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-errors.h"
29 #include "openflow/nicira-ext.h"
31 #include "unaligned.h"
35 VLOG_DEFINE_THIS_MODULE(nx_match);
37 /* Rate limit for nx_match parse errors. These always indicate a bug in the
38 * peer and so there's not much point in showing a lot of them. */
39 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
41 /* Returns the width of the data for a field with the given 'header', in
44 nxm_field_bytes(uint32_t header)
46 unsigned int length = NXM_LENGTH(header);
47 return NXM_HASMASK(header) ? length / 2 : length;
50 /* Returns the width of the data for a field with the given 'header', in
53 nxm_field_bits(uint32_t header)
55 return nxm_field_bytes(header) * 8;
58 /* nx_pull_match() and helpers. */
61 nx_entry_ok(const void *p, unsigned int match_len)
63 unsigned int payload_len;
69 VLOG_DBG_RL(&rl, "nx_match ends with partial nxm_header");
73 memcpy(&header_be, p, 4);
74 header = ntohl(header_be);
76 payload_len = NXM_LENGTH(header);
78 VLOG_DBG_RL(&rl, "nxm_entry %08"PRIx32" has invalid payload "
82 if (match_len < payload_len + 4) {
83 VLOG_DBG_RL(&rl, "%"PRIu32"-byte nxm_entry but only "
84 "%u bytes left in nx_match", payload_len + 4, match_len);
92 nx_pull_match__(struct ofpbuf *b, unsigned int match_len, bool strict,
93 uint16_t priority, struct cls_rule *rule,
94 ovs_be64 *cookie, ovs_be64 *cookie_mask)
99 assert((cookie != NULL) == (cookie_mask != NULL));
101 p = ofpbuf_try_pull(b, ROUND_UP(match_len, 8));
103 VLOG_DBG_RL(&rl, "nx_match length %u, rounded up to a "
104 "multiple of 8, is longer than space in message (max "
105 "length %zu)", match_len, b->size);
106 return OFPERR_OFPBMC_BAD_LEN;
109 cls_rule_init_catchall(rule, priority);
111 *cookie = *cookie_mask = htonll(0);
114 (header = nx_entry_ok(p, match_len)) != 0;
115 p += 4 + NXM_LENGTH(header), match_len -= 4 + NXM_LENGTH(header)) {
116 const struct mf_field *mf;
119 mf = mf_from_nxm_header(header);
122 error = OFPERR_OFPBMC_BAD_FIELD;
126 } else if (!mf_are_prereqs_ok(mf, &rule->flow)) {
127 error = OFPERR_OFPBMC_BAD_PREREQ;
128 } else if (!mf_is_all_wild(mf, &rule->wc)) {
129 error = OFPERR_OFPBMC_DUP_FIELD;
131 unsigned int width = mf->n_bytes;
132 union mf_value value;
134 memcpy(&value, p + 4, width);
135 if (!mf_is_value_valid(mf, &value)) {
136 error = OFPERR_OFPBMC_BAD_VALUE;
137 } else if (!NXM_HASMASK(header)) {
139 mf_set_value(mf, &value, rule);
143 memcpy(&mask, p + 4 + width, width);
144 if (!mf_is_mask_valid(mf, &mask)) {
145 error = OFPERR_OFPBMC_BAD_MASK;
148 mf_set(mf, &value, &mask, rule);
153 /* Check if the match is for a cookie rather than a classifier rule. */
154 if ((header == NXM_NX_COOKIE || header == NXM_NX_COOKIE_W) && cookie) {
156 error = OFPERR_OFPBMC_DUP_FIELD;
158 unsigned int width = sizeof *cookie;
160 memcpy(cookie, p + 4, width);
161 if (NXM_HASMASK(header)) {
162 memcpy(cookie_mask, p + 4 + width, width);
164 *cookie_mask = htonll(UINT64_MAX);
171 VLOG_DBG_RL(&rl, "bad nxm_entry %#08"PRIx32" (vendor=%"PRIu32", "
172 "field=%"PRIu32", hasmask=%"PRIu32", len=%"PRIu32"), "
174 NXM_VENDOR(header), NXM_FIELD(header),
175 NXM_HASMASK(header), NXM_LENGTH(header),
176 ofperr_to_string(error));
181 return match_len ? OFPERR_OFPBMC_BAD_LEN : 0;
184 /* Parses the nx_match formatted match description in 'b' with length
185 * 'match_len'. The results are stored in 'rule', which is initialized with
186 * 'priority'. If 'cookie' and 'cookie_mask' contain valid pointers, then the
187 * cookie and mask will be stored in them if a "NXM_NX_COOKIE*" match is
188 * defined. Otherwise, 0 is stored in both.
190 * Fails with an error when encountering unknown NXM headers.
192 * Returns 0 if successful, otherwise an OpenFlow error code. */
194 nx_pull_match(struct ofpbuf *b, unsigned int match_len,
195 uint16_t priority, struct cls_rule *rule,
196 ovs_be64 *cookie, ovs_be64 *cookie_mask)
198 return nx_pull_match__(b, match_len, true, priority, rule, cookie,
202 /* Behaves the same as nx_pull_match() with one exception. Skips over unknown
203 * NXM headers instead of failing with an error when they are encountered. */
205 nx_pull_match_loose(struct ofpbuf *b, unsigned int match_len,
206 uint16_t priority, struct cls_rule *rule,
207 ovs_be64 *cookie, ovs_be64 *cookie_mask)
209 return nx_pull_match__(b, match_len, false, priority, rule, cookie,
213 /* nx_put_match() and helpers.
215 * 'put' functions whose names end in 'w' add a wildcarded field.
216 * 'put' functions whose names end in 'm' add a field that might be wildcarded.
217 * Other 'put' functions add exact-match fields.
221 nxm_put_header(struct ofpbuf *b, uint32_t header)
223 ovs_be32 n_header = htonl(header);
224 ofpbuf_put(b, &n_header, sizeof n_header);
228 nxm_put_8(struct ofpbuf *b, uint32_t header, uint8_t value)
230 nxm_put_header(b, header);
231 ofpbuf_put(b, &value, sizeof value);
235 nxm_put_8m(struct ofpbuf *b, uint32_t header, uint8_t value, uint8_t mask)
242 nxm_put_8(b, header, value);
246 nxm_put_header(b, NXM_MAKE_WILD_HEADER(header));
247 ofpbuf_put(b, &value, sizeof value);
248 ofpbuf_put(b, &mask, sizeof mask);
253 nxm_put_16(struct ofpbuf *b, uint32_t header, ovs_be16 value)
255 nxm_put_header(b, header);
256 ofpbuf_put(b, &value, sizeof value);
260 nxm_put_16w(struct ofpbuf *b, uint32_t header, ovs_be16 value, ovs_be16 mask)
262 nxm_put_header(b, header);
263 ofpbuf_put(b, &value, sizeof value);
264 ofpbuf_put(b, &mask, sizeof mask);
268 nxm_put_16m(struct ofpbuf *b, uint32_t header, ovs_be16 value, ovs_be16 mask)
274 case CONSTANT_HTONS(UINT16_MAX):
275 nxm_put_16(b, header, value);
279 nxm_put_16w(b, NXM_MAKE_WILD_HEADER(header), value, mask);
285 nxm_put_32(struct ofpbuf *b, uint32_t header, ovs_be32 value)
287 nxm_put_header(b, header);
288 ofpbuf_put(b, &value, sizeof value);
292 nxm_put_32w(struct ofpbuf *b, uint32_t header, ovs_be32 value, ovs_be32 mask)
294 nxm_put_header(b, header);
295 ofpbuf_put(b, &value, sizeof value);
296 ofpbuf_put(b, &mask, sizeof mask);
300 nxm_put_32m(struct ofpbuf *b, uint32_t header, ovs_be32 value, ovs_be32 mask)
306 case CONSTANT_HTONL(UINT32_MAX):
307 nxm_put_32(b, header, value);
311 nxm_put_32w(b, NXM_MAKE_WILD_HEADER(header), value, mask);
317 nxm_put_64(struct ofpbuf *b, uint32_t header, ovs_be64 value)
319 nxm_put_header(b, header);
320 ofpbuf_put(b, &value, sizeof value);
324 nxm_put_64w(struct ofpbuf *b, uint32_t header, ovs_be64 value, ovs_be64 mask)
326 nxm_put_header(b, header);
327 ofpbuf_put(b, &value, sizeof value);
328 ofpbuf_put(b, &mask, sizeof mask);
332 nxm_put_64m(struct ofpbuf *b, uint32_t header, ovs_be64 value, ovs_be64 mask)
338 case CONSTANT_HTONLL(UINT64_MAX):
339 nxm_put_64(b, header, value);
343 nxm_put_64w(b, NXM_MAKE_WILD_HEADER(header), value, mask);
349 nxm_put_eth(struct ofpbuf *b, uint32_t header,
350 const uint8_t value[ETH_ADDR_LEN])
352 nxm_put_header(b, header);
353 ofpbuf_put(b, value, ETH_ADDR_LEN);
357 nxm_put_eth_masked(struct ofpbuf *b, uint32_t header,
358 const uint8_t value[ETH_ADDR_LEN],
359 const uint8_t mask[ETH_ADDR_LEN])
361 if (!eth_addr_is_zero(mask)) {
362 if (eth_mask_is_exact(mask)) {
363 nxm_put_eth(b, header, value);
365 nxm_put_header(b, NXM_MAKE_WILD_HEADER(header));
366 ofpbuf_put(b, value, ETH_ADDR_LEN);
367 ofpbuf_put(b, mask, ETH_ADDR_LEN);
373 nxm_put_ipv6(struct ofpbuf *b, uint32_t header,
374 const struct in6_addr *value, const struct in6_addr *mask)
376 if (ipv6_mask_is_any(mask)) {
378 } else if (ipv6_mask_is_exact(mask)) {
379 nxm_put_header(b, header);
380 ofpbuf_put(b, value, sizeof *value);
382 nxm_put_header(b, NXM_MAKE_WILD_HEADER(header));
383 ofpbuf_put(b, value, sizeof *value);
384 ofpbuf_put(b, mask, sizeof *mask);
389 nxm_put_frag(struct ofpbuf *b, const struct cls_rule *cr)
391 uint8_t nw_frag = cr->flow.nw_frag;
392 uint8_t nw_frag_mask = cr->wc.nw_frag_mask;
394 switch (nw_frag_mask) {
398 case FLOW_NW_FRAG_MASK:
399 nxm_put_8(b, NXM_NX_IP_FRAG, nw_frag);
403 nxm_put_8m(b, NXM_NX_IP_FRAG, nw_frag,
404 nw_frag_mask & FLOW_NW_FRAG_MASK);
410 nxm_put_ip(struct ofpbuf *b, const struct cls_rule *cr,
411 uint8_t icmp_proto, uint32_t icmp_type, uint32_t icmp_code)
413 const flow_wildcards_t wc = cr->wc.wildcards;
414 const struct flow *flow = &cr->flow;
418 if (!(wc & FWW_NW_DSCP)) {
419 nxm_put_8(b, NXM_OF_IP_TOS, flow->nw_tos & IP_DSCP_MASK);
422 if (!(wc & FWW_NW_ECN)) {
423 nxm_put_8(b, NXM_NX_IP_ECN, flow->nw_tos & IP_ECN_MASK);
426 if (!(wc & FWW_NW_TTL)) {
427 nxm_put_8(b, NXM_NX_IP_TTL, flow->nw_ttl);
430 if (!(wc & FWW_NW_PROTO)) {
431 nxm_put_8(b, NXM_OF_IP_PROTO, flow->nw_proto);
433 if (flow->nw_proto == IPPROTO_TCP) {
434 nxm_put_16m(b, NXM_OF_TCP_SRC, flow->tp_src, cr->wc.tp_src_mask);
435 nxm_put_16m(b, NXM_OF_TCP_DST, flow->tp_dst, cr->wc.tp_dst_mask);
436 } else if (flow->nw_proto == IPPROTO_UDP) {
437 nxm_put_16m(b, NXM_OF_UDP_SRC, flow->tp_src, cr->wc.tp_src_mask);
438 nxm_put_16m(b, NXM_OF_UDP_DST, flow->tp_dst, cr->wc.tp_dst_mask);
439 } else if (flow->nw_proto == icmp_proto) {
440 if (cr->wc.tp_src_mask) {
441 nxm_put_8(b, icmp_type, ntohs(flow->tp_src));
443 if (cr->wc.tp_dst_mask) {
444 nxm_put_8(b, icmp_code, ntohs(flow->tp_dst));
450 /* Appends to 'b' the nx_match format that expresses 'cr' (except for
451 * 'cr->priority', because priority is not part of nx_match), plus enough
452 * zero bytes to pad the nx_match out to a multiple of 8. For Flow Mod
453 * and Flow Stats Requests messages, a 'cookie' and 'cookie_mask' may be
454 * supplied. Otherwise, 'cookie_mask' should be zero.
456 * This function can cause 'b''s data to be reallocated.
458 * Returns the number of bytes appended to 'b', excluding padding.
460 * If 'cr' is a catch-all rule that matches every packet, then this function
461 * appends nothing to 'b' and returns 0. */
463 nx_put_match(struct ofpbuf *b, const struct cls_rule *cr,
464 ovs_be64 cookie, ovs_be64 cookie_mask)
466 const flow_wildcards_t wc = cr->wc.wildcards;
467 const struct flow *flow = &cr->flow;
468 const size_t start_len = b->size;
472 BUILD_ASSERT_DECL(FLOW_WC_SEQ == 11);
475 if (!(wc & FWW_IN_PORT)) {
476 uint16_t in_port = flow->in_port;
477 nxm_put_16(b, NXM_OF_IN_PORT, htons(in_port));
481 nxm_put_eth_masked(b, NXM_OF_ETH_SRC, flow->dl_src, cr->wc.dl_src_mask);
482 nxm_put_eth_masked(b, NXM_OF_ETH_DST, flow->dl_dst, cr->wc.dl_dst_mask);
483 if (!(wc & FWW_DL_TYPE)) {
484 nxm_put_16(b, NXM_OF_ETH_TYPE,
485 ofputil_dl_type_to_openflow(flow->dl_type));
489 nxm_put_16m(b, NXM_OF_VLAN_TCI, flow->vlan_tci, cr->wc.vlan_tci_mask);
492 if (!(wc & FWW_DL_TYPE) && flow->dl_type == htons(ETH_TYPE_IP)) {
494 nxm_put_32m(b, NXM_OF_IP_SRC, flow->nw_src, cr->wc.nw_src_mask);
495 nxm_put_32m(b, NXM_OF_IP_DST, flow->nw_dst, cr->wc.nw_dst_mask);
496 nxm_put_ip(b, cr, IPPROTO_ICMP, NXM_OF_ICMP_TYPE, NXM_OF_ICMP_CODE);
497 } else if (!(wc & FWW_DL_TYPE) && flow->dl_type == htons(ETH_TYPE_IPV6)) {
499 nxm_put_ipv6(b, NXM_NX_IPV6_SRC, &flow->ipv6_src,
500 &cr->wc.ipv6_src_mask);
501 nxm_put_ipv6(b, NXM_NX_IPV6_DST, &flow->ipv6_dst,
502 &cr->wc.ipv6_dst_mask);
504 IPPROTO_ICMPV6, NXM_NX_ICMPV6_TYPE, NXM_NX_ICMPV6_CODE);
506 if (!(wc & FWW_IPV6_LABEL)) {
507 nxm_put_32(b, NXM_NX_IPV6_LABEL, flow->ipv6_label);
510 if (flow->nw_proto == IPPROTO_ICMPV6
511 && (flow->tp_src == htons(ND_NEIGHBOR_SOLICIT) ||
512 flow->tp_src == htons(ND_NEIGHBOR_ADVERT))) {
513 nxm_put_ipv6(b, NXM_NX_ND_TARGET, &flow->nd_target,
514 &cr->wc.nd_target_mask);
515 if (!(wc & FWW_ARP_SHA)
516 && flow->tp_src == htons(ND_NEIGHBOR_SOLICIT)) {
517 nxm_put_eth(b, NXM_NX_ND_SLL, flow->arp_sha);
519 if (!(wc & FWW_ARP_THA)
520 && flow->tp_src == htons(ND_NEIGHBOR_ADVERT)) {
521 nxm_put_eth(b, NXM_NX_ND_TLL, flow->arp_tha);
524 } else if (!(wc & FWW_DL_TYPE) && flow->dl_type == htons(ETH_TYPE_ARP)) {
526 if (!(wc & FWW_NW_PROTO)) {
527 nxm_put_16(b, NXM_OF_ARP_OP, htons(flow->nw_proto));
529 nxm_put_32m(b, NXM_OF_ARP_SPA, flow->nw_src, cr->wc.nw_src_mask);
530 nxm_put_32m(b, NXM_OF_ARP_TPA, flow->nw_dst, cr->wc.nw_dst_mask);
531 if (!(wc & FWW_ARP_SHA)) {
532 nxm_put_eth(b, NXM_NX_ARP_SHA, flow->arp_sha);
534 if (!(wc & FWW_ARP_THA)) {
535 nxm_put_eth(b, NXM_NX_ARP_THA, flow->arp_tha);
540 nxm_put_64m(b, NXM_NX_TUN_ID, flow->tun_id, cr->wc.tun_id_mask);
543 for (i = 0; i < FLOW_N_REGS; i++) {
544 nxm_put_32m(b, NXM_NX_REG(i),
545 htonl(flow->regs[i]), htonl(cr->wc.reg_masks[i]));
549 nxm_put_64m(b, NXM_NX_COOKIE, cookie, cookie_mask);
551 match_len = b->size - start_len;
552 ofpbuf_put_zeros(b, ROUND_UP(match_len, 8) - match_len);
556 /* nx_match_to_string() and helpers. */
558 static void format_nxm_field_name(struct ds *, uint32_t header);
561 nx_match_to_string(const uint8_t *p, unsigned int match_len)
567 return xstrdup("<any>");
571 while ((header = nx_entry_ok(p, match_len)) != 0) {
572 unsigned int length = NXM_LENGTH(header);
573 unsigned int value_len = nxm_field_bytes(header);
574 const uint8_t *value = p + 4;
575 const uint8_t *mask = value + value_len;
579 ds_put_cstr(&s, ", ");
582 format_nxm_field_name(&s, header);
583 ds_put_char(&s, '(');
585 for (i = 0; i < value_len; i++) {
586 ds_put_format(&s, "%02x", value[i]);
588 if (NXM_HASMASK(header)) {
589 ds_put_char(&s, '/');
590 for (i = 0; i < value_len; i++) {
591 ds_put_format(&s, "%02x", mask[i]);
594 ds_put_char(&s, ')');
597 match_len -= 4 + length;
602 ds_put_cstr(&s, ", ");
605 ds_put_format(&s, "<%u invalid bytes>", match_len);
608 return ds_steal_cstr(&s);
612 format_nxm_field_name(struct ds *s, uint32_t header)
614 const struct mf_field *mf = mf_from_nxm_header(header);
616 ds_put_cstr(s, mf->nxm_name);
617 if (NXM_HASMASK(header)) {
618 ds_put_cstr(s, "_W");
620 } else if (header == NXM_NX_COOKIE) {
621 ds_put_cstr(s, "NXM_NX_COOKIE");
622 } else if (header == NXM_NX_COOKIE_W) {
623 ds_put_cstr(s, "NXM_NX_COOKIE_W");
625 ds_put_format(s, "%d:%d", NXM_VENDOR(header), NXM_FIELD(header));
630 parse_nxm_field_name(const char *name, int name_len)
635 /* Check whether it's a field name. */
636 wild = name_len > 2 && !memcmp(&name[name_len - 2], "_W", 2);
641 for (i = 0; i < MFF_N_IDS; i++) {
642 const struct mf_field *mf = mf_from_id(i);
645 && !strncmp(mf->nxm_name, name, name_len)
646 && mf->nxm_name[name_len] == '\0') {
648 return mf->nxm_header;
649 } else if (mf->maskable != MFM_NONE) {
650 return NXM_MAKE_WILD_HEADER(mf->nxm_header);
655 if (!strncmp("NXM_NX_COOKIE", name, name_len)
656 && (name_len == strlen("NXM_NX_COOKIE"))) {
658 return NXM_NX_COOKIE;
660 return NXM_NX_COOKIE_W;
664 /* Check whether it's a 32-bit field header value as hex.
665 * (This isn't ordinarily useful except for testing error behavior.) */
667 uint32_t header = hexits_value(name, name_len, NULL);
668 if (header != UINT_MAX) {
676 /* nx_match_from_string(). */
679 nx_match_from_string(const char *s, struct ofpbuf *b)
681 const char *full_s = s;
682 const size_t start_len = b->size;
685 if (!strcmp(s, "<any>")) {
686 /* Ensure that 'b->data' isn't actually null. */
687 ofpbuf_prealloc_tailroom(b, 1);
691 for (s += strspn(s, ", "); *s; s += strspn(s, ", ")) {
698 name_len = strcspn(s, "(");
699 if (s[name_len] != '(') {
700 ovs_fatal(0, "%s: missing ( at end of nx_match", full_s);
703 header = parse_nxm_field_name(name, name_len);
705 ovs_fatal(0, "%s: unknown field `%.*s'", full_s, name_len, s);
710 nxm_put_header(b, header);
711 s = ofpbuf_put_hex(b, s, &n);
712 if (n != nxm_field_bytes(header)) {
713 ovs_fatal(0, "%.2s: hex digits expected", s);
715 if (NXM_HASMASK(header)) {
718 ovs_fatal(0, "%s: missing / in masked field %.*s",
719 full_s, name_len, name);
721 s = ofpbuf_put_hex(b, s + 1, &n);
722 if (n != nxm_field_bytes(header)) {
723 ovs_fatal(0, "%.2s: hex digits expected", s);
729 ovs_fatal(0, "%s: missing ) following field %.*s",
730 full_s, name_len, name);
735 match_len = b->size - start_len;
736 ofpbuf_put_zeros(b, ROUND_UP(match_len, 8) - match_len);
741 nxm_parse_reg_move(struct nx_action_reg_move *move, const char *s)
743 const char *full_s = s;
744 struct mf_subfield src, dst;
746 s = mf_parse_subfield(&src, s);
747 if (strncmp(s, "->", 2)) {
748 ovs_fatal(0, "%s: missing `->' following source", full_s);
751 s = mf_parse_subfield(&dst, s);
753 ovs_fatal(0, "%s: trailing garbage following destination", full_s);
756 if (src.n_bits != dst.n_bits) {
757 ovs_fatal(0, "%s: source field is %d bits wide but destination is "
758 "%d bits wide", full_s, src.n_bits, dst.n_bits);
761 ofputil_init_NXAST_REG_MOVE(move);
762 move->n_bits = htons(src.n_bits);
763 move->src_ofs = htons(src.ofs);
764 move->dst_ofs = htons(dst.ofs);
765 move->src = htonl(src.field->nxm_header);
766 move->dst = htonl(dst.field->nxm_header);
770 nxm_parse_reg_load(struct nx_action_reg_load *load, const char *s)
772 const char *full_s = s;
773 struct mf_subfield dst;
776 value = strtoull(s, (char **) &s, 0);
777 if (strncmp(s, "->", 2)) {
778 ovs_fatal(0, "%s: missing `->' following value", full_s);
781 s = mf_parse_subfield(&dst, s);
783 ovs_fatal(0, "%s: trailing garbage following destination", full_s);
786 if (dst.n_bits < 64 && (value >> dst.n_bits) != 0) {
787 ovs_fatal(0, "%s: value %"PRIu64" does not fit into %u bits",
788 full_s, value, dst.n_bits);
791 ofputil_init_NXAST_REG_LOAD(load);
792 load->ofs_nbits = nxm_encode_ofs_nbits(dst.ofs, dst.n_bits);
793 load->dst = htonl(dst.field->nxm_header);
794 load->value = htonll(value);
797 /* nxm_format_reg_move(), nxm_format_reg_load(). */
800 nxm_format_reg_move(const struct nx_action_reg_move *move, struct ds *s)
802 struct mf_subfield src, dst;
804 nxm_decode_discrete(&src, move->src, move->src_ofs, move->n_bits);
805 nxm_decode_discrete(&dst, move->dst, move->dst_ofs, move->n_bits);
807 ds_put_format(s, "move:");
808 mf_format_subfield(&src, s);
809 ds_put_cstr(s, "->");
810 mf_format_subfield(&dst, s);
814 nxm_format_reg_load(const struct nx_action_reg_load *load, struct ds *s)
816 struct mf_subfield dst;
818 ds_put_format(s, "load:%#"PRIx64"->", ntohll(load->value));
820 nxm_decode(&dst, load->dst, load->ofs_nbits);
821 mf_format_subfield(&dst, s);
824 /* nxm_check_reg_move(), nxm_check_reg_load(). */
827 nxm_check_reg_move(const struct nx_action_reg_move *action,
828 const struct flow *flow)
830 struct mf_subfield src;
831 struct mf_subfield dst;
834 nxm_decode_discrete(&src, action->src, action->src_ofs, action->n_bits);
835 error = mf_check_src(&src, flow);
840 nxm_decode_discrete(&dst, action->dst, action->dst_ofs, action->n_bits);
841 return mf_check_dst(&dst, flow);
845 nxm_check_reg_load(const struct nx_action_reg_load *action,
846 const struct flow *flow)
848 struct mf_subfield dst;
851 nxm_decode(&dst, action->dst, action->ofs_nbits);
852 error = mf_check_dst(&dst, flow);
857 /* Reject 'action' if a bit numbered 'n_bits' or higher is set to 1 in
859 if (dst.n_bits < 64 && ntohll(action->value) >> dst.n_bits) {
860 return OFPERR_OFPBAC_BAD_ARGUMENT;
866 /* nxm_execute_reg_move(), nxm_execute_reg_load(). */
869 nxm_execute_reg_move(const struct nx_action_reg_move *action,
872 struct mf_subfield src, dst;
873 union mf_value src_value;
874 union mf_value dst_value;
876 nxm_decode_discrete(&src, action->src, action->src_ofs, action->n_bits);
877 nxm_decode_discrete(&dst, action->dst, action->dst_ofs, action->n_bits);
879 mf_get_value(dst.field, flow, &dst_value);
880 mf_get_value(src.field, flow, &src_value);
881 bitwise_copy(&src_value, src.field->n_bytes, src.ofs,
882 &dst_value, dst.field->n_bytes, dst.ofs,
884 mf_set_flow_value(dst.field, &dst_value, flow);
888 nxm_execute_reg_load(const struct nx_action_reg_load *action,
891 struct mf_subfield dst;
893 nxm_decode(&dst, action->dst, action->ofs_nbits);
894 mf_set_subfield_value(&dst, ntohll(action->value), flow);
897 /* Initializes 'sf->field' with the field corresponding to the given NXM
898 * 'header' and 'sf->ofs' and 'sf->n_bits' decoded from 'ofs_nbits' with
899 * nxm_decode_ofs() and nxm_decode_n_bits(), respectively.
901 * Afterward, 'sf' might be invalid in a few different ways:
903 * - 'sf->field' will be NULL if 'header' is unknown.
905 * - 'sf->ofs' and 'sf->n_bits' might exceed the width of sf->field.
907 * The caller should call mf_check_src() or mf_check_dst() to check for these
910 nxm_decode(struct mf_subfield *sf, ovs_be32 header, ovs_be16 ofs_nbits)
912 sf->field = mf_from_nxm_header(ntohl(header));
913 sf->ofs = nxm_decode_ofs(ofs_nbits);
914 sf->n_bits = nxm_decode_n_bits(ofs_nbits);
917 /* Initializes 'sf->field' with the field corresponding to the given NXM
918 * 'header' and 'sf->ofs' and 'sf->n_bits' from 'ofs' and 'n_bits',
921 * Afterward, 'sf' might be invalid in a few different ways:
923 * - 'sf->field' will be NULL if 'header' is unknown.
925 * - 'sf->ofs' and 'sf->n_bits' might exceed the width of sf->field.
927 * The caller should call mf_check_src() or mf_check_dst() to check for these
930 nxm_decode_discrete(struct mf_subfield *sf, ovs_be32 header,
931 ovs_be16 ofs, ovs_be16 n_bits)
933 sf->field = mf_from_nxm_header(ntohl(header));
934 sf->ofs = ntohs(ofs);
935 sf->n_bits = ntohs(n_bits);