1 files changed, 81 insertions, 110 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index d6ff12617f36..f62c72b59f8e 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -83,11 +83,7 @@
 #include <linux/if_tunnel.h>
 #include <linux/rtnetlink.h>
 #include <linux/netconf.h>
-
-#ifdef CONFIG_IPV6_PRIVACY
 #include <linux/random.h>
-#endif
-
 #include <linux/uaccess.h>
 #include <asm/unaligned.h>
 
@@ -124,11 +120,9 @@ static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 }
 #endif
 
-#ifdef CONFIG_IPV6_PRIVACY
 static void __ipv6_regen_rndid(struct inet6_dev *idev);
 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 static void ipv6_regen_rndid(unsigned long data);
-#endif
 
 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 static int ipv6_count_addresses(struct inet6_dev *idev);
@@ -183,13 +177,11 @@ static struct ipv6_devconf ipv6_devconf __read_mostly = {
 	.rtr_solicits		= MAX_RTR_SOLICITATIONS,
 	.rtr_solicit_interval	= RTR_SOLICITATION_INTERVAL,
 	.rtr_solicit_delay	= MAX_RTR_SOLICITATION_DELAY,
-#ifdef CONFIG_IPV6_PRIVACY
 	.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,
-#endif
 	.max_addresses		= IPV6_MAX_ADDRESSES,
 	.accept_ra_defrtr	= 1,
 	.accept_ra_pinfo	= 1,
@@ -221,13 +213,11 @@ static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 	.rtr_solicits		= MAX_RTR_SOLICITATIONS,
 	.rtr_solicit_interval	= RTR_SOLICITATION_INTERVAL,
 	.rtr_solicit_delay	= MAX_RTR_SOLICITATION_DELAY,
-#ifdef CONFIG_IPV6_PRIVACY
 	.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,
-#endif
 	.max_addresses		= IPV6_MAX_ADDRESSES,
 	.accept_ra_defrtr	= 1,
 	.accept_ra_pinfo	= 1,
@@ -281,10 +271,24 @@ static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp,
 
 static int snmp6_alloc_dev(struct inet6_dev *idev)
 {
+	int i;
+
 	if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
 			  sizeof(struct ipstats_mib),
 			  __alignof__(struct ipstats_mib)) < 0)
 		goto err_ip;
+
+	for_each_possible_cpu(i) {
+		struct ipstats_mib *addrconf_stats;
+		addrconf_stats = per_cpu_ptr(idev->stats.ipv6[0], i);
+		u64_stats_init(&addrconf_stats->syncp);
+#if SNMP_ARRAY_SZ == 2
+		addrconf_stats = per_cpu_ptr(idev->stats.ipv6[1], i);
+		u64_stats_init(&addrconf_stats->syncp);
+#endif
+	}
+
+
 	idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 					GFP_KERNEL);
 	if (!idev->stats.icmpv6dev)
@@ -371,7 +375,6 @@ static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 	}
 #endif
 
-#ifdef CONFIG_IPV6_PRIVACY
 	INIT_LIST_HEAD(&ndev->tempaddr_list);
 	setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 	if ((dev->flags&IFF_LOOPBACK) ||
@@ -384,7 +387,7 @@ static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 		in6_dev_hold(ndev);
 		ipv6_regen_rndid((unsigned long) ndev);
 	}
-#endif
+
 	ndev->token = in6addr_any;
 
 	if (netif_running(dev) && addrconf_qdisc_ok(dev))
@@ -865,12 +868,10 @@ ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 	/* Add to inet6_dev unicast addr list. */
 	ipv6_link_dev_addr(idev, ifa);
 
-#ifdef CONFIG_IPV6_PRIVACY
 	if (ifa->flags&IFA_F_TEMPORARY) {
 		list_add(&ifa->tmp_list, &idev->tempaddr_list);
 		in6_ifa_hold(ifa);
 	}
-#endif
 
 	in6_ifa_hold(ifa);
 	write_unlock(&idev->lock);
@@ -913,7 +914,7 @@ static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 	spin_unlock_bh(&addrconf_hash_lock);
 
 	write_lock_bh(&idev->lock);
-#ifdef CONFIG_IPV6_PRIVACY
+
 	if (ifp->flags&IFA_F_TEMPORARY) {
 		list_del(&ifp->tmp_list);
 		if (ifp->ifpub) {
@@ -922,7 +923,6 @@ static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 		}
 		__in6_ifa_put(ifp);
 	}
-#endif
 
 	list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
 		if (ifa == ifp) {
@@ -1013,7 +1013,6 @@ out:
 	in6_ifa_put(ifp);
 }
 
-#ifdef CONFIG_IPV6_PRIVACY
 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 {
 	struct inet6_dev *idev = ifp->idev;
@@ -1116,7 +1115,6 @@ retry:
 out:
 	return ret;
 }
-#endif
 
 /*
  *	Choose an appropriate source address (RFC3484)
@@ -1131,9 +1129,7 @@ enum {
 #endif
 	IPV6_SADDR_RULE_OIF,
 	IPV6_SADDR_RULE_LABEL,
-#ifdef CONFIG_IPV6_PRIVACY
 	IPV6_SADDR_RULE_PRIVACY,
-#endif
 	IPV6_SADDR_RULE_ORCHID,
 	IPV6_SADDR_RULE_PREFIX,
 	IPV6_SADDR_RULE_MAX
@@ -1247,7 +1243,6 @@ static int ipv6_get_saddr_eval(struct net *net,
 				      &score->ifa->addr, score->addr_type,
 				      score->ifa->idev->dev->ifindex) == dst->label;
 		break;
-#ifdef CONFIG_IPV6_PRIVACY
 	case IPV6_SADDR_RULE_PRIVACY:
 	    {
 		/* Rule 7: Prefer public address
@@ -1259,7 +1254,6 @@ static int ipv6_get_saddr_eval(struct net *net,
 		ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
 		break;
 	    }
-#endif
 	case IPV6_SADDR_RULE_ORCHID:
 		/* Rule 8-: Prefer ORCHID vs ORCHID or
 		 *	    non-ORCHID vs non-ORCHID
@@ -1499,6 +1493,33 @@ static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 	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;
@@ -1561,7 +1582,6 @@ static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
 		if (dad_failed)
 			ipv6_ifa_notify(0, ifp);
 		in6_ifa_put(ifp);
-#ifdef CONFIG_IPV6_PRIVACY
 	} else if (ifp->flags&IFA_F_TEMPORARY) {
 		struct inet6_ifaddr *ifpub;
 		spin_lock_bh(&ifp->lock);
@@ -1575,7 +1595,6 @@ static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
 			spin_unlock_bh(&ifp->lock);
 		}
 		ipv6_del_addr(ifp);
-#endif
 	} else
 		ipv6_del_addr(ifp);
 }
@@ -1652,7 +1671,7 @@ void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
 {
 	struct in6_addr addr;
-	if (ifp->prefix_len == 127) /* RFC 6164 */
+	if (ifp->prefix_len >= 127) /* RFC 6164 */
 		return;
 	ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
 	if (ipv6_addr_any(&addr))
@@ -1663,7 +1682,7 @@ static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
 {
 	struct in6_addr addr;
-	if (ifp->prefix_len == 127) /* RFC 6164 */
+	if (ifp->prefix_len >= 127) /* RFC 6164 */
 		return;
 	ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
 	if (ipv6_addr_any(&addr))
@@ -1824,7 +1843,6 @@ static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
 	return err;
 }
 
-#ifdef CONFIG_IPV6_PRIVACY
 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
 static void __ipv6_regen_rndid(struct inet6_dev *idev)
 {
@@ -1892,7 +1910,6 @@ static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmp
 	if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
 		__ipv6_regen_rndid(idev);
 }
-#endif
 
 /*
  *	Add prefix route.
@@ -1979,23 +1996,6 @@ static void addrconf_add_mroute(struct net_device *dev)
 	ip6_route_add(&cfg);
 }
 
-#if IS_ENABLED(CONFIG_IPV6_SIT)
-static void sit_route_add(struct net_device *dev)
-{
-	struct fib6_config cfg = {
-		.fc_table = RT6_TABLE_MAIN,
-		.fc_metric = IP6_RT_PRIO_ADDRCONF,
-		.fc_ifindex = dev->ifindex,
-		.fc_dst_len = 96,
-		.fc_flags = RTF_UP | RTF_NONEXTHOP,
-		.fc_nlinfo.nl_net = dev_net(dev),
-	};
-
-	/* prefix length - 96 bits "::d.d.d.d" */
-	ip6_route_add(&cfg);
-}
-#endif
-
 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
 {
 	struct inet6_dev *idev;
@@ -2180,9 +2180,7 @@ ok:
 		if (ifp) {
 			int flags;
 			unsigned long now;
-#ifdef CONFIG_IPV6_PRIVACY
 			struct inet6_ifaddr *ift;
-#endif
 			u32 stored_lft;
 
 			/* update lifetime (RFC2462 5.5.3 e) */
@@ -2193,43 +2191,21 @@ ok:
 			else
 				stored_lft = 0;
 			if (!update_lft && !create && stored_lft) {
-				if (valid_lft > MIN_VALID_LIFETIME ||
-				    valid_lft > stored_lft)
-					update_lft = 1;
-				else if (stored_lft <= MIN_VALID_LIFETIME) {
-					/* valid_lft <= stored_lft is always true */
-					/*
-					 * RFC 4862 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 if the preferred lifetime in
-					 *  this advertisement is different
-					 *  than what we have stored, but the
-					 *  valid lifetime is invalid, just
-					 *  reset prefered_lft.
-					 *
-					 *  We must set the valid lifetime
-					 *  to the stored lifetime since we'll
-					 *  be updating the timestamp below,
-					 *  else we'll set it back to the
-					 *  minimum.
-					 */
-					if (prefered_lft != ifp->prefered_lft) {
-						valid_lft = stored_lft;
-						update_lft = 1;
-					}
-				} else {
-					valid_lft = MIN_VALID_LIFETIME;
-					if (valid_lft < prefered_lft)
-						prefered_lft = valid_lft;
-					update_lft = 1;
-				}
+				const u32 minimum_lft = min(
+					stored_lft, (u32)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) {
@@ -2245,7 +2221,6 @@ ok:
 			} else
 				spin_unlock(&ifp->lock);
 
-#ifdef CONFIG_IPV6_PRIVACY
 			read_lock_bh(&in6_dev->lock);
 			/* update all temporary addresses in the list */
 			list_for_each_entry(ift, &in6_dev->tempaddr_list,
@@ -2310,7 +2285,7 @@ ok:
 			} else {
 				read_unlock_bh(&in6_dev->lock);
 			}
-#endif
+
 			in6_ifa_put(ifp);
 			addrconf_verify(0);
 		}
@@ -2550,7 +2525,8 @@ 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;
+	int scope, plen;
+	u32 pflags = 0;
 
 	ASSERT_RTNL();
 
@@ -2560,12 +2536,16 @@ static void sit_add_v4_addrs(struct inet6_dev *idev)
 	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, 128, scope);
+		add_addr(idev, &addr, plen, scope);
+		addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
 		return;
 	}
 
@@ -2577,7 +2557,6 @@ static void sit_add_v4_addrs(struct inet6_dev *idev)
 			int flag = scope;
 
 			for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
-				int plen;
 
 				addr.s6_addr32[3] = ifa->ifa_local;
 
@@ -2588,12 +2567,10 @@ static void sit_add_v4_addrs(struct inet6_dev *idev)
 						continue;
 					flag |= IFA_HOST;
 				}
-				if (idev->dev->flags&IFF_POINTOPOINT)
-					plen = 64;
-				else
-					plen = 96;
 
 				add_addr(idev, &addr, plen, flag);
+				addrconf_prefix_route(&addr, plen, idev->dev, 0,
+						      pflags);
 			}
 		}
 	}
@@ -2636,7 +2613,7 @@ static void init_loopback(struct net_device *dev)
 			if (sp_ifa->rt)
 				continue;
 
-			sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
+			sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
 
 			/* Failure cases are ignored */
 			if (!IS_ERR(sp_rt)) {
@@ -2719,7 +2696,6 @@ static void addrconf_sit_config(struct net_device *dev)
 		struct in6_addr addr;
 
 		ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
-		addrconf_prefix_route(&addr, 64, dev, 0, 0);
 		if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
 			addrconf_add_linklocal(idev, &addr);
 		return;
@@ -2729,8 +2705,6 @@ static void addrconf_sit_config(struct net_device *dev)
 
 	if (dev->flags&IFF_POINTOPOINT)
 		addrconf_add_mroute(dev);
-	else
-		sit_route_add(dev);
 }
 #endif
 
@@ -2748,8 +2722,6 @@ static void addrconf_gre_config(struct net_device *dev)
 	}
 
 	ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
-	addrconf_prefix_route(&addr, 64, dev, 0, 0);
-
 	if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
 		addrconf_add_linklocal(idev, &addr);
 }
@@ -2990,7 +2962,6 @@ static int addrconf_ifdown(struct net_device *dev, int how)
 	if (!how)
 		idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
 
-#ifdef CONFIG_IPV6_PRIVACY
 	if (how && del_timer(&idev->regen_timer))
 		in6_dev_put(idev);
 
@@ -3010,7 +2981,6 @@ static int addrconf_ifdown(struct net_device *dev, int how)
 		in6_ifa_put(ifa);
 		write_lock_bh(&idev->lock);
 	}
-#endif
 
 	while (!list_empty(&idev->addr_list)) {
 		ifa = list_first_entry(&idev->addr_list,
@@ -3486,7 +3456,12 @@ restart:
 					 &inet6_addr_lst[i], addr_lst) {
 			unsigned long age;
 
-			if (ifp->flags & IFA_F_PERMANENT)
+			/* 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);
@@ -3511,7 +3486,8 @@ restart:
 					ifp->flags |= IFA_F_DEPRECATED;
 				}
 
-				if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
+				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);
@@ -3523,7 +3499,6 @@ restart:
 					in6_ifa_put(ifp);
 					goto restart;
 				}
-#ifdef CONFIG_IPV6_PRIVACY
 			} else if ((ifp->flags&IFA_F_TEMPORARY) &&
 				   !(ifp->flags&IFA_F_TENTATIVE)) {
 				unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
@@ -3551,7 +3526,6 @@ 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);
-#endif
 			} else {
 				/* ifp->prefered_lft <= ifp->valid_lft */
 				if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
@@ -3793,7 +3767,8 @@ static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
 	put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
 		      ifa->idev->dev->ifindex);
 
-	if (!(ifa->flags&IFA_F_PERMANENT)) {
+	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) {
@@ -4123,13 +4098,11 @@ static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
 		jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
 	array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
 		jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
-#ifdef CONFIG_IPV6_PRIVACY
 	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;
-#endif
 	array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
 	array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
 	array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
@@ -4823,7 +4796,6 @@ static struct addrconf_sysctl_table
 			.mode		= 0644,
 			.proc_handler	= proc_dointvec_ms_jiffies,
 		},
-#ifdef CONFIG_IPV6_PRIVACY
 		{
 			.procname	= "use_tempaddr",
 			.data		= &ipv6_devconf.use_tempaddr,
@@ -4859,7 +4831,6 @@ static struct addrconf_sysctl_table
 			.mode		= 0644,
 			.proc_handler	= proc_dointvec,
 		},
-#endif
 		{
 			.procname	= "max_addresses",
 			.data		= &ipv6_devconf.max_addresses,