1 files changed, 297 insertions, 118 deletions

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 3a88545a265d..937a02c2e534 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -76,16 +76,9 @@ INDIRECT_CALLABLE_SCOPE int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
 
 static const struct inet_connection_sock_af_ops ipv6_mapped;
 const struct inet_connection_sock_af_ops ipv6_specific;
-#ifdef CONFIG_TCP_MD5SIG
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
 static const struct tcp_sock_af_ops tcp_sock_ipv6_specific;
 static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
-#else
-static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk,
-						   const struct in6_addr *addr,
-						   int l3index)
-{
-	return NULL;
-}
 #endif
 
 /* Helper returning the inet6 address from a given tcp socket.
@@ -135,7 +128,7 @@ static int tcp_v6_pre_connect(struct sock *sk, struct sockaddr *uaddr,
 
 	sock_owned_by_me(sk);
 
-	return BPF_CGROUP_RUN_PROG_INET6_CONNECT(sk, uaddr);
+	return BPF_CGROUP_RUN_PROG_INET6_CONNECT(sk, uaddr, &addr_len);
 }
 
 static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
@@ -163,7 +156,7 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 
 	memset(&fl6, 0, sizeof(fl6));
 
-	if (np->sndflow) {
+	if (inet6_test_bit(SNDFLOW, sk)) {
 		fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
 		IP6_ECN_flow_init(fl6.flowlabel);
 		if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
@@ -239,7 +232,7 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 		if (sk_is_mptcp(sk))
 			mptcpv6_handle_mapped(sk, true);
 		sk->sk_backlog_rcv = tcp_v4_do_rcv;
-#ifdef CONFIG_TCP_MD5SIG
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
 		tp->af_specific = &tcp_sock_ipv6_mapped_specific;
 #endif
 
@@ -252,7 +245,7 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 			if (sk_is_mptcp(sk))
 				mptcpv6_handle_mapped(sk, false);
 			sk->sk_backlog_rcv = tcp_v6_do_rcv;
-#ifdef CONFIG_TCP_MD5SIG
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
 			tp->af_specific = &tcp_sock_ipv6_specific;
 #endif
 			goto failure;
@@ -286,6 +279,7 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 		goto failure;
 	}
 
+	tp->tcp_usec_ts = dst_tcp_usec_ts(dst);
 	tcp_death_row = &sock_net(sk)->ipv4.tcp_death_row;
 
 	if (!saddr) {
@@ -402,6 +396,8 @@ static int tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 	}
 
 	if (sk->sk_state == TCP_TIME_WAIT) {
+		/* To increase the counter of ignored icmps for TCP-AO */
+		tcp_ao_ignore_icmp(sk, AF_INET6, type, code);
 		inet_twsk_put(inet_twsk(sk));
 		return 0;
 	}
@@ -412,6 +408,11 @@ static int tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 		return 0;
 	}
 
+	if (tcp_ao_ignore_icmp(sk, AF_INET6, type, code)) {
+		sock_put(sk);
+		return 0;
+	}
+
 	bh_lock_sock(sk);
 	if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG)
 		__NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS);
@@ -508,7 +509,7 @@ static int tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 			tcp_ld_RTO_revert(sk, seq);
 	}
 
-	if (!sock_owned_by_user(sk) && np->recverr) {
+	if (!sock_owned_by_user(sk) && inet6_test_bit(RECVERR6, sk)) {
 		WRITE_ONCE(sk->sk_err, err);
 		sk_error_report(sk);
 	} else {
@@ -548,7 +549,7 @@ static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst,
 				    &ireq->ir_v6_rmt_addr);
 
 		fl6->daddr = ireq->ir_v6_rmt_addr;
-		if (np->repflow && ireq->pktopts)
+		if (inet6_test_bit(REPFLOW, sk) && ireq->pktopts)
 			fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts));
 
 		tclass = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_reflect_tos) ?
@@ -565,7 +566,7 @@ static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst,
 		if (!opt)
 			opt = rcu_dereference(np->opt);
 		err = ip6_xmit(sk, skb, fl6, skb->mark ? : READ_ONCE(sk->sk_mark),
-			       opt, tclass, sk->sk_priority);
+			       opt, tclass, READ_ONCE(sk->sk_priority));
 		rcu_read_unlock();
 		err = net_xmit_eval(err);
 	}
@@ -606,8 +607,10 @@ static int tcp_v6_parse_md5_keys(struct sock *sk, int optname,
 {
 	struct tcp_md5sig cmd;
 	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;
+	union tcp_ao_addr *addr;
 	int l3index = 0;
 	u8 prefixlen;
+	bool l3flag;
 	u8 flags;
 
 	if (optlen < sizeof(cmd))
@@ -620,6 +623,7 @@ static int tcp_v6_parse_md5_keys(struct sock *sk, int optname,
 		return -EINVAL;
 
 	flags = cmd.tcpm_flags & TCP_MD5SIG_FLAG_IFINDEX;
+	l3flag = cmd.tcpm_flags & TCP_MD5SIG_FLAG_IFINDEX;
 
 	if (optname == TCP_MD5SIG_EXT &&
 	    cmd.tcpm_flags & TCP_MD5SIG_FLAG_PREFIX) {
@@ -660,17 +664,33 @@ static int tcp_v6_parse_md5_keys(struct sock *sk, int optname,
 	if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
 		return -EINVAL;
 
-	if (ipv6_addr_v4mapped(&sin6->sin6_addr))
-		return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
+	if (ipv6_addr_v4mapped(&sin6->sin6_addr)) {
+		addr = (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3];
+
+		/* Don't allow keys for peers that have a matching TCP-AO key.
+		 * See the comment in tcp_ao_add_cmd()
+		 */
+		if (tcp_ao_required(sk, addr, AF_INET,
+				    l3flag ? l3index : -1, false))
+			return -EKEYREJECTED;
+		return tcp_md5_do_add(sk, addr,
 				      AF_INET, prefixlen, l3index, flags,
 				      cmd.tcpm_key, cmd.tcpm_keylen);
+	}
+
+	addr = (union tcp_md5_addr *)&sin6->sin6_addr;
 
-	return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
-			      AF_INET6, prefixlen, l3index, flags,
+	/* Don't allow keys for peers that have a matching TCP-AO key.
+	 * See the comment in tcp_ao_add_cmd()
+	 */
+	if (tcp_ao_required(sk, addr, AF_INET6, l3flag ? l3index : -1, false))
+		return -EKEYREJECTED;
+
+	return tcp_md5_do_add(sk, addr, AF_INET6, prefixlen, l3index, flags,
 			      cmd.tcpm_key, cmd.tcpm_keylen);
 }
 
-static int tcp_v6_md5_hash_headers(struct tcp_md5sig_pool *hp,
+static int tcp_v6_md5_hash_headers(struct tcp_sigpool *hp,
 				   const struct in6_addr *daddr,
 				   const struct in6_addr *saddr,
 				   const struct tcphdr *th, int nbytes)
@@ -691,39 +711,36 @@ static int tcp_v6_md5_hash_headers(struct tcp_md5sig_pool *hp,
 	_th->check = 0;
 
 	sg_init_one(&sg, bp, sizeof(*bp) + sizeof(*th));
-	ahash_request_set_crypt(hp->md5_req, &sg, NULL,
+	ahash_request_set_crypt(hp->req, &sg, NULL,
 				sizeof(*bp) + sizeof(*th));
-	return crypto_ahash_update(hp->md5_req);
+	return crypto_ahash_update(hp->req);
 }
 
 static int tcp_v6_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key,
 			       const struct in6_addr *daddr, struct in6_addr *saddr,
 			       const struct tcphdr *th)
 {
-	struct tcp_md5sig_pool *hp;
-	struct ahash_request *req;
+	struct tcp_sigpool hp;
 
-	hp = tcp_get_md5sig_pool();
-	if (!hp)
-		goto clear_hash_noput;
-	req = hp->md5_req;
+	if (tcp_sigpool_start(tcp_md5_sigpool_id, &hp))
+		goto clear_hash_nostart;
 
-	if (crypto_ahash_init(req))
+	if (crypto_ahash_init(hp.req))
 		goto clear_hash;
-	if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, th->doff << 2))
+	if (tcp_v6_md5_hash_headers(&hp, daddr, saddr, th, th->doff << 2))
 		goto clear_hash;
-	if (tcp_md5_hash_key(hp, key))
+	if (tcp_md5_hash_key(&hp, key))
 		goto clear_hash;
-	ahash_request_set_crypt(req, NULL, md5_hash, 0);
-	if (crypto_ahash_final(req))
+	ahash_request_set_crypt(hp.req, NULL, md5_hash, 0);
+	if (crypto_ahash_final(hp.req))
 		goto clear_hash;
 
-	tcp_put_md5sig_pool();
+	tcp_sigpool_end(&hp);
 	return 0;
 
 clear_hash:
-	tcp_put_md5sig_pool();
-clear_hash_noput:
+	tcp_sigpool_end(&hp);
+clear_hash_nostart:
 	memset(md5_hash, 0, 16);
 	return 1;
 }
@@ -733,10 +750,9 @@ static int tcp_v6_md5_hash_skb(char *md5_hash,
 			       const struct sock *sk,
 			       const struct sk_buff *skb)
 {
-	const struct in6_addr *saddr, *daddr;
-	struct tcp_md5sig_pool *hp;
-	struct ahash_request *req;
 	const struct tcphdr *th = tcp_hdr(skb);
+	const struct in6_addr *saddr, *daddr;
+	struct tcp_sigpool hp;
 
 	if (sk) { /* valid for establish/request sockets */
 		saddr = &sk->sk_v6_rcv_saddr;
@@ -747,34 +763,31 @@ static int tcp_v6_md5_hash_skb(char *md5_hash,
 		daddr = &ip6h->daddr;
 	}
 
-	hp = tcp_get_md5sig_pool();
-	if (!hp)
-		goto clear_hash_noput;
-	req = hp->md5_req;
+	if (tcp_sigpool_start(tcp_md5_sigpool_id, &hp))
+		goto clear_hash_nostart;
 
-	if (crypto_ahash_init(req))
+	if (crypto_ahash_init(hp.req))
 		goto clear_hash;
 
-	if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, skb->len))
+	if (tcp_v6_md5_hash_headers(&hp, daddr, saddr, th, skb->len))
 		goto clear_hash;
-	if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2))
+	if (tcp_sigpool_hash_skb_data(&hp, skb, th->doff << 2))
 		goto clear_hash;
-	if (tcp_md5_hash_key(hp, key))
+	if (tcp_md5_hash_key(&hp, key))
 		goto clear_hash;
-	ahash_request_set_crypt(req, NULL, md5_hash, 0);
-	if (crypto_ahash_final(req))
+	ahash_request_set_crypt(hp.req, NULL, md5_hash, 0);
+	if (crypto_ahash_final(hp.req))
 		goto clear_hash;
 
-	tcp_put_md5sig_pool();
+	tcp_sigpool_end(&hp);
 	return 0;
 
 clear_hash:
-	tcp_put_md5sig_pool();
-clear_hash_noput:
+	tcp_sigpool_end(&hp);
+clear_hash_nostart:
 	memset(md5_hash, 0, 16);
 	return 1;
 }
-
 #endif
 
 static void tcp_v6_init_req(struct request_sock *req,
@@ -797,7 +810,7 @@ static void tcp_v6_init_req(struct request_sock *req,
 	    (ipv6_opt_accepted(sk_listener, skb, &TCP_SKB_CB(skb)->header.h6) ||
 	     np->rxopt.bits.rxinfo ||
 	     np->rxopt.bits.rxoinfo || np->rxopt.bits.rxhlim ||
-	     np->rxopt.bits.rxohlim || np->repflow)) {
+	     np->rxopt.bits.rxohlim || inet6_test_bit(REPFLOW, sk_listener))) {
 		refcount_inc(&skb->users);
 		ireq->pktopts = skb;
 	}
@@ -833,6 +846,11 @@ const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
 	.req_md5_lookup	=	tcp_v6_md5_lookup,
 	.calc_md5_hash	=	tcp_v6_md5_hash_skb,
 #endif
+#ifdef CONFIG_TCP_AO
+	.ao_lookup	=	tcp_v6_ao_lookup_rsk,
+	.ao_calc_key	=	tcp_v6_ao_calc_key_rsk,
+	.ao_synack_hash =	tcp_v6_ao_synack_hash,
+#endif
 #ifdef CONFIG_SYN_COOKIES
 	.cookie_init_seq =	cookie_v6_init_sequence,
 #endif
@@ -844,8 +862,8 @@ const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
 
 static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32 seq,
 				 u32 ack, u32 win, u32 tsval, u32 tsecr,
-				 int oif, struct tcp_md5sig_key *key, int rst,
-				 u8 tclass, __be32 label, u32 priority, u32 txhash)
+				 int oif, int rst, u8 tclass, __be32 label,
+				 u32 priority, u32 txhash, struct tcp_key *key)
 {
 	const struct tcphdr *th = tcp_hdr(skb);
 	struct tcphdr *t1;
@@ -860,13 +878,13 @@ static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32
 
 	if (tsecr)
 		tot_len += TCPOLEN_TSTAMP_ALIGNED;
-#ifdef CONFIG_TCP_MD5SIG
-	if (key)
+	if (tcp_key_is_md5(key))
 		tot_len += TCPOLEN_MD5SIG_ALIGNED;
-#endif
+	if (tcp_key_is_ao(key))
+		tot_len += tcp_ao_len(key->ao_key);
 
 #ifdef CONFIG_MPTCP
-	if (rst && !key) {
+	if (rst && !tcp_key_is_md5(key)) {
 		mrst = mptcp_reset_option(skb);
 
 		if (mrst)
@@ -907,14 +925,28 @@ static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32
 		*topt++ = mrst;
 
 #ifdef CONFIG_TCP_MD5SIG
-	if (key) {
+	if (tcp_key_is_md5(key)) {
 		*topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
 				(TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
-		tcp_v6_md5_hash_hdr((__u8 *)topt, key,
+		tcp_v6_md5_hash_hdr((__u8 *)topt, key->md5_key,
 				    &ipv6_hdr(skb)->saddr,
 				    &ipv6_hdr(skb)->daddr, t1);
 	}
 #endif
+#ifdef CONFIG_TCP_AO
+	if (tcp_key_is_ao(key)) {
+		*topt++ = htonl((TCPOPT_AO << 24) |
+				(tcp_ao_len(key->ao_key) << 16) |
+				(key->ao_key->sndid << 8) |
+				(key->rcv_next));
+
+		tcp_ao_hash_hdr(AF_INET6, (char *)topt, key->ao_key,
+				key->traffic_key,
+				(union tcp_ao_addr *)&ipv6_hdr(skb)->saddr,
+				(union tcp_ao_addr *)&ipv6_hdr(skb)->daddr,
+				t1, key->sne);
+	}
+#endif
 
 	memset(&fl6, 0, sizeof(fl6));
 	fl6.daddr = ipv6_hdr(skb)->saddr;
@@ -977,19 +1009,23 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
 {
 	const struct tcphdr *th = tcp_hdr(skb);
 	struct ipv6hdr *ipv6h = ipv6_hdr(skb);
-	u32 seq = 0, ack_seq = 0;
-	struct tcp_md5sig_key *key = NULL;
-#ifdef CONFIG_TCP_MD5SIG
-	const __u8 *hash_location = NULL;
-	unsigned char newhash[16];
-	int genhash;
-	struct sock *sk1 = NULL;
+	const __u8 *md5_hash_location = NULL;
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
+	bool allocated_traffic_key = false;
 #endif
+	const struct tcp_ao_hdr *aoh;
+	struct tcp_key key = {};
+	u32 seq = 0, ack_seq = 0;
 	__be32 label = 0;
 	u32 priority = 0;
 	struct net *net;
 	u32 txhash = 0;
 	int oif = 0;
+#ifdef CONFIG_TCP_MD5SIG
+	unsigned char newhash[16];
+	int genhash;
+	struct sock *sk1 = NULL;
+#endif
 
 	if (th->rst)
 		return;
@@ -1001,9 +1037,13 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
 		return;
 
 	net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev);
-#ifdef CONFIG_TCP_MD5SIG
+	/* Invalid TCP option size or twice included auth */
+	if (tcp_parse_auth_options(th, &md5_hash_location, &aoh))
+		return;
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
 	rcu_read_lock();
-	hash_location = tcp_parse_md5sig_option(th);
+#endif
+#ifdef CONFIG_TCP_MD5SIG
 	if (sk && sk_fullsock(sk)) {
 		int l3index;
 
@@ -1011,8 +1051,10 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
 		 * in an L3 domain and inet_iif is set to it.
 		 */
 		l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0;
-		key = tcp_v6_md5_do_lookup(sk, &ipv6h->saddr, l3index);
-	} else if (hash_location) {
+		key.md5_key = tcp_v6_md5_do_lookup(sk, &ipv6h->saddr, l3index);
+		if (key.md5_key)
+			key.type = TCP_KEY_MD5;
+	} else if (md5_hash_location) {
 		int dif = tcp_v6_iif_l3_slave(skb);
 		int sdif = tcp_v6_sdif(skb);
 		int l3index;
@@ -1036,12 +1078,13 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
 		 */
 		l3index = tcp_v6_sdif(skb) ? dif : 0;
 
-		key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr, l3index);
-		if (!key)
+		key.md5_key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr, l3index);
+		if (!key.md5_key)
 			goto out;
+		key.type = TCP_KEY_MD5;
 
-		genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, skb);
-		if (genhash || memcmp(hash_location, newhash, 16) != 0)
+		genhash = tcp_v6_md5_hash_skb(newhash, key.md5_key, NULL, skb);
+		if (genhash || memcmp(md5_hash_location, newhash, 16) != 0)
 			goto out;
 	}
 #endif
@@ -1052,15 +1095,27 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
 		ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len -
 			  (th->doff << 2);
 
+#ifdef CONFIG_TCP_AO
+	if (aoh) {
+		int l3index;
+
+		l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0;
+		if (tcp_ao_prepare_reset(sk, skb, aoh, l3index, seq,
+					 &key.ao_key, &key.traffic_key,
+					 &allocated_traffic_key,
+					 &key.rcv_next, &key.sne))
+			goto out;
+		key.type = TCP_KEY_AO;
+	}
+#endif
+
 	if (sk) {
 		oif = sk->sk_bound_dev_if;
 		if (sk_fullsock(sk)) {
-			const struct ipv6_pinfo *np = tcp_inet6_sk(sk);
-
 			trace_tcp_send_reset(sk, skb);
-			if (np->repflow)
+			if (inet6_test_bit(REPFLOW, sk))
 				label = ip6_flowlabel(ipv6h);
-			priority = sk->sk_priority;
+			priority = READ_ONCE(sk->sk_priority);
 			txhash = sk->sk_txhash;
 		}
 		if (sk->sk_state == TCP_TIME_WAIT) {
@@ -1073,45 +1128,141 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
 			label = ip6_flowlabel(ipv6h);
 	}
 
-	tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1,
-			     ipv6_get_dsfield(ipv6h), label, priority, txhash);
+	tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, 1,
+			     ipv6_get_dsfield(ipv6h), label, priority, txhash,
+			     &key);
 
-#ifdef CONFIG_TCP_MD5SIG
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
 out:
+	if (allocated_traffic_key)
+		kfree(key.traffic_key);
 	rcu_read_unlock();
 #endif
 }
 
 static void tcp_v6_send_ack(const struct sock *sk, struct sk_buff *skb, u32 seq,
 			    u32 ack, u32 win, u32 tsval, u32 tsecr, int oif,
-			    struct tcp_md5sig_key *key, u8 tclass,
+			    struct tcp_key *key, u8 tclass,
 			    __be32 label, u32 priority, u32 txhash)
 {
-	tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, key, 0,
-			     tclass, label, priority, txhash);
+	tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, 0,
+			     tclass, label, priority, txhash, key);
 }
 
 static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
 {
 	struct inet_timewait_sock *tw = inet_twsk(sk);
 	struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
+	struct tcp_key key = {};
+#ifdef CONFIG_TCP_AO
+	struct tcp_ao_info *ao_info;
+
+	if (static_branch_unlikely(&tcp_ao_needed.key)) {
+
+		/* FIXME: the segment to-be-acked is not verified yet */
+		ao_info = rcu_dereference(tcptw->ao_info);
+		if (ao_info) {
+			const struct tcp_ao_hdr *aoh;
+
+			/* Invalid TCP option size or twice included auth */
+			if (tcp_parse_auth_options(tcp_hdr(skb), NULL, &aoh))
+				goto out;
+			if (aoh)
+				key.ao_key = tcp_ao_established_key(ao_info,
+						aoh->rnext_keyid, -1);
+		}
+	}
+	if (key.ao_key) {
+		struct tcp_ao_key *rnext_key;
+
+		key.traffic_key = snd_other_key(key.ao_key);
+		/* rcv_next switches to our rcv_next */
+		rnext_key = READ_ONCE(ao_info->rnext_key);
+		key.rcv_next = rnext_key->rcvid;
+		key.sne = READ_ONCE(ao_info->snd_sne);
+		key.type = TCP_KEY_AO;
+#else
+	if (0) {
+#endif
+#ifdef CONFIG_TCP_MD5SIG
+	} else if (static_branch_unlikely(&tcp_md5_needed.key)) {
+		key.md5_key = tcp_twsk_md5_key(tcptw);
+		if (key.md5_key)
+			key.type = TCP_KEY_MD5;
+#endif
+	}
 
 	tcp_v6_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
 			tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
-			tcp_time_stamp_raw() + tcptw->tw_ts_offset,
-			tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw),
+			tcp_tw_tsval(tcptw),
+			tcptw->tw_ts_recent, tw->tw_bound_dev_if, &key,
 			tw->tw_tclass, cpu_to_be32(tw->tw_flowlabel), tw->tw_priority,
 			tw->tw_txhash);
 
+#ifdef CONFIG_TCP_AO
+out:
+#endif
 	inet_twsk_put(tw);
 }
 
 static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
 				  struct request_sock *req)
 {
-	int l3index;
+	struct tcp_key key = {};
 
-	l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0;
+#ifdef CONFIG_TCP_AO
+	if (static_branch_unlikely(&tcp_ao_needed.key) &&
+	    tcp_rsk_used_ao(req)) {
+		const struct in6_addr *addr = &ipv6_hdr(skb)->saddr;
+		const struct tcp_ao_hdr *aoh;
+		int l3index;
+
+		l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0;
+		/* Invalid TCP option size or twice included auth */
+		if (tcp_parse_auth_options(tcp_hdr(skb), NULL, &aoh))
+			return;
+		if (!aoh)
+			return;
+		key.ao_key = tcp_ao_do_lookup(sk, l3index,
+					      (union tcp_ao_addr *)addr,
+					      AF_INET6, aoh->rnext_keyid, -1);
+		if (unlikely(!key.ao_key)) {
+			/* Send ACK with any matching MKT for the peer */
+			key.ao_key = tcp_ao_do_lookup(sk, l3index,
+						      (union tcp_ao_addr *)addr,
+						      AF_INET6, -1, -1);
+			/* Matching key disappeared (user removed the key?)
+			 * let the handshake timeout.
+			 */
+			if (!key.ao_key) {
+				net_info_ratelimited("TCP-AO key for (%pI6, %d)->(%pI6, %d) suddenly disappeared, won't ACK new connection\n",
+						     addr,
+						     ntohs(tcp_hdr(skb)->source),
+						     &ipv6_hdr(skb)->daddr,
+						     ntohs(tcp_hdr(skb)->dest));
+				return;
+			}
+		}
+		key.traffic_key = kmalloc(tcp_ao_digest_size(key.ao_key), GFP_ATOMIC);
+		if (!key.traffic_key)
+			return;
+
+		key.type = TCP_KEY_AO;
+		key.rcv_next = aoh->keyid;
+		tcp_v6_ao_calc_key_rsk(key.ao_key, key.traffic_key, req);
+#else
+	if (0) {
+#endif
+#ifdef CONFIG_TCP_MD5SIG
+	} else if (static_branch_unlikely(&tcp_md5_needed.key)) {
+		int l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0;
+
+		key.md5_key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->saddr,
+						   l3index);
+		if (key.md5_key)
+			key.type = TCP_KEY_MD5;
+#endif
+	}
 
 	/* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV
 	 * sk->sk_state == TCP_SYN_RECV -> for Fast Open.
@@ -1125,12 +1276,13 @@ static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
 			tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt,
 			tcp_rsk(req)->rcv_nxt,
 			req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale,
-			tcp_time_stamp_raw() + tcp_rsk(req)->ts_off,
+			tcp_rsk_tsval(tcp_rsk(req)),
 			READ_ONCE(req->ts_recent), sk->sk_bound_dev_if,
-			tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->saddr, l3index),
-			ipv6_get_dsfield(ipv6_hdr(skb)), 0,
+			&key, ipv6_get_dsfield(ipv6_hdr(skb)), 0,
 			READ_ONCE(sk->sk_priority),
 			READ_ONCE(tcp_rsk(req)->txhash));
+	if (tcp_key_is_ao(&key))
+		kfree(key.traffic_key);
 }
 
 
@@ -1235,7 +1387,7 @@ static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *
 		if (sk_is_mptcp(newsk))
 			mptcpv6_handle_mapped(newsk, true);
 		newsk->sk_backlog_rcv = tcp_v4_do_rcv;
-#ifdef CONFIG_TCP_MD5SIG
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
 		newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
 #endif
 
@@ -1247,7 +1399,7 @@ static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *
 		newnp->mcast_oif   = inet_iif(skb);
 		newnp->mcast_hops  = ip_hdr(skb)->ttl;
 		newnp->rcv_flowinfo = 0;
-		if (np->repflow)
+		if (inet6_test_bit(REPFLOW, sk))
 			newnp->flow_label = 0;
 
 		/*
@@ -1320,7 +1472,7 @@ static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *
 	newnp->mcast_oif  = tcp_v6_iif(skb);
 	newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
 	newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb));
-	if (np->repflow)
+	if (inet6_test_bit(REPFLOW, sk))
 		newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb));
 
 	/* Set ToS of the new socket based upon the value of incoming SYN.
@@ -1360,19 +1512,26 @@ static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *
 #ifdef CONFIG_TCP_MD5SIG
 	l3index = l3mdev_master_ifindex_by_index(sock_net(sk), ireq->ir_iif);
 
-	/* Copy over the MD5 key from the original socket */
-	key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr, l3index);
-	if (key) {
-		const union tcp_md5_addr *addr;
-
-		addr = (union tcp_md5_addr *)&newsk->sk_v6_daddr;
-		if (tcp_md5_key_copy(newsk, addr, AF_INET6, 128, l3index, key)) {
-			inet_csk_prepare_forced_close(newsk);
-			tcp_done(newsk);
-			goto out;
+	if (!tcp_rsk_used_ao(req)) {
+		/* Copy over the MD5 key from the original socket */
+		key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr, l3index);
+		if (key) {
+			const union tcp_md5_addr *addr;
+
+			addr = (union tcp_md5_addr *)&newsk->sk_v6_daddr;
+			if (tcp_md5_key_copy(newsk, addr, AF_INET6, 128, l3index, key)) {
+				inet_csk_prepare_forced_close(newsk);
+				tcp_done(newsk);
+				goto out;
+			}
 		}
 	}
 #endif
+#ifdef CONFIG_TCP_AO
+	/* Copy over tcp_ao_info if any */
+	if (tcp_ao_copy_all_matching(sk, newsk, req, skb, AF_INET6))
+		goto out; /* OOM */
+#endif
 
 	if (__inet_inherit_port(sk, newsk) < 0) {
 		inet_csk_prepare_forced_close(newsk);
@@ -1542,10 +1701,11 @@ ipv6_pktoptions:
 		if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
 			np->mcast_oif = tcp_v6_iif(opt_skb);
 		if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
-			np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
+			WRITE_ONCE(np->mcast_hops,
+				   ipv6_hdr(opt_skb)->hop_limit);
 		if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass)
 			np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb));
-		if (np->repflow)
+		if (inet6_test_bit(REPFLOW, sk))
 			np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb));
 		if (ipv6_opt_accepted(sk, opt_skb, &TCP_SKB_CB(opt_skb)->header.h6)) {
 			tcp_v6_restore_cb(opt_skb);
@@ -1640,9 +1800,12 @@ process:
 		struct sock *nsk;
 
 		sk = req->rsk_listener;
-		drop_reason = tcp_inbound_md5_hash(sk, skb,
-						   &hdr->saddr, &hdr->daddr,
-						   AF_INET6, dif, sdif);
+		if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
+			drop_reason = SKB_DROP_REASON_XFRM_POLICY;
+		else
+			drop_reason = tcp_inbound_hash(sk, req, skb,
+						       &hdr->saddr, &hdr->daddr,
+						       AF_INET6, dif, sdif);
 		if (drop_reason) {
 			sk_drops_add(sk, skb);
 			reqsk_put(req);
@@ -1689,6 +1852,7 @@ process:
 			}
 			goto discard_and_relse;
 		}
+		nf_reset_ct(skb);
 		if (nsk == sk) {
 			reqsk_put(req);
 			tcp_v6_restore_cb(skb);
@@ -1715,8 +1879,8 @@ process:
 		goto discard_and_relse;
 	}
 
-	drop_reason = tcp_inbound_md5_hash(sk, skb, &hdr->saddr, &hdr->daddr,
-					   AF_INET6, dif, sdif);
+	drop_reason = tcp_inbound_hash(sk, NULL, skb, &hdr->saddr, &hdr->daddr,
+				       AF_INET6, dif, sdif);
 	if (drop_reason)
 		goto discard_and_relse;
 
@@ -1891,7 +2055,6 @@ const struct inet_connection_sock_af_ops ipv6_specific = {
 	.conn_request	   = tcp_v6_conn_request,
 	.syn_recv_sock	   = tcp_v6_syn_recv_sock,
 	.net_header_len	   = sizeof(struct ipv6hdr),
-	.net_frag_header_len = sizeof(struct frag_hdr),
 	.setsockopt	   = ipv6_setsockopt,
 	.getsockopt	   = ipv6_getsockopt,
 	.addr2sockaddr	   = inet6_csk_addr2sockaddr,
@@ -1899,11 +2062,19 @@ const struct inet_connection_sock_af_ops ipv6_specific = {
 	.mtu_reduced	   = tcp_v6_mtu_reduced,
 };
 
-#ifdef CONFIG_TCP_MD5SIG
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
 static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
+#ifdef CONFIG_TCP_MD5SIG
 	.md5_lookup	=	tcp_v6_md5_lookup,
 	.calc_md5_hash	=	tcp_v6_md5_hash_skb,
 	.md5_parse	=	tcp_v6_parse_md5_keys,
+#endif
+#ifdef CONFIG_TCP_AO
+	.ao_lookup	=	tcp_v6_ao_lookup,
+	.calc_ao_hash	=	tcp_v6_ao_hash_skb,
+	.ao_parse	=	tcp_v6_parse_ao,
+	.ao_calc_key_sk	=	tcp_v6_ao_calc_key_sk,
+#endif
 };
 #endif
 
@@ -1925,11 +2096,19 @@ static const struct inet_connection_sock_af_ops ipv6_mapped = {
 	.mtu_reduced	   = tcp_v4_mtu_reduced,
 };
 
-#ifdef CONFIG_TCP_MD5SIG
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
 static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
+#ifdef CONFIG_TCP_MD5SIG
 	.md5_lookup	=	tcp_v4_md5_lookup,
 	.calc_md5_hash	=	tcp_v4_md5_hash_skb,
 	.md5_parse	=	tcp_v6_parse_md5_keys,
+#endif
+#ifdef CONFIG_TCP_AO
+	.ao_lookup	=	tcp_v6_ao_lookup,
+	.calc_ao_hash	=	tcp_v4_ao_hash_skb,
+	.ao_parse	=	tcp_v6_parse_ao,
+	.ao_calc_key_sk	=	tcp_v4_ao_calc_key_sk,
+#endif
 };
 #endif
 
@@ -1944,7 +2123,7 @@ static int tcp_v6_init_sock(struct sock *sk)
 
 	icsk->icsk_af_ops = &ipv6_specific;
 
-#ifdef CONFIG_TCP_MD5SIG
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
 	tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific;
 #endif