preferred_lft, true, jiffies); + in6_ifa_put(ifp); + addrconf_verify_rtnl(net); + return 0; + } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { + ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, + cfg->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(net); + 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 ifa6_config cfg = { + .ifa_flags = IFA_F_PERMANENT, + .preferred_lft = INFINITY_LIFE_TIME, + .valid_lft = INFINITY_LIFE_TIME, + }; + 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; + + cfg.pfx = &ireq.ifr6_addr; + cfg.plen = ireq.ifr6_prefixlen; + + rtnl_lock(); + err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); + 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, u8 proto) +{ + struct inet6_ifaddr *ifp; + struct ifa6_config cfg = { + .pfx = addr, + .plen = plen, + .ifa_flags = IFA_F_PERMANENT, + .valid_lft = INFINITY_LIFE_TIME, + .preferred_lft = INFINITY_LIFE_TIME, + .scope = scope, + .ifa_proto = proto + }; + + ifp = ipv6_add_addr(idev, &cfg, true, NULL); + if (!IS_ERR(ifp)) { + spin_lock_bh(&ifp->lock); + ifp->flags &= ~IFA_F_TENTATIVE; + spin_unlock_bh(&ifp->lock); + rt_genid_bump_ipv6(dev_net(idev->dev)); + ipv6_ifa_notify(RTM_NEWADDR, ifp); + in6_ifa_put(ifp); + } +} + +#if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) +static void 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, offset = 0; + u32 pflags = 0; + + ASSERT_RTNL(); + + memset(&addr, 0, sizeof(struct in6_addr)); + /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */ + if (idev->dev->addr_len == sizeof(struct in6_addr)) + offset = sizeof(struct in6_addr) - 4; + memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4); + + if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) { + scope = IPV6_ADDR_COMPATv4; + plen = 96; + pflags |= RTF_NONEXTHOP; + } else { + if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE) + return; + + addr.s6_addr32[0] = htonl(0xfe800000); + scope = IFA_LINK; + plen = 64; + } + + if (addr.s6_addr32[3]) { + add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC); + addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, + GFP_KERNEL); + 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; + + in_dev_for_each_ifa_rtnl(ifa, in_dev) { + 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, + IFAPROT_UNSPEC); + addrconf_prefix_route(&addr, plen, 0, idev->dev, + 0, pflags, GFP_KERNEL); + } + } + } +} +#endif + +static void init_loopback(struct net_device *dev) +{ + struct inet6_dev *idev; + + /* ::1 */ + + ASSERT_RTNL(); + + idev = ipv6_find_idev(dev); + if (IS_ERR(idev)) { + pr_debug("%s: add_dev failed\n", __func__); + return; + } + + add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO); +} + +void addrconf_add_linklocal(struct inet6_dev *idev, + const struct in6_addr *addr, u32 flags) +{ + struct ifa6_config cfg = { + .pfx = addr, + .plen = 64, + .ifa_flags = flags | IFA_F_PERMANENT, + .valid_lft = INFINITY_LIFE_TIME, + .preferred_lft = INFINITY_LIFE_TIME, + .scope = IFA_LINK, + .ifa_proto = IFAPROT_KERNEL_LL + }; + struct inet6_ifaddr *ifp; + +#ifdef CONFIG_IPV6_OPTIMISTIC_DAD + if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || + idev->cnf.optimistic_dad) && + !dev_net(idev->dev)->ipv6.devconf_all->forwarding) + cfg.ifa_flags |= IFA_F_OPTIMISTIC; +#endif + + ifp = ipv6_add_addr(idev, &cfg, true, NULL); + if (!IS_ERR(ifp)) { + addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, + 0, 0, GFP_ATOMIC); + addrconf_dad_start(ifp); + in6_ifa_put(ifp); + } +} +EXPORT_SYMBOL_GPL(addrconf_add_linklocal); + +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[SHA1_DIGEST_WORDS]; + static __u32 workspace[SHA1_WORKSPACE_WORDS]; + + static union { + char __data[SHA1_BLOCK_SIZE]; + 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); + + sha1_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; + + sha1_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 ipv6_gen_mode_random_init(struct inet6_dev *idev) +{ + struct ipv6_stable_secret *s = &idev->cnf.stable_secret; + + if (s->initialized) + return; + s = &idev->cnf.stable_secret; + get_random_bytes(&s->secret, sizeof(s->secret)); + s->initialized = true; +} + +static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) +{ + struct in6_addr addr; + + /* no link local addresses on L3 master devices */ + if (netif_is_l3_master(idev->dev)) + return; + + /* no link local addresses on devices flagged as slaves */ + if (idev->dev->flags & IFF_SLAVE) + return; + + ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); + + switch (idev->cnf.addr_gen_mode) { + case IN6_ADDR_GEN_MODE_RANDOM: + ipv6_gen_mode_random_init(idev); + fallthrough; + case 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, 0, idev->dev, + 0, 0, GFP_KERNEL); + break; + case 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, 0, idev->dev, + 0, 0, GFP_KERNEL); + break; + case IN6_ADDR_GEN_MODE_NONE: + default: + /* will not add any link local address */ + break; + } +} + +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_IEEE1394) && + (dev->type != ARPHRD_TUNNEL6) && + (dev->type != ARPHRD_6LOWPAN) && + (dev->type != ARPHRD_TUNNEL) && + (dev->type != ARPHRD_NONE) && + (dev->type != ARPHRD_RAWIP)) { + /* Alas, we support only Ethernet autoconfiguration. */ + idev = __in6_dev_get(dev); + if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && + dev->flags & IFF_MULTICAST) + ipv6_mc_up(idev); + return; + } + + idev = addrconf_add_dev(dev); + if (IS_ERR(idev)) + return; + + /* this device type has no EUI support */ + if (dev->type == ARPHRD_NONE && + idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) + idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; + + 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 (IS_ERR(idev)) { + pr_debug("%s: add_dev failed\n", __func__); + return; + } + + if (dev->priv_flags & IFF_ISATAP) { + addrconf_addr_gen(idev, false); + return; + } + + add_v4_addrs(idev); + + if (dev->flags&IFF_POINTOPOINT) + addrconf_add_mroute(dev); +} +#endif + +#if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) +static void addrconf_gre_config(struct net_device *dev) +{ + struct inet6_dev *idev; + + ASSERT_RTNL(); + + idev = ipv6_find_idev(dev); + if (IS_ERR(idev)) { + pr_debug("%s: add_dev failed\n", __func__); + return; + } + + if (dev->type == ARPHRD_ETHER) { + addrconf_addr_gen(idev, true); + return; + } + + add_v4_addrs(idev); + + if (dev->flags & IFF_POINTOPOINT) + addrconf_add_mroute(dev); +} +#endif + +static void addrconf_init_auto_addrs(struct net_device *dev) +{ + switch (dev->type) { +#if IS_ENABLED(CONFIG_IPV6_SIT) + case ARPHRD_SIT: + addrconf_sit_config(dev); + break; +#endif +#if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) + case ARPHRD_IP6GRE: + case ARPHRD_IPGRE: + addrconf_gre_config(dev); + break; +#endif + case ARPHRD_LOOPBACK: + init_loopback(dev); + break; + + default: + addrconf_dev_config(dev); + break; + } +} + +static int fixup_permanent_addr(struct net *net, + struct inet6_dev *idev, + struct inet6_ifaddr *ifp) +{ + /* !fib6_node means the host route was removed from the + * FIB, for example, if 'lo' device is taken down. In that + * case regenerate the host route. + */ + if (!ifp->rt || !ifp->rt->fib6_node) { + struct fib6_info *f6i, *prev; + + f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, + GFP_ATOMIC); + if (IS_ERR(f6i)) + return PTR_ERR(f6i); + + /* ifp->rt can be accessed outside of rtnl */ + spin_lock(&ifp->lock); + prev = ifp->rt; + ifp->rt = f6i; + spin_unlock(&ifp->lock); + + fib6_info_release(prev); + } + + if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { + addrconf_prefix_route(&ifp->addr, ifp->prefix_len, + ifp->rt_priority, idev->dev, 0, 0, + GFP_ATOMIC); + } + + if (ifp->state == INET6_IFADDR_STATE_PREDAD) + addrconf_dad_start(ifp); + + return 0; +} + +static void addrconf_permanent_addr(struct net *net, struct net_device *dev) +{ + struct inet6_ifaddr *ifp, *tmp; + struct inet6_dev *idev; + + idev = __in6_dev_get(dev); + if (!idev) + return; + + write_lock_bh(&idev->lock); + + list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { + if ((ifp->flags & IFA_F_PERMANENT) && + fixup_permanent_addr(net, idev, ifp) < 0) { + write_unlock_bh(&idev->lock); + in6_ifa_hold(ifp); + ipv6_del_addr(ifp); + write_lock_bh(&idev->lock); + + net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", + idev->dev->name, &ifp->addr); + } + } + + write_unlock_bh(&idev->lock); +} + +static int addrconf_notify(struct notifier_block *this, unsigned long event, + void *ptr) +{ + struct net_device *dev = netdev_notifier_info_to_dev(ptr); + struct netdev_notifier_change_info *change_info; + struct netdev_notifier_changeupper_info *info; + struct inet6_dev *idev = __in6_dev_get(dev); + struct net *net = dev_net(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_CHANGEMTU: + /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ + if (dev->mtu < IPV6_MIN_MTU) { + addrconf_ifdown(dev, dev != net->loopback_dev); + break; + } + + if (idev) { + rt6_mtu_change(dev, dev->mtu); + idev->cnf.mtu6 = dev->mtu; + break; + } + + /* allocate new idev */ + idev = ipv6_add_dev(dev); + if (IS_ERR(idev)) + break; + + /* device is still not ready */ + if (!(idev->if_flags & IF_READY)) + break; + + run_pending = 1; + fallthrough; + case NETDEV_UP: + case NETDEV_CHANGE: + if (idev && idev->cnf.disable_ipv6) + break; + + if (dev->flags & IFF_SLAVE) { + if (event == NETDEV_UP && !IS_ERR_OR_NULL(idev) && + dev->flags & IFF_UP && dev->flags & IFF_MULTICAST) + ipv6_mc_up(idev); + break; + } + + if (event == NETDEV_UP) { + /* restore routes for permanent addresses */ + addrconf_permanent_addr(net, dev); + + if (!addrconf_link_ready(dev)) { + /* device is not ready yet. */ + pr_debug("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 (event == NETDEV_CHANGE) { + if (!addrconf_link_ready(dev)) { + /* device is still not ready. */ + rt6_sync_down_dev(dev, event); + break; + } + + if (!IS_ERR_OR_NULL(idev)) { + if (idev->if_flags & IF_READY) { + /* device is already configured - + * but resend MLD reports, we might + * have roamed and need to update + * multicast snooping switches + */ + ipv6_mc_up(idev); + change_info = ptr; + if (change_info->flags_changed & IFF_NOARP) + addrconf_dad_run(idev, true); + rt6_sync_up(dev, RTNH_F_LINKDOWN); + break; + } + idev->if_flags |= IF_READY; + } + + pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", + dev->name); + + run_pending = 1; + } + + addrconf_init_auto_addrs(dev); + + if (!IS_ERR_OR_NULL(idev)) { + if (run_pending) + addrconf_dad_run(idev, false); + + /* Device has an address by now */ + rt6_sync_up(dev, RTNH_F_DEAD); + + /* + * 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, dev != net->loopback_dev); + } + break; + + 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: + if (idev) + addrconf_type_change(dev, event); + break; + + case NETDEV_CHANGEUPPER: + info = ptr; + + /* flush all routes if dev is linked to or unlinked from + * an L3 master device (e.g., VRF) + */ + if (info->upper_dev && netif_is_l3_master(info->upper_dev)) + addrconf_ifdown(dev, false); + } + + return NOTIFY_OK; +} + +/* + * addrconf module should be notified of a device going up + */ +static struct notifier_block ipv6_dev_notf = { + .notifier_call = addrconf_notify, + .priority = ADDRCONF_NOTIFY_PRIORITY, +}; + +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 bool addr_is_local(const struct in6_addr *addr) +{ + return ipv6_addr_type(addr) & + (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); +} + +static int addrconf_ifdown(struct net_device *dev, bool unregister) +{ + unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN; + struct net *net = dev_net(dev); + struct inet6_dev *idev; + struct inet6_ifaddr *ifa; + LIST_HEAD(tmp_addr_list); + bool keep_addr = false; + bool was_ready; + int state, i; + + ASSERT_RTNL(); + + rt6_disable_ip(dev, event); + + idev = __in6_dev_get(dev); + if (!idev) + return -ENODEV; + + /* + * Step 1: remove reference to ipv6 device from parent device. + * Do not dev_put! + */ + if (unregister) { + idev->dead = 1; + + /* protected by rtnl_lock */ + RCU_INIT_POINTER(dev->ip6_ptr, NULL); + + /* Step 1.5: remove snmp6 entry */ + snmp6_unregister_dev(idev); + + } + + /* combine the user config with event to determine if permanent + * addresses are to be removed from address hash table + */ + if (!unregister && !idev->cnf.disable_ipv6) { + /* aggregate the system setting and interface setting */ + int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; + + if (!_keep_addr) + _keep_addr = idev->cnf.keep_addr_on_down; + + keep_addr = (_keep_addr > 0); + } + + /* Step 2: clear hash table */ + for (i = 0; i < IN6_ADDR_HSIZE; i++) { + struct hlist_head *h = &net->ipv6.inet6_addr_lst[i]; + + spin_lock_bh(&net->ipv6.addrconf_hash_lock); +restart: + hlist_for_each_entry_rcu(ifa, h, addr_lst) { + if (ifa->idev == idev) { + addrconf_del_dad_work(ifa); + /* combined flag + permanent flag decide if + * address is retained on a down event + */ + if (!keep_addr || + !(ifa->flags & IFA_F_PERMANENT) || + addr_is_local(&ifa->addr)) { + hlist_del_init_rcu(&ifa->addr_lst); + goto restart; + } + } + } + spin_unlock_bh(&net->ipv6.addrconf_hash_lock); + } + + write_lock_bh(&idev->lock); + + addrconf_del_rs_timer(idev); + + /* Step 2: clear flags for stateless addrconf, repeated down + * detection + */ + was_ready = idev->if_flags & IF_READY; + if (!unregister) + idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); + + /* 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); + } + + list_for_each_entry(ifa, &idev->addr_list, if_list) + list_add_tail(&ifa->if_list_aux, &tmp_addr_list); + write_unlock_bh(&idev->lock); + + while (!list_empty(&tmp_addr_list)) { + struct fib6_info *rt = NULL; + bool keep; + + ifa = list_first_entry(&tmp_addr_list, + struct inet6_ifaddr, if_list_aux); + list_del(&ifa->if_list_aux); + + addrconf_del_dad_work(ifa); + + keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && + !addr_is_local(&ifa->addr); + + spin_lock_bh(&ifa->lock); + + if (keep) { + /* set state to skip the notifier below */ + state = INET6_IFADDR_STATE_DEAD; + ifa->state = INET6_IFADDR_STATE_PREDAD; + if (!(ifa->flags & IFA_F_NODAD)) + ifa->flags |= IFA_F_TENTATIVE; + + rt = ifa->rt; + ifa->rt = NULL; + } else { + state = ifa->state; + ifa->state = INET6_IFADDR_STATE_DEAD; + } + + spin_unlock_bh(&ifa->lock); + + if (rt) + ip6_del_rt(net, rt, false); + + if (state != INET6_IFADDR_STATE_DEAD) { + __ipv6_ifa_notify(RTM_DELADDR, ifa); + inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); + } else { + if (idev->cnf.forwarding) + addrconf_leave_anycast(ifa); + addrconf_leave_solict(ifa->idev, &ifa->addr); + } + + if (!keep) { + write_lock_bh(&idev->lock); + list_del_rcu(&ifa->if_list); + write_unlock_bh(&idev->lock); + in6_ifa_put(ifa); + } + } + + /* Step 5: Discard anycast and multicast list */ + if (unregister) { + ipv6_ac_destroy_dev(idev); + ipv6_mc_destroy_dev(idev); + } else if (was_ready) { + ipv6_mc_down(idev); + } + + idev->tstamp = jiffies; + idev->ra_mtu = 0; + + /* Last: Shot the device (if unregistered) */ + if (unregister) { + 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(struct timer_list *t) +{ + struct inet6_dev *idev = from_timer(idev, t, rs_timer); + 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 || idev->cnf.rtr_solicits < 0) { + 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); + idev->rs_interval = rfc3315_s14_backoff_update( + idev->rs_interval, idev->cnf.rtr_solicit_max_interval); + /* 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->rs_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; + u64 nonce; + + if (ifp->flags & IFA_F_OPTIMISTIC) + rand_num = 0; + else + rand_num = prandom_u32_max(idev->cnf.rtr_solicit_delay ?: 1); + + nonce = 0; + if (idev->cnf.enhanced_dad || + dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { + do + get_random_bytes(&nonce, 6); + while (nonce == 0); + } + ifp->dad_nonce = nonce; + 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; + bool bump_id, notify = false; + struct net *net; + + addrconf_join_solict(dev, &ifp->addr); + + read_lock_bh(&idev->lock); + spin_lock(&ifp->lock); + if (ifp->state == INET6_IFADDR_STATE_DEAD) + goto out; + + net = dev_net(dev); + if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || + (net->ipv6.devconf_all->accept_dad < 1 && + idev->cnf.accept_dad < 1) || + !(ifp->flags&IFA_F_TENTATIVE) || + ifp->flags & IFA_F_NODAD) { + bool send_na = false; + + if (ifp->flags & IFA_F_TENTATIVE && + !(ifp->flags & IFA_F_OPTIMISTIC)) + send_na = true; + bump_id = ifp->flags & IFA_F_TENTATIVE; + ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); + spin_unlock(&ifp->lock); + read_unlock_bh(&idev->lock); + + addrconf_dad_completed(ifp, bump_id, send_na); + 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(net, ifp->rt); + if (ipv6_use_optimistic_addr(net, idev)) { + /* Because optimistic nodes can use this address, + * notify listeners. If DAD fails, RTM_DELADDR is sent. + */ + notify = true; + } + } + + addrconf_dad_kick(ifp); +out: + spin_unlock(&ifp->lock); + read_unlock_bh(&idev->lock); + if (notify) + ipv6_ifa_notify(RTM_NEWADDR, ifp); +} + +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; + bool bump_id, disable_ipv6 = false; + 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; + + if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || + idev->cnf.accept_dad > 1) && + !idev->cnf.disable_ipv6 && + !(ifp->flags & IFA_F_STABLE_PRIVACY)) { + struct in6_addr addr; + + 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 */ + idev->cnf.disable_ipv6 = 1; + + pr_info("%s: IPv6 being disabled!\n", + ifp->idev->dev->name); + disable_ipv6 = true; + } + } + } + spin_unlock_bh(&ifp->lock); + + if (action == DAD_BEGIN) { + addrconf_dad_begin(ifp); + goto out; + } else if (action == DAD_ABORT) { + in6_ifa_hold(ifp); + addrconf_dad_stop(ifp, 1); + if (disable_ipv6) + addrconf_ifdown(idev->dev, false); + 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) { + bool send_na = false; + + /* + * DAD was successful + */ + + if (ifp->flags & IFA_F_TENTATIVE && + !(ifp->flags & IFA_F_OPTIMISTIC)) + send_na = true; + bump_id = ifp->flags & IFA_F_TENTATIVE; + ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); + spin_unlock(&ifp->lock); + write_unlock_bh(&idev->lock); + + addrconf_dad_completed(ifp, bump_id, send_na); + + goto out; + } + + ifp->dad_probes--; + addrconf_mod_dad_work(ifp, + max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), + HZ/100)); + 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, &ifp->addr, &mcaddr, &in6addr_any, + ifp->dad_nonce); +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, bool bump_id, + bool send_na) +{ + 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 && + (dev->type != ARPHRD_TUNNEL); + 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); + + /* send unsolicited NA if enabled */ + if (send_na && + (ifp->idev->cnf.ndisc_notify || + dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { + ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, + /*router=*/ !!ifp->idev->cnf.forwarding, + /*solicited=*/ false, /*override=*/ true, + /*inc_opt=*/ true); + } + + 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_interval = rfc3315_s14_backoff_init( + ifp->idev->cnf.rtr_solicit_interval); + ifp->idev->rs_probes = 1; + ifp->idev->if_flags |= IF_RS_SENT; + addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); + spin_unlock(&ifp->lock); + write_unlock_bh(&ifp->idev->lock); + } + + if (bump_id) + rt_genid_bump_ipv6(dev_net(dev)); + + /* Make sure that a new temporary address will be created + * before this temporary address becomes deprecated. + */ + if (ifp->flags & IFA_F_TEMPORARY) + addrconf_verify_rtnl(dev_net(dev)); +} + +static void addrconf_dad_run(struct inet6_dev *idev, bool restart) +{ + 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) || restart) { + if (restart) + ifp->state = INET6_IFADDR_STATE_PREDAD; + 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 if6_iter_state *state = seq->private; + struct net *net = seq_file_net(seq); + struct inet6_ifaddr *ifa = NULL; + 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(ifa, &net->ipv6.inet6_addr_lst[state->bucket], + addr_lst) { + /* sync with offset */ + if (p < state->offset) { + p++; + continue; + } + 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(ifa, addr_lst) { + state->offset++; + return ifa; + } + + state->offset = 0; + while (++state->bucket < IN6_ADDR_HSIZE) { + hlist_for_each_entry_rcu(ifa, + &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) { + return ifa; + } + } + + return NULL; +} + +static void *if6_seq_start(struct seq_file *seq, loff_t *pos) + __acquires(rcu) +{ + rcu_read_lock(); + 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) +{ + rcu_read_unlock(); +} + +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 __net_init if6_proc_net_init(struct net *net) +{ + if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, + sizeof(struct if6_iter_state))) + 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) +{ + unsigned int hash = inet6_addr_hash(net, addr); + struct inet6_ifaddr *ifp = NULL; + int ret = 0; + + rcu_read_lock(); + hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { + if (ipv6_addr_equal(&ifp->addr, addr) && + (ifp->flags & IFA_F_HOMEADDRESS)) { + ret = 1; + break; + } + } + rcu_read_unlock(); + return ret; +} +#endif + +/* RFC6554 has some algorithm to avoid loops in segment routing by + * checking if the segments contains any of a local interface address. + * + * Quote: + * + * To detect loops in the SRH, a router MUST determine if the SRH + * includes multiple addresses assigned to any interface on that router. + * If such addresses appear more than once and are separated by at least + * one address not assigned to that router. + */ +int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, + unsigned char nsegs) +{ + const struct in6_addr *addr; + int i, ret = 0, found = 0; + struct inet6_ifaddr *ifp; + bool separated = false; + unsigned int hash; + bool hash_found; + + rcu_read_lock(); + for (i = 0; i < nsegs; i++) { + addr = &segs[i]; + hash = inet6_addr_hash(net, addr); + + hash_found = false; + hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { + + if (ipv6_addr_equal(&ifp->addr, addr)) { + hash_found = true; + break; + } + } + + if (hash_found) { + if (found > 1 && separated) { + ret = 1; + break; + } + + separated = false; + found++; + } else { + separated = true; + } + } + rcu_read_unlock(); + + return ret; +} + +/* + * Periodic address status verification + */ + +static void addrconf_verify_rtnl(struct net *net) +{ + 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(&net->ipv6.addr_chk_work); + + for (i = 0; i < IN6_ADDR_HSIZE; i++) { +restart: + hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.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->flags&IFA_F_TEMPORARY) && + !(ifp->flags&IFA_F_TENTATIVE) && + ifp->prefered_lft != INFINITY_LIFE_TIME && + !ifp->regen_count && ifp->ifpub) { + /* This is a non-regenerated temporary addr. */ + + unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * + ifp->idev->cnf.dad_transmits * + max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; + + if (age + regen_advance >= ifp->prefered_lft) { + struct inet6_ifaddr *ifpub = ifp->ifpub; + if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) + next = ifp->tstamp + ifp->prefered_lft * HZ; + + 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); + rcu_read_unlock_bh(); + ipv6_create_tempaddr(ifpub, true); + in6_ifa_put(ifpub); + in6_ifa_put(ifp); + rcu_read_lock_bh(); + 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; + } + + if (ifp->valid_lft != INFINITY_LIFE_TIME && + age >= ifp->valid_lft) { + spin_unlock(&ifp->lock); + in6_ifa_hold(ifp); + rcu_read_unlock_bh(); + ipv6_del_addr(ifp); + rcu_read_lock_bh(); + 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 { + /* 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; + + pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", + now, next, next_sec, next_sched); + mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now); + rcu_read_unlock_bh(); +} + +static void addrconf_verify_work(struct work_struct *w) +{ + struct net *net = container_of(to_delayed_work(w), struct net, + ipv6.addr_chk_work); + + rtnl_lock(); + addrconf_verify_rtnl(net); + rtnl_unlock(); +} + +static void addrconf_verify(struct net *net) +{ + mod_delayed_work(addrconf_wq, &net->ipv6.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) }, + [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, + [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, + [IFA_PROTO] = { .type = NLA_U8 }, +}; + +static int +inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, + struct netlink_ext_ack *extack) +{ + 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_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, + ifa_ipv6_policy, extack); + 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 modify_prefix_route(struct inet6_ifaddr *ifp, + unsigned long expires, u32 flags, + bool modify_peer) +{ + struct fib6_info *f6i; + u32 prio; + + f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, + ifp->prefix_len, + ifp->idev->dev, 0, RTF_DEFAULT, true); + if (!f6i) + return -ENOENT; + + prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; + if (f6i->fib6_metric != prio) { + /* delete old one */ + ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); + + /* add new one */ + addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, + ifp->prefix_len, + ifp->rt_priority, ifp->idev->dev, + expires, flags, GFP_KERNEL); + } else { + if (!expires) + fib6_clean_expires(f6i); + else + fib6_set_expires(f6i, expires); + + fib6_info_release(f6i); + } + + return 0; +} + +static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp, + struct ifa6_config *cfg) +{ + u32 flags; + clock_t expires; + unsigned long timeout; + bool was_managetempaddr; + bool had_prefixroute; + bool new_peer = false; + + ASSERT_RTNL(); + + if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) + return -EINVAL; + + if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && + (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) + return -EINVAL; + + if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) + cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; + + timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); + if (addrconf_finite_timeout(timeout)) { + expires = jiffies_to_clock_t(timeout * HZ); + cfg->valid_lft = timeout; + flags = RTF_EXPIRES; + } else { + expires = 0; + flags = 0; + cfg->ifa_flags |= IFA_F_PERMANENT; + } + + timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); + if (addrconf_finite_timeout(timeout)) { + if (timeout == 0) + cfg->ifa_flags |= IFA_F_DEPRECATED; + cfg->preferred_lft = timeout; + } + + if (cfg->peer_pfx && + memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { + if (!ipv6_addr_any(&ifp->peer_addr)) + cleanup_prefix_route(ifp, expires, true, true); + new_peer = true; + } + + 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 |= cfg->ifa_flags; + ifp->tstamp = jiffies; + ifp->valid_lft = cfg->valid_lft; + ifp->prefered_lft = cfg->preferred_lft; + ifp->ifa_proto = cfg->ifa_proto; + + if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) + ifp->rt_priority = cfg->rt_priority; + + if (new_peer) + ifp->peer_addr = *cfg->peer_pfx; + + spin_unlock_bh(&ifp->lock); + if (!(ifp->flags&IFA_F_TENTATIVE)) + ipv6_ifa_notify(0, ifp); + + if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { + int rc = -ENOENT; + + if (had_prefixroute) + rc = modify_prefix_route(ifp, expires, flags, false); + + /* prefix route could have been deleted; if so restore it */ + if (rc == -ENOENT) { + addrconf_prefix_route(&ifp->addr, ifp->prefix_len, + ifp->rt_priority, ifp->idev->dev, + expires, flags, GFP_KERNEL); + } + + if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) + rc = modify_prefix_route(ifp, expires, flags, true); + + if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { + addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, + ifp->rt_priority, ifp->idev->dev, + expires, flags, GFP_KERNEL); + } + } 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, false); + } + } + + if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { + if (was_managetempaddr && + !(ifp->flags & IFA_F_MANAGETEMPADDR)) { + cfg->valid_lft = 0; + cfg->preferred_lft = 0; + } + manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, + cfg->preferred_lft, !was_managetempaddr, + jiffies); + } + + addrconf_verify_rtnl(net); + + return 0; +} + +static int +inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, + struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(skb->sk); + struct ifaddrmsg *ifm; + struct nlattr *tb[IFA_MAX+1]; + struct in6_addr *peer_pfx; + struct inet6_ifaddr *ifa; + struct net_device *dev; + struct inet6_dev *idev; + struct ifa6_config cfg; + int err; + + err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, + ifa_ipv6_policy, extack); + if (err < 0) + return err; + + memset(&cfg, 0, sizeof(cfg)); + + ifm = nlmsg_data(nlh); + cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); + if (!cfg.pfx) + return -EINVAL; + + cfg.peer_pfx = peer_pfx; + cfg.plen = ifm->ifa_prefixlen; + if (tb[IFA_RT_PRIORITY]) + cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); + + if (tb[IFA_PROTO]) + cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]); + + cfg.valid_lft = INFINITY_LIFE_TIME; + cfg.preferred_lft = INFINITY_LIFE_TIME; + + if (tb[IFA_CACHEINFO]) { + struct ifa_cacheinfo *ci; + + ci = nla_data(tb[IFA_CACHEINFO]); + cfg.valid_lft = ci->ifa_valid; + cfg.preferred_lft = ci->ifa_prefered; + } + + dev = __dev_get_by_index(net, ifm->ifa_index); + if (!dev) + return -ENODEV; + + if (tb[IFA_FLAGS]) + cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); + else + cfg.ifa_flags = ifm->ifa_flags; + + /* We ignore other flags so far. */ + cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | + IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | + IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; + + idev = ipv6_find_idev(dev); + if (IS_ERR(idev)) + return PTR_ERR(idev); + + if (!ipv6_allow_optimistic_dad(net, idev)) + cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; + + if (cfg.ifa_flags & IFA_F_NODAD && + cfg.ifa_flags & IFA_F_OPTIMISTIC) { + NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); + return -EINVAL; + } + + ifa = ipv6_get_ifaddr(net, cfg.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, &cfg, extack); + } + + if (nlh->nlmsg_flags & NLM_F_EXCL || + !(nlh->nlmsg_flags & NLM_F_REPLACE)) + err = -EEXIST; + else + err = inet6_addr_modify(net, ifa, &cfg); + + 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 */ + + nla_total_size(1) /* IFA_PROTO */ + + nla_total_size(4) /* IFA_RT_PRIORITY */; +} + +enum addr_type_t { + UNICAST_ADDR, + MULTICAST_ADDR, + ANYCAST_ADDR, +}; + +struct inet6_fill_args { + u32 portid; + u32 seq; + int event; + unsigned int flags; + int netnsid; + int ifindex; + enum addr_type_t type; +}; + +static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, + struct inet6_fill_args *args) +{ + struct nlmsghdr *nlh; + u32 preferred, valid; + + nlh = nlmsg_put(skb, args->portid, args->seq, args->event, + sizeof(struct ifaddrmsg), args->flags); + if (!nlh) + return -EMSGSIZE; + + put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), + ifa->idev->dev->ifindex); + + if (args->netnsid >= 0 && + nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) + goto error; + + spin_lock_bh(&ifa->lock); + 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; + } + spin_unlock_bh(&ifa->lock); + + 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 (ifa->rt_priority && + nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) + 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; + + if (ifa->ifa_proto && + nla_put_u8(skb, IFA_PROTO, ifa->ifa_proto)) + 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, + struct inet6_fill_args *args) +{ + 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, args->portid, args->seq, args->event, + sizeof(struct ifaddrmsg), args->flags); + if (!nlh) + return -EMSGSIZE; + + if (args->netnsid >= 0 && + nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { + nlmsg_cancel(skb, 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, + struct inet6_fill_args *args) +{ + struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); + int ifindex = dev ? dev->ifindex : 1; + struct nlmsghdr *nlh; + u8 scope = RT_SCOPE_UNIVERSE; + + if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) + scope = RT_SCOPE_SITE; + + nlh = nlmsg_put(skb, args->portid, args->seq, args->event, + sizeof(struct ifaddrmsg), args->flags); + if (!nlh) + return -EMSGSIZE; + + if (args->netnsid >= 0 && + nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { + nlmsg_cancel(skb, 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; +} + +/* called with rcu_read_lock() */ +static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, + struct netlink_callback *cb, int s_ip_idx, + struct inet6_fill_args *fillargs) +{ + struct ifmcaddr6 *ifmca; + struct ifacaddr6 *ifaca; + int ip_idx = 0; + int err = 1; + + read_lock_bh(&idev->lock); + switch (fillargs->type) { + case UNICAST_ADDR: { + struct inet6_ifaddr *ifa; + fillargs->event = RTM_NEWADDR; + + /* unicast address incl. temp addr */ + list_for_each_entry(ifa, &idev->addr_list, if_list) { + if (ip_idx < s_ip_idx) + goto next; + err = inet6_fill_ifaddr(skb, ifa, fillargs); + if (err < 0) + break; + nl_dump_check_consistent(cb, nlmsg_hdr(skb)); +next: + ip_idx++; + } + break; + } + case MULTICAST_ADDR: + read_unlock_bh(&idev->lock); + fillargs->event = RTM_GETMULTICAST; + + /* multicast address */ + for (ifmca = rtnl_dereference(idev->mc_list); + ifmca; + ifmca = rtnl_dereference(ifmca->next), ip_idx++) { + if (ip_idx < s_ip_idx) + continue; + err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); + if (err < 0) + break; + } + read_lock_bh(&idev->lock); + break; + case ANYCAST_ADDR: + fillargs->event = RTM_GETANYCAST; + /* 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, fillargs); + if (err < 0) + break; + } + break; + default: + break; + } + read_unlock_bh(&idev->lock); + cb->args[2] = ip_idx; + return err; +} + +static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, + struct inet6_fill_args *fillargs, + struct net **tgt_net, struct sock *sk, + struct netlink_callback *cb) +{ + struct netlink_ext_ack *extack = cb->extack; + struct nlattr *tb[IFA_MAX+1]; + struct ifaddrmsg *ifm; + int err, i; + + if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { + NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); + return -EINVAL; + } + + ifm = nlmsg_data(nlh); + if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { + NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); + return -EINVAL; + } + + fillargs->ifindex = ifm->ifa_index; + if (fillargs->ifindex) { + cb->answer_flags |= NLM_F_DUMP_FILTERED; + fillargs->flags |= NLM_F_DUMP_FILTERED; + } + + err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, + ifa_ipv6_policy, extack); + if (err < 0) + return err; + + for (i = 0; i <= IFA_MAX; ++i) { + if (!tb[i]) + continue; + + if (i == IFA_TARGET_NETNSID) { + struct net *net; + + fillargs->netnsid = nla_get_s32(tb[i]); + net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); + if (IS_ERR(net)) { + fillargs->netnsid = -1; + NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); + return PTR_ERR(net); + } + *tgt_net = net; + } else { + NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); + return -EINVAL; + } + } + + return 0; +} + +static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, + enum addr_type_t type) +{ + const struct nlmsghdr *nlh = cb->nlh; + struct inet6_fill_args fillargs = { + .portid = NETLINK_CB(cb->skb).portid, + .seq = cb->nlh->nlmsg_seq, + .flags = NLM_F_MULTI, + .netnsid = -1, + .type = type, + }; + struct net *tgt_net = sock_net(skb->sk); + int idx, s_idx, s_ip_idx; + int h, s_h; + struct net_device *dev; + struct inet6_dev *idev; + struct hlist_head *head; + int err = 0; + + s_h = cb->args[0]; + s_idx = idx = cb->args[1]; + s_ip_idx = cb->args[2]; + + if (cb->strict_check) { + err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, + skb->sk, cb); + if (err < 0) + goto put_tgt_net; + + err = 0; + if (fillargs.ifindex) { + dev = __dev_get_by_index(tgt_net, fillargs.ifindex); + if (!dev) { + err = -ENODEV; + goto put_tgt_net; + } + idev = __in6_dev_get(dev); + if (idev) { + err = in6_dump_addrs(idev, skb, cb, s_ip_idx, + &fillargs); + if (err > 0) + err = 0; + } + goto put_tgt_net; + } + } + + rcu_read_lock(); + cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; + for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { + idx = 0; + head = &tgt_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; + idev = __in6_dev_get(dev); + if (!idev) + goto cont; + + if (in6_dump_addrs(idev, skb, cb, s_ip_idx, + &fillargs) < 0) + goto done; +cont: + idx++; + } + } +done: + rcu_read_unlock(); + cb->args[0] = h; + cb->args[1] = idx; +put_tgt_net: + if (fillargs.netnsid >= 0) + put_net(tgt_net); + + return skb->len ? : err; +} + +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_valid_getaddr_req(struct sk_buff *skb, + const struct nlmsghdr *nlh, + struct nlattr **tb, + struct netlink_ext_ack *extack) +{ + struct ifaddrmsg *ifm; + int i, err; + + if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { + NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); + return -EINVAL; + } + + if (!netlink_strict_get_check(skb)) + return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, + ifa_ipv6_policy, extack); + + ifm = nlmsg_data(nlh); + if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { + NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); + return -EINVAL; + } + + err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, + ifa_ipv6_policy, extack); + if (err) + return err; + + for (i = 0; i <= IFA_MAX; i++) { + if (!tb[i]) + continue; + + switch (i) { + case IFA_TARGET_NETNSID: + case IFA_ADDRESS: + case IFA_LOCAL: + break; + default: + NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); + return -EINVAL; + } + } + + return 0; +} + +static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, + struct netlink_ext_ack *extack) +{ + struct net *tgt_net = sock_net(in_skb->sk); + struct inet6_fill_args fillargs = { + .portid = NETLINK_CB(in_skb).portid, + .seq = nlh->nlmsg_seq, + .event = RTM_NEWADDR, + .flags = 0, + .netnsid = -1, + }; + 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 = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); + if (err < 0) + return err; + + if (tb[IFA_TARGET_NETNSID]) { + fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); + + tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, + fillargs.netnsid); + if (IS_ERR(tgt_net)) + return PTR_ERR(tgt_net); + } + + addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); + if (!addr) + return -EINVAL; + + ifm = nlmsg_data(nlh); + if (ifm->ifa_index) + dev = dev_get_by_index(tgt_net, ifm->ifa_index); + + ifa = ipv6_get_ifaddr(tgt_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, &fillargs); + if (err < 0) { + /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ + WARN_ON(err == -EMSGSIZE); + kfree_skb(skb); + goto errout_ifa; + } + err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); +errout_ifa: + in6_ifa_put(ifa); +errout: + dev_put(dev); + if (fillargs.netnsid >= 0) + put_net(tgt_net); + + 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); + struct inet6_fill_args fillargs = { + .portid = 0, + .seq = 0, + .event = event, + .flags = 0, + .netnsid = -1, + }; + int err = -ENOBUFS; + + skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); + if (!skb) + goto errout; + + err = inet6_fill_ifaddr(skb, ifa, &fillargs); + 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_MAX_INTERVAL] = + jiffies_to_msecs(cnf->rtr_solicit_max_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_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric; + array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; + 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_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; + 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] = atomic_read(&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; + array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; + /* we omit DEVCONF_STABLE_SECRET for now */ + array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; + array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; + array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; + array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; + array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; +#ifdef CONFIG_IPV6_SEG6_HMAC + array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; +#endif + array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; + array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; + array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; + array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; + array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled; + array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled; + array[DEVCONF_IOAM6_ID] = cnf->ioam6_id; + array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide; + array[DEVCONF_NDISC_EVICT_NOCARRIER] = cnf->ndisc_evict_nocarrier; + array[DEVCONF_ACCEPT_UNTRACKED_NA] = cnf->accept_untracked_na; + array[DEVCONF_ACCEPT_RA_MIN_LFT] = cnf->accept_ra_min_lft; +} + +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 */ + + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ + + nla_total_size(4) /* IFLA_INET6_RA_MTU */ + + 0; +} + +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(1) /* IFLA_OPERSTATE */ + + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ +} + +static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, + int bytes) +{ + int i; + int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; + BUG_ON(pad < 0); + + /* Use put_unaligned() because stats may not be aligned for u64. */ + put_unaligned(ICMP6_MIB_MAX, &stats[0]); + for (i = 1; i < ICMP6_MIB_MAX; i++) + put_unaligned(atomic_long_read(&mib[i]), &stats[i]); + + memset(&stats[ICMP6_MIB_MAX], 0, pad); +} + +static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, + int bytes, size_t syncpoff) +{ + int i, c; + u64 buff[IPSTATS_MIB_MAX]; + int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; + + BUG_ON(pad < 0); + + memset(buff, 0, sizeof(buff)); + buff[0] = IPSTATS_MIB_MAX; + + for_each_possible_cpu(c) { + for (i = 1; i < IPSTATS_MIB_MAX; i++) + buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); + } + + memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); + memset(&stats[IPSTATS_MIB_MAX], 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, bytes, + offsetof(struct ipstats_mib, syncp)); + break; + case IFLA_INET6_ICMP6STATS: + __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); + break; + } +} + +static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, + u32 ext_filter_mask) +{ + 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 */ + + if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) + return 0; + + 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; + read_lock_bh(&idev->lock); + memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); + read_unlock_bh(&idev->lock); + + if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) + goto nla_put_failure; + + if (idev->ra_mtu && + nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu)) + goto nla_put_failure; + + return 0; + +nla_put_failure: + return -EMSGSIZE; +} + +static size_t inet6_get_link_af_size(const struct net_device *dev, + u32 ext_filter_mask) +{ + 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, + u32 ext_filter_mask) +{ + struct inet6_dev *idev = __in6_dev_get(dev); + + if (!idev) + return -ENODATA; + + if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) + return -EMSGSIZE; + + return 0; +} + +static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token, + struct netlink_ext_ack *extack) +{ + struct inet6_ifaddr *ifp; + struct net_device *dev = idev->dev; + bool clear_token, update_rs = false; + struct in6_addr ll_addr; + + ASSERT_RTNL(); + + if (!token) + return -EINVAL; + + if (dev->flags & IFF_LOOPBACK) { + NL_SET_ERR_MSG_MOD(extack, "Device is loopback"); + return -EINVAL; + } + + if (dev->flags & IFF_NOARP) { + NL_SET_ERR_MSG_MOD(extack, + "Device does not do neighbour discovery"); + return -EINVAL; + } + + if (!ipv6_accept_ra(idev)) { + NL_SET_ERR_MSG_MOD(extack, + "Router advertisement is disabled on device"); + return -EINVAL; + } + + if (idev->cnf.rtr_solicits == 0) { + NL_SET_ERR_MSG(extack, + "Router solicitation is disabled on device"); + 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); + + clear_token = ipv6_addr_any(token); + if (clear_token) + goto update_lft; + + 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; + } + +update_lft: + write_lock_bh(&idev->lock); + + if (update_rs) { + idev->if_flags |= IF_RS_SENT; + idev->rs_interval = rfc3315_s14_backoff_init( + idev->cnf.rtr_solicit_interval); + idev->rs_probes = 1; + addrconf_mod_rs_timer(idev, idev->rs_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(dev_net(dev)); + 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) }, + [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT, + .reject_message = + "IFLA_INET6_RA_MTU can not be set" }, +}; + +static int check_addr_gen_mode(int mode) +{ + if (mode != IN6_ADDR_GEN_MODE_EUI64 && + mode != IN6_ADDR_GEN_MODE_NONE && + mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && + mode != IN6_ADDR_GEN_MODE_RANDOM) + return -EINVAL; + return 1; +} + +static int check_stable_privacy(struct inet6_dev *idev, struct net *net, + int mode) +{ + if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && + !idev->cnf.stable_secret.initialized && + !net->ipv6.devconf_dflt->stable_secret.initialized) + return -EINVAL; + return 1; +} + +static int inet6_validate_link_af(const struct net_device *dev, + const struct nlattr *nla, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb[IFLA_INET6_MAX + 1]; + struct inet6_dev *idev = NULL; + int err; + + if (dev) { + idev = __in6_dev_get(dev); + if (!idev) + return -EAFNOSUPPORT; + } + + err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, + inet6_af_policy, extack); + if (err) + return err; + + if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) + return -EINVAL; + + if (tb[IFLA_INET6_ADDR_GEN_MODE]) { + u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); + + if (check_addr_gen_mode(mode) < 0) + return -EINVAL; + if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) + return -EINVAL; + } + + return 0; +} + +static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla, + struct netlink_ext_ack *extack) +{ + struct inet6_dev *idev = __in6_dev_get(dev); + struct nlattr *tb[IFLA_INET6_MAX + 1]; + int err; + + if (!idev) + return -EAFNOSUPPORT; + + if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) + return -EINVAL; + + if (tb[IFLA_INET6_TOKEN]) { + err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]), + extack); + if (err) + return err; + } + + if (tb[IFLA_INET6_ADDR_GEN_MODE]) { + u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); + + idev->cnf.addr_gen_mode = mode; + } + + return 0; +} + +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))) || + nla_put_u8(skb, IFLA_OPERSTATE, + netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) + goto nla_put_failure; + protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); + if (!protoinfo) + goto nla_put_failure; + + if (inet6_fill_ifla6_attrs(skb, idev, 0) < 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_valid_dump_ifinfo(const struct nlmsghdr *nlh, + struct netlink_ext_ack *extack) +{ + struct ifinfomsg *ifm; + + if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { + NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); + return -EINVAL; + } + + if (nlmsg_attrlen(nlh, sizeof(*ifm))) { + NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); + return -EINVAL; + } + + ifm = nlmsg_data(nlh); + if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || + ifm->ifi_change || ifm->ifi_index) { + NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); + return -EINVAL; + } + + return 0; +} + +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; + + /* only requests using strict checking can pass data to + * influence the dump + */ + if (cb->strict_check) { + int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); + + if (err < 0) + return err; + } + + 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 = pinfo->flags; + + 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 the device was taken down in the middle of the DAD + * cycle there is a race where we could get here without a + * host route, so nothing to insert. That will be fixed when + * the device is brought up. + */ + if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { + ip6_ins_rt(net, ifp->rt); + } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { + pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", + &ifp->addr, ifp->idev->dev->name); + } + + if (ifp->idev->cnf.forwarding) + addrconf_join_anycast(ifp); + if (!ipv6_addr_any(&ifp->peer_addr)) + addrconf_prefix_route(&ifp->peer_addr, 128, + ifp->rt_priority, ifp->idev->dev, + 0, 0, GFP_ATOMIC); + 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 fib6_info *rt; + + rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, + ifp->idev->dev, 0, 0, + false); + if (rt) + ip6_del_rt(net, rt, false); + } + if (ifp->rt) { + ip6_del_rt(net, ifp->rt, false); + ifp->rt = NULL; + } + rt_genid_bump_ipv6(net); + break; + } + atomic_inc(&net->ipv6.dev_addr_genid); +} + +static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) +{ + if (likely(ifp->idev->dead == 0)) + __ipv6_ifa_notify(event, ifp); +} + +#ifdef CONFIG_SYSCTL + +static int addrconf_sysctl_forward(struct ctl_table *ctl, int write, + void *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 *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; + + for_each_netdev(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); + } + } +} + +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 *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 *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, RTM_NEWNETCONF, + NETCONFA_PROXY_NEIGH, + NETCONFA_IFINDEX_DEFAULT, + net->ipv6.devconf_dflt); + else if (valp == &net->ipv6.devconf_all->proxy_ndp) + inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, + NETCONFA_PROXY_NEIGH, + NETCONFA_IFINDEX_ALL, + net->ipv6.devconf_all); + else { + struct inet6_dev *idev = ctl->extra1; + + inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, + NETCONFA_PROXY_NEIGH, + idev->dev->ifindex, + &idev->cnf); + } + rtnl_unlock(); + } + + return ret; +} + +static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, + void *buffer, size_t *lenp, + loff_t *ppos) +{ + int ret = 0; + u32 new_val; + struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; + struct net *net = (struct net *)ctl->extra2; + struct ctl_table tmp = { + .data = &new_val, + .maxlen = sizeof(new_val), + .mode = ctl->mode, + }; + + if (!rtnl_trylock()) + return restart_syscall(); + + new_val = *((u32 *)ctl->data); + + ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); + if (ret != 0) + goto out; + + if (write) { + if (check_addr_gen_mode(new_val) < 0) { + ret = -EINVAL; + goto out; + } + + if (idev) { + if (check_stable_privacy(idev, net, new_val) < 0) { + ret = -EINVAL; + goto out; + } + + if (idev->cnf.addr_gen_mode != new_val) { + idev->cnf.addr_gen_mode = new_val; + addrconf_init_auto_addrs(idev->dev); + } + } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { + struct net_device *dev; + + net->ipv6.devconf_dflt->addr_gen_mode = new_val; + for_each_netdev(net, dev) { + idev = __in6_dev_get(dev); + if (idev && + idev->cnf.addr_gen_mode != new_val) { + idev->cnf.addr_gen_mode = new_val; + addrconf_init_auto_addrs(idev->dev); + } + } + } + + *((u32 *)ctl->data) = new_val; + } + +out: + rtnl_unlock(); + + return ret; +} + +static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, + void *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; + } + + 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->cnf.addr_gen_mode = + IN6_ADDR_GEN_MODE_STABLE_PRIVACY; + } + } + } else { + struct inet6_dev *idev = ctl->extra1; + + idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; + } + +out: + rtnl_unlock(); + + return err; +} + +static +int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, + int write, void *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.ignore_routes_when_linkdown + * 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_linkdown(ctl, valp, val); + if (ret) + *ppos = pos; + return ret; +} + +static +void addrconf_set_nopolicy(struct rt6_info *rt, int action) +{ + if (rt) { + if (action) + rt->dst.flags |= DST_NOPOLICY; + else + rt->dst.flags &= ~DST_NOPOLICY; + } +} + +static +void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) +{ + struct inet6_ifaddr *ifa; + + read_lock_bh(&idev->lock); + list_for_each_entry(ifa, &idev->addr_list, if_list) { + spin_lock(&ifa->lock); + if (ifa->rt) { + /* host routes only use builtin fib6_nh */ + struct fib6_nh *nh = ifa->rt->fib6_nh; + int cpu; + + rcu_read_lock(); + ifa->rt->dst_nopolicy = val ? true : false; + if (nh->rt6i_pcpu) { + for_each_possible_cpu(cpu) { + struct rt6_info **rtp; + + rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); + addrconf_set_nopolicy(*rtp, val); + } + } + rcu_read_unlock(); + } + spin_unlock(&ifa->lock); + } + read_unlock_bh(&idev->lock); +} + +static +int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) +{ + struct inet6_dev *idev; + struct net *net; + + if (!rtnl_trylock()) + return restart_syscall(); + + *valp = val; + + net = (struct net *)ctl->extra2; + if (valp == &net->ipv6.devconf_dflt->disable_policy) { + rtnl_unlock(); + return 0; + } + + if (valp == &net->ipv6.devconf_all->disable_policy) { + struct net_device *dev; + + for_each_netdev(net, dev) { + idev = __in6_dev_get(dev); + if (idev) + addrconf_disable_policy_idev(idev, val); + } + } else { + idev = (struct inet6_dev *)ctl->extra1; + addrconf_disable_policy_idev(idev, val); + } + + rtnl_unlock(); + return 0; +} + +static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, + void *buffer, size_t *lenp, loff_t *ppos) +{ + int *valp = ctl->data; + int val = *valp; + loff_t pos = *ppos; + struct ctl_table lctl; + int ret; + + lctl = *ctl; + lctl.data = &val; + ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); + + if (write && (*valp != val)) + ret = addrconf_disable_policy(ctl, valp, val); + + if (ret) + *ppos = pos; + + return ret; +} + +static int minus_one = -1; +static const int two_five_five = 255; +static u32 ioam6_if_id_max = U16_MAX; + +static const struct ctl_table addrconf_sysctl[] = { + { + .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_minmax, + .extra1 = (void *)SYSCTL_ONE, + .extra2 = (void *)&two_five_five, + }, + { + .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_minmax, + .extra1 = &minus_one, + }, + { + .procname = "router_solicitation_interval", + .data = &ipv6_devconf.rtr_solicit_interval, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_jiffies, + }, + { + .procname = "router_solicitation_max_interval", + .data = &ipv6_devconf.rtr_solicit_max_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 = "ra_defrtr_metric", + .data = &ipv6_devconf.ra_defrtr_metric, + .maxlen = sizeof(u32), + .mode = 0644, + .proc_handler = proc_douintvec_minmax, + .extra1 = (void *)SYSCTL_ONE, + }, + { + .procname = "accept_ra_min_hop_limit", + .data = &ipv6_devconf.accept_ra_min_hop_limit, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, + { + .procname = "accept_ra_min_lft", + .data = &ipv6_devconf.accept_ra_min_lft, + .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_min_plen", + .data = &ipv6_devconf.accept_ra_rt_info_min_plen, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, + { + .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, + }, + { + .procname = "use_oif_addrs_only", + .data = &ipv6_devconf.use_oif_addrs_only, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, + { + .procname = "ignore_routes_with_linkdown", + .data = &ipv6_devconf.ignore_routes_with_linkdown, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, + }, + { + .procname = "drop_unicast_in_l2_multicast", + .data = &ipv6_devconf.drop_unicast_in_l2_multicast, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, + { + .procname = "drop_unsolicited_na", + .data = &ipv6_devconf.drop_unsolicited_na, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, + { + .procname = "keep_addr_on_down", + .data = &ipv6_devconf.keep_addr_on_down, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + + }, + { + .procname = "seg6_enabled", + .data = &ipv6_devconf.seg6_enabled, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, +#ifdef CONFIG_IPV6_SEG6_HMAC + { + .procname = "seg6_require_hmac", + .data = &ipv6_devconf.seg6_require_hmac, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, +#endif + { + .procname = "enhanced_dad", + .data = &ipv6_devconf.enhanced_dad, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, + { + .procname = "addr_gen_mode", + .data = &ipv6_devconf.addr_gen_mode, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = addrconf_sysctl_addr_gen_mode, + }, + { + .procname = "disable_policy", + .data = &ipv6_devconf.disable_policy, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = addrconf_sysctl_disable_policy, + }, + { + .procname = "ndisc_tclass", + .data = &ipv6_devconf.ndisc_tclass, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = (void *)SYSCTL_ZERO, + .extra2 = (void *)&two_five_five, + }, + { + .procname = "rpl_seg_enabled", + .data = &ipv6_devconf.rpl_seg_enabled, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, + { + .procname = "ioam6_enabled", + .data = &ipv6_devconf.ioam6_enabled, + .maxlen = sizeof(u8), + .mode = 0644, + .proc_handler = proc_dou8vec_minmax, + .extra1 = (void *)SYSCTL_ZERO, + .extra2 = (void *)SYSCTL_ONE, + }, + { + .procname = "ioam6_id", + .data = &ipv6_devconf.ioam6_id, + .maxlen = sizeof(u32), + .mode = 0644, + .proc_handler = proc_douintvec_minmax, + .extra1 = (void *)SYSCTL_ZERO, + .extra2 = (void *)&ioam6_if_id_max, + }, + { + .procname = "ioam6_id_wide", + .data = &ipv6_devconf.ioam6_id_wide, + .maxlen = sizeof(u32), + .mode = 0644, + .proc_handler = proc_douintvec, + }, + { + .procname = "ndisc_evict_nocarrier", + .data = &ipv6_devconf.ndisc_evict_nocarrier, + .maxlen = sizeof(u8), + .mode = 0644, + .proc_handler = proc_dou8vec_minmax, + .extra1 = (void *)SYSCTL_ZERO, + .extra2 = (void *)SYSCTL_ONE, + }, + { + .procname = "accept_untracked_na", + .data = &ipv6_devconf.accept_untracked_na, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = SYSCTL_ZERO, + .extra2 = SYSCTL_TWO, + }, + { + /* sentinel */ + } +}; + +static int __addrconf_sysctl_register(struct net *net, char *dev_name, + struct inet6_dev *idev, struct ipv6_devconf *p) +{ + int i, ifindex; + struct ctl_table *table; + char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; + + table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT); + if (!table) + goto out; + + for (i = 0; table[i].data; i++) { + table[i].data += (char *)p - (char *)&ipv6_devconf; + /* If one of these is already set, then it is not safe to + * overwrite either of them: this makes proc_dointvec_minmax + * usable. + */ + if (!table[i].extra1 && !table[i].extra2) { + table[i].extra1 = idev; /* embedded; no ref */ + table[i].extra2 = net; + } + } + + snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); + + p->sysctl_header = register_net_sysctl(net, path, table); + if (!p->sysctl_header) + goto free; + + if (!strcmp(dev_name, "all")) + ifindex = NETCONFA_IFINDEX_ALL; + else if (!strcmp(dev_name, "default")) + ifindex = NETCONFA_IFINDEX_DEFAULT; + else + ifindex = idev->dev->ifindex; + inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, + ifindex, p); + return 0; + +free: + kfree(table); +out: + return -ENOBUFS; +} + +static void __addrconf_sysctl_unregister(struct net *net, + struct ipv6_devconf *p, int ifindex) +{ + struct ctl_table *table; + + if (!p->sysctl_header) + return; + + table = p->sysctl_header->ctl_table_arg; + unregister_net_sysctl_table(p->sysctl_header); + p->sysctl_header = NULL; + kfree(table); + + inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); +} + +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(dev_net(idev->dev), &idev->cnf, + idev->dev->ifindex); + 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; + + spin_lock_init(&net->ipv6.addrconf_hash_lock); + INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work); + net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE, + sizeof(struct hlist_head), + GFP_KERNEL); + if (!net->ipv6.inet6_addr_lst) + goto err_alloc_addr; + + 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; + + if (!net_eq(net, &init_net)) { + switch (net_inherit_devconf()) { + case 1: /* copy from init_net */ + memcpy(all, init_net.ipv6.devconf_all, + sizeof(ipv6_devconf)); + memcpy(dflt, init_net.ipv6.devconf_dflt, + sizeof(ipv6_devconf_dflt)); + break; + case 3: /* copy from the current netns */ + memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, + sizeof(ipv6_devconf)); + memcpy(dflt, + current->nsproxy->net_ns->ipv6.devconf_dflt, + sizeof(ipv6_devconf_dflt)); + break; + case 0: + case 2: + /* use compiled values */ + break; + } + } + + /* 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(net, all, NETCONFA_IFINDEX_ALL); +err_reg_all: + kfree(dflt); + net->ipv6.devconf_dflt = NULL; +#endif +err_alloc_dflt: + kfree(all); + net->ipv6.devconf_all = NULL; +err_alloc_all: + kfree(net->ipv6.inet6_addr_lst); +err_alloc_addr: + return err; +} + +static void __net_exit addrconf_exit_net(struct net *net) +{ + int i; + +#ifdef CONFIG_SYSCTL + __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, + NETCONFA_IFINDEX_DEFAULT); + __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, + NETCONFA_IFINDEX_ALL); +#endif + kfree(net->ipv6.devconf_dflt); + net->ipv6.devconf_dflt = NULL; + kfree(net->ipv6.devconf_all); + net->ipv6.devconf_all = NULL; + + cancel_delayed_work_sync(&net->ipv6.addr_chk_work); + /* + * Check hash table, then free it. + */ + for (i = 0; i < IN6_ADDR_HSIZE; i++) + WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i])); + + kfree(net->ipv6.inet6_addr_lst); + net->ipv6.inet6_addr_lst = NULL; +} + +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 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; + } + + rtnl_lock(); + idev = ipv6_add_dev(blackhole_netdev); + rtnl_unlock(); + if (IS_ERR(idev)) { + err = PTR_ERR(idev); + goto errlo; + } + + ip6_route_init_special_entries(); + + register_netdevice_notifier(&ipv6_dev_notf); + + addrconf_verify(&init_net); + + rtnl_af_register(&inet6_ops); + + err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, + NULL, inet6_dump_ifinfo, 0); + if (err < 0) + goto errout; + + err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, + inet6_rtm_newaddr, NULL, 0); + if (err < 0) + goto errout; + err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, + inet6_rtm_deladdr, NULL, 0); + if (err < 0) + goto errout; + err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, + inet6_rtm_getaddr, inet6_dump_ifaddr, + RTNL_FLAG_DOIT_UNLOCKED); + if (err < 0) + goto errout; + err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, + NULL, inet6_dump_ifmcaddr, 0); + if (err < 0) + goto errout; + err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, + NULL, inet6_dump_ifacaddr, 0); + if (err < 0) + goto errout; + err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, + inet6_netconf_get_devconf, + inet6_netconf_dump_devconf, + RTNL_FLAG_DOIT_UNLOCKED); + if (err < 0) + goto errout; + err = ipv6_addr_label_rtnl_register(); + if (err < 0) + goto errout; + + return 0; +errout: + rtnl_unregister_all(PF_INET6); + 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; + + unregister_netdevice_notifier(&ipv6_dev_notf); + unregister_pernet_subsys(&addrconf_ops); + ipv6_addr_label_cleanup(); + + rtnl_af_unregister(&inet6_ops); + + rtnl_lock(); + + /* clean dev list */ + for_each_netdev(&init_net, dev) { + if (__in6_dev_get(dev) == NULL) + continue; + addrconf_ifdown(dev, true); + } + addrconf_ifdown(init_net.loopback_dev, true); + + rtnl_unlock(); + + destroy_workqueue(addrconf_wq); +} |