/* Flow entry (a) matches flow entry (b) non-strictly if (a) matches whenever (b) matches.
* Thus, flow (a) must not have more match fields than (b) and all match fields in (a) must
* be equal or narrower in (b).
* NOTE: Handling of bitmasked fields is not specified. In this implementation
* a masked field of (a) matches the field of (b) if all masked bits of (b) are
* also masked in (a), and for each unmasked bits of (b) , the bit is either
* masked in (a), or is set to the same value in both matches.
*
*/
bool
match_std_nonstrict(struct ofl_match *a, struct ofl_match *b, struct ofl_exp *exp)
{
struct ofl_match_tlv *flow_mod_match;
struct ofl_match_tlv *flow_entry_match;
int field_len;
uint8_t *flow_mod_val, *flow_mod_mask=0;
uint8_t *flow_entry_val, *flow_entry_mask=0;
bool has_mask;
/* Flow a is fully wildcarded */
if (!a->header.length)
return true;
/* Loop through the match fields in flow entry a */
HMAP_FOR_EACH(flow_mod_match, struct ofl_match_tlv, hmap_node, &a->match_fields)
{
/* Check presence of match field in flow entry */
flow_entry_match = oxm_match_lookup(flow_mod_match->header, b);
if (!flow_entry_match) {
return false;
}
/* At this point match length and has_mask are equal */
has_mask = OXM_HASMASK(flow_mod_match->header);
flow_mod_val = flow_mod_match->value;
flow_entry_val = flow_entry_match->value;
switch (OXM_VENDOR(flow_mod_match->header))
{
case (OFPXMC_OPENFLOW_BASIC):
field_len = OXM_LENGTH(flow_mod_match->header);
if (has_mask)
{
field_len /= 2;
flow_mod_mask = flow_mod_match->value + field_len;
flow_entry_mask = flow_entry_match->value + field_len;
}
break;
case (OFPXMC_EXPERIMENTER):
if (exp == NULL || exp->field == NULL || exp->field->match_std == NULL) {
VLOG_WARN(LOG_MODULE,"Received match is experimental, but no callback was given.");
ofl_error(OFPET_BAD_MATCH, OFPBMC_BAD_TYPE);
}
exp->field->match_std(flow_mod_match, flow_entry_match, &field_len, &flow_mod_val, &flow_entry_val, &flow_mod_mask, &flow_entry_mask);
break;
default:
break;
}
switch (field_len) {
case 1:
if (has_mask) {
if (!nonstrict_mask8(flow_mod_val, flow_entry_val, flow_mod_mask, flow_entry_mask))
return false;
}
else {
if (!match_8(flow_mod_val, flow_entry_val))
return false;
}
break;
case 2:
if (has_mask) {
if (!nonstrict_mask16(flow_mod_val, flow_entry_val, flow_mod_mask, flow_entry_mask))
return false;
}
else {
if (!match_16(flow_mod_val, flow_entry_val))
return false;
}
break;
case 3:
if (has_mask) {
if (!nonstrict_mask24(flow_mod_val, flow_entry_val, flow_mod_mask, flow_entry_mask))
return false;
}
else {
if (!match_24(flow_mod_val, flow_entry_val))
return false;
}
break;
case 4:
if (has_mask) {
if (!nonstrict_mask32(flow_mod_val, flow_entry_val, flow_mod_mask, flow_entry_mask))
return false;
}
else {
if (!match_32(flow_mod_val, flow_entry_val))
return false;
}
break;
case 6:
if (has_mask) {
if (!nonstrict_mask48(flow_mod_val, flow_entry_val, flow_mod_mask, flow_entry_mask))
return false;
}
else {
if (!match_48(flow_mod_val, flow_entry_val))
return false;
}
break;
case 8:
if (has_mask) {
if (!nonstrict_mask64(flow_mod_val, flow_entry_val, flow_mod_mask, flow_entry_mask))
return false;
}
else {
if (!match_64(flow_mod_val, flow_entry_val))
return false;
}
break;
case 16:
if (has_mask) {
if (!nonstrict_mask128(flow_mod_val, flow_entry_val, flow_mod_mask, flow_entry_mask))
return false;
}
else {
if (!match_128(flow_mod_val, flow_entry_val))
return false;
}
break;
default:
/* Should never happen */
break;
} /* switch (field_len) */
} /* HMAP_FOR_EACH */
/* If we get here, all match fields in flow a were equal or wider than the ones in b */
/* It doesn't matter if there are further fields in b */
return true;
}
/* Flow entry (a) matches flow entry (b) non-strictly if (a) matches whenever (b) matches.
* Thus, flow (a) must not have more match fields than (b) and all match fields in (a) must
* be equal or narrower in (b).
* NOTE: Handling of bitmasked fields is not specified. In this implementation
* a masked field of (a) matches the field of (b) if all masked bits of (b) are
* also masked in (a), and for each unmasked bits of (b) , the bit is either
* masked in (a), or is set to the same value in both matches.
*
*/
bool
match_std_nonstrict(struct ofl_match *a, struct ofl_match *b)
{
struct ofl_match_tlv *flow_mod_match;
struct ofl_match_tlv *flow_entry_match;
int field_len;
uint8_t *flow_mod_val, *flow_mod_mask=0;
uint8_t *flow_entry_val, *flow_entry_mask=0;
bool has_mask;
/* Flow a is fully wildcarded */
if (!a->header.length)
return true;
/* Loop through the match fields in flow entry a */
HMAP_FOR_EACH(flow_mod_match, struct ofl_match_tlv, hmap_node, &a->match_fields)
{
/* Check presence of match field in flow entry */
flow_entry_match = oxm_match_lookup(flow_mod_match->header, b);
if (!flow_entry_match) {
return false;
}
/* At this point match length and has_mask are equal */
has_mask = OXM_HASMASK(flow_mod_match->header);
field_len = OXM_LENGTH(flow_mod_match->header);
flow_mod_val = flow_mod_match->value;
flow_entry_val = flow_entry_match->value;
if (has_mask)
{
field_len /= 2;
flow_mod_mask = flow_mod_match->value + field_len;
flow_entry_mask = flow_entry_match->value + field_len;
}
switch (field_len) {
case 1:
if (has_mask) {
if (!nonstrict_mask8(flow_mod_val, flow_entry_val, flow_mod_mask, flow_entry_mask))
return false;
}
else {
if (!match_8(flow_mod_val, flow_entry_val))
return false;
}
break;
case 2:
if (has_mask) {
if (!nonstrict_mask16(flow_mod_val, flow_entry_val, flow_mod_mask, flow_entry_mask))
return false;
}
else {
if (!match_16(flow_mod_val, flow_entry_val))
return false;
}
break;
case 4:
if (has_mask) {
if (!nonstrict_mask32(flow_mod_val, flow_entry_val, flow_mod_mask, flow_entry_mask))
return false;
}
else {
if (!match_32(flow_mod_val, flow_entry_val))
return false;
}
break;
case 6:
if (has_mask) {
if (!nonstrict_mask48(flow_mod_val, flow_entry_val, flow_mod_mask, flow_entry_mask))
return false;
}
else {
if (!match_48(flow_mod_val, flow_entry_val))
return false;
}
break;
case 8:
if (has_mask) {
if (!nonstrict_mask64(flow_mod_val, flow_entry_val, flow_mod_mask, flow_entry_mask))
return false;
}
else {
if (!match_64(flow_mod_val, flow_entry_val))
return false;
}
break;
case 16:
if (has_mask) {
if (!nonstrict_mask128(flow_mod_val, flow_entry_val, flow_mod_mask, flow_entry_mask))
return false;
}
else {
if (!match_128(flow_mod_val, flow_entry_val))
return false;
}
break;
default:
/* Should never happen */
break;
} /* switch (field_len) */
} /* HMAP_FOR_EACH */
/* If we get here, all match fields in flow a were equal or wider than the ones in b */
/* It doesn't matter if there are further fields in b */
return true;
}
