2 * Copyright (c) 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 "meta-flow.h"
24 #include <netinet/icmp6.h>
25 #include <netinet/ip6.h>
27 #include "classifier.h"
28 #include "dynamic-string.h"
29 #include "ofp-errors.h"
34 #include "socket-util.h"
35 #include "unaligned.h"
38 VLOG_DEFINE_THIS_MODULE(meta_flow);
40 #define MF_FIELD_SIZES(MEMBER) \
41 sizeof ((union mf_value *)0)->MEMBER, \
42 8 * sizeof ((union mf_value *)0)->MEMBER
44 static const struct mf_field mf_fields[MFF_N_IDS] = {
50 MFF_TUN_ID, "tun_id", NULL,
56 NXM_NX_TUN_ID, "NXM_NX_TUN_ID",
57 NXM_NX_TUN_ID, "NXM_NX_TUN_ID",
59 MFF_METADATA, "metadata", NULL,
65 OXM_OF_METADATA, "OXM_OF_METADATA",
66 OXM_OF_METADATA, "OXM_OF_METADATA",
68 MFF_IN_PORT, "in_port", NULL,
70 MFM_NONE, FWW_IN_PORT,
74 NXM_OF_IN_PORT, "NXM_OF_IN_PORT",
75 OXM_OF_IN_PORT, "OXM_OF_IN_PORT",
78 #define REGISTER(IDX) \
80 MFF_REG##IDX, "reg" #IDX, NULL, \
81 MF_FIELD_SIZES(be32), \
86 NXM_NX_REG(IDX), "NXM_NX_REG" #IDX, \
87 NXM_NX_REG(IDX), "NXM_NX_REG" #IDX, \
122 MFF_ETH_SRC, "eth_src", "dl_src",
128 NXM_OF_ETH_SRC, "NXM_OF_ETH_SRC",
129 OXM_OF_ETH_SRC, "OXM_OF_ETH_SRC",
131 MFF_ETH_DST, "eth_dst", "dl_dst",
137 NXM_OF_ETH_DST, "NXM_OF_ETH_DST",
138 OXM_OF_ETH_DST, "OXM_OF_ETH_DST",
140 MFF_ETH_TYPE, "eth_type", "dl_type",
141 MF_FIELD_SIZES(be16),
142 MFM_NONE, FWW_DL_TYPE,
146 NXM_OF_ETH_TYPE, "NXM_OF_ETH_TYPE",
147 OXM_OF_ETH_TYPE, "OXM_OF_ETH_TYPE",
151 MFF_VLAN_TCI, "vlan_tci", NULL,
152 MF_FIELD_SIZES(be16),
157 NXM_OF_VLAN_TCI, "NXM_OF_VLAN_TCI",
158 NXM_OF_VLAN_TCI, "NXM_OF_VLAN_TCI",
160 MFF_DL_VLAN, "dl_vlan", NULL,
161 sizeof(ovs_be16), 12,
169 MFF_VLAN_VID, "vlan_vid", NULL,
170 sizeof(ovs_be16), 12,
175 OXM_OF_VLAN_VID, "OXM_OF_VLAN_VID",
176 OXM_OF_VLAN_VID, "OXM_OF_VLAN_VID",
178 MFF_DL_VLAN_PCP, "dl_vlan_pcp", NULL,
187 MFF_VLAN_PCP, "vlan_pcp", NULL,
193 OXM_OF_VLAN_PCP, "OXM_OF_VLAN_PCP",
194 OXM_OF_VLAN_PCP, "OXM_OF_VLAN_PCP",
202 MFF_IPV4_SRC, "ip_src", "nw_src",
203 MF_FIELD_SIZES(be32),
208 NXM_OF_IP_SRC, "NXM_OF_IP_SRC",
209 OXM_OF_IPV4_SRC, "OXM_OF_IPV4_SRC",
211 MFF_IPV4_DST, "ip_dst", "nw_dst",
212 MF_FIELD_SIZES(be32),
217 NXM_OF_IP_DST, "NXM_OF_IP_DST",
218 OXM_OF_IPV4_DST, "OXM_OF_IPV4_DST",
222 MFF_IPV6_SRC, "ipv6_src", NULL,
223 MF_FIELD_SIZES(ipv6),
228 NXM_NX_IPV6_SRC, "NXM_NX_IPV6_SRC",
229 OXM_OF_IPV6_SRC, "OXM_OF_IPV6_SRC",
231 MFF_IPV6_DST, "ipv6_dst", NULL,
232 MF_FIELD_SIZES(ipv6),
237 NXM_NX_IPV6_DST, "NXM_NX_IPV6_DST",
238 OXM_OF_IPV6_DST, "OXM_OF_IPV6_DST",
241 MFF_IPV6_LABEL, "ipv6_label", NULL,
247 NXM_NX_IPV6_LABEL, "NXM_NX_IPV6_LABEL",
248 OXM_OF_IPV6_FLABEL, "OXM_OF_IPV6_FLABEL",
252 MFF_IP_PROTO, "nw_proto", NULL,
258 NXM_OF_IP_PROTO, "NXM_OF_IP_PROTO",
259 OXM_OF_IP_PROTO, "OXM_OF_IP_PROTO",
261 MFF_IP_DSCP, "nw_tos", NULL,
267 NXM_OF_IP_TOS, "NXM_OF_IP_TOS",
268 OXM_OF_IP_DSCP, "OXM_OF_IP_DSCP",
270 MFF_IP_ECN, "nw_ecn", NULL,
276 NXM_NX_IP_ECN, "NXM_NX_IP_ECN",
277 OXM_OF_IP_ECN, "OXM_OF_IP_ECN",
279 MFF_IP_TTL, "nw_ttl", NULL,
285 NXM_NX_IP_TTL, "NXM_NX_IP_TTL",
286 NXM_NX_IP_TTL, "NXM_NX_IP_TTL",
288 MFF_IP_FRAG, "ip_frag", NULL,
294 NXM_NX_IP_FRAG, "NXM_NX_IP_FRAG",
295 NXM_NX_IP_FRAG, "NXM_NX_IP_FRAG",
299 MFF_ARP_OP, "arp_op", NULL,
300 MF_FIELD_SIZES(be16),
305 NXM_OF_ARP_OP, "NXM_OF_ARP_OP",
306 OXM_OF_ARP_OP, "OXM_OF_ARP_OP",
308 MFF_ARP_SPA, "arp_spa", NULL,
309 MF_FIELD_SIZES(be32),
314 NXM_OF_ARP_SPA, "NXM_OF_ARP_SPA",
315 OXM_OF_ARP_SPA, "OXM_OF_ARP_SPA",
317 MFF_ARP_TPA, "arp_tpa", NULL,
318 MF_FIELD_SIZES(be32),
323 NXM_OF_ARP_TPA, "NXM_OF_ARP_TPA",
324 OXM_OF_ARP_TPA, "OXM_OF_ARP_TPA",
326 MFF_ARP_SHA, "arp_sha", NULL,
332 NXM_NX_ARP_SHA, "NXM_NX_ARP_SHA",
333 OXM_OF_ARP_SHA, "OXM_OF_ARP_SHA",
335 MFF_ARP_THA, "arp_tha", NULL,
341 NXM_NX_ARP_THA, "NXM_NX_ARP_THA",
342 OXM_OF_ARP_THA, "OXM_OF_ARP_THA",
350 MFF_TCP_SRC, "tcp_src", "tp_src",
351 MF_FIELD_SIZES(be16),
356 NXM_OF_TCP_SRC, "NXM_OF_TCP_SRC",
357 OXM_OF_TCP_SRC, "OXM_OF_TCP_SRC",
359 MFF_TCP_DST, "tcp_dst", "tp_dst",
360 MF_FIELD_SIZES(be16),
365 NXM_OF_TCP_DST, "NXM_OF_TCP_DST",
366 OXM_OF_TCP_DST, "OXM_OF_TCP_DST",
370 MFF_UDP_SRC, "udp_src", NULL,
371 MF_FIELD_SIZES(be16),
376 NXM_OF_UDP_SRC, "NXM_OF_UDP_SRC",
377 OXM_OF_UDP_SRC, "OXM_OF_UDP_SRC",
379 MFF_UDP_DST, "udp_dst", NULL,
380 MF_FIELD_SIZES(be16),
385 NXM_OF_UDP_DST, "NXM_OF_UDP_DST",
386 OXM_OF_UDP_DST, "OXM_OF_UDP_DST",
390 MFF_ICMPV4_TYPE, "icmp_type", NULL,
396 NXM_OF_ICMP_TYPE, "NXM_OF_ICMP_TYPE",
397 OXM_OF_ICMPV4_TYPE, "OXM_OF_ICMPV4_TYPE",
399 MFF_ICMPV4_CODE, "icmp_code", NULL,
405 NXM_OF_ICMP_CODE, "NXM_OF_ICMP_CODE",
406 OXM_OF_ICMPV4_CODE, "OXM_OF_ICMPV4_CODE",
410 MFF_ICMPV6_TYPE, "icmpv6_type", NULL,
416 NXM_NX_ICMPV6_TYPE, "NXM_NX_ICMPV6_TYPE",
417 OXM_OF_ICMPV6_TYPE, "OXM_OF_ICMPV6_TYPE",
419 MFF_ICMPV6_CODE, "icmpv6_code", NULL,
425 NXM_NX_ICMPV6_CODE, "NXM_NX_ICMPV6_CODE",
426 OXM_OF_ICMPV6_CODE, "OXM_OF_ICMPV6_CODE",
434 MFF_ND_TARGET, "nd_target", NULL,
435 MF_FIELD_SIZES(ipv6),
440 NXM_NX_ND_TARGET, "NXM_NX_ND_TARGET",
441 OXM_OF_IPV6_ND_TARGET, "OXM_OF_IPV6_ND_TARGET",
443 MFF_ND_SLL, "nd_sll", NULL,
449 NXM_NX_ND_SLL, "NXM_NX_ND_SLL",
450 OXM_OF_IPV6_ND_SLL, "OXM_OF_IPV6_ND_SLL",
452 MFF_ND_TLL, "nd_tll", NULL,
458 NXM_NX_ND_TLL, "NXM_NX_ND_TLL",
459 OXM_OF_IPV6_ND_TLL, "OXM_OF_IPV6_ND_TLL",
463 /* Maps an NXM or OXM header value to an mf_field. */
465 struct hmap_node hmap_node; /* In 'all_fields' hmap. */
466 uint32_t header; /* NXM or OXM header value. */
467 const struct mf_field *mf;
470 /* Contains 'struct nxm_field's. */
471 static struct hmap all_fields = HMAP_INITIALIZER(&all_fields);
473 /* Rate limit for parse errors. These always indicate a bug in an OpenFlow
474 * controller and so there's not much point in showing a lot of them. */
475 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
477 const struct mf_field *mf_from_nxm_header__(uint32_t header);
479 /* Returns the field with the given 'id'. */
480 const struct mf_field *
481 mf_from_id(enum mf_field_id id)
483 assert((unsigned int) id < MFF_N_IDS);
484 return &mf_fields[id];
487 /* Returns the field with the given 'name', or a null pointer if no field has
489 const struct mf_field *
490 mf_from_name(const char *name)
492 static struct shash mf_by_name = SHASH_INITIALIZER(&mf_by_name);
494 if (shash_is_empty(&mf_by_name)) {
495 const struct mf_field *mf;
497 for (mf = mf_fields; mf < &mf_fields[MFF_N_IDS]; mf++) {
498 shash_add_once(&mf_by_name, mf->name, mf);
499 if (mf->extra_name) {
500 shash_add_once(&mf_by_name, mf->extra_name, mf);
505 return shash_find_data(&mf_by_name, name);
509 add_nxm_field(uint32_t header, const struct mf_field *mf)
513 f = xmalloc(sizeof *f);
514 hmap_insert(&all_fields, &f->hmap_node, hash_int(header, 0));
520 nxm_init_add_field(const struct mf_field *mf, uint32_t header)
523 assert(!mf_from_nxm_header__(header));
524 add_nxm_field(header, mf);
525 if (mf->maskable != MFM_NONE) {
526 add_nxm_field(NXM_MAKE_WILD_HEADER(header), mf);
534 const struct mf_field *mf;
536 for (mf = mf_fields; mf < &mf_fields[MFF_N_IDS]; mf++) {
537 nxm_init_add_field(mf, mf->nxm_header);
538 if (mf->oxm_header != mf->nxm_header) {
539 nxm_init_add_field(mf, mf->oxm_header);
544 const struct mf_field *
545 mf_from_nxm_header(uint32_t header)
547 if (hmap_is_empty(&all_fields)) {
550 return mf_from_nxm_header__(header);
553 const struct mf_field *
554 mf_from_nxm_header__(uint32_t header)
556 const struct nxm_field *f;
558 HMAP_FOR_EACH_IN_BUCKET (f, hmap_node, hash_int(header, 0), &all_fields) {
559 if (f->header == header) {
567 /* Returns true if 'wc' wildcards all the bits in field 'mf', false if 'wc'
568 * specifies at least one bit in the field.
570 * The caller is responsible for ensuring that 'wc' corresponds to a flow that
571 * meets 'mf''s prerequisites. */
573 mf_is_all_wild(const struct mf_field *mf, const struct flow_wildcards *wc)
578 assert(mf->fww_bit != 0);
579 return (wc->wildcards & mf->fww_bit) != 0;
582 return !wc->tun_id_mask;
584 return !wc->metadata_mask;
587 return !wc->reg_masks[mf->id - MFF_REG0];
590 return eth_addr_is_zero(wc->dl_src_mask);
592 return eth_addr_is_zero(wc->dl_dst_mask);
596 return eth_addr_is_zero(wc->arp_sha_mask);
600 return eth_addr_is_zero(wc->arp_tha_mask);
603 return !wc->vlan_tci_mask;
605 return !(wc->vlan_tci_mask & htons(VLAN_VID_MASK));
607 return !(wc->vlan_tci_mask & htons(VLAN_VID_MASK | VLAN_CFI));
608 case MFF_DL_VLAN_PCP:
610 return !(wc->vlan_tci_mask & htons(VLAN_PCP_MASK));
613 return !wc->nw_src_mask;
615 return !wc->nw_dst_mask;
618 return ipv6_mask_is_any(&wc->ipv6_src_mask);
620 return ipv6_mask_is_any(&wc->ipv6_dst_mask);
623 return !wc->ipv6_label_mask;
626 return !wc->nw_proto_mask;
628 return !(wc->nw_tos_mask & IP_DSCP_MASK);
630 return !(wc->nw_tos_mask & IP_ECN_MASK);
632 return !wc->nw_ttl_mask;
635 return ipv6_mask_is_any(&wc->nd_target_mask);
638 return !(wc->nw_frag_mask & FLOW_NW_FRAG_MASK);
641 return !wc->nw_proto_mask;
643 return !wc->nw_src_mask;
645 return !wc->nw_dst_mask;
649 case MFF_ICMPV4_TYPE:
650 case MFF_ICMPV6_TYPE:
651 return !wc->tp_src_mask;
654 case MFF_ICMPV4_CODE:
655 case MFF_ICMPV6_CODE:
656 return !wc->tp_dst_mask;
664 /* Initializes 'mask' with the wildcard bit pattern for field 'mf' within 'wc'.
665 * Each bit in 'mask' will be set to 1 if the bit is significant for matching
666 * purposes, or to 0 if it is wildcarded.
668 * The caller is responsible for ensuring that 'wc' corresponds to a flow that
669 * meets 'mf''s prerequisites. */
671 mf_get_mask(const struct mf_field *mf, const struct flow_wildcards *wc,
672 union mf_value *mask)
677 assert(mf->fww_bit != 0);
678 memset(mask, wc->wildcards & mf->fww_bit ? 0x00 : 0xff, mf->n_bytes);
682 mask->be64 = wc->tun_id_mask;
685 mask->be64 = wc->metadata_mask;
689 mask->be32 = htonl(wc->reg_masks[mf->id - MFF_REG0]);
693 memcpy(mask->mac, wc->dl_dst_mask, ETH_ADDR_LEN);
697 memcpy(mask->mac, wc->dl_src_mask, ETH_ADDR_LEN);
701 mask->be16 = wc->vlan_tci_mask;
704 mask->be16 = wc->vlan_tci_mask & htons(VLAN_VID_MASK);
707 mask->be16 = wc->vlan_tci_mask & htons(VLAN_VID_MASK | VLAN_CFI);
709 case MFF_DL_VLAN_PCP:
711 mask->u8 = vlan_tci_to_pcp(wc->vlan_tci_mask);
715 mask->be32 = wc->nw_src_mask;
718 mask->be32 = wc->nw_dst_mask;
722 mask->ipv6 = wc->ipv6_src_mask;
725 mask->ipv6 = wc->ipv6_dst_mask;
728 mask->be32 = wc->ipv6_label_mask;
732 mask->u8 = wc->nw_proto_mask;
735 mask->u8 = wc->nw_tos_mask & IP_DSCP_MASK;
738 mask->u8 = wc->nw_tos_mask & IP_ECN_MASK;
742 mask->ipv6 = wc->nd_target_mask;
746 mask->u8 = wc->nw_ttl_mask;
749 mask->u8 = wc->nw_frag_mask & FLOW_NW_FRAG_MASK;
753 mask->u8 = wc->nw_proto_mask;
756 mask->be32 = wc->nw_src_mask;
759 mask->be32 = wc->nw_dst_mask;
763 memcpy(mask->mac, wc->arp_sha_mask, ETH_ADDR_LEN);
767 memcpy(mask->mac, wc->arp_tha_mask, ETH_ADDR_LEN);
772 mask->be16 = wc->tp_src_mask;
776 mask->be16 = wc->tp_dst_mask;
779 case MFF_ICMPV4_TYPE:
780 case MFF_ICMPV6_TYPE:
781 mask->u8 = ntohs(wc->tp_src_mask);
783 case MFF_ICMPV4_CODE:
784 case MFF_ICMPV6_CODE:
785 mask->u8 = ntohs(wc->tp_dst_mask);
794 /* Tests whether 'mask' is a valid wildcard bit pattern for 'mf'. Returns true
795 * if the mask is valid, false otherwise. */
797 mf_is_mask_valid(const struct mf_field *mf, const union mf_value *mask)
799 switch (mf->maskable) {
801 return (is_all_zeros((const uint8_t *) mask, mf->n_bytes) ||
802 is_all_ones((const uint8_t *) mask, mf->n_bytes));
812 is_ip_any(const struct flow *flow)
814 return (flow->dl_type == htons(ETH_TYPE_IP) ||
815 flow->dl_type == htons(ETH_TYPE_IPV6));
819 is_icmpv4(const struct flow *flow)
821 return (flow->dl_type == htons(ETH_TYPE_IP)
822 && flow->nw_proto == IPPROTO_ICMP);
826 is_icmpv6(const struct flow *flow)
828 return (flow->dl_type == htons(ETH_TYPE_IPV6)
829 && flow->nw_proto == IPPROTO_ICMPV6);
832 /* Returns true if 'flow' meets the prerequisites for 'mf', false otherwise. */
834 mf_are_prereqs_ok(const struct mf_field *mf, const struct flow *flow)
836 switch (mf->prereqs) {
841 return flow->dl_type == htons(ETH_TYPE_ARP);
843 return flow->dl_type == htons(ETH_TYPE_IP);
845 return flow->dl_type == htons(ETH_TYPE_IPV6);
847 return (flow->vlan_tci & htons(VLAN_CFI)) != 0;
849 return is_ip_any(flow);
852 return is_ip_any(flow) && flow->nw_proto == IPPROTO_TCP;
854 return is_ip_any(flow) && flow->nw_proto == IPPROTO_UDP;
856 return is_icmpv4(flow);
858 return is_icmpv6(flow);
861 return (is_icmpv6(flow)
862 && flow->tp_dst == htons(0)
863 && (flow->tp_src == htons(ND_NEIGHBOR_SOLICIT) ||
864 flow->tp_src == htons(ND_NEIGHBOR_ADVERT)));
866 return (is_icmpv6(flow)
867 && flow->tp_dst == htons(0)
868 && (flow->tp_src == htons(ND_NEIGHBOR_SOLICIT)));
870 return (is_icmpv6(flow)
871 && flow->tp_dst == htons(0)
872 && (flow->tp_src == htons(ND_NEIGHBOR_ADVERT)));
878 /* Returns true if 'value' may be a valid value *as part of a masked match*,
881 * A value is not rejected just because it is not valid for the field in
882 * question, but only if it doesn't make sense to test the bits in question at
883 * all. For example, the MFF_VLAN_TCI field will never have a nonzero value
884 * without the VLAN_CFI bit being set, but we can't reject those values because
885 * it is still legitimate to test just for those bits (see the documentation
886 * for NXM_OF_VLAN_TCI in nicira-ext.h). On the other hand, there is never a
887 * reason to set the low bit of MFF_IP_DSCP to 1, so we reject that. */
889 mf_is_value_valid(const struct mf_field *mf, const union mf_value *value)
914 case MFF_ICMPV4_TYPE:
915 case MFF_ICMPV4_CODE:
916 case MFF_ICMPV6_TYPE:
917 case MFF_ICMPV6_CODE:
924 return !(value->u8 & ~IP_DSCP_MASK);
926 return !(value->u8 & ~IP_ECN_MASK);
928 return !(value->u8 & ~FLOW_NW_FRAG_MASK);
931 return !(value->be16 & htons(0xff00));
934 return !(value->be16 & htons(VLAN_CFI | VLAN_PCP_MASK));
936 return !(value->be16 & htons(VLAN_PCP_MASK));
938 case MFF_DL_VLAN_PCP:
940 return !(value->u8 & ~(VLAN_PCP_MASK >> VLAN_PCP_SHIFT));
943 return !(value->be32 & ~htonl(IPV6_LABEL_MASK));
951 /* Copies the value of field 'mf' from 'flow' into 'value'. The caller is
952 * responsible for ensuring that 'flow' meets 'mf''s prerequisites. */
954 mf_get_value(const struct mf_field *mf, const struct flow *flow,
955 union mf_value *value)
959 value->be64 = flow->tun_id;
962 value->be64 = flow->metadata;
966 value->be16 = htons(flow->in_port);
970 value->be32 = htonl(flow->regs[mf->id - MFF_REG0]);
974 memcpy(value->mac, flow->dl_src, ETH_ADDR_LEN);
978 memcpy(value->mac, flow->dl_dst, ETH_ADDR_LEN);
982 value->be16 = flow->dl_type;
986 value->be16 = flow->vlan_tci;
990 value->be16 = flow->vlan_tci & htons(VLAN_VID_MASK);
993 value->be16 = flow->vlan_tci & htons(VLAN_VID_MASK | VLAN_CFI);
996 case MFF_DL_VLAN_PCP:
998 value->u8 = vlan_tci_to_pcp(flow->vlan_tci);
1002 value->be32 = flow->nw_src;
1006 value->be32 = flow->nw_dst;
1010 value->ipv6 = flow->ipv6_src;
1014 value->ipv6 = flow->ipv6_dst;
1017 case MFF_IPV6_LABEL:
1018 value->be32 = flow->ipv6_label;
1022 value->u8 = flow->nw_proto;
1026 value->u8 = flow->nw_tos & IP_DSCP_MASK;
1030 value->u8 = flow->nw_tos & IP_ECN_MASK;
1034 value->u8 = flow->nw_ttl;
1038 value->u8 = flow->nw_frag;
1042 value->be16 = htons(flow->nw_proto);
1046 value->be32 = flow->nw_src;
1050 value->be32 = flow->nw_dst;
1055 memcpy(value->mac, flow->arp_sha, ETH_ADDR_LEN);
1060 memcpy(value->mac, flow->arp_tha, ETH_ADDR_LEN);
1065 value->be16 = flow->tp_src;
1070 value->be16 = flow->tp_dst;
1073 case MFF_ICMPV4_TYPE:
1074 case MFF_ICMPV6_TYPE:
1075 value->u8 = ntohs(flow->tp_src);
1078 case MFF_ICMPV4_CODE:
1079 case MFF_ICMPV6_CODE:
1080 value->u8 = ntohs(flow->tp_dst);
1084 value->ipv6 = flow->nd_target;
1093 /* Makes 'rule' match field 'mf' exactly, with the value matched taken from
1094 * 'value'. The caller is responsible for ensuring that 'rule' meets 'mf''s
1097 mf_set_value(const struct mf_field *mf,
1098 const union mf_value *value, struct cls_rule *rule)
1102 cls_rule_set_tun_id(rule, value->be64);
1105 cls_rule_set_metadata(rule, value->be64);
1109 cls_rule_set_in_port(rule, ntohs(value->be16));
1113 cls_rule_set_reg(rule, mf->id - MFF_REG0, ntohl(value->be32));
1117 cls_rule_set_dl_src(rule, value->mac);
1121 cls_rule_set_dl_dst(rule, value->mac);
1125 cls_rule_set_dl_type(rule, value->be16);
1129 cls_rule_set_dl_tci(rule, value->be16);
1133 cls_rule_set_dl_vlan(rule, value->be16);
1136 cls_rule_set_vlan_vid(rule, value->be16);
1139 case MFF_DL_VLAN_PCP:
1141 cls_rule_set_dl_vlan_pcp(rule, value->u8);
1145 cls_rule_set_nw_src(rule, value->be32);
1149 cls_rule_set_nw_dst(rule, value->be32);
1153 cls_rule_set_ipv6_src(rule, &value->ipv6);
1157 cls_rule_set_ipv6_dst(rule, &value->ipv6);
1160 case MFF_IPV6_LABEL:
1161 cls_rule_set_ipv6_label(rule, value->be32);
1165 cls_rule_set_nw_proto(rule, value->u8);
1169 cls_rule_set_nw_dscp(rule, value->u8);
1173 cls_rule_set_nw_ecn(rule, value->u8);
1177 cls_rule_set_nw_ttl(rule, value->u8);
1181 cls_rule_set_nw_frag(rule, value->u8);
1185 cls_rule_set_nw_proto(rule, ntohs(value->be16));
1189 cls_rule_set_nw_src(rule, value->be32);
1193 cls_rule_set_nw_dst(rule, value->be32);
1198 cls_rule_set_arp_sha(rule, value->mac);
1203 cls_rule_set_arp_tha(rule, value->mac);
1208 cls_rule_set_tp_src(rule, value->be16);
1213 cls_rule_set_tp_dst(rule, value->be16);
1216 case MFF_ICMPV4_TYPE:
1217 case MFF_ICMPV6_TYPE:
1218 cls_rule_set_icmp_type(rule, value->u8);
1221 case MFF_ICMPV4_CODE:
1222 case MFF_ICMPV6_CODE:
1223 cls_rule_set_icmp_code(rule, value->u8);
1227 cls_rule_set_nd_target(rule, &value->ipv6);
1236 /* Makes 'rule' match field 'mf' exactly, with the value matched taken from
1237 * 'value'. The caller is responsible for ensuring that 'rule' meets 'mf''s
1240 mf_set_flow_value(const struct mf_field *mf,
1241 const union mf_value *value, struct flow *flow)
1245 flow->tun_id = value->be64;
1248 flow->metadata = value->be64;
1252 flow->in_port = ntohs(value->be16);
1256 flow->regs[mf->id - MFF_REG0] = ntohl(value->be32);
1260 memcpy(flow->dl_src, value->mac, ETH_ADDR_LEN);
1264 memcpy(flow->dl_dst, value->mac, ETH_ADDR_LEN);
1268 flow->dl_type = value->be16;
1272 flow->vlan_tci = value->be16;
1276 flow_set_dl_vlan(flow, value->be16);
1279 flow_set_vlan_vid(flow, value->be16);
1282 case MFF_DL_VLAN_PCP:
1284 flow_set_vlan_pcp(flow, value->u8);
1288 flow->nw_src = value->be32;
1292 flow->nw_dst = value->be32;
1296 flow->ipv6_src = value->ipv6;
1300 flow->ipv6_dst = value->ipv6;
1303 case MFF_IPV6_LABEL:
1304 flow->ipv6_label = value->be32 & ~htonl(IPV6_LABEL_MASK);
1308 flow->nw_proto = value->u8;
1312 flow->nw_tos &= ~IP_DSCP_MASK;
1313 flow->nw_tos |= value->u8 & IP_DSCP_MASK;
1317 flow->nw_tos &= ~IP_ECN_MASK;
1318 flow->nw_tos |= value->u8 & IP_ECN_MASK;
1322 flow->nw_ttl = value->u8;
1326 flow->nw_frag &= value->u8;
1330 flow->nw_proto = ntohs(value->be16);
1334 flow->nw_src = value->be32;
1338 flow->nw_dst = value->be32;
1343 memcpy(flow->arp_sha, value->mac, ETH_ADDR_LEN);
1348 memcpy(flow->arp_tha, value->mac, ETH_ADDR_LEN);
1353 flow->tp_src = value->be16;
1358 flow->tp_dst = value->be16;
1361 case MFF_ICMPV4_TYPE:
1362 case MFF_ICMPV6_TYPE:
1363 flow->tp_src = htons(value->u8);
1366 case MFF_ICMPV4_CODE:
1367 case MFF_ICMPV6_CODE:
1368 flow->tp_dst = htons(value->u8);
1372 flow->nd_target = value->ipv6;
1381 /* Returns true if 'mf' has a zero value in 'flow', false if it is nonzero.
1383 * The caller is responsible for ensuring that 'flow' meets 'mf''s
1386 mf_is_zero(const struct mf_field *mf, const struct flow *flow)
1388 union mf_value value;
1390 mf_get_value(mf, flow, &value);
1391 return is_all_zeros((const uint8_t *) &value, mf->n_bytes);
1394 /* Makes 'rule' wildcard field 'mf'.
1396 * The caller is responsible for ensuring that 'rule' meets 'mf''s
1399 mf_set_wild(const struct mf_field *mf, struct cls_rule *rule)
1403 cls_rule_set_tun_id_masked(rule, htonll(0), htonll(0));
1406 cls_rule_set_metadata_masked(rule, htonll(0), htonll(0));
1409 rule->wc.wildcards |= FWW_IN_PORT;
1410 rule->flow.in_port = 0;
1414 cls_rule_set_reg_masked(rule, mf->id - MFF_REG0, 0, 0);
1418 memset(rule->flow.dl_src, 0, ETH_ADDR_LEN);
1419 memset(rule->wc.dl_src_mask, 0, ETH_ADDR_LEN);
1423 memset(rule->flow.dl_dst, 0, ETH_ADDR_LEN);
1424 memset(rule->wc.dl_dst_mask, 0, ETH_ADDR_LEN);
1428 rule->wc.wildcards |= FWW_DL_TYPE;
1429 rule->flow.dl_type = htons(0);
1433 cls_rule_set_dl_tci_masked(rule, htons(0), htons(0));
1438 cls_rule_set_any_vid(rule);
1441 case MFF_DL_VLAN_PCP:
1443 cls_rule_set_any_pcp(rule);
1448 cls_rule_set_nw_src_masked(rule, htonl(0), htonl(0));
1453 cls_rule_set_nw_dst_masked(rule, htonl(0), htonl(0));
1457 memset(&rule->wc.ipv6_src_mask, 0, sizeof rule->wc.ipv6_src_mask);
1458 memset(&rule->flow.ipv6_src, 0, sizeof rule->flow.ipv6_src);
1462 memset(&rule->wc.ipv6_dst_mask, 0, sizeof rule->wc.ipv6_dst_mask);
1463 memset(&rule->flow.ipv6_dst, 0, sizeof rule->flow.ipv6_dst);
1466 case MFF_IPV6_LABEL:
1467 rule->wc.ipv6_label_mask = 0;
1468 rule->flow.ipv6_label = 0;
1472 rule->wc.nw_proto_mask = 0;
1473 rule->flow.nw_proto = 0;
1477 rule->wc.nw_tos_mask &= ~IP_DSCP_MASK;
1478 rule->flow.nw_tos &= ~IP_DSCP_MASK;
1482 rule->wc.nw_tos_mask &= ~IP_ECN_MASK;
1483 rule->flow.nw_tos &= ~IP_ECN_MASK;
1487 rule->wc.nw_ttl_mask = 0;
1488 rule->flow.nw_ttl = 0;
1492 rule->wc.nw_frag_mask |= FLOW_NW_FRAG_MASK;
1493 rule->flow.nw_frag &= ~FLOW_NW_FRAG_MASK;
1497 rule->wc.nw_proto_mask = 0;
1498 rule->flow.nw_proto = 0;
1503 memset(rule->flow.arp_sha, 0, ETH_ADDR_LEN);
1504 memset(rule->wc.arp_sha_mask, 0, ETH_ADDR_LEN);
1509 memset(rule->flow.arp_tha, 0, ETH_ADDR_LEN);
1510 memset(rule->wc.arp_tha_mask, 0, ETH_ADDR_LEN);
1515 case MFF_ICMPV4_TYPE:
1516 case MFF_ICMPV6_TYPE:
1517 rule->wc.tp_src_mask = htons(0);
1518 rule->flow.tp_src = htons(0);
1523 case MFF_ICMPV4_CODE:
1524 case MFF_ICMPV6_CODE:
1525 rule->wc.tp_dst_mask = htons(0);
1526 rule->flow.tp_dst = htons(0);
1530 memset(&rule->wc.nd_target_mask, 0, sizeof rule->wc.nd_target_mask);
1531 memset(&rule->flow.nd_target, 0, sizeof rule->flow.nd_target);
1540 /* Makes 'rule' match field 'mf' with the specified 'value' and 'mask'.
1541 * 'value' specifies a value to match and 'mask' specifies a wildcard pattern,
1542 * with a 1-bit indicating that the corresponding value bit must match and a
1543 * 0-bit indicating a don't-care.
1545 * If 'mask' is NULL or points to all-1-bits, then this call is equivalent to
1546 * mf_set_value(mf, value, rule). If 'mask' points to all-0-bits, then this
1547 * call is equivalent to mf_set_wild(mf, rule).
1549 * 'mask' must be a valid mask for 'mf' (see mf_is_mask_valid()). The caller
1550 * is responsible for ensuring that 'rule' meets 'mf''s prerequisites. */
1552 mf_set(const struct mf_field *mf,
1553 const union mf_value *value, const union mf_value *mask,
1554 struct cls_rule *rule)
1556 if (!mask || is_all_ones((const uint8_t *) mask, mf->n_bytes)) {
1557 mf_set_value(mf, value, rule);
1559 } else if (is_all_zeros((const uint8_t *) mask, mf->n_bytes)) {
1560 mf_set_wild(mf, rule);
1568 case MFF_DL_VLAN_PCP:
1575 case MFF_ICMPV4_TYPE:
1576 case MFF_ICMPV4_CODE:
1577 case MFF_ICMPV6_TYPE:
1578 case MFF_ICMPV6_CODE:
1582 cls_rule_set_tun_id_masked(rule, value->be64, mask->be64);
1585 cls_rule_set_metadata_masked(rule, value->be64, mask->be64);
1589 cls_rule_set_reg_masked(rule, mf->id - MFF_REG0,
1590 ntohl(value->be32), ntohl(mask->be32));
1594 cls_rule_set_dl_dst_masked(rule, value->mac, mask->mac);
1598 cls_rule_set_dl_src_masked(rule, value->mac, mask->mac);
1603 cls_rule_set_arp_sha_masked(rule, value->mac, mask->mac);
1608 cls_rule_set_arp_tha_masked(rule, value->mac, mask->mac);
1612 cls_rule_set_dl_tci_masked(rule, value->be16, mask->be16);
1616 cls_rule_set_vlan_vid_masked(rule, value->be16, mask->be16);
1620 cls_rule_set_nw_src_masked(rule, value->be32, mask->be32);
1624 cls_rule_set_nw_dst_masked(rule, value->be32, mask->be32);
1628 cls_rule_set_ipv6_src_masked(rule, &value->ipv6, &mask->ipv6);
1632 cls_rule_set_ipv6_dst_masked(rule, &value->ipv6, &mask->ipv6);
1635 case MFF_IPV6_LABEL:
1636 if ((mask->be32 & htonl(IPV6_LABEL_MASK)) == htonl(IPV6_LABEL_MASK)) {
1637 mf_set_value(mf, value, rule);
1639 cls_rule_set_ipv6_label_masked(rule, value->be32, mask->be32);
1644 cls_rule_set_nd_target_masked(rule, &value->ipv6, &mask->ipv6);
1648 cls_rule_set_nw_frag_masked(rule, value->u8, mask->u8);
1652 cls_rule_set_nw_src_masked(rule, value->be32, mask->be32);
1656 cls_rule_set_nw_dst_masked(rule, value->be32, mask->be32);
1661 cls_rule_set_tp_src_masked(rule, value->be16, mask->be16);
1666 cls_rule_set_tp_dst_masked(rule, value->be16, mask->be16);
1676 mf_check__(const struct mf_subfield *sf, const struct flow *flow,
1680 VLOG_WARN_RL(&rl, "unknown %s field", type);
1681 } else if (!sf->n_bits) {
1682 VLOG_WARN_RL(&rl, "zero bit %s field %s", type, sf->field->name);
1683 } else if (sf->ofs >= sf->field->n_bits) {
1684 VLOG_WARN_RL(&rl, "bit offset %d exceeds %d-bit width of %s field %s",
1685 sf->ofs, sf->field->n_bits, type, sf->field->name);
1686 } else if (sf->ofs + sf->n_bits > sf->field->n_bits) {
1687 VLOG_WARN_RL(&rl, "bit offset %d and width %d exceeds %d-bit width "
1688 "of %s field %s", sf->ofs, sf->n_bits,
1689 sf->field->n_bits, type, sf->field->name);
1690 } else if (flow && !mf_are_prereqs_ok(sf->field, flow)) {
1691 VLOG_WARN_RL(&rl, "%s field %s lacks correct prerequisites",
1692 type, sf->field->name);
1697 return OFPERR_OFPBAC_BAD_ARGUMENT;
1700 /* Checks whether 'sf' is valid for reading a subfield out of 'flow'. Returns
1701 * 0 if so, otherwise an OpenFlow error code (e.g. as returned by
1704 mf_check_src(const struct mf_subfield *sf, const struct flow *flow)
1706 return mf_check__(sf, flow, "source");
1709 /* Checks whether 'sf' is valid for writing a subfield into 'flow'. Returns 0
1710 * if so, otherwise an OpenFlow error code (e.g. as returned by
1713 mf_check_dst(const struct mf_subfield *sf, const struct flow *flow)
1715 int error = mf_check__(sf, flow, "destination");
1716 if (!error && !sf->field->writable) {
1717 VLOG_WARN_RL(&rl, "destination field %s is not writable",
1719 return OFPERR_OFPBAC_BAD_ARGUMENT;
1724 /* Copies the value and wildcard bit pattern for 'mf' from 'rule' into the
1725 * 'value' and 'mask', respectively. */
1727 mf_get(const struct mf_field *mf, const struct cls_rule *rule,
1728 union mf_value *value, union mf_value *mask)
1730 mf_get_value(mf, &rule->flow, value);
1731 mf_get_mask(mf, &rule->wc, mask);
1734 /* Assigns a random value for field 'mf' to 'value'. */
1736 mf_random_value(const struct mf_field *mf, union mf_value *value)
1738 random_bytes(value, mf->n_bytes);
1763 case MFF_ICMPV4_TYPE:
1764 case MFF_ICMPV4_CODE:
1765 case MFF_ICMPV6_TYPE:
1766 case MFF_ICMPV6_CODE:
1772 case MFF_IPV6_LABEL:
1773 value->be32 &= ~htonl(IPV6_LABEL_MASK);
1777 value->u8 &= IP_DSCP_MASK;
1781 value->u8 &= IP_ECN_MASK;
1785 value->u8 &= FLOW_NW_FRAG_MASK;
1789 value->be16 &= htons(0xff);
1793 value->be16 &= htons(VLAN_VID_MASK);
1796 value->be16 &= htons(VLAN_VID_MASK | VLAN_CFI);
1799 case MFF_DL_VLAN_PCP:
1811 mf_from_integer_string(const struct mf_field *mf, const char *s,
1812 uint8_t *valuep, uint8_t *maskp)
1814 unsigned long long int integer, mask;
1819 integer = strtoull(s, &tail, 0);
1820 if (errno || (*tail != '\0' && *tail != '/')) {
1825 mask = strtoull(tail + 1, &tail, 0);
1826 if (errno || *tail != '\0') {
1833 for (i = mf->n_bytes - 1; i >= 0; i--) {
1834 valuep[i] = integer;
1840 return xasprintf("%s: value too large for %u-byte field %s",
1841 s, mf->n_bytes, mf->name);
1846 return xasprintf("%s: bad syntax for %s", s, mf->name);
1850 mf_from_ethernet_string(const struct mf_field *mf, const char *s,
1851 uint8_t mac[ETH_ADDR_LEN],
1852 uint8_t mask[ETH_ADDR_LEN])
1854 assert(mf->n_bytes == ETH_ADDR_LEN);
1856 switch (sscanf(s, ETH_ADDR_SCAN_FMT"/"ETH_ADDR_SCAN_FMT,
1857 ETH_ADDR_SCAN_ARGS(mac), ETH_ADDR_SCAN_ARGS(mask))){
1858 case ETH_ADDR_SCAN_COUNT * 2:
1861 case ETH_ADDR_SCAN_COUNT:
1862 memset(mask, 0xff, ETH_ADDR_LEN);
1866 return xasprintf("%s: invalid Ethernet address", s);
1871 mf_from_ipv4_string(const struct mf_field *mf, const char *s,
1872 ovs_be32 *ip, ovs_be32 *mask)
1876 assert(mf->n_bytes == sizeof *ip);
1878 if (sscanf(s, IP_SCAN_FMT"/"IP_SCAN_FMT,
1879 IP_SCAN_ARGS(ip), IP_SCAN_ARGS(mask)) == IP_SCAN_COUNT * 2) {
1881 } else if (sscanf(s, IP_SCAN_FMT"/%d",
1882 IP_SCAN_ARGS(ip), &prefix) == IP_SCAN_COUNT + 1) {
1883 if (prefix <= 0 || prefix > 32) {
1884 return xasprintf("%s: network prefix bits not between 1 and "
1886 } else if (prefix == 32) {
1887 *mask = htonl(UINT32_MAX);
1889 *mask = htonl(((1u << prefix) - 1) << (32 - prefix));
1891 } else if (sscanf(s, IP_SCAN_FMT, IP_SCAN_ARGS(ip)) == IP_SCAN_COUNT) {
1892 *mask = htonl(UINT32_MAX);
1894 return xasprintf("%s: invalid IP address", s);
1900 mf_from_ipv6_string(const struct mf_field *mf, const char *s,
1901 struct in6_addr *value, struct in6_addr *mask)
1903 char *str = xstrdup(s);
1904 char *save_ptr = NULL;
1905 const char *name, *netmask;
1908 assert(mf->n_bytes == sizeof *value);
1910 name = strtok_r(str, "/", &save_ptr);
1911 retval = name ? lookup_ipv6(name, value) : EINVAL;
1915 err = xasprintf("%s: could not convert to IPv6 address", str);
1921 netmask = strtok_r(NULL, "/", &save_ptr);
1923 if (inet_pton(AF_INET6, netmask, mask) != 1) {
1924 int prefix = atoi(netmask);
1925 if (prefix <= 0 || prefix > 128) {
1927 return xasprintf("%s: prefix bits not between 1 and 128", s);
1929 *mask = ipv6_create_mask(prefix);
1933 *mask = in6addr_exact;
1941 mf_from_ofp_port_string(const struct mf_field *mf, const char *s,
1942 ovs_be16 *valuep, ovs_be16 *maskp)
1946 assert(mf->n_bytes == sizeof(ovs_be16));
1947 if (ofputil_port_from_string(s, &port)) {
1948 *valuep = htons(port);
1949 *maskp = htons(UINT16_MAX);
1952 return mf_from_integer_string(mf, s,
1953 (uint8_t *) valuep, (uint8_t *) maskp);
1957 struct frag_handling {
1963 static const struct frag_handling all_frags[] = {
1964 #define A FLOW_NW_FRAG_ANY
1965 #define L FLOW_NW_FRAG_LATER
1966 /* name mask value */
1969 { "first", A|L, A },
1970 { "later", A|L, A|L },
1975 { "not_later", L, 0 },
1982 mf_from_frag_string(const char *s, uint8_t *valuep, uint8_t *maskp)
1984 const struct frag_handling *h;
1986 for (h = all_frags; h < &all_frags[ARRAY_SIZE(all_frags)]; h++) {
1987 if (!strcasecmp(s, h->name)) {
1988 /* We force the upper bits of the mask on to make mf_parse_value()
1989 * happy (otherwise it will never think it's an exact match.) */
1990 *maskp = h->mask | ~FLOW_NW_FRAG_MASK;
1996 return xasprintf("%s: unknown fragment type (valid types are \"no\", "
1997 "\"yes\", \"first\", \"later\", \"not_first\"", s);
2000 /* Parses 's', a string value for field 'mf', into 'value' and 'mask'. Returns
2001 * NULL if successful, otherwise a malloc()'d string describing the error. */
2003 mf_parse(const struct mf_field *mf, const char *s,
2004 union mf_value *value, union mf_value *mask)
2006 if (!strcasecmp(s, "any") || !strcmp(s, "*")) {
2007 memset(value, 0, mf->n_bytes);
2008 memset(mask, 0, mf->n_bytes);
2012 switch (mf->string) {
2014 case MFS_HEXADECIMAL:
2015 return mf_from_integer_string(mf, s,
2016 (uint8_t *) value, (uint8_t *) mask);
2019 return mf_from_ethernet_string(mf, s, value->mac, mask->mac);
2022 return mf_from_ipv4_string(mf, s, &value->be32, &mask->be32);
2025 return mf_from_ipv6_string(mf, s, &value->ipv6, &mask->ipv6);
2028 return mf_from_ofp_port_string(mf, s, &value->be16, &mask->be16);
2031 return mf_from_frag_string(s, &value->u8, &mask->u8);
2036 /* Parses 's', a string value for field 'mf', into 'value'. Returns NULL if
2037 * successful, otherwise a malloc()'d string describing the error. */
2039 mf_parse_value(const struct mf_field *mf, const char *s, union mf_value *value)
2041 union mf_value mask;
2044 error = mf_parse(mf, s, value, &mask);
2049 if (!is_all_ones((const uint8_t *) &mask, mf->n_bytes)) {
2050 return xasprintf("%s: wildcards not allowed here", s);
2056 mf_format_integer_string(const struct mf_field *mf, const uint8_t *valuep,
2057 const uint8_t *maskp, struct ds *s)
2059 unsigned long long int integer;
2062 assert(mf->n_bytes <= 8);
2065 for (i = 0; i < mf->n_bytes; i++) {
2066 integer = (integer << 8) | valuep[i];
2068 if (mf->string == MFS_HEXADECIMAL) {
2069 ds_put_format(s, "%#llx", integer);
2071 ds_put_format(s, "%lld", integer);
2075 unsigned long long int mask;
2078 for (i = 0; i < mf->n_bytes; i++) {
2079 mask = (mask << 8) | maskp[i];
2082 /* I guess we could write the mask in decimal for MFS_DECIMAL but I'm
2083 * not sure that that a bit-mask written in decimal is ever easier to
2084 * understand than the same bit-mask written in hexadecimal. */
2085 ds_put_format(s, "/%#llx", mask);
2090 mf_format_frag_string(const uint8_t *valuep, const uint8_t *maskp,
2093 const struct frag_handling *h;
2094 uint8_t value = *valuep;
2095 uint8_t mask = *maskp;
2098 mask &= FLOW_NW_FRAG_MASK;
2100 for (h = all_frags; h < &all_frags[ARRAY_SIZE(all_frags)]; h++) {
2101 if (value == h->value && mask == h->mask) {
2102 ds_put_cstr(s, h->name);
2106 ds_put_cstr(s, "<error>");
2109 /* Appends to 's' a string representation of field 'mf' whose value is in
2110 * 'value' and 'mask'. 'mask' may be NULL to indicate an exact match. */
2112 mf_format(const struct mf_field *mf,
2113 const union mf_value *value, const union mf_value *mask,
2117 if (is_all_zeros((const uint8_t *) mask, mf->n_bytes)) {
2118 ds_put_cstr(s, "ANY");
2120 } else if (is_all_ones((const uint8_t *) mask, mf->n_bytes)) {
2125 switch (mf->string) {
2128 ofputil_format_port(ntohs(value->be16), s);
2133 case MFS_HEXADECIMAL:
2134 mf_format_integer_string(mf, (uint8_t *) value, (uint8_t *) mask, s);
2138 eth_format_masked(value->mac, mask->mac, s);
2142 ip_format_masked(value->be32, mask ? mask->be32 : htonl(UINT32_MAX),
2147 print_ipv6_masked(s, &value->ipv6, mask ? &mask->ipv6 : NULL);
2151 mf_format_frag_string(&value->u8, &mask->u8, s);
2159 /* Makes subfield 'sf' within 'rule' exactly match the 'sf->n_bits'
2160 * least-significant bits in 'x'.
2163 mf_write_subfield(const struct mf_subfield *sf, const union mf_subvalue *x,
2164 struct cls_rule *rule)
2166 const struct mf_field *field = sf->field;
2167 union mf_value value, mask;
2169 mf_get(field, rule, &value, &mask);
2170 bitwise_copy(x, sizeof *x, 0, &value, field->n_bytes, sf->ofs, sf->n_bits);
2171 bitwise_one ( &mask, field->n_bytes, sf->ofs, sf->n_bits);
2172 mf_set(field, &value, &mask, rule);
2175 /* Initializes 'x' to the value of 'sf' within 'flow'. 'sf' must be valid for
2176 * reading 'flow', e.g. as checked by mf_check_src(). */
2178 mf_read_subfield(const struct mf_subfield *sf, const struct flow *flow,
2179 union mf_subvalue *x)
2181 union mf_value value;
2183 mf_get_value(sf->field, flow, &value);
2185 memset(x, 0, sizeof *x);
2186 bitwise_copy(&value, sf->field->n_bytes, sf->ofs,
2191 /* Returns the value of 'sf' within 'flow'. 'sf' must be valid for reading
2192 * 'flow', e.g. as checked by mf_check_src() and sf->n_bits must be 64 or
2195 mf_get_subfield(const struct mf_subfield *sf, const struct flow *flow)
2197 union mf_value value;
2199 mf_get_value(sf->field, flow, &value);
2200 return bitwise_get(&value, sf->field->n_bytes, sf->ofs, sf->n_bits);
2203 /* Formats 'sf' into 's' in a format normally acceptable to
2204 * mf_parse_subfield(). (It won't be acceptable if sf->field is NULL or if
2205 * sf->field has no NXM name.) */
2207 mf_format_subfield(const struct mf_subfield *sf, struct ds *s)
2210 ds_put_cstr(s, "<unknown>");
2211 } else if (sf->field->nxm_name) {
2212 ds_put_cstr(s, sf->field->nxm_name);
2213 } else if (sf->field->nxm_header) {
2214 uint32_t header = sf->field->nxm_header;
2215 ds_put_format(s, "%d:%d", NXM_VENDOR(header), NXM_FIELD(header));
2217 ds_put_cstr(s, sf->field->name);
2220 if (sf->field && sf->ofs == 0 && sf->n_bits == sf->field->n_bits) {
2221 ds_put_cstr(s, "[]");
2222 } else if (sf->n_bits == 1) {
2223 ds_put_format(s, "[%d]", sf->ofs);
2225 ds_put_format(s, "[%d..%d]", sf->ofs, sf->ofs + sf->n_bits - 1);
2229 static const struct mf_field *
2230 mf_parse_subfield_name(const char *name, int name_len, bool *wild)
2234 *wild = name_len > 2 && !memcmp(&name[name_len - 2], "_W", 2);
2239 for (i = 0; i < MFF_N_IDS; i++) {
2240 const struct mf_field *mf = mf_from_id(i);
2243 && !strncmp(mf->nxm_name, name, name_len)
2244 && mf->nxm_name[name_len] == '\0') {
2248 && !strncmp(mf->oxm_name, name, name_len)
2249 && mf->oxm_name[name_len] == '\0') {
2257 /* Parses a subfield from the beginning of '*sp' into 'sf'. If successful,
2258 * returns NULL and advances '*sp' to the first byte following the parsed
2259 * string. On failure, returns a malloc()'d error message, does not modify
2260 * '*sp', and does not properly initialize 'sf'.
2262 * The syntax parsed from '*sp' takes the form "header[start..end]" where
2263 * 'header' is the name of an NXM field and 'start' and 'end' are (inclusive)
2264 * bit indexes. "..end" may be omitted to indicate a single bit. "start..end"
2265 * may both be omitted (the [] are still required) to indicate an entire
2268 mf_parse_subfield__(struct mf_subfield *sf, const char **sp)
2270 const struct mf_field *field;
2279 name_len = strcspn(s, "[");
2280 if (s[name_len] != '[') {
2281 return xasprintf("%s: missing [ looking for field name", *sp);
2284 field = mf_parse_subfield_name(name, name_len, &wild);
2286 return xasprintf("%s: unknown field `%.*s'", *sp, name_len, s);
2290 if (sscanf(s, "[%d..%d]", &start, &end) == 2) {
2291 /* Nothing to do. */
2292 } else if (sscanf(s, "[%d]", &start) == 1) {
2294 } else if (!strncmp(s, "[]", 2)) {
2296 end = field->n_bits - 1;
2298 return xasprintf("%s: syntax error expecting [] or [<bit>] or "
2299 "[<start>..<end>]", *sp);
2301 s = strchr(s, ']') + 1;
2304 return xasprintf("%s: starting bit %d is after ending bit %d",
2306 } else if (start >= field->n_bits) {
2307 return xasprintf("%s: starting bit %d is not valid because field is "
2308 "only %d bits wide", *sp, start, field->n_bits);
2309 } else if (end >= field->n_bits){
2310 return xasprintf("%s: ending bit %d is not valid because field is "
2311 "only %d bits wide", *sp, end, field->n_bits);
2316 sf->n_bits = end - start + 1;
2322 /* Parses a subfield from the beginning of 's' into 'sf'. Returns the first
2323 * byte in 's' following the parsed string.
2325 * Exits with an error message if 's' has incorrect syntax.
2327 * The syntax parsed from 's' takes the form "header[start..end]" where
2328 * 'header' is the name of an NXM field and 'start' and 'end' are (inclusive)
2329 * bit indexes. "..end" may be omitted to indicate a single bit. "start..end"
2330 * may both be omitted (the [] are still required) to indicate an entire
2333 mf_parse_subfield(struct mf_subfield *sf, const char *s)
2335 char *msg = mf_parse_subfield__(sf, &s);
2337 ovs_fatal(0, "%s", msg);