On 09/11/2018 09:00 PM, Alexei Starovoitov wrote:
On Tue, Sep 11, 2018 at 09:38:04PM +0200, Tushar Dave wrote:Add a sample program that shows how socksg program is used and attached to socket filter. The kernel sample program deals with struct scatterlist that is passed as bpf context. When run in server mode, the sample RDS program opens PF_RDS socket, attaches eBPF program to RDS socket which then uses bpf_msg_pull_data helper to inspect packet data contained in struct scatterlist and returns appropriate action code back to kernel. To ease testing, RDS client functionality is also added so that users can generate RDS packet. Server: [root@lab71 bpf]# ./rds_filter -s 192.168.3.71 -t tcp running server in a loop transport tcp server bound to address: 192.168.3.71 port 4000 server listening on 192.168.3.71 Client: [root@lab70 bpf]# ./rds_filter -s 192.168.3.71 -c 192.168.3.70 -t tcp transport tcp client bound to address: 192.168.3.70 port 25278 client sending 8192 byte message from 192.168.3.70 to 192.168.3.71 on port 25278 payload contains:30 31 32 33 34 35 36 37 38 39 ... Server output: 192.168.3.71 received a packet from 192.168.3.71 of len 8192 cmsg len 0, on port 25278 payload contains:30 31 32 33 34 35 36 37 38 39 ... server listening on 192.168.3.71 [root@lab71 tushar]# cat /sys/kernel/debug/tracing/trace_pipe <idle>-0 [038] ..s. 146.947362: 0: 30 31 32 <idle>-0 [038] ..s. 146.947364: 0: 33 34 35 Similarly specifying '-t ib' will run this on IB link. Signed-off-by: Tushar Dave <tushar.n.d...@oracle.com> Acked-by: Sowmini Varadhan <sowmini.varad...@oracle.com> --- samples/bpf/Makefile | 3 + samples/bpf/rds_filter_kern.c | 42 ++++++ samples/bpf/rds_filter_user.c | 339 ++++++++++++++++++++++++++++++++++++++++++please no samples. Add this as proper test to tools/testing/selftests/bpf that reports PASS/FAIL and can be run automatically. samples/bpf is effectively dead code.
Okay :( -Tushar
