In this series, we mainly add some skb drop reasons to the input path of ip routing, and we make the following functions return drop reasons: fib_validate_source() ip_route_input_mc() ip_mc_validate_source() ip_route_input_slow() ip_route_input_rcu() ip_route_input_noref() ip_route_input() ip_mkroute_input() __mkroute_input() ip_route_use_hint() In order to make fib_validate_source() return drop reasons, we do some refactoring to fib_validate_source() and __fib_validate_source(). The main idea is to combine fib_validate_source() into __fib_validate_source() and make fib_validate_source() an inline call to __fib_validate_source() in the 1st patch. And following new skb drop reasons are added: SKB_DROP_REASON_IP_LOCAL_SOURCE SKB_DROP_REASON_IP_INVALID_SOURCE SKB_DROP_REASON_IP_LOCALNET SKB_DROP_REASON_IP_INVALID_DEST Changes since v2: - refactor fib_validate_source and __fib_validate_source to make fib_validate_source return drop reasons - add the 9th and 10th patches to make this series cover the input route code path Changes since v1: - make ip_route_input_noref/ip_route_input_rcu/ip_route_input_slow return drop reasons, instead of passing a local variable to their function arguments. Menglong Dong (10): net: ip: refactor fib_validate_source/__fib_validate_source 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: make ip_route_input_slow() return drop reasons net: ip: make ip_route_input_rcu() return drop reasons net: ip: make ip_route_input_noref() return drop reasons net: ip: make ip_route_input() return drop reasons net: ip: make ip_mkroute_input/__mkroute_input return drop reasons net: ip: make ip_route_use_hint() return drop reasons include/net/dropreason-core.h | 26 ++++ include/net/ip_fib.h | 18 ++- include/net/route.h | 34 ++--- net/bridge/br_netfilter_hooks.c | 11 +- net/core/lwt_bpf.c | 1 + net/ipv4/fib_frontend.c | 81 ++++++------ net/ipv4/icmp.c | 1 + net/ipv4/ip_fragment.c | 12 +- net/ipv4/ip_input.c | 20 ++- net/ipv4/route.c | 212 ++++++++++++++++++-------------- 10 files changed, 245 insertions(+), 171 deletions(-) -- 2.39.5
