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87486b23f8
Peter Oskolkov says:
====================
This patchset implements BPF_LWT_ENCAP_IP mode in bpf_lwt_push_encap
BPF helper. It enables BPF programs (specifically, BPF_PROG_TYPE_LWT_IN
and BPF_PROG_TYPE_LWT_XMIT prog types) to add IP encapsulation headers
to packets (e.g. IP/GRE, GUE, IPIP).
This is useful when thousands of different short-lived flows should be
encapped, each with different and dynamically determined destination.
Although lwtunnels can be used in some of these scenarios, the ability
to dynamically generate encap headers adds more flexibility, e.g.
when routing depends on the state of the host (reflected in global bpf
maps).
V2 changes: added flowi-based route lookup, IPv6 encapping, and
encapping on ingress.
V3 changes: incorporated David Ahern's suggestions:
- added l3mdev check/oif (patch 2)
- sync bpf.h from include/uapi into tools/include/uapi
- selftest tweaks
V4 changes: moved route lookup/dst change from bpf_push_ip_encap
to when BPF_LWT_REROUTE is handled, as suggested by David Ahern.
V5 changes: added a check in lwt_xmit that skb->protocol stays the
same if the skb is to be passed back to the stack (ret == BPF_OK).
Again, suggested by David Ahern.
V6 changes: abandoned.
V7 changes: added handling of GSO packets (patch 3 in the patchset added),
as suggested by BPF maintainers.
V8 changes:
- fixed build errors when LWT or IPV6 are not enabled;
- whitelisted TCP GSO instead of blacklisting SCTP and UDP GSO, as
suggested by Willem de Bruijn;
- added validation that pushed length cover needed headers when GRE/UDP
encap is detected, as suggested by Willem de Bruijn;
- a couple of minor/stylistic tweaks/fixed typos.
V9 changes:
- fixed a kbuild test robot compiler warning;
- added ipv6_route_input to ipv6_stub (patch 4 in the patchset
added), and IPv6 routing functions are now invoked via ipv6_stub,
as suggested by David Ahern.
V10 changes:
- removed unnecessary IS_ENABLED and pr_warn_once from patch 5.
V11 changes: fixed a potential dst leak in patch 5, as suggested by
David Ahern.
====================
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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| firmware | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
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| README | ||
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.