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net: add inet_sk_transparent() helper

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Avoids cluttering tcp_v4_send_reset when followup patch extends
it to deal with timewait sockets.

Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Eric Dumazet <edumazet@google.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2015-12-21 21:29:24 +01:00 committed by David S. Miller
parent f4cee3af0d
commit b1f0a0e99c
2 changed files with 13 additions and 1 deletions
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2
include/net/request_sock.h
View File

@ -68,7 +68,7 @@ struct request_sock {
u32 peer_secid;
};
static inline struct request_sock *inet_reqsk(struct sock *sk)
static inline struct request_sock *inet_reqsk(const struct sock *sk)
{
return (struct request_sock *)sk;
}

12
include/net/tcp.h
View File

@ -1620,6 +1620,18 @@ static inline void tcp_highest_sack_combine(struct sock *sk,
tcp_sk(sk)->highest_sack = new;
}
/* This helper checks if socket has IP_TRANSPARENT set */
static inline bool inet_sk_transparent(const struct sock *sk)
{
switch (sk->sk_state) {
case TCP_TIME_WAIT:
return inet_twsk(sk)->tw_transparent;
case TCP_NEW_SYN_RECV:
return inet_rsk(inet_reqsk(sk))->no_srccheck;
}
return inet_sk(sk)->transparent;
}
/* Determines whether this is a thin stream (which may suffer from
* increased latency). Used to trigger latency-reducing mechanisms.
*/