diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/tcp.h | 3 | ||||
| -rw-r--r-- | include/net/tcp.h | 22 |
2 files changed, 25 insertions, 0 deletions
diff --git a/include/linux/tcp.h b/include/linux/tcp.h index bcebc4f07532..6982f10e826b 100644 --- a/include/linux/tcp.h +++ b/include/linux/tcp.h @@ -316,6 +316,9 @@ struct tcp_sock { */ u32 app_limited; /* limited until "delivered" reaches this val */ u32 rcv_wnd; /* Current receiver window */ + u32 rcv_mwnd_seq; /* Maximum window sequence number (RFC 7323, + * section 2.4, receiver requirements) + */ u32 rcv_tstamp; /* timestamp of last received ACK (for keepalives) */ /* * Options received (usually on last packet, some only on SYN packets). diff --git a/include/net/tcp.h b/include/net/tcp.h index 48dffcca0a71..f87bdacb5a69 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -934,6 +934,28 @@ static inline u32 tcp_receive_window(const struct tcp_sock *tp) return (u32) win; } +/* Compute the maximum receive window we ever advertised. + * Rcv_nxt can be after the window if our peer push more data + * than the offered window. + */ +static inline u32 tcp_max_receive_window(const struct tcp_sock *tp) +{ + s32 win = tp->rcv_mwnd_seq - tp->rcv_nxt; + + if (win < 0) + win = 0; + return (u32) win; +} + +/* Check if we need to update the maximum receive window sequence number */ +static inline void tcp_update_max_rcv_wnd_seq(struct tcp_sock *tp) +{ + u32 wre = tp->rcv_wup + tp->rcv_wnd; + + if (after(wre, tp->rcv_mwnd_seq)) + tp->rcv_mwnd_seq = wre; +} + /* Choose a new window, without checks for shrinking, and without * scaling applied to the result. The caller does these things * if necessary. This is a "raw" window selection. |