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[net-next,0/6] net: use kfree_skb_reason() for ip/udp packet receive

Message ID 20220124131538.1453657-1-imagedong@tencent.com (mailing list archive)
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Series net: use kfree_skb_reason() for ip/udp packet receive | expand

Message

Menglong Dong Jan. 24, 2022, 1:15 p.m. UTC 
From: Menglong Dong <imagedong@tencent.com>

In this series patches, kfree_skb() is replaced with kfree_skb_reason()
during ipv4 and udp4 packet receiving path, and following drop reasons
are introduced:

SKB_DROP_REASON_NETFILTER_DROP
SKB_DROP_REASON_OTHERHOST
SKB_DROP_REASON_IP_CSUM
SKB_DROP_REASON_IP_INHDR
SKB_DROP_REASON_IP_ROUTE_INPUT
SKB_DROP_REASON_IP_RPFILTER
SKB_DROP_REASON_EARLY_DEMUX
SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST
SKB_DROP_REASON_XFRM_POLICY
SKB_DROP_REASON_IP_NOPROTO
SKB_DROP_REASON_UDP_FILTER
SKB_DROP_REASON_SOCKET_RCVBUFF
SKB_DROP_REASON_PROTO_MEM

TCP is more complex, so I left it in the next series.

I just figure out how __print_symbolic() works. It doesn't base on the
array index, but searching for symbols by loop. So I'm a little afraid
it's performance.


Menglong Dong (6):
  net: netfilter: use kfree_drop_reason() for NF_DROP
  net: ipv4: use kfree_skb_reason() in ip_rcv_core()
  net: ipv4: use kfree_skb_reason() in ip_rcv_finish_core()
  net: ipv4: use kfree_skb_reason() in ip_protocol_deliver_rcu()
  net: udp: use kfree_skb_reason() in udp_queue_rcv_one_skb()
  net: udp: use kfree_skb_reason() in __udp_queue_rcv_skb()

 include/linux/skbuff.h     | 16 +++++++++++++++
 include/trace/events/skb.h | 14 +++++++++++++
 net/ipv4/ip_input.c        | 42 +++++++++++++++++++++++++++-----------
 net/ipv4/udp.c             | 22 ++++++++++++++------
 net/netfilter/core.c       |  3 ++-
 5 files changed, 78 insertions(+), 19 deletions(-)