Messages in this thread | | | From | menglong8.dong@gmail ... | Subject | [PATCH net-next 0/2] net: tcp: add skb drop reasons to connect request | Date | Tue, 26 Apr 2022 16:07:07 +0800 |
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From: Menglong Dong <imagedong@tencent.com>
Seems now the reasons of skb drop in TCP layer are almost supported, except the path of connect requesting. So let's just finish it.
The TCP connect requesting is processed by 'inet_csk(sk)->icsk_af_ops->conn_request()'. Yeah, it's a function pointer, so it's not easy to add function param to it. Luckily, it's return value can be reused. For now, 0 means a call of 'consume_skb()' and -1 means 'kfree_skb()', with a RESET be send. Therefore, we can free skb with 'kfree_skb_reason()' in 'conn_request()' and return 1. While 1 is returned, we do nothing outside. This work is done in the 1th patch.
And in the 2th patch, skb drop reasons are added to route_req() in struct tcp_request_sock_ops by adding a function param to it.
Following new skb drop reasons are added:
SKB_DROP_REASON_LISTENOVERFLOWS SKB_DROP_REASON_TCP_REQQFULLDROP SKB_DROP_REASON_SECURITY
Menglong Dong (2): net: add skb drop reasons to inet connect request net: tcp: add skb drop reasons to route_req()
include/linux/skbuff.h | 5 +++++ include/net/tcp.h | 3 ++- include/trace/events/skb.h | 3 +++ net/dccp/input.c | 12 +++++------- net/ipv4/tcp_input.c | 23 ++++++++++++++--------- net/ipv4/tcp_ipv4.c | 17 +++++++++++++---- net/ipv6/tcp_ipv6.c | 14 +++++++++++--- net/mptcp/subflow.c | 10 ++++++---- 8 files changed, 59 insertions(+), 28 deletions(-)
-- 2.36.0
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