| // 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> |
| |
| #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() % 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() % 200001) * (u64)rt; |
| do_div(tmp, 1000000); |
| if ((s32)tmp > mrt) { |
| /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ |
| tmp = (900000 + prandom_u32() % 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_regen_rndid(struct inet6_dev *idev); |
| static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); |
| |
| 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) |
| /* |
| * Configured unicast address hash table |
| */ |
| static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; |
| static DEFINE_SPINLOCK(addrconf_hash_lock); |
| |
| static void addrconf_verify(void); |
| static void addrconf_verify_rtnl(void); |
| static void addrconf_verify_work(struct work_struct *); |
| |
| static struct workqueue_struct *addrconf_wq; |
| static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); |
| |
| static void addrconf_join_anycast(struct inet6_ifaddr *ifp); |
| static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); |
| |
| static void addrconf_type_change(struct net_device *dev, |
| unsigned long event); |
| static int addrconf_ifdown(struct net_device *dev, int how); |
| |
| static struct 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, |
| .accept_ra_from_local = 0, |
| .accept_ra_min_hop_limit= 1, |
| .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 |
| .accept_ra_rt_table = 0, |
| .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, |
| }; |
| |
| 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, |
| .accept_ra_from_local = 0, |
| .accept_ra_min_hop_limit= 1, |
| .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 |
| .accept_ra_rt_table = 0, |
| .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, |
| }; |
| |
| /* 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 (!timer_pending(&idev->rs_timer)) |
| in6_dev_hold(idev); |
| mod_timer(&idev->rs_timer, jiffies + when); |
| } |
| |
| static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, |
| unsigned long delay) |
| { |
| 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(struct ipstats_mib); |
| if (!idev->stats.ipv6) |
| goto err_ip; |
| |
| for_each_possible_cpu(i) { |
| struct ipstats_mib *addrconf_stats; |
| addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); |
| u64_stats_init(&addrconf_stats->syncp); |
| } |
| |
| |
| idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), |
| GFP_KERNEL); |
| if (!idev->stats.icmpv6dev) |
| goto err_icmp; |
| idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), |
| GFP_KERNEL); |
| if (!idev->stats.icmpv6msgdev) |
| goto err_icmpmsg; |
| |
| return 0; |
| |
| err_icmpmsg: |
| kfree(idev->stats.icmpv6dev); |
| err_icmp: |
| free_percpu(idev->stats.ipv6); |
| err_ip: |
| return -ENOMEM; |
| } |
| |
| static struct inet6_dev *ipv6_add_dev(struct net_device *dev) |
| { |
| struct inet6_dev *ndev; |
| int err = -ENOMEM; |
| |
| ASSERT_RTNL(); |
| |
| if (dev->mtu < IPV6_MIN_MTU) |
| return ERR_PTR(-EINVAL); |
| |
| ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); |
| if (!ndev) |
| return ERR_PTR(err); |
| |
| rwlock_init(&ndev->lock); |
| ndev->dev = dev; |
| INIT_LIST_HEAD(&ndev->addr_list); |
| 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->nd_parms = neigh_parms_alloc(dev, &nd_tbl); |
| if (!ndev->nd_parms) { |
| kfree(ndev); |
| return ERR_PTR(err); |
| } |
| if (ndev->cnf.forwarding) |
| dev_disable_lro(dev); |
| /* We refer to the device */ |
| dev_hold(dev); |
| |
| if (snmp6_alloc_dev(ndev) < 0) { |
| netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", |
| __func__); |
| neigh_parms_release(&nd_tbl, ndev->nd_parms); |
| dev_put(dev); |
| kfree(ndev); |
| return ERR_PTR(err); |
| } |
| |
| 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; |
| } else |
| ipv6_regen_rndid(ndev); |
| |
| 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; |
| 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); |
| |
| /* 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); |
| if (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, &inet6_addr_lst[hash], addr_lst) { |
| if (!net_eq(dev_net(ifp->idev->dev), net)) |
| continue; |
| if (ipv6_addr_equal(&ifp->addr, addr)) { |
| if (!dev || ifp->idev->dev == dev) |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) |
| { |
| unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr); |
| int err = 0; |
| |
| spin_lock(&addrconf_hash_lock); |
| |
| /* Ignore adding duplicate addresses on an interface */ |
| if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) { |
| netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); |
| err = -EEXIST; |
| } else { |
| hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); |
| } |
| |
| spin_unlock(&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); |
| 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; |
| /* 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_bh(); |
| |
| err = ipv6_add_addr_hash(idev->dev, ifa); |
| if (err < 0) { |
| rcu_read_unlock_bh(); |
| goto out; |
| } |
| |
| write_lock(&idev->lock); |
| |
| /* Add to inet6_dev unicast addr list. */ |
| ipv6_link_dev_addr(idev, ifa); |
| |
| if (ifa->flags&IFA_F_TEMPORARY) { |
| list_add(&ifa->tmp_list, &idev->tempaddr_list); |
| in6_ifa_hold(ifa); |
| } |
| |
| in6_ifa_hold(ifa); |
| write_unlock(&idev->lock); |
| |
| rcu_read_unlock_bh(); |
| |
| 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); |
| 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) |
| { |
| int state; |
| enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; |
| unsigned long expires; |
| |
| ASSERT_RTNL(); |
| |
| spin_lock_bh(&ifp->lock); |
| state = ifp->state; |
| ifp->state = INET6_IFADDR_STATE_DEAD; |
| spin_unlock_bh(&ifp->lock); |
| |
| if (state == INET6_IFADDR_STATE_DEAD) |
| goto out; |
| |
| spin_lock_bh(&addrconf_hash_lock); |
| hlist_del_init_rcu(&ifp->addr_lst); |
| spin_unlock_bh(&addrconf_hash_lock); |
| |
| write_lock_bh(&ifp->idev->lock); |
| |
| if (ifp->flags&IFA_F_TEMPORARY) { |
| list_del(&ifp->tmp_list); |
| if (ifp->ifpub) { |
| in6_ifa_put(ifp->ifpub); |
| ifp->ifpub = NULL; |
| } |
| __in6_ifa_put(ifp); |
| } |
| |
| if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) |
| action = check_cleanup_prefix_route(ifp, &expires); |
| |
| list_del_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, |
| struct inet6_ifaddr *ift, |
| bool block) |
| { |
| struct inet6_dev *idev = ifp->idev; |
| struct in6_addr addr, *tmpaddr; |
| unsigned long tmp_tstamp, age; |
| unsigned long regen_advance; |
| struct ifa6_config cfg; |
| int ret = 0; |
| unsigned long now = jiffies; |
| long max_desync_factor; |
| s32 cnf_temp_preferred_lft; |
| |
| write_lock_bh(&idev->lock); |
| if (ift) { |
| spin_lock_bh(&ift->lock); |
| memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); |
| spin_unlock_bh(&ift->lock); |
| tmpaddr = &addr; |
| } else { |
| tmpaddr = NULL; |
| } |
| retry: |
| in6_dev_hold(idev); |
| if (idev->cnf.use_tempaddr <= 0) { |
| write_unlock_bh(&idev->lock); |
| pr_info("%s: use_tempaddr is disabled\n", __func__); |
| in6_dev_put(idev); |
| ret = -1; |
| goto out; |
| } |
| spin_lock_bh(&ifp->lock); |
| if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { |
| idev->cnf.use_tempaddr = -1; /*XXX*/ |
| spin_unlock_bh(&ifp->lock); |
| write_unlock_bh(&idev->lock); |
| pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", |
| __func__); |
| in6_dev_put(idev); |
| ret = -1; |
| goto out; |
| } |
| in6_ifa_hold(ifp); |
| memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); |
| ipv6_try_regen_rndid(idev, tmpaddr); |
| memcpy(&addr.s6_addr[8], idev->rndid, 8); |
| age = (now - ifp->tstamp) / HZ; |
| |
| regen_advance = idev->cnf.regen_max_retry * |
| idev->cnf.dad_transmits * |
| NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / 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(__u32, |
| 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__); |
| tmpaddr = &addr; |
| write_lock_bh(&idev->lock); |
| goto retry; |
| } |
| |
| spin_lock_bh(&ift->lock); |
| ift->ifpub = ifp; |
| ift->cstamp = now; |
| ift->tstamp = tmp_tstamp; |
| spin_unlock_bh(&ift->lock); |
| |
| addrconf_dad_start(ift); |
| in6_ifa_put(ift); |
| in6_dev_put(idev); |
| out: |
| return ret; |
| } |
| |
| /* |
| * Choose an appropriate source address (RFC3484) |
| */ |
| enum { |
| IPV6_SADDR_RULE_INIT = 0, |
| IPV6_SADDR_RULE_LOCAL, |
| IPV6_SADDR_RULE_SCOPE, |
| IPV6_SADDR_RULE_PREFERRED, |
| #ifdef CONFIG_IPV6_MIP6 |
| IPV6_SADDR_RULE_HOA, |
| #endif |
| IPV6_SADDR_RULE_OIF, |
| IPV6_SADDR_RULE_LABEL, |
| IPV6_SADDR_RULE_PRIVACY, |
| IPV6_SADDR_RULE_ORCHID, |
| IPV6_SADDR_RULE_PREFIX, |
| #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
| IPV6_SADDR_RULE_NOT_OPTIMISTIC, |
| #endif |
| IPV6_SADDR_RULE_MAX |
| }; |
| |
| struct ipv6_saddr_score { |
| int rule; |
| int addr_type; |
| struct inet6_ifaddr *ifa; |
| DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); |
| int scopedist; |
| int matchlen; |
| }; |
| |
| struct ipv6_saddr_dst { |
| const struct in6_addr *addr; |
| int ifindex; |
| int scope; |
| int label; |
| unsigned int prefs; |
| }; |
| |
| static inline int ipv6_saddr_preferred(int type) |
| { |
| if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) |
| return 1; |
| return 0; |
| } |
| |
| static 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); |
| |
| 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) |
| */ |
| 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) |
| { |
| unsigned int hash = inet6_addr_hash(net, addr); |
| const struct net_device *l3mdev; |
| 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, &inet6_addr_lst[hash], addr_lst) { |
| if (!net_eq(dev_net(ifp->idev->dev), net)) |
| continue; |
| |
| if (l3mdev_master_dev_rcu(ifp->idev->dev) != 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 || ifp->idev->dev == dev || |
| !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { |
| rcu_read_unlock(); |
| return 1; |
| } |
| } |
| |
| rcu_read_unlock(); |
| return 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); |
| |
| 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, &inet6_addr_lst[hash], addr_lst) { |
| if (!net_eq(dev_net(ifp->idev->dev), net)) |
| continue; |
| if (ipv6_addr_equal(&ifp->addr, addr)) { |
| if (!dev || ifp->idev->dev == dev || |
| !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { |
| result = ifp; |
| in6_ifa_hold(ifp); |
| break; |
| } |
| } |
| } |
| rcu_read_unlock(); |
| |
| 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, ifp, 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(ifp->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) |
| { |
| union fwnet_hwaddr *ha; |
| |
| if (dev->addr_len != FWNET_ALEN) |
| return -1; |
| |
| ha = (union fwnet_hwaddr *)dev->dev_addr; |
| |
| memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); |
| eui[0] ^= 2; |
| return 0; |
| } |
| |
| static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) |
| { |
| /* XXX: inherit EUI-64 from other interface -- yoshfuji */ |
| if (dev->addr_len != ARCNET_ALEN) |
| return -1; |
| memset(eui, 0, 7); |
| eui[7] = *(u8 *)dev->dev_addr; |
| return 0; |
| } |
| |
| static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) |
| { |
| if (dev->addr_len != INFINIBAND_ALEN) |
| return -1; |
| memcpy(eui, dev->dev_addr + 12, 8); |
| eui[0] |= 2; |
| return 0; |
| } |
| |
| static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) |
| { |
| if (addr == 0) |
| return -1; |
| eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || |
| ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || |
| ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || |
| ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || |
| ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || |
| ipv4_is_lbcast(addr)) ? 0x00 : 0x02; |
| eui[1] = 0; |
| eui[2] = 0x5E; |
| eui[3] = 0xFE; |
| memcpy(eui + 4, &addr, 4); |
| return 0; |
| } |
| |
| static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) |
| { |
| if (dev->priv_flags & IFF_ISATAP) |
| return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); |
| return -1; |
| } |
| |
| static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) |
| { |
| return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); |
| } |
| |
| static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) |
| { |
| memcpy(eui, dev->perm_addr, 3); |
| memcpy(eui + 5, dev->perm_addr + 3, 3); |
| eui[3] = 0xFF; |
| eui[4] = 0xFE; |
| eui[0] ^= 2; |
| return 0; |
| } |
| |
| static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) |
| { |
| switch (dev->type) { |
| case ARPHRD_ETHER: |
| case ARPHRD_FDDI: |
| return addrconf_ifid_eui48(eui, dev); |
| case ARPHRD_ARCNET: |
| return addrconf_ifid_arcnet(eui, dev); |
| case ARPHRD_INFINIBAND: |
| return addrconf_ifid_infiniband(eui, dev); |
| case ARPHRD_SIT: |
| return addrconf_ifid_sit(eui, dev); |
| case ARPHRD_IPGRE: |
| 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; |
| } |
| |
| /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ |
| static void ipv6_regen_rndid(struct inet6_dev *idev) |
| { |
| regen: |
| get_random_bytes(idev->rndid, sizeof(idev->rndid)); |
| idev->rndid[0] &= ~0x02; |
| |
| /* |
| * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: |
| * check if generated address is not inappropriate |
| * |
| * - Reserved subnet anycast (RFC 2526) |
| * 11111101 11....11 1xxxxxxx |
| * - ISATAP (RFC4214) 6.1 |
| * 00-00-5E-FE-xx-xx-xx-xx |
| * - value 0 |
| * - XXX: already assigned to an address on the device |
| */ |
| if (idev->rndid[0] == 0xfd && |
| (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && |
| (idev->rndid[7]&0x80)) |
| goto regen; |
| if ((idev->rndid[0]|idev->rndid[1]) == 0) { |
| if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) |
| goto regen; |
| if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) |
| goto regen; |
| } |
| } |
| |
| static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) |
| { |
| if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) |
| ipv6_regen_rndid(idev); |
| } |
| |
| u32 addrconf_rt_table(const struct net_device *dev, u32 default_table) |
| { |
| struct inet6_dev *idev = in6_dev_get(dev); |
| int sysctl; |
| u32 table; |
| |
| if (!idev) |
| return default_table; |
| sysctl = idev->cnf.accept_ra_rt_table; |
| if (sysctl == 0) { |
| table = default_table; |
| } else if (sysctl > 0) { |
| table = (u32) sysctl; |
| } else { |
| table = (unsigned) dev->ifindex + (-sysctl); |
| } |
| in6_dev_put(idev); |
| return table; |
| } |
| |
| /* |
| * 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) ? : addrconf_rt_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) ? : addrconf_rt_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); |
| } |
| |
| if ((create || list_empty(&idev->tempaddr_list)) && |
| idev->cnf.use_tempaddr > 0) { |
| /* When a new public address is created as described |
| * in [ADDRCONF], also create a new temporary address. |
| * Also create a temporary address if it's enabled but |
| * no temporary address currently exists. |
| */ |
| read_unlock_bh(&idev->lock); |
| ipv6_create_tempaddr(ifp, NULL, 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, |
| }; |
| |
| #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(); |
| } |
| |
| 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; |
| } |
| |
| /* |
| * 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); |
| 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); |
| } |
| |
| /* |
| * Set destination address. |
| * Special case for SIT interfaces where we create a new "virtual" |
| * device. |
| */ |
| int addrconf_set_dstaddr(struct net *net, void __user *arg) |
| { |
| struct in6_ifreq ireq; |
| struct net_device *dev; |
| int err = -EINVAL; |
| |
| rtnl_lock(); |
| |
| err = -EFAULT; |
| if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) |
| goto err_exit; |
| |
| dev = __dev_get_by_index(net, ireq.ifr6_ifindex); |
| |
| err = -ENODEV; |
| if (!dev) |
| goto err_exit; |
| |
| #if IS_ENABLED(CONFIG_IPV6_SIT) |
| if (dev->type == ARPHRD_SIT) { |
| const struct net_device_ops *ops = dev->netdev_ops; |
| struct ifreq ifr; |
| struct ip_tunnel_parm p; |
| |
| err = -EADDRNOTAVAIL; |
| if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) |
| goto err_exit; |
| |
| memset(&p, 0, sizeof(p)); |
| p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; |
| p.iph.saddr = 0; |
| p.iph.version = 4; |
| p.iph.ihl = 5; |
| p.iph.protocol = IPPROTO_IPV6; |
| p.iph.ttl = 64; |
| ifr.ifr_ifru.ifru_data = (__force void __user *)&p; |
| |
| if (ops->ndo_do_ioctl) { |
| mm_segment_t oldfs = get_fs(); |
| |
| set_fs(KERNEL_DS); |
| err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); |
| set_fs(oldfs); |
| } else |
| err = -EOPNOTSUPP; |
| |
| if (err == 0) { |
| err = -ENOBUFS; |
| dev = __dev_get_by_name(net, p.name); |
| if (!dev) |
| goto err_exit; |
| err = dev_open(dev, NULL); |
| } |
| } |
| #endif |
| |
| err_exit: |
| rtnl_unlock(); |
| return err; |
| } |
| |
| static int ipv6_mc_config(struct sock *sk, bool join, |
| const struct in6_addr *addr, int ifindex) |
| { |
| int ret; |
| |
| ASSERT_RTNL(); |
| |
| lock_sock(sk); |
| if (join) |
| ret = ipv6_sock_mc_join(sk, ifindex, addr); |
| else |
| ret = ipv6_sock_mc_drop(sk, ifindex, addr); |
| release_sock(sk); |
| |
| return ret; |
| } |
| |
| /* |
| * Manual configuration of address on an interface |
| */ |
| static int inet6_addr_add(struct net *net, int ifindex, |
| 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(); |
| 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(); |
| 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 = |