Currently 5-tuple(sip+dip+sport+dport+proto) can't identify a
uniq connection because there may be multi net namespace.
For example, there may be a chance that netns a and netns b all
listen on 127.0.0.1:8080 and the client with same port 40782
connect to them. Without netns number, sock ops program
can't distinguish them.
Using bpf_get_netns_id helpers to get current connection
netns number to distinguish connections.
Changes in v3:
- rename sock_ops_get_netns to get_netns_id
Changes in v2:
- Return u64 instead of u32 for sock_ops_get_netns
- Fix build bug when CONFIG_NET_NS not set
- Add selftest for sock_ops_get_netns
Lingpeng Chen (3):
bpf: Add get_netns_id helper function for sock_ops
bpf: Sync uapi bpf.h to tools/
selftests/bpf: add selftest for get_netns_id helper
include/uapi/linux/bpf.h | 9 +++-
net/core/filter.c | 20 ++++++++
tools/include/uapi/linux/bpf.h | 9 +++-
.../selftests/bpf/progs/test_tcpbpf_kern.c | 11 +++++
.../testing/selftests/bpf/test_tcpbpf_user.c | 46 ++++++++++++++++++-
5 files changed, 92 insertions(+), 3 deletions(-)
base-commit bb6d3fb354c5 ("Linux 5.6-rc1")
--
2.20.1
