2012-01-12 15:48:19 -08:00
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/* Copyright (c) 2011, 2012 Nicira Networks.
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2011-06-10 17:45:45 -07:00
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <config.h>
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#include "bundle.h"
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#include <arpa/inet.h>
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#include <inttypes.h>
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#include "dynamic-string.h"
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#include "multipath.h"
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#include "nx-match.h"
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#include "ofpbuf.h"
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2012-01-12 15:48:19 -08:00
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#include "ofp-errors.h"
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2011-06-10 17:45:45 -07:00
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#include "ofp-util.h"
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#include "openflow/nicira-ext.h"
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#include "vlog.h"
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#define BUNDLE_MAX_SLAVES 2048
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VLOG_DEFINE_THIS_MODULE(bundle);
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2011-07-18 13:50:26 -07:00
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static uint16_t
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execute_ab(const struct nx_action_bundle *nab,
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bool (*slave_enabled)(uint16_t ofp_port, void *aux), void *aux)
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{
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size_t i;
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for (i = 0; i < ntohs(nab->n_slaves); i++) {
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uint16_t slave = bundle_get_slave(nab, i);
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if (slave_enabled(slave, aux)) {
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return slave;
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}
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}
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return OFPP_NONE;
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}
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static uint16_t
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execute_hrw(const struct nx_action_bundle *nab, const struct flow *flow,
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bool (*slave_enabled)(uint16_t ofp_port, void *aux), void *aux)
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2011-06-10 17:45:45 -07:00
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{
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uint32_t flow_hash, best_hash;
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int best, i;
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flow_hash = flow_hash_fields(flow, ntohs(nab->fields), ntohs(nab->basis));
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best = -1;
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2011-07-20 09:51:29 -07:00
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best_hash = 0;
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2011-06-10 17:45:45 -07:00
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for (i = 0; i < ntohs(nab->n_slaves); i++) {
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if (slave_enabled(bundle_get_slave(nab, i), aux)) {
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uint32_t hash = hash_2words(i, flow_hash);
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if (best < 0 || hash > best_hash) {
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best_hash = hash;
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best = i;
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}
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}
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}
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return best >= 0 ? bundle_get_slave(nab, best) : OFPP_NONE;
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}
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2011-07-18 13:50:26 -07:00
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/* Executes 'nab' on 'flow'. Uses 'slave_enabled' to determine if the slave
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* designated by 'ofp_port' is up. Returns the chosen slave, or OFPP_NONE if
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* none of the slaves are acceptable. */
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uint16_t
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bundle_execute(const struct nx_action_bundle *nab, const struct flow *flow,
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bool (*slave_enabled)(uint16_t ofp_port, void *aux), void *aux)
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{
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switch (ntohs(nab->algorithm)) {
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case NX_BD_ALG_HRW: return execute_hrw(nab, flow, slave_enabled, aux);
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case NX_BD_ALG_ACTIVE_BACKUP: return execute_ab(nab, slave_enabled, aux);
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default: NOT_REACHED();
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}
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}
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2011-07-20 15:07:46 -07:00
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void
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bundle_execute_load(const struct nx_action_bundle *nab, struct flow *flow,
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bool (*slave_enabled)(uint16_t ofp_port, void *aux),
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void *aux)
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{
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nxm_reg_load(nab->dst, nab->ofs_nbits,
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bundle_execute(nab, flow, slave_enabled, aux), flow);
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}
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2011-06-10 17:45:45 -07:00
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/* Checks that 'nab' specifies a bundle action which is supported by this
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* bundle module. Uses the 'max_ports' parameter to validate each port using
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* ofputil_check_output_port(). Returns 0 if 'nab' is supported, otherwise an
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2012-01-12 15:48:19 -08:00
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* OFPERR_* error code. */
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enum ofperr
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bundle_check(const struct nx_action_bundle *nab, int max_ports,
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const struct flow *flow)
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2011-06-10 17:45:45 -07:00
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{
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static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
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2011-07-20 09:50:37 -07:00
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uint16_t n_slaves, fields, algorithm, subtype;
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uint32_t slave_type;
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2011-06-10 17:45:45 -07:00
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size_t slaves_size, i;
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enum ofperr error;
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2011-06-10 17:45:45 -07:00
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subtype = ntohs(nab->subtype);
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n_slaves = ntohs(nab->n_slaves);
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fields = ntohs(nab->fields);
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algorithm = ntohs(nab->algorithm);
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2011-07-20 09:50:37 -07:00
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slave_type = ntohl(nab->slave_type);
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2011-06-10 17:45:45 -07:00
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slaves_size = ntohs(nab->len) - sizeof *nab;
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2012-01-12 15:48:19 -08:00
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error = OFPERR_OFPBAC_BAD_ARGUMENT;
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2011-06-10 17:45:45 -07:00
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if (!flow_hash_fields_valid(fields)) {
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VLOG_WARN_RL(&rl, "unsupported fields %"PRIu16, fields);
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} else if (n_slaves > BUNDLE_MAX_SLAVES) {
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VLOG_WARN_RL(&rl, "too may slaves");
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2011-07-18 13:50:26 -07:00
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} else if (algorithm != NX_BD_ALG_HRW
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&& algorithm != NX_BD_ALG_ACTIVE_BACKUP) {
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VLOG_WARN_RL(&rl, "unsupported algorithm %"PRIu16, algorithm);
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} else if (slave_type != NXM_OF_IN_PORT) {
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VLOG_WARN_RL(&rl, "unsupported slave type %"PRIu16, slave_type);
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} else {
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error = 0;
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}
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for (i = 0; i < sizeof(nab->zero); i++) {
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if (nab->zero[i]) {
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VLOG_WARN_RL(&rl, "reserved field is nonzero");
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error = OFPERR_OFPBAC_BAD_ARGUMENT;
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2011-06-10 17:45:45 -07:00
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}
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}
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2011-07-20 15:07:46 -07:00
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if (subtype == NXAST_BUNDLE && (nab->ofs_nbits || nab->dst)) {
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VLOG_WARN_RL(&rl, "bundle action has nonzero reserved fields");
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error = OFPERR_OFPBAC_BAD_ARGUMENT;
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2011-07-20 15:07:46 -07:00
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}
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if (subtype == NXAST_BUNDLE_LOAD) {
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2011-08-10 13:09:18 -07:00
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int ofs = nxm_decode_ofs(nab->ofs_nbits);
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int n_bits = nxm_decode_n_bits(nab->ofs_nbits);
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if (n_bits < 16) {
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VLOG_WARN_RL(&rl, "bundle_load action requires at least 16 bit "
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"destination.");
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2012-01-12 15:48:19 -08:00
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error = OFPERR_OFPBAC_BAD_ARGUMENT;
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2011-12-27 15:44:41 -08:00
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} else if (!error) {
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error = nxm_dst_check(nab->dst, ofs, n_bits, flow);
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2011-08-10 13:09:18 -07:00
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}
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2011-07-20 15:07:46 -07:00
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}
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2011-06-10 17:45:45 -07:00
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if (slaves_size < n_slaves * sizeof(ovs_be16)) {
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VLOG_WARN_RL(&rl, "Nicira action %"PRIu16" only has %zu bytes "
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"allocated for slaves. %zu bytes are required for "
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"%"PRIu16" slaves.", subtype, slaves_size,
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n_slaves * sizeof(ovs_be16), n_slaves);
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2012-01-12 15:48:19 -08:00
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error = OFPERR_OFPBAC_BAD_LEN;
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2011-06-10 17:45:45 -07:00
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}
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for (i = 0; i < n_slaves; i++) {
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uint16_t ofp_port = bundle_get_slave(nab, i);
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2012-01-12 15:48:19 -08:00
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enum ofperr ofputil_error;
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2011-06-10 17:45:45 -07:00
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2012-01-12 15:48:19 -08:00
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ofputil_error = ofputil_check_output_port(ofp_port, max_ports);
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2011-06-10 17:45:45 -07:00
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if (ofputil_error) {
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VLOG_WARN_RL(&rl, "invalid slave %"PRIu16, ofp_port);
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error = ofputil_error;
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}
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/* Controller slaves are unsupported due to the lack of a max_len
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* argument. This may or may not change in the future. There doesn't
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* seem to be a real-world use-case for supporting it. */
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if (ofp_port == OFPP_CONTROLLER) {
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VLOG_WARN_RL(&rl, "unsupported controller slave");
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error = OFPERR_OFPBAC_BAD_OUT_PORT;
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2011-06-10 17:45:45 -07:00
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}
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}
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return error;
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}
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2011-07-20 15:07:46 -07:00
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/* Helper for bundle_parse and bundle_parse_load. */
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static void
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bundle_parse__(struct ofpbuf *b, const char *s, char **save_ptr,
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const char *fields, const char *basis, const char *algorithm,
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const char *slave_type, const char *dst,
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const char *slave_delim)
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2011-06-10 17:45:45 -07:00
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{
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2011-08-16 16:30:57 -07:00
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enum ofputil_action_code code;
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2011-06-10 17:45:45 -07:00
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struct nx_action_bundle *nab;
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uint16_t n_slaves;
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if (!slave_delim) {
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ovs_fatal(0, "%s: not enough arguments to bundle action", s);
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}
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if (strcasecmp(slave_delim, "slaves")) {
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ovs_fatal(0, "%s: missing slave delimiter, expected `slaves' got `%s'",
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s, slave_delim);
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}
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2011-08-16 16:30:57 -07:00
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code = dst ? OFPUTIL_NXAST_BUNDLE_LOAD : OFPUTIL_NXAST_BUNDLE;
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b->l2 = ofputil_put_action(code, b);
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2011-06-10 17:45:45 -07:00
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n_slaves = 0;
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for (;;) {
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ovs_be16 slave_be;
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char *slave;
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2011-10-27 16:58:20 -07:00
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slave = strtok_r(NULL, ", [", save_ptr);
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2011-06-10 17:45:45 -07:00
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if (!slave || n_slaves >= BUNDLE_MAX_SLAVES) {
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break;
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}
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slave_be = htons(atoi(slave));
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ofpbuf_put(b, &slave_be, sizeof slave_be);
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n_slaves++;
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}
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/* Slaves array must be multiple of 8 bytes long. */
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if (b->size % 8) {
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ofpbuf_put_zeros(b, 8 - (b->size % 8));
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}
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nab = b->l2;
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nab->len = htons(b->size - ((char *) b->l2 - (char *) b->data));
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nab->n_slaves = htons(n_slaves);
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nab->basis = htons(atoi(basis));
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if (!strcasecmp(fields, "eth_src")) {
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nab->fields = htons(NX_HASH_FIELDS_ETH_SRC);
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} else if (!strcasecmp(fields, "symmetric_l4")) {
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nab->fields = htons(NX_HASH_FIELDS_SYMMETRIC_L4);
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} else {
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ovs_fatal(0, "%s: unknown fields `%s'", s, fields);
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}
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if (!strcasecmp(algorithm, "active_backup")) {
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nab->algorithm = htons(NX_BD_ALG_ACTIVE_BACKUP);
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} else if (!strcasecmp(algorithm, "hrw")) {
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nab->algorithm = htons(NX_BD_ALG_HRW);
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} else {
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ovs_fatal(0, "%s: unknown algorithm `%s'", s, algorithm);
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}
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if (!strcasecmp(slave_type, "ofport")) {
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2011-07-20 09:50:37 -07:00
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nab->slave_type = htonl(NXM_OF_IN_PORT);
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2011-06-10 17:45:45 -07:00
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} else {
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ovs_fatal(0, "%s: unknown slave_type `%s'", s, slave_type);
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}
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2011-07-20 15:07:46 -07:00
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if (dst) {
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uint32_t reg;
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int ofs, n_bits;
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nxm_parse_field_bits(dst, ®, &ofs, &n_bits);
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nab->dst = htonl(reg);
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nab->ofs_nbits = nxm_encode_ofs_nbits(ofs, n_bits);
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}
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2011-06-10 17:45:45 -07:00
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b->l2 = NULL;
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2011-07-20 15:07:46 -07:00
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}
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/* Converts a bundle action string contained in 's' to an nx_action_bundle and
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* stores it in 'b'. Sets 'b''s l2 pointer to NULL. */
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void
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bundle_parse(struct ofpbuf *b, const char *s)
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{
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char *fields, *basis, *algorithm, *slave_type, *slave_delim;
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char *tokstr, *save_ptr;
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save_ptr = NULL;
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tokstr = xstrdup(s);
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fields = strtok_r(tokstr, ", ", &save_ptr);
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basis = strtok_r(NULL, ", ", &save_ptr);
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algorithm = strtok_r(NULL, ", ", &save_ptr);
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slave_type = strtok_r(NULL, ", ", &save_ptr);
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slave_delim = strtok_r(NULL, ": ", &save_ptr);
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bundle_parse__(b, s, &save_ptr, fields, basis, algorithm, slave_type, NULL,
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slave_delim);
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free(tokstr);
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}
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/* Converts a bundle_load action string contained in 's' to an nx_action_bundle
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* and stores it in 'b'. Sets 'b''s l2 pointer to NULL. */
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void
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bundle_parse_load(struct ofpbuf *b, const char *s)
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{
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char *fields, *basis, *algorithm, *slave_type, *dst, *slave_delim;
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char *tokstr, *save_ptr;
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save_ptr = NULL;
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tokstr = xstrdup(s);
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fields = strtok_r(tokstr, ", ", &save_ptr);
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basis = strtok_r(NULL, ", ", &save_ptr);
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algorithm = strtok_r(NULL, ", ", &save_ptr);
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slave_type = strtok_r(NULL, ", ", &save_ptr);
|
|
|
|
dst = strtok_r(NULL, ", ", &save_ptr);
|
|
|
|
slave_delim = strtok_r(NULL, ": ", &save_ptr);
|
|
|
|
|
|
|
|
bundle_parse__(b, s, &save_ptr, fields, basis, algorithm, slave_type, dst,
|
|
|
|
slave_delim);
|
|
|
|
|
2011-06-10 17:45:45 -07:00
|
|
|
free(tokstr);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Appends a human-readable representation of 'nab' to 's'. */
|
|
|
|
void
|
|
|
|
bundle_format(const struct nx_action_bundle *nab, struct ds *s)
|
|
|
|
{
|
2011-07-20 15:07:46 -07:00
|
|
|
const char *action, *fields, *algorithm, *slave_type;
|
2011-06-10 17:45:45 -07:00
|
|
|
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>";
|
|
|
|
}
|
|
|
|
|
2011-07-20 09:50:37 -07:00
|
|
|
switch (ntohl(nab->slave_type)) {
|
2011-06-10 17:45:45 -07:00
|
|
|
case NXM_OF_IN_PORT:
|
|
|
|
slave_type = "ofport";
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
slave_type = "<unknown>";
|
|
|
|
}
|
|
|
|
|
2011-07-20 15:07:46 -07:00
|
|
|
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,
|
2011-06-10 17:45:45 -07:00
|
|
|
ntohs(nab->basis), algorithm, slave_type);
|
|
|
|
|
2011-07-20 15:07:46 -07:00
|
|
|
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:");
|
2011-06-10 17:45:45 -07:00
|
|
|
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, ")");
|
|
|
|
}
|