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Merge tag 'ipvs2-for-v4.7' of https://git.kernel.org/pub/scm/linux/kernel/git/horms/ipvs-next

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Simon Horman says:

====================
Second Round of IPVS Updates for v4.7

please consider these enhancements to the IPVS. They allow its DoS
mitigation strategy effective in conjunction with the SIP persistence
engine.
====================

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2016-05-06 11:50:52 +02:00
commit bbe848ec1a
2 changed files with 26 additions and 4 deletions
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22
net/netfilter/ipvs/ip_vs_conn.c
View File

@ -1261,6 +1261,16 @@ static inline int todrop_entry(struct ip_vs_conn *cp)
return 1;
}
static inline bool ip_vs_conn_ops_mode(struct ip_vs_conn *cp)
{
struct ip_vs_service *svc;
if (!cp->dest)
return false;
svc = rcu_dereference(cp->dest->svc);
return svc && (svc->flags & IP_VS_SVC_F_ONEPACKET);
}
/* Called from keventd and must protect itself from softirqs */
void ip_vs_random_dropentry(struct netns_ipvs *ipvs)
{
@ -1275,11 +1285,16 @@ void ip_vs_random_dropentry(struct netns_ipvs *ipvs)
unsigned int hash = prandom_u32() & ip_vs_conn_tab_mask;
hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[hash], c_list) {
if (cp->flags & IP_VS_CONN_F_TEMPLATE)
/* connection template */
continue;
if (cp->ipvs != ipvs)
continue;
if (cp->flags & IP_VS_CONN_F_TEMPLATE) {
if (atomic_read(&cp->n_control) ||
!ip_vs_conn_ops_mode(cp))
continue;
else
/* connection template of OPS */
goto try_drop;
}
if (cp->protocol == IPPROTO_TCP) {
switch(cp->state) {
case IP_VS_TCP_S_SYN_RECV:
@ -1307,6 +1322,7 @@ void ip_vs_random_dropentry(struct netns_ipvs *ipvs)
continue;
}
} else {
try_drop:
if (!todrop_entry(cp))
continue;
}

8
net/netfilter/ipvs/ip_vs_core.c
View File

@ -612,7 +612,10 @@ int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
ret = cp->packet_xmit(skb, cp, pd->pp, iph);
/* do not touch skb anymore */
atomic_inc(&cp->in_pkts);
if ((cp->flags & IP_VS_CONN_F_ONE_PACKET) && cp->control)
atomic_inc(&cp->control->in_pkts);
else
atomic_inc(&cp->in_pkts);
ip_vs_conn_put(cp);
return ret;
}
@ -1991,6 +1994,9 @@ ip_vs_in(struct netns_ipvs *ipvs, unsigned int hooknum, struct sk_buff *skb, int
if (ipvs->sync_state & IP_VS_STATE_MASTER)
ip_vs_sync_conn(ipvs, cp, pkts);
else if ((cp->flags & IP_VS_CONN_F_ONE_PACKET) && cp->control)
/* increment is done inside ip_vs_sync_conn too */
atomic_inc(&cp->control->in_pkts);
ip_vs_conn_put(cp);
return ret;