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_IN_PORT, "in_port", NULL,
61 MFM_NONE, FWW_IN_PORT,
65 NXM_OF_IN_PORT, "NXM_OF_IN_PORT",
66 OXM_OF_IN_PORT, "OXM_OF_IN_PORT",
69 #define REGISTER(IDX) \
71 MFF_REG##IDX, "reg" #IDX, NULL, \
72 MF_FIELD_SIZES(be32), \
77 NXM_NX_REG(IDX), "NXM_NX_REG" #IDX, \
78 NXM_NX_REG(IDX), "NXM_NX_REG" #IDX, \
113 MFF_ETH_SRC, "eth_src", "dl_src",
119 NXM_OF_ETH_SRC, "NXM_OF_ETH_SRC",
120 OXM_OF_ETH_SRC, "OXM_OF_ETH_SRC",
122 MFF_ETH_DST, "eth_dst", "dl_dst",
128 NXM_OF_ETH_DST, "NXM_OF_ETH_DST",
129 OXM_OF_ETH_DST, "OXM_OF_ETH_DST",
131 MFF_ETH_TYPE, "eth_type", "dl_type",
132 MF_FIELD_SIZES(be16),
133 MFM_NONE, FWW_DL_TYPE,
137 NXM_OF_ETH_TYPE, "NXM_OF_ETH_TYPE",
138 OXM_OF_ETH_TYPE, "OXM_OF_ETH_TYPE",
142 MFF_VLAN_TCI, "vlan_tci", NULL,
143 MF_FIELD_SIZES(be16),
148 NXM_OF_VLAN_TCI, "NXM_OF_VLAN_TCI",
149 NXM_OF_VLAN_TCI, "NXM_OF_VLAN_TCI",
151 MFF_VLAN_VID, "dl_vlan", NULL,
152 sizeof(ovs_be16), 12,
157 OXM_OF_VLAN_VID, "OXM_OF_VLAN_VID",
158 OXM_OF_VLAN_VID, "OXM_OF_VLAN_VID",
160 MFF_VLAN_PCP, "dl_vlan_pcp", NULL,
166 OXM_OF_VLAN_PCP, "OXM_OF_VLAN_PCP",
167 OXM_OF_VLAN_PCP, "OXM_OF_VLAN_PCP",
175 MFF_IPV4_SRC, "ip_src", "nw_src",
176 MF_FIELD_SIZES(be32),
181 NXM_OF_IP_SRC, "NXM_OF_IP_SRC",
182 OXM_OF_IPV4_SRC, "OXM_OF_IPV4_SRC",
184 MFF_IPV4_DST, "ip_dst", "nw_dst",
185 MF_FIELD_SIZES(be32),
190 NXM_OF_IP_DST, "NXM_OF_IP_DST",
191 OXM_OF_IPV4_DST, "OXM_OF_IPV4_DST",
195 MFF_IPV6_SRC, "ipv6_src", NULL,
196 MF_FIELD_SIZES(ipv6),
201 NXM_NX_IPV6_SRC, "NXM_NX_IPV6_SRC",
202 OXM_OF_IPV6_SRC, "OXM_OF_IPV6_SRC",
204 MFF_IPV6_DST, "ipv6_dst", NULL,
205 MF_FIELD_SIZES(ipv6),
210 NXM_NX_IPV6_DST, "NXM_NX_IPV6_DST",
211 OXM_OF_IPV6_DST, "OXM_OF_IPV6_DST",
214 MFF_IPV6_LABEL, "ipv6_label", NULL,
216 MFM_NONE, FWW_IPV6_LABEL,
220 NXM_NX_IPV6_LABEL, "NXM_NX_IPV6_LABEL",
221 OXM_OF_IPV6_FLABEL, "OXM_OF_IPV6_FLABEL",
225 MFF_IP_PROTO, "nw_proto", NULL,
227 MFM_NONE, FWW_NW_PROTO,
231 NXM_OF_IP_PROTO, "NXM_OF_IP_PROTO",
232 OXM_OF_IP_PROTO, "OXM_OF_IP_PROTO",
234 MFF_IP_DSCP, "nw_tos", NULL,
236 MFM_NONE, FWW_NW_DSCP,
240 NXM_OF_IP_TOS, "NXM_OF_IP_TOS",
241 OXM_OF_IP_DSCP, "OXM_OF_IP_DSCP",
243 MFF_IP_ECN, "nw_ecn", NULL,
245 MFM_NONE, FWW_NW_ECN,
249 NXM_NX_IP_ECN, "NXM_NX_IP_ECN",
250 OXM_OF_IP_ECN, "OXM_OF_IP_ECN",
252 MFF_IP_TTL, "nw_ttl", NULL,
254 MFM_NONE, FWW_NW_TTL,
258 NXM_NX_IP_TTL, "NXM_NX_IP_TTL",
259 NXM_NX_IP_TTL, "NXM_NX_IP_TTL",
261 MFF_IP_FRAG, "ip_frag", NULL,
267 NXM_NX_IP_FRAG, "NXM_NX_IP_FRAG",
268 NXM_NX_IP_FRAG, "NXM_NX_IP_FRAG",
272 MFF_ARP_OP, "arp_op", NULL,
273 MF_FIELD_SIZES(be16),
274 MFM_NONE, FWW_NW_PROTO,
278 NXM_OF_ARP_OP, "NXM_OF_ARP_OP",
279 OXM_OF_ARP_OP, "OXM_OF_ARP_OP",
281 MFF_ARP_SPA, "arp_spa", NULL,
282 MF_FIELD_SIZES(be32),
287 NXM_OF_ARP_SPA, "NXM_OF_ARP_SPA",
288 OXM_OF_ARP_SPA, "OXM_OF_ARP_SPA",
290 MFF_ARP_TPA, "arp_tpa", NULL,
291 MF_FIELD_SIZES(be32),
296 NXM_OF_ARP_TPA, "NXM_OF_ARP_TPA",
297 OXM_OF_ARP_TPA, "OXM_OF_ARP_TPA",
299 MFF_ARP_SHA, "arp_sha", NULL,
301 MFM_NONE, FWW_ARP_SHA,
305 NXM_NX_ARP_SHA, "NXM_NX_ARP_SHA",
306 OXM_OF_ARP_SHA, "OXM_OF_ARP_SHA",
308 MFF_ARP_THA, "arp_tha", NULL,
310 MFM_NONE, FWW_ARP_THA,
314 NXM_NX_ARP_THA, "NXM_NX_ARP_THA",
315 OXM_OF_ARP_THA, "OXM_OF_ARP_THA",
323 MFF_TCP_SRC, "tcp_src", "tp_src",
324 MF_FIELD_SIZES(be16),
329 NXM_OF_TCP_SRC, "NXM_OF_TCP_SRC",
330 OXM_OF_TCP_SRC, "OXM_OF_TCP_SRC",
332 MFF_TCP_DST, "tcp_dst", "tp_dst",
333 MF_FIELD_SIZES(be16),
338 NXM_OF_TCP_DST, "NXM_OF_TCP_DST",
339 OXM_OF_TCP_DST, "OXM_OF_TCP_DST",
343 MFF_UDP_SRC, "udp_src", NULL,
344 MF_FIELD_SIZES(be16),
349 NXM_OF_UDP_SRC, "NXM_OF_UDP_SRC",
350 OXM_OF_UDP_SRC, "OXM_OF_UDP_SRC",
352 MFF_UDP_DST, "udp_dst", NULL,
353 MF_FIELD_SIZES(be16),
358 NXM_OF_UDP_DST, "NXM_OF_UDP_DST",
359 OXM_OF_UDP_DST, "OXM_OF_UDP_DST",
363 MFF_ICMPV4_TYPE, "icmp_type", NULL,
369 NXM_OF_ICMP_TYPE, "NXM_OF_ICMP_TYPE",
370 OXM_OF_ICMPV4_TYPE, "OXM_OF_ICMPV4_TYPE",
372 MFF_ICMPV4_CODE, "icmp_code", NULL,
378 NXM_OF_ICMP_CODE, "NXM_OF_ICMP_CODE",
379 OXM_OF_ICMPV4_CODE, "OXM_OF_ICMPV4_CODE",
383 MFF_ICMPV6_TYPE, "icmpv6_type", NULL,
389 NXM_NX_ICMPV6_TYPE, "NXM_NX_ICMPV6_TYPE",
390 OXM_OF_ICMPV6_TYPE, "OXM_OF_ICMPV6_TYPE",
392 MFF_ICMPV6_CODE, "icmpv6_code", NULL,
398 NXM_NX_ICMPV6_CODE, "NXM_NX_ICMPV6_CODE",
399 OXM_OF_ICMPV6_CODE, "OXM_OF_ICMPV6_CODE",
407 MFF_ND_TARGET, "nd_target", NULL,
408 MF_FIELD_SIZES(ipv6),
413 NXM_NX_ND_TARGET, "NXM_NX_ND_TARGET",
414 OXM_OF_IPV6_ND_TARGET, "OXM_OF_IPV6_ND_TARGET",
416 MFF_ND_SLL, "nd_sll", NULL,
418 MFM_NONE, FWW_ARP_SHA,
422 NXM_NX_ND_SLL, "NXM_NX_ND_SLL",
423 OXM_OF_IPV6_ND_SLL, "OXM_OF_IPV6_ND_SLL",
425 MFF_ND_TLL, "nd_tll", NULL,
427 MFM_NONE, FWW_ARP_THA,
431 NXM_NX_ND_TLL, "NXM_NX_ND_TLL",
432 OXM_OF_IPV6_ND_TLL, "OXM_OF_IPV6_ND_TLL",
436 /* Maps an NXM or OXM header value to an mf_field. */
438 struct hmap_node hmap_node; /* In 'all_fields' hmap. */
439 uint32_t header; /* NXM or OXM header value. */
440 const struct mf_field *mf;
443 /* Contains 'struct nxm_field's. */
444 static struct hmap all_fields = HMAP_INITIALIZER(&all_fields);
446 /* Rate limit for parse errors. These always indicate a bug in an OpenFlow
447 * controller and so there's not much point in showing a lot of them. */
448 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
450 const struct mf_field *mf_from_nxm_header__(uint32_t header);
452 /* Returns the field with the given 'id'. */
453 const struct mf_field *
454 mf_from_id(enum mf_field_id id)
456 assert((unsigned int) id < MFF_N_IDS);
457 return &mf_fields[id];
460 /* Returns the field with the given 'name', or a null pointer if no field has
462 const struct mf_field *
463 mf_from_name(const char *name)
465 static struct shash mf_by_name = SHASH_INITIALIZER(&mf_by_name);
467 if (shash_is_empty(&mf_by_name)) {
468 const struct mf_field *mf;
470 for (mf = mf_fields; mf < &mf_fields[MFF_N_IDS]; mf++) {
471 shash_add_once(&mf_by_name, mf->name, mf);
472 if (mf->extra_name) {
473 shash_add_once(&mf_by_name, mf->extra_name, mf);
478 return shash_find_data(&mf_by_name, name);
482 add_nxm_field(uint32_t header, const struct mf_field *mf)
486 f = xmalloc(sizeof *f);
487 hmap_insert(&all_fields, &f->hmap_node, hash_int(header, 0));
493 nxm_init_add_field(const struct mf_field *mf, uint32_t header)
496 assert(!mf_from_nxm_header__(header));
497 add_nxm_field(header, mf);
498 if (mf->maskable != MFM_NONE) {
499 add_nxm_field(NXM_MAKE_WILD_HEADER(header), mf);
507 const struct mf_field *mf;
509 for (mf = mf_fields; mf < &mf_fields[MFF_N_IDS]; mf++) {
510 nxm_init_add_field(mf, mf->nxm_header);
511 if (mf->oxm_header != mf->nxm_header) {
512 nxm_init_add_field(mf, mf->oxm_header);
517 const struct mf_field *
518 mf_from_nxm_header(uint32_t header)
520 if (hmap_is_empty(&all_fields)) {
523 return mf_from_nxm_header__(header);
526 const struct mf_field *
527 mf_from_nxm_header__(uint32_t header)
529 const struct nxm_field *f;
531 HMAP_FOR_EACH_IN_BUCKET (f, hmap_node, hash_int(header, 0), &all_fields) {
532 if (f->header == header) {
540 /* Returns true if 'wc' wildcards all the bits in field 'mf', false if 'wc'
541 * specifies at least one bit in the field.
543 * The caller is responsible for ensuring that 'wc' corresponds to a flow that
544 * meets 'mf''s prerequisites. */
546 mf_is_all_wild(const struct mf_field *mf, const struct flow_wildcards *wc)
561 assert(mf->fww_bit != 0);
562 return (wc->wildcards & mf->fww_bit) != 0;
565 return !wc->tun_id_mask;
594 return !wc->reg_masks[mf->id - MFF_REG0];
597 return eth_addr_is_zero(wc->dl_src_mask);
599 return eth_addr_is_zero(wc->dl_dst_mask);
602 return !wc->vlan_tci_mask;
604 return !(wc->vlan_tci_mask & htons(VLAN_VID_MASK));
606 return !(wc->vlan_tci_mask & htons(VLAN_PCP_MASK));
609 return !wc->nw_src_mask;
611 return !wc->nw_dst_mask;
614 return ipv6_mask_is_any(&wc->ipv6_src_mask);
616 return ipv6_mask_is_any(&wc->ipv6_dst_mask);
619 return ipv6_mask_is_any(&wc->nd_target_mask);
622 return !(wc->nw_frag_mask & FLOW_NW_FRAG_MASK);
625 return !wc->nw_src_mask;
627 return !wc->nw_dst_mask;
631 case MFF_ICMPV4_TYPE:
632 case MFF_ICMPV6_TYPE:
633 return !wc->tp_src_mask;
636 case MFF_ICMPV4_CODE:
637 case MFF_ICMPV6_CODE:
638 return !wc->tp_dst_mask;
646 /* Initializes 'mask' with the wildcard bit pattern for field 'mf' within 'wc'.
647 * Each bit in 'mask' will be set to 1 if the bit is significant for matching
648 * purposes, or to 0 if it is wildcarded.
650 * The caller is responsible for ensuring that 'wc' corresponds to a flow that
651 * meets 'mf''s prerequisites. */
653 mf_get_mask(const struct mf_field *mf, const struct flow_wildcards *wc,
654 union mf_value *mask)
669 assert(mf->fww_bit != 0);
670 memset(mask, wc->wildcards & mf->fww_bit ? 0x00 : 0xff, mf->n_bytes);
674 mask->be64 = wc->tun_id_mask;
704 mask->be32 = htonl(wc->reg_masks[mf->id - MFF_REG0]);
708 memcpy(mask->mac, wc->dl_dst_mask, ETH_ADDR_LEN);
712 memcpy(mask->mac, wc->dl_src_mask, ETH_ADDR_LEN);
716 mask->be16 = wc->vlan_tci_mask;
719 mask->be16 = wc->vlan_tci_mask & htons(VLAN_VID_MASK);
722 mask->u8 = vlan_tci_to_pcp(wc->vlan_tci_mask);
726 mask->be32 = wc->nw_src_mask;
729 mask->be32 = wc->nw_dst_mask;
733 mask->ipv6 = wc->ipv6_src_mask;
736 mask->ipv6 = wc->ipv6_dst_mask;
740 mask->ipv6 = wc->nd_target_mask;
744 mask->u8 = wc->nw_frag_mask & FLOW_NW_FRAG_MASK;
748 mask->be32 = wc->nw_src_mask;
751 mask->be32 = wc->nw_dst_mask;
756 mask->be16 = wc->tp_src_mask;
760 mask->be16 = wc->tp_dst_mask;
763 case MFF_ICMPV4_TYPE:
764 case MFF_ICMPV6_TYPE:
765 mask->u8 = ntohs(wc->tp_src_mask);
767 case MFF_ICMPV4_CODE:
768 case MFF_ICMPV6_CODE:
769 mask->u8 = ntohs(wc->tp_dst_mask);
778 /* Tests whether 'mask' is a valid wildcard bit pattern for 'mf'. Returns true
779 * if the mask is valid, false otherwise. */
781 mf_is_mask_valid(const struct mf_field *mf, const union mf_value *mask)
783 switch (mf->maskable) {
785 return (is_all_zeros((const uint8_t *) mask, mf->n_bytes) ||
786 is_all_ones((const uint8_t *) mask, mf->n_bytes));
796 is_ip_any(const struct flow *flow)
798 return (flow->dl_type == htons(ETH_TYPE_IP) ||
799 flow->dl_type == htons(ETH_TYPE_IPV6));
803 is_icmpv4(const struct flow *flow)
805 return (flow->dl_type == htons(ETH_TYPE_IP)
806 && flow->nw_proto == IPPROTO_ICMP);
810 is_icmpv6(const struct flow *flow)
812 return (flow->dl_type == htons(ETH_TYPE_IPV6)
813 && flow->nw_proto == IPPROTO_ICMPV6);
816 /* Returns true if 'flow' meets the prerequisites for 'mf', false otherwise. */
818 mf_are_prereqs_ok(const struct mf_field *mf, const struct flow *flow)
820 switch (mf->prereqs) {
825 return flow->dl_type == htons(ETH_TYPE_ARP);
827 return flow->dl_type == htons(ETH_TYPE_IP);
829 return flow->dl_type == htons(ETH_TYPE_IPV6);
831 return is_ip_any(flow);
834 return is_ip_any(flow) && flow->nw_proto == IPPROTO_TCP;
836 return is_ip_any(flow) && flow->nw_proto == IPPROTO_UDP;
838 return is_icmpv4(flow);
840 return is_icmpv6(flow);
843 return (is_icmpv6(flow)
844 && flow->tp_dst == htons(0)
845 && (flow->tp_src == htons(ND_NEIGHBOR_SOLICIT) ||
846 flow->tp_src == htons(ND_NEIGHBOR_ADVERT)));
848 return (is_icmpv6(flow)
849 && flow->tp_dst == htons(0)
850 && (flow->tp_src == htons(ND_NEIGHBOR_SOLICIT)));
852 return (is_icmpv6(flow)
853 && flow->tp_dst == htons(0)
854 && (flow->tp_src == htons(ND_NEIGHBOR_ADVERT)));
860 /* Returns true if 'value' may be a valid value *as part of a masked match*,
863 * A value is not rejected just because it is not valid for the field in
864 * question, but only if it doesn't make sense to test the bits in question at
865 * all. For example, the MFF_VLAN_TCI field will never have a nonzero value
866 * without the VLAN_CFI bit being set, but we can't reject those values because
867 * it is still legitimate to test just for those bits (see the documentation
868 * for NXM_OF_VLAN_TCI in nicira-ext.h). On the other hand, there is never a
869 * reason to set the low bit of MFF_IP_DSCP to 1, so we reject that. */
871 mf_is_value_valid(const struct mf_field *mf, const union mf_value *value)
921 case MFF_ICMPV4_TYPE:
922 case MFF_ICMPV4_CODE:
923 case MFF_ICMPV6_TYPE:
924 case MFF_ICMPV6_CODE:
931 return !(value->u8 & ~IP_DSCP_MASK);
933 return !(value->u8 & ~IP_ECN_MASK);
935 return !(value->u8 & ~FLOW_NW_FRAG_MASK);
938 return !(value->be16 & htons(0xff00));
941 return !(value->be16 & htons(VLAN_CFI | VLAN_PCP_MASK));
944 return !(value->u8 & ~(VLAN_PCP_MASK >> VLAN_PCP_SHIFT));
947 return !(value->be32 & ~htonl(IPV6_LABEL_MASK));
955 /* Copies the value of field 'mf' from 'flow' into 'value'. The caller is
956 * responsible for ensuring that 'flow' meets 'mf''s prerequisites. */
958 mf_get_value(const struct mf_field *mf, const struct flow *flow,
959 union mf_value *value)
963 value->be64 = flow->tun_id;
967 value->be16 = htons(flow->in_port);
997 value->be32 = htonl(flow->regs[mf->id - MFF_REG0]);
1001 memcpy(value->mac, flow->dl_src, ETH_ADDR_LEN);
1005 memcpy(value->mac, flow->dl_dst, ETH_ADDR_LEN);
1009 value->be16 = flow->dl_type;
1013 value->be16 = flow->vlan_tci;
1017 value->be16 = flow->vlan_tci & htons(VLAN_VID_MASK);
1021 value->u8 = vlan_tci_to_pcp(flow->vlan_tci);
1025 value->be32 = flow->nw_src;
1029 value->be32 = flow->nw_dst;
1033 value->ipv6 = flow->ipv6_src;
1037 value->ipv6 = flow->ipv6_dst;
1040 case MFF_IPV6_LABEL:
1041 value->be32 = flow->ipv6_label;
1045 value->u8 = flow->nw_proto;
1049 value->u8 = flow->nw_tos & IP_DSCP_MASK;
1053 value->u8 = flow->nw_tos & IP_ECN_MASK;
1057 value->u8 = flow->nw_ttl;
1061 value->u8 = flow->nw_frag;
1065 value->be16 = htons(flow->nw_proto);
1069 value->be32 = flow->nw_src;
1073 value->be32 = flow->nw_dst;
1078 memcpy(value->mac, flow->arp_sha, ETH_ADDR_LEN);
1083 memcpy(value->mac, flow->arp_tha, ETH_ADDR_LEN);
1087 value->be16 = flow->tp_src;
1091 value->be16 = flow->tp_dst;
1095 value->be16 = flow->tp_src;
1099 value->be16 = flow->tp_dst;
1102 case MFF_ICMPV4_TYPE:
1103 case MFF_ICMPV6_TYPE:
1104 value->u8 = ntohs(flow->tp_src);
1107 case MFF_ICMPV4_CODE:
1108 case MFF_ICMPV6_CODE:
1109 value->u8 = ntohs(flow->tp_dst);
1113 value->ipv6 = flow->nd_target;
1122 /* Makes 'rule' match field 'mf' exactly, with the value matched taken from
1123 * 'value'. The caller is responsible for ensuring that 'rule' meets 'mf''s
1126 mf_set_value(const struct mf_field *mf,
1127 const union mf_value *value, struct cls_rule *rule)
1131 cls_rule_set_tun_id(rule, value->be64);
1135 cls_rule_set_in_port(rule, ntohs(value->be16));
1166 cls_rule_set_reg(rule, mf->id - MFF_REG0, ntohl(value->be32));
1171 cls_rule_set_dl_src(rule, value->mac);
1175 cls_rule_set_dl_dst(rule, value->mac);
1179 cls_rule_set_dl_type(rule, value->be16);
1183 cls_rule_set_dl_tci(rule, value->be16);
1187 cls_rule_set_dl_vlan(rule, value->be16);
1191 cls_rule_set_dl_vlan_pcp(rule, value->u8);
1195 cls_rule_set_nw_src(rule, value->be32);
1199 cls_rule_set_nw_dst(rule, value->be32);
1203 cls_rule_set_ipv6_src(rule, &value->ipv6);
1207 cls_rule_set_ipv6_dst(rule, &value->ipv6);
1210 case MFF_IPV6_LABEL:
1211 cls_rule_set_ipv6_label(rule, value->be32);
1215 cls_rule_set_nw_proto(rule, value->u8);
1219 cls_rule_set_nw_dscp(rule, value->u8);
1223 cls_rule_set_nw_ecn(rule, value->u8);
1227 cls_rule_set_nw_ttl(rule, value->u8);
1231 cls_rule_set_nw_frag(rule, value->u8);
1235 cls_rule_set_nw_proto(rule, ntohs(value->be16));
1239 cls_rule_set_nw_src(rule, value->be32);
1243 cls_rule_set_nw_dst(rule, value->be32);
1248 cls_rule_set_arp_sha(rule, value->mac);
1253 cls_rule_set_arp_tha(rule, value->mac);
1257 cls_rule_set_tp_src(rule, value->be16);
1261 cls_rule_set_tp_dst(rule, value->be16);
1265 cls_rule_set_tp_src(rule, value->be16);
1269 cls_rule_set_tp_dst(rule, value->be16);
1272 case MFF_ICMPV4_TYPE:
1273 case MFF_ICMPV6_TYPE:
1274 cls_rule_set_icmp_type(rule, value->u8);
1277 case MFF_ICMPV4_CODE:
1278 case MFF_ICMPV6_CODE:
1279 cls_rule_set_icmp_code(rule, value->u8);
1283 cls_rule_set_nd_target(rule, &value->ipv6);
1292 /* Makes 'rule' match field 'mf' exactly, with the value matched taken from
1293 * 'value'. The caller is responsible for ensuring that 'rule' meets 'mf''s
1296 mf_set_flow_value(const struct mf_field *mf,
1297 const union mf_value *value, struct flow *flow)
1301 flow->tun_id = value->be64;
1305 flow->in_port = ntohs(value->be16);
1336 flow->regs[mf->id - MFF_REG0] = ntohl(value->be32);
1341 memcpy(flow->dl_src, value->mac, ETH_ADDR_LEN);
1345 memcpy(flow->dl_dst, value->mac, ETH_ADDR_LEN);
1349 flow->dl_type = value->be16;
1353 flow->vlan_tci = value->be16;
1357 flow_set_vlan_vid(flow, value->be16);
1361 flow_set_vlan_pcp(flow, value->u8);
1365 flow->nw_src = value->be32;
1369 flow->nw_dst = value->be32;
1373 flow->ipv6_src = value->ipv6;
1377 flow->ipv6_dst = value->ipv6;
1380 case MFF_IPV6_LABEL:
1381 flow->ipv6_label = value->be32 & ~htonl(IPV6_LABEL_MASK);
1385 flow->nw_proto = value->u8;
1389 flow->nw_tos &= ~IP_DSCP_MASK;
1390 flow->nw_tos |= value->u8 & IP_DSCP_MASK;
1394 flow->nw_tos &= ~IP_ECN_MASK;
1395 flow->nw_tos |= value->u8 & IP_ECN_MASK;
1399 flow->nw_ttl = value->u8;
1403 flow->nw_frag &= value->u8;
1407 flow->nw_proto = ntohs(value->be16);
1411 flow->nw_src = value->be32;
1415 flow->nw_dst = value->be32;
1420 memcpy(flow->arp_sha, value->mac, ETH_ADDR_LEN);
1425 memcpy(flow->arp_tha, value->mac, ETH_ADDR_LEN);
1430 flow->tp_src = value->be16;
1435 flow->tp_dst = value->be16;
1438 case MFF_ICMPV4_TYPE:
1439 case MFF_ICMPV6_TYPE:
1440 flow->tp_src = htons(value->u8);
1443 case MFF_ICMPV4_CODE:
1444 case MFF_ICMPV6_CODE:
1445 flow->tp_dst = htons(value->u8);
1449 flow->nd_target = value->ipv6;
1458 /* Returns true if 'mf' has a zero value in 'flow', false if it is nonzero.
1460 * The caller is responsible for ensuring that 'flow' meets 'mf''s
1463 mf_is_zero(const struct mf_field *mf, const struct flow *flow)
1465 union mf_value value;
1467 mf_get_value(mf, flow, &value);
1468 return is_all_zeros((const uint8_t *) &value, mf->n_bytes);
1471 /* Makes 'rule' wildcard field 'mf'.
1473 * The caller is responsible for ensuring that 'rule' meets 'mf''s
1476 mf_set_wild(const struct mf_field *mf, struct cls_rule *rule)
1480 cls_rule_set_tun_id_masked(rule, htonll(0), htonll(0));
1484 rule->wc.wildcards |= FWW_IN_PORT;
1485 rule->flow.in_port = 0;
1490 cls_rule_set_reg_masked(rule, 0, 0, 0);
1495 cls_rule_set_reg_masked(rule, 1, 0, 0);
1500 cls_rule_set_reg_masked(rule, 2, 0, 0);
1505 cls_rule_set_reg_masked(rule, 3, 0, 0);
1510 cls_rule_set_reg_masked(rule, 4, 0, 0);
1515 cls_rule_set_reg_masked(rule, 5, 0, 0);
1520 cls_rule_set_reg_masked(rule, 6, 0, 0);
1525 cls_rule_set_reg_masked(rule, 7, 0, 0);
1533 memset(rule->flow.dl_src, 0, ETH_ADDR_LEN);
1534 memset(rule->wc.dl_src_mask, 0, ETH_ADDR_LEN);
1538 memset(rule->flow.dl_dst, 0, ETH_ADDR_LEN);
1539 memset(rule->wc.dl_dst_mask, 0, ETH_ADDR_LEN);
1543 rule->wc.wildcards |= FWW_DL_TYPE;
1544 rule->flow.dl_type = htons(0);
1548 cls_rule_set_dl_tci_masked(rule, htons(0), htons(0));
1552 cls_rule_set_any_vid(rule);
1556 cls_rule_set_any_pcp(rule);
1561 cls_rule_set_nw_src_masked(rule, htonl(0), htonl(0));
1566 cls_rule_set_nw_dst_masked(rule, htonl(0), htonl(0));
1570 memset(&rule->wc.ipv6_src_mask, 0, sizeof rule->wc.ipv6_src_mask);
1571 memset(&rule->flow.ipv6_src, 0, sizeof rule->flow.ipv6_src);
1575 memset(&rule->wc.ipv6_dst_mask, 0, sizeof rule->wc.ipv6_dst_mask);
1576 memset(&rule->flow.ipv6_dst, 0, sizeof rule->flow.ipv6_dst);
1579 case MFF_IPV6_LABEL:
1580 rule->wc.wildcards |= FWW_IPV6_LABEL;
1581 rule->flow.ipv6_label = 0;
1585 rule->wc.wildcards |= FWW_NW_PROTO;
1586 rule->flow.nw_proto = 0;
1590 rule->wc.wildcards |= FWW_NW_DSCP;
1591 rule->flow.nw_tos &= ~IP_DSCP_MASK;
1595 rule->wc.wildcards |= FWW_NW_ECN;
1596 rule->flow.nw_tos &= ~IP_ECN_MASK;
1600 rule->wc.wildcards |= FWW_NW_TTL;
1601 rule->flow.nw_ttl = 0;
1605 rule->wc.nw_frag_mask |= FLOW_NW_FRAG_MASK;
1606 rule->flow.nw_frag &= ~FLOW_NW_FRAG_MASK;
1610 rule->wc.wildcards |= FWW_NW_PROTO;
1611 rule->flow.nw_proto = 0;
1616 rule->wc.wildcards |= FWW_ARP_SHA;
1617 memset(rule->flow.arp_sha, 0, sizeof rule->flow.arp_sha);
1622 rule->wc.wildcards |= FWW_ARP_THA;
1623 memset(rule->flow.arp_tha, 0, sizeof rule->flow.arp_tha);
1628 case MFF_ICMPV4_TYPE:
1629 case MFF_ICMPV6_TYPE:
1630 rule->wc.tp_src_mask = htons(0);
1631 rule->flow.tp_src = htons(0);
1636 case MFF_ICMPV4_CODE:
1637 case MFF_ICMPV6_CODE:
1638 rule->wc.tp_dst_mask = htons(0);
1639 rule->flow.tp_dst = htons(0);
1643 memset(&rule->wc.nd_target_mask, 0, sizeof rule->wc.nd_target_mask);
1644 memset(&rule->flow.nd_target, 0, sizeof rule->flow.nd_target);
1653 /* Makes 'rule' match field 'mf' with the specified 'value' and 'mask'.
1654 * 'value' specifies a value to match and 'mask' specifies a wildcard pattern,
1655 * with a 1-bit indicating that the corresponding value bit must match and a
1656 * 0-bit indicating a don't-care.
1658 * If 'mask' is NULL or points to all-1-bits, then this call is equivalent to
1659 * mf_set_value(mf, value, rule). If 'mask' points to all-0-bits, then this
1660 * call is equivalent to mf_set_wild(mf, rule).
1662 * 'mask' must be a valid mask for 'mf' (see mf_is_mask_valid()). The caller
1663 * is responsible for ensuring that 'rule' meets 'mf''s prerequisites. */
1665 mf_set(const struct mf_field *mf,
1666 const union mf_value *value, const union mf_value *mask,
1667 struct cls_rule *rule)
1669 if (!mask || is_all_ones((const uint8_t *) mask, mf->n_bytes)) {
1670 mf_set_value(mf, value, rule);
1672 } else if (is_all_zeros((const uint8_t *) mask, mf->n_bytes)) {
1673 mf_set_wild(mf, rule);
1682 case MFF_IPV6_LABEL:
1690 case MFF_ICMPV4_TYPE:
1691 case MFF_ICMPV4_CODE:
1692 case MFF_ICMPV6_TYPE:
1693 case MFF_ICMPV6_CODE:
1699 cls_rule_set_tun_id_masked(rule, value->be64, mask->be64);
1729 cls_rule_set_reg_masked(rule, mf->id - MFF_REG0,
1730 ntohl(value->be32), ntohl(mask->be32));
1734 cls_rule_set_dl_dst_masked(rule, value->mac, mask->mac);
1738 cls_rule_set_dl_src_masked(rule, value->mac, mask->mac);
1742 cls_rule_set_dl_tci_masked(rule, value->be16, mask->be16);
1746 cls_rule_set_nw_src_masked(rule, value->be32, mask->be32);
1750 cls_rule_set_nw_dst_masked(rule, value->be32, mask->be32);
1754 cls_rule_set_ipv6_src_masked(rule, &value->ipv6, &mask->ipv6);
1758 cls_rule_set_ipv6_dst_masked(rule, &value->ipv6, &mask->ipv6);
1762 cls_rule_set_nd_target_masked(rule, &value->ipv6, &mask->ipv6);
1766 cls_rule_set_nw_frag_masked(rule, value->u8, mask->u8);
1770 cls_rule_set_nw_src_masked(rule, value->be32, mask->be32);
1774 cls_rule_set_nw_dst_masked(rule, value->be32, mask->be32);
1779 cls_rule_set_tp_src_masked(rule, value->be16, mask->be16);
1784 cls_rule_set_tp_dst_masked(rule, value->be16, mask->be16);
1794 mf_check__(const struct mf_subfield *sf, const struct flow *flow,
1798 VLOG_WARN_RL(&rl, "unknown %s field", type);
1799 } else if (!sf->n_bits) {
1800 VLOG_WARN_RL(&rl, "zero bit %s field %s", type, sf->field->name);
1801 } else if (sf->ofs >= sf->field->n_bits) {
1802 VLOG_WARN_RL(&rl, "bit offset %d exceeds %d-bit width of %s field %s",
1803 sf->ofs, sf->field->n_bits, type, sf->field->name);
1804 } else if (sf->ofs + sf->n_bits > sf->field->n_bits) {
1805 VLOG_WARN_RL(&rl, "bit offset %d and width %d exceeds %d-bit width "
1806 "of %s field %s", sf->ofs, sf->n_bits,
1807 sf->field->n_bits, type, sf->field->name);
1808 } else if (flow && !mf_are_prereqs_ok(sf->field, flow)) {
1809 VLOG_WARN_RL(&rl, "%s field %s lacks correct prerequisites",
1810 type, sf->field->name);
1815 return OFPERR_OFPBAC_BAD_ARGUMENT;
1818 /* Checks whether 'sf' is valid for reading a subfield out of 'flow'. Returns
1819 * 0 if so, otherwise an OpenFlow error code (e.g. as returned by
1822 mf_check_src(const struct mf_subfield *sf, const struct flow *flow)
1824 return mf_check__(sf, flow, "source");
1827 /* Checks whether 'sf' is valid for writing a subfield into 'flow'. Returns 0
1828 * if so, otherwise an OpenFlow error code (e.g. as returned by
1831 mf_check_dst(const struct mf_subfield *sf, const struct flow *flow)
1833 int error = mf_check__(sf, flow, "destination");
1834 if (!error && !sf->field->writable) {
1835 VLOG_WARN_RL(&rl, "destination field %s is not writable",
1837 return OFPERR_OFPBAC_BAD_ARGUMENT;
1842 /* Copies the value and wildcard bit pattern for 'mf' from 'rule' into the
1843 * 'value' and 'mask', respectively. */
1845 mf_get(const struct mf_field *mf, const struct cls_rule *rule,
1846 union mf_value *value, union mf_value *mask)
1848 mf_get_value(mf, &rule->flow, value);
1849 mf_get_mask(mf, &rule->wc, mask);
1852 /* Assigns a random value for field 'mf' to 'value'. */
1854 mf_random_value(const struct mf_field *mf, union mf_value *value)
1856 random_bytes(value, mf->n_bytes);
1906 case MFF_ICMPV4_TYPE:
1907 case MFF_ICMPV4_CODE:
1908 case MFF_ICMPV6_TYPE:
1909 case MFF_ICMPV6_CODE:
1915 case MFF_IPV6_LABEL:
1916 value->be32 &= ~htonl(IPV6_LABEL_MASK);
1920 value->u8 &= IP_DSCP_MASK;
1924 value->u8 &= IP_ECN_MASK;
1928 value->u8 &= FLOW_NW_FRAG_MASK;
1932 value->be16 &= htons(0xff);
1936 value->be16 &= htons(VLAN_VID_MASK);
1950 mf_from_integer_string(const struct mf_field *mf, const char *s,
1951 uint8_t *valuep, uint8_t *maskp)
1953 unsigned long long int integer, mask;
1958 integer = strtoull(s, &tail, 0);
1959 if (errno || (*tail != '\0' && *tail != '/')) {
1964 mask = strtoull(tail + 1, &tail, 0);
1965 if (errno || *tail != '\0') {
1972 for (i = mf->n_bytes - 1; i >= 0; i--) {
1973 valuep[i] = integer;
1979 return xasprintf("%s: value too large for %u-byte field %s",
1980 s, mf->n_bytes, mf->name);
1985 return xasprintf("%s: bad syntax for %s", s, mf->name);
1989 mf_from_ethernet_string(const struct mf_field *mf, const char *s,
1990 uint8_t mac[ETH_ADDR_LEN],
1991 uint8_t mask[ETH_ADDR_LEN])
1993 assert(mf->n_bytes == ETH_ADDR_LEN);
1995 switch (sscanf(s, ETH_ADDR_SCAN_FMT"/"ETH_ADDR_SCAN_FMT,
1996 ETH_ADDR_SCAN_ARGS(mac), ETH_ADDR_SCAN_ARGS(mask))){
1997 case ETH_ADDR_SCAN_COUNT * 2:
2000 case ETH_ADDR_SCAN_COUNT:
2001 memset(mask, 0xff, ETH_ADDR_LEN);
2005 return xasprintf("%s: invalid Ethernet address", s);
2010 mf_from_ipv4_string(const struct mf_field *mf, const char *s,
2011 ovs_be32 *ip, ovs_be32 *mask)
2015 assert(mf->n_bytes == sizeof *ip);
2017 if (sscanf(s, IP_SCAN_FMT"/"IP_SCAN_FMT,
2018 IP_SCAN_ARGS(ip), IP_SCAN_ARGS(mask)) == IP_SCAN_COUNT * 2) {
2020 } else if (sscanf(s, IP_SCAN_FMT"/%d",
2021 IP_SCAN_ARGS(ip), &prefix) == IP_SCAN_COUNT + 1) {
2022 if (prefix <= 0 || prefix > 32) {
2023 return xasprintf("%s: network prefix bits not between 1 and "
2025 } else if (prefix == 32) {
2026 *mask = htonl(UINT32_MAX);
2028 *mask = htonl(((1u << prefix) - 1) << (32 - prefix));
2030 } else if (sscanf(s, IP_SCAN_FMT, IP_SCAN_ARGS(ip)) == IP_SCAN_COUNT) {
2031 *mask = htonl(UINT32_MAX);
2033 return xasprintf("%s: invalid IP address", s);
2039 mf_from_ipv6_string(const struct mf_field *mf, const char *s,
2040 struct in6_addr *value, struct in6_addr *mask)
2042 char *str = xstrdup(s);
2043 char *save_ptr = NULL;
2044 const char *name, *netmask;
2047 assert(mf->n_bytes == sizeof *value);
2049 name = strtok_r(str, "/", &save_ptr);
2050 retval = name ? lookup_ipv6(name, value) : EINVAL;
2054 err = xasprintf("%s: could not convert to IPv6 address", str);
2060 netmask = strtok_r(NULL, "/", &save_ptr);
2062 if (inet_pton(AF_INET6, netmask, mask) != 1) {
2063 int prefix = atoi(netmask);
2064 if (prefix <= 0 || prefix > 128) {
2066 return xasprintf("%s: prefix bits not between 1 and 128", s);
2068 *mask = ipv6_create_mask(prefix);
2072 *mask = in6addr_exact;
2080 mf_from_ofp_port_string(const struct mf_field *mf, const char *s,
2081 ovs_be16 *valuep, ovs_be16 *maskp)
2085 assert(mf->n_bytes == sizeof(ovs_be16));
2086 if (ofputil_port_from_string(s, &port)) {
2087 *valuep = htons(port);
2088 *maskp = htons(UINT16_MAX);
2091 return mf_from_integer_string(mf, s,
2092 (uint8_t *) valuep, (uint8_t *) maskp);
2096 struct frag_handling {
2102 static const struct frag_handling all_frags[] = {
2103 #define A FLOW_NW_FRAG_ANY
2104 #define L FLOW_NW_FRAG_LATER
2105 /* name mask value */
2108 { "first", A|L, A },
2109 { "later", A|L, A|L },
2114 { "not_later", L, 0 },
2121 mf_from_frag_string(const char *s, uint8_t *valuep, uint8_t *maskp)
2123 const struct frag_handling *h;
2125 for (h = all_frags; h < &all_frags[ARRAY_SIZE(all_frags)]; h++) {
2126 if (!strcasecmp(s, h->name)) {
2127 /* We force the upper bits of the mask on to make mf_parse_value()
2128 * happy (otherwise it will never think it's an exact match.) */
2129 *maskp = h->mask | ~FLOW_NW_FRAG_MASK;
2135 return xasprintf("%s: unknown fragment type (valid types are \"no\", "
2136 "\"yes\", \"first\", \"later\", \"not_first\"", s);
2139 /* Parses 's', a string value for field 'mf', into 'value' and 'mask'. Returns
2140 * NULL if successful, otherwise a malloc()'d string describing the error. */
2142 mf_parse(const struct mf_field *mf, const char *s,
2143 union mf_value *value, union mf_value *mask)
2145 if (!strcasecmp(s, "any") || !strcmp(s, "*")) {
2146 memset(value, 0, mf->n_bytes);
2147 memset(mask, 0, mf->n_bytes);
2151 switch (mf->string) {
2153 case MFS_HEXADECIMAL:
2154 return mf_from_integer_string(mf, s,
2155 (uint8_t *) value, (uint8_t *) mask);
2158 return mf_from_ethernet_string(mf, s, value->mac, mask->mac);
2161 return mf_from_ipv4_string(mf, s, &value->be32, &mask->be32);
2164 return mf_from_ipv6_string(mf, s, &value->ipv6, &mask->ipv6);
2167 return mf_from_ofp_port_string(mf, s, &value->be16, &mask->be16);
2170 return mf_from_frag_string(s, &value->u8, &mask->u8);
2175 /* Parses 's', a string value for field 'mf', into 'value'. Returns NULL if
2176 * successful, otherwise a malloc()'d string describing the error. */
2178 mf_parse_value(const struct mf_field *mf, const char *s, union mf_value *value)
2180 union mf_value mask;
2183 error = mf_parse(mf, s, value, &mask);
2188 if (!is_all_ones((const uint8_t *) &mask, mf->n_bytes)) {
2189 return xasprintf("%s: wildcards not allowed here", s);
2195 mf_format_integer_string(const struct mf_field *mf, const uint8_t *valuep,
2196 const uint8_t *maskp, struct ds *s)
2198 unsigned long long int integer;
2201 assert(mf->n_bytes <= 8);
2204 for (i = 0; i < mf->n_bytes; i++) {
2205 integer = (integer << 8) | valuep[i];
2207 if (mf->string == MFS_HEXADECIMAL) {
2208 ds_put_format(s, "%#llx", integer);
2210 ds_put_format(s, "%lld", integer);
2214 unsigned long long int mask;
2217 for (i = 0; i < mf->n_bytes; i++) {
2218 mask = (mask << 8) | maskp[i];
2221 /* I guess we could write the mask in decimal for MFS_DECIMAL but I'm
2222 * not sure that that a bit-mask written in decimal is ever easier to
2223 * understand than the same bit-mask written in hexadecimal. */
2224 ds_put_format(s, "/%#llx", mask);
2229 mf_format_frag_string(const uint8_t *valuep, const uint8_t *maskp,
2232 const struct frag_handling *h;
2233 uint8_t value = *valuep;
2234 uint8_t mask = *maskp;
2237 mask &= FLOW_NW_FRAG_MASK;
2239 for (h = all_frags; h < &all_frags[ARRAY_SIZE(all_frags)]; h++) {
2240 if (value == h->value && mask == h->mask) {
2241 ds_put_cstr(s, h->name);
2245 ds_put_cstr(s, "<error>");
2248 /* Appends to 's' a string representation of field 'mf' whose value is in
2249 * 'value' and 'mask'. 'mask' may be NULL to indicate an exact match. */
2251 mf_format(const struct mf_field *mf,
2252 const union mf_value *value, const union mf_value *mask,
2256 if (is_all_zeros((const uint8_t *) mask, mf->n_bytes)) {
2257 ds_put_cstr(s, "ANY");
2259 } else if (is_all_ones((const uint8_t *) mask, mf->n_bytes)) {
2264 switch (mf->string) {
2267 ofputil_format_port(ntohs(value->be16), s);
2272 case MFS_HEXADECIMAL:
2273 mf_format_integer_string(mf, (uint8_t *) value, (uint8_t *) mask, s);
2277 eth_format_masked(value->mac, mask->mac, s);
2281 ip_format_masked(value->be32, mask ? mask->be32 : htonl(UINT32_MAX),
2286 print_ipv6_masked(s, &value->ipv6, mask ? &mask->ipv6 : NULL);
2290 mf_format_frag_string(&value->u8, &mask->u8, s);
2298 /* Makes subfield 'sf' within 'rule' exactly match the 'sf->n_bits'
2299 * least-significant bits in 'x'.
2301 * See mf_set_subfield() for an example.
2303 * The difference between this function and mf_set_subfield() is that the
2304 * latter function can only handle subfields up to 64 bits wide, whereas this
2305 * one handles the general case. On the other hand, mf_set_subfield() is
2306 * arguably easier to use. */
2308 mf_write_subfield(const struct mf_subfield *sf, const union mf_subvalue *x,
2309 struct cls_rule *rule)
2311 const struct mf_field *field = sf->field;
2312 union mf_value value, mask;
2314 mf_get(field, rule, &value, &mask);
2315 bitwise_copy(x, sizeof *x, 0, &value, field->n_bytes, sf->ofs, sf->n_bits);
2316 bitwise_one ( &mask, field->n_bytes, sf->ofs, sf->n_bits);
2317 mf_set(field, &value, &mask, rule);
2320 /* Makes subfield 'sf' within 'rule' exactly match the 'sf->n_bits'
2321 * least-significant bits of 'x'.
2323 * Example: suppose that 'sf->field' is originally the following 2-byte field
2326 * value == 0xe00a == 2#1110000000001010
2327 * mask == 0xfc3f == 2#1111110000111111
2329 * The call mf_set_subfield(sf, 0x55, 8, 7, rule), where sf->ofs == 8 and
2330 * sf->n_bits == 7 would have the following effect (note that 0x55 is
2333 * value == 0xd50a == 2#1101010100001010
2334 * mask == 0xff3f == 2#1111111100111111
2335 * ^^^^^^^ affected bits
2337 * The caller is responsible for ensuring that the result will be a valid
2338 * wildcard pattern for 'sf->field'. The caller is responsible for ensuring
2339 * that 'rule' meets 'sf->field''s prerequisites. */
2341 mf_set_subfield(const struct mf_subfield *sf, uint64_t x,
2342 struct cls_rule *rule)
2344 const struct mf_field *field = sf->field;
2345 unsigned int n_bits = sf->n_bits;
2346 unsigned int ofs = sf->ofs;
2348 if (ofs == 0 && field->n_bytes * 8 == n_bits) {
2349 union mf_value value;
2352 for (i = field->n_bytes - 1; i >= 0; i--) {
2353 ((uint8_t *) &value)[i] = x;
2356 mf_set_value(field, &value, rule);
2358 union mf_value value, mask;
2359 uint8_t *vp = (uint8_t *) &value;
2360 uint8_t *mp = (uint8_t *) &mask;
2362 mf_get(field, rule, &value, &mask);
2363 bitwise_put(x, vp, field->n_bytes, ofs, n_bits);
2364 bitwise_put(UINT64_MAX, mp, field->n_bytes, ofs, n_bits);
2365 mf_set(field, &value, &mask, rule);
2369 /* Similar to mf_set_subfield() but modifies only a flow, not a cls_rule. */
2371 mf_set_subfield_value(const struct mf_subfield *sf, uint64_t x,
2374 const struct mf_field *field = sf->field;
2375 unsigned int n_bits = sf->n_bits;
2376 unsigned int ofs = sf->ofs;
2377 union mf_value value;
2379 if (ofs == 0 && field->n_bytes * 8 == n_bits) {
2382 for (i = field->n_bytes - 1; i >= 0; i--) {
2383 ((uint8_t *) &value)[i] = x;
2386 mf_set_flow_value(field, &value, flow);
2388 mf_get_value(field, flow, &value);
2389 bitwise_put(x, &value, field->n_bytes, ofs, n_bits);
2390 mf_set_flow_value(field, &value, flow);
2394 /* Initializes 'x' to the value of 'sf' within 'flow'. 'sf' must be valid for
2395 * reading 'flow', e.g. as checked by mf_check_src(). */
2397 mf_read_subfield(const struct mf_subfield *sf, const struct flow *flow,
2398 union mf_subvalue *x)
2400 union mf_value value;
2402 mf_get_value(sf->field, flow, &value);
2404 memset(x, 0, sizeof *x);
2405 bitwise_copy(&value, sf->field->n_bytes, sf->ofs,
2410 /* Returns the value of 'sf' within 'flow'. 'sf' must be valid for reading
2411 * 'flow', e.g. as checked by mf_check_src() and sf->n_bits must be 64 or
2414 mf_get_subfield(const struct mf_subfield *sf, const struct flow *flow)
2416 union mf_value value;
2418 mf_get_value(sf->field, flow, &value);
2419 return bitwise_get(&value, sf->field->n_bytes, sf->ofs, sf->n_bits);
2422 /* Formats 'sf' into 's' in a format normally acceptable to
2423 * mf_parse_subfield(). (It won't be acceptable if sf->field is NULL or if
2424 * sf->field has no NXM name.) */
2426 mf_format_subfield(const struct mf_subfield *sf, struct ds *s)
2429 ds_put_cstr(s, "<unknown>");
2430 } else if (sf->field->nxm_name) {
2431 ds_put_cstr(s, sf->field->nxm_name);
2432 } else if (sf->field->nxm_header) {
2433 uint32_t header = sf->field->nxm_header;
2434 ds_put_format(s, "%d:%d", NXM_VENDOR(header), NXM_FIELD(header));
2436 ds_put_cstr(s, sf->field->name);
2439 if (sf->field && sf->ofs == 0 && sf->n_bits == sf->field->n_bits) {
2440 ds_put_cstr(s, "[]");
2441 } else if (sf->n_bits == 1) {
2442 ds_put_format(s, "[%d]", sf->ofs);
2444 ds_put_format(s, "[%d..%d]", sf->ofs, sf->ofs + sf->n_bits - 1);
2448 static const struct mf_field *
2449 mf_parse_subfield_name(const char *name, int name_len, bool *wild)
2453 *wild = name_len > 2 && !memcmp(&name[name_len - 2], "_W", 2);
2458 for (i = 0; i < MFF_N_IDS; i++) {
2459 const struct mf_field *mf = mf_from_id(i);
2462 && !strncmp(mf->nxm_name, name, name_len)
2463 && mf->nxm_name[name_len] == '\0') {
2467 && !strncmp(mf->oxm_name, name, name_len)
2468 && mf->oxm_name[name_len] == '\0') {
2476 /* Parses a subfield from the beginning of '*sp' into 'sf'. If successful,
2477 * returns NULL and advances '*sp' to the first byte following the parsed
2478 * string. On failure, returns a malloc()'d error message, does not modify
2479 * '*sp', and does not properly initialize 'sf'.
2481 * The syntax parsed from '*sp' takes the form "header[start..end]" where
2482 * 'header' is the name of an NXM field and 'start' and 'end' are (inclusive)
2483 * bit indexes. "..end" may be omitted to indicate a single bit. "start..end"
2484 * may both be omitted (the [] are still required) to indicate an entire
2487 mf_parse_subfield__(struct mf_subfield *sf, const char **sp)
2489 const struct mf_field *field;
2498 name_len = strcspn(s, "[");
2499 if (s[name_len] != '[') {
2500 return xasprintf("%s: missing [ looking for field name", *sp);
2503 field = mf_parse_subfield_name(name, name_len, &wild);
2505 return xasprintf("%s: unknown field `%.*s'", *sp, name_len, s);
2509 if (sscanf(s, "[%d..%d]", &start, &end) == 2) {
2510 /* Nothing to do. */
2511 } else if (sscanf(s, "[%d]", &start) == 1) {
2513 } else if (!strncmp(s, "[]", 2)) {
2515 end = field->n_bits - 1;
2517 return xasprintf("%s: syntax error expecting [] or [<bit>] or "
2518 "[<start>..<end>]", *sp);
2520 s = strchr(s, ']') + 1;
2523 return xasprintf("%s: starting bit %d is after ending bit %d",
2525 } else if (start >= field->n_bits) {
2526 return xasprintf("%s: starting bit %d is not valid because field is "
2527 "only %d bits wide", *sp, start, field->n_bits);
2528 } else if (end >= field->n_bits){
2529 return xasprintf("%s: ending bit %d is not valid because field is "
2530 "only %d bits wide", *sp, end, field->n_bits);
2535 sf->n_bits = end - start + 1;
2541 /* Parses a subfield from the beginning of 's' into 'sf'. Returns the first
2542 * byte in 's' following the parsed string.
2544 * Exits with an error message if 's' has incorrect syntax.
2546 * The syntax parsed from 's' takes the form "header[start..end]" where
2547 * 'header' is the name of an NXM field and 'start' and 'end' are (inclusive)
2548 * bit indexes. "..end" may be omitted to indicate a single bit. "start..end"
2549 * may both be omitted (the [] are still required) to indicate an entire
2552 mf_parse_subfield(struct mf_subfield *sf, const char *s)
2554 char *msg = mf_parse_subfield__(sf, &s);
2556 ovs_fatal(0, "%s", msg);