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ipvs: fix multiplicative hashing in sh/dh/lblc/lblcr algorithms 

The sh/dh/lblc/lblcr algorithms are using Knuth's multiplicative
hashing incorrectly. Replace its use by the hash_32() macro, which
correctly implements this algorithm. It doesn't use the same constant,
but it shouldn't matter.

Signed-off-by: Vincent Bernat <vincent@bernat.im>
Acked-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>
This commit is contained in:
Vincent Bernat 2018-04-01 12:27:11 +02:00 committed by Simon Horman
parent 30edf801d7
commit 9a17740e0e
4 changed files with 8 additions and 4 deletions
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3
net/netfilter/ipvs/ip_vs_dh.c
View File

@ -43,6 +43,7 @@
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/hash.h>
#include <net/ip_vs.h>
@ -81,7 +82,7 @@ static inline unsigned int ip_vs_dh_hashkey(int af, const union nf_inet_addr *ad
addr_fold = addr->ip6[0]^addr->ip6[1]^
addr->ip6[2]^addr->ip6[3];
#endif
return (ntohl(addr_fold)*2654435761UL) & IP_VS_DH_TAB_MASK;
return hash_32(ntohl(addr_fold), IP_VS_DH_TAB_BITS);
}

3
net/netfilter/ipvs/ip_vs_lblc.c
View File

@ -48,6 +48,7 @@
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/jiffies.h>
#include <linux/hash.h>
/* for sysctl */
#include <linux/fs.h>
@ -160,7 +161,7 @@ ip_vs_lblc_hashkey(int af, const union nf_inet_addr *addr)
addr_fold = addr->ip6[0]^addr->ip6[1]^
addr->ip6[2]^addr->ip6[3];
#endif
return (ntohl(addr_fold)*2654435761UL) & IP_VS_LBLC_TAB_MASK;
return hash_32(ntohl(addr_fold), IP_VS_LBLC_TAB_BITS);
}

3
net/netfilter/ipvs/ip_vs_lblcr.c
View File

@ -47,6 +47,7 @@
#include <linux/jiffies.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/hash.h>
/* for sysctl */
#include <linux/fs.h>
@ -323,7 +324,7 @@ ip_vs_lblcr_hashkey(int af, const union nf_inet_addr *addr)
addr_fold = addr->ip6[0]^addr->ip6[1]^
addr->ip6[2]^addr->ip6[3];
#endif
return (ntohl(addr_fold)*2654435761UL) & IP_VS_LBLCR_TAB_MASK;
return hash_32(ntohl(addr_fold), IP_VS_LBLCR_TAB_BITS);
}

3
net/netfilter/ipvs/ip_vs_sh.c
View File

@ -96,7 +96,8 @@ ip_vs_sh_hashkey(int af, const union nf_inet_addr *addr,
addr_fold = addr->ip6[0]^addr->ip6[1]^
addr->ip6[2]^addr->ip6[3];
#endif
return (offset + (ntohs(port) + ntohl(addr_fold))*2654435761UL) &
return (offset + hash_32(ntohs(port) + ntohl(addr_fold),
IP_VS_SH_TAB_BITS)) &
IP_VS_SH_TAB_MASK;
}