diff options
Diffstat (limited to 'include/net/tcp.h')
| -rw-r--r-- | include/net/tcp.h | 90 |
1 files changed, 75 insertions, 15 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index 9a0021d..6feeccd 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -98,11 +98,21 @@ extern void tcp_time_wait(struct sock *sk, int state, int timeo); * 15 is ~13-30min depending on RTO. */ -#define TCP_SYN_RETRIES 5 /* number of times to retry active opening a - * connection: ~180sec is RFC minimum */ +#define TCP_SYN_RETRIES 6 /* This is how many retries are done + * when active opening a connection. + * RFC1122 says the minimum retry MUST + * be at least 180secs. Nevertheless + * this value is corresponding to + * 63secs of retransmission with the + * current initial RTO. + */ -#define TCP_SYNACK_RETRIES 5 /* number of times to retry passive opening a - * connection: ~180sec is RFC minimum */ +#define TCP_SYNACK_RETRIES 5 /* This is how may retries are done + * when passive opening a connection. + * This is corresponding to 31secs of + * retransmission with the current + * initial RTO. + */ #define TCP_TIMEWAIT_LEN (60*HZ) /* how long to wait to destroy TIME-WAIT * state, about 60 seconds */ @@ -214,8 +224,24 @@ extern void tcp_time_wait(struct sock *sk, int state, int timeo); /* Bit Flags for sysctl_tcp_fastopen */ #define TFO_CLIENT_ENABLE 1 +#define TFO_SERVER_ENABLE 2 #define TFO_CLIENT_NO_COOKIE 4 /* Data in SYN w/o cookie option */ +/* Process SYN data but skip cookie validation */ +#define TFO_SERVER_COOKIE_NOT_CHKED 0x100 +/* Accept SYN data w/o any cookie option */ +#define TFO_SERVER_COOKIE_NOT_REQD 0x200 + +/* Force enable TFO on all listeners, i.e., not requiring the + * TCP_FASTOPEN socket option. SOCKOPT1/2 determine how to set max_qlen. + */ +#define TFO_SERVER_WO_SOCKOPT1 0x400 +#define TFO_SERVER_WO_SOCKOPT2 0x800 +/* Always create TFO child sockets on a TFO listener even when + * cookie/data not present. (For testing purpose!) + */ +#define TFO_SERVER_ALWAYS 0x1000 + extern struct inet_timewait_death_row tcp_death_row; /* sysctl variables for tcp */ @@ -398,7 +424,8 @@ extern enum tcp_tw_status tcp_timewait_state_process(struct inet_timewait_sock * const struct tcphdr *th); extern struct sock * tcp_check_req(struct sock *sk,struct sk_buff *skb, struct request_sock *req, - struct request_sock **prev); + struct request_sock **prev, + bool fastopen); extern int tcp_child_process(struct sock *parent, struct sock *child, struct sk_buff *skb); extern bool tcp_use_frto(struct sock *sk); @@ -411,12 +438,6 @@ extern void tcp_metrics_init(void); extern bool tcp_peer_is_proven(struct request_sock *req, struct dst_entry *dst, bool paws_check); extern bool tcp_remember_stamp(struct sock *sk); extern bool tcp_tw_remember_stamp(struct inet_timewait_sock *tw); -extern void tcp_fastopen_cache_get(struct sock *sk, u16 *mss, - struct tcp_fastopen_cookie *cookie, - int *syn_loss, unsigned long *last_syn_loss); -extern void tcp_fastopen_cache_set(struct sock *sk, u16 mss, - struct tcp_fastopen_cookie *cookie, - bool syn_lost); extern void tcp_fetch_timewait_stamp(struct sock *sk, struct dst_entry *dst); extern void tcp_disable_fack(struct tcp_sock *tp); extern void tcp_close(struct sock *sk, long timeout); @@ -458,7 +479,8 @@ extern int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, extern int tcp_connect(struct sock *sk); extern struct sk_buff * tcp_make_synack(struct sock *sk, struct dst_entry *dst, struct request_sock *req, - struct request_values *rvp); + struct request_values *rvp, + struct tcp_fastopen_cookie *foc); extern int tcp_disconnect(struct sock *sk, int flags); void tcp_connect_init(struct sock *sk); @@ -527,6 +549,7 @@ extern void tcp_send_delayed_ack(struct sock *sk); extern void tcp_cwnd_application_limited(struct sock *sk); extern void tcp_resume_early_retransmit(struct sock *sk); extern void tcp_rearm_rto(struct sock *sk); +extern void tcp_reset(struct sock *sk); /* tcp_timer.c */ extern void tcp_init_xmit_timers(struct sock *); @@ -576,6 +599,7 @@ extern int tcp_mtu_to_mss(struct sock *sk, int pmtu); extern int tcp_mss_to_mtu(struct sock *sk, int mss); extern void tcp_mtup_init(struct sock *sk); extern void tcp_valid_rtt_meas(struct sock *sk, u32 seq_rtt); +extern void tcp_init_buffer_space(struct sock *sk); static inline void tcp_bound_rto(const struct sock *sk) { @@ -889,15 +913,21 @@ static inline bool tcp_in_initial_slowstart(const struct tcp_sock *tp) return tp->snd_ssthresh >= TCP_INFINITE_SSTHRESH; } +static inline bool tcp_in_cwnd_reduction(const struct sock *sk) +{ + return (TCPF_CA_CWR | TCPF_CA_Recovery) & + (1 << inet_csk(sk)->icsk_ca_state); +} + /* If cwnd > ssthresh, we may raise ssthresh to be half-way to cwnd. - * The exception is rate halving phase, when cwnd is decreasing towards + * The exception is cwnd reduction phase, when cwnd is decreasing towards * ssthresh. */ static inline __u32 tcp_current_ssthresh(const struct sock *sk) { const struct tcp_sock *tp = tcp_sk(sk); - if ((1 << inet_csk(sk)->icsk_ca_state) & (TCPF_CA_CWR | TCPF_CA_Recovery)) + if (tcp_in_cwnd_reduction(sk)) return tp->snd_ssthresh; else return max(tp->snd_ssthresh, @@ -1094,6 +1124,8 @@ static inline void tcp_openreq_init(struct request_sock *req, req->rcv_wnd = 0; /* So that tcp_send_synack() knows! */ req->cookie_ts = 0; tcp_rsk(req)->rcv_isn = TCP_SKB_CB(skb)->seq; + tcp_rsk(req)->rcv_nxt = TCP_SKB_CB(skb)->seq + 1; + tcp_rsk(req)->snt_synack = 0; req->mss = rx_opt->mss_clamp; req->ts_recent = rx_opt->saw_tstamp ? rx_opt->rcv_tsval : 0; ireq->tstamp_ok = rx_opt->tstamp_ok; @@ -1106,6 +1138,15 @@ static inline void tcp_openreq_init(struct request_sock *req, ireq->loc_port = tcp_hdr(skb)->dest; } +/* Compute time elapsed between SYNACK and the ACK completing 3WHS */ +static inline void tcp_synack_rtt_meas(struct sock *sk, + struct request_sock *req) +{ + if (tcp_rsk(req)->snt_synack) + tcp_valid_rtt_meas(sk, + tcp_time_stamp - tcp_rsk(req)->snt_synack); +} + extern void tcp_enter_memory_pressure(struct sock *sk); static inline int keepalive_intvl_when(const struct tcp_sock *tp) @@ -1298,15 +1339,34 @@ extern int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *, const struct sk_buff extern int tcp_md5_hash_key(struct tcp_md5sig_pool *hp, const struct tcp_md5sig_key *key); +/* From tcp_fastopen.c */ +extern void tcp_fastopen_cache_get(struct sock *sk, u16 *mss, + struct tcp_fastopen_cookie *cookie, + int *syn_loss, unsigned long *last_syn_loss); +extern void tcp_fastopen_cache_set(struct sock *sk, u16 mss, + struct tcp_fastopen_cookie *cookie, + bool syn_lost); struct tcp_fastopen_request { /* Fast Open cookie. Size 0 means a cookie request */ struct tcp_fastopen_cookie cookie; struct msghdr *data; /* data in MSG_FASTOPEN */ u16 copied; /* queued in tcp_connect() */ }; - 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); +void tcp_fastopen_cookie_gen(__be32 addr, struct tcp_fastopen_cookie *foc); + +#define TCP_FASTOPEN_KEY_LENGTH 16 + +/* Fastopen key context */ +struct tcp_fastopen_context { + struct crypto_cipher __rcu *tfm; + __u8 key[TCP_FASTOPEN_KEY_LENGTH]; + struct rcu_head rcu; +}; + /* write queue abstraction */ static inline void tcp_write_queue_purge(struct sock *sk) { |
