[PATCH net-next v4 0/5] introduce drop reasons for cookie check

[Jason Xing <kerneljasonxing@gmail.com>]

From: Jason Xing <kernelxing@tencent.com>

When I was debugging the reason about why the skb should be dropped in
syn cookie mode, I found out that this NOT_SPECIFIED reason is too
general. Thus I decided to refine it.

Previously I submitted one patch series which is too large/risky, so I
split that one series into two seires. For another one, I will submit
later.

Summary
1. introduce all the dropreasons we need, [1/5] patch.
2. use new dropreasons in ipv4 cookie check, [2/5],[3/5] patch.
3. use new dropreasons ipv6 cookie check, [4/5],[5/5] patch.

v4:
Link: https://lore.kernel.org/netdev/20240212172302.3f95e454@kernel.org/
1. Fix misspelled name in Kdoc as suggested by Jakub.

v3:
Link: https://lore.kernel.org/all/CANn89iK40SoyJ8fS2U5kp3pDruo=zfQNPL-ppOF+LYaS9z-MVA@mail.gmail.com/
1. Split that patch into some smaller ones as suggested by Eric.

v2:
Link: https://lore.kernel.org/all/20240204104601.55760-1-kerneljasonxing@gmail.com/
1. change the title of 2/2 patch.
2. fix some warnings checkpatch tool showed before.
3. use return value instead of adding more parameters suggested by Eric.


Jason Xing (5):
  tcp: add dropreasons definitions and prepare for cookie check
  tcp: directly drop skb in cookie check for ipv4
  tcp: use drop reasons in cookie check for ipv4
  tcp: directly drop skb in cookie check for ipv6
  tcp: use drop reasons in cookie check for ipv6

 include/net/dropreason-core.h | 21 +++++++++++++++++++++
 net/ipv4/syncookies.c         | 20 ++++++++++++++++----
 net/ipv4/tcp_ipv4.c           |  2 +-
 net/ipv6/syncookies.c         | 18 +++++++++++++++---
 net/ipv6/tcp_ipv6.c           |  7 +++++--
 5 files changed, 58 insertions(+), 10 deletions(-)

-- 
2.37.3