A new field is added to the request sock to record the TOS value
received on the listening socket during 3WHS:
When not under syn flood, it is recording the TOS value sent in SYN.
When under syn flood, it is recording the TOS value sent in the ACK.
This is a preparation patch in order to do TOS reflection in the later
commit.
Signed-off-by: Wei Wang <weiwan@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
* FastOpen it's the seq#
* after data-in-SYN.
*/
+ u8 syn_tos;
};
static inline struct tcp_request_sock *tcp_rsk(const struct request_sock *req)
struct sock *sk,
struct sk_buff *skb)
{
+ struct tcp_request_sock *treq;
struct request_sock *req;
#ifdef CONFIG_MPTCP
- struct tcp_request_sock *treq;
-
if (sk_is_mptcp(sk))
ops = &mptcp_subflow_request_sock_ops;
#endif
if (!req)
return NULL;
-#if IS_ENABLED(CONFIG_MPTCP)
treq = tcp_rsk(req);
+ treq->syn_tos = TCP_SKB_CB(skb)->ip_dsfield;
+#if IS_ENABLED(CONFIG_MPTCP)
treq->is_mptcp = sk_is_mptcp(sk);
if (treq->is_mptcp) {
int err = mptcp_subflow_init_cookie_req(req, sk, skb);
tcp_rsk(req)->snt_isn = isn;
tcp_rsk(req)->txhash = net_tx_rndhash();
+ tcp_rsk(req)->syn_tos = TCP_SKB_CB(skb)->ip_dsfield;
tcp_openreq_init_rwin(req, sk, dst);
sk_rx_queue_set(req_to_sk(req), skb);
if (!want_cookie) {