Linux-libre 4.3.2-gnu

13 files changed, 263 insertions, 36 deletions

diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig
index b552cf0d6..f6a024e14 100644
--- a/net/ipv6/netfilter/Kconfig
+++ b/net/ipv6/netfilter/Kconfig
@@ -47,9 +47,22 @@ config NFT_REJECT_IPV6
 	default NFT_REJECT
 	tristate
 
+config NFT_DUP_IPV6
+	tristate "IPv6 nf_tables packet duplication support"
+	select NF_DUP_IPV6
+	help
+	  This module enables IPv6 packet duplication support for nf_tables.
+
 endif # NF_TABLES_IPV6
 endif # NF_TABLES
 
+config NF_DUP_IPV6
+	tristate "Netfilter IPv6 packet duplication to alternate destination"
+	depends on !NF_CONNTRACK || NF_CONNTRACK
+	help
+	  This option enables the nf_dup_ipv6 core, which duplicates an IPv6
+	  packet to be rerouted to another destination.
+
 config NF_REJECT_IPV6
 	tristate "IPv6 packet rejection"
 	default m if NETFILTER_ADVANCED=n
diff --git a/net/ipv6/netfilter/Makefile b/net/ipv6/netfilter/Makefile
index c36e0a549..b4f7d0b4e 100644
--- a/net/ipv6/netfilter/Makefile
+++ b/net/ipv6/netfilter/Makefile
@@ -30,6 +30,8 @@ obj-$(CONFIG_NF_LOG_IPV6) += nf_log_ipv6.o
 # reject
 obj-$(CONFIG_NF_REJECT_IPV6) += nf_reject_ipv6.o
 
+obj-$(CONFIG_NF_DUP_IPV6) += nf_dup_ipv6.o
+
 # nf_tables
 obj-$(CONFIG_NF_TABLES_IPV6) += nf_tables_ipv6.o
 obj-$(CONFIG_NFT_CHAIN_ROUTE_IPV6) += nft_chain_route_ipv6.o
@@ -37,6 +39,7 @@ obj-$(CONFIG_NFT_CHAIN_NAT_IPV6) += nft_chain_nat_ipv6.o
 obj-$(CONFIG_NFT_REJECT_IPV6) += nft_reject_ipv6.o
 obj-$(CONFIG_NFT_MASQ_IPV6) += nft_masq_ipv6.o
 obj-$(CONFIG_NFT_REDIR_IPV6) += nft_redir_ipv6.o
+obj-$(CONFIG_NFT_DUP_IPV6) += nft_dup_ipv6.o
 
 # matches
 obj-$(CONFIG_IP6_NF_MATCH_AH) += ip6t_ah.o
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index 3c35ced39..0771991ed 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -305,7 +305,7 @@ static void trace_packet(const struct sk_buff *skb,
 }
 #endif
 
-static inline __pure struct ip6t_entry *
+static inline struct ip6t_entry *
 ip6t_next_entry(const struct ip6t_entry *entry)
 {
 	return (void *)entry + entry->next_offset;
@@ -324,12 +324,13 @@ ip6t_do_table(struct sk_buff *skb,
 	const char *indev, *outdev;
 	const void *table_base;
 	struct ip6t_entry *e, **jumpstack;
-	unsigned int *stackptr, origptr, cpu;
+	unsigned int stackidx, cpu;
 	const struct xt_table_info *private;
 	struct xt_action_param acpar;
 	unsigned int addend;
 
 	/* Initialization */
+	stackidx = 0;
 	indev = state->in ? state->in->name : nulldevname;
 	outdev = state->out ? state->out->name : nulldevname;
 	/* We handle fragments by dealing with the first fragment as
@@ -357,8 +358,16 @@ ip6t_do_table(struct sk_buff *skb,
 	cpu        = smp_processor_id();
 	table_base = private->entries;
 	jumpstack  = (struct ip6t_entry **)private->jumpstack[cpu];
-	stackptr   = per_cpu_ptr(private->stackptr, cpu);
-	origptr    = *stackptr;
+
+	/* Switch to alternate jumpstack if we're being invoked via TEE.
+	 * TEE issues XT_CONTINUE verdict on original skb so we must not
+	 * clobber the jumpstack.
+	 *
+	 * For recursion via REJECT or SYNPROXY the stack will be clobbered
+	 * but it is no problem since absolute verdict is issued by these.
+	 */
+	if (static_key_false(&xt_tee_enabled))
+		jumpstack += private->stacksize * __this_cpu_read(nf_skb_duplicated);
 
 	e = get_entry(table_base, private->hook_entry[hook]);
 
@@ -406,20 +415,16 @@ ip6t_do_table(struct sk_buff *skb,
 					verdict = (unsigned int)(-v) - 1;
 					break;
 				}
-				if (*stackptr <= origptr)
+				if (stackidx == 0)
 					e = get_entry(table_base,
 					    private->underflow[hook]);
 				else
-					e = ip6t_next_entry(jumpstack[--*stackptr]);
+					e = ip6t_next_entry(jumpstack[--stackidx]);
 				continue;
 			}
 			if (table_base + v != ip6t_next_entry(e) &&
 			    !(e->ipv6.flags & IP6T_F_GOTO)) {
-				if (*stackptr >= private->stacksize) {
-					verdict = NF_DROP;
-					break;
-				}
-				jumpstack[(*stackptr)++] = e;
+				jumpstack[stackidx++] = e;
 			}
 
 			e = get_entry(table_base, v);
@@ -437,8 +442,6 @@ ip6t_do_table(struct sk_buff *skb,
 			break;
 	} while (!acpar.hotdrop);
 
-	*stackptr = origptr;
-
  	xt_write_recseq_end(addend);
  	local_bh_enable();
 
diff --git a/net/ipv6/netfilter/ip6t_REJECT.c b/net/ipv6/netfilter/ip6t_REJECT.c
index 12331efd4..0ed841a3f 100644
--- a/net/ipv6/netfilter/ip6t_REJECT.c
+++ b/net/ipv6/netfilter/ip6t_REJECT.c
@@ -35,14 +35,12 @@ MODULE_AUTHOR("Yasuyuki KOZAKAI <yasuyuki.kozakai@toshiba.co.jp>");
 MODULE_DESCRIPTION("Xtables: packet \"rejection\" target for IPv6");
 MODULE_LICENSE("GPL");
 
-
 static unsigned int
 reject_tg6(struct sk_buff *skb, const struct xt_action_param *par)
 {
 	const struct ip6t_reject_info *reject = par->targinfo;
 	struct net *net = dev_net((par->in != NULL) ? par->in : par->out);
 
-	pr_debug("%s: medium point\n", __func__);
 	switch (reject->with) {
 	case IP6T_ICMP6_NO_ROUTE:
 		nf_send_unreach6(net, skb, ICMPV6_NOROUTE, par->hooknum);
@@ -65,8 +63,11 @@ reject_tg6(struct sk_buff *skb, const struct xt_action_param *par)
 	case IP6T_TCP_RESET:
 		nf_send_reset6(net, skb, par->hooknum);
 		break;
-	default:
-		net_info_ratelimited("case %u not handled yet\n", reject->with);
+	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;
 	}
 
diff --git a/net/ipv6/netfilter/ip6t_SYNPROXY.c b/net/ipv6/netfilter/ip6t_SYNPROXY.c
index ebbb754c2..1e4bf99ed 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_conntrack_l3proto_ipv6.c b/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
index 4ba0c34c6..7302900c3 100644
--- a/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
+++ b/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
@@ -251,7 +251,7 @@ ipv6_getorigdst(struct sock *sk, int optval, void __user *user, int *len)
 	if (*len < 0 || (unsigned int) *len < sizeof(sin6))
 		return -EINVAL;
 
-	h = nf_conntrack_find_get(sock_net(sk), NF_CT_DEFAULT_ZONE, &tuple);
+	h = nf_conntrack_find_get(sock_net(sk), &nf_ct_zone_dflt, &tuple);
 	if (!h) {
 		pr_debug("IP6T_SO_ORIGINAL_DST: Can't find %pI6c/%u-%pI6c/%u.\n",
 			 &tuple.src.u3.ip6, ntohs(tuple.src.u.tcp.port),
diff --git a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
index 90388d606..0e6fae103 100644
--- a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
+++ b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
@@ -150,7 +150,7 @@ icmpv6_error_message(struct net *net, struct nf_conn *tmpl,
 	struct nf_conntrack_tuple intuple, origtuple;
 	const struct nf_conntrack_tuple_hash *h;
 	const struct nf_conntrack_l4proto *inproto;
-	u16 zone = tmpl ? nf_ct_zone(tmpl) : NF_CT_DEFAULT_ZONE;
+	struct nf_conntrack_zone tmp;
 
 	NF_CT_ASSERT(skb->nfct == NULL);
 
@@ -177,7 +177,8 @@ icmpv6_error_message(struct net *net, struct nf_conn *tmpl,
 
 	*ctinfo = IP_CT_RELATED;
 
-	h = nf_conntrack_find_get(net, zone, &intuple);
+	h = nf_conntrack_find_get(net, nf_ct_zone_tmpl(tmpl, skb, &tmp),
+				  &intuple);
 	if (!h) {
 		pr_debug("icmpv6_error: no match\n");
 		return -NF_ACCEPT;
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index 6d0249817..c7196ad1d 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -633,6 +633,7 @@ ret_orig:
 	kfree_skb(clone);
 	return skb;
 }
+EXPORT_SYMBOL_GPL(nf_ct_frag6_gather);
 
 void nf_ct_frag6_consume_orig(struct sk_buff *skb)
 {
@@ -645,6 +646,7 @@ void nf_ct_frag6_consume_orig(struct sk_buff *skb)
 		s = s2;
 	}
 }
+EXPORT_SYMBOL_GPL(nf_ct_frag6_consume_orig);
 
 static int nf_ct_net_init(struct net *net)
 {
diff --git a/net/ipv6/netfilter/nf_defrag_ipv6_hooks.c b/net/ipv6/netfilter/nf_defrag_ipv6_hooks.c
index a45db0b47..6d9c0b3d5 100644
--- a/net/ipv6/netfilter/nf_defrag_ipv6_hooks.c
+++ b/net/ipv6/netfilter/nf_defrag_ipv6_hooks.c
@@ -33,23 +33,22 @@
 static enum ip6_defrag_users nf_ct6_defrag_user(unsigned int hooknum,
 						struct sk_buff *skb)
 {
-	u16 zone = NF_CT_DEFAULT_ZONE;
-
+	u16 zone_id = NF_CT_DEFAULT_ZONE_ID;
 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
-	if (skb->nfct)
-		zone = nf_ct_zone((struct nf_conn *)skb->nfct);
-#endif
+	if (skb->nfct) {
+		enum ip_conntrack_info ctinfo;
+		const struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
 
-#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
-	if (skb->nf_bridge &&
-	    skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)
-		return IP6_DEFRAG_CONNTRACK_BRIDGE_IN + zone;
+		zone_id = nf_ct_zone_id(nf_ct_zone(ct), CTINFO2DIR(ctinfo));
+	}
 #endif
+	if (nf_bridge_in_prerouting(skb))
+		return IP6_DEFRAG_CONNTRACK_BRIDGE_IN + zone_id;
+
 	if (hooknum == NF_INET_PRE_ROUTING)
-		return IP6_DEFRAG_CONNTRACK_IN + zone;
+		return IP6_DEFRAG_CONNTRACK_IN + zone_id;
 	else
-		return IP6_DEFRAG_CONNTRACK_OUT + zone;
-
+		return IP6_DEFRAG_CONNTRACK_OUT + zone_id;
 }
 
 static unsigned int ipv6_defrag(const struct nf_hook_ops *ops,
diff --git a/net/ipv6/netfilter/nf_dup_ipv6.c b/net/ipv6/netfilter/nf_dup_ipv6.c
new file mode 100644
index 000000000..c8ab62655
--- /dev/null
+++ b/net/ipv6/netfilter/nf_dup_ipv6.c
@@ -0,0 +1,97 @@
+/*
+ * (C) 2007 by Sebastian Claßen <sebastian.classen@freenet.ag>
+ * (C) 2007-2010 by Jan Engelhardt <jengelh@medozas.de>
+ *
+ * Extracted from xt_TEE.c
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 or later, as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/percpu.h>
+#include <linux/skbuff.h>
+#include <linux/netfilter.h>
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#include <net/netfilter/ipv6/nf_dup_ipv6.h>
+#if IS_ENABLED(CONFIG_NF_CONNTRACK)
+#include <net/netfilter/nf_conntrack.h>
+#endif
+
+static struct net *pick_net(struct sk_buff *skb)
+{
+#ifdef CONFIG_NET_NS
+	const struct dst_entry *dst;
+
+	if (skb->dev != NULL)
+		return dev_net(skb->dev);
+	dst = skb_dst(skb);
+	if (dst != NULL && dst->dev != NULL)
+		return dev_net(dst->dev);
+#endif
+	return &init_net;
+}
+
+static bool nf_dup_ipv6_route(struct sk_buff *skb, const struct in6_addr *gw,
+			      int oif)
+{
+	const struct ipv6hdr *iph = ipv6_hdr(skb);
+	struct net *net = pick_net(skb);
+	struct dst_entry *dst;
+	struct flowi6 fl6;
+
+	memset(&fl6, 0, sizeof(fl6));
+	if (oif != -1)
+		fl6.flowi6_oif = oif;
+
+	fl6.daddr = *gw;
+	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);
+		return false;
+	}
+	skb_dst_drop(skb);
+	skb_dst_set(skb, dst);
+	skb->dev      = dst->dev;
+	skb->protocol = htons(ETH_P_IPV6);
+
+	return true;
+}
+
+void nf_dup_ipv6(struct sk_buff *skb, unsigned int hooknum,
+		 const struct in6_addr *gw, int oif)
+{
+	if (this_cpu_read(nf_skb_duplicated))
+		return;
+	skb = pskb_copy(skb, GFP_ATOMIC);
+	if (skb == NULL)
+		return;
+
+#if IS_ENABLED(CONFIG_NF_CONNTRACK)
+	nf_conntrack_put(skb->nfct);
+	skb->nfct     = &nf_ct_untracked_get()->ct_general;
+	skb->nfctinfo = IP_CT_NEW;
+	nf_conntrack_get(skb->nfct);
+#endif
+	if (hooknum == NF_INET_PRE_ROUTING ||
+	    hooknum == NF_INET_LOCAL_IN) {
+		struct ipv6hdr *iph = ipv6_hdr(skb);
+		--iph->hop_limit;
+	}
+	if (nf_dup_ipv6_route(skb, gw, oif)) {
+		__this_cpu_write(nf_skb_duplicated, true);
+		ip6_local_out(skb);
+		__this_cpu_write(nf_skb_duplicated, false);
+	} else {
+		kfree_skb(skb);
+	}
+}
+EXPORT_SYMBOL_GPL(nf_dup_ipv6);
+
+MODULE_AUTHOR("Sebastian Claßen <sebastian.classen@freenet.ag>");
+MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>");
+MODULE_DESCRIPTION("nf_dup_ipv6: IPv6 packet duplication");
+MODULE_LICENSE("GPL");
diff --git a/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c b/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c
index e76900e0a..70fbaed49 100644
--- a/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c
+++ b/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c
@@ -124,7 +124,7 @@ static void nf_nat_ipv6_csum_update(struct sk_buff *skb,
 		newip = &t->dst.u3.in6;
 	}
 	inet_proto_csum_replace16(check, skb, oldip->s6_addr32,
-				  newip->s6_addr32, 1);
+				  newip->s6_addr32, true);
 }
 
 static void nf_nat_ipv6_csum_recalc(struct sk_buff *skb,
@@ -155,7 +155,7 @@ static void nf_nat_ipv6_csum_recalc(struct sk_buff *skb,
 		}
 	} else
 		inet_proto_csum_replace2(check, skb,
-					 htons(oldlen), htons(datalen), 1);
+					 htons(oldlen), htons(datalen), true);
 }
 
 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
diff --git a/net/ipv6/netfilter/nf_nat_proto_icmpv6.c b/net/ipv6/netfilter/nf_nat_proto_icmpv6.c
index 2205e8eee..57593b00c 100644
--- a/net/ipv6/netfilter/nf_nat_proto_icmpv6.c
+++ b/net/ipv6/netfilter/nf_nat_proto_icmpv6.c
@@ -73,7 +73,7 @@ icmpv6_manip_pkt(struct sk_buff *skb,
 	    hdr->icmp6_type == ICMPV6_ECHO_REPLY) {
 		inet_proto_csum_replace2(&hdr->icmp6_cksum, skb,
 					 hdr->icmp6_identifier,
-					 tuple->src.u.icmp.id, 0);
+					 tuple->src.u.icmp.id, false);
 		hdr->icmp6_identifier = tuple->src.u.icmp.id;
 	}
 	return true;
diff --git a/net/ipv6/netfilter/nft_dup_ipv6.c b/net/ipv6/netfilter/nft_dup_ipv6.c
new file mode 100644
index 000000000..0eaa4f65f
--- /dev/null
+++ b/net/ipv6/netfilter/nft_dup_ipv6.c
@@ -0,0 +1,108 @@
+/*
+ * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/ipv6/nf_dup_ipv6.h>
+
+struct nft_dup_ipv6 {
+	enum nft_registers	sreg_addr:8;
+	enum nft_registers	sreg_dev:8;
+};
+
+static void nft_dup_ipv6_eval(const struct nft_expr *expr,
+			      struct nft_regs *regs,
+			      const struct nft_pktinfo *pkt)
+{
+	struct nft_dup_ipv6 *priv = nft_expr_priv(expr);
+	struct in6_addr *gw = (struct in6_addr *)&regs->data[priv->sreg_addr];
+	int oif = regs->data[priv->sreg_dev];
+
+	nf_dup_ipv6(pkt->skb, pkt->ops->hooknum, gw, oif);
+}
+
+static int nft_dup_ipv6_init(const struct nft_ctx *ctx,
+			     const struct nft_expr *expr,
+			     const struct nlattr * const tb[])
+{
+	struct nft_dup_ipv6 *priv = nft_expr_priv(expr);
+	int err;
+
+	if (tb[NFTA_DUP_SREG_ADDR] == NULL)
+		return -EINVAL;
+
+	priv->sreg_addr = nft_parse_register(tb[NFTA_DUP_SREG_ADDR]);
+	err = nft_validate_register_load(priv->sreg_addr, sizeof(struct in6_addr));
+	if (err < 0)
+		return err;
+
+	if (tb[NFTA_DUP_SREG_DEV] != NULL) {
+		priv->sreg_dev = nft_parse_register(tb[NFTA_DUP_SREG_DEV]);
+		return nft_validate_register_load(priv->sreg_dev, sizeof(int));
+	}
+	return 0;
+}
+
+static int nft_dup_ipv6_dump(struct sk_buff *skb, const struct nft_expr *expr)
+{
+	struct nft_dup_ipv6 *priv = nft_expr_priv(expr);
+
+	if (nft_dump_register(skb, NFTA_DUP_SREG_ADDR, priv->sreg_addr) ||
+	    nft_dump_register(skb, NFTA_DUP_SREG_DEV, priv->sreg_dev))
+		goto nla_put_failure;
+
+	return 0;
+
+nla_put_failure:
+	return -1;
+}
+
+static struct nft_expr_type nft_dup_ipv6_type;
+static const struct nft_expr_ops nft_dup_ipv6_ops = {
+	.type		= &nft_dup_ipv6_type,
+	.size		= NFT_EXPR_SIZE(sizeof(struct nft_dup_ipv6)),
+	.eval		= nft_dup_ipv6_eval,
+	.init		= nft_dup_ipv6_init,
+	.dump		= nft_dup_ipv6_dump,
+};
+
+static const struct nla_policy nft_dup_ipv6_policy[NFTA_DUP_MAX + 1] = {
+	[NFTA_DUP_SREG_ADDR]	= { .type = NLA_U32 },
+	[NFTA_DUP_SREG_DEV]	= { .type = NLA_U32 },
+};
+
+static struct nft_expr_type nft_dup_ipv6_type __read_mostly = {
+	.family		= NFPROTO_IPV6,
+	.name		= "dup",
+	.ops		= &nft_dup_ipv6_ops,
+	.policy		= nft_dup_ipv6_policy,
+	.maxattr	= NFTA_DUP_MAX,
+	.owner		= THIS_MODULE,
+};
+
+static int __init nft_dup_ipv6_module_init(void)
+{
+	return nft_register_expr(&nft_dup_ipv6_type);
+}
+
+static void __exit nft_dup_ipv6_module_exit(void)
+{
+	nft_unregister_expr(&nft_dup_ipv6_type);
+}
+
+module_init(nft_dup_ipv6_module_init);
+module_exit(nft_dup_ipv6_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
+MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "dup");