ipv6: add missing ireq_net & ir_cookie initializations

I forgot to update dccp_v6_conn_request() & cookie_v6_check().
They both need to set ireq->ireq_net and ireq->ir_cookie

Lets clear ireq->ir_cookie in inet_reqsk_alloc()
Signed-off-by: NEric Dumazet <edumazet@google.com>
Fixes: 33cf7c90 ("net: add real socket cookies")
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/inet_sock.h

@@ -249,6 +249,7 @@ static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops
 	if (req != NULL) {
 		kmemcheck_annotate_bitfield(ireq, flags);
 		ireq->opt = NULL;
+		atomic64_set(&ireq->ir_cookie, 0);
 	}
 
 	return req;

net/dccp/ipv4.c

@@ -642,7 +642,6 @@ int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
 	ireq->ir_loc_addr = ip_hdr(skb)->daddr;
 	ireq->ir_rmt_addr = ip_hdr(skb)->saddr;
 	write_pnet(&ireq->ireq_net, sock_net(sk));
-	atomic64_set(&ireq->ir_cookie, 0);
 
 	/*
 	 * Step 3: Process LISTEN state

net/dccp/ipv6.c

@@ -403,6 +403,7 @@ static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 	ireq = inet_rsk(req);
 	ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr;
 	ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr;
+	write_pnet(&ireq->ireq_net, sock_net(sk));
 
 	if (ipv6_opt_accepted(sk, skb, IP6CB(skb)) ||
 	    np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||

net/ipv4/tcp_input.c

@@ -5966,7 +5966,6 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops,
 	tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;
 	tcp_openreq_init(req, &tmp_opt, skb, sk);
 	write_pnet(&inet_rsk(req)->ireq_net, sock_net(sk));
-	atomic64_set(&inet_rsk(req)->ir_cookie, 0);
 
 	af_ops->init_req(req, sk, skb);
 

net/ipv6/syncookies.c

@@ -196,6 +196,7 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
 	ireq = inet_rsk(req);
 	treq = tcp_rsk(req);
 	treq->listener = NULL;
+	write_pnet(&ireq->ireq_net, sock_net(sk));
 
 	if (security_inet_conn_request(sk, skb, req))
 		goto out_free;