/usr/src/openvswitch-1.4.0/lib/bundle.c is in openvswitch-datapath-dkms 1.4.0-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 | /* 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 "bundle.h"
#include <arpa/inet.h>
#include <inttypes.h>
#include "dynamic-string.h"
#include "multipath.h"
#include "nx-match.h"
#include "ofpbuf.h"
#include "ofp-util.h"
#include "openflow/nicira-ext.h"
#include "vlog.h"
#define BUNDLE_MAX_SLAVES 2048
VLOG_DEFINE_THIS_MODULE(bundle);
static uint16_t
execute_ab(const struct nx_action_bundle *nab,
bool (*slave_enabled)(uint16_t ofp_port, void *aux), void *aux)
{
size_t i;
for (i = 0; i < ntohs(nab->n_slaves); i++) {
uint16_t slave = bundle_get_slave(nab, i);
if (slave_enabled(slave, aux)) {
return slave;
}
}
return OFPP_NONE;
}
static uint16_t
execute_hrw(const struct nx_action_bundle *nab, const struct flow *flow,
bool (*slave_enabled)(uint16_t ofp_port, void *aux), void *aux)
{
uint32_t flow_hash, best_hash;
int best, i;
flow_hash = flow_hash_fields(flow, ntohs(nab->fields), ntohs(nab->basis));
best = -1;
best_hash = 0;
for (i = 0; i < ntohs(nab->n_slaves); i++) {
if (slave_enabled(bundle_get_slave(nab, i), aux)) {
uint32_t hash = hash_2words(i, flow_hash);
if (best < 0 || hash > best_hash) {
best_hash = hash;
best = i;
}
}
}
return best >= 0 ? bundle_get_slave(nab, best) : OFPP_NONE;
}
/* Executes 'nab' on 'flow'. Uses 'slave_enabled' to determine if the slave
* designated by 'ofp_port' is up. Returns the chosen slave, or OFPP_NONE if
* none of the slaves are acceptable. */
uint16_t
bundle_execute(const struct nx_action_bundle *nab, const struct flow *flow,
bool (*slave_enabled)(uint16_t ofp_port, void *aux), void *aux)
{
switch (ntohs(nab->algorithm)) {
case NX_BD_ALG_HRW: return execute_hrw(nab, flow, slave_enabled, aux);
case NX_BD_ALG_ACTIVE_BACKUP: return execute_ab(nab, slave_enabled, aux);
default: NOT_REACHED();
}
}
void
bundle_execute_load(const struct nx_action_bundle *nab, struct flow *flow,
bool (*slave_enabled)(uint16_t ofp_port, void *aux),
void *aux)
{
nxm_reg_load(nab->dst, nab->ofs_nbits,
bundle_execute(nab, flow, slave_enabled, aux), flow);
}
/* 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 if (!error) {
error = nxm_dst_check(nab->dst, ofs, n_bits, flow);
}
}
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;
}
/* Helper for bundle_parse and bundle_parse_load. */
static void
bundle_parse__(struct ofpbuf *b, const char *s, char **save_ptr,
const char *fields, const char *basis, const char *algorithm,
const char *slave_type, const char *dst,
const char *slave_delim)
{
enum ofputil_action_code code;
struct nx_action_bundle *nab;
uint16_t n_slaves;
if (!slave_delim) {
ovs_fatal(0, "%s: not enough arguments to bundle action", s);
}
if (strcasecmp(slave_delim, "slaves")) {
ovs_fatal(0, "%s: missing slave delimiter, expected `slaves' got `%s'",
s, slave_delim);
}
code = dst ? OFPUTIL_NXAST_BUNDLE_LOAD : OFPUTIL_NXAST_BUNDLE;
b->l2 = ofputil_put_action(code, b);
n_slaves = 0;
for (;;) {
ovs_be16 slave_be;
char *slave;
slave = strtok_r(NULL, ", [", save_ptr);
if (!slave || n_slaves >= BUNDLE_MAX_SLAVES) {
break;
}
slave_be = htons(atoi(slave));
ofpbuf_put(b, &slave_be, sizeof slave_be);
n_slaves++;
}
/* Slaves array must be multiple of 8 bytes long. */
if (b->size % 8) {
ofpbuf_put_zeros(b, 8 - (b->size % 8));
}
nab = b->l2;
nab->len = htons(b->size - ((char *) b->l2 - (char *) b->data));
nab->n_slaves = htons(n_slaves);
nab->basis = htons(atoi(basis));
if (!strcasecmp(fields, "eth_src")) {
nab->fields = htons(NX_HASH_FIELDS_ETH_SRC);
} else if (!strcasecmp(fields, "symmetric_l4")) {
nab->fields = htons(NX_HASH_FIELDS_SYMMETRIC_L4);
} else {
ovs_fatal(0, "%s: unknown fields `%s'", s, fields);
}
if (!strcasecmp(algorithm, "active_backup")) {
nab->algorithm = htons(NX_BD_ALG_ACTIVE_BACKUP);
} else if (!strcasecmp(algorithm, "hrw")) {
nab->algorithm = htons(NX_BD_ALG_HRW);
} else {
ovs_fatal(0, "%s: unknown algorithm `%s'", s, algorithm);
}
if (!strcasecmp(slave_type, "ofport")) {
nab->slave_type = htonl(NXM_OF_IN_PORT);
} else {
ovs_fatal(0, "%s: unknown slave_type `%s'", s, slave_type);
}
if (dst) {
uint32_t reg;
int ofs, n_bits;
nxm_parse_field_bits(dst, ®, &ofs, &n_bits);
nab->dst = htonl(reg);
nab->ofs_nbits = nxm_encode_ofs_nbits(ofs, n_bits);
}
b->l2 = NULL;
}
/* Converts a bundle action string contained in 's' to an nx_action_bundle and
* stores it in 'b'. Sets 'b''s l2 pointer to NULL. */
void
bundle_parse(struct ofpbuf *b, const char *s)
{
char *fields, *basis, *algorithm, *slave_type, *slave_delim;
char *tokstr, *save_ptr;
save_ptr = NULL;
tokstr = xstrdup(s);
fields = strtok_r(tokstr, ", ", &save_ptr);
basis = strtok_r(NULL, ", ", &save_ptr);
algorithm = strtok_r(NULL, ", ", &save_ptr);
slave_type = strtok_r(NULL, ", ", &save_ptr);
slave_delim = strtok_r(NULL, ": ", &save_ptr);
bundle_parse__(b, s, &save_ptr, fields, basis, algorithm, slave_type, NULL,
slave_delim);
free(tokstr);
}
/* Converts a bundle_load action string contained in 's' to an nx_action_bundle
* and stores it in 'b'. Sets 'b''s l2 pointer to NULL. */
void
bundle_parse_load(struct ofpbuf *b, const char *s)
{
char *fields, *basis, *algorithm, *slave_type, *dst, *slave_delim;
char *tokstr, *save_ptr;
save_ptr = NULL;
tokstr = xstrdup(s);
fields = strtok_r(tokstr, ", ", &save_ptr);
basis = strtok_r(NULL, ", ", &save_ptr);
algorithm = strtok_r(NULL, ", ", &save_ptr);
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);
free(tokstr);
}
/* 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, ")");
}
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