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ipvs: add assured state for conn templates

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cp->state was not used for templates. Add support for state bits
and for the first "assured" bit which indicates that some
connection controlled by this template was established or assured
by the real server. In a followup patch we will use it to drop
templates under SYN attack.

Signed-off-by: Julian Anastasov <[email protected]>
Signed-off-by: Pablo Neira Ayuso <[email protected]>
This commit is contained in:
Julian Anastasov 2018-07-06 08:25:53 +03:00 • committed by Pablo Neira Ayuso
commit 275411430f
6 changed files with 43 additions and 14 deletions
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16
include/net/ip_vs.h
View file

@ -335,6 +335,11 @@ enum ip_vs_sctp_states {
IP_VS_SCTP_S_LAST
};
/* Connection templates use bits from state */
#define IP_VS_CTPL_S_NONE 0x0000
#define IP_VS_CTPL_S_ASSURED 0x0001
#define IP_VS_CTPL_S_LAST 0x0002
/* Delta sequence info structure
* Each ip_vs_conn has 2 (output AND input seq. changes).
* Only used in the VS/NAT.
@ -1289,6 +1294,17 @@ ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
atomic_inc(&ctl_cp->n_control);
}
/* Mark our template as assured */
static inline void
ip_vs_control_assure_ct(struct ip_vs_conn *cp)
{
struct ip_vs_conn *ct = cp->control;
if (ct && !(ct->state & IP_VS_CTPL_S_ASSURED) &&
(ct->flags & IP_VS_CONN_F_TEMPLATE))
ct->state |= IP_VS_CTPL_S_ASSURED;
}
/* IPVS netns init & cleanup functions */
int ip_vs_estimator_net_init(struct netns_ipvs *ipvs);
int ip_vs_control_net_init(struct netns_ipvs *ipvs);