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* samples/bpf: fix sockex2 exampleAlexei Starovoitov2016-11-241-1/+1
| | | | | | | | | | | | | | since llvm commit "Do not expand UNDEF SDNode during insn selection lowering" llvm will generate code that uses uninitialized registers for cases where C code is actually uses uninitialized data. So this sockex2 example is technically broken. Fix it by initializing on the stack variable fully. Also increase verifier buffer limit, since verifier output may not fit in 64k for this sockex2 code depending on llvm version. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
* bpf samples: fix compiler errors with sockex2 and sockex3Naveen N. Rao2016-09-271-5/+5
| | | | | | | | | | These samples fail to compile as 'struct flow_keys' conflicts with definition in net/flow_dissector.h. Fix the same by renaming the structure used in the sample. Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* samples: bpf: add skb->field examples and testsAlexei Starovoitov2015-03-151-10/+16
| | | | | | | | | - modify sockex1 example to count number of bytes in outgoing packets - modify sockex2 example to count number of bytes and packets per flow - add 4 stress tests that exercise 'skb->field' code path of verifier Signed-off-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* samples: bpf: large eBPF program in CAlexei Starovoitov2014-12-051-0/+215
sockex2_kern.c is purposefully large eBPF program in C. llvm compiles ~200 lines of C code into ~300 eBPF instructions. It's similar to __skb_flow_dissect() to demonstrate that complex packet parsing can be done by eBPF. Then it uses (struct flow_keys)->dst IP address (or hash of ipv6 dst) to keep stats of number of packets per IP. User space loads eBPF program, attaches it to loopback interface and prints dest_ip->#packets stats every second. Usage: $sudo samples/bpf/sockex2 ip 127.0.0.1 count 19 ip 127.0.0.1 count 178115 ip 127.0.0.1 count 369437 ip 127.0.0.1 count 559841 ip 127.0.0.1 count 750539 Signed-off-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>