diff options
| -rw-r--r-- | include/net/tcp.h | 4 | ||||
| -rw-r--r-- | net/ipv4/tcp_metrics.c | 51 |
2 files changed, 55 insertions, 0 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index 5aed3718fde..e601da19736 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -405,6 +405,10 @@ 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); +extern void tcp_fastopen_cache_set(struct sock *sk, u16 mss, + struct tcp_fastopen_cookie *cookie); 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); diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c index 1a115b66579..d02ff377778 100644 --- a/net/ipv4/tcp_metrics.c +++ b/net/ipv4/tcp_metrics.c @@ -30,6 +30,11 @@ enum tcp_metric_index { TCP_METRIC_MAX, }; +struct tcp_fastopen_metrics { + u16 mss; + struct tcp_fastopen_cookie cookie; +}; + struct tcp_metrics_block { struct tcp_metrics_block __rcu *tcpm_next; struct inetpeer_addr tcpm_addr; @@ -38,6 +43,7 @@ struct tcp_metrics_block { u32 tcpm_ts_stamp; u32 tcpm_lock; u32 tcpm_vals[TCP_METRIC_MAX]; + struct tcp_fastopen_metrics tcpm_fastopen; }; static bool tcp_metric_locked(struct tcp_metrics_block *tm, @@ -118,6 +124,8 @@ static void tcpm_suck_dst(struct tcp_metrics_block *tm, struct dst_entry *dst) tm->tcpm_vals[TCP_METRIC_REORDERING] = dst_metric_raw(dst, RTAX_REORDERING); tm->tcpm_ts = 0; tm->tcpm_ts_stamp = 0; + tm->tcpm_fastopen.mss = 0; + tm->tcpm_fastopen.cookie.len = 0; } static struct tcp_metrics_block *tcpm_new(struct dst_entry *dst, @@ -633,6 +641,49 @@ bool tcp_tw_remember_stamp(struct inet_timewait_sock *tw) return ret; } +static DEFINE_SEQLOCK(fastopen_seqlock); + +void tcp_fastopen_cache_get(struct sock *sk, u16 *mss, + struct tcp_fastopen_cookie *cookie) +{ + struct tcp_metrics_block *tm; + + rcu_read_lock(); + tm = tcp_get_metrics(sk, __sk_dst_get(sk), false); + if (tm) { + struct tcp_fastopen_metrics *tfom = &tm->tcpm_fastopen; + unsigned int seq; + + do { + seq = read_seqbegin(&fastopen_seqlock); + if (tfom->mss) + *mss = tfom->mss; + *cookie = tfom->cookie; + } while (read_seqretry(&fastopen_seqlock, seq)); + } + rcu_read_unlock(); +} + + +void tcp_fastopen_cache_set(struct sock *sk, u16 mss, + struct tcp_fastopen_cookie *cookie) +{ + struct tcp_metrics_block *tm; + + rcu_read_lock(); + tm = tcp_get_metrics(sk, __sk_dst_get(sk), true); + if (tm) { + struct tcp_fastopen_metrics *tfom = &tm->tcpm_fastopen; + + write_seqlock_bh(&fastopen_seqlock); + tfom->mss = mss; + if (cookie->len > 0) + tfom->cookie = *cookie; + write_sequnlock_bh(&fastopen_seqlock); + } + rcu_read_unlock(); +} + static unsigned long tcpmhash_entries; static int __init set_tcpmhash_entries(char *str) { |