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  1. 03 6月, 2014 1 次提交
    • C
      net: filter: fix length calculation in BPF testsuite · e9d94504
      由 Chema Gonzalez 提交于 
      The current probe_filter_length() (the function that calculates the
length of a test BPF filter) behavior is to declare the end of the
filter as soon as it finds {0, *, *, 0}. This is actually a valid
insn ("ld #0"), so any filter with includes "BPF_STMT(BPF_LD | BPF_IMM, 0)"
fails (its length is cut short).

We are changing probe_filter_length() so as to start from the end, and
declare the end of the filter as the first instruction which is not
{0, *, *, 0}. This solution produces a simpler patch than the
alternative of using an explicit end-of-filter mark. It is technically
incorrect if your filter ends up with "ld #0", but that should not
happen anyway.

We also add a new test (LD_IMM_0) that includes ld #0 (does not work
without this patch).
Signed-off-by: NChema Gonzalez <chema@google.com>
Acked-by: NDaniel Borkmann <dborkman@redhat.com>
Acked-by: NAlexei Starovoitov <ast@plumgrid.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      e9d94504
  3. 02 6月, 2014 2 次提交
  5. 31 5月, 2014 2 次提交
  7. 24 5月, 2014 4 次提交
  9. 22 5月, 2014 1 次提交
    • A
      net: filter: cleanup invocation of internal BPF · 5fe821a9
      由 Alexei Starovoitov 提交于 
      Kernel API for classic BPF socket filters is:

sk_unattached_filter_create() - validate classic BPF, convert, JIT
SK_RUN_FILTER() - run it
sk_unattached_filter_destroy() - destroy socket filter

Cleanup internal BPF kernel API as following:

sk_filter_select_runtime() - final step of internal BPF creation.
  Try to JIT internal BPF program, if JIT is not available select interpreter
SK_RUN_FILTER() - run it
sk_filter_free() - free internal BPF program

Disallow direct calls to BPF interpreter. Execution of the BPF program should
be done with SK_RUN_FILTER() macro.

Example of internal BPF create, run, destroy:

  struct sk_filter *fp;

  fp = kzalloc(sk_filter_size(prog_len), GFP_KERNEL);
  memcpy(fp->insni, prog, prog_len * sizeof(fp->insni[0]));
  fp->len = prog_len;

  sk_filter_select_runtime(fp);

  SK_RUN_FILTER(fp, ctx);

  sk_filter_free(fp);

Sockets, seccomp, testsuite, tracing are using different ways to populate
sk_filter, so first steps of program creation are not common.
Signed-off-by: NAlexei Starovoitov <ast@plumgrid.com>
Acked-by: NDaniel Borkmann <dborkman@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      5fe821a9
  11. 12 5月, 2014 2 次提交
    • A
      net: filter: additional BPF tests · 9def624a
      由 Alexei Starovoitov 提交于 
      All tests should pass with and without JIT.

Example output:
test_bpf: #0 TAX 35 16 16 PASS
test_bpf: #1 TXA 7 7 7 PASS
test_bpf: #2 ADD_SUB_MUL_K 10 PASS
test_bpf: #3 DIV_KX 33 PASS
test_bpf: #4 AND_OR_LSH_K 10 10 PASS
test_bpf: #5 LD_IND 8 8 8 PASS
test_bpf: #6 LD_ABS 8 8 8 PASS
test_bpf: #7 LD_ABS_LL 13 14 PASS
test_bpf: #8 LD_IND_LL 12 12 12 PASS
test_bpf: #9 LD_ABS_NET 10 12 PASS
test_bpf: #10 LD_IND_NET 11 12 12 PASS
...

Numbers are times in nsec per filter for given input data.
Signed-off-by: NAlexei Starovoitov <ast@plumgrid.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      9def624a
    • A
      net: filter: BPF testsuite · 64a8946b
      由 Alexei Starovoitov 提交于 
      The testsuite covers classic and internal BPF instructions.
It is particularly useful for JIT compiler developers.
Adds to "net" selftest target.

The testsuite can be used as a set of micro-benchmarks.
It measures execution time of each BPF program in nsec.

This patch adds core framework.
Signed-off-by: NAlexei Starovoitov <ast@plumgrid.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      64a8946b