In this series, we mainly add some skb drop reasons to the input path of ip routing. The function ip_route_input_noref() is used commonly, and its return value is used by the caller sometimes. So, it's not easy to make it return skb drop reasons. Instead, we add the pointer of the drop reason to the function arguments of it. And we do the same things to ip_route_input_rcu() and ip_route_input_slow(). The errno from fib_validate_source() is -EINVAL or -EXDEV, and -EXDEV is used in ip_rcv_finish_core() to increase the LINUX_MIB_IPRPFILTER. For this case, we can check it by "drop_reason == SKB_DROP_REASON_IP_RPFILTER" instead. Therefore, we can make fib_validate_source() return -reason. Meanwhile, we make ip_route_input_mc() and ip_mc_validate_source() return drop reason. Following new skb drop reasons are added: SKB_DROP_REASON_IP_LOCAL_SOURCE SKB_DROP_REASON_IP_INVALID_SOURCE SKB_DROP_REASON_IP_INVALID_DEST SKB_DROP_REASON_IP_LOCALNET Menglong Dong (7): net: ip: add drop reason to ip_route_input_noref() net: ip: add drop reason to ip_route_input_rcu() net: ip: add drop reason to ip_route_input_slow() 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: fix typo in the doc of SKB_DROP_REASON_IP_INNOROUTES drivers/net/ipvlan/ipvlan_l3s.c | 2 +- include/net/dropreason-core.h | 21 +++++- include/net/route.h | 12 ++-- net/core/lwt_bpf.c | 2 +- net/ipv4/arp.c | 2 +- net/ipv4/fib_frontend.c | 19 ++++-- net/ipv4/ip_fragment.c | 2 +- net/ipv4/ip_input.c | 11 ++-- net/ipv4/route.c | 111 +++++++++++++++++++++----------- net/ipv4/xfrm4_input.c | 2 +- net/ipv4/xfrm4_protocol.c | 2 +- 11 files changed, 122 insertions(+), 64 deletions(-) -- 2.39.5
