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| author | Gleb Mazovetskiy <glex.spb@gmail.com> | 2022-11-14 22:56:16 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-11-16 13:02:04 +0000 |
| commit | aeac4ec8f46d610a10adbaeff5e2edf6a88ffc62 (patch) | |
| tree | c5397e6b81c4067acc2e5e49cb3200dcadeb2c0a /net/ipv4/Kconfig | |
| parent | b68777d54fac21fc833ec26ea1a2a84f975ab035 (diff) | |
| download | linux-aeac4ec8f46d610a10adbaeff5e2edf6a88ffc62.tar.gz | |
tcp: configurable source port perturb table size
On embedded systems with little memory and no relevant
security concerns, it is beneficial to reduce the size
of the table.
Reducing the size from 2^16 to 2^8 saves 255 KiB
of kernel RAM.
Makes the table size configurable as an expert option.
The size was previously increased from 2^8 to 2^16
in commit 4c2c8f03a5ab ("tcp: increase source port perturb table to
2^16").
Signed-off-by: Gleb Mazovetskiy <glex.spb@gmail.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/Kconfig')
| -rw-r--r-- | net/ipv4/Kconfig | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig index e983bb0c501270..2dfb12230f0894 100644 --- a/net/ipv4/Kconfig +++ b/net/ipv4/Kconfig @@ -402,6 +402,16 @@ config INET_IPCOMP If unsure, say Y. +config INET_TABLE_PERTURB_ORDER + int "INET: Source port perturbation table size (as power of 2)" if EXPERT + default 16 + help + Source port perturbation table size (as power of 2) for + RFC 6056 3.3.4. Algorithm 4: Double-Hash Port Selection Algorithm. + + The default is almost always what you want. + Only change this if you know what you are doing. + config INET_XFRM_TUNNEL tristate select INET_TUNNEL |