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Xin Long says: ==================== net: handle the exp removal problem with ovs upcall properly With the OVS upcall, the original ct in the skb will be dropped, and when the skb comes back from userspace it has to create a new ct again through nf_conntrack_in() in either OVS __ovs_ct_lookup() or TC tcf_ct_act(). However, the new ct will not be able to have the exp as the original ct has taken it away from the hash table in nf_ct_find_expectation(). This will cause some flow never to be matched, like: 'ip,ct_state=-trk,in_port=1 actions=ct(zone=1)' 'ip,ct_state=+trk+new+rel,in_port=1 actions=ct(commit,zone=1)' 'ip,ct_state=+trk+new+rel,in_port=1 actions=ct(commit,zone=2),normal' if the 2nd flow triggers the OVS upcall, the 3rd flow will never get matched. OVS conntrack works around this by adding its own exp lookup function to not remove the exp from the hash table and saving the exp and its master info to the flow keys instead of create a real ct. But this way doesn't work for TC act_ct. The patch 1/3 allows nf_ct_find_expectation() not to remove the exp from the hash table if tmpl is set with IPS_CONFIRMED when doing lookup. This allows both OVS conntrack and TC act_ct to have a simple and clear fix for this problem in the patch 2/3 and 3/3. ==================== Link: https://lore.kernel.org/r/cover.1689541664.git.lucien.xin@gmail.com Signed-off-by: Paolo Abeni <pabeni@redhat.com> |
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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.
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.