In this series, we mainly add some skb drop reasons to the input path of
ip routing, and we make the following functions return drop reasons:

  fib_validate_source()
  ip_route_input_mc()
  ip_mc_validate_source()
  ip_route_input_slow()
  ip_route_input_rcu()
  ip_route_input_noref()
  ip_route_input()
  ip_mkroute_input()
  __mkroute_input()
  ip_route_use_hint()

In order to make fib_validate_source() return drop reasons, we do some
refactoring to fib_validate_source() and __fib_validate_source(). The
main idea is to combine fib_validate_source() into __fib_validate_source()
and make fib_validate_source() an inline call to __fib_validate_source()
in the 1st patch.

And following new skb drop reasons are added:

  SKB_DROP_REASON_IP_LOCAL_SOURCE
  SKB_DROP_REASON_IP_INVALID_SOURCE
  SKB_DROP_REASON_IP_LOCALNET
  SKB_DROP_REASON_IP_INVALID_DEST

Changes since v2:
- refactor fib_validate_source and __fib_validate_source to make
  fib_validate_source return drop reasons
- add the 9th and 10th patches to make this series cover the input route
  code path

Changes since v1:
- make ip_route_input_noref/ip_route_input_rcu/ip_route_input_slow return
  drop reasons, instead of passing a local variable to their function
  arguments.

Menglong Dong (10):
  net: ip: refactor fib_validate_source/__fib_validate_source
  net: ip: make fib_validate_source() return drop reason
  net: ip: make ip_route_input_mc() return drop reason
  net: ip: make ip_mc_validate_source() return drop reason
  net: ip: make ip_route_input_slow() return drop reasons
  net: ip: make ip_route_input_rcu() return drop reasons
  net: ip: make ip_route_input_noref() return drop reasons
  net: ip: make ip_route_input() return drop reasons
  net: ip: make ip_mkroute_input/__mkroute_input return drop reasons
  net: ip: make ip_route_use_hint() return drop reasons

 include/net/dropreason-core.h   |  26 ++++
 include/net/ip_fib.h            |  18 ++-
 include/net/route.h             |  34 ++---
 net/bridge/br_netfilter_hooks.c |  11 +-
 net/core/lwt_bpf.c              |   1 +
 net/ipv4/fib_frontend.c         |  81 ++++++------
 net/ipv4/icmp.c                 |   1 +
 net/ipv4/ip_fragment.c          |  12 +-
 net/ipv4/ip_input.c             |  20 ++-
 net/ipv4/route.c                | 212 ++++++++++++++++++--------------
 10 files changed, 245 insertions(+), 171 deletions(-)

-- 
2.39.5