From: Mingyi Zhang <zhangmingyi5@xxxxxxxxxx> We want call bpf_setsockopt to replace the kernel module in the TCP_ULP case. The purpose is to customize the behavior in connect and sendmsg after the user-defined ko file is loaded. We have an open source community project kmesh (kmesh.net). Based on this, we refer to some processes of tcp fastopen to implement delayed connet and perform HTTP DNAT when sendmsg.In this case, we need to parse HTTP packets in the bpf program and set TCP_ULP for the specified socket. Note that tcp_getsockopt and tcp_setsockopt support TCP_ULP, while bpf_getsockopt and bpf_setsockopt do not support TCP_ULP. I'm not sure why there is such a difference, but I noticed that tcp_setsockopt is called in bpf_setsockopt.I think we can add the handling of this case. Change list: - v1 -> v2: - modified the do_tcp_setsockopt(TCP_ULP) process by referring to section do_tcp_setsockopt(TCP_CONGESTION), avoid sleep - The selftest case is modified. An independent file is selected for the test to avoid affecting the original file in setget_sockopt.c - fixed some formatting errors, such as Signed and Subject Revisions: - v1 https://lore.kernel.org/bpf/20250127090724.3168791-1-zhangmingyi5@xxxxxxxxxx/ Mingyi Zhang (2): bpf-next: Introduced to support the ULP to get or set sockets bpf-next: selftest for TCP_ULP in bpf_setsockopt include/net/tcp.h | 2 +- net/core/filter.c | 1 + net/ipv4/tcp.c | 2 +- net/ipv4/tcp_ulp.c | 28 +++---- net/mptcp/subflow.c | 2 +- .../bpf/prog_tests/setget_sockopt_tcp_ulp.c | 78 +++++++++++++++++++ .../bpf/progs/setget_sockopt_tcp_ulp.c | 33 ++++++++ 7 files changed, 130 insertions(+), 16 deletions(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/setget_sockopt_tcp_ulp.c create mode 100644 tools/testing/selftests/bpf/progs/setget_sockopt_tcp_ulp.c -- 2.43.0
