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❦ 2 avril 2018 10:33 -0700, Eric Dumazet <eric.dumazet@xxxxxxxxx> :
>> +static inline u32
>> +ip_vs_csh_permutation(struct ip_vs_dest *d, int j)
>> +{
>> + u32 offset, skip;
>> + __be32 addr_fold = d->addr.ip;
>> +
>> +#ifdef CONFIG_IP_VS_IPV6
>> + if (d->af == AF_INET6)
>> + addr_fold = d->addr.ip6[0]^d->addr.ip6[1]^
>> + d->addr.ip6[2]^d->addr.ip6[3];
>> +#endif
>> + addr_fold = ntohl(addr_fold) + ntohs(d->port);
>> + offset = hash_32(addr_fold, 32) % IP_VS_CSH_TAB_SIZE;
>> + skip = (hash_32(addr_fold + 1, 32) % (IP_VS_CSH_TAB_SIZE - 1)) + 1;
>> + return (offset + j * skip) % IP_VS_CSH_TAB_SIZE;
>> +}
>> +
>
> This does not look very strong to me, particularly the IPv6 folding
>
> I would rather use __ipv6_addr_jhash() instead of ipv6_addr_hash(),
> even if it is hard coded ;)
I can switch to ipv6_addr_hash(). However, switching to
__ipv6_addr_jhash seems useless as I would need to hardcode the initial
value: people use source hashing to get the same result from one host to
another. Am I missing something?
--
Each module should do one thing well.
- The Elements of Programming Style (Kernighan & Plauger)
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