/* Converts 'nam' into 'mp'. Returns 0 if successful, otherwise an
* OFPERR_*. */
enum ofperr
multipath_from_openflow(const struct nx_action_multipath *nam,
struct ofpact_multipath *mp)
{
uint32_t n_links = ntohs(nam->max_link) + 1;
size_t min_n_bits = log_2_ceil(n_links);
ofpact_init_MULTIPATH(mp);
mp->fields = ntohs(nam->fields);
mp->basis = ntohs(nam->basis);
mp->algorithm = ntohs(nam->algorithm);
mp->max_link = ntohs(nam->max_link);
mp->arg = ntohl(nam->arg);
mp->dst.field = mf_from_nxm_header(ntohl(nam->dst));
mp->dst.ofs = nxm_decode_ofs(nam->ofs_nbits);
mp->dst.n_bits = nxm_decode_n_bits(nam->ofs_nbits);
if (!flow_hash_fields_valid(mp->fields)) {
VLOG_WARN_RL(&rl, "unsupported fields %d", (int) mp->fields);
return OFPERR_OFPBAC_BAD_ARGUMENT;
} else if (mp->algorithm != NX_MP_ALG_MODULO_N
&& mp->algorithm != NX_MP_ALG_HASH_THRESHOLD
&& mp->algorithm != NX_MP_ALG_HRW
&& mp->algorithm != NX_MP_ALG_ITER_HASH) {
VLOG_WARN_RL(&rl, "unsupported algorithm %d", (int) mp->algorithm);
return OFPERR_OFPBAC_BAD_ARGUMENT;
} else if (mp->dst.n_bits < min_n_bits) {
VLOG_WARN_RL(&rl, "multipath action requires at least %zu bits for "
"%"PRIu32" links", min_n_bits, n_links);
return OFPERR_OFPBAC_BAD_ARGUMENT;
}
return multipath_check(mp, NULL);
}
/* Appends a human-readable representation of 'nab' to 's'. */
void
bundle_format(const struct nx_action_bundle *nab, struct ds *s)
{
const char *action, *fields, *algorithm, *slave_type;
size_t i;
fields = flow_hash_fields_to_str(ntohs(nab->fields));
switch (ntohs(nab->algorithm)) {
case NX_BD_ALG_HRW:
algorithm = "hrw";
break;
case NX_BD_ALG_ACTIVE_BACKUP:
algorithm = "active_backup";
break;
default:
algorithm = "<unknown>";
}
switch (ntohl(nab->slave_type)) {
case NXM_OF_IN_PORT:
slave_type = "ofport";
break;
default:
slave_type = "<unknown>";
}
switch (ntohs(nab->subtype)) {
case NXAST_BUNDLE:
action = "bundle";
break;
case NXAST_BUNDLE_LOAD:
action = "bundle_load";
break;
default:
NOT_REACHED();
}
ds_put_format(s, "%s(%s,%"PRIu16",%s,%s,", action, fields,
ntohs(nab->basis), algorithm, slave_type);
if (nab->subtype == htons(NXAST_BUNDLE_LOAD)) {
nxm_format_field_bits(s, ntohl(nab->dst),
nxm_decode_ofs(nab->ofs_nbits),
nxm_decode_n_bits(nab->ofs_nbits));
ds_put_cstr(s, ",");
}
ds_put_cstr(s, "slaves:");
for (i = 0; i < ntohs(nab->n_slaves); i++) {
if (i) {
ds_put_cstr(s, ",");
}
ds_put_format(s, "%"PRIu16, bundle_get_slave(nab, i));
}
ds_put_cstr(s, ")");
}
/* Checks that 'nab' specifies a bundle action which is supported by this
* bundle module. Uses the 'max_ports' parameter to validate each port using
* ofputil_check_output_port(). Returns 0 if 'nab' is supported, otherwise an
* OFPERR_* error code. */
enum ofperr
bundle_from_openflow(const struct nx_action_bundle *nab,
struct ofpbuf *ofpacts)
{
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
struct ofpact_bundle *bundle;
uint16_t subtype;
uint32_t slave_type;
size_t slaves_size, i;
enum ofperr error;
bundle = ofpact_put_BUNDLE(ofpacts);
subtype = ntohs(nab->subtype);
bundle->n_slaves = ntohs(nab->n_slaves);
bundle->basis = ntohs(nab->basis);
bundle->fields = ntohs(nab->fields);
bundle->algorithm = ntohs(nab->algorithm);
slave_type = ntohl(nab->slave_type);
slaves_size = ntohs(nab->len) - sizeof *nab;
error = OFPERR_OFPBAC_BAD_ARGUMENT;
if (!flow_hash_fields_valid(bundle->fields)) {
VLOG_WARN_RL(&rl, "unsupported fields %d", (int) bundle->fields);
} else if (bundle->n_slaves > BUNDLE_MAX_SLAVES) {
VLOG_WARN_RL(&rl, "too may slaves");
} else if (bundle->algorithm != NX_BD_ALG_HRW
&& bundle->algorithm != NX_BD_ALG_ACTIVE_BACKUP) {
VLOG_WARN_RL(&rl, "unsupported algorithm %d", (int) bundle->algorithm);
} else if (slave_type != NXM_OF_IN_PORT) {
VLOG_WARN_RL(&rl, "unsupported slave type %"PRIu16, slave_type);
} else {
error = 0;
}
if (!is_all_zeros(nab->zero, sizeof nab->zero)) {
VLOG_WARN_RL(&rl, "reserved field is nonzero");
error = OFPERR_OFPBAC_BAD_ARGUMENT;
}
if (subtype == NXAST_BUNDLE && (nab->ofs_nbits || nab->dst)) {
VLOG_WARN_RL(&rl, "bundle action has nonzero reserved fields");
error = OFPERR_OFPBAC_BAD_ARGUMENT;
}
if (subtype == NXAST_BUNDLE_LOAD) {
bundle->dst.field = mf_from_nxm_header(ntohl(nab->dst));
bundle->dst.ofs = nxm_decode_ofs(nab->ofs_nbits);
bundle->dst.n_bits = nxm_decode_n_bits(nab->ofs_nbits);
if (bundle->dst.n_bits < 16) {
VLOG_WARN_RL(&rl, "bundle_load action requires at least 16 bit "
"destination.");
error = OFPERR_OFPBAC_BAD_ARGUMENT;
}
}
if (slaves_size < bundle->n_slaves * sizeof(ovs_be16)) {
VLOG_WARN_RL(&rl, "Nicira action %"PRIu16" only has %"PRIuSIZE" bytes "
"allocated for slaves. %"PRIuSIZE" bytes are required for "
"%"PRIu16" slaves.", subtype, slaves_size,
bundle->n_slaves * sizeof(ovs_be16), bundle->n_slaves);
error = OFPERR_OFPBAC_BAD_LEN;
}
for (i = 0; i < bundle->n_slaves; i++) {
uint16_t ofp_port = ntohs(((ovs_be16 *)(nab + 1))[i]);
ofpbuf_put(ofpacts, &ofp_port, sizeof ofp_port);
}
bundle = ofpacts->l2;
ofpact_update_len(ofpacts, &bundle->ofpact);
if (!error) {
error = bundle_check(bundle, OFPP_MAX, NULL);
}
return error;
}
/* Checks that 'nab' specifies a bundle action which is supported by this
* bundle module. Uses the 'max_ports' parameter to validate each port using
* ofputil_check_output_port(). Returns 0 if 'nab' is supported, otherwise an
* OpenFlow error code (as returned by ofp_mkerr()). */
int
bundle_check(const struct nx_action_bundle *nab, int max_ports,
const struct flow *flow)
{
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
uint16_t n_slaves, fields, algorithm, subtype;
uint32_t slave_type;
size_t slaves_size, i;
int error;
subtype = ntohs(nab->subtype);
n_slaves = ntohs(nab->n_slaves);
fields = ntohs(nab->fields);
algorithm = ntohs(nab->algorithm);
slave_type = ntohl(nab->slave_type);
slaves_size = ntohs(nab->len) - sizeof *nab;
error = ofp_mkerr(OFPET_BAD_ACTION, OFPBAC_BAD_ARGUMENT);
if (!flow_hash_fields_valid(fields)) {
VLOG_WARN_RL(&rl, "unsupported fields %"PRIu16, fields);
} else if (n_slaves > BUNDLE_MAX_SLAVES) {
VLOG_WARN_RL(&rl, "too may slaves");
} else if (algorithm != NX_BD_ALG_HRW
&& algorithm != NX_BD_ALG_ACTIVE_BACKUP) {
VLOG_WARN_RL(&rl, "unsupported algorithm %"PRIu16, algorithm);
} else if (slave_type != NXM_OF_IN_PORT) {
VLOG_WARN_RL(&rl, "unsupported slave type %"PRIu16, slave_type);
} else {
error = 0;
}
for (i = 0; i < sizeof(nab->zero); i++) {
if (nab->zero[i]) {
VLOG_WARN_RL(&rl, "reserved field is nonzero");
error = ofp_mkerr(OFPET_BAD_ACTION, OFPBAC_BAD_ARGUMENT);
}
}
if (subtype == NXAST_BUNDLE && (nab->ofs_nbits || nab->dst)) {
VLOG_WARN_RL(&rl, "bundle action has nonzero reserved fields");
error = ofp_mkerr(OFPET_BAD_ACTION, OFPBAC_BAD_ARGUMENT);
}
if (subtype == NXAST_BUNDLE_LOAD) {
int ofs = nxm_decode_ofs(nab->ofs_nbits);
int n_bits = nxm_decode_n_bits(nab->ofs_nbits);
if (n_bits < 16) {
VLOG_WARN_RL(&rl, "bundle_load action requires at least 16 bit "
"destination.");
error = ofp_mkerr(OFPET_BAD_ACTION, OFPBAC_BAD_ARGUMENT);
} else {
error = nxm_dst_check(nab->dst, ofs, n_bits, flow) || error;
}
}
if (slaves_size < n_slaves * sizeof(ovs_be16)) {
VLOG_WARN_RL(&rl, "Nicira action %"PRIu16" only has %zu bytes "
"allocated for slaves. %zu bytes are required for "
"%"PRIu16" slaves.", subtype, slaves_size,
n_slaves * sizeof(ovs_be16), n_slaves);
error = ofp_mkerr(OFPET_BAD_ACTION, OFPBAC_BAD_LEN);
}
for (i = 0; i < n_slaves; i++) {
uint16_t ofp_port = bundle_get_slave(nab, i);
int ofputil_error = ofputil_check_output_port(ofp_port, max_ports);
if (ofputil_error) {
VLOG_WARN_RL(&rl, "invalid slave %"PRIu16, ofp_port);
error = ofputil_error;
}
/* Controller slaves are unsupported due to the lack of a max_len
* argument. This may or may not change in the future. There doesn't
* seem to be a real-world use-case for supporting it. */
if (ofp_port == OFPP_CONTROLLER) {
VLOG_WARN_RL(&rl, "unsupported controller slave");
error = ofp_mkerr(OFPET_BAD_ACTION, OFPBAC_BAD_OUT_PORT);
}
}
return error;
}
