1 files changed, 227 insertions, 265 deletions

diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index 490333d47c7..4db3c2a1679 100644
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -14,6 +14,7 @@
 
 #include <linux/module.h>
 #include <linux/random.h>
+#include <linux/slab.h>
 #include <linux/xfrm.h>
 
 #include <net/addrconf.h>
@@ -28,16 +29,16 @@
 #include <net/transp_v6.h>
 #include <net/ip6_checksum.h>
 #include <net/xfrm.h>
+#include <net/secure_seq.h>
 
 #include "dccp.h"
 #include "ipv6.h"
 #include "feat.h"
 
-/* Socket used for sending RSTs and ACKs */
-static struct socket *dccp_v6_ctl_socket;
+/* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */
 
-static struct inet_connection_sock_af_ops dccp_ipv6_mapped;
-static struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
+static const struct inet_connection_sock_af_ops dccp_ipv6_mapped;
+static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
 
 static void dccp_v6_hash(struct sock *sk)
 {
@@ -47,36 +48,29 @@ static void dccp_v6_hash(struct sock *sk)
 			return;
 		}
 		local_bh_disable();
-		__inet6_hash(sk);
+		__inet6_hash(sk, NULL);
 		local_bh_enable();
 	}
 }
 
 /* add pseudo-header to DCCP checksum stored in skb->csum */
 static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
-				      struct in6_addr *saddr,
-				      struct in6_addr *daddr)
+				      const struct in6_addr *saddr,
+				      const struct in6_addr *daddr)
 {
 	return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
 }
 
-static inline void dccp_v6_send_check(struct sock *sk, int unused_value,
-				      struct sk_buff *skb)
+static inline void dccp_v6_send_check(struct sock *sk, struct sk_buff *skb)
 {
 	struct ipv6_pinfo *np = inet6_sk(sk);
 	struct dccp_hdr *dh = dccp_hdr(skb);
 
 	dccp_csum_outgoing(skb);
-	dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &np->daddr);
+	dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &sk->sk_v6_daddr);
 }
 
-static inline __u32 secure_dccpv6_sequence_number(__be32 *saddr, __be32 *daddr,
-						  __be16 sport, __be16 dport   )
-{
-	return secure_tcpv6_sequence_number(saddr, daddr, sport, dport);
-}
-
-static inline __u32 dccp_v6_init_sequence(struct sk_buff *skb)
+static inline __u64 dccp_v6_init_sequence(struct sk_buff *skb)
 {
 	return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
 					     ipv6_hdr(skb)->saddr.s6_addr32,
@@ -86,20 +80,31 @@ static inline __u32 dccp_v6_init_sequence(struct sk_buff *skb)
 }
 
 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
-			int type, int code, int offset, __be32 info)
+			u8 type, u8 code, int offset, __be32 info)
 {
-	struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
+	const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
 	const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
+	struct dccp_sock *dp;
 	struct ipv6_pinfo *np;
 	struct sock *sk;
 	int err;
 	__u64 seq;
+	struct net *net = dev_net(skb->dev);
+
+	if (skb->len < offset + sizeof(*dh) ||
+	    skb->len < offset + __dccp_basic_hdr_len(dh)) {
+		ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
+				   ICMP6_MIB_INERRORS);
+		return;
+	}
 
-	sk = inet6_lookup(&init_net, &dccp_hashinfo, &hdr->daddr, dh->dccph_dport,
+	sk = inet6_lookup(net, &dccp_hashinfo,
+			&hdr->daddr, dh->dccph_dport,
 			&hdr->saddr, dh->dccph_sport, inet6_iif(skb));
 
 	if (sk == NULL) {
-		ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
+		ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
+				   ICMP6_MIB_INERRORS);
 		return;
 	}
 
@@ -110,64 +115,51 @@ static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 
 	bh_lock_sock(sk);
 	if (sock_owned_by_user(sk))
-		NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS);
+		NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
 
 	if (sk->sk_state == DCCP_CLOSED)
 		goto out;
 
+	dp = dccp_sk(sk);
+	seq = dccp_hdr_seq(dh);
+	if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
+	    !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
+		NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
+		goto out;
+	}
+
 	np = inet6_sk(sk);
 
+	if (type == NDISC_REDIRECT) {
+		struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie);
+
+		if (dst)
+			dst->ops->redirect(dst, sk, skb);
+		goto out;
+	}
+
 	if (type == ICMPV6_PKT_TOOBIG) {
 		struct dst_entry *dst = NULL;
 
+		if (!ip6_sk_accept_pmtu(sk))
+			goto out;
+
 		if (sock_owned_by_user(sk))
 			goto out;
 		if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
 			goto out;
 
-		/* icmp should have updated the destination cache entry */
-		dst = __sk_dst_check(sk, np->dst_cookie);
-		if (dst == NULL) {
-			struct inet_sock *inet = inet_sk(sk);
-			struct flowi fl;
-
-			/* BUGGG_FUTURE: Again, it is not clear how
-			   to handle rthdr case. Ignore this complexity
-			   for now.
-			 */
-			memset(&fl, 0, sizeof(fl));
-			fl.proto = IPPROTO_DCCP;
-			ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
-			ipv6_addr_copy(&fl.fl6_src, &np->saddr);
-			fl.oif = sk->sk_bound_dev_if;
-			fl.fl_ip_dport = inet->dport;
-			fl.fl_ip_sport = inet->sport;
-			security_sk_classify_flow(sk, &fl);
-
-			err = ip6_dst_lookup(sk, &dst, &fl);
-			if (err) {
-				sk->sk_err_soft = -err;
-				goto out;
-			}
-
-			err = xfrm_lookup(&dst, &fl, sk, 0);
-			if (err < 0) {
-				sk->sk_err_soft = -err;
-				goto out;
-			}
-		} else
-			dst_hold(dst);
+		dst = inet6_csk_update_pmtu(sk, ntohl(info));
+		if (!dst)
+			goto out;
 
-		if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
+		if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst))
 			dccp_sync_mss(sk, dst_mtu(dst));
-		} /* else let the usual retransmit timer handle it */
-		dst_release(dst);
 		goto out;
 	}
 
 	icmpv6_err_convert(type, code, &err);
 
-	seq = dccp_hdr_seq(dh);
 	/* Might be for an request_sock */
 	switch (sk->sk_state) {
 		struct request_sock *req, **prev;
@@ -185,10 +177,11 @@ static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 		 * ICMPs are not backlogged, hence we cannot get an established
 		 * socket here.
 		 */
-		BUG_TRAP(req->sk == NULL);
+		WARN_ON(req->sk != NULL);
 
-		if (seq != dccp_rsk(req)->dreq_iss) {
-			NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
+		if (!between48(seq, dccp_rsk(req)->dreq_iss,
+				    dccp_rsk(req)->dreq_gss)) {
+			NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
 			goto out;
 		}
 
@@ -224,48 +217,34 @@ out:
 }
 
 
-static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
-				 struct dst_entry *dst)
+static int dccp_v6_send_response(struct sock *sk, struct request_sock *req)
 {
-	struct inet6_request_sock *ireq6 = inet6_rsk(req);
+	struct inet_request_sock *ireq = inet_rsk(req);
 	struct ipv6_pinfo *np = inet6_sk(sk);
 	struct sk_buff *skb;
-	struct ipv6_txoptions *opt = NULL;
-	struct in6_addr *final_p = NULL, final;
-	struct flowi fl;
+	struct in6_addr *final_p, final;
+	struct flowi6 fl6;
 	int err = -1;
+	struct dst_entry *dst;
 
-	memset(&fl, 0, sizeof(fl));
-	fl.proto = IPPROTO_DCCP;
-	ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
-	ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
-	fl.fl6_flowlabel = 0;
-	fl.oif = ireq6->iif;
-	fl.fl_ip_dport = inet_rsk(req)->rmt_port;
-	fl.fl_ip_sport = inet_sk(sk)->sport;
-	security_req_classify_flow(req, &fl);
-
-	if (dst == NULL) {
-		opt = np->opt;
-
-		if (opt != NULL && opt->srcrt != NULL) {
-			const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
-
-			ipv6_addr_copy(&final, &fl.fl6_dst);
-			ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
-			final_p = &final;
-		}
+	memset(&fl6, 0, sizeof(fl6));
+	fl6.flowi6_proto = IPPROTO_DCCP;
+	fl6.daddr = ireq->ir_v6_rmt_addr;
+	fl6.saddr = ireq->ir_v6_loc_addr;
+	fl6.flowlabel = 0;
+	fl6.flowi6_oif = ireq->ir_iif;
+	fl6.fl6_dport = ireq->ir_rmt_port;
+	fl6.fl6_sport = htons(ireq->ir_num);
+	security_req_classify_flow(req, flowi6_to_flowi(&fl6));
 
-		err = ip6_dst_lookup(sk, &dst, &fl);
-		if (err)
-			goto done;
 
-		if (final_p)
-			ipv6_addr_copy(&fl.fl6_dst, final_p);
+	final_p = fl6_update_dst(&fl6, np->opt, &final);
 
-		err = xfrm_lookup(&dst, &fl, sk, 0);
-		if (err < 0)
-			goto done;
+	dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
+	if (IS_ERR(dst)) {
+		err = PTR_ERR(dst);
+		dst = NULL;
+		goto done;
 	}
 
 	skb = dccp_make_response(sk, dst, req);
@@ -273,31 +252,32 @@ static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
 		struct dccp_hdr *dh = dccp_hdr(skb);
 
 		dh->dccph_checksum = dccp_v6_csum_finish(skb,
-							 &ireq6->loc_addr,
-							 &ireq6->rmt_addr);
-		ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
-		err = ip6_xmit(sk, skb, &fl, opt, 0);
+							 &ireq->ir_v6_loc_addr,
+							 &ireq->ir_v6_rmt_addr);
+		fl6.daddr = ireq->ir_v6_rmt_addr;
+		err = ip6_xmit(sk, skb, &fl6, np->opt, np->tclass);
 		err = net_xmit_eval(err);
 	}
 
 done:
-	if (opt != NULL && opt != np->opt)
-		sock_kfree_s(sk, opt, opt->tot_len);
 	dst_release(dst);
 	return err;
 }
 
 static void dccp_v6_reqsk_destructor(struct request_sock *req)
 {
-	if (inet6_rsk(req)->pktopts != NULL)
-		kfree_skb(inet6_rsk(req)->pktopts);
+	dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
+	kfree_skb(inet_rsk(req)->pktopts);
 }
 
 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
 {
-	struct ipv6hdr *rxip6h;
+	const struct ipv6hdr *rxip6h;
 	struct sk_buff *skb;
-	struct flowi fl;
+	struct flowi6 fl6;
+	struct net *net = dev_net(skb_dst(rxskb)->dev);
+	struct sock *ctl_sk = net->dccp.v6_ctl_sk;
+	struct dst_entry *dst;
 
 	if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
 		return;
@@ -305,7 +285,7 @@ static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
 	if (!ipv6_unicast_destination(rxskb))
 		return;
 
-	skb = dccp_ctl_make_reset(dccp_v6_ctl_socket, rxskb);
+	skb = dccp_ctl_make_reset(ctl_sk, rxskb);
 	if (skb == NULL)
 		return;
 
@@ -313,24 +293,24 @@ static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
 	dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
 							    &rxip6h->daddr);
 
-	memset(&fl, 0, sizeof(fl));
-	ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr);
-	ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr);
+	memset(&fl6, 0, sizeof(fl6));
+	fl6.daddr = rxip6h->saddr;
+	fl6.saddr = rxip6h->daddr;
 
-	fl.proto = IPPROTO_DCCP;
-	fl.oif = inet6_iif(rxskb);
-	fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport;
-	fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport;
-	security_skb_classify_flow(rxskb, &fl);
+	fl6.flowi6_proto = IPPROTO_DCCP;
+	fl6.flowi6_oif = inet6_iif(rxskb);
+	fl6.fl6_dport = dccp_hdr(skb)->dccph_dport;
+	fl6.fl6_sport = dccp_hdr(skb)->dccph_sport;
+	security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6));
 
 	/* sk = NULL, but it is safe for now. RST socket required. */
-	if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
-		if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
-			ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
-			DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
-			DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
-			return;
-		}
+	dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL);
+	if (!IS_ERR(dst)) {
+		skb_dst_set(skb, dst);
+		ip6_xmit(ctl_sk, skb, &fl6, NULL, 0);
+		DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
+		DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
+		return;
 	}
 
 	kfree_skb(skb);
@@ -343,6 +323,7 @@ static struct request_sock_ops dccp6_request_sock_ops = {
 	.send_ack	= dccp_reqsk_send_ack,
 	.destructor	= dccp_v6_reqsk_destructor,
 	.send_reset	= dccp_v6_ctl_send_reset,
+	.syn_ack_timeout = dccp_syn_ack_timeout,
 };
 
 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
@@ -360,7 +341,7 @@ static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
 	if (req != NULL)
 		return dccp_check_req(sk, skb, req, prev);
 
-	nsk = __inet6_lookup_established(&init_net, &dccp_hashinfo,
+	nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
 					 &iph->saddr, dh->dccph_sport,
 					 &iph->daddr, ntohs(dh->dccph_dport),
 					 inet6_iif(skb));
@@ -380,7 +361,7 @@ static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 {
 	struct request_sock *req;
 	struct dccp_request_sock *dreq;
-	struct inet6_request_sock *ireq6;
+	struct inet_request_sock *ireq;
 	struct ipv6_pinfo *np = inet6_sk(sk);
 	const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
 	struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
@@ -409,7 +390,8 @@ static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 	if (req == NULL)
 		goto drop;
 
-	dccp_reqsk_init(req, skb);
+	if (dccp_reqsk_init(req, dccp_sk(sk), skb))
+		goto drop_and_free;
 
 	dreq = dccp_rsk(req);
 	if (dccp_parse_options(sk, dreq, skb))
@@ -418,37 +400,37 @@ static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 	if (security_inet_conn_request(sk, skb, req))
 		goto drop_and_free;
 
-	ireq6 = inet6_rsk(req);
-	ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
-	ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
-	ireq6->pktopts	= NULL;
+	ireq = inet_rsk(req);
+	ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr;
+	ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr;
 
 	if (ipv6_opt_accepted(sk, skb) ||
 	    np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
 	    np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
 		atomic_inc(&skb->users);
-		ireq6->pktopts = skb;
+		ireq->pktopts = skb;
 	}
-	ireq6->iif = sk->sk_bound_dev_if;
+	ireq->ir_iif = sk->sk_bound_dev_if;
 
 	/* So that link locals have meaning */
 	if (!sk->sk_bound_dev_if &&
-	    ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
-		ireq6->iif = inet6_iif(skb);
+	    ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL)
+		ireq->ir_iif = inet6_iif(skb);
 
 	/*
 	 * Step 3: Process LISTEN state
 	 *
 	 *   Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
 	 *
-	 *   In fact we defer setting S.GSR, S.SWL, S.SWH to
-	 *   dccp_create_openreq_child.
+	 * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child().
 	 */
 	dreq->dreq_isr	   = dcb->dccpd_seq;
+	dreq->dreq_gsr     = dreq->dreq_isr;
 	dreq->dreq_iss	   = dccp_v6_init_sequence(skb);
+	dreq->dreq_gss     = dreq->dreq_iss;
 	dreq->dreq_service = service;
 
-	if (dccp_v6_send_response(sk, req, NULL))
+	if (dccp_v6_send_response(sk, req))
 		goto drop_and_free;
 
 	inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
@@ -466,13 +448,11 @@ static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
 					      struct request_sock *req,
 					      struct dst_entry *dst)
 {
-	struct inet6_request_sock *ireq6 = inet6_rsk(req);
+	struct inet_request_sock *ireq = inet_rsk(req);
 	struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
 	struct inet_sock *newinet;
-	struct dccp_sock *newdp;
 	struct dccp6_sock *newdp6;
 	struct sock *newsk;
-	struct ipv6_txoptions *opt;
 
 	if (skb->protocol == htons(ETH_P_IP)) {
 		/*
@@ -483,20 +463,17 @@ static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
 			return NULL;
 
 		newdp6 = (struct dccp6_sock *)newsk;
-		newdp = dccp_sk(newsk);
 		newinet = inet_sk(newsk);
 		newinet->pinet6 = &newdp6->inet6;
 		newnp = inet6_sk(newsk);
 
 		memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 
-		ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
-			      newinet->daddr);
+		ipv6_addr_set_v4mapped(newinet->inet_daddr, &newsk->sk_v6_daddr);
 
-		ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
-			      newinet->saddr);
+		ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
 
-		ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
+		newsk->sk_v6_rcv_saddr = newnp->saddr;
 
 		inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
 		newsk->sk_backlog_rcv = dccp_v4_do_rcv;
@@ -520,44 +497,32 @@ static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
 		return newsk;
 	}
 
-	opt = np->opt;
 
 	if (sk_acceptq_is_full(sk))
 		goto out_overflow;
 
 	if (dst == NULL) {
-		struct in6_addr *final_p = NULL, final;
-		struct flowi fl;
-
-		memset(&fl, 0, sizeof(fl));
-		fl.proto = IPPROTO_DCCP;
-		ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
-		if (opt != NULL && opt->srcrt != NULL) {
-			const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
-
-			ipv6_addr_copy(&final, &fl.fl6_dst);
-			ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
-			final_p = &final;
-		}
-		ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
-		fl.oif = sk->sk_bound_dev_if;
-		fl.fl_ip_dport = inet_rsk(req)->rmt_port;
-		fl.fl_ip_sport = inet_sk(sk)->sport;
-		security_sk_classify_flow(sk, &fl);
-
-		if (ip6_dst_lookup(sk, &dst, &fl))
-			goto out;
-
-		if (final_p)
-			ipv6_addr_copy(&fl.fl6_dst, final_p);
-
-		if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
+		struct in6_addr *final_p, final;
+		struct flowi6 fl6;
+
+		memset(&fl6, 0, sizeof(fl6));
+		fl6.flowi6_proto = IPPROTO_DCCP;
+		fl6.daddr = ireq->ir_v6_rmt_addr;
+		final_p = fl6_update_dst(&fl6, np->opt, &final);
+		fl6.saddr = ireq->ir_v6_loc_addr;
+		fl6.flowi6_oif = sk->sk_bound_dev_if;
+		fl6.fl6_dport = ireq->ir_rmt_port;
+		fl6.fl6_sport = htons(ireq->ir_num);
+		security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
+
+		dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
+		if (IS_ERR(dst))
 			goto out;
 	}
 
 	newsk = dccp_create_openreq_child(sk, req, skb);
 	if (newsk == NULL)
-		goto out;
+		goto out_nonewsk;
 
 	/*
 	 * No need to charge this sock to the relevant IPv6 refcnt debug socks
@@ -571,31 +536,30 @@ static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
 	newdp6 = (struct dccp6_sock *)newsk;
 	newinet = inet_sk(newsk);
 	newinet->pinet6 = &newdp6->inet6;
-	newdp = dccp_sk(newsk);
 	newnp = inet6_sk(newsk);
 
 	memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 
-	ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
-	ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
-	ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
-	newsk->sk_bound_dev_if = ireq6->iif;
+	newsk->sk_v6_daddr	= ireq->ir_v6_rmt_addr;
+	newnp->saddr		= ireq->ir_v6_loc_addr;
+	newsk->sk_v6_rcv_saddr	= ireq->ir_v6_loc_addr;
+	newsk->sk_bound_dev_if	= ireq->ir_iif;
 
 	/* Now IPv6 options...
 
 	   First: no IPv4 options.
 	 */
-	newinet->opt = NULL;
+	newinet->inet_opt = NULL;
 
 	/* Clone RX bits */
 	newnp->rxopt.all = np->rxopt.all;
 
 	/* Clone pktoptions received with SYN */
 	newnp->pktoptions = NULL;
-	if (ireq6->pktopts != NULL) {
-		newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
-		kfree_skb(ireq6->pktopts);
-		ireq6->pktopts = NULL;
+	if (ireq->pktopts != NULL) {
+		newnp->pktoptions = skb_clone(ireq->pktopts, GFP_ATOMIC);
+		consume_skb(ireq->pktopts);
+		ireq->pktopts = NULL;
 		if (newnp->pktoptions)
 			skb_set_owner_r(newnp->pktoptions, newsk);
 	}
@@ -609,11 +573,8 @@ static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
 	 * Yes, keeping reference count would be much more clever, but we make
 	 * one more one thing there: reattach optmem to newsk.
 	 */
-	if (opt != NULL) {
-		newnp->opt = ipv6_dup_options(newsk, opt);
-		if (opt != np->opt)
-			sock_kfree_s(sk, opt, opt->tot_len);
-	}
+	if (np->opt != NULL)
+		newnp->opt = ipv6_dup_options(newsk, np->opt);
 
 	inet_csk(newsk)->icsk_ext_hdr_len = 0;
 	if (newnp->opt != NULL)
@@ -622,20 +583,24 @@ static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
 
 	dccp_sync_mss(newsk, dst_mtu(dst));
 
-	newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
+	newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
+	newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
 
-	__inet6_hash(newsk);
-	inet_inherit_port(sk, newsk);
+	if (__inet_inherit_port(sk, newsk) < 0) {
+		inet_csk_prepare_forced_close(newsk);
+		dccp_done(newsk);
+		goto out;
+	}
+	__inet6_hash(newsk, NULL);
 
 	return newsk;
 
 out_overflow:
-	NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
-out:
-	NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
-	if (opt != NULL && opt != np->opt)
-		sock_kfree_s(sk, opt, opt->tot_len);
+	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
+out_nonewsk:
 	dst_release(dst);
+out:
+	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
 	return NULL;
 }
 
@@ -791,10 +756,8 @@ static int dccp_v6_rcv(struct sk_buff *skb)
 
 	/* Step 2:
 	 *	Look up flow ID in table and get corresponding socket */
-	sk = __inet6_lookup(&init_net, &dccp_hashinfo, &ipv6_hdr(skb)->saddr,
-			    dh->dccph_sport,
-			    &ipv6_hdr(skb)->daddr, ntohs(dh->dccph_dport),
-			    inet6_iif(skb));
+	sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
+			        dh->dccph_sport, dh->dccph_dport);
 	/*
 	 * Step 2:
 	 *	If no socket ...
@@ -867,8 +830,8 @@ static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 	struct inet_sock *inet = inet_sk(sk);
 	struct ipv6_pinfo *np = inet6_sk(sk);
 	struct dccp_sock *dp = dccp_sk(sk);
-	struct in6_addr *saddr = NULL, *final_p = NULL, final;
-	struct flowi fl;
+	struct in6_addr *saddr = NULL, *final_p, final;
+	struct flowi6 fl6;
 	struct dst_entry *dst;
 	int addr_type;
 	int err;
@@ -881,17 +844,16 @@ static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 	if (usin->sin6_family != AF_INET6)
 		return -EAFNOSUPPORT;
 
-	memset(&fl, 0, sizeof(fl));
+	memset(&fl6, 0, sizeof(fl6));
 
 	if (np->sndflow) {
-		fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
-		IP6_ECN_flow_init(fl.fl6_flowlabel);
-		if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
+		fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
+		IP6_ECN_flow_init(fl6.flowlabel);
+		if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) {
 			struct ip6_flowlabel *flowlabel;
-			flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
+			flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
 			if (flowlabel == NULL)
 				return -EINVAL;
-			ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
 			fl6_sock_release(flowlabel);
 		}
 	}
@@ -924,8 +886,8 @@ static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 			return -EINVAL;
 	}
 
-	ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
-	np->flow_label = fl.fl6_flowlabel;
+	sk->sk_v6_daddr = usin->sin6_addr;
+	np->flow_label = fl6.flowlabel;
 
 	/*
 	 * DCCP over IPv4
@@ -952,58 +914,40 @@ static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 			icsk->icsk_af_ops = &dccp_ipv6_af_ops;
 			sk->sk_backlog_rcv = dccp_v6_do_rcv;
 			goto failure;
-		} else {
-			ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
-				      inet->saddr);
-			ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
-				      inet->rcv_saddr);
 		}
+		ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
+		ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &sk->sk_v6_rcv_saddr);
 
 		return err;
 	}
 
-	if (!ipv6_addr_any(&np->rcv_saddr))
-		saddr = &np->rcv_saddr;
-
-	fl.proto = IPPROTO_DCCP;
-	ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
-	ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
-	fl.oif = sk->sk_bound_dev_if;
-	fl.fl_ip_dport = usin->sin6_port;
-	fl.fl_ip_sport = inet->sport;
-	security_sk_classify_flow(sk, &fl);
+	if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr))
+		saddr = &sk->sk_v6_rcv_saddr;
 
-	if (np->opt != NULL && np->opt->srcrt != NULL) {
-		const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
+	fl6.flowi6_proto = IPPROTO_DCCP;
+	fl6.daddr = sk->sk_v6_daddr;
+	fl6.saddr = saddr ? *saddr : np->saddr;
+	fl6.flowi6_oif = sk->sk_bound_dev_if;
+	fl6.fl6_dport = usin->sin6_port;
+	fl6.fl6_sport = inet->inet_sport;
+	security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 
-		ipv6_addr_copy(&final, &fl.fl6_dst);
-		ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
-		final_p = &final;
-	}
+	final_p = fl6_update_dst(&fl6, np->opt, &final);
 
-	err = ip6_dst_lookup(sk, &dst, &fl);
-	if (err)
+	dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
+	if (IS_ERR(dst)) {
+		err = PTR_ERR(dst);
 		goto failure;
-
-	if (final_p)
-		ipv6_addr_copy(&fl.fl6_dst, final_p);
-
-	err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT);
-	if (err < 0) {
-		if (err == -EREMOTE)
-			err = ip6_dst_blackhole(sk, &dst, &fl);
-		if (err < 0)
-			goto failure;
 	}
 
 	if (saddr == NULL) {
-		saddr = &fl.fl6_src;
-		ipv6_addr_copy(&np->rcv_saddr, saddr);
+		saddr = &fl6.saddr;
+		sk->sk_v6_rcv_saddr = *saddr;
 	}
 
 	/* set the source address */
-	ipv6_addr_copy(&np->saddr, saddr);
-	inet->rcv_saddr = LOOPBACK4_IPV6;
+	np->saddr = *saddr;
+	inet->inet_rcv_saddr = LOOPBACK4_IPV6;
 
 	__ip6_dst_store(sk, dst, NULL, NULL);
 
@@ -1012,7 +956,7 @@ static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 		icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
 					  np->opt->opt_nflen);
 
-	inet->dport = usin->sin6_port;
+	inet->inet_dport = usin->sin6_port;
 
 	dccp_set_state(sk, DCCP_REQUESTING);
 	err = inet6_hash_connect(&dccp_death_row, sk);
@@ -1020,8 +964,9 @@ static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 		goto late_failure;
 
 	dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
-						      np->daddr.s6_addr32,
-						      inet->sport, inet->dport);
+						      sk->sk_v6_daddr.s6_addr32,
+						      inet->inet_sport,
+						      inet->inet_dport);
 	err = dccp_connect(sk);
 	if (err)
 		goto late_failure;
@@ -1032,12 +977,12 @@ late_failure:
 	dccp_set_state(sk, DCCP_CLOSED);
 	__sk_dst_reset(sk);
 failure:
-	inet->dport = 0;
+	inet->inet_dport = 0;
 	sk->sk_route_caps = 0;
 	return err;
 }
 
-static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
+static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
 	.queue_xmit	   = inet6_csk_xmit,
 	.send_check	   = dccp_v6_send_check,
 	.rebuild_header	   = inet6_sk_rebuild_header,
@@ -1058,7 +1003,7 @@ static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
 /*
  *	DCCP over IPv4 via INET6 API
  */
-static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
+static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
 	.queue_xmit	   = ip_queue_xmit,
 	.send_check	   = dccp_v4_send_check,
 	.rebuild_header	   = inet_sk_rebuild_header,
@@ -1092,18 +1037,16 @@ static int dccp_v6_init_sock(struct sock *sk)
 	return err;
 }
 
-static int dccp_v6_destroy_sock(struct sock *sk)
+static void dccp_v6_destroy_sock(struct sock *sk)
 {
 	dccp_destroy_sock(sk);
-	return inet6_destroy_sock(sk);
+	inet6_destroy_sock(sk);
 }
 
 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
 	.twsk_obj_size	= sizeof(struct dccp6_timewait_sock),
 };
 
-DEFINE_PROTO_INUSE(dccp_v6)
-
 static struct proto dccp_v6_prot = {
 	.name		   = "DCCPv6",
 	.owner		   = THIS_MODULE,
@@ -1126,23 +1069,23 @@ static struct proto dccp_v6_prot = {
 	.orphan_count	   = &dccp_orphan_count,
 	.max_header	   = MAX_DCCP_HEADER,
 	.obj_size	   = sizeof(struct dccp6_sock),
+	.slab_flags	   = SLAB_DESTROY_BY_RCU,
 	.rsk_prot	   = &dccp6_request_sock_ops,
 	.twsk_prot	   = &dccp6_timewait_sock_ops,
-	.hashinfo	   = &dccp_hashinfo,
+	.h.hashinfo	   = &dccp_hashinfo,
 #ifdef CONFIG_COMPAT
 	.compat_setsockopt = compat_dccp_setsockopt,
 	.compat_getsockopt = compat_dccp_getsockopt,
 #endif
-	REF_PROTO_INUSE(dccp_v6)
 };
 
-static struct inet6_protocol dccp_v6_protocol = {
+static const struct inet6_protocol dccp_v6_protocol = {
 	.handler	= dccp_v6_rcv,
 	.err_handler	= dccp_v6_err,
 	.flags		= INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
 };
 
-static struct proto_ops inet6_dccp_ops = {
+static const struct proto_ops inet6_dccp_ops = {
 	.family		   = PF_INET6,
 	.owner		   = THIS_MODULE,
 	.release	   = inet6_release,
@@ -1172,10 +1115,28 @@ static struct inet_protosw dccp_v6_protosw = {
 	.protocol	= IPPROTO_DCCP,
 	.prot		= &dccp_v6_prot,
 	.ops		= &inet6_dccp_ops,
-	.capability	= -1,
 	.flags		= INET_PROTOSW_ICSK,
 };
 
+static int __net_init dccp_v6_init_net(struct net *net)
+{
+	if (dccp_hashinfo.bhash == NULL)
+		return -ESOCKTNOSUPPORT;
+
+	return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
+				    SOCK_DCCP, IPPROTO_DCCP, net);
+}
+
+static void __net_exit dccp_v6_exit_net(struct net *net)
+{
+	inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
+}
+
+static struct pernet_operations dccp_v6_ops = {
+	.init   = dccp_v6_init_net,
+	.exit   = dccp_v6_exit_net,
+};
+
 static int __init dccp_v6_init(void)
 {
 	int err = proto_register(&dccp_v6_prot, 1);
@@ -1189,13 +1150,13 @@ static int __init dccp_v6_init(void)
 
 	inet6_register_protosw(&dccp_v6_protosw);
 
-	err = inet_csk_ctl_sock_create(&dccp_v6_ctl_socket, PF_INET6,
-				       SOCK_DCCP, IPPROTO_DCCP);
+	err = register_pernet_subsys(&dccp_v6_ops);
 	if (err != 0)
-		goto out_unregister_protosw;
+		goto out_destroy_ctl_sock;
 out:
 	return err;
-out_unregister_protosw:
+
+out_destroy_ctl_sock:
 	inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
 	inet6_unregister_protosw(&dccp_v6_protosw);
 out_unregister_proto:
@@ -1205,6 +1166,7 @@ out_unregister_proto:
 
 static void __exit dccp_v6_exit(void)
 {
+	unregister_pernet_subsys(&dccp_v6_ops);
 	inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
 	inet6_unregister_protosw(&dccp_v6_protosw);
 	proto_unregister(&dccp_v6_prot);