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| author | Florian Westphal <fw@strlen.de> | 2021-08-26 16:54:19 +0300 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2021-08-30 12:49:54 +0300 |
| commit | d532bcd0b2699d84d71a0c71d37157ac6eb3be25 (patch) | |
| tree | af1c997d9ea725f60249456b7b04f0c4500d4305 /Documentation/networking | |
| parent | e3245a7b7b34bd2e97f744fd79463add6e9d41f4 (diff) | |
| download | linux-d532bcd0b2699d84d71a0c71d37157ac6eb3be25.tar.xz | |
netfilter: conntrack: sanitize table size default settings
conntrack has two distinct table size settings:
nf_conntrack_max and nf_conntrack_buckets.
The former limits how many conntrack objects are allowed to exist
in each namespace.
The second sets the size of the hashtable.
As all entries are inserted twice (once for original direction, once for
reply), there should be at least twice as many buckets in the table than
the maximum number of conntrack objects that can exist at the same time.
Change the default multiplier to 1 and increase the chosen bucket sizes.
This results in the same nf_conntrack_max settings as before but reduces
the average bucket list length.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'Documentation/networking')
| -rw-r--r-- | Documentation/networking/nf_conntrack-sysctl.rst | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/Documentation/networking/nf_conntrack-sysctl.rst b/Documentation/networking/nf_conntrack-sysctl.rst index 024d784157c8..de3815dd4d49 100644 --- a/Documentation/networking/nf_conntrack-sysctl.rst +++ b/Documentation/networking/nf_conntrack-sysctl.rst @@ -17,9 +17,8 @@ nf_conntrack_acct - BOOLEAN nf_conntrack_buckets - INTEGER Size of hash table. If not specified as parameter during module loading, the default size is calculated by dividing total memory - by 16384 to determine the number of buckets but the hash table will - never have fewer than 32 and limited to 16384 buckets. For systems - with more than 4GB of memory it will be 65536 buckets. + by 16384 to determine the number of buckets. The hash table will + never have fewer than 1024 and never more than 262144 buckets. This sysctl is only writeable in the initial net namespace. nf_conntrack_checksum - BOOLEAN @@ -100,8 +99,12 @@ nf_conntrack_log_invalid - INTEGER Log invalid packets of a type specified by value. nf_conntrack_max - INTEGER - Size of connection tracking table. Default value is - nf_conntrack_buckets value * 4. + Maximum number of allowed connection tracking entries. This value is set + to nf_conntrack_buckets by default. + Note that connection tracking entries are added to the table twice -- once + for the original direction and once for the reply direction (i.e., with + the reversed address). This means that with default settings a maxed-out + table will have a average hash chain length of 2, not 1. nf_conntrack_tcp_be_liberal - BOOLEAN - 0 - disabled (default) |