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Merge tag 'ipvs-for-v4.8' of https://git.kernel.org/pub/scm/linux/kernel/git/horms/ipvs-next

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Simon Horman says:

====================
IPVS Updates for v4.8

please consider these enhancements to the IPVS. This alters the behaviour
of the "least connection" schedulers such that pre-established connections
are included in the active connection count. This avoids overloading
servers when a large number of new connections arrive in a short space of
time - e.g. when clients reconnect after a node or network failure.
====================

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2016-07-11 12:16:34 +02:00
commit c080b460df
1 changed files with 23 additions and 2 deletions
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25
net/netfilter/ipvs/ip_vs_proto_tcp.c
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@ -395,6 +395,20 @@ static const char *const tcp_state_name_table[IP_VS_TCP_S_LAST+1] = {
[IP_VS_TCP_S_LAST] = "BUG!",
};
static const bool tcp_state_active_table[IP_VS_TCP_S_LAST] = {
[IP_VS_TCP_S_NONE] = false,
[IP_VS_TCP_S_ESTABLISHED] = true,
[IP_VS_TCP_S_SYN_SENT] = true,
[IP_VS_TCP_S_SYN_RECV] = true,
[IP_VS_TCP_S_FIN_WAIT] = false,
[IP_VS_TCP_S_TIME_WAIT] = false,
[IP_VS_TCP_S_CLOSE] = false,
[IP_VS_TCP_S_CLOSE_WAIT] = false,
[IP_VS_TCP_S_LAST_ACK] = false,
[IP_VS_TCP_S_LISTEN] = false,
[IP_VS_TCP_S_SYNACK] = true,
};
#define sNO IP_VS_TCP_S_NONE
#define sES IP_VS_TCP_S_ESTABLISHED
#define sSS IP_VS_TCP_S_SYN_SENT
@ -418,6 +432,13 @@ static const char * tcp_state_name(int state)
return tcp_state_name_table[state] ? tcp_state_name_table[state] : "?";
}
static bool tcp_state_active(int state)
{
if (state >= IP_VS_TCP_S_LAST)
return false;
return tcp_state_active_table[state];
}
static struct tcp_states_t tcp_states [] = {
/* INPUT */
/* sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA */
@ -540,12 +561,12 @@ set_tcp_state(struct ip_vs_proto_data *pd, struct ip_vs_conn *cp,
if (dest) {
if (!(cp->flags & IP_VS_CONN_F_INACTIVE) &&
(new_state != IP_VS_TCP_S_ESTABLISHED)) {
!tcp_state_active(new_state)) {
atomic_dec(&dest->activeconns);
atomic_inc(&dest->inactconns);
cp->flags |= IP_VS_CONN_F_INACTIVE;
} else if ((cp->flags & IP_VS_CONN_F_INACTIVE) &&
(new_state == IP_VS_TCP_S_ESTABLISHED)) {
tcp_state_active(new_state)) {
atomic_inc(&dest->activeconns);
atomic_dec(&dest->inactconns);
cp->flags &= ~IP_VS_CONN_F_INACTIVE;