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authorWei Wang <weiwan@google.com>2020-09-09 17:50:46 -0700
committerDavid S. Miller <davem@davemloft.net>2020-09-10 13:15:40 -0700
commite9b12edc133b54e15ecd105620d51fb8e8fa8bde (patch)
tree7856c1f4c9a95b927f9cac14a7cef33842209cd3 /net
parent3a8c4ad161d48d9674a340f2dea916ae560c3e9d (diff)
tcp: record received TOS value in the request socket
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>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/syncookies.c6
-rw-r--r--net/ipv4/tcp_input.c1
2 files changed, 4 insertions, 3 deletions
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index f0794f0232ba..c375c126f436 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -286,11 +286,10 @@ struct request_sock *cookie_tcp_reqsk_alloc(const struct request_sock_ops *ops,
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
@@ -299,8 +298,9 @@ struct request_sock *cookie_tcp_reqsk_alloc(const struct request_sock_ops *ops,
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);
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 4337841faeff..3658ad84f0c6 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -6834,6 +6834,7 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops,
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) {