diff options
| author | Tom Herbert <tom@herbertland.com> | 2016-03-08 01:11:05 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-03-10 00:36:14 +0300 |
| commit | 473bd239b808a8af5241ce9996a16d283d88ddff (patch) | |
| tree | 1a02155265887fa8e2893ddc144a656c240349ee /include | |
| parent | fa9835e52e3ea946916c2ce6c625c86421131740 (diff) | |
| download | linux-473bd239b808a8af5241ce9996a16d283d88ddff.tar.xz | |
tcp: Add tcp_inq to get available receive bytes on socket
Create a common kernel function to get the number of bytes available
on a TCP socket. This is based on code in INQ getsockopt and we now call
the function for that getsockopt.
Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/net/tcp.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index e90db8546806..0302636af98c 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -1816,4 +1816,28 @@ static inline void skb_set_tcp_pure_ack(struct sk_buff *skb) skb->truesize = 2; } +static inline int tcp_inq(struct sock *sk) +{ + struct tcp_sock *tp = tcp_sk(sk); + int answ; + + if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { + answ = 0; + } else if (sock_flag(sk, SOCK_URGINLINE) || + !tp->urg_data || + before(tp->urg_seq, tp->copied_seq) || + !before(tp->urg_seq, tp->rcv_nxt)) { + + answ = tp->rcv_nxt - tp->copied_seq; + + /* Subtract 1, if FIN was received */ + if (answ && sock_flag(sk, SOCK_DONE)) + answ--; + } else { + answ = tp->urg_seq - tp->copied_seq; + } + + return answ; +} + #endif /* _TCP_H */ |