summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--include/net/tcp.h8
-rw-r--r--net/ipv4/tcp_fastopen.c35
-rw-r--r--net/ipv4/tcp_input.c19
3 files changed, 34 insertions, 28 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 6630ab180f5c..cdbf63d3c5cf 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1422,10 +1422,10 @@ void tcp_free_fastopen_req(struct tcp_sock *tp);
extern struct tcp_fastopen_context __rcu *tcp_fastopen_ctx;
int tcp_fastopen_reset_cipher(void *key, unsigned int len);
-bool tcp_try_fastopen(struct sock *sk, struct sk_buff *skb,
- struct request_sock *req,
- struct tcp_fastopen_cookie *foc,
- struct dst_entry *dst);
+struct sock *tcp_try_fastopen(struct sock *sk, struct sk_buff *skb,
+ struct request_sock *req,
+ struct tcp_fastopen_cookie *foc,
+ struct dst_entry *dst);
void tcp_fastopen_init_key_once(bool publish);
#define TCP_FASTOPEN_KEY_LENGTH 16
diff --git a/net/ipv4/tcp_fastopen.c b/net/ipv4/tcp_fastopen.c
index f9c0fb84e435..db43c6286cf7 100644
--- a/net/ipv4/tcp_fastopen.c
+++ b/net/ipv4/tcp_fastopen.c
@@ -124,10 +124,10 @@ static bool tcp_fastopen_cookie_gen(struct request_sock *req,
return false;
}
-static bool tcp_fastopen_create_child(struct sock *sk,
- struct sk_buff *skb,
- struct dst_entry *dst,
- struct request_sock *req)
+static struct sock *tcp_fastopen_create_child(struct sock *sk,
+ struct sk_buff *skb,
+ struct dst_entry *dst,
+ struct request_sock *req)
{
struct tcp_sock *tp;
struct request_sock_queue *queue = &inet_csk(sk)->icsk_accept_queue;
@@ -140,7 +140,7 @@ static bool tcp_fastopen_create_child(struct sock *sk,
child = inet_csk(sk)->icsk_af_ops->syn_recv_sock(sk, skb, req, NULL);
if (!child)
- return false;
+ return NULL;
spin_lock(&queue->fastopenq->lock);
queue->fastopenq->qlen++;
@@ -216,9 +216,11 @@ static bool tcp_fastopen_create_child(struct sock *sk,
tcp_rsk(req)->rcv_nxt = tp->rcv_nxt = end_seq;
sk->sk_data_ready(sk);
bh_unlock_sock(child);
- sock_put(child);
+ /* Note: sock_put(child) will be done by tcp_conn_request()
+ * after SYNACK packet is sent.
+ */
WARN_ON(!req->sk);
- return true;
+ return child;
}
static bool tcp_fastopen_queue_check(struct sock *sk)
@@ -261,13 +263,14 @@ static bool tcp_fastopen_queue_check(struct sock *sk)
* may be updated and return the client in the SYN-ACK later. E.g., Fast Open
* cookie request (foc->len == 0).
*/
-bool tcp_try_fastopen(struct sock *sk, struct sk_buff *skb,
- struct request_sock *req,
- struct tcp_fastopen_cookie *foc,
- struct dst_entry *dst)
+struct sock *tcp_try_fastopen(struct sock *sk, struct sk_buff *skb,
+ struct request_sock *req,
+ struct tcp_fastopen_cookie *foc,
+ struct dst_entry *dst)
{
struct tcp_fastopen_cookie valid_foc = { .len = -1 };
bool syn_data = TCP_SKB_CB(skb)->end_seq != TCP_SKB_CB(skb)->seq + 1;
+ struct sock *child;
if (foc->len == 0) /* Client requests a cookie */
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPFASTOPENCOOKIEREQD);
@@ -276,7 +279,7 @@ bool tcp_try_fastopen(struct sock *sk, struct sk_buff *skb,
(syn_data || foc->len >= 0) &&
tcp_fastopen_queue_check(sk))) {
foc->len = -1;
- return false;
+ return NULL;
}
if (syn_data && (sysctl_tcp_fastopen & TFO_SERVER_COOKIE_NOT_REQD))
@@ -296,11 +299,12 @@ bool tcp_try_fastopen(struct sock *sk, struct sk_buff *skb,
* data in SYN_RECV state.
*/
fastopen:
- if (tcp_fastopen_create_child(sk, skb, dst, req)) {
+ child = tcp_fastopen_create_child(sk, skb, dst, req);
+ if (child) {
foc->len = -1;
NET_INC_STATS_BH(sock_net(sk),
LINUX_MIB_TCPFASTOPENPASSIVE);
- return true;
+ return child;
}
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPFASTOPENPASSIVEFAIL);
} else if (foc->len > 0) /* Client presents an invalid cookie */
@@ -308,6 +312,5 @@ fastopen:
valid_foc.exp = foc->exp;
*foc = valid_foc;
- return false;
+ return NULL;
}
-EXPORT_SYMBOL(tcp_try_fastopen);
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 497adf58a6b8..4964d53907e9 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -6111,14 +6111,15 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops,
const struct tcp_request_sock_ops *af_ops,
struct sock *sk, struct sk_buff *skb)
{
+ struct tcp_fastopen_cookie foc = { .len = -1 };
+ __u32 isn = TCP_SKB_CB(skb)->tcp_tw_isn;
struct tcp_options_received tmp_opt;
- struct request_sock *req;
struct tcp_sock *tp = tcp_sk(sk);
+ struct sock *fastopen_sk = NULL;
struct dst_entry *dst = NULL;
- __u32 isn = TCP_SKB_CB(skb)->tcp_tw_isn;
- bool want_cookie = false, fastopen;
+ struct request_sock *req;
+ bool want_cookie = false;
struct flowi fl;
- struct tcp_fastopen_cookie foc = { .len = -1 };
int err;
@@ -6229,11 +6230,13 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops,
tcp_rsk(req)->snt_isn = isn;
tcp_rsk(req)->txhash = net_tx_rndhash();
tcp_openreq_init_rwin(req, sk, dst);
- fastopen = !want_cookie &&
- tcp_try_fastopen(sk, skb, req, &foc, dst);
- err = af_ops->send_synack(sk, dst, &fl, req,
+ if (!want_cookie)
+ fastopen_sk = tcp_try_fastopen(sk, skb, req, &foc, dst);
+ err = af_ops->send_synack(fastopen_sk ?: sk, dst, &fl, req,
skb_get_queue_mapping(skb), &foc);
- if (!fastopen) {
+ if (fastopen_sk) {
+ sock_put(fastopen_sk);
+ } else {
if (err || want_cookie)
goto drop_and_free;