2 * Copyright (c) 2010, 2011, 2012 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
19 #include "ofp-parse.h"
27 #include "byte-order.h"
28 #include "dynamic-string.h"
30 #include "meta-flow.h"
31 #include "multipath.h"
34 #include "ofp-actions.h"
37 #include "openflow/openflow.h"
39 #include "socket-util.h"
43 VLOG_DEFINE_THIS_MODULE(ofp_parse);
45 static void ofp_fatal(const char *flow, bool verbose, const char *format, ...)
49 str_to_table_id(const char *str)
53 if (!str_to_int(str, 10, &table_id) || table_id < 0 || table_id > 255) {
54 ovs_fatal(0, "invalid table \"%s\"", str);
60 str_to_u16(const char *str, const char *name)
64 if (!str_to_int(str, 0, &value) || value < 0 || value > 65535) {
65 ovs_fatal(0, "invalid %s \"%s\"", name, str);
71 str_to_u32(const char *str)
77 ovs_fatal(0, "missing required numeric argument");
81 value = strtoul(str, &tail, 0);
82 if (errno == EINVAL || errno == ERANGE || *tail) {
83 ovs_fatal(0, "invalid numeric format %s", str);
89 str_to_u64(const char *str)
95 ovs_fatal(0, "missing required numeric argument");
99 value = strtoull(str, &tail, 0);
100 if (errno == EINVAL || errno == ERANGE || *tail) {
101 ovs_fatal(0, "invalid numeric format %s", str);
107 str_to_mac(const char *str, uint8_t mac[6])
109 if (sscanf(str, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(mac))
110 != ETH_ADDR_SCAN_COUNT) {
111 ovs_fatal(0, "invalid mac address %s", str);
116 str_to_ip(const char *str, ovs_be32 *ip)
118 struct in_addr in_addr;
120 if (lookup_ip(str, &in_addr)) {
121 ovs_fatal(0, "%s: could not convert to IP address", str);
123 *ip = in_addr.s_addr;
127 parse_enqueue(char *arg, struct ofpbuf *ofpacts)
130 char *port = strtok_r(arg, ":q", &sp);
131 char *queue = strtok_r(NULL, "", &sp);
132 struct ofpact_enqueue *enqueue;
134 if (port == NULL || queue == NULL) {
135 ovs_fatal(0, "\"enqueue\" syntax is \"enqueue:PORT:QUEUE\"");
138 enqueue = ofpact_put_ENQUEUE(ofpacts);
139 enqueue->port = str_to_u32(port);
140 enqueue->queue = str_to_u32(queue);
144 parse_output(char *arg, struct ofpbuf *ofpacts)
146 if (strchr(arg, '[')) {
147 struct ofpact_output_reg *output_reg;
149 output_reg = ofpact_put_OUTPUT_REG(ofpacts);
150 mf_parse_subfield(&output_reg->src, arg);
151 output_reg->max_len = UINT16_MAX;
153 struct ofpact_output *output;
155 output = ofpact_put_OUTPUT(ofpacts);
156 output->port = str_to_u32(arg);
157 output->max_len = output->port == OFPP_CONTROLLER ? UINT16_MAX : 0;
162 parse_resubmit(char *arg, struct ofpbuf *ofpacts)
164 struct ofpact_resubmit *resubmit;
165 char *in_port_s, *table_s;
167 resubmit = ofpact_put_RESUBMIT(ofpacts);
169 in_port_s = strsep(&arg, ",");
170 if (in_port_s && in_port_s[0]) {
171 if (!ofputil_port_from_string(in_port_s, &resubmit->in_port)) {
172 resubmit->in_port = str_to_u32(in_port_s);
175 resubmit->in_port = OFPP_IN_PORT;
178 table_s = strsep(&arg, ",");
179 resubmit->table_id = table_s && table_s[0] ? str_to_u32(table_s) : 255;
181 if (resubmit->in_port == OFPP_IN_PORT && resubmit->table_id == 255) {
182 ovs_fatal(0, "at least one \"in_port\" or \"table\" must be specified "
188 parse_note(const char *arg, struct ofpbuf *ofpacts)
190 struct ofpact_note *note;
192 note = ofpact_put_NOTE(ofpacts);
193 while (*arg != '\0') {
204 byte = hexits_value(arg, 2, &ok);
206 ovs_fatal(0, "bad hex digit in `note' argument");
208 ofpbuf_put(ofpacts, &byte, 1);
215 ofpact_update_len(ofpacts, ¬e->ofpact);
219 parse_fin_timeout(struct ofpbuf *b, char *arg)
221 struct ofpact_fin_timeout *oft = ofpact_put_FIN_TIMEOUT(b);
224 while (ofputil_parse_key_value(&arg, &key, &value)) {
225 if (!strcmp(key, "idle_timeout")) {
226 oft->fin_idle_timeout = str_to_u16(value, key);
227 } else if (!strcmp(key, "hard_timeout")) {
228 oft->fin_hard_timeout = str_to_u16(value, key);
230 ovs_fatal(0, "invalid key '%s' in 'fin_timeout' argument", key);
236 parse_controller(struct ofpbuf *b, char *arg)
238 enum ofp_packet_in_reason reason = OFPR_ACTION;
239 uint16_t controller_id = 0;
240 uint16_t max_len = UINT16_MAX;
244 } else if (strspn(arg, "0123456789") == strlen(arg)) {
245 max_len = str_to_u16(arg, "max_len");
249 while (ofputil_parse_key_value(&arg, &name, &value)) {
250 if (!strcmp(name, "reason")) {
251 if (!ofputil_packet_in_reason_from_string(value, &reason)) {
252 ovs_fatal(0, "unknown reason \"%s\"", value);
254 } else if (!strcmp(name, "max_len")) {
255 max_len = str_to_u16(value, "max_len");
256 } else if (!strcmp(name, "id")) {
257 controller_id = str_to_u16(value, "id");
259 ovs_fatal(0, "unknown key \"%s\" parsing controller action",
265 if (reason == OFPR_ACTION && controller_id == 0) {
266 struct ofpact_output *output;
268 output = ofpact_put_OUTPUT(b);
269 output->port = OFPP_CONTROLLER;
270 output->max_len = max_len;
272 struct ofpact_controller *controller;
274 controller = ofpact_put_CONTROLLER(b);
275 controller->max_len = max_len;
276 controller->reason = reason;
277 controller->controller_id = controller_id;
282 parse_dec_ttl(struct ofpbuf *b, char *arg)
284 struct ofpact_cnt_ids *ids;
286 ids = ofpact_put_DEC_TTL(b);
291 ids->ofpact.compat = OFPUTIL_NXAST_DEC_TTL;
292 ofpbuf_put(b, &id, sizeof id);
294 ids->n_controllers++;
298 ids->ofpact.compat = OFPUTIL_NXAST_DEC_TTL_CNT_IDS;
299 for (cntr = strtok_r(arg, ", ", &arg); cntr != NULL;
300 cntr = strtok_r(NULL, ", ", &arg)) {
301 uint16_t id = atoi(cntr);
303 ofpbuf_put(b, &id, sizeof id);
305 ids->n_controllers++;
307 if (!ids->n_controllers) {
308 ovs_fatal(0, "dec_ttl_cnt_ids: expected at least one controller "
313 ofpact_update_len(b, &ids->ofpact);
317 parse_named_action(enum ofputil_action_code code, const struct flow *flow,
318 char *arg, struct ofpbuf *ofpacts)
320 struct ofpact_tunnel *tunnel;
327 case OFPUTIL_ACTION_INVALID:
330 case OFPUTIL_OFPAT10_OUTPUT:
331 case OFPUTIL_OFPAT11_OUTPUT:
332 parse_output(arg, ofpacts);
335 case OFPUTIL_OFPAT10_SET_VLAN_VID:
336 case OFPUTIL_OFPAT11_SET_VLAN_VID:
337 vid = str_to_u32(arg);
338 if (vid & ~VLAN_VID_MASK) {
339 ovs_fatal(0, "%s: not a valid VLAN VID", arg);
341 ofpact_put_SET_VLAN_VID(ofpacts)->vlan_vid = vid;
344 case OFPUTIL_OFPAT10_SET_VLAN_PCP:
345 case OFPUTIL_OFPAT11_SET_VLAN_PCP:
346 pcp = str_to_u32(arg);
348 ovs_fatal(0, "%s: not a valid VLAN PCP", arg);
350 ofpact_put_SET_VLAN_PCP(ofpacts)->vlan_pcp = pcp;
353 case OFPUTIL_OFPAT10_STRIP_VLAN:
354 ofpact_put_STRIP_VLAN(ofpacts);
357 case OFPUTIL_OFPAT10_SET_DL_SRC:
358 case OFPUTIL_OFPAT11_SET_DL_SRC:
359 str_to_mac(arg, ofpact_put_SET_ETH_SRC(ofpacts)->mac);
362 case OFPUTIL_OFPAT10_SET_DL_DST:
363 case OFPUTIL_OFPAT11_SET_DL_DST:
364 str_to_mac(arg, ofpact_put_SET_ETH_DST(ofpacts)->mac);
367 case OFPUTIL_OFPAT10_SET_NW_SRC:
368 case OFPUTIL_OFPAT11_SET_NW_SRC:
370 ofpact_put_SET_IPV4_SRC(ofpacts)->ipv4 = ip;
373 case OFPUTIL_OFPAT10_SET_NW_DST:
374 case OFPUTIL_OFPAT11_SET_NW_DST:
376 ofpact_put_SET_IPV4_DST(ofpacts)->ipv4 = ip;
379 case OFPUTIL_OFPAT10_SET_NW_TOS:
380 case OFPUTIL_OFPAT11_SET_NW_TOS:
381 tos = str_to_u32(arg);
382 if (tos & ~IP_DSCP_MASK) {
383 ovs_fatal(0, "%s: not a valid TOS", arg);
385 ofpact_put_SET_IPV4_DSCP(ofpacts)->dscp = tos;
388 case OFPUTIL_OFPAT10_SET_TP_SRC:
389 case OFPUTIL_OFPAT11_SET_TP_SRC:
390 ofpact_put_SET_L4_SRC_PORT(ofpacts)->port = str_to_u32(arg);
393 case OFPUTIL_OFPAT10_SET_TP_DST:
394 case OFPUTIL_OFPAT11_SET_TP_DST:
395 ofpact_put_SET_L4_DST_PORT(ofpacts)->port = str_to_u32(arg);
398 case OFPUTIL_OFPAT10_ENQUEUE:
399 parse_enqueue(arg, ofpacts);
402 case OFPUTIL_NXAST_RESUBMIT:
403 parse_resubmit(arg, ofpacts);
406 case OFPUTIL_NXAST_SET_TUNNEL:
407 case OFPUTIL_NXAST_SET_TUNNEL64:
408 tunnel = ofpact_put_SET_TUNNEL(ofpacts);
409 tunnel->ofpact.compat = code;
410 tunnel->tun_id = str_to_u64(arg);
413 case OFPUTIL_NXAST_SET_QUEUE:
414 ofpact_put_SET_QUEUE(ofpacts)->queue_id = str_to_u32(arg);
417 case OFPUTIL_NXAST_POP_QUEUE:
418 ofpact_put_POP_QUEUE(ofpacts);
421 case OFPUTIL_NXAST_REG_MOVE:
422 nxm_parse_reg_move(ofpact_put_REG_MOVE(ofpacts), arg);
425 case OFPUTIL_NXAST_REG_LOAD:
426 nxm_parse_reg_load(ofpact_put_REG_LOAD(ofpacts), arg);
429 case OFPUTIL_NXAST_NOTE:
430 parse_note(arg, ofpacts);
433 case OFPUTIL_NXAST_MULTIPATH:
434 multipath_parse(ofpact_put_MULTIPATH(ofpacts), arg);
437 case OFPUTIL_NXAST_AUTOPATH__DEPRECATED:
438 autopath_parse(ofpact_put_AUTOPATH(ofpacts), arg);
441 case OFPUTIL_NXAST_BUNDLE:
442 bundle_parse(arg, ofpacts);
445 case OFPUTIL_NXAST_BUNDLE_LOAD:
446 bundle_parse_load(arg, ofpacts);
449 case OFPUTIL_NXAST_RESUBMIT_TABLE:
450 case OFPUTIL_NXAST_OUTPUT_REG:
451 case OFPUTIL_NXAST_DEC_TTL_CNT_IDS:
454 case OFPUTIL_NXAST_LEARN:
455 learn_parse(arg, flow, ofpacts);
458 case OFPUTIL_NXAST_EXIT:
459 ofpact_put_EXIT(ofpacts);
462 case OFPUTIL_NXAST_DEC_TTL:
463 parse_dec_ttl(ofpacts, arg);
466 case OFPUTIL_NXAST_FIN_TIMEOUT:
467 parse_fin_timeout(ofpacts, arg);
470 case OFPUTIL_NXAST_CONTROLLER:
471 parse_controller(ofpacts, arg);
477 str_to_ofpacts(const struct flow *flow, char *str, struct ofpbuf *ofpacts)
479 char *pos, *act, *arg;
484 while (ofputil_parse_key_value(&pos, &act, &arg)) {
488 code = ofputil_action_code_from_name(act);
490 parse_named_action(code, flow, arg, ofpacts);
491 } else if (!strcasecmp(act, "drop")) {
493 ovs_fatal(0, "Drop actions must not be preceded by other "
495 } else if (ofputil_parse_key_value(&pos, &act, &arg)) {
496 ovs_fatal(0, "Drop actions must not be followed by other "
500 } else if (ofputil_port_from_string(act, &port)) {
501 ofpact_put_OUTPUT(ofpacts)->port = port;
503 ovs_fatal(0, "Unknown action: %s", act);
517 parse_protocol(const char *name, const struct protocol **p_out)
519 static const struct protocol protocols[] = {
520 { "ip", ETH_TYPE_IP, 0 },
521 { "arp", ETH_TYPE_ARP, 0 },
522 { "icmp", ETH_TYPE_IP, IPPROTO_ICMP },
523 { "tcp", ETH_TYPE_IP, IPPROTO_TCP },
524 { "udp", ETH_TYPE_IP, IPPROTO_UDP },
525 { "ipv6", ETH_TYPE_IPV6, 0 },
526 { "ip6", ETH_TYPE_IPV6, 0 },
527 { "icmp6", ETH_TYPE_IPV6, IPPROTO_ICMPV6 },
528 { "tcp6", ETH_TYPE_IPV6, IPPROTO_TCP },
529 { "udp6", ETH_TYPE_IPV6, IPPROTO_UDP },
531 const struct protocol *p;
533 for (p = protocols; p < &protocols[ARRAY_SIZE(protocols)]; p++) {
534 if (!strcmp(p->name, name)) {
544 ofp_fatal(const char *flow, bool verbose, const char *format, ...)
549 fprintf(stderr, "%s:\n", flow);
552 va_start(args, format);
553 ovs_fatal_valist(0, format, args);
557 parse_field(const struct mf_field *mf, const char *s, struct cls_rule *rule)
559 union mf_value value, mask;
562 error = mf_parse(mf, s, &value, &mask);
564 ovs_fatal(0, "%s", error);
567 mf_set(mf, &value, &mask, rule);
570 /* Convert 'str_' (as described in the Flow Syntax section of the ovs-ofctl man
571 * page) into 'fm' for sending the specified flow_mod 'command' to a switch.
572 * If 'actions' is specified, an action must be in 'string' and may be expanded
575 * To parse syntax for an OFPT_FLOW_MOD (or NXT_FLOW_MOD), use an OFPFC_*
576 * constant for 'command'. To parse syntax for an OFPST_FLOW or
577 * OFPST_AGGREGATE (or NXST_FLOW or NXST_AGGREGATE), use -1 for 'command'. */
579 parse_ofp_str(struct ofputil_flow_mod *fm, int command, const char *str_,
589 char *string = xstrdup(str_);
590 char *save_ptr = NULL;
591 char *act_str = NULL;
600 fields = F_ACTIONS | F_TIMEOUT | F_PRIORITY | F_FLAGS;
607 case OFPFC_DELETE_STRICT:
608 fields = F_OUT_PORT | F_PRIORITY;
612 fields = F_ACTIONS | F_TIMEOUT | F_PRIORITY | F_FLAGS;
615 case OFPFC_MODIFY_STRICT:
616 fields = F_ACTIONS | F_TIMEOUT | F_PRIORITY | F_FLAGS;
623 cls_rule_init_catchall(&fm->cr, OFP_DEFAULT_PRIORITY);
624 fm->cookie = htonll(0);
625 fm->cookie_mask = htonll(0);
626 if (command == OFPFC_MODIFY || command == OFPFC_MODIFY_STRICT) {
627 /* For modify, by default, don't update the cookie. */
628 fm->new_cookie = htonll(UINT64_MAX);
630 fm->new_cookie = htonll(0);
633 fm->command = command;
634 fm->idle_timeout = OFP_FLOW_PERMANENT;
635 fm->hard_timeout = OFP_FLOW_PERMANENT;
636 fm->buffer_id = UINT32_MAX;
637 fm->out_port = OFPP_NONE;
639 if (fields & F_ACTIONS) {
640 act_str = strstr(string, "action");
642 ofp_fatal(str_, verbose, "must specify an action");
646 act_str = strchr(act_str + 1, '=');
648 ofp_fatal(str_, verbose, "must specify an action");
653 for (name = strtok_r(string, "=, \t\r\n", &save_ptr); name;
654 name = strtok_r(NULL, "=, \t\r\n", &save_ptr)) {
655 const struct protocol *p;
657 if (parse_protocol(name, &p)) {
658 cls_rule_set_dl_type(&fm->cr, htons(p->dl_type));
660 cls_rule_set_nw_proto(&fm->cr, p->nw_proto);
662 } else if (fields & F_FLAGS && !strcmp(name, "send_flow_rem")) {
663 fm->flags |= OFPFF_SEND_FLOW_REM;
664 } else if (fields & F_FLAGS && !strcmp(name, "check_overlap")) {
665 fm->flags |= OFPFF_CHECK_OVERLAP;
669 value = strtok_r(NULL, ", \t\r\n", &save_ptr);
671 ofp_fatal(str_, verbose, "field %s missing value", name);
674 if (!strcmp(name, "table")) {
675 fm->table_id = str_to_table_id(value);
676 } else if (!strcmp(name, "out_port")) {
677 fm->out_port = atoi(value);
678 } else if (fields & F_PRIORITY && !strcmp(name, "priority")) {
679 fm->cr.priority = str_to_u16(value, name);
680 } else if (fields & F_TIMEOUT && !strcmp(name, "idle_timeout")) {
681 fm->idle_timeout = str_to_u16(value, name);
682 } else if (fields & F_TIMEOUT && !strcmp(name, "hard_timeout")) {
683 fm->hard_timeout = str_to_u16(value, name);
684 } else if (!strcmp(name, "cookie")) {
685 char *mask = strchr(value, '/');
688 /* A mask means we're searching for a cookie. */
689 if (command == OFPFC_ADD) {
690 ofp_fatal(str_, verbose, "flow additions cannot use "
694 fm->cookie = htonll(str_to_u64(value));
695 fm->cookie_mask = htonll(str_to_u64(mask+1));
697 /* No mask means that the cookie is being set. */
698 if (command != OFPFC_ADD && command != OFPFC_MODIFY
699 && command != OFPFC_MODIFY_STRICT) {
700 ofp_fatal(str_, verbose, "cannot set cookie");
702 fm->new_cookie = htonll(str_to_u64(value));
704 } else if (mf_from_name(name)) {
705 parse_field(mf_from_name(name), value, &fm->cr);
706 } else if (!strcmp(name, "duration")
707 || !strcmp(name, "n_packets")
708 || !strcmp(name, "n_bytes")) {
709 /* Ignore these, so that users can feed the output of
710 * "ovs-ofctl dump-flows" back into commands that parse
713 ofp_fatal(str_, verbose, "unknown keyword %s", name);
717 if (!fm->cookie_mask && fm->new_cookie == htonll(UINT64_MAX)
718 && (command == OFPFC_MODIFY || command == OFPFC_MODIFY_STRICT)) {
719 /* On modifies without a mask, we are supposed to add a flow if
720 * one does not exist. If a cookie wasn't been specified, use a
721 * default of zero. */
722 fm->new_cookie = htonll(0);
724 if (fields & F_ACTIONS) {
725 struct ofpbuf ofpacts;
727 ofpbuf_init(&ofpacts, 32);
728 str_to_ofpacts(&fm->cr.flow, act_str, &ofpacts);
729 fm->ofpacts_len = ofpacts.size;
730 fm->ofpacts = ofpbuf_steal_data(&ofpacts);
739 /* Convert 'str_' (as described in the documentation for the "monitor" command
740 * in the ovs-ofctl man page) into 'fmr'. */
742 parse_flow_monitor_request(struct ofputil_flow_monitor_request *fmr,
747 char *string = xstrdup(str_);
748 char *save_ptr = NULL;
752 fmr->flags = (NXFMF_INITIAL | NXFMF_ADD | NXFMF_DELETE | NXFMF_MODIFY
753 | NXFMF_OWN | NXFMF_ACTIONS);
754 fmr->out_port = OFPP_NONE;
755 fmr->table_id = 0xff;
756 cls_rule_init_catchall(&fmr->match, 0);
758 for (name = strtok_r(string, "=, \t\r\n", &save_ptr); name;
759 name = strtok_r(NULL, "=, \t\r\n", &save_ptr)) {
760 const struct protocol *p;
762 if (!strcmp(name, "!initial")) {
763 fmr->flags &= ~NXFMF_INITIAL;
764 } else if (!strcmp(name, "!add")) {
765 fmr->flags &= ~NXFMF_ADD;
766 } else if (!strcmp(name, "!delete")) {
767 fmr->flags &= ~NXFMF_DELETE;
768 } else if (!strcmp(name, "!modify")) {
769 fmr->flags &= ~NXFMF_MODIFY;
770 } else if (!strcmp(name, "!actions")) {
771 fmr->flags &= ~NXFMF_ACTIONS;
772 } else if (!strcmp(name, "!own")) {
773 fmr->flags &= ~NXFMF_OWN;
774 } else if (parse_protocol(name, &p)) {
775 cls_rule_set_dl_type(&fmr->match, htons(p->dl_type));
777 cls_rule_set_nw_proto(&fmr->match, p->nw_proto);
782 value = strtok_r(NULL, ", \t\r\n", &save_ptr);
784 ovs_fatal(0, "%s: field %s missing value", str_, name);
787 if (!strcmp(name, "table")) {
788 fmr->table_id = str_to_table_id(value);
789 } else if (!strcmp(name, "out_port")) {
790 fmr->out_port = atoi(value);
791 } else if (mf_from_name(name)) {
792 parse_field(mf_from_name(name), value, &fmr->match);
794 ovs_fatal(0, "%s: unknown keyword %s", str_, name);
801 /* Parses 's' as a set of OpenFlow actions and appends the actions to
804 * Prints an error on stderr and aborts the program if 's' syntax is
807 parse_ofpacts(const char *s_, struct ofpbuf *ofpacts)
809 char *s = xstrdup(s_);
810 str_to_ofpacts(NULL, s, ofpacts);
814 /* Parses 'string' as an OFPT_FLOW_MOD or NXT_FLOW_MOD with command 'command'
815 * (one of OFPFC_*) into 'fm'. */
817 parse_ofp_flow_mod_str(struct ofputil_flow_mod *fm, const char *string,
818 uint16_t command, bool verbose)
820 struct cls_rule rule_copy;
822 parse_ofp_str(fm, command, string, verbose);
824 /* Normalize a copy of the rule. This ensures that non-normalized flows
825 * get logged but doesn't affect what gets sent to the switch, so that the
826 * switch can do whatever it likes with the flow. */
828 ofputil_normalize_rule(&rule_copy);
832 parse_ofp_flow_mod_file(const char *file_name, uint16_t command,
833 struct ofputil_flow_mod **fms, size_t *n_fms)
835 size_t allocated_fms;
839 stream = !strcmp(file_name, "-") ? stdin : fopen(file_name, "r");
840 if (stream == NULL) {
841 ovs_fatal(errno, "%s: open", file_name);
844 allocated_fms = *n_fms;
846 while (!ds_get_preprocessed_line(&s, stream)) {
847 if (*n_fms >= allocated_fms) {
848 *fms = x2nrealloc(*fms, &allocated_fms, sizeof **fms);
850 parse_ofp_flow_mod_str(&(*fms)[*n_fms], ds_cstr(&s), command, false);
855 if (stream != stdin) {
861 parse_ofp_flow_stats_request_str(struct ofputil_flow_stats_request *fsr,
862 bool aggregate, const char *string)
864 struct ofputil_flow_mod fm;
866 parse_ofp_str(&fm, -1, string, false);
867 fsr->aggregate = aggregate;
868 fsr->cookie = fm.cookie;
869 fsr->cookie_mask = fm.cookie_mask;
871 fsr->out_port = fm.out_port;
872 fsr->table_id = fm.table_id;
875 /* Parses a specification of a flow from 's' into 'flow'. 's' must take the
876 * form FIELD=VALUE[,FIELD=VALUE]... where each FIELD is the name of a
877 * mf_field. Fields must be specified in a natural order for satisfying
880 * Returns NULL on success, otherwise a malloc()'d string that explains the
883 parse_ofp_exact_flow(struct flow *flow, const char *s)
885 char *pos, *key, *value_s;
889 memset(flow, 0, sizeof *flow);
891 pos = copy = xstrdup(s);
892 while (ofputil_parse_key_value(&pos, &key, &value_s)) {
893 const struct protocol *p;
894 if (parse_protocol(key, &p)) {
896 error = xasprintf("%s: Ethernet type set multiple times", s);
899 flow->dl_type = htons(p->dl_type);
902 if (flow->nw_proto) {
903 error = xasprintf("%s: network protocol set "
904 "multiple times", s);
907 flow->nw_proto = p->nw_proto;
910 const struct mf_field *mf;
911 union mf_value value;
914 mf = mf_from_name(key);
916 error = xasprintf("%s: unknown field %s", s, key);
920 if (!mf_are_prereqs_ok(mf, flow)) {
921 error = xasprintf("%s: prerequisites not met for setting %s",
926 if (!mf_is_zero(mf, flow)) {
927 error = xasprintf("%s: field %s set multiple times", s, key);
931 field_error = mf_parse_value(mf, value_s, &value);
933 error = xasprintf("%s: bad value for %s (%s)",
934 s, key, field_error);
939 mf_set_flow_value(mf, &value, flow);
947 memset(flow, 0, sizeof *flow);