Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next

Pablo Neira Ayuso says:

====================
Netfilter updates for net-next

The following patchset contains Netfilter/IPVS updates for your net-next tree.
In sum, patches to address fallout from the previous round plus updates from
the IPVS folks via Simon Horman, they are:

1) Add a new scheduler to IPVS: The weighted overflow scheduling algorithm
   directs network connections to the server with the highest weight that is
   currently available and overflows to the next when active connections exceed
   the node's weight. From Raducu Deaconu.

2) Fix locking ordering in IPVS, always take rtnl_lock in first place. Patch
   from Julian Anastasov.

3) Allow to indicate the MTU to the IPVS in-kernel state sync daemon. From
   Julian Anastasov.

4) Enhance multicast configuration for the IPVS state sync daemon. Also from
   Julian.

5) Resolve sparse warnings in the nf_dup modules.

6) Fix a linking problem when CONFIG_NF_DUP_IPV6 is not set.

7) Add ICMP codes 5 and 6 to IPv6 REJECT target, they are more informative
   subsets of code 1. From Andreas Herz.

8) Revert the jumpstack size calculation from mark_source_chains due to chain
   depth miscalculations, from Florian Westphal.

9) Calm down more sparse warning around the Netfilter tree, again from Florian
   Westphal.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

19 files changed, 446 insertions, 195 deletions

diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index 4e3731ee4eac..9b9ca87a4210 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -846,6 +846,17 @@ struct ipvs_master_sync_state {
 /* How much time to keep dests in trash */
 #define IP_VS_DEST_TRASH_PERIOD		(120 * HZ)
 
+struct ipvs_sync_daemon_cfg {
+	union nf_inet_addr	mcast_group;
+	int			syncid;
+	u16			sync_maxlen;
+	u16			mcast_port;
+	u8			mcast_af;
+	u8			mcast_ttl;
+	/* multicast interface name */
+	char			mcast_ifn[IP_VS_IFNAME_MAXLEN];
+};
+
 /* IPVS in network namespace */
 struct netns_ipvs {
 	int			gen;		/* Generation */
@@ -961,15 +972,10 @@ struct netns_ipvs {
 	spinlock_t		sync_buff_lock;
 	struct task_struct	**backup_threads;
 	int			threads_mask;
-	int			send_mesg_maxlen;
-	int			recv_mesg_maxlen;
 	volatile int		sync_state;
-	volatile int		master_syncid;
-	volatile int		backup_syncid;
 	struct mutex		sync_mutex;
-	/* multicast interface name */
-	char			master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
-	char			backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
+	struct ipvs_sync_daemon_cfg	mcfg;	/* Master Configuration */
+	struct ipvs_sync_daemon_cfg	bcfg;	/* Backup Configuration */
 	/* net name space ptr */
 	struct net		*net;            /* Needed by timer routines */
 	/* Number of heterogeneous destinations, needed becaus heterogeneous
@@ -1408,7 +1414,8 @@ static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
 /* IPVS sync daemon data and function prototypes
  * (from ip_vs_sync.c)
  */
-int start_sync_thread(struct net *net, int state, char *mcast_ifn, __u8 syncid);
+int start_sync_thread(struct net *net, struct ipvs_sync_daemon_cfg *cfg,
+		      int state);
 int stop_sync_thread(struct net *net, int state);
 void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp, int pkts);
 
diff --git a/include/uapi/linux/ip_vs.h b/include/uapi/linux/ip_vs.h
index 3199243f2028..391395c06c7e 100644
--- a/include/uapi/linux/ip_vs.h
+++ b/include/uapi/linux/ip_vs.h
@@ -406,6 +406,11 @@ enum {
 	IPVS_DAEMON_ATTR_STATE,		/* sync daemon state (master/backup) */
 	IPVS_DAEMON_ATTR_MCAST_IFN,	/* multicast interface name */
 	IPVS_DAEMON_ATTR_SYNC_ID,	/* SyncID we belong to */
+	IPVS_DAEMON_ATTR_SYNC_MAXLEN,	/* UDP Payload Size */
+	IPVS_DAEMON_ATTR_MCAST_GROUP,	/* IPv4 Multicast Address */
+	IPVS_DAEMON_ATTR_MCAST_GROUP6,	/* IPv6 Multicast Address */
+	IPVS_DAEMON_ATTR_MCAST_PORT,	/* Multicast Port (base) */
+	IPVS_DAEMON_ATTR_MCAST_TTL,	/* Multicast TTL */
 	__IPVS_DAEMON_ATTR_MAX,
 };
 
diff --git a/include/uapi/linux/netfilter_ipv6/ip6t_REJECT.h b/include/uapi/linux/netfilter_ipv6/ip6t_REJECT.h
index 205ed62e4605..cd2e940c8bf5 100644
--- a/include/uapi/linux/netfilter_ipv6/ip6t_REJECT.h
+++ b/include/uapi/linux/netfilter_ipv6/ip6t_REJECT.h
@@ -10,7 +10,9 @@ enum ip6t_reject_with {
 	IP6T_ICMP6_ADDR_UNREACH,
 	IP6T_ICMP6_PORT_UNREACH,
 	IP6T_ICMP6_ECHOREPLY,
-	IP6T_TCP_RESET
+	IP6T_TCP_RESET,
+	IP6T_ICMP6_POLICY_FAIL,
+	IP6T_ICMP6_REJECT_ROUTE
 };
 
 struct ip6t_reject_info {
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 18ca4b24c418..48b6b01295de 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -176,7 +176,7 @@ ebt_basic_match(const struct ebt_entry *e, const struct sk_buff *skb,
 	return 0;
 }
 
-static inline __pure
+static inline
 struct ebt_entry *ebt_next_entry(const struct ebt_entry *entry)
 {
 	return (void *)entry + entry->next_offset;
diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index c416cb355cb0..8f87fc38ccde 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -367,13 +367,10 @@ static inline bool unconditional(const struct arpt_arp *arp)
 
 /* Figures out from what hook each rule can be called: returns 0 if
  * there are loops.  Puts hook bitmask in comefrom.
- *
- * Keeps track of largest call depth seen and stores it in newinfo->stacksize.
  */
-static int mark_source_chains(struct xt_table_info *newinfo,
+static int mark_source_chains(const struct xt_table_info *newinfo,
 			      unsigned int valid_hooks, void *entry0)
 {
-	unsigned int calldepth, max_calldepth = 0;
 	unsigned int hook;
 
 	/* No recursion; use packet counter to save back ptrs (reset
@@ -389,7 +386,6 @@ static int mark_source_chains(struct xt_table_info *newinfo,
 
 		/* Set initial back pointer. */
 		e->counters.pcnt = pos;
-		calldepth = 0;
 
 		for (;;) {
 			const struct xt_standard_target *t
@@ -444,8 +440,6 @@ static int mark_source_chains(struct xt_table_info *newinfo,
 					(entry0 + pos + size);
 				e->counters.pcnt = pos;
 				pos += size;
-				if (calldepth > 0)
-					--calldepth;
 			} else {
 				int newpos = t->verdict;
 
@@ -460,10 +454,6 @@ static int mark_source_chains(struct xt_table_info *newinfo,
 						return 0;
 					}
 
-					if (entry0 + newpos != arpt_next_entry(e) &&
-					    ++calldepth > max_calldepth)
-						max_calldepth = calldepth;
-
 					/* This a jump; chase it. */
 					duprintf("Jump rule %u -> %u\n",
 						 pos, newpos);
@@ -480,7 +470,6 @@ static int mark_source_chains(struct xt_table_info *newinfo,
 		next:
 		duprintf("Finished chain %u\n", hook);
 	}
-	newinfo->stacksize = max_calldepth;
 	return 1;
 }
 
@@ -670,6 +659,9 @@ static int translate_table(struct xt_table_info *newinfo, void *entry0,
 		if (ret != 0)
 			break;
 		++i;
+		if (strcmp(arpt_get_target(iter)->u.user.name,
+		    XT_ERROR_TARGET) == 0)
+			++newinfo->stacksize;
 	}
 	duprintf("translate_table: ARPT_ENTRY_ITERATE gives %d\n", ret);
 	if (ret != 0)
@@ -1442,6 +1434,9 @@ static int translate_compat_table(const char *name,
 			break;
 		}
 		++i;
+		if (strcmp(arpt_get_target(iter1)->u.user.name,
+		    XT_ERROR_TARGET) == 0)
+			++newinfo->stacksize;
 	}
 	if (ret) {
 		/*
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index 787f99ed55e2..b0a86e73451c 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -443,15 +443,11 @@ ipt_do_table(struct sk_buff *skb,
 }
 
 /* Figures out from what hook each rule can be called: returns 0 if
- * there are loops.  Puts hook bitmask in comefrom.
- *
- * Keeps track of largest call depth seen and stores it in newinfo->stacksize.
- */
+   there are loops.  Puts hook bitmask in comefrom. */
 static int
-mark_source_chains(struct xt_table_info *newinfo,
+mark_source_chains(const struct xt_table_info *newinfo,
 		   unsigned int valid_hooks, void *entry0)
 {
-	unsigned int calldepth, max_calldepth = 0;
 	unsigned int hook;
 
 	/* No recursion; use packet counter to save back ptrs (reset
@@ -465,7 +461,6 @@ mark_source_chains(struct xt_table_info *newinfo,
 
 		/* Set initial back pointer. */
 		e->counters.pcnt = pos;
-		calldepth = 0;
 
 		for (;;) {
 			const struct xt_standard_target *t
@@ -527,9 +522,6 @@ mark_source_chains(struct xt_table_info *newinfo,
 					(entry0 + pos + size);
 				e->counters.pcnt = pos;
 				pos += size;
-				WARN_ON_ONCE(calldepth == 0);
-				if (calldepth > 0)
-					--calldepth;
 			} else {
 				int newpos = t->verdict;
 
@@ -543,14 +535,9 @@ mark_source_chains(struct xt_table_info *newinfo,
 								newpos);
 						return 0;
 					}
-					if (entry0 + newpos != ipt_next_entry(e) &&
-					    !(e->ip.flags & IPT_F_GOTO) &&
-					    ++calldepth > max_calldepth)
-						max_calldepth = calldepth;
-
 					/* This a jump; chase it. */
-					duprintf("Jump rule %u -> %u, calldepth %d\n",
-						 pos, newpos, calldepth);
+					duprintf("Jump rule %u -> %u\n",
+						 pos, newpos);
 				} else {
 					/* ... this is a fallthru */
 					newpos = pos + e->next_offset;
@@ -564,7 +551,6 @@ mark_source_chains(struct xt_table_info *newinfo,
 		next:
 		duprintf("Finished chain %u\n", hook);
 	}
-	newinfo->stacksize = max_calldepth;
 	return 1;
 }
 
@@ -844,6 +830,9 @@ translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0,
 		if (ret != 0)
 			return ret;
 		++i;
+		if (strcmp(ipt_get_target(iter)->u.user.name,
+		    XT_ERROR_TARGET) == 0)
+			++newinfo->stacksize;
 	}
 
 	if (i != repl->num_entries) {
@@ -1759,6 +1748,9 @@ translate_compat_table(struct net *net,
 		if (ret != 0)
 			break;
 		++i;
+		if (strcmp(ipt_get_target(iter1)->u.user.name,
+		    XT_ERROR_TARGET) == 0)
+			++newinfo->stacksize;
 	}
 	if (ret) {
 		/*
diff --git a/net/ipv4/netfilter/nft_dup_ipv4.c b/net/ipv4/netfilter/nft_dup_ipv4.c
index 25419fbddcb6..b45932d43b69 100644
--- a/net/ipv4/netfilter/nft_dup_ipv4.c
+++ b/net/ipv4/netfilter/nft_dup_ipv4.c
@@ -26,7 +26,7 @@ static void nft_dup_ipv4_eval(const struct nft_expr *expr,
 {
 	struct nft_dup_ipv4 *priv = nft_expr_priv(expr);
 	struct in_addr gw = {
-		.s_addr = regs->data[priv->sreg_addr],
+		.s_addr = (__force __be32)regs->data[priv->sreg_addr],
 	};
 	int oif = regs->data[priv->sreg_dev];
 
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index 4e21f80228be..0771991ed812 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -455,15 +455,11 @@ ip6t_do_table(struct sk_buff *skb,
 }
 
 /* Figures out from what hook each rule can be called: returns 0 if
- * there are loops.  Puts hook bitmask in comefrom.
- *
- * Keeps track of largest call depth seen and stores it in newinfo->stacksize.
- */
+   there are loops.  Puts hook bitmask in comefrom. */
 static int
-mark_source_chains(struct xt_table_info *newinfo,
+mark_source_chains(const struct xt_table_info *newinfo,
 		   unsigned int valid_hooks, void *entry0)
 {
-	unsigned int calldepth, max_calldepth = 0;
 	unsigned int hook;
 
 	/* No recursion; use packet counter to save back ptrs (reset
@@ -477,7 +473,6 @@ mark_source_chains(struct xt_table_info *newinfo,
 
 		/* Set initial back pointer. */
 		e->counters.pcnt = pos;
-		calldepth = 0;
 
 		for (;;) {
 			const struct xt_standard_target *t
@@ -539,8 +534,6 @@ mark_source_chains(struct xt_table_info *newinfo,
 					(entry0 + pos + size);
 				e->counters.pcnt = pos;
 				pos += size;
-				if (calldepth > 0)
-					--calldepth;
 			} else {
 				int newpos = t->verdict;
 
@@ -554,11 +547,6 @@ mark_source_chains(struct xt_table_info *newinfo,
 								newpos);
 						return 0;
 					}
-					if (entry0 + newpos != ip6t_next_entry(e) &&
-					    !(e->ipv6.flags & IP6T_F_GOTO) &&
-					    ++calldepth > max_calldepth)
-						max_calldepth = calldepth;
-
 					/* This a jump; chase it. */
 					duprintf("Jump rule %u -> %u\n",
 						 pos, newpos);
@@ -575,7 +563,6 @@ mark_source_chains(struct xt_table_info *newinfo,
 		next:
 		duprintf("Finished chain %u\n", hook);
 	}
-	newinfo->stacksize = max_calldepth;
 	return 1;
 }
 
@@ -855,6 +842,9 @@ translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0,
 		if (ret != 0)
 			return ret;
 		++i;
+		if (strcmp(ip6t_get_target(iter)->u.user.name,
+		    XT_ERROR_TARGET) == 0)
+			++newinfo->stacksize;
 	}
 
 	if (i != repl->num_entries) {
@@ -1767,6 +1757,9 @@ translate_compat_table(struct net *net,
 		if (ret != 0)
 			break;
 		++i;
+		if (strcmp(ip6t_get_target(iter1)->u.user.name,
+		    XT_ERROR_TARGET) == 0)
+			++newinfo->stacksize;
 	}
 	if (ret) {
 		/*
diff --git a/net/ipv6/netfilter/ip6t_REJECT.c b/net/ipv6/netfilter/ip6t_REJECT.c
index 567367a75172..0ed841a3fa33 100644
--- a/net/ipv6/netfilter/ip6t_REJECT.c
+++ b/net/ipv6/netfilter/ip6t_REJECT.c
@@ -63,6 +63,12 @@ reject_tg6(struct sk_buff *skb, const struct xt_action_param *par)
 	case IP6T_TCP_RESET:
 		nf_send_reset6(net, skb, par->hooknum);
 		break;
+	case IP6T_ICMP6_POLICY_FAIL:
+		nf_send_unreach6(net, skb, ICMPV6_POLICY_FAIL, par->hooknum);
+		break;
+	case IP6T_ICMP6_REJECT_ROUTE:
+		nf_send_unreach6(net, skb, ICMPV6_REJECT_ROUTE, par->hooknum);
+		break;
 	}
 
 	return NF_DROP;
diff --git a/net/ipv6/netfilter/ip6t_SYNPROXY.c b/net/ipv6/netfilter/ip6t_SYNPROXY.c
index ebbb754c2111..1e4bf99ed16e 100644
--- a/net/ipv6/netfilter/ip6t_SYNPROXY.c
+++ b/net/ipv6/netfilter/ip6t_SYNPROXY.c
@@ -237,7 +237,7 @@ synproxy_send_client_ack(const struct synproxy_net *snet,
 	nth->ack_seq	= th->ack_seq;
 	tcp_flag_word(nth) = TCP_FLAG_ACK;
 	nth->doff	= tcp_hdr_size / 4;
-	nth->window	= ntohs(htons(th->window) >> opts->wscale);
+	nth->window	= htons(ntohs(th->window) >> opts->wscale);
 	nth->check	= 0;
 	nth->urg_ptr	= 0;
 
diff --git a/net/ipv6/netfilter/nf_dup_ipv6.c b/net/ipv6/netfilter/nf_dup_ipv6.c
index d8ab654080b4..c5c87e921ccd 100644
--- a/net/ipv6/netfilter/nf_dup_ipv6.c
+++ b/net/ipv6/netfilter/nf_dup_ipv6.c
@@ -45,8 +45,8 @@ static bool nf_dup_ipv6_route(struct sk_buff *skb, const struct in6_addr *gw,
 		fl6.flowi6_oif = oif;
 
 	fl6.daddr = *gw;
-	fl6.flowlabel = ((iph->flow_lbl[0] & 0xF) << 16) |
-			 (iph->flow_lbl[1] << 8) | iph->flow_lbl[2];
+	fl6.flowlabel = (__force __be32)(((iph->flow_lbl[0] & 0xF) << 16) |
+			(iph->flow_lbl[1] << 8) | iph->flow_lbl[2]);
 	dst = ip6_route_output(net, NULL, &fl6);
 	if (dst->error) {
 		dst_release(dst);
diff --git a/net/netfilter/core.c b/net/netfilter/core.c
index 2a5a0704245c..0b939b7ad724 100644
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c
@@ -388,9 +388,6 @@ EXPORT_SYMBOL(nf_conntrack_destroy);
 struct nfq_ct_hook __rcu *nfq_ct_hook __read_mostly;
 EXPORT_SYMBOL_GPL(nfq_ct_hook);
 
-struct nfq_ct_nat_hook __rcu *nfq_ct_nat_hook __read_mostly;
-EXPORT_SYMBOL_GPL(nfq_ct_nat_hook);
-
 #endif /* CONFIG_NF_CONNTRACK */
 
 #ifdef CONFIG_NF_NAT_NEEDED
diff --git a/net/netfilter/ipvs/Kconfig b/net/netfilter/ipvs/Kconfig
index 3b6929dec748..b32fb0dbe237 100644
--- a/net/netfilter/ipvs/Kconfig
+++ b/net/netfilter/ipvs/Kconfig
@@ -162,6 +162,17 @@ config  IP_VS_FO
 	  If you want to compile it in kernel, say Y. To compile it as a
 	  module, choose M here. If unsure, say N.
 
+config  IP_VS_OVF
+	tristate "weighted overflow scheduling"
+	---help---
+	  The weighted overflow scheduling algorithm directs network
+	  connections to the server with the highest weight that is
+	  currently available and overflows to the next when active
+	  connections exceed the node's weight.
+
+	  If you want to compile it in kernel, say Y. To compile it as a
+	  module, choose M here. If unsure, say N.
+
 config	IP_VS_LBLC
 	tristate "locality-based least-connection scheduling"
 	---help---
diff --git a/net/netfilter/ipvs/Makefile b/net/netfilter/ipvs/Makefile
index 38b2723b2e3d..67f3f4389602 100644
--- a/net/netfilter/ipvs/Makefile
+++ b/net/netfilter/ipvs/Makefile
@@ -27,6 +27,7 @@ obj-$(CONFIG_IP_VS_WRR) += ip_vs_wrr.o
 obj-$(CONFIG_IP_VS_LC) += ip_vs_lc.o
 obj-$(CONFIG_IP_VS_WLC) += ip_vs_wlc.o
 obj-$(CONFIG_IP_VS_FO) += ip_vs_fo.o
+obj-$(CONFIG_IP_VS_OVF) += ip_vs_ovf.o
 obj-$(CONFIG_IP_VS_LBLC) += ip_vs_lblc.o
 obj-$(CONFIG_IP_VS_LBLCR) += ip_vs_lblcr.o
 obj-$(CONFIG_IP_VS_DH) += ip_vs_dh.o
diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index 24c554201a76..1a23e91d50d8 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -2335,13 +2335,23 @@ do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
 	    cmd == IP_VS_SO_SET_STOPDAEMON) {
 		struct ip_vs_daemon_user *dm = (struct ip_vs_daemon_user *)arg;
 
-		mutex_lock(&ipvs->sync_mutex);
-		if (cmd == IP_VS_SO_SET_STARTDAEMON)
-			ret = start_sync_thread(net, dm->state, dm->mcast_ifn,
-						dm->syncid);
-		else
+		if (cmd == IP_VS_SO_SET_STARTDAEMON) {
+			struct ipvs_sync_daemon_cfg cfg;
+
+			memset(&cfg, 0, sizeof(cfg));
+			strlcpy(cfg.mcast_ifn, dm->mcast_ifn,
+				sizeof(cfg.mcast_ifn));
+			cfg.syncid = dm->syncid;
+			rtnl_lock();
+			mutex_lock(&ipvs->sync_mutex);
+			ret = start_sync_thread(net, &cfg, dm->state);
+			mutex_unlock(&ipvs->sync_mutex);
+			rtnl_unlock();
+		} else {
+			mutex_lock(&ipvs->sync_mutex);
 			ret = stop_sync_thread(net, dm->state);
-		mutex_unlock(&ipvs->sync_mutex);
+			mutex_unlock(&ipvs->sync_mutex);
+		}
 		goto out_dec;
 	}
 
@@ -2645,15 +2655,15 @@ do_ip_vs_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
 		mutex_lock(&ipvs->sync_mutex);
 		if (ipvs->sync_state & IP_VS_STATE_MASTER) {
 			d[0].state = IP_VS_STATE_MASTER;
-			strlcpy(d[0].mcast_ifn, ipvs->master_mcast_ifn,
+			strlcpy(d[0].mcast_ifn, ipvs->mcfg.mcast_ifn,
 				sizeof(d[0].mcast_ifn));
-			d[0].syncid = ipvs->master_syncid;
+			d[0].syncid = ipvs->mcfg.syncid;
 		}
 		if (ipvs->sync_state & IP_VS_STATE_BACKUP) {
 			d[1].state = IP_VS_STATE_BACKUP;
-			strlcpy(d[1].mcast_ifn, ipvs->backup_mcast_ifn,
+			strlcpy(d[1].mcast_ifn, ipvs->bcfg.mcast_ifn,
 				sizeof(d[1].mcast_ifn));
-			d[1].syncid = ipvs->backup_syncid;
+			d[1].syncid = ipvs->bcfg.syncid;
 		}
 		if (copy_to_user(user, &d, sizeof(d)) != 0)
 			ret = -EFAULT;
@@ -2808,6 +2818,11 @@ static const struct nla_policy ip_vs_daemon_policy[IPVS_DAEMON_ATTR_MAX + 1] = {
 	[IPVS_DAEMON_ATTR_MCAST_IFN]	= { .type = NLA_NUL_STRING,
 					    .len = IP_VS_IFNAME_MAXLEN },
 	[IPVS_DAEMON_ATTR_SYNC_ID]	= { .type = NLA_U32 },
+	[IPVS_DAEMON_ATTR_SYNC_MAXLEN]	= { .type = NLA_U16 },
+	[IPVS_DAEMON_ATTR_MCAST_GROUP]	= { .type = NLA_U32 },
+	[IPVS_DAEMON_ATTR_MCAST_GROUP6]	= { .len = sizeof(struct in6_addr) },
+	[IPVS_DAEMON_ATTR_MCAST_PORT]	= { .type = NLA_U16 },
+	[IPVS_DAEMON_ATTR_MCAST_TTL]	= { .type = NLA_U8 },
 };
 
 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_SERVICE */
@@ -3266,7 +3281,7 @@ static int ip_vs_genl_parse_dest(struct ip_vs_dest_user_kern *udest,
 }
 
 static int ip_vs_genl_fill_daemon(struct sk_buff *skb, __u32 state,
-				  const char *mcast_ifn, __u32 syncid)
+				  struct ipvs_sync_daemon_cfg *c)
 {
 	struct nlattr *nl_daemon;
 
@@ -3275,9 +3290,23 @@ static int ip_vs_genl_fill_daemon(struct sk_buff *skb, __u32 state,
 		return -EMSGSIZE;
 
 	if (nla_put_u32(skb, IPVS_DAEMON_ATTR_STATE, state) ||
-	    nla_put_string(skb, IPVS_DAEMON_ATTR_MCAST_IFN, mcast_ifn) ||
-	    nla_put_u32(skb, IPVS_DAEMON_ATTR_SYNC_ID, syncid))
+	    nla_put_string(skb, IPVS_DAEMON_ATTR_MCAST_IFN, c->mcast_ifn) ||
+	    nla_put_u32(skb, IPVS_DAEMON_ATTR_SYNC_ID, c->syncid) ||
+	    nla_put_u16(skb, IPVS_DAEMON_ATTR_SYNC_MAXLEN, c->sync_maxlen) ||
+	    nla_put_u16(skb, IPVS_DAEMON_ATTR_MCAST_PORT, c->mcast_port) ||
+	    nla_put_u8(skb, IPVS_DAEMON_ATTR_MCAST_TTL, c->mcast_ttl))
 		goto nla_put_failure;
+#ifdef CONFIG_IP_VS_IPV6
+	if (c->mcast_af == AF_INET6) {
+		if (nla_put_in6_addr(skb, IPVS_DAEMON_ATTR_MCAST_GROUP6,
+				     &c->mcast_group.in6))
+			goto nla_put_failure;
+	} else
+#endif
+		if (c->mcast_af == AF_INET &&
+		    nla_put_in_addr(skb, IPVS_DAEMON_ATTR_MCAST_GROUP,
+				    c->mcast_group.ip))
+			goto nla_put_failure;
 	nla_nest_end(skb, nl_daemon);
 
 	return 0;
@@ -3288,7 +3317,7 @@ nla_put_failure:
 }
 
 static int ip_vs_genl_dump_daemon(struct sk_buff *skb, __u32 state,
-				  const char *mcast_ifn, __u32 syncid,
+				  struct ipvs_sync_daemon_cfg *c,
 				  struct netlink_callback *cb)
 {
 	void *hdr;
@@ -3298,7 +3327,7 @@ static int ip_vs_genl_dump_daemon(struct sk_buff *skb, __u32 state,
 	if (!hdr)
 		return -EMSGSIZE;
 
-	if (ip_vs_genl_fill_daemon(skb, state, mcast_ifn, syncid))
+	if (ip_vs_genl_fill_daemon(skb, state, c))
 		goto nla_put_failure;
 
 	genlmsg_end(skb, hdr);
@@ -3318,8 +3347,7 @@ static int ip_vs_genl_dump_daemons(struct sk_buff *skb,
 	mutex_lock(&ipvs->sync_mutex);
 	if ((ipvs->sync_state & IP_VS_STATE_MASTER) && !cb->args[0]) {
 		if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_MASTER,
-					   ipvs->master_mcast_ifn,
-					   ipvs->master_syncid, cb) < 0)
+					   &ipvs->mcfg, cb) < 0)
 			goto nla_put_failure;
 
 		cb->args[0] = 1;
@@ -3327,8 +3355,7 @@ static int ip_vs_genl_dump_daemons(struct sk_buff *skb,
 
 	if ((ipvs->sync_state & IP_VS_STATE_BACKUP) && !cb->args[1]) {
 		if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_BACKUP,
-					   ipvs->backup_mcast_ifn,
-					   ipvs->backup_syncid, cb) < 0)
+					   &ipvs->bcfg, cb) < 0)
 			goto nla_put_failure;
 
 		cb->args[1] = 1;
@@ -3342,30 +3369,83 @@ nla_put_failure:
 
 static int ip_vs_genl_new_daemon(struct net *net, struct nlattr **attrs)
 {
+	struct netns_ipvs *ipvs = net_ipvs(net);
+	struct ipvs_sync_daemon_cfg c;
+	struct nlattr *a;
+	int ret;
+
+	memset(&c, 0, sizeof(c));
 	if (!(attrs[IPVS_DAEMON_ATTR_STATE] &&
 	      attrs[IPVS_DAEMON_ATTR_MCAST_IFN] &&
 	      attrs[IPVS_DAEMON_ATTR_SYNC_ID]))
 		return -EINVAL;
+	strlcpy(c.mcast_ifn, nla_data(attrs[IPVS_DAEMON_ATTR_MCAST_IFN]),
+		sizeof(c.mcast_ifn));
+	c.syncid = nla_get_u32(attrs[IPVS_DAEMON_ATTR_SYNC_ID]);
+
+	a = attrs[IPVS_DAEMON_ATTR_SYNC_MAXLEN];
+	if (a)
+		c.sync_maxlen = nla_get_u16(a);
+
+	a = attrs[IPVS_DAEMON_ATTR_MCAST_GROUP];
+	if (a) {
+		c.mcast_af = AF_INET;
+		c.mcast_group.ip = nla_get_in_addr(a);
+		if (!ipv4_is_multicast(c.mcast_group.ip))
+			return -EINVAL;
+	} else {
+		a = attrs[IPVS_DAEMON_ATTR_MCAST_GROUP6];
+		if (a) {
+#ifdef CONFIG_IP_VS_IPV6
+			int addr_type;
+
+			c.mcast_af = AF_INET6;
+			c.mcast_group.in6 = nla_get_in6_addr(a);
+			addr_type = ipv6_addr_type(&c.mcast_group.in6);
+			if (!(addr_type & IPV6_ADDR_MULTICAST))
+				return -EINVAL;
+#else
+			return -EAFNOSUPPORT;
+#endif
+		}
+	}
+
+	a = attrs[IPVS_DAEMON_ATTR_MCAST_PORT];
+	if (a)
+		c.mcast_port = nla_get_u16(a);
+
+	a = attrs[IPVS_DAEMON_ATTR_MCAST_TTL];
+	if (a)
+		c.mcast_ttl = nla_get_u8(a);
 
 	/* The synchronization protocol is incompatible with mixed family
 	 * services
 	 */
-	if (net_ipvs(net)->mixed_address_family_dests > 0)
+	if (ipvs->mixed_address_family_dests > 0)
 		return -EINVAL;
 
-	return start_sync_thread(net,
-				 nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]),
-				 nla_data(attrs[IPVS_DAEMON_ATTR_MCAST_IFN]),
-				 nla_get_u32(attrs[IPVS_DAEMON_ATTR_SYNC_ID]));
+	rtnl_lock();
+	mutex_lock(&ipvs->sync_mutex);
+	ret = start_sync_thread(net, &c,
+				nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]));
+	mutex_unlock(&ipvs->sync_mutex);
+	rtnl_unlock();
+	return ret;
 }
 
 static int ip_vs_genl_del_daemon(struct net *net, struct nlattr **attrs)
 {
+	struct netns_ipvs *ipvs = net_ipvs(net);
+	int ret;
+
 	if (!attrs[IPVS_DAEMON_ATTR_STATE])
 		return -EINVAL;
 
-	return stop_sync_thread(net,
-				nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]));
+	mutex_lock(&ipvs->sync_mutex);
+	ret = stop_sync_thread(net,
+			       nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]));
+	mutex_unlock(&ipvs->sync_mutex);
+	return ret;
 }
 
 static int ip_vs_genl_set_config(struct net *net, struct nlattr **attrs)
@@ -3389,7 +3469,7 @@ static int ip_vs_genl_set_config(struct net *net, struct nlattr **attrs)
 
 static int ip_vs_genl_set_daemon(struct sk_buff *skb, struct genl_info *info)
 {
-	int ret = 0, cmd;
+	int ret = -EINVAL, cmd;
 	struct net *net;
 	struct netns_ipvs *ipvs;
 
@@ -3400,22 +3480,19 @@ static int ip_vs_genl_set_daemon(struct sk_buff *skb, struct genl_info *info)
 	if (cmd == IPVS_CMD_NEW_DAEMON || cmd == IPVS_CMD_DEL_DAEMON) {
 		struct nlattr *daemon_attrs[IPVS_DAEMON_ATTR_MAX + 1];
 
-		mutex_lock(&ipvs->sync_mutex);
 		if (!info->attrs[IPVS_CMD_ATTR_DAEMON] ||
 		    nla_parse_nested(daemon_attrs, IPVS_DAEMON_ATTR_MAX,
 				     info->attrs[IPVS_CMD_ATTR_DAEMON],
-				     ip_vs_daemon_policy)) {
-			ret = -EINVAL;
+				     ip_vs_daemon_policy))
 			goto out;
-		}
 
 		if (cmd == IPVS_CMD_NEW_DAEMON)
 			ret = ip_vs_genl_new_daemon(net, daemon_attrs);
 		else
 			ret = ip_vs_genl_del_daemon(net, daemon_attrs);
-out:
-		mutex_unlock(&ipvs->sync_mutex);
 	}
+
+out:
 	return ret;
 }
 
diff --git a/net/netfilter/ipvs/ip_vs_ovf.c b/net/netfilter/ipvs/ip_vs_ovf.c
new file mode 100644
index 000000000000..f7d62c3b7329
--- /dev/null
+++ b/net/netfilter/ipvs/ip_vs_ovf.c
@@ -0,0 +1,86 @@
+/*
+ * IPVS:        Overflow-Connection Scheduling module
+ *
+ * Authors:     Raducu Deaconu <rhadoo_io@yahoo.com>
+ *
+ *              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.
+ *
+ * Scheduler implements "overflow" loadbalancing according to number of active
+ * connections , will keep all conections to the node with the highest weight
+ * and overflow to the next node if the number of connections exceeds the node's
+ * weight.
+ * Note that this scheduler might not be suitable for UDP because it only uses
+ * active connections
+ *
+ */
+
+#define KMSG_COMPONENT "IPVS"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+
+#include <net/ip_vs.h>
+
+/* OVF Connection scheduling  */
+static struct ip_vs_dest *
+ip_vs_ovf_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,
+		   struct ip_vs_iphdr *iph)
+{
+	struct ip_vs_dest *dest, *h = NULL;
+	int hw = 0, w;
+
+	IP_VS_DBG(6, "ip_vs_ovf_schedule(): Scheduling...\n");
+	/* select the node with highest weight, go to next in line if active
+	* connections exceed weight
+	*/
+	list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
+		w = atomic_read(&dest->weight);
+		if ((dest->flags & IP_VS_DEST_F_OVERLOAD) ||
+		    atomic_read(&dest->activeconns) > w ||
+		    w == 0)
+			continue;
+		if (!h || w > hw) {
+			h = dest;
+			hw = w;
+		}
+	}
+
+	if (h) {
+		IP_VS_DBG_BUF(6, "OVF: server %s:%u active %d w %d\n",
+			      IP_VS_DBG_ADDR(h->af, &h->addr),
+			      ntohs(h->port),
+			      atomic_read(&h->activeconns),
+			      atomic_read(&h->weight));
+		return h;
+	}
+
+	ip_vs_scheduler_err(svc, "no destination available");
+	return NULL;
+}
+
+static struct ip_vs_scheduler ip_vs_ovf_scheduler = {
+	.name =			"ovf",
+	.refcnt =		ATOMIC_INIT(0),
+	.module =		THIS_MODULE,
+	.n_list =		LIST_HEAD_INIT(ip_vs_ovf_scheduler.n_list),
+	.schedule =		ip_vs_ovf_schedule,
+};
+
+static int __init ip_vs_ovf_init(void)
+{
+	return register_ip_vs_scheduler(&ip_vs_ovf_scheduler);
+}
+
+static void __exit ip_vs_ovf_cleanup(void)
+{
+	unregister_ip_vs_scheduler(&ip_vs_ovf_scheduler);
+	synchronize_rcu();
+}
+
+module_init(ip_vs_ovf_init);
+module_exit(ip_vs_ovf_cleanup);
+MODULE_LICENSE("GPL");
diff --git a/net/netfilter/ipvs/ip_vs_sync.c b/net/netfilter/ipvs/ip_vs_sync.c
index d99ad93eb855..43f140950075 100644
--- a/net/netfilter/ipvs/ip_vs_sync.c
+++ b/net/netfilter/ipvs/ip_vs_sync.c
@@ -262,6 +262,11 @@ struct ip_vs_sync_mesg {
 	/* ip_vs_sync_conn entries start here */
 };
 
+union ipvs_sockaddr {
+	struct sockaddr_in	in;
+	struct sockaddr_in6	in6;
+};
+
 struct ip_vs_sync_buff {
 	struct list_head        list;
 	unsigned long           firstuse;
@@ -320,26 +325,28 @@ sb_dequeue(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms)
  * Create a new sync buffer for Version 1 proto.
  */
 static inline struct ip_vs_sync_buff *
-ip_vs_sync_buff_create(struct netns_ipvs *ipvs)
+ip_vs_sync_buff_create(struct netns_ipvs *ipvs, unsigned int len)
 {
 	struct ip_vs_sync_buff *sb;
 
 	if (!(sb=kmalloc(sizeof(struct ip_vs_sync_buff), GFP_ATOMIC)))
 		return NULL;
 
-	sb->mesg = kmalloc(ipvs->send_mesg_maxlen, GFP_ATOMIC);
+	len = max_t(unsigned int, len + sizeof(struct ip_vs_sync_mesg),
+		    ipvs->mcfg.sync_maxlen);
+	sb->mesg = kmalloc(len, GFP_ATOMIC);
 	if (!sb->mesg) {
 		kfree(sb);
 		return NULL;
 	}
 	sb->mesg->reserved = 0;  /* old nr_conns i.e. must be zero now */
 	sb->mesg->version = SYNC_PROTO_VER;
-	sb->mesg->syncid = ipvs->master_syncid;
+	sb->mesg->syncid = ipvs->mcfg.syncid;
 	sb->mesg->size = htons(sizeof(struct ip_vs_sync_mesg));
 	sb->mesg->nr_conns = 0;
 	sb->mesg->spare = 0;
 	sb->head = (unsigned char *)sb->mesg + sizeof(struct ip_vs_sync_mesg);
-	sb->end = (unsigned char *)sb->mesg + ipvs->send_mesg_maxlen;
+	sb->end = (unsigned char *)sb->mesg + len;
 
 	sb->firstuse = jiffies;
 	return sb;
@@ -402,7 +409,7 @@ select_master_thread_id(struct netns_ipvs *ipvs, struct ip_vs_conn *cp)
  * Create a new sync buffer for Version 0 proto.
  */
 static inline struct ip_vs_sync_buff *
-ip_vs_sync_buff_create_v0(struct netns_ipvs *ipvs)
+ip_vs_sync_buff_create_v0(struct netns_ipvs *ipvs, unsigned int len)
 {
 	struct ip_vs_sync_buff *sb;
 	struct ip_vs_sync_mesg_v0 *mesg;
@@ -410,17 +417,19 @@ ip_vs_sync_buff_create_v0(struct netns_ipvs *ipvs)
 	if (!(sb=kmalloc(sizeof(struct ip_vs_sync_buff), GFP_ATOMIC)))
 		return NULL;
 
-	sb->mesg = kmalloc(ipvs->send_mesg_maxlen, GFP_ATOMIC);
+	len = max_t(unsigned int, len + sizeof(struct ip_vs_sync_mesg_v0),
+		    ipvs->mcfg.sync_maxlen);
+	sb->mesg = kmalloc(len, GFP_ATOMIC);
 	if (!sb->mesg) {
 		kfree(sb);
 		return NULL;
 	}
 	mesg = (struct ip_vs_sync_mesg_v0 *)sb->mesg;
 	mesg->nr_conns = 0;
-	mesg->syncid = ipvs->master_syncid;
+	mesg->syncid = ipvs->mcfg.syncid;
 	mesg->size = htons(sizeof(struct ip_vs_sync_mesg_v0));
 	sb->head = (unsigned char *)mesg + sizeof(struct ip_vs_sync_mesg_v0);
-	sb->end = (unsigned char *)mesg + ipvs->send_mesg_maxlen;
+	sb->end = (unsigned char *)mesg + len;
 	sb->firstuse = jiffies;
 	return sb;
 }
@@ -533,7 +542,7 @@ static void ip_vs_sync_conn_v0(struct net *net, struct ip_vs_conn *cp,
 	struct ip_vs_sync_buff *buff;
 	struct ipvs_master_sync_state *ms;
 	int id;
-	int len;
+	unsigned int len;
 
 	if (unlikely(cp->af != AF_INET))
 		return;
@@ -553,17 +562,19 @@ static void ip_vs_sync_conn_v0(struct net *net, struct ip_vs_conn *cp,
 	id = select_master_thread_id(ipvs, cp);
 	ms = &ipvs->ms[id];
 	buff = ms->sync_buff;
+	len = (cp->flags & IP_VS_CONN_F_SEQ_MASK) ? FULL_CONN_SIZE :
+		SIMPLE_CONN_SIZE;
 	if (buff) {
 		m = (struct ip_vs_sync_mesg_v0 *) buff->mesg;
 		/* Send buffer if it is for v1 */
-		if (!m->nr_conns) {
+		if (buff->head + len > buff->end || !m->nr_conns) {
 			sb_queue_tail(ipvs, ms);
 			ms->sync_buff = NULL;
 			buff = NULL;
 		}
 	}
 	if (!buff) {
-		buff = ip_vs_sync_buff_create_v0(ipvs);
+		buff = ip_vs_sync_buff_create_v0(ipvs, len);
 		if (!buff) {
 			spin_unlock_bh(&ipvs->sync_buff_lock);
 			pr_err("ip_vs_sync_buff_create failed.\n");
@@ -572,8 +583,6 @@ static void ip_vs_sync_conn_v0(struct net *net, struct ip_vs_conn *cp,
 		ms->sync_buff = buff;
 	}
 
-	len = (cp->flags & IP_VS_CONN_F_SEQ_MASK) ? FULL_CONN_SIZE :
-		SIMPLE_CONN_SIZE;
 	m = (struct ip_vs_sync_mesg_v0 *) buff->mesg;
 	s = (struct ip_vs_sync_conn_v0 *) buff->head;
 
@@ -597,12 +606,6 @@ static void ip_vs_sync_conn_v0(struct net *net, struct ip_vs_conn *cp,
 	m->nr_conns++;
 	m->size = htons(ntohs(m->size) + len);
 	buff->head += len;
-
-	/* check if there is a space for next one */
-	if (buff->head + FULL_CONN_SIZE > buff->end) {
-		sb_queue_tail(ipvs, ms);
-		ms->sync_buff = NULL;
-	}
 	spin_unlock_bh(&ipvs->sync_buff_lock);
 
 	/* synchronize its controller if it has */
@@ -694,7 +697,7 @@ sloop:
 	}
 
 	if (!buff) {
-		buff = ip_vs_sync_buff_create(ipvs);
+		buff = ip_vs_sync_buff_create(ipvs, len);
 		if (!buff) {
 			spin_unlock_bh(&ipvs->sync_buff_lock);
 			pr_err("ip_vs_sync_buff_create failed.\n");
@@ -1219,7 +1222,7 @@ static void ip_vs_process_message(struct net *net, __u8 *buffer,
 		return;
 	}
 	/* SyncID sanity check */
-	if (ipvs->backup_syncid != 0 && m2->syncid != ipvs->backup_syncid) {
+	if (ipvs->bcfg.syncid != 0 && m2->syncid != ipvs->bcfg.syncid) {
 		IP_VS_DBG(7, "BACKUP, Ignoring syncid = %d\n", m2->syncid);
 		return;
 	}
@@ -1303,6 +1306,14 @@ static void set_mcast_loop(struct sock *sk, u_char loop)
 	/* setsockopt(sock, SOL_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)); */
 	lock_sock(sk);
 	inet->mc_loop = loop ? 1 : 0;
+#ifdef CONFIG_IP_VS_IPV6
+	if (sk->sk_family == AF_INET6) {
+		struct ipv6_pinfo *np = inet6_sk(sk);
+
+		/* IPV6_MULTICAST_LOOP */
+		np->mc_loop = loop ? 1 : 0;
+	}
+#endif
 	release_sock(sk);
 }
 
@@ -1316,6 +1327,33 @@ static void set_mcast_ttl(struct sock *sk, u_char ttl)
 	/* setsockopt(sock, SOL_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)); */
 	lock_sock(sk);
 	inet->mc_ttl = ttl;
+#ifdef CONFIG_IP_VS_IPV6
+	if (sk->sk_family == AF_INET6) {
+		struct ipv6_pinfo *np = inet6_sk(sk);
+
+		/* IPV6_MULTICAST_HOPS */
+		np->mcast_hops = ttl;
+	}
+#endif
+	release_sock(sk);
+}
+
+/* Control fragmentation of messages */
+static void set_mcast_pmtudisc(struct sock *sk, int val)
+{
+	struct inet_sock *inet = inet_sk(sk);
+
+	/* setsockopt(sock, SOL_IP, IP_MTU_DISCOVER, &val, sizeof(val)); */
+	lock_sock(sk);
+	inet->pmtudisc = val;
+#ifdef CONFIG_IP_VS_IPV6
+	if (sk->sk_family == AF_INET6) {
+		struct ipv6_pinfo *np = inet6_sk(sk);
+
+		/* IPV6_MTU_DISCOVER */
+		np->pmtudisc = val;
+	}
+#endif
 	release_sock(sk);
 }
 
@@ -1338,44 +1376,15 @@ static int set_mcast_if(struct sock *sk, char *ifname)
 	lock_sock(sk);
 	inet->mc_index = dev->ifindex;
 	/*  inet->mc_addr  = 0; */
-	release_sock(sk);
-
-	return 0;
-}
-
+#ifdef CONFIG_IP_VS_IPV6
+	if (sk->sk_family == AF_INET6) {
+		struct ipv6_pinfo *np = inet6_sk(sk);
 
-/*
- *	Set the maximum length of sync message according to the
- *	specified interface's MTU.
- */
-static int set_sync_mesg_maxlen(struct net *net, int sync_state)
-{
-	struct netns_ipvs *ipvs = net_ipvs(net);
-	struct net_device *dev;
-	int num;
-
-	if (sync_state == IP_VS_STATE_MASTER) {
-		dev = __dev_get_by_name(net, ipvs->master_mcast_ifn);
-		if (!dev)
-			return -ENODEV;
-
-		num = (dev->mtu - sizeof(struct iphdr) -
-		       sizeof(struct udphdr) -
-		       SYNC_MESG_HEADER_LEN - 20) / SIMPLE_CONN_SIZE;
-		ipvs->send_mesg_maxlen = SYNC_MESG_HEADER_LEN +
-			SIMPLE_CONN_SIZE * min(num, MAX_CONNS_PER_SYNCBUFF);
-		IP_VS_DBG(7, "setting the maximum length of sync sending "
-			  "message %d.\n", ipvs->send_mesg_maxlen);
-	} else if (sync_state == IP_VS_STATE_BACKUP) {
-		dev = __dev_get_by_name(net, ipvs->backup_mcast_ifn);
-		if (!dev)
-			return -ENODEV;
-
-		ipvs->recv_mesg_maxlen = dev->mtu -
-			sizeof(struct iphdr) - sizeof(struct udphdr);
-		IP_VS_DBG(7, "setting the maximum length of sync receiving "
-			  "message %d.\n", ipvs->recv_mesg_maxlen);
+		/* IPV6_MULTICAST_IF */
+		np->mcast_oif = dev->ifindex;
 	}
+#endif
+	release_sock(sk);
 
 	return 0;
 }
@@ -1405,15 +1414,34 @@ join_mcast_group(struct sock *sk, struct in_addr *addr, char *ifname)
 
 	mreq.imr_ifindex = dev->ifindex;
 
-	rtnl_lock();
 	lock_sock(sk);
 	ret = ip_mc_join_group(sk, &mreq);
 	release_sock(sk);
-	rtnl_unlock();
 
 	return ret;
 }
 
+#ifdef CONFIG_IP_VS_IPV6
+static int join_mcast_group6(struct sock *sk, struct in6_addr *addr,
+			     char *ifname)
+{
+	struct net *net = sock_net(sk);
+	struct net_device *dev;
+	int ret;
+
+	dev = __dev_get_by_name(net, ifname);
+	if (!dev)
+		return -ENODEV;
+	if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if)
+		return -EINVAL;
+
+	lock_sock(sk);
+	ret = ipv6_sock_mc_join(sk, dev->ifindex, addr);
+	release_sock(sk);
+
+	return ret;
+}
+#endif
 
 static int bind_mcastif_addr(struct socket *sock, char *ifname)
 {
@@ -1442,6 +1470,26 @@ static int bind_mcastif_addr(struct socket *sock, char *ifname)
 	return sock->ops->bind(sock, (struct sockaddr*)&sin, sizeof(sin));
 }
 
+static void get_mcast_sockaddr(union ipvs_sockaddr *sa, int *salen,
+			       struct ipvs_sync_daemon_cfg *c, int id)
+{
+	if (AF_INET6 == c->mcast_af) {
+		sa->in6 = (struct sockaddr_in6) {
+			.sin6_family = AF_INET6,
+			.sin6_port = htons(c->mcast_port + id),
+		};
+		sa->in6.sin6_addr = c->mcast_group.in6;
+		*salen = sizeof(sa->in6);
+	} else {
+		sa->in = (struct sockaddr_in) {
+			.sin_family = AF_INET,
+			.sin_port = htons(c->mcast_port + id),
+		};
+		sa->in.sin_addr = c->mcast_group.in;
+		*salen = sizeof(sa->in);
+	}
+}
+
 /*
  *      Set up sending multicast socket over UDP
  */
@@ -1449,40 +1497,43 @@ static struct socket *make_send_sock(struct net *net, int id)
 {
 	struct netns_ipvs *ipvs = net_ipvs(net);
 	/* multicast addr */
-	struct sockaddr_in mcast_addr = {
-		.sin_family		= AF_INET,
-		.sin_port		= cpu_to_be16(IP_VS_SYNC_PORT + id),
-		.sin_addr.s_addr	= cpu_to_be32(IP_VS_SYNC_GROUP),
-	};
+	union ipvs_sockaddr mcast_addr;
 	struct socket *sock;
-	int result;
+	int result, salen;
 
 	/* First create a socket */
-	result = sock_create_kern(net, PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
+	result = sock_create_kern(net, ipvs->mcfg.mcast_af, SOCK_DGRAM,
+				  IPPROTO_UDP, &sock);
 	if (result < 0) {
 		pr_err("Error during creation of socket; terminating\n");
 		return ERR_PTR(result);
 	}
-	result = set_mcast_if(sock->sk, ipvs->master_mcast_ifn);
+	result = set_mcast_if(sock->sk, ipvs->mcfg.mcast_ifn);
 	if (result < 0) {
 		pr_err("Error setting outbound mcast interface\n");
 		goto error;
 	}
 
 	set_mcast_loop(sock->sk, 0);
-	set_mcast_ttl(sock->sk, 1);
+	set_mcast_ttl(sock->sk, ipvs->mcfg.mcast_ttl);
+	/* Allow fragmentation if MTU changes */
+	set_mcast_pmtudisc(sock->sk, IP_PMTUDISC_DONT);
 	result = sysctl_sync_sock_size(ipvs);
 	if (result > 0)
 		set_sock_size(sock->sk, 1, result);
 
-	result = bind_mcastif_addr(sock, ipvs->master_mcast_ifn);
+	if (AF_INET == ipvs->mcfg.mcast_af)
+		result = bind_mcastif_addr(sock, ipvs->mcfg.mcast_ifn);
+	else
+		result = 0;
 	if (result < 0) {
 		pr_err("Error binding address of the mcast interface\n");
 		goto error;
 	}
 
+	get_mcast_sockaddr(&mcast_addr, &salen, &ipvs->mcfg, id);
 	result = sock->ops->connect(sock, (struct sockaddr *) &mcast_addr,
-			sizeof(struct sockaddr), 0);
+				    salen, 0);
 	if (result < 0) {
 		pr_err("Error connecting to the multicast addr\n");
 		goto error;
@@ -1503,16 +1554,13 @@ static struct socket *make_receive_sock(struct net *net, int id)
 {
 	struct netns_ipvs *ipvs = net_ipvs(net);
 	/* multicast addr */
-	struct sockaddr_in mcast_addr = {
-		.sin_family		= AF_INET,
-		.sin_port		= cpu_to_be16(IP_VS_SYNC_PORT + id),
-		.sin_addr.s_addr	= cpu_to_be32(IP_VS_SYNC_GROUP),
-	};
+	union ipvs_sockaddr mcast_addr;
 	struct socket *sock;
-	int result;
+	int result, salen;
 
 	/* First create a socket */
-	result = sock_create_kern(net, PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
+	result = sock_create_kern(net, ipvs->bcfg.mcast_af, SOCK_DGRAM,
+				  IPPROTO_UDP, &sock);
 	if (result < 0) {
 		pr_err("Error during creation of socket; terminating\n");
 		return ERR_PTR(result);
@@ -1523,17 +1571,22 @@ static struct socket *make_receive_sock(struct net *net, int id)
 	if (result > 0)
 		set_sock_size(sock->sk, 0, result);
 
-	result = sock->ops->bind(sock, (struct sockaddr *) &mcast_addr,
-			sizeof(struct sockaddr));
+	get_mcast_sockaddr(&mcast_addr, &salen, &ipvs->bcfg, id);
+	result = sock->ops->bind(sock, (struct sockaddr *)&mcast_addr, salen);
 	if (result < 0) {
 		pr_err("Error binding to the multicast addr\n");
 		goto error;
 	}
 
 	/* join the multicast group */
-	result = join_mcast_group(sock->sk,
-			(struct in_addr *) &mcast_addr.sin_addr,
-			ipvs->backup_mcast_ifn);
+#ifdef CONFIG_IP_VS_IPV6
+	if (ipvs->bcfg.mcast_af == AF_INET6)
+		result = join_mcast_group6(sock->sk, &mcast_addr.in6.sin6_addr,
+					   ipvs->bcfg.mcast_ifn);
+	else
+#endif
+		result = join_mcast_group(sock->sk, &mcast_addr.in.sin_addr,
+					  ipvs->bcfg.mcast_ifn);
 	if (result < 0) {
 		pr_err("Error joining to the multicast group\n");
 		goto error;
@@ -1641,7 +1694,7 @@ static int sync_thread_master(void *data)
 
 	pr_info("sync thread started: state = MASTER, mcast_ifn = %s, "
 		"syncid = %d, id = %d\n",
-		ipvs->master_mcast_ifn, ipvs->master_syncid, tinfo->id);
+		ipvs->mcfg.mcast_ifn, ipvs->mcfg.syncid, tinfo->id);
 
 	for (;;) {
 		sb = next_sync_buff(ipvs, ms);
@@ -1695,7 +1748,7 @@ static int sync_thread_backup(void *data)
 
 	pr_info("sync thread started: state = BACKUP, mcast_ifn = %s, "
 		"syncid = %d, id = %d\n",
-		ipvs->backup_mcast_ifn, ipvs->backup_syncid, tinfo->id);
+		ipvs->bcfg.mcast_ifn, ipvs->bcfg.syncid, tinfo->id);
 
 	while (!kthread_should_stop()) {
 		wait_event_interruptible(*sk_sleep(tinfo->sock->sk),
@@ -1705,7 +1758,7 @@ static int sync_thread_backup(void *data)
 		/* do we have data now? */
 		while (!skb_queue_empty(&(tinfo->sock->sk->sk_receive_queue))) {
 			len = ip_vs_receive(tinfo->sock, tinfo->buf,
-					ipvs->recv_mesg_maxlen);
+					ipvs->bcfg.sync_maxlen);
 			if (len <= 0) {
 				if (len != -EAGAIN)
 					pr_err("receiving message error\n");
@@ -1725,16 +1778,19 @@ static int sync_thread_backup(void *data)
 }
 
 
-int start_sync_thread(struct net *net, int state, char *mcast_ifn, __u8 syncid)
+int start_sync_thread(struct net *net, struct ipvs_sync_daemon_cfg *c,
+		      int state)
 {
 	struct ip_vs_sync_thread_data *tinfo;
 	struct task_struct **array = NULL, *task;
 	struct socket *sock;
 	struct netns_ipvs *ipvs = net_ipvs(net);
+	struct net_device *dev;
 	char *name;
 	int (*threadfn)(void *data);
-	int id, count;
+	int id, count, hlen;
 	int result = -ENOMEM;
+	u16 mtu, min_mtu;
 
 	IP_VS_DBG(7, "%s(): pid %d\n", __func__, task_pid_nr(current));
 	IP_VS_DBG(7, "Each ip_vs_sync_conn entry needs %Zd bytes\n",
@@ -1746,22 +1802,46 @@ int start_sync_thread(struct net *net, int state, char *mcast_ifn, __u8 syncid)
 	} else
 		count = ipvs->threads_mask + 1;
 
+	if (c->mcast_af == AF_UNSPEC) {
+		c->mcast_af = AF_INET;
+		c->mcast_group.ip = cpu_to_be32(IP_VS_SYNC_GROUP);
+	}
+	if (!c->mcast_port)
+		c->mcast_port = IP_VS_SYNC_PORT;
+	if (!c->mcast_ttl)
+		c->mcast_ttl = 1;
+
+	dev = __dev_get_by_name(net, c->mcast_ifn);
+	if (!dev) {
+		pr_err("Unknown mcast interface: %s\n", c->mcast_ifn);
+		return -ENODEV;
+	}
+	hlen = (AF_INET6 == c->mcast_af) ?
+	       sizeof(struct ipv6hdr) + sizeof(struct udphdr) :
+	       sizeof(struct iphdr) + sizeof(struct udphdr);
+	mtu = (state == IP_VS_STATE_BACKUP) ?
+		  clamp(dev->mtu, 1500U, 65535U) : 1500U;
+	min_mtu = (state == IP_VS_STATE_BACKUP) ? 1024 : 1;
+
+	if (c->sync_maxlen)
+		c->sync_maxlen = clamp_t(unsigned int,
+					 c->sync_maxlen, min_mtu,
+					 65535 - hlen);
+	else
+		c->sync_maxlen = mtu - hlen;
+
 	if (state == IP_VS_STATE_MASTER) {
 		if (ipvs->ms)
 			return -EEXIST;
 
-		strlcpy(ipvs->master_mcast_ifn, mcast_ifn,
-			sizeof(ipvs->master_mcast_ifn));
-		ipvs->master_syncid = syncid;
+		ipvs->mcfg = *c;
 		name = "ipvs-m:%d:%d";
 		threadfn = sync_thread_master;
 	} else if (state == IP_VS_STATE_BACKUP) {
 		if (ipvs->backup_threads)
 			return -EEXIST;
 
-		strlcpy(ipvs->backup_mcast_ifn, mcast_ifn,
-			sizeof(ipvs->backup_mcast_ifn));
-		ipvs->backup_syncid = syncid;
+		ipvs->bcfg = *c;
 		name = "ipvs-b:%d:%d";
 		threadfn = sync_thread_backup;
 	} else {
@@ -1789,7 +1869,6 @@ int start_sync_thread(struct net *net, int state, char *mcast_ifn, __u8 syncid)
 		if (!array)
 			goto out;
 	}
-	set_sync_mesg_maxlen(net, state);
 
 	tinfo = NULL;
 	for (id = 0; id < count; id++) {
@@ -1807,7 +1886,7 @@ int start_sync_thread(struct net *net, int state, char *mcast_ifn, __u8 syncid)
 		tinfo->net = net;
 		tinfo->sock = sock;
 		if (state == IP_VS_STATE_BACKUP) {
-			tinfo->buf = kmalloc(ipvs->recv_mesg_maxlen,
+			tinfo->buf = kmalloc(ipvs->bcfg.sync_maxlen,
 					     GFP_KERNEL);
 			if (!tinfo->buf)
 				goto outtinfo;
diff --git a/net/netfilter/nf_synproxy_core.c b/net/netfilter/nf_synproxy_core.c
index 8fbbdb09826e..888b9558415e 100644
--- a/net/netfilter/nf_synproxy_core.c
+++ b/net/netfilter/nf_synproxy_core.c
@@ -188,7 +188,7 @@ unsigned int synproxy_tstamp_adjust(struct sk_buff *skb,
 				    const struct nf_conn_synproxy *synproxy)
 {
 	unsigned int optoff, optend;
-	u32 *ptr, old;
+	__be32 *ptr, old;
 
 	if (synproxy->tsoff == 0)
 		return 1;
@@ -216,12 +216,12 @@ unsigned int synproxy_tstamp_adjust(struct sk_buff *skb,
 			if (op[0] == TCPOPT_TIMESTAMP &&
 			    op[1] == TCPOLEN_TIMESTAMP) {
 				if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY) {
-					ptr = (u32 *)&op[2];
+					ptr = (__be32 *)&op[2];
 					old = *ptr;
 					*ptr = htonl(ntohl(*ptr) -
 						     synproxy->tsoff);
 				} else {
-					ptr = (u32 *)&op[6];
+					ptr = (__be32 *)&op[6];
 					old = *ptr;
 					*ptr = htonl(ntohl(*ptr) +
 						     synproxy->tsoff);
diff --git a/net/netfilter/xt_TEE.c b/net/netfilter/xt_TEE.c
index 49fee6aa2c0a..fd980aa7715d 100644
--- a/net/netfilter/xt_TEE.c
+++ b/net/netfilter/xt_TEE.c
@@ -37,7 +37,7 @@ tee_tg4(struct sk_buff *skb, const struct xt_action_param *par)
 	return XT_CONTINUE;
 }
 
-#if IS_ENABLED(CONFIG_IPV6)
+#if IS_ENABLED(CONFIG_NF_DUP_IPV6)
 static unsigned int
 tee_tg6(struct sk_buff *skb, const struct xt_action_param *par)
 {
@@ -129,7 +129,7 @@ static struct xt_target tee_tg_reg[] __read_mostly = {
 		.destroy    = tee_tg_destroy,
 		.me         = THIS_MODULE,
 	},
-#if IS_ENABLED(CONFIG_IPV6)
+#if IS_ENABLED(CONFIG_NF_DUP_IPV6)
 	{
 		.name       = "TEE",
 		.revision   = 1,