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.
21 #include <netinet/icmp6.h>
23 #include "classifier.h"
24 #include "dynamic-string.h"
25 #include "meta-flow.h"
26 #include "ofp-actions.h"
27 #include "ofp-errors.h"
30 #include "openflow/nicira-ext.h"
32 #include "unaligned.h"
36 VLOG_DEFINE_THIS_MODULE(nx_match);
38 /* Rate limit for nx_match parse errors. These always indicate a bug in the
39 * peer and so there's not much point in showing a lot of them. */
40 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
42 /* Returns the width of the data for a field with the given 'header', in
45 nxm_field_bytes(uint32_t header)
47 unsigned int length = NXM_LENGTH(header);
48 return NXM_HASMASK(header) ? length / 2 : length;
51 /* Returns the width of the data for a field with the given 'header', in
54 nxm_field_bits(uint32_t header)
56 return nxm_field_bytes(header) * 8;
59 /* nx_pull_match() and helpers. */
62 nx_entry_ok(const void *p, unsigned int match_len)
64 unsigned int payload_len;
70 VLOG_DBG_RL(&rl, "nx_match ends with partial (%u-byte) nxm_header",
75 memcpy(&header_be, p, 4);
76 header = ntohl(header_be);
78 payload_len = NXM_LENGTH(header);
80 VLOG_DBG_RL(&rl, "nxm_entry %08"PRIx32" has invalid payload "
84 if (match_len < payload_len + 4) {
85 VLOG_DBG_RL(&rl, "%"PRIu32"-byte nxm_entry but only "
86 "%u bytes left in nx_match", payload_len + 4, match_len);
94 nx_pull_match__(struct ofpbuf *b, unsigned int match_len, bool strict,
95 uint16_t priority, struct cls_rule *rule,
96 ovs_be64 *cookie, ovs_be64 *cookie_mask)
101 assert((cookie != NULL) == (cookie_mask != NULL));
103 cls_rule_init_catchall(rule, priority);
105 *cookie = *cookie_mask = htonll(0);
111 p = ofpbuf_try_pull(b, ROUND_UP(match_len, 8));
113 VLOG_DBG_RL(&rl, "nx_match length %u, rounded up to a "
114 "multiple of 8, is longer than space in message (max "
115 "length %zu)", match_len, b->size);
116 return OFPERR_OFPBMC_BAD_LEN;
120 (header = nx_entry_ok(p, match_len)) != 0;
121 p += 4 + NXM_LENGTH(header), match_len -= 4 + NXM_LENGTH(header)) {
122 const struct mf_field *mf;
125 mf = mf_from_nxm_header(header);
128 error = OFPERR_OFPBMC_BAD_FIELD;
132 } else if (!mf_are_prereqs_ok(mf, &rule->flow)) {
133 error = OFPERR_OFPBMC_BAD_PREREQ;
134 } else if (!mf_is_all_wild(mf, &rule->wc)) {
135 error = OFPERR_OFPBMC_DUP_FIELD;
136 } else if (header != OXM_OF_IN_PORT) {
137 unsigned int width = mf->n_bytes;
138 union mf_value value;
140 memcpy(&value, p + 4, width);
141 if (!mf_is_value_valid(mf, &value)) {
142 error = OFPERR_OFPBMC_BAD_VALUE;
143 } else if (!NXM_HASMASK(header)) {
145 mf_set_value(mf, &value, rule);
149 memcpy(&mask, p + 4 + width, width);
150 if (!mf_is_mask_valid(mf, &mask)) {
151 error = OFPERR_OFPBMC_BAD_MASK;
154 mf_set(mf, &value, &mask, rule);
158 /* Special case for 32bit ports when using OXM,
159 * ports are 16 bits wide otherwise. */
163 memcpy(&port_of11, p + 4, sizeof port_of11);
164 error = ofputil_port_from_ofp11(port_of11, &port);
166 cls_rule_set_in_port(rule, port);
170 /* Check if the match is for a cookie rather than a classifier rule. */
171 if ((header == NXM_NX_COOKIE || header == NXM_NX_COOKIE_W) && cookie) {
173 error = OFPERR_OFPBMC_DUP_FIELD;
175 unsigned int width = sizeof *cookie;
177 memcpy(cookie, p + 4, width);
178 if (NXM_HASMASK(header)) {
179 memcpy(cookie_mask, p + 4 + width, width);
181 *cookie_mask = htonll(UINT64_MAX);
188 VLOG_DBG_RL(&rl, "bad nxm_entry %#08"PRIx32" (vendor=%"PRIu32", "
189 "field=%"PRIu32", hasmask=%"PRIu32", len=%"PRIu32"), "
191 NXM_VENDOR(header), NXM_FIELD(header),
192 NXM_HASMASK(header), NXM_LENGTH(header),
193 ofperr_to_string(error));
198 return match_len ? OFPERR_OFPBMC_BAD_LEN : 0;
201 /* Parses the nx_match formatted match description in 'b' with length
202 * 'match_len'. The results are stored in 'rule', which is initialized with
203 * 'priority'. If 'cookie' and 'cookie_mask' contain valid pointers, then the
204 * cookie and mask will be stored in them if a "NXM_NX_COOKIE*" match is
205 * defined. Otherwise, 0 is stored in both.
207 * Fails with an error when encountering unknown NXM headers.
209 * Returns 0 if successful, otherwise an OpenFlow error code. */
211 nx_pull_match(struct ofpbuf *b, unsigned int match_len,
212 uint16_t priority, struct cls_rule *rule,
213 ovs_be64 *cookie, ovs_be64 *cookie_mask)
215 return nx_pull_match__(b, match_len, true, priority, rule, cookie,
219 /* Behaves the same as nx_pull_match() with one exception. Skips over unknown
220 * NXM headers instead of failing with an error when they are encountered. */
222 nx_pull_match_loose(struct ofpbuf *b, unsigned int match_len,
223 uint16_t priority, struct cls_rule *rule,
224 ovs_be64 *cookie, ovs_be64 *cookie_mask)
226 return nx_pull_match__(b, match_len, false, priority, rule, cookie,
230 /* nx_put_match() and helpers.
232 * 'put' functions whose names end in 'w' add a wildcarded field.
233 * 'put' functions whose names end in 'm' add a field that might be wildcarded.
234 * Other 'put' functions add exact-match fields.
238 nxm_put_header(struct ofpbuf *b, uint32_t header)
240 ovs_be32 n_header = htonl(header);
241 ofpbuf_put(b, &n_header, sizeof n_header);
245 nxm_put_8(struct ofpbuf *b, uint32_t header, uint8_t value)
247 nxm_put_header(b, header);
248 ofpbuf_put(b, &value, sizeof value);
252 nxm_put_8m(struct ofpbuf *b, uint32_t header, uint8_t value, uint8_t mask)
259 nxm_put_8(b, header, value);
263 nxm_put_header(b, NXM_MAKE_WILD_HEADER(header));
264 ofpbuf_put(b, &value, sizeof value);
265 ofpbuf_put(b, &mask, sizeof mask);
270 nxm_put_16(struct ofpbuf *b, uint32_t header, ovs_be16 value)
272 nxm_put_header(b, header);
273 ofpbuf_put(b, &value, sizeof value);
277 nxm_put_16w(struct ofpbuf *b, uint32_t header, ovs_be16 value, ovs_be16 mask)
279 nxm_put_header(b, header);
280 ofpbuf_put(b, &value, sizeof value);
281 ofpbuf_put(b, &mask, sizeof mask);
285 nxm_put_16m(struct ofpbuf *b, uint32_t header, ovs_be16 value, ovs_be16 mask)
291 case CONSTANT_HTONS(UINT16_MAX):
292 nxm_put_16(b, header, value);
296 nxm_put_16w(b, NXM_MAKE_WILD_HEADER(header), value, mask);
302 nxm_put_32(struct ofpbuf *b, uint32_t header, ovs_be32 value)
304 nxm_put_header(b, header);
305 ofpbuf_put(b, &value, sizeof value);
309 nxm_put_32w(struct ofpbuf *b, uint32_t header, ovs_be32 value, ovs_be32 mask)
311 nxm_put_header(b, header);
312 ofpbuf_put(b, &value, sizeof value);
313 ofpbuf_put(b, &mask, sizeof mask);
317 nxm_put_32m(struct ofpbuf *b, uint32_t header, ovs_be32 value, ovs_be32 mask)
323 case CONSTANT_HTONL(UINT32_MAX):
324 nxm_put_32(b, header, value);
328 nxm_put_32w(b, NXM_MAKE_WILD_HEADER(header), value, mask);
334 nxm_put_64(struct ofpbuf *b, uint32_t header, ovs_be64 value)
336 nxm_put_header(b, header);
337 ofpbuf_put(b, &value, sizeof value);
341 nxm_put_64w(struct ofpbuf *b, uint32_t header, ovs_be64 value, ovs_be64 mask)
343 nxm_put_header(b, header);
344 ofpbuf_put(b, &value, sizeof value);
345 ofpbuf_put(b, &mask, sizeof mask);
349 nxm_put_64m(struct ofpbuf *b, uint32_t header, ovs_be64 value, ovs_be64 mask)
355 case CONSTANT_HTONLL(UINT64_MAX):
356 nxm_put_64(b, header, value);
360 nxm_put_64w(b, NXM_MAKE_WILD_HEADER(header), value, mask);
366 nxm_put_eth(struct ofpbuf *b, uint32_t header,
367 const uint8_t value[ETH_ADDR_LEN])
369 nxm_put_header(b, header);
370 ofpbuf_put(b, value, ETH_ADDR_LEN);
374 nxm_put_eth_masked(struct ofpbuf *b, uint32_t header,
375 const uint8_t value[ETH_ADDR_LEN],
376 const uint8_t mask[ETH_ADDR_LEN])
378 if (!eth_addr_is_zero(mask)) {
379 if (eth_mask_is_exact(mask)) {
380 nxm_put_eth(b, header, value);
382 nxm_put_header(b, NXM_MAKE_WILD_HEADER(header));
383 ofpbuf_put(b, value, ETH_ADDR_LEN);
384 ofpbuf_put(b, mask, ETH_ADDR_LEN);
390 nxm_put_ipv6(struct ofpbuf *b, uint32_t header,
391 const struct in6_addr *value, const struct in6_addr *mask)
393 if (ipv6_mask_is_any(mask)) {
395 } else if (ipv6_mask_is_exact(mask)) {
396 nxm_put_header(b, header);
397 ofpbuf_put(b, value, sizeof *value);
399 nxm_put_header(b, NXM_MAKE_WILD_HEADER(header));
400 ofpbuf_put(b, value, sizeof *value);
401 ofpbuf_put(b, mask, sizeof *mask);
406 nxm_put_frag(struct ofpbuf *b, const struct cls_rule *cr)
408 uint8_t nw_frag = cr->flow.nw_frag;
409 uint8_t nw_frag_mask = cr->wc.nw_frag_mask;
411 switch (nw_frag_mask) {
415 case FLOW_NW_FRAG_MASK:
416 nxm_put_8(b, NXM_NX_IP_FRAG, nw_frag);
420 nxm_put_8m(b, NXM_NX_IP_FRAG, nw_frag,
421 nw_frag_mask & FLOW_NW_FRAG_MASK);
427 nxm_put_ip(struct ofpbuf *b, const struct cls_rule *cr,
428 uint8_t icmp_proto, uint32_t icmp_type, uint32_t icmp_code,
431 const flow_wildcards_t wc = cr->wc.wildcards;
432 const struct flow *flow = &cr->flow;
436 if (!(wc & FWW_NW_DSCP)) {
437 nxm_put_8(b, oxm ? OXM_OF_IP_DSCP : NXM_OF_IP_TOS,
438 flow->nw_tos & IP_DSCP_MASK);
441 if (!(wc & FWW_NW_ECN)) {
442 nxm_put_8(b, oxm ? OXM_OF_IP_ECN : NXM_NX_IP_ECN,
443 flow->nw_tos & IP_ECN_MASK);
446 if (!oxm && !(wc & FWW_NW_TTL)) {
447 nxm_put_8(b, NXM_NX_IP_TTL, flow->nw_ttl);
450 if (!(wc & FWW_NW_PROTO)) {
451 nxm_put_8(b, oxm ? OXM_OF_IP_PROTO : NXM_OF_IP_PROTO, flow->nw_proto);
453 if (flow->nw_proto == IPPROTO_TCP) {
454 nxm_put_16m(b, oxm ? OXM_OF_TCP_SRC : NXM_OF_TCP_SRC,
455 flow->tp_src, cr->wc.tp_src_mask);
456 nxm_put_16m(b, oxm ? OXM_OF_TCP_DST : NXM_OF_TCP_DST,
457 flow->tp_dst, cr->wc.tp_dst_mask);
458 } else if (flow->nw_proto == IPPROTO_UDP) {
459 nxm_put_16m(b, oxm ? OXM_OF_UDP_SRC : NXM_OF_UDP_SRC,
460 flow->tp_src, cr->wc.tp_src_mask);
461 nxm_put_16m(b, oxm ? OXM_OF_UDP_DST : NXM_OF_UDP_DST,
462 flow->tp_dst, cr->wc.tp_dst_mask);
463 } else if (flow->nw_proto == icmp_proto) {
464 if (cr->wc.tp_src_mask) {
465 nxm_put_8(b, icmp_type, ntohs(flow->tp_src));
467 if (cr->wc.tp_dst_mask) {
468 nxm_put_8(b, icmp_code, ntohs(flow->tp_dst));
474 /* Appends to 'b' the nx_match format that expresses 'cr' (except for
475 * 'cr->priority', because priority is not part of nx_match), plus enough
476 * zero bytes to pad the nx_match out to a multiple of 8. For Flow Mod
477 * and Flow Stats Requests messages, a 'cookie' and 'cookie_mask' may be
478 * supplied. Otherwise, 'cookie_mask' should be zero.
480 * This function can cause 'b''s data to be reallocated.
482 * Returns the number of bytes appended to 'b', excluding padding.
484 * If 'cr' is a catch-all rule that matches every packet, then this function
485 * appends nothing to 'b' and returns 0. */
487 nx_put_match(struct ofpbuf *b, bool oxm, const struct cls_rule *cr,
488 ovs_be64 cookie, ovs_be64 cookie_mask)
490 const flow_wildcards_t wc = cr->wc.wildcards;
491 const struct flow *flow = &cr->flow;
492 const size_t start_len = b->size;
496 BUILD_ASSERT_DECL(FLOW_WC_SEQ == 13);
499 if (!(wc & FWW_IN_PORT)) {
500 uint16_t in_port = flow->in_port;
502 nxm_put_32(b, OXM_OF_IN_PORT, ofputil_port_to_ofp11(in_port));
504 nxm_put_16(b, NXM_OF_IN_PORT, htons(in_port));
509 nxm_put_eth_masked(b, oxm ? OXM_OF_ETH_SRC : NXM_OF_ETH_SRC,
510 flow->dl_src, cr->wc.dl_src_mask);
511 nxm_put_eth_masked(b, oxm ? OXM_OF_ETH_DST : NXM_OF_ETH_DST,
512 flow->dl_dst, cr->wc.dl_dst_mask);
513 if (!(wc & FWW_DL_TYPE)) {
514 nxm_put_16(b, oxm ? OXM_OF_ETH_TYPE : NXM_OF_ETH_TYPE,
515 ofputil_dl_type_to_openflow(flow->dl_type));
520 * XXX missing OXM support */
521 nxm_put_16m(b, NXM_OF_VLAN_TCI, flow->vlan_tci, cr->wc.vlan_tci_mask);
524 if (!(wc & FWW_DL_TYPE) && flow->dl_type == htons(ETH_TYPE_IP)) {
526 nxm_put_32m(b, oxm ? OXM_OF_IPV4_SRC : NXM_OF_IP_SRC,
527 flow->nw_src, cr->wc.nw_src_mask);
528 nxm_put_32m(b, oxm ? OXM_OF_IPV4_DST : NXM_OF_IP_DST,
529 flow->nw_dst, cr->wc.nw_dst_mask);
530 nxm_put_ip(b, cr, IPPROTO_ICMP,
531 oxm ? OXM_OF_ICMPV4_TYPE : NXM_OF_ICMP_TYPE,
532 oxm ? OXM_OF_ICMPV4_CODE : NXM_OF_ICMP_CODE, oxm);
533 } else if (!(wc & FWW_DL_TYPE) && flow->dl_type == htons(ETH_TYPE_IPV6)) {
535 nxm_put_ipv6(b, oxm ? OXM_OF_IPV6_SRC : NXM_NX_IPV6_SRC,
536 &flow->ipv6_src, &cr->wc.ipv6_src_mask);
537 nxm_put_ipv6(b, oxm ? OXM_OF_IPV6_DST : NXM_NX_IPV6_DST,
538 &flow->ipv6_dst, &cr->wc.ipv6_dst_mask);
539 nxm_put_ip(b, cr, IPPROTO_ICMPV6,
540 oxm ? OXM_OF_ICMPV6_TYPE : NXM_NX_ICMPV6_TYPE,
541 oxm ? OXM_OF_ICMPV6_CODE : NXM_NX_ICMPV6_CODE, oxm);
543 nxm_put_32m(b, oxm ? OXM_OF_IPV6_FLABEL : NXM_NX_IPV6_LABEL,
544 flow->ipv6_label, cr->wc.ipv6_label_mask);
546 if (flow->nw_proto == IPPROTO_ICMPV6
547 && (flow->tp_src == htons(ND_NEIGHBOR_SOLICIT) ||
548 flow->tp_src == htons(ND_NEIGHBOR_ADVERT))) {
549 nxm_put_ipv6(b, oxm ? OXM_OF_IPV6_ND_TARGET : NXM_NX_ND_TARGET,
550 &flow->nd_target, &cr->wc.nd_target_mask);
551 if (!(wc & FWW_ARP_SHA)
552 && flow->tp_src == htons(ND_NEIGHBOR_SOLICIT)) {
553 nxm_put_eth(b, oxm ? OXM_OF_IPV6_ND_SLL : NXM_NX_ND_SLL,
556 if (!(wc & FWW_ARP_THA)
557 && flow->tp_src == htons(ND_NEIGHBOR_ADVERT)) {
558 nxm_put_eth(b, oxm ? OXM_OF_IPV6_ND_TLL : NXM_NX_ND_TLL,
562 } else if (!(wc & FWW_DL_TYPE) && flow->dl_type == htons(ETH_TYPE_ARP)) {
564 if (!(wc & FWW_NW_PROTO)) {
565 nxm_put_16(b, oxm ? OXM_OF_ARP_OP : NXM_OF_ARP_OP,
566 htons(flow->nw_proto));
568 nxm_put_32m(b, oxm ? OXM_OF_ARP_SPA : NXM_OF_ARP_SPA,
569 flow->nw_src, cr->wc.nw_src_mask);
570 nxm_put_32m(b, oxm ? OXM_OF_ARP_TPA : NXM_OF_ARP_TPA,
571 flow->nw_dst, cr->wc.nw_dst_mask);
572 if (!(wc & FWW_ARP_SHA)) {
573 nxm_put_eth(b, oxm ? OXM_OF_ARP_SHA : NXM_NX_ARP_SHA,
576 if (!(wc & FWW_ARP_THA)) {
577 nxm_put_eth(b, oxm ? OXM_OF_ARP_THA : NXM_NX_ARP_THA,
583 nxm_put_64m(b, NXM_NX_TUN_ID, flow->tun_id, cr->wc.tun_id_mask);
586 for (i = 0; i < FLOW_N_REGS; i++) {
587 nxm_put_32m(b, NXM_NX_REG(i),
588 htonl(flow->regs[i]), htonl(cr->wc.reg_masks[i]));
591 /* OpenFlow 1.1+ Metadata. */
592 nxm_put_64m(b, OXM_OF_METADATA, flow->metadata, cr->wc.metadata_mask);
595 nxm_put_64m(b, NXM_NX_COOKIE, cookie, cookie_mask);
597 match_len = b->size - start_len;
598 ofpbuf_put_zeros(b, ROUND_UP(match_len, 8) - match_len);
602 /* nx_match_to_string() and helpers. */
604 static void format_nxm_field_name(struct ds *, uint32_t header);
607 nx_match_to_string(const uint8_t *p, unsigned int match_len)
613 return xstrdup("<any>");
617 while ((header = nx_entry_ok(p, match_len)) != 0) {
618 unsigned int length = NXM_LENGTH(header);
619 unsigned int value_len = nxm_field_bytes(header);
620 const uint8_t *value = p + 4;
621 const uint8_t *mask = value + value_len;
625 ds_put_cstr(&s, ", ");
628 format_nxm_field_name(&s, header);
629 ds_put_char(&s, '(');
631 for (i = 0; i < value_len; i++) {
632 ds_put_format(&s, "%02x", value[i]);
634 if (NXM_HASMASK(header)) {
635 ds_put_char(&s, '/');
636 for (i = 0; i < value_len; i++) {
637 ds_put_format(&s, "%02x", mask[i]);
640 ds_put_char(&s, ')');
643 match_len -= 4 + length;
648 ds_put_cstr(&s, ", ");
651 ds_put_format(&s, "<%u invalid bytes>", match_len);
654 return ds_steal_cstr(&s);
658 format_nxm_field_name(struct ds *s, uint32_t header)
660 const struct mf_field *mf = mf_from_nxm_header(header);
662 ds_put_cstr(s, IS_OXM_HEADER(header) ? mf->oxm_name : mf->nxm_name);
663 if (NXM_HASMASK(header)) {
664 ds_put_cstr(s, "_W");
666 } else if (header == NXM_NX_COOKIE) {
667 ds_put_cstr(s, "NXM_NX_COOKIE");
668 } else if (header == NXM_NX_COOKIE_W) {
669 ds_put_cstr(s, "NXM_NX_COOKIE_W");
671 ds_put_format(s, "%d:%d", NXM_VENDOR(header), NXM_FIELD(header));
676 parse_nxm_field_name(const char *name, int name_len)
681 /* Check whether it's a field name. */
682 wild = name_len > 2 && !memcmp(&name[name_len - 2], "_W", 2);
687 for (i = 0; i < MFF_N_IDS; i++) {
688 const struct mf_field *mf = mf_from_id(i);
692 !strncmp(mf->nxm_name, name, name_len) &&
693 mf->nxm_name[name_len] == '\0') {
694 header = mf->nxm_header;
695 } else if (mf->oxm_name &&
696 !strncmp(mf->oxm_name, name, name_len) &&
697 mf->oxm_name[name_len] == '\0') {
698 header = mf->oxm_header;
705 } else if (mf->maskable != MFM_NONE) {
706 return NXM_MAKE_WILD_HEADER(header);
710 if (!strncmp("NXM_NX_COOKIE", name, name_len) &&
711 (name_len == strlen("NXM_NX_COOKIE"))) {
713 return NXM_NX_COOKIE;
715 return NXM_NX_COOKIE_W;
719 /* Check whether it's a 32-bit field header value as hex.
720 * (This isn't ordinarily useful except for testing error behavior.) */
722 uint32_t header = hexits_value(name, name_len, NULL);
723 if (header != UINT_MAX) {
731 /* nx_match_from_string(). */
734 nx_match_from_string(const char *s, struct ofpbuf *b)
736 const char *full_s = s;
737 const size_t start_len = b->size;
740 if (!strcmp(s, "<any>")) {
741 /* Ensure that 'b->data' isn't actually null. */
742 ofpbuf_prealloc_tailroom(b, 1);
746 for (s += strspn(s, ", "); *s; s += strspn(s, ", ")) {
753 name_len = strcspn(s, "(");
754 if (s[name_len] != '(') {
755 ovs_fatal(0, "%s: missing ( at end of nx_match", full_s);
758 header = parse_nxm_field_name(name, name_len);
760 ovs_fatal(0, "%s: unknown field `%.*s'", full_s, name_len, s);
765 nxm_put_header(b, header);
766 s = ofpbuf_put_hex(b, s, &n);
767 if (n != nxm_field_bytes(header)) {
768 ovs_fatal(0, "%.2s: hex digits expected", s);
770 if (NXM_HASMASK(header)) {
773 ovs_fatal(0, "%s: missing / in masked field %.*s",
774 full_s, name_len, name);
776 s = ofpbuf_put_hex(b, s + 1, &n);
777 if (n != nxm_field_bytes(header)) {
778 ovs_fatal(0, "%.2s: hex digits expected", s);
784 ovs_fatal(0, "%s: missing ) following field %.*s",
785 full_s, name_len, name);
790 match_len = b->size - start_len;
791 ofpbuf_put_zeros(b, ROUND_UP(match_len, 8) - match_len);
796 nxm_parse_reg_move(struct ofpact_reg_move *move, const char *s)
798 const char *full_s = s;
800 s = mf_parse_subfield(&move->src, s);
801 if (strncmp(s, "->", 2)) {
802 ovs_fatal(0, "%s: missing `->' following source", full_s);
805 s = mf_parse_subfield(&move->dst, s);
807 ovs_fatal(0, "%s: trailing garbage following destination", full_s);
810 if (move->src.n_bits != move->dst.n_bits) {
811 ovs_fatal(0, "%s: source field is %d bits wide but destination is "
812 "%d bits wide", full_s,
813 move->src.n_bits, move->dst.n_bits);
818 nxm_parse_reg_load(struct ofpact_reg_load *load, const char *s)
820 const char *full_s = s;
822 load->value = strtoull(s, (char **) &s, 0);
823 if (strncmp(s, "->", 2)) {
824 ovs_fatal(0, "%s: missing `->' following value", full_s);
827 s = mf_parse_subfield(&load->dst, s);
829 ovs_fatal(0, "%s: trailing garbage following destination", full_s);
832 if (load->dst.n_bits < 64 && (load->value >> load->dst.n_bits) != 0) {
833 ovs_fatal(0, "%s: value %"PRIu64" does not fit into %d bits",
834 full_s, load->value, load->dst.n_bits);
838 /* nxm_format_reg_move(), nxm_format_reg_load(). */
841 nxm_format_reg_move(const struct ofpact_reg_move *move, struct ds *s)
843 ds_put_format(s, "move:");
844 mf_format_subfield(&move->src, s);
845 ds_put_cstr(s, "->");
846 mf_format_subfield(&move->dst, s);
850 nxm_format_reg_load(const struct ofpact_reg_load *load, struct ds *s)
852 ds_put_format(s, "load:%#"PRIx64"->", load->value);
853 mf_format_subfield(&load->dst, s);
857 nxm_reg_move_from_openflow(const struct nx_action_reg_move *narm,
858 struct ofpbuf *ofpacts)
860 struct ofpact_reg_move *move;
862 move = ofpact_put_REG_MOVE(ofpacts);
863 move->src.field = mf_from_nxm_header(ntohl(narm->src));
864 move->src.ofs = ntohs(narm->src_ofs);
865 move->src.n_bits = ntohs(narm->n_bits);
866 move->dst.field = mf_from_nxm_header(ntohl(narm->dst));
867 move->dst.ofs = ntohs(narm->dst_ofs);
868 move->dst.n_bits = ntohs(narm->n_bits);
870 return nxm_reg_move_check(move, NULL);
874 nxm_reg_load_from_openflow(const struct nx_action_reg_load *narl,
875 struct ofpbuf *ofpacts)
877 struct ofpact_reg_load *load;
879 load = ofpact_put_REG_LOAD(ofpacts);
880 load->dst.field = mf_from_nxm_header(ntohl(narl->dst));
881 load->dst.ofs = nxm_decode_ofs(narl->ofs_nbits);
882 load->dst.n_bits = nxm_decode_n_bits(narl->ofs_nbits);
883 load->value = ntohll(narl->value);
885 /* Reject 'narl' if a bit numbered 'n_bits' or higher is set to 1 in
887 if (load->dst.n_bits < 64 && load->value >> load->dst.n_bits) {
888 return OFPERR_OFPBAC_BAD_ARGUMENT;
891 return nxm_reg_load_check(load, NULL);
895 nxm_reg_move_check(const struct ofpact_reg_move *move, const struct flow *flow)
899 error = mf_check_src(&move->src, flow);
904 return mf_check_dst(&move->dst, NULL);
908 nxm_reg_load_check(const struct ofpact_reg_load *load, const struct flow *flow)
910 return mf_check_dst(&load->dst, flow);
914 nxm_reg_move_to_nxast(const struct ofpact_reg_move *move,
915 struct ofpbuf *openflow)
917 struct nx_action_reg_move *narm;
919 narm = ofputil_put_NXAST_REG_MOVE(openflow);
920 narm->n_bits = htons(move->dst.n_bits);
921 narm->src_ofs = htons(move->src.ofs);
922 narm->dst_ofs = htons(move->dst.ofs);
923 narm->src = htonl(move->src.field->nxm_header);
924 narm->dst = htonl(move->dst.field->nxm_header);
928 nxm_reg_load_to_nxast(const struct ofpact_reg_load *load,
929 struct ofpbuf *openflow)
931 struct nx_action_reg_load *narl;
933 narl = ofputil_put_NXAST_REG_LOAD(openflow);
934 narl->ofs_nbits = nxm_encode_ofs_nbits(load->dst.ofs, load->dst.n_bits);
935 narl->dst = htonl(load->dst.field->nxm_header);
936 narl->value = htonll(load->value);
939 /* nxm_execute_reg_move(), nxm_execute_reg_load(). */
942 nxm_execute_reg_move(const struct ofpact_reg_move *move,
945 union mf_value src_value;
946 union mf_value dst_value;
948 mf_get_value(move->dst.field, flow, &dst_value);
949 mf_get_value(move->src.field, flow, &src_value);
950 bitwise_copy(&src_value, move->src.field->n_bytes, move->src.ofs,
951 &dst_value, move->dst.field->n_bytes, move->dst.ofs,
953 mf_set_flow_value(move->dst.field, &dst_value, flow);
957 nxm_execute_reg_load(const struct ofpact_reg_load *load, struct flow *flow)
959 nxm_reg_load(&load->dst, load->value, flow);
963 nxm_reg_load(const struct mf_subfield *dst, uint64_t src_data,
966 union mf_value dst_value;
967 union mf_value src_value;
969 mf_get_value(dst->field, flow, &dst_value);
970 src_value.be64 = htonll(src_data);
971 bitwise_copy(&src_value, sizeof src_value.be64, 0,
972 &dst_value, dst->field->n_bytes, dst->ofs,
974 mf_set_flow_value(dst->field, &dst_value, flow);