3183ab8997
No need to restrict this to module parameter. We export a copy of the real hash size -- when user alters the value we allocate the new table, copy entries etc before we update the real size to the requested one. This is also needed because the real size is used by concurrent readers and cannot be changed without synchronizing the conntrack generation seqcnt. We only allow changing this value from the initial net namespace. Tested using http-client-benchmark vs. httpterm with concurrent while true;do echo $RANDOM > /proc/sys/net/netfilter/nf_conntrack_buckets done Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
179 lines
4.9 KiB
Plaintext
179 lines
4.9 KiB
Plaintext
/proc/sys/net/netfilter/nf_conntrack_* Variables:
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nf_conntrack_acct - BOOLEAN
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0 - disabled (default)
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not 0 - enabled
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Enable connection tracking flow accounting. 64-bit byte and packet
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counters per flow are added.
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nf_conntrack_buckets - INTEGER
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Size of hash table. If not specified as parameter during module
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loading, the default size is calculated by dividing total memory
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by 16384 to determine the number of buckets but the hash table will
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never have fewer than 32 and limited to 16384 buckets. For systems
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with more than 4GB of memory it will be 65536 buckets.
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This sysctl is only writeable in the initial net namespace.
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nf_conntrack_checksum - BOOLEAN
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0 - disabled
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not 0 - enabled (default)
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Verify checksum of incoming packets. Packets with bad checksums are
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in INVALID state. If this is enabled, such packets will not be
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considered for connection tracking.
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nf_conntrack_count - INTEGER (read-only)
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Number of currently allocated flow entries.
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nf_conntrack_events - BOOLEAN
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0 - disabled
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not 0 - enabled (default)
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If this option is enabled, the connection tracking code will
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provide userspace with connection tracking events via ctnetlink.
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nf_conntrack_events_retry_timeout - INTEGER (seconds)
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default 15
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This option is only relevant when "reliable connection tracking
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events" are used. Normally, ctnetlink is "lossy", that is,
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events are normally dropped when userspace listeners can't keep up.
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Userspace can request "reliable event mode". When this mode is
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active, the conntrack will only be destroyed after the event was
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delivered. If event delivery fails, the kernel periodically
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re-tries to send the event to userspace.
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This is the maximum interval the kernel should use when re-trying
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to deliver the destroy event.
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A higher number means there will be fewer delivery retries and it
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will take longer for a backlog to be processed.
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nf_conntrack_expect_max - INTEGER
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Maximum size of expectation table. Default value is
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nf_conntrack_buckets / 256. Minimum is 1.
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nf_conntrack_frag6_high_thresh - INTEGER
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default 262144
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Maximum memory used to reassemble IPv6 fragments. When
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nf_conntrack_frag6_high_thresh bytes of memory is allocated for this
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purpose, the fragment handler will toss packets until
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nf_conntrack_frag6_low_thresh is reached.
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nf_conntrack_frag6_low_thresh - INTEGER
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default 196608
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See nf_conntrack_frag6_low_thresh
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nf_conntrack_frag6_timeout - INTEGER (seconds)
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default 60
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Time to keep an IPv6 fragment in memory.
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nf_conntrack_generic_timeout - INTEGER (seconds)
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default 600
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Default for generic timeout. This refers to layer 4 unknown/unsupported
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protocols.
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nf_conntrack_helper - BOOLEAN
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0 - disabled
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not 0 - enabled (default)
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Enable automatic conntrack helper assignment.
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nf_conntrack_icmp_timeout - INTEGER (seconds)
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default 30
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Default for ICMP timeout.
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nf_conntrack_icmpv6_timeout - INTEGER (seconds)
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default 30
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Default for ICMP6 timeout.
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nf_conntrack_log_invalid - INTEGER
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0 - disable (default)
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1 - log ICMP packets
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6 - log TCP packets
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17 - log UDP packets
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33 - log DCCP packets
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41 - log ICMPv6 packets
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136 - log UDPLITE packets
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255 - log packets of any protocol
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Log invalid packets of a type specified by value.
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nf_conntrack_max - INTEGER
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Size of connection tracking table. Default value is
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nf_conntrack_buckets value * 4.
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nf_conntrack_tcp_be_liberal - BOOLEAN
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0 - disabled (default)
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not 0 - enabled
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Be conservative in what you do, be liberal in what you accept from others.
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If it's non-zero, we mark only out of window RST segments as INVALID.
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nf_conntrack_tcp_loose - BOOLEAN
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0 - disabled
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not 0 - enabled (default)
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If it is set to zero, we disable picking up already established
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connections.
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nf_conntrack_tcp_max_retrans - INTEGER
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default 3
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Maximum number of packets that can be retransmitted without
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received an (acceptable) ACK from the destination. If this number
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is reached, a shorter timer will be started.
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nf_conntrack_tcp_timeout_close - INTEGER (seconds)
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default 10
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nf_conntrack_tcp_timeout_close_wait - INTEGER (seconds)
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default 60
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nf_conntrack_tcp_timeout_established - INTEGER (seconds)
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default 432000 (5 days)
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nf_conntrack_tcp_timeout_fin_wait - INTEGER (seconds)
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default 120
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nf_conntrack_tcp_timeout_last_ack - INTEGER (seconds)
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default 30
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nf_conntrack_tcp_timeout_max_retrans - INTEGER (seconds)
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default 300
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nf_conntrack_tcp_timeout_syn_recv - INTEGER (seconds)
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default 60
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nf_conntrack_tcp_timeout_syn_sent - INTEGER (seconds)
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default 120
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nf_conntrack_tcp_timeout_time_wait - INTEGER (seconds)
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default 120
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nf_conntrack_tcp_timeout_unacknowledged - INTEGER (seconds)
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default 300
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nf_conntrack_timestamp - BOOLEAN
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0 - disabled (default)
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not 0 - enabled
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Enable connection tracking flow timestamping.
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nf_conntrack_udp_timeout - INTEGER (seconds)
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default 30
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nf_conntrack_udp_timeout_stream2 - INTEGER (seconds)
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default 180
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This extended timeout will be used in case there is an UDP stream
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detected.
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