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Documentation: networking: ip-sysctl: Document src_valid_mark sysctl

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Provide documentation for src_valid_mark sysctl, which was added
in commit 28f6aeea3f ("net: restore ip source validation").

Signed-off-by: Jay Vosburgh <jay.vosburgh@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jay Vosburgh
2021-02-08 17:37:01 -08:00
committed by David S. Miller
parent 1e2e61af19
commit 8cf5d8cc3e
1 changed files with 19 additions and 0 deletions
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19
Documentation/networking/ip-sysctl.rst
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@@ -1446,6 +1446,25 @@ rp_filter - INTEGER
Default value is 0. Note that some distributions enable it Default value is 0. Note that some distributions enable it
in startup scripts. in startup scripts.
src_valid_mark - BOOLEAN
- 0 - The fwmark of the packet is not included in reverse path
route lookup. This allows for asymmetric routing configurations
utilizing the fwmark in only one direction, e.g., transparent
proxying.
- 1 - The fwmark of the packet is included in reverse path route
lookup. This permits rp_filter to function when the fwmark is
used for routing traffic in both directions.
This setting also affects the utilization of fmwark when
performing source address selection for ICMP replies, or
determining addresses stored for the IPOPT_TS_TSANDADDR and
IPOPT_RR IP options.
The max value from conf/{all,interface}/src_valid_mark is used.
Default value is 0.
arp_filter - BOOLEAN arp_filter - BOOLEAN
- 1 - Allows you to have multiple network interfaces on the same - 1 - Allows you to have multiple network interfaces on the same
subnet, and have the ARPs for each interface be answered subnet, and have the ARPs for each interface be answered