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Currently, ip[6]frag_high_thresh sysctl values in new namespaces are hard-limited to those of the root/init ns. There are at least two use cases when it would be desirable to set the high_thresh values higher in a child namespace vs the global hard limit: - a security/ddos protection policy may lower the thresholds in the root/init ns but allow for a special exception in a child namespace - testing: a test running in a namespace may want to set these thresholds higher in its namespace than what is in the root/init ns The new behavior: # ip netns add testns # ip netns exec testns bash # sysctl -w net.ipv4.ipfrag_high_thresh=9000000 net.ipv4.ipfrag_high_thresh = 9000000 # sysctl net.ipv4.ipfrag_high_thresh net.ipv4.ipfrag_high_thresh = 9000000 # sysctl -w net.ipv6.ip6frag_high_thresh=9000000 net.ipv6.ip6frag_high_thresh = 9000000 # sysctl net.ipv6.ip6frag_high_thresh net.ipv6.ip6frag_high_thresh = 9000000 The old behavior: # ip netns add testns # ip netns exec testns bash # sysctl -w net.ipv4.ipfrag_high_thresh=9000000 net.ipv4.ipfrag_high_thresh = 9000000 # sysctl net.ipv4.ipfrag_high_thresh net.ipv4.ipfrag_high_thresh = 4194304 # sysctl -w net.ipv6.ip6frag_high_thresh=9000000 net.ipv6.ip6frag_high_thresh = 9000000 # sysctl net.ipv6.ip6frag_high_thresh net.ipv6.ip6frag_high_thresh = 4194304 Signed-off-by: Peter Oskolkov <posk@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.