tc: simple: don't hardcode the control action

the following TDC test case:

 b776 - Replace simple action with invalid goto chain control

checks if the kernel correctly validates the 'goto chain' control action,
when it is specified in 'act_simple' rules. The test systematically fails
because the control action is hardcoded in parse_simple(), i.e. it is not
parsed by command line arguments, so its value is constantly TC_ACT_PIPE.
Because of that, the following command:

 # tc action add action simple sdata "test" drop index 7

installs an 'act_simple' rule that never drops packets, and whose 'index'
is the first IDR available, plus an 'act_gact' rule with 'index' equal to
7, that drops packets.

Use parse_action_control_dflt(), like we did on many other TC actions, to
make the control action configurable also with 'act_simple'. The expected
results of test b776 are summarized below:

 iproute2
   v       kernel->| 5.1-rc2 (and previous)  | 5.1-rc3 (and subsequent)
 ------------------+-------------------------+-------------------------
 5.1.0             | FAIL (bad IDR)          | FAIL (bad IDR)
 5.1.0(patched)    | FAIL (no rule/bad sdata)| PASS

Changes since v1:
 - reword commit message, thanks Stephen Hemminger

Fixes: 087f46ee4ebd ("tc: introduce simple action")
CC: Andrea Claudi <aclaudi@redhat.com>
CC: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>

diff --git a/tc/m_simple.c b/tc/m_simple.c
index 886606f9f8b4e754c035d3c74932f753126abd89..e3c8a60ff64a1483e553f57cbe6464419fa44c00 100644 (file)
--- a/tc/m_simple.c
+++ b/tc/m_simple.c
@@ -119,6 +119,9 @@ parse_simple(struct action_util *a, int *argc_p, char ***argv_p, int tca_id,
                }
        }
 
+       parse_action_control_dflt(&argc, &argv, &sel.action, false,
+                                 TC_ACT_PIPE);
+
        if (argc) {
                if (matches(*argv, "index") == 0) {
                        NEXT_ARG();
@@ -144,8 +147,6 @@ parse_simple(struct action_util *a, int *argc_p, char ***argv_p, int tca_id,
                return -1;
        }
 
-       sel.action = TC_ACT_PIPE;
-
        tail = addattr_nest(n, MAX_MSG, tca_id);
        addattr_l(n, MAX_MSG, TCA_DEF_PARMS, &sel, sizeof(sel));
        if (simpdata)