From: Menglong Dong <imagedong@xxxxxxxxxxx>
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_SOCKET_FILTER
SKB_DROP_REASON_NETFILTER_DROP
SKB_DROP_REASON_OTHERHOST
SKB_DROP_REASON_IP_CSUM
SKB_DROP_REASON_IP_INHDR
SKB_DROP_REASON_IP_RPFILTER
SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST
SKB_DROP_REASON_XFRM_POLICY
SKB_DROP_REASON_IP_NOPROTO
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.
Changes since v2:
- use SKB_DROP_REASON_PKT_TOO_SMALL for a path in ip_rcv_core()
Changes since v1:
- add document for all drop reasons, as David advised
- remove unreleated cleanup
- remove EARLY_DEMUX and IP_ROUTE_INPUT drop reason
- replace {UDP, TCP}_FILTER with SOCKET_FILTER
Menglong Dong (7):
net: skb_drop_reason: add document for drop reasons
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 | 38 ++++++++++++++++++++++++++++++++------
include/trace/events/skb.h | 11 +++++++++++
net/ipv4/ip_input.c | 31 +++++++++++++++++++++++--------
net/ipv4/udp.c | 22 ++++++++++++++++------
net/netfilter/core.c | 3 ++-
5 files changed, 84 insertions(+), 21 deletions(-)
--
2.27.0
