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/*
* Copyright (c) 2011 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include "autopath.h"
#include <inttypes.h>
#include <stdlib.h>
#include "flow.h"
#include "nx-match.h"
#include "ofp-util.h"
#include "openflow/nicira-ext.h"
#include "vlog.h"
VLOG_DEFINE_THIS_MODULE(autopath);
/* Loads 'ofp_port' into the appropriate register in accordance with the
* autopath action. */
void
autopath_execute(const struct nx_action_autopath *ap, struct flow *flow,
uint16_t ofp_port)
{
nxm_reg_load(ap->dst, ap->ofs_nbits, ofp_port, flow);
}
void
autopath_parse(struct nx_action_autopath *ap, const char *s_)
{
char *s;
uint32_t reg;
int id_int, ofs, n_bits;
char *id_str, *dst, *save_ptr;
s = xstrdup(s_);
save_ptr = NULL;
id_str = strtok_r(s, ", ", &save_ptr);
dst = strtok_r(NULL, ", ", &save_ptr);
if (!dst) {
ovs_fatal(0, "%s: not enough arguments to autopath action", s_);
}
id_int = atoi(id_str);
if (id_int < 1 || id_int > UINT32_MAX) {
ovs_fatal(0, "%s: autopath id %d is not in valid range "
"1 to %"PRIu32, s_, id_int, UINT32_MAX);
}
nxm_parse_field_bits(dst, ®, &ofs, &n_bits);
if (n_bits < 16) {
ovs_fatal(0, "%s: %d-bit destination field has %u possible values, "
"less than required 65536", s_, n_bits, 1u << n_bits);
}
ofputil_init_NXAST_AUTOPATH(ap);
ap->id = htonl(id_int);
ap->ofs_nbits = nxm_encode_ofs_nbits(ofs, n_bits);
ap->dst = htonl(reg);
free(s);
}
int
autopath_check(const struct nx_action_autopath *ap, const struct flow *flow)
{
int n_bits = nxm_decode_n_bits(ap->ofs_nbits);
int ofs = nxm_decode_ofs(ap->ofs_nbits);
if (n_bits < 16) {
VLOG_WARN("at least 16 bit destination is required for autopath "
"action.");
return ofp_mkerr(OFPET_BAD_ACTION, OFPBAC_BAD_ARGUMENT);
}
return nxm_dst_check(ap->dst, ofs, n_bits, flow);
}
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