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hwsim: add Prefix match rule support

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Hwsim rules now have a 'Prefix' property which will allow
matching frames based on their payload data.
This commit is contained in:
James Prestwood 2021-04-05 15:40:24 -07:00 committed by Denis Kenzior
parent 135ad0880e
commit 0756c301f3
1 changed files with 70 additions and 0 deletions
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70
tools/hwsim.c
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@ -114,6 +114,7 @@ enum hwsim_tx_control_flags {
#define IEEE80211_TX_RATE_TABLE_SIZE 4
#define HWSIM_DELAY_MIN_MS 1
#define HWSIM_MAX_PREFIX_LEN 128
struct hwsim_rule {
unsigned int id;
@ -127,6 +128,8 @@ struct hwsim_rule {
int priority;
int signal;
int delay;
uint8_t *prefix;
size_t prefix_len;
};
struct hwsim_support {
@ -1203,6 +1206,12 @@ static void process_rules(const struct radio_info_rec *src_radio,
if (rule->frequency && rule->frequency != frame->frequency)
continue;
if (rule->prefix && frame->payload_len >= rule->prefix_len) {
if (memcmp(rule->prefix, frame->payload,
rule->prefix_len) != 0)
continue;
}
/* Rule deemed to match frame, apply any changes */
if (rule->signal)
@ -2025,6 +2034,10 @@ static struct l_dbus_message *rule_remove(struct l_dbus *dbus,
path = rule_get_path(rule);
l_queue_remove(rules, rule);
if (rule->prefix)
l_free(rule->prefix);
l_free(rule);
l_dbus_unregister_object(dbus, path);
@ -2303,6 +2316,59 @@ static struct l_dbus_message *rule_property_set_delay(
return l_dbus_message_new_method_return(message);
}
static bool rule_property_get_prefix(struct l_dbus *dbus,
struct l_dbus_message *message,
struct l_dbus_message_builder *builder,
void *user_data)
{
struct hwsim_rule *rule = user_data;
size_t i;
l_dbus_message_builder_enter_array(builder, "y");
for (i = 0; i < rule->prefix_len; i++)
l_dbus_message_builder_append_basic(builder, 'y',
rule->prefix + i);
l_dbus_message_builder_leave_array(builder);
return true;
}
static struct l_dbus_message *rule_property_set_prefix(
struct l_dbus *dbus,
struct l_dbus_message *message,
struct l_dbus_message_iter *new_value,
l_dbus_property_complete_cb_t complete,
void *user_data)
{
struct hwsim_rule *rule = user_data;
struct l_dbus_message_iter iter;
const uint8_t *prefix;
uint32_t len;
if (!l_dbus_message_iter_get_variant(new_value, "ay", &iter))
goto invalid_args;
if (!l_dbus_message_iter_get_fixed_array(&iter,
(const void **)&prefix, &len))
goto invalid_args;
if (len > HWSIM_MAX_PREFIX_LEN)
goto invalid_args;
if (rule->prefix)
l_free(rule->prefix);
rule->prefix = l_memdup(prefix, len);
rule->prefix_len = len;
return l_dbus_message_new_method_return(message);
invalid_args:
return dbus_error_invalid_args(message);
}
static void setup_rule_interface(struct l_dbus_interface *interface)
{
l_dbus_interface_method(interface, "Remove", 0, rule_remove, "", "");
@ -2339,6 +2405,10 @@ static void setup_rule_interface(struct l_dbus_interface *interface)
L_DBUS_PROPERTY_FLAG_AUTO_EMIT, "u",
rule_property_get_delay,
rule_property_set_delay);
l_dbus_interface_property(interface, "Prefix",
L_DBUS_PROPERTY_FLAG_AUTO_EMIT, "ay",
rule_property_get_prefix,
rule_property_set_prefix);
}
static void request_name_callback(struct l_dbus *dbus, bool success,