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od: tcp: reduce source port perturb table size #13

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od: tcp: reduce source port perturb table size #13

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9 changes: 4 additions & 5 deletions net/ipv4/inet_hashtables.c
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Original file line number Diff line number Diff line change
Expand Up @@ -906,12 +906,11 @@ EXPORT_SYMBOL_GPL(inet_bhash2_update_saddr);
* Note that we use 32bit integers (vs RFC 'short integers')
* because 2^16 is not a multiple of num_ephemeral and this
* property might be used by clever attacker.
* RFC claims using TABLE_LENGTH=10 buckets gives an improvement, though
* attacks were since demonstrated, thus we use 65536 instead to really
* give more isolation and privacy, at the expense of 256kB of kernel
* memory.
* RFC claims using TABLE_LENGTH=10 buckets gives an improvement,
* we use 256 instead to really give more isolation and
* privacy, this only consumes 1 KB of kernel memory.
*/
#define INET_TABLE_PERTURB_SHIFT 16
#define INET_TABLE_PERTURB_SHIFT 8
#define INET_TABLE_PERTURB_SIZE (1 << INET_TABLE_PERTURB_SHIFT)
static u32 *table_perturb;

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