| /* |
| * IPv6 Address [auto]configuration |
| * Linux INET6 implementation |
| * |
| * Authors: |
| * Pedro Roque <roque@di.fc.ul.pt> |
| * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| /* |
| * Changes: |
| * |
| * Janos Farkas : delete timer on ifdown |
| * <chexum@bankinf.banki.hu> |
| * Andi Kleen : kill double kfree on module |
| * unload. |
| * Maciej W. Rozycki : FDDI support |
| * sekiya@USAGI : Don't send too many RS |
| * packets. |
| * yoshfuji@USAGI : Fixed interval between DAD |
| * packets. |
| * YOSHIFUJI Hideaki @USAGI : improved accuracy of |
| * address validation timer. |
| * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) |
| * support. |
| * Yuji SEKIYA @USAGI : Don't assign a same IPv6 |
| * address on a same interface. |
| * YOSHIFUJI Hideaki @USAGI : ARCnet support |
| * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to |
| * seq_file. |
| * YOSHIFUJI Hideaki @USAGI : improved source address |
| * selection; consider scope, |
| * status etc. |
| */ |
| |
| #define pr_fmt(fmt) "IPv6: " fmt |
| |
| #include <linux/errno.h> |
| #include <linux/types.h> |
| #include <linux/kernel.h> |
| #include <linux/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> |
| |
| /* Set to 3 to get tracing... */ |
| #define ACONF_DEBUG 2 |
| |
| #if ACONF_DEBUG >= 3 |
| #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__) |
| #else |
| #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0) |
| #endif |
| |
| #define INFINITY_LIFE_TIME 0xFFFFFFFF |
| |
| #define IPV6_MAX_STRLEN \ |
| sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") |
| |
| static inline u32 cstamp_delta(unsigned long cstamp) |
| { |
| return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; |
| } |
| |
| 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(struct inet6_dev *idev); |
| static int ipv6_generate_stable_address(struct in6_addr *addr, |
| u8 dad_count, |
| const struct inet6_dev *idev); |
| |
| /* |
| * Configured unicast address hash table |
| */ |
| static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; |
| static DEFINE_SPINLOCK(addrconf_hash_lock); |
| |
| static void addrconf_verify(void); |
| static void addrconf_verify_rtnl(void); |
| static void addrconf_verify_work(struct work_struct *); |
| |
| static struct workqueue_struct *addrconf_wq; |
| static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); |
| |
| static void addrconf_join_anycast(struct inet6_ifaddr *ifp); |
| static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); |
| |
| static void addrconf_type_change(struct net_device *dev, |
| unsigned long event); |
| static int addrconf_ifdown(struct net_device *dev, int how); |
| |
| static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, |
| int plen, |
| const struct net_device *dev, |
| u32 flags, u32 noflags); |
| |
| static void addrconf_dad_start(struct inet6_ifaddr *ifp); |
| static void addrconf_dad_work(struct work_struct *w); |
| static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id); |
| static void addrconf_dad_run(struct inet6_dev *idev); |
| static void addrconf_rs_timer(unsigned long data); |
| static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); |
| static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); |
| |
| static void inet6_prefix_notify(int event, struct inet6_dev *idev, |
| struct prefix_info *pinfo); |
| static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, |
| struct net_device *dev); |
| |
| static struct ipv6_devconf ipv6_devconf __read_mostly = { |
| .forwarding = 0, |
| .hop_limit = IPV6_DEFAULT_HOPLIMIT, |
| .mtu6 = IPV6_MIN_MTU, |
| .accept_ra = 1, |
| .accept_redirects = 1, |
| .autoconf = 1, |
| .force_mld_version = 0, |
| .mldv1_unsolicited_report_interval = 10 * HZ, |
| .mldv2_unsolicited_report_interval = HZ, |
| .dad_transmits = 1, |
| .rtr_solicits = MAX_RTR_SOLICITATIONS, |
| .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, |
| .rtr_solicit_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 |
| .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, |
| }; |
| |
| 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 |
| .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 a valid qdisc is available */ |
| static inline bool addrconf_qdisc_ok(const struct net_device *dev) |
| { |
| return !qdisc_tx_is_noop(dev); |
| } |
| |
| static void addrconf_del_rs_timer(struct inet6_dev *idev) |
| { |
| if (del_timer(&idev->rs_timer)) |
| __in6_dev_put(idev); |
| } |
| |
| static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) |
| { |
| if (cancel_delayed_work(&ifp->dad_work)) |
| __in6_ifa_put(ifp); |
| } |
| |
| static void addrconf_mod_rs_timer(struct inet6_dev *idev, |
| unsigned long when) |
| { |
| if (!timer_pending(&idev->rs_timer)) |
| in6_dev_hold(idev); |
| mod_timer(&idev->rs_timer, jiffies + when); |
| } |
| |
| static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, |
| unsigned long delay) |
| { |
| if (!delayed_work_pending(&ifp->dad_work)) |
| in6_ifa_hold(ifp); |
| mod_delayed_work(addrconf_wq, &ifp->dad_work, delay); |
| } |
| |
| static int snmp6_alloc_dev(struct inet6_dev *idev) |
| { |
| int i; |
| |
| idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); |
| if (!idev->stats.ipv6) |
| goto err_ip; |
| |
| for_each_possible_cpu(i) { |
| struct ipstats_mib *addrconf_stats; |
| addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); |
| u64_stats_init(&addrconf_stats->syncp); |
| } |
| |
| |
| idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), |
| GFP_KERNEL); |
| if (!idev->stats.icmpv6dev) |
| goto err_icmp; |
| idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), |
| GFP_KERNEL); |
| if (!idev->stats.icmpv6msgdev) |
| goto err_icmpmsg; |
| |
| return 0; |
| |
| err_icmpmsg: |
| kfree(idev->stats.icmpv6dev); |
| err_icmp: |
| free_percpu(idev->stats.ipv6); |
| err_ip: |
| return -ENOMEM; |
| } |
| |
| static struct inet6_dev *ipv6_add_dev(struct net_device *dev) |
| { |
| struct inet6_dev *ndev; |
| int err = -ENOMEM; |
| |
| ASSERT_RTNL(); |
| |
| if (dev->mtu < IPV6_MIN_MTU) |
| return ERR_PTR(-EINVAL); |
| |
| ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); |
| if (!ndev) |
| return ERR_PTR(err); |
| |
| rwlock_init(&ndev->lock); |
| ndev->dev = dev; |
| INIT_LIST_HEAD(&ndev->addr_list); |
| setup_timer(&ndev->rs_timer, addrconf_rs_timer, |
| (unsigned long)ndev); |
| memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); |
| |
| if (ndev->cnf.stable_secret.initialized) |
| ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; |
| else |
| ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode; |
| |
| 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) { |
| ADBG(KERN_WARNING |
| "%s: cannot allocate memory for statistics; dev=%s.\n", |
| __func__, dev->name); |
| neigh_parms_release(&nd_tbl, ndev->nd_parms); |
| dev_put(dev); |
| kfree(ndev); |
| return ERR_PTR(err); |
| } |
| |
| if (snmp6_register_dev(ndev) < 0) { |
| ADBG(KERN_WARNING |
| "%s: cannot create /proc/net/dev_snmp6/%s\n", |
| __func__, dev->name); |
| goto err_release; |
| } |
| |
| /* One reference from device. */ |
| in6_dev_hold(ndev); |
| |
| if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) |
| ndev->cnf.accept_dad = -1; |
| |
| #if IS_ENABLED(CONFIG_IPV6_SIT) |
| if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { |
| pr_info("%s: Disabled Multicast RS\n", dev->name); |
| ndev->cnf.rtr_solicits = 0; |
| } |
| #endif |
| |
| INIT_LIST_HEAD(&ndev->tempaddr_list); |
| 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_qdisc_ok(dev)) |
| ndev->if_flags |= IF_READY; |
| |
| ipv6_mc_init_dev(ndev); |
| ndev->tstamp = jiffies; |
| err = addrconf_sysctl_register(ndev); |
| if (err) { |
| ipv6_mc_destroy_dev(ndev); |
| 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 NULL; |
| } |
| |
| if (dev->flags&IFF_UP) |
| ipv6_mc_up(idev); |
| return idev; |
| } |
| |
| static int inet6_netconf_msgsize_devconf(int type) |
| { |
| int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) |
| + nla_total_size(4); /* NETCONFA_IFINDEX */ |
| 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, |
| 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_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 netconfmsg *ncm; |
| struct sk_buff *skb; |
| struct ipv6_devconf *devconf; |
| struct inet6_dev *in6_dev; |
| struct net_device *dev; |
| int ifindex; |
| int err; |
| |
| err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, |
| devconf_ipv6_policy, extack); |
| if (err < 0) |
| goto errout; |
| |
| err = -EINVAL; |
| if (!tb[NETCONFA_IFINDEX]) |
| goto errout; |
| |
| ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); |
| switch (ifindex) { |
| case NETCONFA_IFINDEX_ALL: |
| devconf = net->ipv6.devconf_all; |
| break; |
| case NETCONFA_IFINDEX_DEFAULT: |
| devconf = net->ipv6.devconf_dflt; |
| break; |
| default: |
| dev = __dev_get_by_index(net, ifindex); |
| if (!dev) |
| goto errout; |
| in6_dev = __in6_dev_get(dev); |
| if (!in6_dev) |
| goto errout; |
| devconf = &in6_dev->cnf; |
| break; |
| } |
| |
| err = -ENOBUFS; |
| skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC); |
| if (!skb) |
| goto errout; |
| |
| err = inet6_netconf_fill_devconf(skb, ifindex, devconf, |
| NETLINK_CB(in_skb).portid, |
| nlh->nlmsg_seq, RTM_NEWNETCONF, 0, |
| 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: |
| return err; |
| } |
| |
| static int inet6_netconf_dump_devconf(struct sk_buff *skb, |
| struct netlink_callback *cb) |
| { |
| struct net *net = sock_net(skb->sk); |
| int h, s_h; |
| int idx, s_idx; |
| struct net_device *dev; |
| struct inet6_dev *idev; |
| struct hlist_head *head; |
| |
| s_h = cb->args[0]; |
| s_idx = idx = cb->args[1]; |
| |
| for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { |
| idx = 0; |
| head = &net->dev_index_head[h]; |
| rcu_read_lock(); |
| cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ |
| net->dev_base_seq; |
| hlist_for_each_entry_rcu(dev, head, index_hlist) { |
| if (idx < s_idx) |
| goto cont; |
| idev = __in6_dev_get(dev); |
| if (!idev) |
| goto cont; |
| |
| if (inet6_netconf_fill_devconf(skb, dev->ifindex, |
| &idev->cnf, |
| NETLINK_CB(cb->skb).portid, |
| cb->nlh->nlmsg_seq, |
| RTM_NEWNETCONF, |
| NLM_F_MULTI, |
| 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, |
| cb->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, |
| cb->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; |
| |
| if (!idev) |
| return; |
| dev = idev->dev; |
| if (idev->cnf.forwarding) |
| dev_disable_lro(dev); |
| if (dev->flags & IFF_MULTICAST) { |
| if (idev->cnf.forwarding) { |
| ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); |
| ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); |
| ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); |
| } else { |
| ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); |
| ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); |
| ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); |
| } |
| } |
| |
| list_for_each_entry(ifa, &idev->addr_list, if_list) { |
| if (ifa->flags&IFA_F_TENTATIVE) |
| continue; |
| if (idev->cnf.forwarding) |
| addrconf_join_anycast(ifa); |
| else |
| addrconf_leave_anycast(ifa); |
| } |
| inet6_netconf_notify_devconf(dev_net(dev), 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; |
| } |
| ip6_rt_put(ifp->rt); |
| |
| kfree_rcu(ifp, rcu); |
| } |
| |
| static void |
| ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) |
| { |
| struct list_head *p; |
| int ifp_scope = ipv6_addr_src_scope(&ifp->addr); |
| |
| /* |
| * Each device address list is sorted in order of scope - |
| * global before linklocal. |
| */ |
| list_for_each(p, &idev->addr_list) { |
| struct inet6_ifaddr *ifa |
| = list_entry(p, struct inet6_ifaddr, if_list); |
| if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) |
| break; |
| } |
| |
| list_add_tail(&ifp->if_list, p); |
| } |
| |
| static u32 inet6_addr_hash(const struct in6_addr *addr) |
| { |
| return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); |
| } |
| |
| /* On success it returns ifp with increased reference count */ |
| |
| static struct inet6_ifaddr * |
| ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, |
| const struct in6_addr *peer_addr, int pfxlen, |
| int scope, u32 flags, u32 valid_lft, u32 prefered_lft) |
| { |
| struct net *net = dev_net(idev->dev); |
| struct inet6_ifaddr *ifa = NULL; |
| struct rt6_info *rt; |
| unsigned int hash; |
| int err = 0; |
| int addr_type = ipv6_addr_type(addr); |
| |
| if (addr_type == IPV6_ADDR_ANY || |
| addr_type & IPV6_ADDR_MULTICAST || |
| (!(idev->dev->flags & IFF_LOOPBACK) && |
| addr_type & IPV6_ADDR_LOOPBACK)) |
| return ERR_PTR(-EADDRNOTAVAIL); |
| |
| rcu_read_lock_bh(); |
| if (idev->dead) { |
| err = -ENODEV; /*XXX*/ |
| goto out2; |
| } |
| |
| if (idev->cnf.disable_ipv6) { |
| err = -EACCES; |
| goto out2; |
| } |
| |
| spin_lock(&addrconf_hash_lock); |
| |
| /* Ignore adding duplicate addresses on an interface */ |
| if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { |
| ADBG("ipv6_add_addr: already assigned\n"); |
| err = -EEXIST; |
| goto out; |
| } |
| |
| ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); |
| |
| if (!ifa) { |
| ADBG("ipv6_add_addr: malloc failed\n"); |
| err = -ENOBUFS; |
| goto out; |
| } |
| |
| rt = addrconf_dst_alloc(idev, addr, false); |
| if (IS_ERR(rt)) { |
| err = PTR_ERR(rt); |
| goto out; |
| } |
| |
| if (net->ipv6.devconf_all->disable_policy || |
| idev->cnf.disable_policy) |
| rt->dst.flags |= DST_NOPOLICY; |
| |
| neigh_parms_data_state_setall(idev->nd_parms); |
| |
| ifa->addr = *addr; |
| if (peer_addr) |
| ifa->peer_addr = *peer_addr; |
| |
| spin_lock_init(&ifa->lock); |
| INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); |
| INIT_HLIST_NODE(&ifa->addr_lst); |
| ifa->scope = scope; |
| ifa->prefix_len = pfxlen; |
| ifa->flags = flags | IFA_F_TENTATIVE; |
| ifa->valid_lft = valid_lft; |
| ifa->prefered_lft = prefered_lft; |
| ifa->cstamp = ifa->tstamp = jiffies; |
| ifa->tokenized = false; |
| |
| ifa->rt = rt; |
| |
| ifa->idev = idev; |
| in6_dev_hold(idev); |
| /* For caller */ |
| in6_ifa_hold(ifa); |
| |
| /* Add to big hash table */ |
| hash = inet6_addr_hash(addr); |
| |
| hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); |
| spin_unlock(&addrconf_hash_lock); |
| |
| write_lock(&idev->lock); |
| /* Add to inet6_dev unicast addr list. */ |
| ipv6_link_dev_addr(idev, ifa); |
| |
| if (ifa->flags&IFA_F_TEMPORARY) { |
| list_add(&ifa->tmp_list, &idev->tempaddr_list); |
| in6_ifa_hold(ifa); |
| } |
| |
| in6_ifa_hold(ifa); |
| write_unlock(&idev->lock); |
| out2: |
| rcu_read_unlock_bh(); |
| |
| if (likely(err == 0)) |
| inet6addr_notifier_call_chain(NETDEV_UP, ifa); |
| else { |
| kfree(ifa); |
| ifa = ERR_PTR(err); |
| } |
| |
| return ifa; |
| out: |
| spin_unlock(&addrconf_hash_lock); |
| goto out2; |
| } |
| |
| enum cleanup_prefix_rt_t { |
| CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ |
| CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ |
| CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ |
| }; |
| |
| /* |
| * Check, whether the prefix for ifp would still need a prefix route |
| * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* |
| * constants. |
| * |
| * 1) we don't purge prefix if address was not permanent. |
| * prefix is managed by its own lifetime. |
| * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. |
| * 3) if there are no addresses, delete prefix. |
| * 4) if there are still other permanent address(es), |
| * corresponding prefix is still permanent. |
| * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, |
| * don't purge the prefix, assume user space is managing it. |
| * 6) otherwise, update prefix lifetime to the |
| * longest valid lifetime among the corresponding |
| * addresses on the device. |
| * Note: subsequent RA will update lifetime. |
| **/ |
| static enum cleanup_prefix_rt_t |
| check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) |
| { |
| struct inet6_ifaddr *ifa; |
| struct inet6_dev *idev = ifp->idev; |
| unsigned long lifetime; |
| enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; |
| |
| *expires = jiffies; |
| |
| list_for_each_entry(ifa, &idev->addr_list, if_list) { |
| if (ifa == ifp) |
| continue; |
| if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, |
| ifp->prefix_len)) |
| continue; |
| if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) |
| return CLEANUP_PREFIX_RT_NOP; |
| |
| action = CLEANUP_PREFIX_RT_EXPIRE; |
| |
| spin_lock(&ifa->lock); |
| |
| lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); |
| /* |
| * Note: Because this address is |
| * not permanent, lifetime < |
| * LONG_MAX / HZ here. |
| */ |
| if (time_before(*expires, ifa->tstamp + lifetime * HZ)) |
| *expires = ifa->tstamp + lifetime * HZ; |
| spin_unlock(&ifa->lock); |
| } |
| |
| return action; |
| } |
| |
| static void |
| cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) |
| { |
| struct rt6_info *rt; |
| |
| rt = addrconf_get_prefix_route(&ifp->addr, |
| ifp->prefix_len, |
| ifp->idev->dev, |
| 0, RTF_GATEWAY | RTF_DEFAULT); |
| if (rt) { |
| if (del_rt) |
| ip6_del_rt(rt); |
| else { |
| if (!(rt->rt6i_flags & RTF_EXPIRES)) |
| rt6_set_expires(rt, expires); |
| ip6_rt_put(rt); |
| } |
| } |
| } |
| |
| |
| /* This function wants to get referenced ifp and releases it before return */ |
| |
| static void ipv6_del_addr(struct inet6_ifaddr *ifp) |
| { |
| int state; |
| enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; |
| unsigned long expires; |
| |
| ASSERT_RTNL(); |
| |
| spin_lock_bh(&ifp->lock); |
| state = ifp->state; |
| ifp->state = INET6_IFADDR_STATE_DEAD; |
| spin_unlock_bh(&ifp->lock); |
| |
| if (state == INET6_IFADDR_STATE_DEAD) |
| goto out; |
| |
| spin_lock_bh(&addrconf_hash_lock); |
| hlist_del_init_rcu(&ifp->addr_lst); |
| spin_unlock_bh(&addrconf_hash_lock); |
| |
| write_lock_bh(&ifp->idev->lock); |
| |
| if (ifp->flags&IFA_F_TEMPORARY) { |
| list_del(&ifp->tmp_list); |
| if (ifp->ifpub) { |
| in6_ifa_put(ifp->ifpub); |
| ifp->ifpub = NULL; |
| } |
| __in6_ifa_put(ifp); |
| } |
| |
| if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) |
| action = check_cleanup_prefix_route(ifp, &expires); |
| |
| list_del_init(&ifp->if_list); |
| __in6_ifa_put(ifp); |
| |
| write_unlock_bh(&ifp->idev->lock); |
| |
| addrconf_del_dad_work(ifp); |
| |
| ipv6_ifa_notify(RTM_DELADDR, ifp); |
| |
| inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); |
| |
| if (action != CLEANUP_PREFIX_RT_NOP) { |
| cleanup_prefix_route(ifp, expires, |
| action == CLEANUP_PREFIX_RT_DEL); |
| } |
| |
| /* clean up prefsrc entries */ |
| rt6_remove_prefsrc(ifp); |
| out: |
| in6_ifa_put(ifp); |
| } |
| |
| static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) |
| { |
| struct inet6_dev *idev = ifp->idev; |
| struct in6_addr addr, *tmpaddr; |
| unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; |
| unsigned long regen_advance; |
| int tmp_plen; |
| int ret = 0; |
| u32 addr_flags; |
| unsigned long now = jiffies; |
| 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; |
| } |
| } |
| |
| tmp_valid_lft = min_t(__u32, |
| ifp->valid_lft, |
| idev->cnf.temp_valid_lft + age); |
| tmp_prefered_lft = cnf_temp_preferred_lft + age - |
| idev->desync_factor; |
| tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft); |
| tmp_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 (tmp_prefered_lft <= regen_advance + age) { |
| in6_ifa_put(ifp); |
| in6_dev_put(idev); |
| ret = -1; |
| goto out; |
| } |
| |
| addr_flags = IFA_F_TEMPORARY; |
| /* set in addrconf_prefix_rcv() */ |
| if (ifp->flags & IFA_F_OPTIMISTIC) |
| addr_flags |= IFA_F_OPTIMISTIC; |
| |
| ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, |
| ipv6_addr_scope(&addr), addr_flags, |
| tmp_valid_lft, tmp_prefered_lft); |
| if (IS_ERR(ift)) { |
| in6_ifa_put(ifp); |
| in6_dev_put(idev); |
| pr_info("%s: retry temporary address regeneration\n", __func__); |
| tmpaddr = &addr; |
| write_lock_bh(&idev->lock); |
| goto retry; |
| } |
| |
| spin_lock_bh(&ift->lock); |
| ift->ifpub = ifp; |
| ift->cstamp = now; |
| ift->tstamp = tmp_tstamp; |
| spin_unlock_bh(&ift->lock); |
| |
| addrconf_dad_start(ift); |
| in6_ifa_put(ift); |
| in6_dev_put(idev); |
| out: |
| return ret; |
| } |
| |
| /* |
| * Choose an appropriate source address (RFC3484) |
| */ |
| enum { |
| IPV6_SADDR_RULE_INIT = 0, |
| IPV6_SADDR_RULE_LOCAL, |
| IPV6_SADDR_RULE_SCOPE, |
| IPV6_SADDR_RULE_PREFERRED, |
| #ifdef CONFIG_IPV6_MIP6 |
| IPV6_SADDR_RULE_HOA, |
| #endif |
| IPV6_SADDR_RULE_OIF, |
| IPV6_SADDR_RULE_LABEL, |
| IPV6_SADDR_RULE_PRIVACY, |
| IPV6_SADDR_RULE_ORCHID, |
| IPV6_SADDR_RULE_PREFIX, |
| #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
| IPV6_SADDR_RULE_NOT_OPTIMISTIC, |
| #endif |
| IPV6_SADDR_RULE_MAX |
| }; |
| |
| struct ipv6_saddr_score { |
| int rule; |
| int addr_type; |
| struct inet6_ifaddr *ifa; |
| DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); |
| int scopedist; |
| int matchlen; |
| }; |
| |
| struct ipv6_saddr_dst { |
| const struct in6_addr *addr; |
| int ifindex; |
| int scope; |
| int label; |
| unsigned int prefs; |
| }; |
| |
| static inline int ipv6_saddr_preferred(int type) |
| { |
| if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) |
| return 1; |
| return 0; |
| } |
| |
| static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev) |
| { |
| #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
| return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic; |
| #else |
| return false; |
| #endif |
| } |
| |
| static int ipv6_get_saddr_eval(struct net *net, |
| struct ipv6_saddr_score *score, |
| struct ipv6_saddr_dst *dst, |
| int i) |
| { |
| int ret; |
| |
| if (i <= score->rule) { |
| switch (i) { |
| case IPV6_SADDR_RULE_SCOPE: |
| ret = score->scopedist; |
| break; |
| case IPV6_SADDR_RULE_PREFIX: |
| ret = score->matchlen; |
| break; |
| default: |
| ret = !!test_bit(i, score->scorebits); |
| } |
| goto out; |
| } |
| |
| switch (i) { |
| case IPV6_SADDR_RULE_INIT: |
| /* Rule 0: remember if hiscore is not ready yet */ |
| ret = !!score->ifa; |
| break; |
| case IPV6_SADDR_RULE_LOCAL: |
| /* Rule 1: Prefer same address */ |
| ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); |
| break; |
| case IPV6_SADDR_RULE_SCOPE: |
| /* Rule 2: Prefer appropriate scope |
| * |
| * ret |
| * ^ |
| * -1 | d 15 |
| * ---+--+-+---> scope |
| * | |
| * | d is scope of the destination. |
| * B-d | \ |
| * | \ <- smaller scope is better if |
| * B-15 | \ if scope is enough for destination. |
| * | ret = B - scope (-1 <= scope >= d <= 15). |
| * d-C-1 | / |
| * |/ <- greater is better |
| * -C / if scope is not enough for destination. |
| * /| ret = scope - C (-1 <= d < scope <= 15). |
| * |
| * d - C - 1 < B -15 (for all -1 <= d <= 15). |
| * C > d + 14 - B >= 15 + 14 - B = 29 - B. |
| * Assume B = 0 and we get C > 29. |
| */ |
| ret = __ipv6_addr_src_scope(score->addr_type); |
| if (ret >= dst->scope) |
| ret = -ret; |
| else |
| ret -= 128; /* 30 is enough */ |
| score->scopedist = ret; |
| break; |
| case IPV6_SADDR_RULE_PREFERRED: |
| { |
| /* Rule 3: Avoid deprecated and optimistic addresses */ |
| u8 avoid = IFA_F_DEPRECATED; |
| |
| if (!ipv6_use_optimistic_addr(score->ifa->idev)) |
| avoid |= IFA_F_OPTIMISTIC; |
| ret = ipv6_saddr_preferred(score->addr_type) || |
| !(score->ifa->flags & avoid); |
| break; |
| } |
| #ifdef CONFIG_IPV6_MIP6 |
| case IPV6_SADDR_RULE_HOA: |
| { |
| /* Rule 4: Prefer home address */ |
| int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); |
| ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; |
| break; |
| } |
| #endif |
| case IPV6_SADDR_RULE_OIF: |
| /* Rule 5: Prefer outgoing interface */ |
| ret = (!dst->ifindex || |
| dst->ifindex == score->ifa->idev->dev->ifindex); |
| break; |
| case IPV6_SADDR_RULE_LABEL: |
| /* Rule 6: Prefer matching label */ |
| ret = ipv6_addr_label(net, |
| &score->ifa->addr, score->addr_type, |
| score->ifa->idev->dev->ifindex) == dst->label; |
| break; |
| case IPV6_SADDR_RULE_PRIVACY: |
| { |
| /* Rule 7: Prefer public address |
| * Note: prefer temporary address if use_tempaddr >= 2 |
| */ |
| int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? |
| !!(dst->prefs & IPV6_PREFER_SRC_TMP) : |
| score->ifa->idev->cnf.use_tempaddr >= 2; |
| ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; |
| break; |
| } |
| case IPV6_SADDR_RULE_ORCHID: |
| /* Rule 8-: Prefer ORCHID vs ORCHID or |
| * non-ORCHID vs non-ORCHID |
| */ |
| ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ |
| ipv6_addr_orchid(dst->addr)); |
| break; |
| case IPV6_SADDR_RULE_PREFIX: |
| /* Rule 8: Use longest matching prefix */ |
| ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); |
| if (ret > score->ifa->prefix_len) |
| ret = score->ifa->prefix_len; |
| score->matchlen = ret; |
| break; |
| #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
| case IPV6_SADDR_RULE_NOT_OPTIMISTIC: |
| /* Optimistic addresses still have lower precedence than other |
| * preferred addresses. |
| */ |
| ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); |
| break; |
| #endif |
| default: |
| ret = 0; |
| } |
| |
| if (ret) |
| __set_bit(i, score->scorebits); |
| score->rule = i; |
| out: |
| return ret; |
| } |
| |
| 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]; |
| |
| read_lock_bh(&idev->lock); |
| list_for_each_entry(score->ifa, &idev->addr_list, if_list) { |
| int i; |
| |
| /* |
| * - Tentative Address (RFC2462 section 5.4) |
| * - A tentative address is not considered |
| * "assigned to an interface" in the traditional |
| * sense, unless it is also flagged as optimistic. |
| * - Candidate Source Address (section 4) |
| * - In any case, anycast addresses, multicast |
| * addresses, and the unspecified address MUST |
| * NOT be included in a candidate set. |
| */ |
| if ((score->ifa->flags & IFA_F_TENTATIVE) && |
| (!(score->ifa->flags & IFA_F_OPTIMISTIC))) |
| continue; |
| |
| score->addr_type = __ipv6_addr_type(&score->ifa->addr); |
| |
| if (unlikely(score->addr_type == IPV6_ADDR_ANY || |
| score->addr_type & IPV6_ADDR_MULTICAST)) { |
| net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", |
| 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) { |
| if (hiscore->ifa) |
| in6_ifa_put(hiscore->ifa); |
| |
| in6_ifa_hold(score->ifa); |
| |
| swap(hiscore, score); |
| hiscore_idx = 1 - hiscore_idx; |
| |
| /* restore our iterator */ |
| score->ifa = hiscore->ifa; |
| |
| break; |
| } |
| } |
| } |
| out: |
| read_unlock_bh(&idev->lock); |
| 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; |
| |
| 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: |
| rcu_read_unlock(); |
| |
| hiscore = &scores[hiscore_idx]; |
| if (!hiscore->ifa) |
| return -EADDRNOTAVAIL; |
| |
| *saddr = hiscore->ifa->addr; |
| in6_ifa_put(hiscore->ifa); |
| return 0; |
| } |
| EXPORT_SYMBOL(ipv6_dev_get_saddr); |
| |
| int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, |
| u32 banned_flags) |
| { |
| struct inet6_ifaddr *ifp; |
| int err = -EADDRNOTAVAIL; |
| |
| list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { |
| if (ifp->scope > IFA_LINK) |
| break; |
| if (ifp->scope == IFA_LINK && |
| !(ifp->flags & banned_flags)) { |
| *addr = ifp->addr; |
| err = 0; |
| break; |
| } |
| } |
| return err; |
| } |
| |
| int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, |
| u32 banned_flags) |
| { |
| struct inet6_dev *idev; |
| int err = -EADDRNOTAVAIL; |
| |
| rcu_read_lock(); |
| idev = __in6_dev_get(dev); |
| if (idev) { |
| read_lock_bh(&idev->lock); |
| err = __ipv6_get_lladdr(idev, addr, banned_flags); |
| read_unlock_bh(&idev->lock); |
| } |
| rcu_read_unlock(); |
| return err; |
| } |
| |
| static int ipv6_count_addresses(struct inet6_dev *idev) |
| { |
| int cnt = 0; |
| struct inet6_ifaddr *ifp; |
| |
| read_lock_bh(&idev->lock); |
| list_for_each_entry(ifp, &idev->addr_list, if_list) |
| cnt++; |
| read_unlock_bh(&idev->lock); |
| return cnt; |
| } |
| |
| int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, |
| const struct net_device *dev, int strict) |
| { |
| return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE); |
| } |
| EXPORT_SYMBOL(ipv6_chk_addr); |
| |
| int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, |
| const struct net_device *dev, int strict, |
| u32 banned_flags) |
| { |
| struct inet6_ifaddr *ifp; |
| unsigned int hash = inet6_addr_hash(addr); |
| u32 ifp_flags; |
| |
| rcu_read_lock_bh(); |
| hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { |
| if (!net_eq(dev_net(ifp->idev->dev), net)) |
| continue; |
| /* Decouple optimistic from tentative for evaluation here. |
| * Ban optimistic addresses explicitly, when required. |
| */ |
| ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) |
| ? (ifp->flags&~IFA_F_TENTATIVE) |
| : ifp->flags; |
| if (ipv6_addr_equal(&ifp->addr, addr) && |
| !(ifp_flags&banned_flags) && |
| (!dev || ifp->idev->dev == dev || |
| !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { |
| rcu_read_unlock_bh(); |
| return 1; |
| } |
| } |
| |
| rcu_read_unlock_bh(); |
| return 0; |
| } |
| EXPORT_SYMBOL(ipv6_chk_addr_and_flags); |
| |
| static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, |
| struct net_device *dev) |
| { |
| unsigned int hash = inet6_addr_hash(addr); |
| struct inet6_ifaddr *ifp; |
| |
| hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { |
| if (!net_eq(dev_net(ifp->idev->dev), net)) |
| continue; |
| if (ipv6_addr_equal(&ifp->addr, addr)) { |
| if (!dev || ifp->idev->dev == dev) |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /* Compares an address/prefix_len with addresses on device @dev. |
| * If one is found it returns true. |
| */ |
| bool ipv6_chk_custom_prefix(const struct in6_addr *addr, |
| const unsigned int prefix_len, struct net_device *dev) |
| { |
| struct inet6_dev *idev; |
| struct inet6_ifaddr *ifa; |
| bool ret = false; |
| |
| rcu_read_lock(); |
| idev = __in6_dev_get(dev); |
| if (idev) { |
| read_lock_bh(&idev->lock); |
| list_for_each_entry(ifa, &idev->addr_list, if_list) { |
| ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); |
| if (ret) |
| break; |
| } |
| read_unlock_bh(&idev->lock); |
| } |
| rcu_read_unlock(); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(ipv6_chk_custom_prefix); |
| |
| int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) |
| { |
| struct inet6_dev *idev; |
| struct inet6_ifaddr *ifa; |
| int onlink; |
| |
| onlink = 0; |
| rcu_read_lock(); |
| idev = __in6_dev_get(dev); |
| if (idev) { |
| read_lock_bh(&idev->lock); |
| list_for_each_entry(ifa, &idev->addr_list, if_list) { |
| onlink = ipv6_prefix_equal(addr, &ifa->addr, |
| ifa->prefix_len); |
| if (onlink) |
| break; |
| } |
| read_unlock_bh(&idev->lock); |
| } |
| rcu_read_unlock(); |
| return onlink; |
| } |
| EXPORT_SYMBOL(ipv6_chk_prefix); |
| |
| struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, |
| struct net_device *dev, int strict) |
| { |
| struct inet6_ifaddr *ifp, *result = NULL; |
| unsigned int hash = inet6_addr_hash(addr); |
| |
| rcu_read_lock_bh(); |
| hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { |
| if (!net_eq(dev_net(ifp->idev->dev), net)) |
| continue; |
| if (ipv6_addr_equal(&ifp->addr, addr)) { |
| if (!dev || ifp->idev->dev == dev || |
| !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { |
| result = ifp; |
| in6_ifa_hold(ifp); |
| break; |
| } |
| } |
| } |
| rcu_read_unlock_bh(); |
| |
| return result; |
| } |
| |
| /* Gets referenced address, destroys ifaddr */ |
| |
| static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) |
| { |
| if (dad_failed) |
| ifp->flags |= IFA_F_DADFAILED; |
| |
| if (ifp->flags&IFA_F_PERMANENT) { |
| spin_lock_bh(&ifp->lock); |
| addrconf_del_dad_work(ifp); |
| ifp->flags |= IFA_F_TENTATIVE; |
| spin_unlock_bh(&ifp->lock); |
| if (dad_failed) |
| ipv6_ifa_notify(0, ifp); |
| in6_ifa_put(ifp); |
| } else if (ifp->flags&IFA_F_TEMPORARY) { |
| struct inet6_ifaddr *ifpub; |
| spin_lock_bh(&ifp->lock); |
| ifpub = ifp->ifpub; |
| if (ifpub) { |
| in6_ifa_hold(ifpub); |
| spin_unlock_bh(&ifp->lock); |
| ipv6_create_tempaddr(ifpub, ifp); |
| in6_ifa_put(ifpub); |
| } else { |
| spin_unlock_bh(&ifp->lock); |
| } |
| ipv6_del_addr(ifp); |
| } else { |
| ipv6_del_addr(ifp); |
| } |
| } |
| |
| static int addrconf_dad_end(struct inet6_ifaddr *ifp) |
| { |
| int err = -ENOENT; |
| |
| spin_lock_bh(&ifp->lock); |
| if (ifp->state == INET6_IFADDR_STATE_DAD) { |
| ifp->state = INET6_IFADDR_STATE_POSTDAD; |
| err = 0; |
| } |
| spin_unlock_bh(&ifp->lock); |
| |
| return err; |
| } |
| |
| void addrconf_dad_failure(struct inet6_ifaddr *ifp) |
| { |
| struct inet6_dev *idev = ifp->idev; |
| struct net *net = dev_net(ifp->idev->dev); |
| |
| if (addrconf_dad_end(ifp)) { |
| in6_ifa_put(ifp); |
| return; |
| } |
| |
| net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", |
| ifp->idev->dev->name, &ifp->addr); |
| |
| spin_lock_bh(&ifp->lock); |
| |
| if (ifp->flags & IFA_F_STABLE_PRIVACY) { |
| int scope = ifp->scope; |
| u32 flags = ifp->flags; |
| struct in6_addr new_addr; |
| struct inet6_ifaddr *ifp2; |
| u32 valid_lft, preferred_lft; |
| int pfxlen = ifp->prefix_len; |
| int retries = ifp->stable_privacy_retry + 1; |
| |
| if (retries > net->ipv6.sysctl.idgen_retries) { |
| net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", |
| ifp->idev->dev->name); |
| goto errdad; |
| } |
| |
| new_addr = ifp->addr; |
| if (ipv6_generate_stable_address(&new_addr, retries, |
| idev)) |
| goto errdad; |
| |
| valid_lft = ifp->valid_lft; |
| preferred_lft = ifp->prefered_lft; |
| |
| spin_unlock_bh(&ifp->lock); |
| |
| if (idev->cnf.max_addresses && |
| ipv6_count_addresses(idev) >= |
| idev->cnf.max_addresses) |
| goto lock_errdad; |
| |
| net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", |
| ifp->idev->dev->name); |
| |
| ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, |
| scope, flags, valid_lft, |
| preferred_lft); |
| if (IS_ERR(ifp2)) |
| goto lock_errdad; |
| |
| spin_lock_bh(&ifp2->lock); |
| ifp2->stable_privacy_retry = retries; |
| ifp2->state = INET6_IFADDR_STATE_PREDAD; |
| spin_unlock_bh(&ifp2->lock); |
| |
| addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); |
| in6_ifa_put(ifp2); |
| lock_errdad: |
| spin_lock_bh(&ifp->lock); |
| } |
| |
| 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: |
| 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); |
| } |
| |
| /* |
| * Add prefix route. |
| */ |
| |
| static void |
| addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, |
| unsigned long expires, u32 flags) |
| { |
| struct fib6_config cfg = { |
| .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, |
| .fc_metric = IP6_RT_PRIO_ADDRCONF, |
| .fc_ifindex = dev->ifindex, |
| .fc_expires = expires, |
| .fc_dst_len = plen, |
| .fc_flags = RTF_UP | flags, |
| .fc_nlinfo.nl_net = dev_net(dev), |
| .fc_protocol = RTPROT_KERNEL, |
| }; |
| |
| cfg.fc_dst = *pfx; |
| |
| /* Prevent useless cloning on PtP SIT. |
| This thing is done here expecting that the whole |
| class of non-broadcast devices need not cloning. |
| */ |
| #if IS_ENABLED(CONFIG_IPV6_SIT) |
| if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) |
| cfg.fc_flags |= RTF_NONEXTHOP; |
| #endif |
| |
| ip6_route_add(&cfg); |
| } |
| |
| |
| static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, |
| int plen, |
| const struct net_device *dev, |
| u32 flags, u32 noflags) |
| { |
| struct fib6_node *fn; |
| struct rt6_info *rt = NULL; |
| struct fib6_table *table; |
| u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; |
| |
| table = fib6_get_table(dev_net(dev), tb_id); |
| if (!table) |
| return NULL; |
| |
| read_lock_bh(&table->tb6_lock); |
| fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); |
| if (!fn) |
| goto out; |
| |
| noflags |= RTF_CACHE; |
| for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
| if (rt->dst.dev->ifindex != dev->ifindex) |
| continue; |
| if ((rt->rt6i_flags & flags) != flags) |
| continue; |
| if ((rt->rt6i_flags & noflags) != 0) |
| continue; |
| dst_hold(&rt->dst); |
| break; |
| } |
| out: |
| read_unlock_bh(&table->tb6_lock); |
| return rt; |
| } |
| |
| |
| /* Create "default" multicast route to the interface */ |
| |
| static void addrconf_add_mroute(struct net_device *dev) |
| { |
| struct fib6_config cfg = { |
| .fc_table = 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_nlinfo.nl_net = dev_net(dev), |
| }; |
| |
| ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); |
| |
| ip6_route_add(&cfg); |
| } |
| |
| static struct inet6_dev *addrconf_add_dev(struct net_device *dev) |
| { |
| struct inet6_dev *idev; |
| |
| ASSERT_RTNL(); |
| |
| idev = ipv6_find_idev(dev); |
| if (!idev) |
| return ERR_PTR(-ENOBUFS); |
| |
| if (idev->cnf.disable_ipv6) |
| return ERR_PTR(-EACCES); |
| |
| /* Add default multicast route */ |
| if (!(dev->flags & IFF_LOOPBACK) && !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); |
| } 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; |
| |
| #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
| if (in6_dev->cnf.optimistic_dad && |
| !net->ipv6.devconf_all->forwarding && sllao) |
| addr_flags |= IFA_F_OPTIMISTIC; |
| #endif |
| |
| /* Do not allow to create too much of autoconfigured |
| * addresses; this would be too easy way to crash kernel. |
| */ |
| if (!max_addresses || |
| ipv6_count_addresses(in6_dev) < max_addresses) |
| ifp = ipv6_add_addr(in6_dev, addr, NULL, |
| pinfo->prefix_len, |
| addr_type&IPV6_ADDR_SCOPE_MASK, |
| addr_flags, valid_lft, |
| prefered_lft); |
| |
| if (IS_ERR_OR_NULL(ifp)) |
| return -1; |
| |
| update_lft = 0; |
| create = 1; |
| spin_lock_bh(&ifp->lock); |
| ifp->flags |= IFA_F_MANAGETEMPADDR; |
| ifp->cstamp = jiffies; |
| ifp->tokenized = tokenized; |
| spin_unlock_bh(&ifp->lock); |
| addrconf_dad_start(ifp); |
| } |
| |
| if (ifp) { |
| u32 flags; |
| unsigned long now; |
| u32 stored_lft; |
| |
| /* update lifetime (RFC2462 5.5.3 e) */ |
| spin_lock_bh(&ifp->lock); |
| now = jiffies; |
| if (ifp->valid_lft > (now - ifp->tstamp) / HZ) |
| stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; |
| else |
| stored_lft = 0; |
| if (!update_lft && !create && stored_lft) { |
| const u32 minimum_lft = min_t(u32, |
| stored_lft, MIN_VALID_LIFETIME); |
| valid_lft = max(valid_lft, minimum_lft); |
| |
| /* RFC4862 Section 5.5.3e: |
| * "Note that the preferred lifetime of the |
| * corresponding address is always reset to |
| * the Preferred Lifetime in the received |
| * Prefix Information option, regardless of |
| * whether the valid lifetime is also reset or |
| * ignored." |
| * |
| * So we should always update prefered_lft here. |
| */ |
| update_lft = 1; |
| } |
| |
| if (update_lft) { |
| ifp->valid_lft = valid_lft; |
| ifp->prefered_lft = prefered_lft; |
| ifp->tstamp = now; |
| flags = ifp->flags; |
| ifp->flags &= ~IFA_F_DEPRECATED; |
| spin_unlock_bh(&ifp->lock); |
| |
| if (!(flags&IFA_F_TENTATIVE)) |
| ipv6_ifa_notify(0, ifp); |
| } else |
| spin_unlock_bh(&ifp->lock); |
| |
| manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, |
| create, now); |
| |
| in6_ifa_put(ifp); |
| addrconf_verify(); |
| } |
| |
| 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)) { |
| ADBG("addrconf: prefix option too short\n"); |
| return; |
| } |
| |
| /* |
| * Validation checks ([ADDRCONF], page 19) |
| */ |
| |
| addr_type = ipv6_addr_type(&pinfo->prefix); |
| |
| if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) |
| return; |
| |
| valid_lft = ntohl(pinfo->valid); |
| prefered_lft = ntohl(pinfo->prefered); |
| |
| if (prefered_lft > valid_lft) { |
| net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); |
| return; |
| } |
| |
| in6_dev = in6_dev_get(dev); |
| |
| if (!in6_dev) { |
| net_dbg_ratelimited("addrconf: device %s not configured\n", |
| dev->name); |
| return; |
| } |
| |
| /* |
| * Two things going on here: |
| * 1) Add routes for on-link prefixes |
| * 2) Configure prefixes with the auto flag set |
| */ |
| |
| if (pinfo->onlink) { |
| struct rt6_info *rt; |
| unsigned long rt_expires; |
| |
| /* Avoid arithmetic overflow. Really, we could |
| * save rt_expires in seconds, likely valid_lft, |
| * but it would require division in fib gc, that it |
| * not good. |
| */ |
| if (HZ > USER_HZ) |
| rt_expires = addrconf_timeout_fixup(valid_lft, HZ); |
| else |
| rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); |
| |
| if (addrconf_finite_timeout(rt_expires)) |
| rt_expires *= HZ; |
| |
| rt = addrconf_get_prefix_route(&pinfo->prefix, |
| pinfo->prefix_len, |
| dev, |
| RTF_ADDRCONF | RTF_PREFIX_RT, |
| RTF_GATEWAY | RTF_DEFAULT); |
| |
| if (rt) { |
| /* Autoconf prefix route */ |
| if (valid_lft == 0) { |
| ip6_del_rt(rt); |
| rt = NULL; |
| } else if (addrconf_finite_timeout(rt_expires)) { |
| /* not infinity */ |
| rt6_set_expires(rt, jiffies + rt_expires); |
| } else { |
| rt6_clean_expires(rt); |
| } |
| } else if (valid_lft) { |
| clock_t expires = 0; |
| int flags = RTF_ADDRCONF | RTF_PREFIX_RT; |
| if (addrconf_finite_timeout(rt_expires)) { |
| /* not infinity */ |
| flags |= RTF_EXPIRES; |
| expires = jiffies_to_clock_t(rt_expires); |
| } |
| addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, |
| dev, expires, flags); |
| } |
| ip6_rt_put(rt); |
| } |
| |
| /* Try to figure out our local address for this prefix */ |
| |
| if (pinfo->autoconf && in6_dev->cnf.autoconf) { |
| struct 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); |
| } |
| } |
| #endif |
| |
| err_exit: |
| rtnl_unlock(); |
| return err; |
| } |
| |
| static int ipv6_mc_config(struct sock *sk, bool join, |
| const struct in6_addr *addr, int ifindex) |
| { |
| int ret; |
| |
| ASSERT_RTNL(); |
| |
| lock_sock(sk); |
| if (join) |
| ret = ipv6_sock_mc_join(sk, ifindex, addr); |
| else |
| ret = ipv6_sock_mc_drop(sk, ifindex, addr); |
| release_sock(sk); |
| |
| return ret; |
| } |
| |
| /* |
| * Manual configuration of address on an interface |
| */ |
| static int inet6_addr_add(struct net *net, int ifindex, |
| const struct in6_addr *pfx, |
| const struct in6_addr *peer_pfx, |
| unsigned int plen, __u32 ifa_flags, |
| __u32 prefered_lft, __u32 valid_lft) |
| { |
| struct inet6_ifaddr *ifp; |
| struct inet6_dev *idev; |
| struct net_device *dev; |
| unsigned long timeout; |
| clock_t expires; |
| int scope; |
| u32 flags; |
| |
| ASSERT_RTNL(); |
| |
| if (plen > 128) |
| return -EINVAL; |
| |
| /* check the lifetime */ |
| if (!valid_lft || prefered_lft > valid_lft) |
| return -EINVAL; |
| |
| if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) |
| return -EINVAL; |
| |
| dev = __dev_get_by_index(net, ifindex); |
| if (!dev) |
| return -ENODEV; |
| |
| idev = addrconf_add_dev(dev); |
| if (IS_ERR(idev)) |
| return PTR_ERR(idev); |
| |
| if (ifa_flags & IFA_F_MCAUTOJOIN) { |
| int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, |
| true, pfx, ifindex); |
| |
| if (ret < 0) |
| return ret; |
| } |
| |
| scope = ipv6_addr_scope(pfx); |
| |
| timeout = addrconf_timeout_fixup(valid_lft, HZ); |
| if (addrconf_finite_timeout(timeout)) { |
| expires = jiffies_to_clock_t(timeout * HZ); |
| valid_lft = timeout; |
| flags = RTF_EXPIRES; |
| } else { |
| expires = 0; |
| flags = 0; |
| ifa_flags |= IFA_F_PERMANENT; |
| } |
| |
| timeout = addrconf_timeout_fixup(prefered_lft, HZ); |
| if (addrconf_finite_timeout(timeout)) { |
| if (timeout == 0) |
| ifa_flags |= IFA_F_DEPRECATED; |
| prefered_lft = timeout; |
| } |
| |
| ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, |
| valid_lft, prefered_lft); |
| |
| if (!IS_ERR(ifp)) { |
| if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { |
| addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, |
| expires, flags); |
| } |
| |
| /* |
| * Note that section 3.1 of RFC 4429 indicates |
| * that the Optimistic flag should not be set for |
| * manually configured addresses |
| */ |
| addrconf_dad_start(ifp); |
| if (ifa_flags & IFA_F_MANAGETEMPADDR) |
| manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, |
| true, jiffies); |
| in6_ifa_put(ifp); |
| addrconf_verify_rtnl(); |
| return 0; |
| } else if (ifa_flags & IFA_F_MCAUTOJOIN) { |
| ipv6_mc_config(net->ipv6.mc_autojoin_sk, |
| false, pfx, ifindex); |
| } |
| |
| return PTR_ERR(ifp); |
| } |
| |
| static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, |
| const struct in6_addr *pfx, unsigned int plen) |
| { |
| struct inet6_ifaddr *ifp; |
| struct inet6_dev *idev; |
| struct net_device *dev; |
| |
| if (plen > 128) |
| return -EINVAL; |
| |
| dev = __dev_get_by_index(net, ifindex); |
| if (!dev) |
| return -ENODEV; |
| |
| idev = __in6_dev_get(dev); |
| if (!idev) |
| return -ENXIO; |
| |
| read_lock_bh(&idev->lock); |
| list_for_each_entry(ifp, &idev->addr_list, if_list) { |
| if (ifp->prefix_len == plen && |
| ipv6_addr_equal(pfx, &ifp->addr)) { |
| in6_ifa_hold(ifp); |
| read_unlock_bh(&idev->lock); |
| |
| if (!(ifp->flags & IFA_F_TEMPORARY) && |
| (ifa_flags & IFA_F_MANAGETEMPADDR)) |
| manage_tempaddrs(idev, ifp, 0, 0, false, |
| jiffies); |
| ipv6_del_addr(ifp); |
| addrconf_verify_rtnl(); |
| if (ipv6_addr_is_multicast(pfx)) { |
| ipv6_mc_config(net->ipv6.mc_autojoin_sk, |
| false, pfx, dev->ifindex); |
| } |
| return 0; |
| } |
| } |
| read_unlock_bh(&idev->lock); |
| return -EADDRNOTAVAIL; |
| } |
| |
| |
| int addrconf_add_ifaddr(struct net *net, void __user *arg) |
| { |
| struct in6_ifreq ireq; |
| int err; |
| |
| if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
| return -EPERM; |
| |
| if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) |
| return -EFAULT; |
| |
| rtnl_lock(); |
| err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, |
| ireq.ifr6_prefixlen, IFA_F_PERMANENT, |
| INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); |
| rtnl_unlock(); |
| return err; |
| } |
| |
| int addrconf_del_ifaddr(struct net *net, void __user *arg) |
| { |
| struct in6_ifreq ireq; |
| int err; |
| |
| if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
| return -EPERM; |
| |
| if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) |
| return -EFAULT; |
| |
| rtnl_lock(); |
| err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, |
| ireq.ifr6_prefixlen); |
| rtnl_unlock(); |
| return err; |
| } |
| |
| static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, |
| int plen, int scope) |
| { |
| struct inet6_ifaddr *ifp; |
| |
| ifp = ipv6_add_addr(idev, addr, NULL, plen, |
| scope, IFA_F_PERMANENT, |
| INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); |
| if (!IS_ERR(ifp)) { |
| spin_lock_bh(&ifp->lock); |
| ifp->flags &= ~IFA_F_TENTATIVE; |
| spin_unlock_bh(&ifp->lock); |
| rt_genid_bump_ipv6(dev_net(idev->dev)); |
| ipv6_ifa_notify(RTM_NEWADDR, ifp); |
| in6_ifa_put(ifp); |
| } |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6_SIT) |
| static void sit_add_v4_addrs(struct inet6_dev *idev) |
| { |
| struct in6_addr addr; |
| struct net_device *dev; |
| struct net *net = dev_net(idev->dev); |
| int scope, plen; |
| u32 pflags = 0; |
| |
| ASSERT_RTNL(); |
| |
| memset(&addr, 0, sizeof(struct in6_addr)); |
| memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); |
| |
| if (idev->dev->flags&IFF_POINTOPOINT) { |
| addr.s6_addr32[0] = htonl(0xfe800000); |
| scope = IFA_LINK; |
| plen = 64; |
| } else { |
| scope = IPV6_ADDR_COMPATv4; |
| plen = 96; |
| pflags |= RTF_NONEXTHOP; |
| } |
| |
| if (addr.s6_addr32[3]) { |
| add_addr(idev, &addr, plen, scope); |
| addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); |
| return; |
| } |
| |
| for_each_netdev(net, dev) { |
| struct in_device *in_dev = __in_dev_get_rtnl(dev); |
| if (in_dev && (dev->flags & IFF_UP)) { |
| struct in_ifaddr *ifa; |
| |
| int flag = scope; |
| |
| for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
| |
| addr.s6_addr32[3] = ifa->ifa_local; |
| |
| if (ifa->ifa_scope == RT_SCOPE_LINK) |
| continue; |
| if (ifa->ifa_scope >= RT_SCOPE_HOST) { |
| if (idev->dev->flags&IFF_POINTOPOINT) |
| continue; |
| flag |= IFA_HOST; |
| } |
| |
| add_addr(idev, &addr, plen, flag); |
| addrconf_prefix_route(&addr, plen, idev->dev, 0, |
| pflags); |
| } |
| } |
| } |
| } |
| #endif |
| |
| static void init_loopback(struct net_device *dev) |
| { |
| struct inet6_dev *idev; |
| struct net_device *sp_dev; |
| struct inet6_ifaddr *sp_ifa; |
| struct rt6_info *sp_rt; |
| |
| /* ::1 */ |
| |
| ASSERT_RTNL(); |
| |
| idev = ipv6_find_idev(dev); |
| if (!idev) { |
| pr_debug("%s: add_dev failed\n", __func__); |
| return; |
| } |
| |
| add_addr(idev, &in6addr_loopback, 128, IFA_HOST); |
| |
| /* Add routes to other interface's IPv6 addresses */ |
| for_each_netdev(dev_net(dev), sp_dev) { |
| if (!strcmp(sp_dev->name, dev->name)) |
| continue; |
| |
| idev = __in6_dev_get(sp_dev); |
| if (!idev) |
| continue; |
| |
| read_lock_bh(&idev->lock); |
| list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { |
| |
| if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) |
| continue; |
| |
| if (sp_ifa->rt) { |
| /* This dst has been added to garbage list when |
| * lo device down, release this obsolete dst and |
| * reallocate a new router for ifa. |
| */ |
| if (!atomic_read(&sp_ifa->rt->rt6i_ref)) { |
| ip6_rt_put(sp_ifa->rt); |
| sp_ifa->rt = NULL; |
| } else { |
| continue; |
| } |
| } |
| |
| sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); |
| |
| /* Failure cases are ignored */ |
| if (!IS_ERR(sp_rt)) { |
| sp_ifa->rt = sp_rt; |
| ip6_ins_rt(sp_rt); |
| } |
| } |
| read_unlock_bh(&idev->lock); |
| } |
| } |
| |
| void addrconf_add_linklocal(struct inet6_dev *idev, |
| const struct in6_addr *addr, u32 flags) |
| { |
| struct inet6_ifaddr *ifp; |
| u32 addr_flags = flags | IFA_F_PERMANENT; |
| |
| #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
| if (idev->cnf.optimistic_dad && |
| !dev_net(idev->dev)->ipv6.devconf_all->forwarding) |
| addr_flags |= IFA_F_OPTIMISTIC; |
| #endif |
| |
| ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, |
| INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); |
| if (!IS_ERR(ifp)) { |
| addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); |
| addrconf_dad_start(ifp); |
| in6_ifa_put(ifp); |
| } |
| } |
| 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[SHA_DIGEST_WORDS]; |
| static __u32 workspace[SHA_WORKSPACE_WORDS]; |
| |
| static union { |
| char __data[SHA_MESSAGE_BYTES]; |
| struct { |
| struct in6_addr secret; |
| __be32 prefix[2]; |
| unsigned char hwaddr[MAX_ADDR_LEN]; |
| u8 dad_count; |
| } __packed; |
| } data; |
| |
| struct in6_addr secret; |
| struct in6_addr temp; |
| struct net *net = dev_net(idev->dev); |
| |
| BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); |
| |
| if (idev->cnf.stable_secret.initialized) |
| secret = idev->cnf.stable_secret.secret; |
| else if (net->ipv6.devconf_dflt->stable_secret.initialized) |
| secret = net->ipv6.devconf_dflt->stable_secret.secret; |
| else |
| return -1; |
| |
| retry: |
| spin_lock_bh(&lock); |
| |
| sha_init(digest); |
| memset(&data, 0, sizeof(data)); |
| memset(workspace, 0, sizeof(workspace)); |
| memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); |
| data.prefix[0] = address->s6_addr32[0]; |
| data.prefix[1] = address->s6_addr32[1]; |
| data.secret = secret; |
| data.dad_count = dad_count; |
| |
| sha_transform(digest, data.__data, workspace); |
| |
| temp = *address; |
| temp.s6_addr32[2] = (__force __be32)digest[0]; |
| temp.s6_addr32[3] = (__force __be32)digest[1]; |
| |
| spin_unlock_bh(&lock); |
| |
| if (ipv6_reserved_interfaceid(temp)) { |
| dad_count++; |
| if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) |
| return -1; |
| goto retry; |
| } |
| |
| *address = temp; |
| return 0; |
| } |
| |
| static void 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; |
| |
| 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, idev->dev, 0, 0); |
| 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, idev->dev, 0, 0); |
| 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_IP6GRE) && |
| (dev->type != ARPHRD_IPGRE) && |
| (dev->type != ARPHRD_TUNNEL) && |
| (dev->type != ARPHRD_NONE)) { |
| /* Alas, we support only Ethernet autoconfiguration. */ |
| 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 (!idev) { |
| pr_debug("%s: add_dev failed\n", __func__); |
| return; |
| } |
| |
| if (dev->priv_flags & IFF_ISATAP) { |
| addrconf_addr_gen(idev, false); |
| return; |
| } |
| |
| sit_add_v4_addrs(idev); |
| |
| if (dev->flags&IFF_POINTOPOINT) |
| addrconf_add_mroute(dev); |
| } |
| #endif |
| |
| #if IS_ENABLED(CONFIG_NET_IPGRE) |
| static void addrconf_gre_config(struct net_device *dev) |
| { |
| struct inet6_dev *idev; |
| |
| ASSERT_RTNL(); |
| |
| idev = ipv6_find_idev(dev); |
| if (!idev) { |
| pr_debug("%s: add_dev failed\n", __func__); |
| return; |
| } |
| |
| addrconf_addr_gen(idev, true); |
| if (dev->flags & IFF_POINTOPOINT) |
| addrconf_add_mroute(dev); |
| } |
| #endif |
| |
| static int fixup_permanent_addr(struct inet6_dev *idev, |
| struct inet6_ifaddr *ifp) |
| { |
| /* rt6i_ref == 0 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 || !atomic_read(&ifp->rt->rt6i_ref)) { |
| struct rt6_info *rt, *prev; |
| |
| rt = addrconf_dst_alloc(idev, &ifp->addr, false); |
| if (unlikely(IS_ERR(rt))) |
| return PTR_ERR(rt); |
| |
| /* ifp->rt can be accessed outside of rtnl */ |
| spin_lock(&ifp->lock); |
| prev = ifp->rt; |
| ifp->rt = rt; |
| spin_unlock(&ifp->lock); |
| |
| ip6_rt_put(prev); |
| } |
| |
| if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { |
| addrconf_prefix_route(&ifp->addr, ifp->prefix_len, |
| idev->dev, 0, 0); |
| } |
| |
| addrconf_dad_start(ifp); |
| |
| return 0; |
| } |
| |
| static void addrconf_permanent_addr(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(idev, ifp) < 0) { |
| write_unlock_bh(&idev->lock); |
| 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_changeupper_info *info; |
| struct inet6_dev *idev = __in6_dev_get(dev); |
| int run_pending = 0; |
| int err; |
| |
| switch (event) { |
| case NETDEV_REGISTER: |
| if (!idev && dev->mtu >= IPV6_MIN_MTU) { |
| idev = ipv6_add_dev(dev); |
| if (IS_ERR(idev)) |
| return notifier_from_errno(PTR_ERR(idev)); |
| } |
| break; |
| |
| case NETDEV_CHANGEMTU: |
| /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ |
| if (dev->mtu < IPV6_MIN_MTU) { |
| addrconf_ifdown(dev, 1); |
| 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; |
| |
| /* fall through */ |
| |
| case NETDEV_UP: |
| case NETDEV_CHANGE: |
| if (dev->flags & IFF_SLAVE) |
| break; |
| |
| if (idev && idev->cnf.disable_ipv6) |
| break; |
| |
| if (event == NETDEV_UP) { |
| /* restore routes for permanent addresses */ |
| addrconf_permanent_addr(dev); |
| |
| if (!addrconf_qdisc_ok(dev)) { |
| /* device is not ready yet. */ |
| pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", |
| dev->name); |
| break; |
| } |
| |
| if (!idev && dev->mtu >= IPV6_MIN_MTU) |
| idev = ipv6_add_dev(dev); |
| |
| if (!IS_ERR_OR_NULL(idev)) { |
| idev->if_flags |= IF_READY; |
| run_pending = 1; |
| } |
| } else if (event == NETDEV_CHANGE) { |
| if (!addrconf_qdisc_ok(dev)) { |
| /* device is still not ready. */ |
| break; |
| } |
| |
| if (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); |
| break; |
| } |
| idev->if_flags |= IF_READY; |
| } |
| |
| pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", |
| dev->name); |
| |
| run_pending = 1; |
| } |
| |
| switch (dev->type) { |
| #if IS_ENABLED(CONFIG_IPV6_SIT) |
| case ARPHRD_SIT: |
| addrconf_sit_config(dev); |
| break; |
| #endif |
| #if IS_ENABLED(CONFIG_NET_IPGRE) |
| case ARPHRD_IPGRE: |
| addrconf_gre_config(dev); |
| break; |
| #endif |
| case ARPHRD_LOOPBACK: |
| init_loopback(dev); |
| break; |
| |
| default: |
| addrconf_dev_config(dev); |
| break; |
| } |
| |
| if (!IS_ERR_OR_NULL(idev)) { |
| if (run_pending) |
| addrconf_dad_run(idev); |
| |
| /* |
| * If the MTU changed during the interface down, |
| * when the interface up, the changed MTU must be |
| * reflected in the idev as well as routers. |
| */ |
| if (idev->cnf.mtu6 != dev->mtu && |
| dev->mtu >= IPV6_MIN_MTU) { |
| rt6_mtu_change(dev, dev->mtu); |
| idev->cnf.mtu6 = dev->mtu; |
| } |
| idev->tstamp = jiffies; |
| inet6_ifinfo_notify(RTM_NEWLINK, idev); |
| |
| /* |
| * If the changed mtu during down is lower than |
| * IPV6_MIN_MTU stop IPv6 on this interface. |
| */ |
| if (dev->mtu < IPV6_MIN_MTU) |
| addrconf_ifdown(dev, 1); |
| } |
| break; |
| |
| case NETDEV_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, 0); |
| } |
| |
| return NOTIFY_OK; |
| } |
| |
| /* |
| * addrconf module should be notified of a device going up |
| */ |
| static struct notifier_block ipv6_dev_notf = { |
| .notifier_call = addrconf_notify, |
| }; |
| |
| static void addrconf_type_change(struct net_device *dev, unsigned long event) |
| { |
| struct inet6_dev *idev; |
| ASSERT_RTNL(); |
| |
| idev = __in6_dev_get(dev); |
| |
| if (event == NETDEV_POST_TYPE_CHANGE) |
| ipv6_mc_remap(idev); |
| else if (event == NETDEV_PRE_TYPE_CHANGE) |
| ipv6_mc_unmap(idev); |
| } |
| |
| static 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, int how) |
| { |
| struct net *net = dev_net(dev); |
| struct inet6_dev *idev; |
| struct inet6_ifaddr *ifa, *tmp; |
| struct list_head del_list; |
| int _keep_addr; |
| bool keep_addr; |
| int state, i; |
| |
| ASSERT_RTNL(); |
| |
| rt6_ifdown(net, dev); |
| neigh_ifdown(&nd_tbl, dev); |
| |
| idev = __in6_dev_get(dev); |
| if (!idev) |
| return -ENODEV; |
| |
| /* |
| * Step 1: remove reference to ipv6 device from parent device. |
| * Do not dev_put! |
| */ |
| if (how) { |
| idev->dead = 1; |
| |
| /* protected by rtnl_lock */ |
| RCU_INIT_POINTER(dev->ip6_ptr, NULL); |
| |
| /* Step 1.5: remove snmp6 entry */ |
| snmp6_unregister_dev(idev); |
| |
| } |
| |
| /* aggregate the system setting and interface setting */ |
| _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; |
| if (!_keep_addr) |
| _keep_addr = idev->cnf.keep_addr_on_down; |
| |
| /* combine the user config with event to determine if permanent |
| * addresses are to be removed from address hash table |
| */ |
| keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6); |
| |
| /* Step 2: clear hash table */ |
| for (i = 0; i < IN6_ADDR_HSIZE; i++) { |
| struct hlist_head *h = &inet6_addr_lst[i]; |
| |
| spin_lock_bh(&addrconf_hash_lock); |
| restart: |
| hlist_for_each_entry_rcu(ifa, h, addr_lst) { |
| if (ifa->idev == idev) { |
| 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(&addrconf_hash_lock); |
| } |
| |
| write_lock_bh(&idev->lock); |
| |
| addrconf_del_rs_timer(idev); |
| |
| /* Step 2: clear flags for stateless addrconf */ |
| if (!how) |
| idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); |
| |
| /* 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); |
| } |
| |
| /* re-combine the user config with event to determine if permanent |
| * addresses are to be removed from the interface list |
| */ |
| keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6); |
| |
| INIT_LIST_HEAD(&del_list); |
| list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { |
| struct rt6_info *rt = NULL; |
| bool keep; |
| |
| addrconf_del_dad_work(ifa); |
| |
| keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && |
| !addr_is_local(&ifa->addr); |
| if (!keep) |
| list_move(&ifa->if_list, &del_list); |
| |
| write_unlock_bh(&idev->lock); |
| spin_lock_bh(&ifa->lock); |
| |
| if (keep) { |
| /* set state to skip the notifier below */ |
| state = INET6_IFADDR_STATE_DEAD; |
| ifa->state = 0; |
| 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(rt); |
| |
| 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); |
| } |
| |
| write_lock_bh(&idev->lock); |
| } |
| |
| write_unlock_bh(&idev->lock); |
| |
| /* now clean up addresses to be removed */ |
| while (!list_empty(&del_list)) { |
| ifa = list_first_entry(&del_list, |
| struct inet6_ifaddr, if_list); |
| list_del(&ifa->if_list); |
| |
| in6_ifa_put(ifa); |
| } |
| |
| /* Step 5: Discard anycast and multicast list */ |
| if (how) { |
| ipv6_ac_destroy_dev(idev); |
| ipv6_mc_destroy_dev(idev); |
| } else { |
| ipv6_mc_down(idev); |
| } |
| |
| idev->tstamp = jiffies; |
| |
| /* Last: Shot the device (if unregistered) */ |
| if (how) { |
| addrconf_sysctl_unregister(idev); |
| neigh_parms_release(&nd_tbl, idev->nd_parms); |
| neigh_ifdown(&nd_tbl, dev); |
| in6_dev_put(idev); |
| } |
| return 0; |
| } |
| |
| static void addrconf_rs_timer(unsigned long data) |
| { |
| struct inet6_dev *idev = (struct inet6_dev *)data; |
| struct net_device *dev = idev->dev; |
| struct in6_addr lladdr; |
| |
| write_lock(&idev->lock); |
| if (idev->dead || !(idev->if_flags & IF_READY)) |
| goto out; |
| |
| if (!ipv6_accept_ra(idev)) |
| goto out; |
| |
| /* Announcement received after solicitation was sent */ |
| if (idev->if_flags & IF_RA_RCVD) |
| goto out; |
| |
| if (idev->rs_probes++ < idev->cnf.rtr_solicits || 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() % (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; |
| |
| addrconf_join_solict(dev, &ifp->addr); |
| |
| prandom_seed((__force u32) ifp->addr.s6_addr32[3]); |
| |
| read_lock_bh(&idev->lock); |
| spin_lock(&ifp->lock); |
| if (ifp->state == INET6_IFADDR_STATE_DEAD) |
| goto out; |
| |
| if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || |
| idev->cnf.accept_dad < 1 || |
| !(ifp->flags&IFA_F_TENTATIVE) || |
| ifp->flags & IFA_F_NODAD) { |
| 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); |
| return; |
| } |
| |
| if (!(idev->if_flags & IF_READY)) { |
| spin_unlock(&ifp->lock); |
| read_unlock_bh(&idev->lock); |
| /* |
| * If the device is not ready: |
| * - keep it tentative if it is a permanent address. |
| * - otherwise, kill it. |
| */ |
| in6_ifa_hold(ifp); |
| addrconf_dad_stop(ifp, 0); |
| return; |
| } |
| |
| /* |
| * Optimistic nodes can start receiving |
| * Frames right away |
| */ |
| if (ifp->flags & IFA_F_OPTIMISTIC) { |
| ip6_ins_rt(ifp->rt); |
| if (ipv6_use_optimistic_addr(idev)) { |
| /* Because optimistic nodes can use this address, |
| * notify listeners. If DAD fails, RTM_DELADDR is sent. |
| */ |
| 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 (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, 0); |
| goto out; |
| } |
| |
| if (!ifp->dad_probes && addrconf_dad_end(ifp)) |
| goto out; |
| |
| write_lock_bh(&idev->lock); |
| if (idev->dead || !(idev->if_flags & IF_READY)) { |
| write_unlock_bh(&idev->lock); |
| goto out; |
| } |
| |
| spin_lock(&ifp->lock); |
| if (ifp->state == INET6_IFADDR_STATE_DEAD) { |
| spin_unlock(&ifp->lock); |
| write_unlock_bh(&idev->lock); |
| goto out; |
| } |
| |
| if (ifp->dad_probes == 0) { |
| /* |
| * DAD was successful |
| */ |
| |
| 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); |
| |
| goto out; |
| } |
| |
| ifp->dad_probes--; |
| addrconf_mod_dad_work(ifp, |
| NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); |
| spin_unlock(&ifp->lock); |
| write_unlock_bh(&idev->lock); |
| |
| /* send a neighbour solicitation for our addr */ |
| addrconf_addr_solict_mult(&ifp->addr, &mcaddr); |
| ndisc_send_ns(ifp->idev->dev, &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) |
| { |
| struct net_device *dev = ifp->idev->dev; |
| struct in6_addr lladdr; |
| bool send_rs, send_mld; |
| |
| addrconf_del_dad_work(ifp); |
| |
| /* |
| * Configure the address for reception. Now it is valid. |
| */ |
| |
| ipv6_ifa_notify(RTM_NEWADDR, ifp); |
| |
| /* If added prefix is link local and we are prepared to process |
| router advertisements, start sending router solicitations. |
| */ |
| |
| read_lock_bh(&ifp->idev->lock); |
| send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); |
| send_rs = send_mld && |
| ipv6_accept_ra(ifp->idev) && |
| ifp->idev->cnf.rtr_solicits != 0 && |
| (dev->flags&IFF_LOOPBACK) == 0; |
| read_unlock_bh(&ifp->idev->lock); |
| |
| /* While dad is in progress mld report's source address is in6_addrany. |
| * Resend with proper ll now. |
| */ |
| if (send_mld) |
| ipv6_mc_dad_complete(ifp->idev); |
| |
| if (send_rs) { |
| /* |
| * If a host as already performed a random delay |
| * [...] as part of DAD [...] there is no need |
| * to delay again before sending the first RS |
| */ |
| if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) |
| return; |
| ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); |
| |
| write_lock_bh(&ifp->idev->lock); |
| spin_lock(&ifp->lock); |
| ifp->idev->rs_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(); |
| } |
| |
| static void addrconf_dad_run(struct inet6_dev *idev) |
| { |
| struct inet6_ifaddr *ifp; |
| |
| read_lock_bh(&idev->lock); |
| list_for_each_entry(ifp, &idev->addr_list, if_list) { |
| spin_lock(&ifp->lock); |
| if (ifp->flags & IFA_F_TENTATIVE && |
| ifp->state == INET6_IFADDR_STATE_DAD) |
| addrconf_dad_kick(ifp); |
| spin_unlock(&ifp->lock); |
| } |
| read_unlock_bh(&idev->lock); |
| } |
| |
| #ifdef CONFIG_PROC_FS |
| struct if6_iter_state { |
| struct seq_net_private p; |
| int bucket; |
| int offset; |
| }; |
| |
| static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) |
| { |
| struct inet6_ifaddr *ifa = NULL; |
| struct if6_iter_state *state = seq->private; |
| struct net *net = seq_file_net(seq); |
| int p = 0; |
| |
| /* initial bucket if pos is 0 */ |
| if (pos == 0) { |
| state->bucket = 0; |
| state->offset = 0; |
| } |
| |
| for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { |
| hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], |
| addr_lst) { |
| if (!net_eq(dev_net(ifa->idev->dev), net)) |
| continue; |
| /* sync with offset */ |
| if (p < state->offset) { |
| p++; |
| continue; |
| } |
| state->offset++; |
| return ifa; |
| } |
| |
| /* prepare for next bucket */ |
| state->offset = 0; |
| p = 0; |
| } |
| return NULL; |
| } |
| |
| static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, |
| struct inet6_ifaddr *ifa) |
| { |
| struct if6_iter_state *state = seq->private; |
| struct net *net = seq_file_net(seq); |
| |
| hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { |
| if (!net_eq(dev_net(ifa->idev->dev), net)) |
| continue; |
| state->offset++; |
| return ifa; |
| } |
| |
| while (++state->bucket < IN6_ADDR_HSIZE) { |
| state->offset = 0; |
| hlist_for_each_entry_rcu_bh(ifa, |
| &inet6_addr_lst[state->bucket], addr_lst) { |
| if (!net_eq(dev_net(ifa->idev->dev), net)) |
| continue; |
| state->offset++; |
| return ifa; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| static void *if6_seq_start(struct seq_file *seq, loff_t *pos) |
| __acquires(rcu_bh) |
| { |
| rcu_read_lock_bh(); |
| return if6_get_first(seq, *pos); |
| } |
| |
| static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| { |
| struct inet6_ifaddr *ifa; |
| |
| ifa = if6_get_next(seq, v); |
| ++*pos; |
| return ifa; |
| } |
| |
| static void if6_seq_stop(struct seq_file *seq, void *v) |
| __releases(rcu_bh) |
| { |
| rcu_read_unlock_bh(); |
| } |
| |
| static int if6_seq_show(struct seq_file *seq, void *v) |
| { |
| struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; |
| seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", |
| &ifp->addr, |
| ifp->idev->dev->ifindex, |
| ifp->prefix_len, |
| ifp->scope, |
| (u8) ifp->flags, |
| ifp->idev->dev->name); |
| return 0; |
| } |
| |
| static const struct seq_operations if6_seq_ops = { |
| .start = if6_seq_start, |
| .next = if6_seq_next, |
| .show = if6_seq_show, |
| .stop = if6_seq_stop, |
| }; |
| |
| static int if6_seq_open(struct inode *inode, struct file *file) |
| { |
| return seq_open_net(inode, file, &if6_seq_ops, |
| sizeof(struct if6_iter_state)); |
| } |
| |
| static const struct file_operations if6_fops = { |
| .owner = THIS_MODULE, |
| .open = if6_seq_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = seq_release_net, |
| }; |
| |
| static int __net_init if6_proc_net_init(struct net *net) |
| { |
| if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) |
| return -ENOMEM; |
| return 0; |
| } |
| |
| static void __net_exit if6_proc_net_exit(struct net *net) |
| { |
| remove_proc_entry("if_inet6", net->proc_net); |
| } |
| |
| static struct pernet_operations if6_proc_net_ops = { |
| .init = if6_proc_net_init, |
| .exit = if6_proc_net_exit, |
| }; |
| |
| int __init if6_proc_init(void) |
| { |
| return register_pernet_subsys(&if6_proc_net_ops); |
| } |
| |
| void if6_proc_exit(void) |
| { |
| unregister_pernet_subsys(&if6_proc_net_ops); |
| } |
| #endif /* CONFIG_PROC_FS */ |
| |
| #if IS_ENABLED(CONFIG_IPV6_MIP6) |
| /* Check if address is a home address configured on any interface. */ |
| int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) |
| { |
| int ret = 0; |
| struct inet6_ifaddr *ifp = NULL; |
| unsigned int hash = inet6_addr_hash(addr); |
| |
| rcu_read_lock_bh(); |
| hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { |
| if (!net_eq(dev_net(ifp->idev->dev), net)) |
| continue; |
| if (ipv6_addr_equal(&ifp->addr, addr) && |
| (ifp->flags & IFA_F_HOMEADDRESS)) { |
| ret = 1; |
| break; |
| } |
| } |
| rcu_read_unlock_bh(); |
| return ret; |
| } |
| #endif |
| |
| /* |
| * Periodic address status verification |
| */ |
| |
| static void addrconf_verify_rtnl(void) |
| { |
| unsigned long now, next, next_sec, next_sched; |
| struct inet6_ifaddr *ifp; |
| int i; |
| |
| ASSERT_RTNL(); |
| |
| rcu_read_lock_bh(); |
| now = jiffies; |
| next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); |
| |
| cancel_delayed_work(&addr_chk_work); |
| |
| for (i = 0; i < IN6_ADDR_HSIZE; i++) { |
| restart: |
| hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { |
| unsigned long age; |
| |
| /* When setting preferred_lft to a value not zero or |
| * infinity, while valid_lft is infinity |
| * IFA_F_PERMANENT has a non-infinity life time. |
| */ |
| if ((ifp->flags & IFA_F_PERMANENT) && |
| (ifp->prefered_lft == INFINITY_LIFE_TIME)) |
| continue; |
| |
| spin_lock(&ifp->lock); |
| /* We try to batch several events at once. */ |
| age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; |
| |
| if (ifp->valid_lft != INFINITY_LIFE_TIME && |
| age >= ifp->valid_lft) { |
| spin_unlock(&ifp->lock); |
| in6_ifa_hold(ifp); |
| ipv6_del_addr(ifp); |
| goto restart; |
| } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { |
| spin_unlock(&ifp->lock); |
| continue; |
| } else if (age >= ifp->prefered_lft) { |
| /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ |
| int deprecate = 0; |
| |
| if (!(ifp->flags&IFA_F_DEPRECATED)) { |
| deprecate = 1; |
| ifp->flags |= IFA_F_DEPRECATED; |
| } |
| |
| if ((ifp->valid_lft != INFINITY_LIFE_TIME) && |
| (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) |
| next = ifp->tstamp + ifp->valid_lft * HZ; |
| |
| spin_unlock(&ifp->lock); |
| |
| if (deprecate) { |
| in6_ifa_hold(ifp); |
| |
| ipv6_ifa_notify(0, ifp); |
| in6_ifa_put(ifp); |
| goto restart; |
| } |
| } else if ((ifp->flags&IFA_F_TEMPORARY) && |
| !(ifp->flags&IFA_F_TENTATIVE)) { |
| unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * |
| ifp->idev->cnf.dad_transmits * |
| NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; |
| |
| if (age >= ifp->prefered_lft - regen_advance) { |
| struct inet6_ifaddr *ifpub = ifp->ifpub; |
| if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) |
| next = ifp->tstamp + ifp->prefered_lft * HZ; |
| if (!ifp->regen_count && ifpub) { |
| ifp->regen_count++; |
| in6_ifa_hold(ifp); |
| in6_ifa_hold(ifpub); |
| spin_unlock(&ifp->lock); |
| |
| spin_lock(&ifpub->lock); |
| ifpub->regen_count = 0; |
| spin_unlock(&ifpub->lock); |
| ipv6_create_tempaddr(ifpub, ifp); |
| in6_ifa_put(ifpub); |
| in6_ifa_put(ifp); |
| goto restart; |
| } |
| } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) |
| next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; |
| spin_unlock(&ifp->lock); |
| } else { |
| /* ifp->prefered_lft <= ifp->valid_lft */ |
| if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) |
| next = ifp->tstamp + ifp->prefered_lft * HZ; |
| spin_unlock(&ifp->lock); |
| } |
| } |
| } |
| |
| next_sec = round_jiffies_up(next); |
| next_sched = next; |
| |
| /* If rounded timeout is accurate enough, accept it. */ |
| if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) |
| next_sched = next_sec; |
| |
| /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ |
| if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) |
| next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; |
| |
| ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", |
| now, next, next_sec, next_sched); |
| mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); |
| rcu_read_unlock_bh(); |
| } |
| |
| static void addrconf_verify_work(struct work_struct *w) |
| { |
| rtnl_lock(); |
| addrconf_verify_rtnl(); |
| rtnl_unlock(); |
| } |
| |
| static void addrconf_verify(void) |
| { |
| mod_delayed_work(addrconf_wq, &addr_chk_work, 0); |
| } |
| |
| static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, |
| struct in6_addr **peer_pfx) |
| { |
| struct in6_addr *pfx = NULL; |
| |
| *peer_pfx = NULL; |
| |
| if (addr) |
| pfx = nla_data(addr); |
| |
| if (local) { |
| if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) |
| *peer_pfx = pfx; |
| pfx = nla_data(local); |
| } |
| |
| return pfx; |
| } |
| |
| static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { |
| [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, |
| [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, |
| [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, |
| [IFA_FLAGS] = { .len = sizeof(u32) }, |
| }; |
| |
| static int |
| inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, |
| struct 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(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 inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, |
| u32 prefered_lft, u32 valid_lft) |
| { |
| u32 flags; |
| clock_t expires; |
| unsigned long timeout; |
| bool was_managetempaddr; |
| bool had_prefixroute; |
| |
| ASSERT_RTNL(); |
| |
| if (!valid_lft || (prefered_lft > valid_lft)) |
| return -EINVAL; |
| |
| if (ifa_flags & IFA_F_MANAGETEMPADDR && |
| (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) |
| return -EINVAL; |
| |
| timeout = addrconf_timeout_fixup(valid_lft, HZ); |
| if (addrconf_finite_timeout(timeout)) { |
| expires = jiffies_to_clock_t(timeout * HZ); |
| valid_lft = timeout; |
| flags = RTF_EXPIRES; |
| } else { |
| expires = 0; |
| flags = 0; |
| ifa_flags |= IFA_F_PERMANENT; |
| } |
| |
| timeout = addrconf_timeout_fixup(prefered_lft, HZ); |
| if (addrconf_finite_timeout(timeout)) { |
| if (timeout == 0) |
| ifa_flags |= IFA_F_DEPRECATED; |
| prefered_lft = timeout; |
| } |
| |
| spin_lock_bh(&ifp->lock); |
| was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; |
| had_prefixroute = ifp->flags & IFA_F_PERMANENT && |
| !(ifp->flags & IFA_F_NOPREFIXROUTE); |
| ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | |
| IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | |
| IFA_F_NOPREFIXROUTE); |
| ifp->flags |= ifa_flags; |
| ifp->tstamp = jiffies; |
| ifp->valid_lft = valid_lft; |
| ifp->prefered_lft = prefered_lft; |
| |
| spin_unlock_bh(&ifp->lock); |
| if (!(ifp->flags&IFA_F_TENTATIVE)) |
| ipv6_ifa_notify(0, ifp); |
| |
| if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { |
| addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, |
| expires, flags); |
| } else if (had_prefixroute) { |
| enum cleanup_prefix_rt_t action; |
| unsigned long rt_expires; |
| |
| write_lock_bh(&ifp->idev->lock); |
| action = check_cleanup_prefix_route(ifp, &rt_expires); |
| write_unlock_bh(&ifp->idev->lock); |
| |
| if (action != CLEANUP_PREFIX_RT_NOP) { |
| cleanup_prefix_route(ifp, rt_expires, |
| action == CLEANUP_PREFIX_RT_DEL); |
| } |
| } |
| |
| if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { |
| if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) |
| valid_lft = prefered_lft = 0; |
| manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, |
| !was_managetempaddr, jiffies); |
| } |
| |
| addrconf_verify_rtnl(); |
| |
| return 0; |
| } |
| |
| static int |
| inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, |
| struct 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; |
| struct inet6_ifaddr *ifa; |
| struct net_device *dev; |
| u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; |
| u32 ifa_flags; |
| int err; |
| |
| err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, |
| 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; |
| |
| if (tb[IFA_CACHEINFO]) { |
| struct ifa_cacheinfo *ci; |
| |
| ci = nla_data(tb[IFA_CACHEINFO]); |
| valid_lft = ci->ifa_valid; |
| preferred_lft = ci->ifa_prefered; |
| } else { |
| preferred_lft = INFINITY_LIFE_TIME; |
| valid_lft = INFINITY_LIFE_TIME; |
| } |
| |
| dev = __dev_get_by_index(net, ifm->ifa_index); |
| if (!dev) |
| return -ENODEV; |
| |
| ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; |
| |
| /* We ignore other flags so far. */ |
| ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | |
| IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; |
| |
| ifa = ipv6_get_ifaddr(net, pfx, dev, 1); |
| if (!ifa) { |
| /* |
| * It would be best to check for !NLM_F_CREATE here but |
| * userspace already relies on not having to provide this. |
| */ |
| return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, |
| ifm->ifa_prefixlen, ifa_flags, |
| preferred_lft, valid_lft); |
| } |
| |
| if (nlh->nlmsg_flags & NLM_F_EXCL || |
| !(nlh->nlmsg_flags & NLM_F_REPLACE)) |
| err = -EEXIST; |
| else |
| err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); |
| |
| in6_ifa_put(ifa); |
| |
| return err; |
| } |
| |
| static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, |
| u8 scope, int ifindex) |
| { |
| struct ifaddrmsg *ifm; |
| |
| ifm = nlmsg_data(nlh); |
| ifm->ifa_family = AF_INET6; |
| ifm->ifa_prefixlen = prefixlen; |
| ifm->ifa_flags = flags; |
| ifm->ifa_scope = scope; |
| ifm->ifa_index = ifindex; |
| } |
| |
| static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, |
| unsigned long tstamp, u32 preferred, u32 valid) |
| { |
| struct ifa_cacheinfo ci; |
| |
| ci.cstamp = cstamp_delta(cstamp); |
| ci.tstamp = cstamp_delta(tstamp); |
| ci.ifa_prefered = preferred; |
| ci.ifa_valid = valid; |
| |
| return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); |
| } |
| |
| static inline int rt_scope(int ifa_scope) |
| { |
| if (ifa_scope & IFA_HOST) |
| return RT_SCOPE_HOST; |
| else if (ifa_scope & IFA_LINK) |
| return RT_SCOPE_LINK; |
| else if (ifa_scope & IFA_SITE) |
| return RT_SCOPE_SITE; |
| else |
| return RT_SCOPE_UNIVERSE; |
| } |
| |
| static inline int inet6_ifaddr_msgsize(void) |
| { |
| return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) |
| + nla_total_size(16) /* IFA_LOCAL */ |
| + nla_total_size(16) /* IFA_ADDRESS */ |
| + nla_total_size(sizeof(struct ifa_cacheinfo)) |
| + nla_total_size(4) /* IFA_FLAGS */; |
| } |
| |
| static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, |
| u32 portid, u32 seq, int event, unsigned int flags) |
| { |
| struct nlmsghdr *nlh; |
| u32 preferred, valid; |
| |
| nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); |
| if (!nlh) |
| return -EMSGSIZE; |
| |
| put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), |
| ifa->idev->dev->ifindex); |
| |
| if (!((ifa->flags&IFA_F_PERMANENT) && |
| (ifa->prefered_lft == INFINITY_LIFE_TIME))) { |
| preferred = ifa->prefered_lft; |
| valid = ifa->valid_lft; |
| if (preferred != INFINITY_LIFE_TIME) { |
| long tval = (jiffies - ifa->tstamp)/HZ; |
| if (preferred > tval) |
| preferred -= tval; |
| else |
| preferred = 0; |
| if (valid != INFINITY_LIFE_TIME) { |
| if (valid > tval) |
| valid -= tval; |
| else |
| valid = 0; |
| } |
| } |
| } else { |
| preferred = INFINITY_LIFE_TIME; |
| valid = INFINITY_LIFE_TIME; |
| } |
| |
| if (!ipv6_addr_any(&ifa->peer_addr)) { |
| if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || |
| nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) |
| goto error; |
| } else |
| if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) |
| goto error; |
| |
| if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) |
| goto error; |
| |
| if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) |
| goto error; |
| |
| nlmsg_end(skb, nlh); |
| return 0; |
| |
| error: |
| nlmsg_cancel(skb, nlh); |
| return -EMSGSIZE; |
| } |
| |
| static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, |
| u32 portid, u32 seq, int event, u16 flags) |
| { |
| struct nlmsghdr *nlh; |
| u8 scope = RT_SCOPE_UNIVERSE; |
| int ifindex = ifmca->idev->dev->ifindex; |
| |
| if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) |
| scope = RT_SCOPE_SITE; |
| |
| nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); |
| if (!nlh) |
| return -EMSGSIZE; |
| |
| put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); |
| if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || |
| put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, |
| INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { |
| nlmsg_cancel(skb, nlh); |
| return -EMSGSIZE; |
| } |
| |
| nlmsg_end(skb, nlh); |
| return 0; |
| } |
| |
| static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, |
| u32 portid, u32 seq, int event, unsigned int flags) |
| { |
| struct nlmsghdr *nlh; |
| u8 scope = RT_SCOPE_UNIVERSE; |
| int ifindex = ifaca->aca_idev->dev->ifindex; |
| |
| if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) |
| scope = RT_SCOPE_SITE; |
| |
| nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); |
| if (!nlh) |
| return -EMSGSIZE; |
| |
| put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); |
| if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || |
| put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, |
| INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { |
| nlmsg_cancel(skb, nlh); |
| return -EMSGSIZE; |
| } |
| |
| nlmsg_end(skb, nlh); |
| return 0; |
| } |
| |
| enum addr_type_t { |
| UNICAST_ADDR, |
| MULTICAST_ADDR, |
| ANYCAST_ADDR, |
| }; |
| |
| /* called with rcu_read_lock() */ |
| static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, |
| struct netlink_callback *cb, enum addr_type_t type, |
| int s_ip_idx, int *p_ip_idx) |
| { |
| struct ifmcaddr6 *ifmca; |
| struct ifacaddr6 *ifaca; |
| int err = 1; |
| int ip_idx = *p_ip_idx; |
| |
| read_lock_bh(&idev->lock); |
| switch (type) { |
| case UNICAST_ADDR: { |
| struct inet6_ifaddr *ifa; |
| |
| /* unicast address incl. temp addr */ |
| list_for_each_entry(ifa, &idev->addr_list, if_list) { |
| if (++ip_idx < s_ip_idx) |
| continue; |
| err = inet6_fill_ifaddr(skb, ifa, |
| NETLINK_CB(cb->skb).portid, |
| cb->nlh->nlmsg_seq, |
| RTM_NEWADDR, |
| NLM_F_MULTI); |
| if (err < 0) |
| break; |
| nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
| } |
| break; |
| } |
| case MULTICAST_ADDR: |
| /* multicast address */ |
| for (ifmca = idev->mc_list; ifmca; |
| ifmca = ifmca->next, ip_idx++) { |
| if (ip_idx < s_ip_idx) |
| continue; |
| err = inet6_fill_ifmcaddr(skb, ifmca, |
| NETLINK_CB(cb->skb).portid, |
| cb->nlh->nlmsg_seq, |
| RTM_GETMULTICAST, |
| NLM_F_MULTI); |
| if (err < 0) |
| break; |
| } |
| break; |
| case ANYCAST_ADDR: |
| /* anycast address */ |
| for (ifaca = idev->ac_list; ifaca; |
| ifaca = ifaca->aca_next, ip_idx++) { |
| if (ip_idx < s_ip_idx) |
| continue; |
| err = inet6_fill_ifacaddr(skb, ifaca, |
| NETLINK_CB(cb->skb).portid, |
| cb->nlh->nlmsg_seq, |
| RTM_GETANYCAST, |
| NLM_F_MULTI); |
| if (err < 0) |
| break; |
| } |
| break; |
| default: |
| break; |
| } |
| read_unlock_bh(&idev->lock); |
| *p_ip_idx = ip_idx; |
| return err; |
| } |
| |
| static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, |
| enum addr_type_t type) |
| { |
| struct net *net = sock_net(skb->sk); |
| int h, s_h; |
| int idx, ip_idx; |
| int s_idx, s_ip_idx; |
| struct net_device *dev; |
| struct inet6_dev *idev; |
| struct hlist_head *head; |
| |
| s_h = cb->args[0]; |
| s_idx = idx = cb->args[1]; |
| s_ip_idx = ip_idx = cb->args[2]; |
| |
| rcu_read_lock(); |
| cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; |
| for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { |
| idx = 0; |
| head = &net->dev_index_head[h]; |
| hlist_for_each_entry_rcu(dev, head, index_hlist) { |
| if (idx < s_idx) |
| goto cont; |
| if (h > s_h || idx > s_idx) |
| s_ip_idx = 0; |
| ip_idx = 0; |
| idev = __in6_dev_get(dev); |
| if (!idev) |
| goto cont; |
| |
| if (in6_dump_addrs(idev, skb, cb, type, |
| s_ip_idx, &ip_idx) < 0) |
| goto done; |
| cont: |
| idx++; |
| } |
| } |
| done: |
| rcu_read_unlock(); |
| cb->args[0] = h; |
| cb->args[1] = idx; |
| cb->args[2] = ip_idx; |
| |
| return skb->len; |
| } |
| |
| static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| enum addr_type_t type = UNICAST_ADDR; |
| |
| return inet6_dump_addr(skb, cb, type); |
| } |
| |
| static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| enum addr_type_t type = MULTICAST_ADDR; |
| |
| return inet6_dump_addr(skb, cb, type); |
| } |
| |
| |
| static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| enum addr_type_t type = ANYCAST_ADDR; |
| |
| return inet6_dump_addr(skb, cb, type); |
| } |
| |
| static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, |
| struct netlink_ext_ack *extack) |
| { |
| struct net *net = sock_net(in_skb->sk); |
| struct ifaddrmsg *ifm; |
| struct nlattr *tb[IFA_MAX+1]; |
| struct in6_addr *addr = NULL, *peer; |
| struct net_device *dev = NULL; |
| struct inet6_ifaddr *ifa; |
| struct sk_buff *skb; |
| int err; |
| |
| err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, |
| extack); |
| if (err < 0) |
| goto errout; |
| |
| addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); |
| if (!addr) { |
| err = -EINVAL; |
| goto errout; |
| } |
| |
| ifm = nlmsg_data(nlh); |
| if (ifm->ifa_index) |
| dev = __dev_get_by_index(net, ifm->ifa_index); |
| |
| ifa = ipv6_get_ifaddr(net, addr, dev, 1); |
| if (!ifa) { |
| err = -EADDRNOTAVAIL; |
| goto errout; |
| } |
| |
| skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); |
| if (!skb) { |
| err = -ENOBUFS; |
| goto errout_ifa; |
| } |
| |
| err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, |
| nlh->nlmsg_seq, RTM_NEWADDR, 0); |
| if (err < 0) { |
| /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ |
| WARN_ON(err == -EMSGSIZE); |
| kfree_skb(skb); |
| goto errout_ifa; |
| } |
| err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
| errout_ifa: |
| in6_ifa_put(ifa); |
| errout: |
| return err; |
| } |
| |
| static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) |
| { |
| struct sk_buff *skb; |
| struct net *net = dev_net(ifa->idev->dev); |
| int err = -ENOBUFS; |
| |
| /* Don't send DELADDR notification for TENTATIVE address, |
| * since NEWADDR notification is sent only after removing |
| * TENTATIVE flag. |
| */ |
| if (ifa->flags & IFA_F_TENTATIVE && event == RTM_DELADDR) |
| return; |
| |
| skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); |
| if (!skb) |
| goto errout; |
| |
| err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); |
| if (err < 0) { |
| /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ |
| WARN_ON(err == -EMSGSIZE); |
| kfree_skb(skb); |
| goto errout; |
| } |
| rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); |
| return; |
| errout: |
| if (err < 0) |
| rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); |
| } |
| |
| static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, |
| __s32 *array, int bytes) |
| { |
| BUG_ON(bytes < (DEVCONF_MAX * 4)); |
| |
| memset(array, 0, bytes); |
| array[DEVCONF_FORWARDING] = cnf->forwarding; |
| array[DEVCONF_HOPLIMIT] = cnf->hop_limit; |
| array[DEVCONF_MTU6] = cnf->mtu6; |
| array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; |
| array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; |
| array[DEVCONF_AUTOCONF] = cnf->autoconf; |
| array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; |
| array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; |
| array[DEVCONF_RTR_SOLICIT_INTERVAL] = |
| jiffies_to_msecs(cnf->rtr_solicit_interval); |
| array[DEVCONF_RTR_SOLICIT_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_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] = 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; |
| } |
| |
| static inline size_t inet6_ifla6_size(void) |
| { |
| return nla_total_size(4) /* IFLA_INET6_FLAGS */ |
| + nla_total_size(sizeof(struct ifla_cacheinfo)) |
| + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ |
| + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ |
| + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ |
| + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ |
| } |
| |
| static inline size_t inet6_if_nlmsg_size(void) |
| { |
| return NLMSG_ALIGN(sizeof(struct ifinfomsg)) |
| + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ |
| + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ |
| + nla_total_size(4) /* IFLA_MTU */ |
| + nla_total_size(4) /* IFLA_LINK */ |
| + nla_total_size(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; |
| |
| if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) |
| goto nla_put_failure; |
| |
| read_lock_bh(&idev->lock); |
| memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); |
| read_unlock_bh(&idev->lock); |
| |
| return 0; |
| |
| nla_put_failure: |
| return -EMSGSIZE; |
| } |
| |
| static size_t inet6_get_link_af_size(const struct net_device *dev, |
| 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 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 | IFF_NOARP)) |
| return -EINVAL; |
| if (!ipv6_accept_ra(idev)) |
| return -EINVAL; |
| if (idev->cnf.rtr_solicits == 0) |
| return -EINVAL; |
| |
| write_lock_bh(&idev->lock); |
| |
| BUILD_BUG_ON(sizeof(token->s6_addr) != 16); |
| memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); |
| |
| write_unlock_bh(&idev->lock); |
| |
| 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(); |
| return 0; |
| } |
| |
| static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { |
| [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, |
| [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, |
| }; |
| |
| static int inet6_validate_link_af(const struct net_device *dev, |
| const struct nlattr *nla) |
| { |
| struct nlattr *tb[IFLA_INET6_MAX + 1]; |
| |
| if (dev && !__in6_dev_get(dev)) |
| return -EAFNOSUPPORT; |
| |
| return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy, |
| NULL); |
| } |
| |
| 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_set_link_af(struct net_device *dev, const struct nlattr *nla) |
| { |
| int err = -EINVAL; |
| struct inet6_dev *idev = __in6_dev_get(dev); |
| struct nlattr *tb[IFLA_INET6_MAX + 1]; |
| |
| if (!idev) |
| return -EAFNOSUPPORT; |
| |
| if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) |
| BUG(); |
| |
| if (tb[IFLA_INET6_TOKEN]) { |
| err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); |
| if (err) |
| return err; |
| } |
| |
| if (tb[IFLA_INET6_ADDR_GEN_MODE]) { |
| u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); |
| |
| if (check_addr_gen_mode(mode) < 0 || |
| check_stable_privacy(idev, dev_net(dev), mode) < 0) |
| return -EINVAL; |
| |
| idev->cnf.addr_gen_mode = mode; |
| err = 0; |
| } |
| |
| return err; |
| } |
| |
| static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, |
| u32 portid, u32 seq, int event, unsigned int flags) |
| { |
| struct net_device *dev = idev->dev; |
| struct ifinfomsg *hdr; |
| struct nlmsghdr *nlh; |
| void *protoinfo; |
| |
| nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); |
| if (!nlh) |
| return -EMSGSIZE; |
| |
| hdr = nlmsg_data(nlh); |
| hdr->ifi_family = AF_INET6; |
| hdr->__ifi_pad = 0; |
| hdr->ifi_type = dev->type; |
| hdr->ifi_index = dev->ifindex; |
| hdr->ifi_flags = dev_get_flags(dev); |
| hdr->ifi_change = 0; |
| |
| if (nla_put_string(skb, IFLA_IFNAME, dev->name) || |
| (dev->addr_len && |
| nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || |
| nla_put_u32(skb, IFLA_MTU, dev->mtu) || |
| (dev->ifindex != dev_get_iflink(dev) && |
| nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || |
| nla_put_u8(skb, IFLA_OPERSTATE, |
| netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) |
| goto nla_put_failure; |
| protoinfo = nla_nest_start(skb, IFLA_PROTINFO); |
| if (!protoinfo) |
| goto nla_put_failure; |
| |
| if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) |
| goto nla_put_failure; |
| |
| nla_nest_end(skb, protoinfo); |
| nlmsg_end(skb, nlh); |
| return 0; |
| |
| nla_put_failure: |
| nlmsg_cancel(skb, nlh); |
| return -EMSGSIZE; |
| } |
| |
| static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| struct net *net = sock_net(skb->sk); |
| int h, s_h; |
| int idx = 0, s_idx; |
| struct net_device *dev; |
| struct inet6_dev *idev; |
| struct hlist_head *head; |
| |
| s_h = cb->args[0]; |
| s_idx = cb->args[1]; |
| |
| rcu_read_lock(); |
| for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { |
| idx = 0; |
| head = &net->dev_index_head[h]; |
| hlist_for_each_entry_rcu(dev, head, index_hlist) { |
| if (idx < s_idx) |
| goto cont; |
| idev = __in6_dev_get(dev); |
| if (!idev) |
| goto cont; |
| if (inet6_fill_ifinfo(skb, idev, |
| NETLINK_CB(cb->skb).portid, |
| cb->nlh->nlmsg_seq, |
| RTM_NEWLINK, NLM_F_MULTI) < 0) |
| goto out; |
| cont: |
| idx++; |
| } |
| } |
| out: |
| rcu_read_unlock(); |
| cb->args[1] = idx; |
| cb->args[0] = h; |
| |
| return skb->len; |
| } |
| |
| void inet6_ifinfo_notify(int event, struct inet6_dev *idev) |
| { |
| struct sk_buff *skb; |
| struct net *net = dev_net(idev->dev); |
| int err = -ENOBUFS; |
| |
| skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); |
| if (!skb) |
| goto errout; |
| |
| err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); |
| if (err < 0) { |
| /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ |
| WARN_ON(err == -EMSGSIZE); |
| kfree_skb(skb); |
| goto errout; |
| } |
| rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); |
| return; |
| errout: |
| if (err < 0) |
| rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); |
| } |
| |
| static inline size_t inet6_prefix_nlmsg_size(void) |
| { |
| return NLMSG_ALIGN(sizeof(struct prefixmsg)) |
| + nla_total_size(sizeof(struct in6_addr)) |
| + nla_total_size(sizeof(struct prefix_cacheinfo)); |
| } |
| |
| static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, |
| struct prefix_info *pinfo, u32 portid, u32 seq, |
| int event, unsigned int flags) |
| { |
| struct prefixmsg *pmsg; |
| struct nlmsghdr *nlh; |
| struct prefix_cacheinfo ci; |
| |
| nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); |
| if (!nlh) |
| return -EMSGSIZE; |
| |
| pmsg = nlmsg_data(nlh); |
| pmsg->prefix_family = AF_INET6; |
| pmsg->prefix_pad1 = 0; |
| pmsg->prefix_pad2 = 0; |
| pmsg->prefix_ifindex = idev->dev->ifindex; |
| pmsg->prefix_len = pinfo->prefix_len; |
| pmsg->prefix_type = pinfo->type; |
| pmsg->prefix_pad3 = 0; |
| pmsg->prefix_flags = 0; |
| if (pinfo->onlink) |
| pmsg->prefix_flags |= IF_PREFIX_ONLINK; |
| if (pinfo->autoconf) |
| pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; |
| |
| if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) |
| goto nla_put_failure; |
| ci.preferred_time = ntohl(pinfo->prefered); |
| ci.valid_time = ntohl(pinfo->valid); |
| if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) |
| goto nla_put_failure; |
| nlmsg_end(skb, nlh); |
| return 0; |
| |
| nla_put_failure: |
| nlmsg_cancel(skb, nlh); |
| return -EMSGSIZE; |
| } |
| |
| static void inet6_prefix_notify(int event, struct inet6_dev *idev, |
| struct prefix_info *pinfo) |
| { |
| struct sk_buff *skb; |
| struct net *net = dev_net(idev->dev); |
| int err = -ENOBUFS; |
| |
| skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); |
| if (!skb) |
| goto errout; |
| |
| err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); |
| if (err < 0) { |
| /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ |
| WARN_ON(err == -EMSGSIZE); |
| kfree_skb(skb); |
| goto errout; |
| } |
| rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); |
| return; |
| errout: |
| if (err < 0) |
| rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); |
| } |
| |
| static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) |
| { |
| struct net *net = dev_net(ifp->idev->dev); |
| |
| if (event) |
| ASSERT_RTNL(); |
| |
| inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); |
| |
| switch (event) { |
| case RTM_NEWADDR: |
| /* |
| * If the address was optimistic |
| * we inserted the route at the start of |
| * our DAD process, so we don't need |
| * to do it again |
| */ |
| if (!(ifp->rt->rt6i_node)) |
| ip6_ins_rt(ifp->rt); |
| if (ifp->idev->cnf.forwarding) |
| addrconf_join_anycast(ifp); |
| if (!ipv6_addr_any(&ifp->peer_addr)) |
| addrconf_prefix_route(&ifp->peer_addr, 128, |
| ifp->idev->dev, 0, 0); |
| break; |
| case RTM_DELADDR: |
| if (ifp->idev->cnf.forwarding) |
| addrconf_leave_anycast(ifp); |
| addrconf_leave_solict(ifp->idev, &ifp->addr); |
| if (!ipv6_addr_any(&ifp->peer_addr)) { |
| struct rt6_info *rt; |
| |
| rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, |
| ifp->idev->dev, 0, 0); |
| if (rt) |
| ip6_del_rt(rt); |
| } |
| if (ifp->rt) { |
| dst_hold(&ifp->rt->dst); |
| ip6_del_rt(ifp->rt); |
| } |
| rt_genid_bump_ipv6(net); |
| break; |
| } |
| atomic_inc(&net->ipv6.dev_addr_genid); |
| } |
| |
| static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) |
| { |
| rcu_read_lock_bh(); |
| if (likely(ifp->idev->dead == 0)) |
| __ipv6_ifa_notify(event, ifp); |
| rcu_read_unlock_bh(); |
| } |
| |
| #ifdef CONFIG_SYSCTL |
| |
| static |
| int addrconf_sysctl_forward(struct ctl_table *ctl, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| int *valp = ctl->data; |
| int val = *valp; |
| loff_t pos = *ppos; |
| struct ctl_table lctl; |
| int ret; |
| |
| /* |
| * ctl->data points to idev->cnf.forwarding, we should |
| * not modify it until we get the rtnl lock. |
| */ |
| lctl = *ctl; |
| lctl.data = &val; |
| |
| ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); |
| |
| if (write) |
| ret = addrconf_fixup_forwarding(ctl, valp, val); |
| if (ret) |
| *ppos = pos; |
| return ret; |
| } |
| |
| static |
| int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| struct inet6_dev *idev = ctl->extra1; |
| int min_mtu = IPV6_MIN_MTU; |
| struct ctl_table lctl; |
| |
| lctl = *ctl; |
| lctl.extra1 = &min_mtu; |
| lctl.extra2 = idev ? &idev->dev->mtu : NULL; |
| |
| return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); |
| } |
| |
| static void dev_disable_change(struct inet6_dev *idev) |
| { |
| struct netdev_notifier_info info; |
| |
| if (!idev || !idev->dev) |
| return; |
| |
| netdev_notifier_info_init(&info, idev->dev); |
| if (idev->cnf.disable_ipv6) |
| addrconf_notify(NULL, NETDEV_DOWN, &info); |
| else |
| addrconf_notify(NULL, NETDEV_UP, &info); |
| } |
| |
| static void addrconf_disable_change(struct net *net, __s32 newf) |
| { |
| struct net_device *dev; |
| struct inet6_dev *idev; |
| |
| 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 __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| int *valp = ctl->data; |
| int val = *valp; |
| loff_t pos = *ppos; |
| struct ctl_table lctl; |
| int ret; |
| |
| /* |
| * ctl->data points to idev->cnf.disable_ipv6, we should |
| * not modify it until we get the rtnl lock. |
| */ |
| lctl = *ctl; |
| lctl.data = &val; |
| |
| ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); |
| |
| if (write) |
| ret = addrconf_disable_ipv6(ctl, valp, val); |
| if (ret) |
| *ppos = pos; |
| return ret; |
| } |
| |
| static |
| int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| int *valp = ctl->data; |
| int ret; |
| int old, new; |
| |
| old = *valp; |
| ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
| new = *valp; |
| |
| if (write && old != new) { |
| struct net *net = ctl->extra2; |
| |
| if (!rtnl_trylock()) |
| return restart_syscall(); |
| |
| if (valp == &net->ipv6.devconf_dflt->proxy_ndp) |
| inet6_netconf_notify_devconf(net, 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 __user *buffer, size_t *lenp, |
| loff_t *ppos) |
| { |
| int ret = 0; |
| int new_val; |
| struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; |
| struct net *net = (struct net *)ctl->extra2; |
| |
| if (!rtnl_trylock()) |
| return restart_syscall(); |
| |
| ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
| |
| if (write) { |
| new_val = *((int *)ctl->data); |
| |
| if (check_addr_gen_mode(new_val) < 0) { |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| /* request for default */ |
| if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) { |
| ipv6_devconf_dflt.addr_gen_mode = new_val; |
| |
| /* request for individual net device */ |
| } else { |
| if (!idev) |
| goto out; |
| |
| 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_dev_config(idev->dev); |
| } |
| } |
| } |
| |
| out: |
| rtnl_unlock(); |
| |
| return ret; |
| } |
| |
| static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, |
| void __user *buffer, size_t *lenp, |
| loff_t *ppos) |
| { |
| int err; |
| struct in6_addr addr; |
| char str[IPV6_MAX_STRLEN]; |
| struct ctl_table lctl = *ctl; |
| struct net *net = ctl->extra2; |
| struct ipv6_stable_secret *secret = ctl->data; |
| |
| if (&net->ipv6.devconf_all->stable_secret == ctl->data) |
| return -EIO; |
| |
| lctl.maxlen = IPV6_MAX_STRLEN; |
| lctl.data = str; |
| |
| if (!rtnl_trylock()) |
| return restart_syscall(); |
| |
| if (!write && !secret->initialized) { |
| err = -EIO; |
| goto out; |
| } |
| |
| 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 __user *buffer, |
| size_t *lenp, |
| loff_t *ppos) |
| { |
| int *valp = ctl->data; |
| int val = *valp; |
| loff_t pos = *ppos; |
| struct ctl_table lctl; |
| int ret; |
| |
| /* ctl->data points to idev->cnf.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) { |
| struct rt6_info *rt = ifa->rt; |
| struct fib6_table *table = rt->rt6i_table; |
| int cpu; |
| |
| read_lock(&table->tb6_lock); |
| addrconf_set_nopolicy(ifa->rt, val); |
| if (rt->rt6i_pcpu) { |
| for_each_possible_cpu(cpu) { |
| struct rt6_info **rtp; |
| |
| rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu); |
| addrconf_set_nopolicy(*rtp, val); |
| } |
| } |
| read_unlock(&table->tb6_lock); |
| } |
| 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 __user *buffer, size_t *lenp, |
| loff_t *ppos) |
| { |
| int *valp = ctl->data; |
| int val = *valp; |
| loff_t pos = *ppos; |
| struct ctl_table lctl; |
| int ret; |
| |
| 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 one = 1; |
| static const int two_five_five = 255; |
| |
| 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 *)&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 = "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_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, |
| }, |
| { |
| /* 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); |
| 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; |
| |
| all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); |
| if (!all) |
| goto err_alloc_all; |
| |
| dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); |
| if (!dflt) |
| goto err_alloc_dflt; |
| |
| /* these will be inherited by all namespaces */ |
| dflt->autoconf = ipv6_defaults.autoconf; |
| dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; |
| |
| dflt->stable_secret.initialized = false; |
| all->stable_secret.initialized = false; |
| |
| net->ipv6.devconf_all = all; |
| net->ipv6.devconf_dflt = dflt; |
| |
| #ifdef CONFIG_SYSCTL |
| err = __addrconf_sysctl_register(net, "all", NULL, all); |
| if (err < 0) |
| goto err_reg_all; |
| |
| err = __addrconf_sysctl_register(net, "default", NULL, dflt); |
| if (err < 0) |
| goto err_reg_dflt; |
| #endif |
| return 0; |
| |
| #ifdef CONFIG_SYSCTL |
| err_reg_dflt: |
| __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); |
| err_reg_all: |
| kfree(dflt); |
| #endif |
| err_alloc_dflt: |
| kfree(all); |
| err_alloc_all: |
| return err; |
| } |
| |
| static void __net_exit addrconf_exit_net(struct net *net) |
| { |
| #ifdef CONFIG_SYSCTL |
| __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, |
| NETCONFA_IFINDEX_DEFAULT); |
| __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, |
| NETCONFA_IFINDEX_ALL); |
| #endif |
| kfree(net->ipv6.devconf_dflt); |
| kfree(net->ipv6.devconf_all); |
| } |
| |
| static struct pernet_operations addrconf_ops = { |
| .init = addrconf_init_net, |
| .exit = addrconf_exit_net, |
| }; |
| |
| static struct rtnl_af_ops inet6_ops __read_mostly = { |
| .family = AF_INET6, |
| .fill_link_af = inet6_fill_link_af, |
| .get_link_af_size = inet6_get_link_af_size, |
| .validate_link_af = inet6_validate_link_af, |
| .set_link_af = inet6_set_link_af, |
| }; |
| |
| /* |
| * Init / cleanup code |
| */ |
| |
| int __init addrconf_init(void) |
| { |
| struct inet6_dev *idev; |
| int i, err; |
| |
| err = ipv6_addr_label_init(); |
| if (err < 0) { |
| pr_crit("%s: cannot initialize default policy table: %d\n", |
| __func__, err); |
| goto out; |
| } |
| |
| err = register_pernet_subsys(&addrconf_ops); |
| if (err < 0) |
| goto out_addrlabel; |
| |
| addrconf_wq = create_workqueue("ipv6_addrconf"); |
| if (!addrconf_wq) { |
| err = -ENOMEM; |
| goto out_nowq; |
| } |
| |
| /* The addrconf netdev notifier requires that loopback_dev |
| * has it's ipv6 private information allocated and setup |
| * before it can bring up and give link-local addresses |
| * to other devices which are up. |
| * |
| * Unfortunately, loopback_dev is not necessarily the first |
| * entry in the global dev_base list of net devices. In fact, |
| * it is likely to be the very last entry on that list. |
| * So this causes the notifier registry below to try and |
| * give link-local addresses to all devices besides loopback_dev |
| * first, then loopback_dev, which cases all the non-loopback_dev |
| * devices to fail to get a link-local address. |
| * |
| * So, as a temporary fix, allocate the ipv6 structure for |
| * loopback_dev first by hand. |
| * Longer term, all of the dependencies ipv6 has upon the loopback |
| * device and it being up should be removed. |
| */ |
| rtnl_lock(); |
| idev = ipv6_add_dev(init_net.loopback_dev); |
| rtnl_unlock(); |
| if (IS_ERR(idev)) { |
| err = PTR_ERR(idev); |
| goto errlo; |
| } |
| |
| for (i = 0; i < IN6_ADDR_HSIZE; i++) |
| INIT_HLIST_HEAD(&inet6_addr_lst[i]); |
| |
| register_netdevice_notifier(&ipv6_dev_notf); |
| |
| addrconf_verify(); |
| |
| rtnl_af_register(&inet6_ops); |
| |
| err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, |
| NULL); |
| if (err < 0) |
| goto errout; |
| |
| /* Only the first call to __rtnl_register can fail */ |
| __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); |
| __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); |
| __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, |
| inet6_dump_ifaddr, NULL); |
| __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, |
| inet6_dump_ifmcaddr, NULL); |
| __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, |
| inet6_dump_ifacaddr, NULL); |
| __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, |
| inet6_netconf_dump_devconf, NULL); |
| |
| ipv6_addr_label_rtnl_register(); |
| |
| return 0; |
| errout: |
| rtnl_af_unregister(&inet6_ops); |
| unregister_netdevice_notifier(&ipv6_dev_notf); |
| errlo: |
| destroy_workqueue(addrconf_wq); |
| out_nowq: |
| unregister_pernet_subsys(&addrconf_ops); |
| out_addrlabel: |
| ipv6_addr_label_cleanup(); |
| out: |
| return err; |
| } |
| |
| void addrconf_cleanup(void) |
| { |
| struct net_device *dev; |
| int i; |
| |
| unregister_netdevice_notifier(&ipv6_dev_notf); |
| unregister_pernet_subsys(&addrconf_ops); |
| ipv6_addr_label_cleanup(); |
| |
| rtnl_lock(); |
| |
| __rtnl_af_unregister(&inet6_ops); |
| |
| /* clean dev list */ |
| for_each_netdev(&init_net, dev) { |
| if (__in6_dev_get(dev) == NULL) |
| continue; |
| addrconf_ifdown(dev, 1); |
| } |
| addrconf_ifdown(init_net.loopback_dev, 2); |
| |
| /* |
| * Check hash table. |
| */ |
| spin_lock_bh(&addrconf_hash_lock); |
| for (i = 0; i < IN6_ADDR_HSIZE; i++) |
| WARN_ON(!hlist_empty(&inet6_addr_lst[i])); |
| spin_unlock_bh(&addrconf_hash_lock); |
| cancel_delayed_work(&addr_chk_work); |
| rtnl_unlock(); |
| |
| destroy_workqueue(addrconf_wq); |
| } |