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-rw-r--r--net/ipv4/tcp_metrics.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c
index 1a115b665792..d02ff3777785 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)
{