mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-02-17 14:50:43 -05:00
04d752d60c
In the current test topology, all the routers are connected to each other via dedicated links with addresses of the form fcf0:0:x:y::/64. The test configures rt-3 with an adjacency with rt-4 and rt-4 with an adjacency with rt-1: # ip -n rt_3-IgWSBJ -6 route show tab 90 fcbb:0:300::/48 fcbb:0:300::/48 encap seg6local action End.X nh6 fcf0:0:3:4::4 flavors next-csid lblen 32 nflen 16 dev dum0 metric 1024 pref medium # ip -n rt_4-JdCunK -6 route show tab 90 fcbb:0:400::/48 fcbb:0:400::/48 encap seg6local action End.X nh6 fcf0:0:1:4::1 flavors next-csid lblen 32 nflen 16 dev dum0 metric 1024 pref medium The routes are used when pinging hs-2 from hs-1 and vice-versa. Extend the test to also cover End.X behavior with an IPv6 link-local nexthop address and an output interface. Configure every router interface with an IPv6 link-local address of the form fe80:❌y/64 and before re-running the ping tests, replace the previous End.X routes with routes that use the new IPv6 link-local addresses: # ip -n rt_3-IgWSBJ -6 route show tab 90 fcbb:0:300::/48 fcbb:0:300::/48 encap seg6local action End.X nh6 fe80::4:3 oif veth-rt-3-4 flavors next-csid lblen 32 nflen 16 dev dum0 metric 1024 pref medium # ip -n rt_4-JdCunK -6 route show tab 90 fcbb:0:400::/48 fcbb:0:400::/48 encap seg6local action End.X nh6 fe80::1:4 oif veth-rt-4-1 flavors next-csid lblen 32 nflen 16 dev dum0 metric 1024 pref medium The new test cases fail without the previous patch ("seg6: Allow End.X behavior to accept an oif"): # ./srv6_end_x_next_csid_l3vpn_test.sh [...] ################################################################################ TEST SECTION: SRv6 VPN connectivity test hosts (h1 <-> h2, IPv6), link-local ################################################################################ TEST: IPv6 Hosts connectivity: hs-1 -> hs-2 [FAIL] TEST: IPv6 Hosts connectivity: hs-2 -> hs-1 [FAIL] ################################################################################ TEST SECTION: SRv6 VPN connectivity test hosts (h1 <-> h2, IPv4), link-local ################################################################################ TEST: IPv4 Hosts connectivity: hs-1 -> hs-2 [FAIL] TEST: IPv4 Hosts connectivity: hs-2 -> hs-1 [FAIL] Tests passed: 40 Tests failed: 4 And pass with it: # ./srv6_end_x_next_csid_l3vpn_test.sh [...] ################################################################################ TEST SECTION: SRv6 VPN connectivity test hosts (h1 <-> h2, IPv6), link-local ################################################################################ TEST: IPv6 Hosts connectivity: hs-1 -> hs-2 [ OK ] TEST: IPv6 Hosts connectivity: hs-2 -> hs-1 [ OK ] ################################################################################ TEST SECTION: SRv6 VPN connectivity test hosts (h1 <-> h2, IPv4), link-local ################################################################################ TEST: IPv4 Hosts connectivity: hs-1 -> hs-2 [ OK ] TEST: IPv4 Hosts connectivity: hs-2 -> hs-1 [ OK ] Tests passed: 44 Tests failed: 0 Without the previous patch, rt-3 and rt-4 resolve the wrong routes for the link-local nexthops, with the output interface being the input interface: # perf script [...] ping 1067 [001] 37.554486: fib6:fib6_table_lookup: table 254 oif 0 iif 11 proto 41 cafe::254/0 -> fe80::4:3/0 flowlabel 0xb7973 tos 0 scope 0 flags 2 ==> dev veth-rt-3-1 gw :: err 0 [...] ping 1069 [002] 41.573360: fib6:fib6_table_lookup: table 254 oif 0 iif 12 proto 41 cafe::254/0 -> fe80::1:4/0 flowlabel 0xb7973 tos 0 scope 0 flags 2 ==> dev veth-rt-4-2 gw :: err 0 But the correct routes are resolved with the patch: # perf script [...] ping 1066 [006] 30.672355: fib6:fib6_table_lookup: table 254 oif 13 iif 1 proto 41 cafe::254/0 -> fe80::4:3/0 flowlabel 0x85941 tos 0 scope 0 flags 6 ==> dev veth-rt-3-4 gw :: err 0 [...] ping 1066 [006] 30.672411: fib6:fib6_table_lookup: table 254 oif 11 iif 1 proto 41 cafe::254/0 -> fe80::1:4/0 flowlabel 0x91de0 tos 0 scope 0 flags 6 ==> dev veth-rt-4-1 gw :: err 0 Reviewed-by: Petr Machata <petrm@nvidia.com> Signed-off-by: Ido Schimmel <idosch@nvidia.com> Reviewed-by: Andrea Mayer <andrea.mayer@uniroma2.it> Link: https://patch.msgid.link/20250612122323.584113-5-idosch@nvidia.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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 reStructuredText 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.