[PATCH net-next v6 00/11] Fix listing (IPv4, IPv6) and flushing (IPv6) of cached route exceptions

[Stefano Brivio <sbrivio@redhat.com>]

For IPv6 cached routes, the commands 'ip -6 route list cache' and
'ip -6 route flush cache' don't work at all after route exceptions have
been moved to a separate hash table in commit 2b760fcf5cfb ("ipv6: hook
up exception table to store dst cache").

For IPv4 cached routes, the command 'ip route list cache' has also
stopped working in kernel 3.5 after commit 4895c771c7f0 ("ipv4: Add FIB
nexthop exceptions.") introduced storage for route exceptions as a
separate entity.

Fix this by allowing userspace to clearly request cached routes with
the RTM_F_CLONED flag used as a filter (in conjuction with strict
checking) and by retrieving and dumping cached routes if requested.

If strict checking is not requested (iproute2 < 5.0.0), we don't have a
way to consistently filter results on other selectors (e.g. on tables),
so skip filtering entirely and dump both regular routes and exceptions.

For IPv4, cache flushing uses a completely different mechanism, so it
wasn't affected. Listing of exception routes (modified routes pre-3.5) was
tested against these versions of kernel and iproute2:

                    iproute2
kernel         4.14.0   4.15.0   4.19.0   5.0.0   5.1.0
 3.5-rc4         +        +        +        +       +
 4.4
 4.9
 4.14
 4.15
 4.19
 5.0
 5.1
 fixed           +        +        +        +       +


For IPv6, a separate iproute2 patch is required. Versions of iproute2
and kernel tested:

                    iproute2
kernel             4.14.0   4.15.0   4.19.0   5.0.0   5.1.0    5.1.0, patched
 3.18    list        +        +        +        +       +            +
         flush       +        +        +        +       +            +
 4.4     list        +        +        +        +       +            +
         flush       +        +        +        +       +            +
 4.9     list        +        +        +        +       +            +
         flush       +        +        +        +       +            +
 4.14    list        +        +        +        +       +            +
         flush       +        +        +        +       +            +
 4.15    list
         flush
 4.19    list
         flush
 5.0     list
         flush
 5.1     list
         flush
 with    list        +        +        +        +       +            +
 fix     flush       +        +        +                             +

v6: Target for net-next, rebase and adapt to nexthop objects for IPv6 paths.
    Merge selftests into this series (as they were addressed for net-next).
    A number of minor changes detailed in logs of single patches.

v5: Skip filtering altogether if no strict checking is requested: selecting
    routes or exceptions only would be inconsistent with the fact we can't
    filter on tables. Drop 1/8 (non-strict dump filter function no longer
    needed), replace 2/8 (don't use NLM_F_MATCH, decide to skip routes or
    exceptions in filter function), drop 6/8 (2/8 is enough for IPv6 too).
    Introduce dump_routes and dump_exceptions flags in filter, adapt other
    patches to that.

v4: Fix the listing issue also for IPv4, making the behaviour consistent
    with IPv6. Honour NLM_F_MATCH as per RFC 3549 and allow usage of
    RTM_F_CLONED filter. Split patches into smaller logical changes.

v3: Drop check on RTM_F_CLONED and rework logic of return values of
    rt6_dump_route()

v2: Add count of routes handled in partial dumps, and skip them, in patch 1/2.

Stefano Brivio (11):
  fib_frontend, ip6_fib: Select routes or exceptions dump from
    RTM_F_CLONED
  ipv4/fib_frontend: Allow RTM_F_CLONED flag to be used for filtering
  ipv4/route: Allow NULL flowinfo in rt_fill_info()
  ipv4: Dump route exceptions if requested
  Revert "net/ipv6: Bail early if user only wants cloned entries"
  ipv6/route: Don't match on fc_nh_id if not set in ip6_route_del()
  ipv6/route: Change return code of rt6_dump_route() for partial node
    dumps
  ipv6: Dump route exceptions if requested
  ip6_fib: Don't discard nodes with valid routing information in
    fib6_locate_1()
  selftests: pmtu: Introduce list_flush_ipv4_exception test case
  selftests: pmtu: Make list_flush_ipv6_exception test more demanding

 include/net/ip6_fib.h               |   1 +
 include/net/ip6_route.h             |   2 +-
 include/net/ip_fib.h                |   2 +
 include/net/route.h                 |   4 +
 net/ipv4/fib_frontend.c             |  12 ++-
 net/ipv4/fib_trie.c                 |  60 +++++++++++---
 net/ipv4/route.c                    | 113 +++++++++++++++++++------
 net/ipv6/ip6_fib.c                  |  27 ++++--
 net/ipv6/route.c                    | 123 +++++++++++++++++++++++++---
 tools/testing/selftests/net/pmtu.sh |  82 +++++++++++++++++--
 10 files changed, 354 insertions(+), 72 deletions(-)

-- 
2.20.1