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| author | Florian Westphal <fw@strlen.de> | 2009-04-19 09:43:48 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-04-20 02:25:26 -0700 |
| commit | a0f82f64e26929776c58a5c93c2ecb38e3d82815 (patch) | |
| tree | 8c39812fc6fc8133cc28944e38b44c941d8fa3ce /include | |
| parent | 7eebb0b28f755e297d355a205bb04945b256db6b (diff) | |
| download | linux-3.10-a0f82f64e26929776c58a5c93c2ecb38e3d82815.tar.gz linux-3.10-a0f82f64e26929776c58a5c93c2ecb38e3d82815.tar.bz2 linux-3.10-a0f82f64e26929776c58a5c93c2ecb38e3d82815.zip | |
syncookies: remove last_synq_overflow from struct tcp_sock
last_synq_overflow eats 4 or 8 bytes in struct tcp_sock, even
though it is only used when a listening sockets syn queue
is full.
We can (ab)use rx_opt.ts_recent_stamp to store the same information;
it is not used otherwise as long as a socket is in listen state.
Move linger2 around to avoid splitting struct mtu_probe
across cacheline boundary on 32 bit arches.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/tcp.h | 4 | ||||
| -rw-r--r-- | include/net/tcp.h | 13 |
2 files changed, 14 insertions, 3 deletions
diff --git a/include/linux/tcp.h b/include/linux/tcp.h index 9d5078bd23a..8afac76cd74 100644 --- a/include/linux/tcp.h +++ b/include/linux/tcp.h @@ -377,7 +377,7 @@ struct tcp_sock { unsigned int keepalive_time; /* time before keep alive takes place */ unsigned int keepalive_intvl; /* time interval between keep alive probes */ - unsigned long last_synq_overflow; + int linger2; /* Receiver side RTT estimation */ struct { @@ -406,8 +406,6 @@ struct tcp_sock { /* TCP MD5 Signagure Option information */ struct tcp_md5sig_info *md5sig_info; #endif - - int linger2; }; static inline struct tcp_sock *tcp_sk(const struct sock *sk) diff --git a/include/net/tcp.h b/include/net/tcp.h index 1b94b9bfe2d..b55b4891029 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -265,6 +265,19 @@ static inline int tcp_too_many_orphans(struct sock *sk, int num) atomic_read(&tcp_memory_allocated) > sysctl_tcp_mem[2]); } +/* syncookies: remember time of last synqueue overflow */ +static inline void tcp_synq_overflow(struct sock *sk) +{ + tcp_sk(sk)->rx_opt.ts_recent_stamp = jiffies; +} + +/* syncookies: no recent synqueue overflow on this listening socket? */ +static inline int tcp_synq_no_recent_overflow(const struct sock *sk) +{ + unsigned long last_overflow = tcp_sk(sk)->rx_opt.ts_recent_stamp; + return time_after(jiffies, last_overflow + TCP_TIMEOUT_INIT); +} + extern struct proto tcp_prot; #define TCP_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.tcp_statistics, field) |