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 resubmit->in_port = ofputil_port_from_string(in_port_s);
172 if (!resubmit->in_port) {
173 ovs_fatal(0, "%s: resubmit to unknown port", in_port_s);
176 resubmit->in_port = OFPP_IN_PORT;
179 table_s = strsep(&arg, ",");
180 resubmit->table_id = table_s && table_s[0] ? str_to_u32(table_s) : 255;
182 if (resubmit->in_port == OFPP_IN_PORT && resubmit->table_id == 255) {
183 ovs_fatal(0, "at least one \"in_port\" or \"table\" must be specified "
189 parse_note(const char *arg, struct ofpbuf *ofpacts)
191 struct ofpact_note *note;
193 note = ofpact_put_NOTE(ofpacts);
194 while (*arg != '\0') {
205 byte = hexits_value(arg, 2, &ok);
207 ovs_fatal(0, "bad hex digit in `note' argument");
209 ofpbuf_put(ofpacts, &byte, 1);
216 ofpact_update_len(ofpacts, ¬e->ofpact);
220 parse_fin_timeout(struct ofpbuf *b, char *arg)
222 struct ofpact_fin_timeout *oft = ofpact_put_FIN_TIMEOUT(b);
225 while (ofputil_parse_key_value(&arg, &key, &value)) {
226 if (!strcmp(key, "idle_timeout")) {
227 oft->fin_idle_timeout = str_to_u16(value, key);
228 } else if (!strcmp(key, "hard_timeout")) {
229 oft->fin_hard_timeout = str_to_u16(value, key);
231 ovs_fatal(0, "invalid key '%s' in 'fin_timeout' argument", key);
237 parse_controller(struct ofpbuf *b, char *arg)
239 enum ofp_packet_in_reason reason = OFPR_ACTION;
240 uint16_t controller_id = 0;
241 uint16_t max_len = UINT16_MAX;
245 } else if (strspn(arg, "0123456789") == strlen(arg)) {
246 max_len = str_to_u16(arg, "max_len");
250 while (ofputil_parse_key_value(&arg, &name, &value)) {
251 if (!strcmp(name, "reason")) {
252 if (!ofputil_packet_in_reason_from_string(value, &reason)) {
253 ovs_fatal(0, "unknown reason \"%s\"", value);
255 } else if (!strcmp(name, "max_len")) {
256 max_len = str_to_u16(value, "max_len");
257 } else if (!strcmp(name, "id")) {
258 controller_id = str_to_u16(value, "id");
260 ovs_fatal(0, "unknown key \"%s\" parsing controller action",
266 if (reason == OFPR_ACTION && controller_id == 0) {
267 struct ofpact_output *output;
269 output = ofpact_put_OUTPUT(b);
270 output->port = OFPP_CONTROLLER;
271 output->max_len = max_len;
273 struct ofpact_controller *controller;
275 controller = ofpact_put_CONTROLLER(b);
276 controller->max_len = max_len;
277 controller->reason = reason;
278 controller->controller_id = controller_id;
283 parse_dec_ttl(struct ofpbuf *b, char *arg)
285 struct ofpact_cnt_ids *ids;
287 ids = ofpact_put_DEC_TTL(b);
292 ids->ofpact.compat = OFPUTIL_NXAST_DEC_TTL;
293 ofpbuf_put(b, &id, sizeof id);
295 ids->n_controllers++;
299 ids->ofpact.compat = OFPUTIL_NXAST_DEC_TTL_CNT_IDS;
300 for (cntr = strtok_r(arg, ", ", &arg); cntr != NULL;
301 cntr = strtok_r(NULL, ", ", &arg)) {
302 uint16_t id = atoi(cntr);
304 ofpbuf_put(b, &id, sizeof id);
306 ids->n_controllers++;
308 if (!ids->n_controllers) {
309 ovs_fatal(0, "dec_ttl_cnt_ids: expected at least one controller "
314 ofpact_update_len(b, &ids->ofpact);
318 parse_named_action(enum ofputil_action_code code, const struct flow *flow,
319 char *arg, struct ofpbuf *ofpacts)
321 struct ofpact_tunnel *tunnel;
328 case OFPUTIL_ACTION_INVALID:
331 case OFPUTIL_OFPAT10_OUTPUT:
332 case OFPUTIL_OFPAT11_OUTPUT:
333 parse_output(arg, ofpacts);
336 case OFPUTIL_OFPAT10_SET_VLAN_VID:
337 case OFPUTIL_OFPAT11_SET_VLAN_VID:
338 vid = str_to_u32(arg);
339 if (vid & ~VLAN_VID_MASK) {
340 ovs_fatal(0, "%s: not a valid VLAN VID", arg);
342 ofpact_put_SET_VLAN_VID(ofpacts)->vlan_vid = vid;
345 case OFPUTIL_OFPAT10_SET_VLAN_PCP:
346 case OFPUTIL_OFPAT11_SET_VLAN_PCP:
347 pcp = str_to_u32(arg);
349 ovs_fatal(0, "%s: not a valid VLAN PCP", arg);
351 ofpact_put_SET_VLAN_PCP(ofpacts)->vlan_pcp = pcp;
354 case OFPUTIL_OFPAT12_SET_FIELD:
355 NOT_REACHED(); /* This will be implemented by later patch and
356 * enabled using a non-NULL name in
357 * OFPAT12_ACTION(OFPAT12_SET_FIELD, ...) */
360 case OFPUTIL_OFPAT10_STRIP_VLAN:
361 ofpact_put_STRIP_VLAN(ofpacts);
364 case OFPUTIL_OFPAT10_SET_DL_SRC:
365 case OFPUTIL_OFPAT11_SET_DL_SRC:
366 str_to_mac(arg, ofpact_put_SET_ETH_SRC(ofpacts)->mac);
369 case OFPUTIL_OFPAT10_SET_DL_DST:
370 case OFPUTIL_OFPAT11_SET_DL_DST:
371 str_to_mac(arg, ofpact_put_SET_ETH_DST(ofpacts)->mac);
374 case OFPUTIL_OFPAT10_SET_NW_SRC:
375 case OFPUTIL_OFPAT11_SET_NW_SRC:
377 ofpact_put_SET_IPV4_SRC(ofpacts)->ipv4 = ip;
380 case OFPUTIL_OFPAT10_SET_NW_DST:
381 case OFPUTIL_OFPAT11_SET_NW_DST:
383 ofpact_put_SET_IPV4_DST(ofpacts)->ipv4 = ip;
386 case OFPUTIL_OFPAT10_SET_NW_TOS:
387 case OFPUTIL_OFPAT11_SET_NW_TOS:
388 tos = str_to_u32(arg);
389 if (tos & ~IP_DSCP_MASK) {
390 ovs_fatal(0, "%s: not a valid TOS", arg);
392 ofpact_put_SET_IPV4_DSCP(ofpacts)->dscp = tos;
395 case OFPUTIL_OFPAT10_SET_TP_SRC:
396 case OFPUTIL_OFPAT11_SET_TP_SRC:
397 ofpact_put_SET_L4_SRC_PORT(ofpacts)->port = str_to_u32(arg);
400 case OFPUTIL_OFPAT10_SET_TP_DST:
401 case OFPUTIL_OFPAT11_SET_TP_DST:
402 ofpact_put_SET_L4_DST_PORT(ofpacts)->port = str_to_u32(arg);
405 case OFPUTIL_OFPAT10_ENQUEUE:
406 parse_enqueue(arg, ofpacts);
409 case OFPUTIL_NXAST_RESUBMIT:
410 parse_resubmit(arg, ofpacts);
413 case OFPUTIL_NXAST_SET_TUNNEL:
414 case OFPUTIL_NXAST_SET_TUNNEL64:
415 tunnel = ofpact_put_SET_TUNNEL(ofpacts);
416 tunnel->ofpact.compat = code;
417 tunnel->tun_id = str_to_u64(arg);
420 case OFPUTIL_NXAST_SET_QUEUE:
421 ofpact_put_SET_QUEUE(ofpacts)->queue_id = str_to_u32(arg);
424 case OFPUTIL_NXAST_POP_QUEUE:
425 ofpact_put_POP_QUEUE(ofpacts);
428 case OFPUTIL_NXAST_REG_MOVE:
429 nxm_parse_reg_move(ofpact_put_REG_MOVE(ofpacts), arg);
432 case OFPUTIL_NXAST_REG_LOAD:
433 nxm_parse_reg_load(ofpact_put_REG_LOAD(ofpacts), arg);
436 case OFPUTIL_NXAST_NOTE:
437 parse_note(arg, ofpacts);
440 case OFPUTIL_NXAST_MULTIPATH:
441 multipath_parse(ofpact_put_MULTIPATH(ofpacts), arg);
444 case OFPUTIL_NXAST_AUTOPATH__DEPRECATED:
445 autopath_parse(ofpact_put_AUTOPATH(ofpacts), arg);
448 case OFPUTIL_NXAST_BUNDLE:
449 bundle_parse(arg, ofpacts);
452 case OFPUTIL_NXAST_BUNDLE_LOAD:
453 bundle_parse_load(arg, ofpacts);
456 case OFPUTIL_NXAST_RESUBMIT_TABLE:
457 case OFPUTIL_NXAST_OUTPUT_REG:
458 case OFPUTIL_NXAST_DEC_TTL_CNT_IDS:
461 case OFPUTIL_NXAST_LEARN:
462 learn_parse(arg, flow, ofpacts);
465 case OFPUTIL_NXAST_EXIT:
466 ofpact_put_EXIT(ofpacts);
469 case OFPUTIL_NXAST_DEC_TTL:
470 parse_dec_ttl(ofpacts, arg);
473 case OFPUTIL_NXAST_FIN_TIMEOUT:
474 parse_fin_timeout(ofpacts, arg);
477 case OFPUTIL_NXAST_CONTROLLER:
478 parse_controller(ofpacts, arg);
484 str_to_ofpacts(const struct flow *flow, char *str, struct ofpbuf *ofpacts)
486 char *pos, *act, *arg;
491 while (ofputil_parse_key_value(&pos, &act, &arg)) {
492 int code = ofputil_action_code_from_name(act);
494 parse_named_action(code, flow, arg, ofpacts);
495 } else if (!strcasecmp(act, "drop")) {
497 ovs_fatal(0, "Drop actions must not be preceded by other "
499 } else if (ofputil_parse_key_value(&pos, &act, &arg)) {
500 ovs_fatal(0, "Drop actions must not be followed by other "
505 uint16_t port = ofputil_port_from_string(act);
507 ofpact_put_OUTPUT(ofpacts)->port = port;
509 ovs_fatal(0, "Unknown action: %s", act);
524 parse_protocol(const char *name, const struct protocol **p_out)
526 static const struct protocol protocols[] = {
527 { "ip", ETH_TYPE_IP, 0 },
528 { "arp", ETH_TYPE_ARP, 0 },
529 { "icmp", ETH_TYPE_IP, IPPROTO_ICMP },
530 { "tcp", ETH_TYPE_IP, IPPROTO_TCP },
531 { "udp", ETH_TYPE_IP, IPPROTO_UDP },
532 { "ipv6", ETH_TYPE_IPV6, 0 },
533 { "ip6", ETH_TYPE_IPV6, 0 },
534 { "icmp6", ETH_TYPE_IPV6, IPPROTO_ICMPV6 },
535 { "tcp6", ETH_TYPE_IPV6, IPPROTO_TCP },
536 { "udp6", ETH_TYPE_IPV6, IPPROTO_UDP },
538 const struct protocol *p;
540 for (p = protocols; p < &protocols[ARRAY_SIZE(protocols)]; p++) {
541 if (!strcmp(p->name, name)) {
551 ofp_fatal(const char *flow, bool verbose, const char *format, ...)
556 fprintf(stderr, "%s:\n", flow);
559 va_start(args, format);
560 ovs_fatal_valist(0, format, args);
564 parse_field(const struct mf_field *mf, const char *s, struct match *match)
566 union mf_value value, mask;
569 error = mf_parse(mf, s, &value, &mask);
571 ovs_fatal(0, "%s", error);
574 mf_set(mf, &value, &mask, match);
577 /* Convert 'str_' (as described in the Flow Syntax section of the ovs-ofctl man
578 * page) into 'fm' for sending the specified flow_mod 'command' to a switch.
579 * If 'actions' is specified, an action must be in 'string' and may be expanded
582 * To parse syntax for an OFPT_FLOW_MOD (or NXT_FLOW_MOD), use an OFPFC_*
583 * constant for 'command'. To parse syntax for an OFPST_FLOW or
584 * OFPST_AGGREGATE (or NXST_FLOW or NXST_AGGREGATE), use -1 for 'command'. */
586 parse_ofp_str(struct ofputil_flow_mod *fm, int command, const char *str_,
596 char *string = xstrdup(str_);
597 char *save_ptr = NULL;
598 char *act_str = NULL;
607 fields = F_ACTIONS | F_TIMEOUT | F_PRIORITY | F_FLAGS;
614 case OFPFC_DELETE_STRICT:
615 fields = F_OUT_PORT | F_PRIORITY;
619 fields = F_ACTIONS | F_TIMEOUT | F_PRIORITY | F_FLAGS;
622 case OFPFC_MODIFY_STRICT:
623 fields = F_ACTIONS | F_TIMEOUT | F_PRIORITY | F_FLAGS;
630 match_init_catchall(&fm->match);
631 fm->priority = OFP_DEFAULT_PRIORITY;
632 fm->cookie = htonll(0);
633 fm->cookie_mask = htonll(0);
634 if (command == OFPFC_MODIFY || command == OFPFC_MODIFY_STRICT) {
635 /* For modify, by default, don't update the cookie. */
636 fm->new_cookie = htonll(UINT64_MAX);
638 fm->new_cookie = htonll(0);
641 fm->command = command;
642 fm->idle_timeout = OFP_FLOW_PERMANENT;
643 fm->hard_timeout = OFP_FLOW_PERMANENT;
644 fm->buffer_id = UINT32_MAX;
645 fm->out_port = OFPP_NONE;
647 if (fields & F_ACTIONS) {
648 act_str = strstr(string, "action");
650 ofp_fatal(str_, verbose, "must specify an action");
654 act_str = strchr(act_str + 1, '=');
656 ofp_fatal(str_, verbose, "must specify an action");
661 for (name = strtok_r(string, "=, \t\r\n", &save_ptr); name;
662 name = strtok_r(NULL, "=, \t\r\n", &save_ptr)) {
663 const struct protocol *p;
665 if (parse_protocol(name, &p)) {
666 match_set_dl_type(&fm->match, htons(p->dl_type));
668 match_set_nw_proto(&fm->match, p->nw_proto);
670 } else if (fields & F_FLAGS && !strcmp(name, "send_flow_rem")) {
671 fm->flags |= OFPFF_SEND_FLOW_REM;
672 } else if (fields & F_FLAGS && !strcmp(name, "check_overlap")) {
673 fm->flags |= OFPFF_CHECK_OVERLAP;
677 value = strtok_r(NULL, ", \t\r\n", &save_ptr);
679 ofp_fatal(str_, verbose, "field %s missing value", name);
682 if (!strcmp(name, "table")) {
683 fm->table_id = str_to_table_id(value);
684 } else if (!strcmp(name, "out_port")) {
685 fm->out_port = ofputil_port_from_string(name);
687 ofp_fatal(str_, verbose, "%s is not a valid OpenFlow port",
690 } else if (fields & F_PRIORITY && !strcmp(name, "priority")) {
691 fm->priority = str_to_u16(value, name);
692 } else if (fields & F_TIMEOUT && !strcmp(name, "idle_timeout")) {
693 fm->idle_timeout = str_to_u16(value, name);
694 } else if (fields & F_TIMEOUT && !strcmp(name, "hard_timeout")) {
695 fm->hard_timeout = str_to_u16(value, name);
696 } else if (!strcmp(name, "cookie")) {
697 char *mask = strchr(value, '/');
700 /* A mask means we're searching for a cookie. */
701 if (command == OFPFC_ADD) {
702 ofp_fatal(str_, verbose, "flow additions cannot use "
706 fm->cookie = htonll(str_to_u64(value));
707 fm->cookie_mask = htonll(str_to_u64(mask+1));
709 /* No mask means that the cookie is being set. */
710 if (command != OFPFC_ADD && command != OFPFC_MODIFY
711 && command != OFPFC_MODIFY_STRICT) {
712 ofp_fatal(str_, verbose, "cannot set cookie");
714 fm->new_cookie = htonll(str_to_u64(value));
716 } else if (mf_from_name(name)) {
717 parse_field(mf_from_name(name), value, &fm->match);
718 } else if (!strcmp(name, "duration")
719 || !strcmp(name, "n_packets")
720 || !strcmp(name, "n_bytes")) {
721 /* Ignore these, so that users can feed the output of
722 * "ovs-ofctl dump-flows" back into commands that parse
725 ofp_fatal(str_, verbose, "unknown keyword %s", name);
729 if (!fm->cookie_mask && fm->new_cookie == htonll(UINT64_MAX)
730 && (command == OFPFC_MODIFY || command == OFPFC_MODIFY_STRICT)) {
731 /* On modifies without a mask, we are supposed to add a flow if
732 * one does not exist. If a cookie wasn't been specified, use a
733 * default of zero. */
734 fm->new_cookie = htonll(0);
736 if (fields & F_ACTIONS) {
737 struct ofpbuf ofpacts;
739 ofpbuf_init(&ofpacts, 32);
740 str_to_ofpacts(&fm->match.flow, act_str, &ofpacts);
741 fm->ofpacts_len = ofpacts.size;
742 fm->ofpacts = ofpbuf_steal_data(&ofpacts);
751 /* Convert 'str_' (as described in the documentation for the "monitor" command
752 * in the ovs-ofctl man page) into 'fmr'. */
754 parse_flow_monitor_request(struct ofputil_flow_monitor_request *fmr,
759 char *string = xstrdup(str_);
760 char *save_ptr = NULL;
764 fmr->flags = (NXFMF_INITIAL | NXFMF_ADD | NXFMF_DELETE | NXFMF_MODIFY
765 | NXFMF_OWN | NXFMF_ACTIONS);
766 fmr->out_port = OFPP_NONE;
767 fmr->table_id = 0xff;
768 match_init_catchall(&fmr->match);
770 for (name = strtok_r(string, "=, \t\r\n", &save_ptr); name;
771 name = strtok_r(NULL, "=, \t\r\n", &save_ptr)) {
772 const struct protocol *p;
774 if (!strcmp(name, "!initial")) {
775 fmr->flags &= ~NXFMF_INITIAL;
776 } else if (!strcmp(name, "!add")) {
777 fmr->flags &= ~NXFMF_ADD;
778 } else if (!strcmp(name, "!delete")) {
779 fmr->flags &= ~NXFMF_DELETE;
780 } else if (!strcmp(name, "!modify")) {
781 fmr->flags &= ~NXFMF_MODIFY;
782 } else if (!strcmp(name, "!actions")) {
783 fmr->flags &= ~NXFMF_ACTIONS;
784 } else if (!strcmp(name, "!own")) {
785 fmr->flags &= ~NXFMF_OWN;
786 } else if (parse_protocol(name, &p)) {
787 match_set_dl_type(&fmr->match, htons(p->dl_type));
789 match_set_nw_proto(&fmr->match, p->nw_proto);
794 value = strtok_r(NULL, ", \t\r\n", &save_ptr);
796 ovs_fatal(0, "%s: field %s missing value", str_, name);
799 if (!strcmp(name, "table")) {
800 fmr->table_id = str_to_table_id(value);
801 } else if (!strcmp(name, "out_port")) {
802 fmr->out_port = atoi(value);
803 } else if (mf_from_name(name)) {
804 parse_field(mf_from_name(name), value, &fmr->match);
806 ovs_fatal(0, "%s: unknown keyword %s", str_, name);
813 /* Parses 's' as a set of OpenFlow actions and appends the actions to
816 * Prints an error on stderr and aborts the program if 's' syntax is
819 parse_ofpacts(const char *s_, struct ofpbuf *ofpacts)
821 char *s = xstrdup(s_);
822 str_to_ofpacts(NULL, s, ofpacts);
826 /* Parses 'string' as an OFPT_FLOW_MOD or NXT_FLOW_MOD with command 'command'
827 * (one of OFPFC_*) into 'fm'. */
829 parse_ofp_flow_mod_str(struct ofputil_flow_mod *fm, const char *string,
830 uint16_t command, bool verbose)
832 struct match match_copy;
834 parse_ofp_str(fm, command, string, verbose);
836 /* Normalize a copy of the match. This ensures that non-normalized flows
837 * get logged but doesn't affect what gets sent to the switch, so that the
838 * switch can do whatever it likes with the flow. */
839 match_copy = fm->match;
840 ofputil_normalize_match(&match_copy);
844 parse_ofp_flow_mod_file(const char *file_name, uint16_t command,
845 struct ofputil_flow_mod **fms, size_t *n_fms)
847 size_t allocated_fms;
851 stream = !strcmp(file_name, "-") ? stdin : fopen(file_name, "r");
852 if (stream == NULL) {
853 ovs_fatal(errno, "%s: open", file_name);
856 allocated_fms = *n_fms;
858 while (!ds_get_preprocessed_line(&s, stream)) {
859 if (*n_fms >= allocated_fms) {
860 *fms = x2nrealloc(*fms, &allocated_fms, sizeof **fms);
862 parse_ofp_flow_mod_str(&(*fms)[*n_fms], ds_cstr(&s), command, false);
867 if (stream != stdin) {
873 parse_ofp_flow_stats_request_str(struct ofputil_flow_stats_request *fsr,
874 bool aggregate, const char *string)
876 struct ofputil_flow_mod fm;
878 parse_ofp_str(&fm, -1, string, false);
879 fsr->aggregate = aggregate;
880 fsr->cookie = fm.cookie;
881 fsr->cookie_mask = fm.cookie_mask;
882 fsr->match = fm.match;
883 fsr->out_port = fm.out_port;
884 fsr->table_id = fm.table_id;
887 /* Parses a specification of a flow from 's' into 'flow'. 's' must take the
888 * form FIELD=VALUE[,FIELD=VALUE]... where each FIELD is the name of a
889 * mf_field. Fields must be specified in a natural order for satisfying
892 * Returns NULL on success, otherwise a malloc()'d string that explains the
895 parse_ofp_exact_flow(struct flow *flow, const char *s)
897 char *pos, *key, *value_s;
901 memset(flow, 0, sizeof *flow);
903 pos = copy = xstrdup(s);
904 while (ofputil_parse_key_value(&pos, &key, &value_s)) {
905 const struct protocol *p;
906 if (parse_protocol(key, &p)) {
908 error = xasprintf("%s: Ethernet type set multiple times", s);
911 flow->dl_type = htons(p->dl_type);
914 if (flow->nw_proto) {
915 error = xasprintf("%s: network protocol set "
916 "multiple times", s);
919 flow->nw_proto = p->nw_proto;
922 const struct mf_field *mf;
923 union mf_value value;
926 mf = mf_from_name(key);
928 error = xasprintf("%s: unknown field %s", s, key);
932 if (!mf_are_prereqs_ok(mf, flow)) {
933 error = xasprintf("%s: prerequisites not met for setting %s",
938 if (!mf_is_zero(mf, flow)) {
939 error = xasprintf("%s: field %s set multiple times", s, key);
943 field_error = mf_parse_value(mf, value_s, &value);
945 error = xasprintf("%s: bad value for %s (%s)",
946 s, key, field_error);
951 mf_set_flow_value(mf, &value, flow);
959 memset(flow, 0, sizeof *flow);