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authorSimon Kirby <sim@hostway.ca>2013-08-10 01:26:18 -0700
committerSimon Horman <horms@verge.net.au>2013-09-18 14:38:53 -0500
commitc16526a7b99c1c28e9670a8c8e3dbcf741bb32be (patch)
tree3134c8f812db8676c77f265538289cfe278bb1e1 /net
parent61c5923a2f2d8ab98a1e3c76f17e0f4a871ec75b (diff)
downloadlinux-linaro-stable-c16526a7b99c1c28e9670a8c8e3dbcf741bb32be.tar.gz
ipvs: fix overflow on dest weight multiply
Schedulers such as lblc and lblcr require the weight to be as high as the maximum number of active connections. In commit b552f7e3a9524abcbcdf ("ipvs: unify the formula to estimate the overhead of processing connections"), the consideration of inactconns and activeconns was cleaned up to always count activeconns as 256 times more important than inactconns. In cases where 3000 or more connections are expected, a weight of 3000 * 256 * 3000 connections overflows the 32-bit signed result used to determine if rescheduling is required. On amd64, this merely changes the multiply and comparison instructions to 64-bit. On x86, a 64-bit result is already present from imull, so only a few more comparison instructions are emitted. Signed-off-by: Simon Kirby <sim@hostway.ca> Acked-by: Julian Anastasov <ja@ssi.bg> Signed-off-by: Simon Horman <horms@verge.net.au>
Diffstat (limited to 'net')
-rw-r--r--net/netfilter/ipvs/ip_vs_lblc.c4
-rw-r--r--net/netfilter/ipvs/ip_vs_lblcr.c12
-rw-r--r--net/netfilter/ipvs/ip_vs_nq.c8
-rw-r--r--net/netfilter/ipvs/ip_vs_sed.c8
-rw-r--r--net/netfilter/ipvs/ip_vs_wlc.c6
5 files changed, 19 insertions, 19 deletions
diff --git a/net/netfilter/ipvs/ip_vs_lblc.c b/net/netfilter/ipvs/ip_vs_lblc.c
index 1383b0eadc0e..eb814bf74e64 100644
--- a/net/netfilter/ipvs/ip_vs_lblc.c
+++ b/net/netfilter/ipvs/ip_vs_lblc.c
@@ -443,8 +443,8 @@ __ip_vs_lblc_schedule(struct ip_vs_service *svc)
continue;
doh = ip_vs_dest_conn_overhead(dest);
- if (loh * atomic_read(&dest->weight) >
- doh * atomic_read(&least->weight)) {
+ if ((__s64)loh * atomic_read(&dest->weight) >
+ (__s64)doh * atomic_read(&least->weight)) {
least = dest;
loh = doh;
}
diff --git a/net/netfilter/ipvs/ip_vs_lblcr.c b/net/netfilter/ipvs/ip_vs_lblcr.c
index 5199448697f6..e65f7c573090 100644
--- a/net/netfilter/ipvs/ip_vs_lblcr.c
+++ b/net/netfilter/ipvs/ip_vs_lblcr.c
@@ -200,8 +200,8 @@ static inline struct ip_vs_dest *ip_vs_dest_set_min(struct ip_vs_dest_set *set)
continue;
doh = ip_vs_dest_conn_overhead(dest);
- if ((loh * atomic_read(&dest->weight) >
- doh * atomic_read(&least->weight))
+ if (((__s64)loh * atomic_read(&dest->weight) >
+ (__s64)doh * atomic_read(&least->weight))
&& (dest->flags & IP_VS_DEST_F_AVAILABLE)) {
least = dest;
loh = doh;
@@ -246,8 +246,8 @@ static inline struct ip_vs_dest *ip_vs_dest_set_max(struct ip_vs_dest_set *set)
dest = rcu_dereference_protected(e->dest, 1);
doh = ip_vs_dest_conn_overhead(dest);
/* moh/mw < doh/dw ==> moh*dw < doh*mw, where mw,dw>0 */
- if ((moh * atomic_read(&dest->weight) <
- doh * atomic_read(&most->weight))
+ if (((__s64)moh * atomic_read(&dest->weight) <
+ (__s64)doh * atomic_read(&most->weight))
&& (atomic_read(&dest->weight) > 0)) {
most = dest;
moh = doh;
@@ -611,8 +611,8 @@ __ip_vs_lblcr_schedule(struct ip_vs_service *svc)
continue;
doh = ip_vs_dest_conn_overhead(dest);
- if (loh * atomic_read(&dest->weight) >
- doh * atomic_read(&least->weight)) {
+ if ((__s64)loh * atomic_read(&dest->weight) >
+ (__s64)doh * atomic_read(&least->weight)) {
least = dest;
loh = doh;
}
diff --git a/net/netfilter/ipvs/ip_vs_nq.c b/net/netfilter/ipvs/ip_vs_nq.c
index d8d9860934fe..961a6de9bb29 100644
--- a/net/netfilter/ipvs/ip_vs_nq.c
+++ b/net/netfilter/ipvs/ip_vs_nq.c
@@ -40,7 +40,7 @@
#include <net/ip_vs.h>
-static inline unsigned int
+static inline int
ip_vs_nq_dest_overhead(struct ip_vs_dest *dest)
{
/*
@@ -59,7 +59,7 @@ ip_vs_nq_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,
struct ip_vs_iphdr *iph)
{
struct ip_vs_dest *dest, *least = NULL;
- unsigned int loh = 0, doh;
+ int loh = 0, doh;
IP_VS_DBG(6, "%s(): Scheduling...\n", __func__);
@@ -92,8 +92,8 @@ ip_vs_nq_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,
}
if (!least ||
- (loh * atomic_read(&dest->weight) >
- doh * atomic_read(&least->weight))) {
+ ((__s64)loh * atomic_read(&dest->weight) >
+ (__s64)doh * atomic_read(&least->weight))) {
least = dest;
loh = doh;
}
diff --git a/net/netfilter/ipvs/ip_vs_sed.c b/net/netfilter/ipvs/ip_vs_sed.c
index a5284cc3d882..e446b9fa7424 100644
--- a/net/netfilter/ipvs/ip_vs_sed.c
+++ b/net/netfilter/ipvs/ip_vs_sed.c
@@ -44,7 +44,7 @@
#include <net/ip_vs.h>
-static inline unsigned int
+static inline int
ip_vs_sed_dest_overhead(struct ip_vs_dest *dest)
{
/*
@@ -63,7 +63,7 @@ ip_vs_sed_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,
struct ip_vs_iphdr *iph)
{
struct ip_vs_dest *dest, *least;
- unsigned int loh, doh;
+ int loh, doh;
IP_VS_DBG(6, "%s(): Scheduling...\n", __func__);
@@ -99,8 +99,8 @@ ip_vs_sed_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,
if (dest->flags & IP_VS_DEST_F_OVERLOAD)
continue;
doh = ip_vs_sed_dest_overhead(dest);
- if (loh * atomic_read(&dest->weight) >
- doh * atomic_read(&least->weight)) {
+ if ((__s64)loh * atomic_read(&dest->weight) >
+ (__s64)doh * atomic_read(&least->weight)) {
least = dest;
loh = doh;
}
diff --git a/net/netfilter/ipvs/ip_vs_wlc.c b/net/netfilter/ipvs/ip_vs_wlc.c
index 6dc1fa128840..b5b4650d50a9 100644
--- a/net/netfilter/ipvs/ip_vs_wlc.c
+++ b/net/netfilter/ipvs/ip_vs_wlc.c
@@ -35,7 +35,7 @@ ip_vs_wlc_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,
struct ip_vs_iphdr *iph)
{
struct ip_vs_dest *dest, *least;
- unsigned int loh, doh;
+ int loh, doh;
IP_VS_DBG(6, "ip_vs_wlc_schedule(): Scheduling...\n");
@@ -71,8 +71,8 @@ ip_vs_wlc_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,
if (dest->flags & IP_VS_DEST_F_OVERLOAD)
continue;
doh = ip_vs_dest_conn_overhead(dest);
- if (loh * atomic_read(&dest->weight) >
- doh * atomic_read(&least->weight)) {
+ if ((__s64)loh * atomic_read(&dest->weight) >
+ (__s64)doh * atomic_read(&least->weight)) {
least = dest;
loh = doh;
}