https://lkml.org/lkml/2014/5/5/674 Andi Kleen diff -Nur linux-3.12.20.orig/include/linux/tcp.h linux-3.12.20/include/linux/tcp.h --- linux-3.12.20.orig/include/linux/tcp.h 2014-05-15 09:56:19.000000000 +0200 +++ linux-3.12.20/include/linux/tcp.h 2014-05-30 14:41:11.000000000 +0200 @@ -356,6 +356,9 @@ return (struct tcp_timewait_sock *)sk; } +extern void tcp_sock_destruct(struct sock *sk); + +#ifdef CONFIG_TCP_FASTOPEN static inline bool tcp_passive_fastopen(const struct sock *sk) { return (sk->sk_state == TCP_SYN_RECV && @@ -367,8 +370,6 @@ return foc->len != -1; } -extern void tcp_sock_destruct(struct sock *sk); - static inline int fastopen_init_queue(struct sock *sk, int backlog) { struct request_sock_queue *queue = @@ -388,4 +389,13 @@ return 0; } +#else +static inline bool tcp_passive_fastopen(const struct sock *sk) +{ return false; } +static inline bool fastopen_cookie_present(struct tcp_fastopen_cookie *foc) +{ return false; } +static inline int fastopen_init_queue(struct sock *sk, int backlog) +{ return 0; } +#endif + #endif /* _LINUX_TCP_H */ diff -Nur linux-3.12.20.orig/include/net/request_sock.h linux-3.12.20/include/net/request_sock.h --- linux-3.12.20.orig/include/net/request_sock.h 2014-05-15 09:56:19.000000000 +0200 +++ linux-3.12.20/include/net/request_sock.h 2014-05-30 14:42:55.000000000 +0200 @@ -167,8 +167,14 @@ extern void __reqsk_queue_destroy(struct request_sock_queue *queue); extern void reqsk_queue_destroy(struct request_sock_queue *queue); +#ifdef CONFIG_TCP_FASTOPEN extern void reqsk_fastopen_remove(struct sock *sk, struct request_sock *req, bool reset); +#else +static inline void reqsk_fastopen_remove(struct sock *sk, struct request_sock *req, + bool reset) {} +#endif + static inline struct request_sock * reqsk_queue_yank_acceptq(struct request_sock_queue *queue) diff -Nur linux-3.12.20.orig/include/net/tcp.h linux-3.12.20/include/net/tcp.h --- linux-3.12.20.orig/include/net/tcp.h 2014-05-15 09:56:19.000000000 +0200 +++ linux-3.12.20/include/net/tcp.h 2014-05-30 14:41:11.000000000 +0200 @@ -250,7 +250,11 @@ extern int sysctl_tcp_retries2; extern int sysctl_tcp_orphan_retries; extern int sysctl_tcp_syncookies; +#ifdef CONFIG_TCP_FASTOPEN extern int sysctl_tcp_fastopen; +#else +#define sysctl_tcp_fastopen 0 +#endif extern int sysctl_tcp_retrans_collapse; extern int sysctl_tcp_stdurg; extern int sysctl_tcp_rfc1337; @@ -1325,7 +1329,12 @@ size_t size; int copied; /* queued in tcp_connect() */ }; + +#ifdef CONFIG_TCP_FASTOPEN void tcp_free_fastopen_req(struct tcp_sock *tp); +#else +static inline void tcp_free_fastopen_req(struct tcp_sock *tp) {} +#endif extern struct tcp_fastopen_context __rcu *tcp_fastopen_ctx; int tcp_fastopen_reset_cipher(void *key, unsigned int len); diff -Nur linux-3.12.20.orig/net/Kconfig linux-3.12.20/net/Kconfig --- linux-3.12.20.orig/net/Kconfig 2014-05-15 09:56:19.000000000 +0200 +++ linux-3.12.20/net/Kconfig 2014-05-30 14:41:11.000000000 +0200 @@ -53,8 +53,8 @@ config INET bool "TCP/IP networking" - select CRYPTO - select CRYPTO_AES + select CRYPTO if TCP_FASTOPEN + select CRYPTO_AES if TCP_FASTOPEN ---help--- These are the protocols used on the Internet and on most local Ethernets. It is highly recommended to say Y here (this will enlarge diff -Nur linux-3.12.20.orig/net/core/request_sock.c linux-3.12.20/net/core/request_sock.c --- linux-3.12.20.orig/net/core/request_sock.c 2014-05-15 09:56:19.000000000 +0200 +++ linux-3.12.20/net/core/request_sock.c 2014-05-30 14:41:11.000000000 +0200 @@ -131,6 +131,7 @@ kfree(lopt); } +#ifdef CONFIG_TCP_FASTOPEN /* * This function is called to set a Fast Open socket's "fastopen_rsk" field * to NULL when a TFO socket no longer needs to access the request_sock. @@ -223,3 +224,4 @@ sock_put(lsk); return; } +#endif diff -Nur linux-3.12.20.orig/net/ipv4/Kconfig linux-3.12.20/net/ipv4/Kconfig --- linux-3.12.20.orig/net/ipv4/Kconfig 2014-05-15 09:56:19.000000000 +0200 +++ linux-3.12.20/net/ipv4/Kconfig 2014-05-30 14:41:11.000000000 +0200 @@ -307,6 +307,10 @@ the notion of a secure tunnel for IPSEC and then use routing protocol on top. +config TCP_FASTOPEN + bool "Enable TCP fastopen" + default n + config INET_AH tristate "IP: AH transformation" select XFRM_ALGO diff -Nur linux-3.12.20.orig/net/ipv4/Makefile linux-3.12.20/net/ipv4/Makefile --- linux-3.12.20.orig/net/ipv4/Makefile 2014-05-15 09:56:19.000000000 +0200 +++ linux-3.12.20/net/ipv4/Makefile 2014-05-30 14:41:11.000000000 +0200 @@ -7,7 +7,7 @@ ip_output.o ip_sockglue.o inet_hashtables.o \ inet_timewait_sock.o inet_connection_sock.o \ tcp.o tcp_input.o tcp_output.o tcp_timer.o tcp_ipv4.o \ - tcp_minisocks.o tcp_cong.o tcp_metrics.o tcp_fastopen.o \ + tcp_minisocks.o tcp_cong.o tcp_metrics.o \ tcp_offload.o datagram.o raw.o udp.o udplite.o \ udp_offload.o arp.o icmp.o devinet.o af_inet.o igmp.o \ fib_frontend.o fib_semantics.o fib_trie.o \ @@ -51,6 +51,7 @@ obj-$(CONFIG_TCP_CONG_LP) += tcp_lp.o obj-$(CONFIG_TCP_CONG_YEAH) += tcp_yeah.o obj-$(CONFIG_TCP_CONG_ILLINOIS) += tcp_illinois.o +obj-$(CONFIG_TCP_FASTOPEN) += tcp_fastopen.o obj-$(CONFIG_MEMCG_KMEM) += tcp_memcontrol.o obj-$(CONFIG_NETLABEL) += cipso_ipv4.o diff -Nur linux-3.12.20.orig/net/ipv4/sysctl_net_ipv4.c linux-3.12.20/net/ipv4/sysctl_net_ipv4.c --- linux-3.12.20.orig/net/ipv4/sysctl_net_ipv4.c 2014-05-15 09:56:19.000000000 +0200 +++ linux-3.12.20/net/ipv4/sysctl_net_ipv4.c 2014-05-30 14:41:11.000000000 +0200 @@ -236,6 +236,7 @@ return 0; } +#ifdef CONFIG_TCP_FASTOPEN static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos) @@ -277,6 +278,7 @@ kfree(tbl.data); return ret; } +#endif static struct ctl_table ipv4_table[] = { { @@ -426,6 +428,7 @@ .proc_handler = proc_dointvec }, #endif +#ifdef CONFIG_TCP_FASTOPEN { .procname = "tcp_fastopen", .data = &sysctl_tcp_fastopen, @@ -439,6 +442,7 @@ .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10), .proc_handler = proc_tcp_fastopen_key, }, +#endif { .procname = "tcp_tw_recycle", .data = &tcp_death_row.sysctl_tw_recycle, diff -Nur linux-3.12.20.orig/net/ipv4/tcp.c linux-3.12.20/net/ipv4/tcp.c --- linux-3.12.20.orig/net/ipv4/tcp.c 2014-05-15 09:56:19.000000000 +0200 +++ linux-3.12.20/net/ipv4/tcp.c 2014-05-30 14:41:11.000000000 +0200 @@ -992,6 +992,7 @@ return tmp; } +#ifdef CONFIG_TCP_FASTOPEN void tcp_free_fastopen_req(struct tcp_sock *tp) { if (tp->fastopen_req != NULL) { @@ -1025,6 +1026,7 @@ tcp_free_fastopen_req(tp); return err; } +#endif int tcp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, size_t size) @@ -1040,6 +1042,7 @@ lock_sock(sk); flags = msg->msg_flags; +#ifdef CONFIG_TCP_FASTOPEN if (flags & MSG_FASTOPEN) { err = tcp_sendmsg_fastopen(sk, msg, &copied_syn, size); if (err == -EINPROGRESS && copied_syn > 0) @@ -1048,6 +1051,7 @@ goto out_err; offset = copied_syn; } +#endif timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); diff -Nur linux-3.12.20.orig/net/ipv4/tcp_ipv4.c linux-3.12.20/net/ipv4/tcp_ipv4.c --- linux-3.12.20.orig/net/ipv4/tcp_ipv4.c 2014-05-15 09:56:19.000000000 +0200 +++ linux-3.12.20/net/ipv4/tcp_ipv4.c 2014-05-30 14:41:11.000000000 +0200 @@ -1259,6 +1259,7 @@ }; #endif +#ifdef CONFIG_TCP_FASTOPEN static bool tcp_fastopen_check(struct sock *sk, struct sk_buff *skb, struct request_sock *req, struct tcp_fastopen_cookie *foc, @@ -1439,6 +1440,23 @@ WARN_ON(req->sk == NULL); return 0; } +#else +static bool tcp_fastopen_check(struct sock *sk, struct sk_buff *skb, + struct request_sock *req, + struct tcp_fastopen_cookie *foc, + struct tcp_fastopen_cookie *valid_foc) +{ + return false; +} + +static int tcp_v4_conn_req_fastopen(struct sock *sk, + struct sk_buff *skb, + struct sk_buff *skb_synack, + struct request_sock *req) +{ + return 0; +} +#endif int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb) {