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tcp: syncookies: create mptcp request socket for ACK cookies with MPTCP option

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If SYN packet contains MP_CAPABLE option, keep it enabled.
Syncokie validation and cookie-based socket creation is changed to
instantiate an mptcp request sockets if the ACK contains an MPTCP
connection request.

Rather than extend both cookie_v4/6_check, add a common helper to create
the (mp)tcp request socket.

Suggested-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2020-07-30 21:25:55 +02:00 committed by David S. Miller
parent c83a47e50d
commit 6fc8c827dd
4 changed files with 37 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/tcp.h
View File

@ -469,6 +469,8 @@ struct sock *tcp_get_cookie_sock(struct sock *sk, struct sk_buff *skb,
int __cookie_v4_check(const struct iphdr *iph, const struct tcphdr *th,
u32 cookie);
struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb);
struct request_sock *cookie_tcp_reqsk_alloc(const struct request_sock_ops *ops,
struct sock *sk, struct sk_buff *skb);
#ifdef CONFIG_SYN_COOKIES
/* Syncookies use a monotonic timer which increments every 60 seconds.

38
net/ipv4/syncookies.c
View File

@ -276,6 +276,39 @@ bool cookie_ecn_ok(const struct tcp_options_received *tcp_opt,
}
EXPORT_SYMBOL(cookie_ecn_ok);
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
if (sk_is_mptcp(sk))
ops = &mptcp_subflow_request_sock_ops;
#endif
req = inet_reqsk_alloc(ops, sk, false);
if (!req)
return NULL;
#if IS_ENABLED(CONFIG_MPTCP)
treq = tcp_rsk(req);
treq->is_mptcp = sk_is_mptcp(sk);
if (treq->is_mptcp) {
int err = mptcp_subflow_init_cookie_req(req, sk, skb);
if (err) {
reqsk_free(req);
return NULL;
}
}
#endif
return req;
}
EXPORT_SYMBOL_GPL(cookie_tcp_reqsk_alloc);
/* On input, sk is a listener.
* Output is listener if incoming packet would not create a child
* NULL if memory could not be allocated.
@ -326,7 +359,7 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
goto out;
ret = NULL;
req = inet_reqsk_alloc(&tcp_request_sock_ops, sk, false); /* for safety */
req = cookie_tcp_reqsk_alloc(&tcp_request_sock_ops, sk, skb);
if (!req)
goto out;
@ -350,9 +383,6 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
treq->snt_synack = 0;
treq->tfo_listener = false;
if (IS_ENABLED(CONFIG_MPTCP))
treq->is_mptcp = 0;
if (IS_ENABLED(CONFIG_SMC))
ireq->smc_ok = 0;

3
net/ipv4/tcp_input.c
View File

@ -6701,9 +6701,6 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops,
af_ops->init_req(req, sk, skb);
if (IS_ENABLED(CONFIG_MPTCP) && want_cookie)
tcp_rsk(req)->is_mptcp = 0;
if (security_inet_conn_request(sk, skb, req))
goto drop_and_free;

5
net/ipv6/syncookies.c
View File

@ -170,7 +170,7 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
goto out;
ret = NULL;
req = inet_reqsk_alloc(&tcp6_request_sock_ops, sk, false);
req = cookie_tcp_reqsk_alloc(&tcp6_request_sock_ops, sk, skb);
if (!req)
goto out;
@ -178,9 +178,6 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
treq = tcp_rsk(req);
treq->tfo_listener = false;
if (IS_ENABLED(CONFIG_MPTCP))
treq->is_mptcp = 0;
if (security_inet_conn_request(sk, skb, req))
goto out_free;