2 * Copyright (c) 2011, 2012, 2013, 2014 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"
23 #include <netinet/icmp6.h>
24 #include <netinet/ip6.h>
26 #include "classifier.h"
27 #include "dynamic-string.h"
29 #include "ofp-errors.h"
31 #include "ovs-thread.h"
35 #include "socket-util.h"
36 #include "unaligned.h"
38 #include "openvswitch/vlog.h"
40 VLOG_DEFINE_THIS_MODULE(meta_flow);
42 #define FLOW_U32OFS(FIELD) \
43 offsetof(struct flow, FIELD) % 4 ? -1 : offsetof(struct flow, FIELD) / 4
45 #define MF_FIELD_SIZES(MEMBER) \
46 sizeof ((union mf_value *)0)->MEMBER, \
47 8 * sizeof ((union mf_value *)0)->MEMBER
49 extern const struct mf_field mf_fields[MFF_N_IDS]; /* Silence a warning. */
51 const struct mf_field mf_fields[MFF_N_IDS] = {
52 #include "meta-flow.inc"
55 /* Maps from an mf_field's 'name' or 'extra_name' to the mf_field. */
56 static struct shash mf_by_name;
58 /* Rate limit for parse errors. These always indicate a bug in an OpenFlow
59 * controller and so there's not much point in showing a lot of them. */
60 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
62 static void nxm_init(void);
64 /* Returns the field with the given 'name', or a null pointer if no field has
66 const struct mf_field *
67 mf_from_name(const char *name)
70 return shash_find_data(&mf_by_name, name);
78 shash_init(&mf_by_name);
79 for (i = 0; i < MFF_N_IDS; i++) {
80 const struct mf_field *mf = &mf_fields[i];
82 ovs_assert(mf->id == i); /* Fields must be in the enum order. */
84 shash_add_once(&mf_by_name, mf->name, mf);
86 shash_add_once(&mf_by_name, mf->extra_name, mf);
94 static pthread_once_t once = PTHREAD_ONCE_INIT;
95 pthread_once(&once, nxm_do_init);
98 /* Returns true if 'wc' wildcards all the bits in field 'mf', false if 'wc'
99 * specifies at least one bit in the field.
101 * The caller is responsible for ensuring that 'wc' corresponds to a flow that
102 * meets 'mf''s prerequisites. */
104 mf_is_all_wild(const struct mf_field *mf, const struct flow_wildcards *wc)
108 return !wc->masks.dp_hash;
110 return !wc->masks.recirc_id;
112 return !wc->masks.tunnel.ip_src;
114 return !wc->masks.tunnel.ip_dst;
119 return !wc->masks.tunnel.tun_id;
121 return !wc->masks.metadata;
123 case MFF_IN_PORT_OXM:
124 return !wc->masks.in_port.ofp_port;
125 case MFF_SKB_PRIORITY:
126 return !wc->masks.skb_priority;
128 return !wc->masks.pkt_mark;
130 return !wc->masks.regs[mf->id - MFF_REG0];
132 return !flow_get_xreg(&wc->masks, mf->id - MFF_XREG0);
133 case MFF_ACTSET_OUTPUT:
134 return !wc->masks.actset_output;
137 return eth_addr_is_zero(wc->masks.dl_src);
139 return eth_addr_is_zero(wc->masks.dl_dst);
141 return !wc->masks.dl_type;
145 return eth_addr_is_zero(wc->masks.arp_sha);
149 return eth_addr_is_zero(wc->masks.arp_tha);
152 return !wc->masks.vlan_tci;
154 return !(wc->masks.vlan_tci & htons(VLAN_VID_MASK));
156 return !(wc->masks.vlan_tci & htons(VLAN_VID_MASK | VLAN_CFI));
157 case MFF_DL_VLAN_PCP:
159 return !(wc->masks.vlan_tci & htons(VLAN_PCP_MASK));
162 return !(wc->masks.mpls_lse[0] & htonl(MPLS_LABEL_MASK));
164 return !(wc->masks.mpls_lse[0] & htonl(MPLS_TC_MASK));
166 return !(wc->masks.mpls_lse[0] & htonl(MPLS_BOS_MASK));
169 return !wc->masks.nw_src;
171 return !wc->masks.nw_dst;
174 return ipv6_mask_is_any(&wc->masks.ipv6_src);
176 return ipv6_mask_is_any(&wc->masks.ipv6_dst);
179 return !wc->masks.ipv6_label;
182 return !wc->masks.nw_proto;
184 case MFF_IP_DSCP_SHIFTED:
185 return !(wc->masks.nw_tos & IP_DSCP_MASK);
187 return !(wc->masks.nw_tos & IP_ECN_MASK);
189 return !wc->masks.nw_ttl;
192 return ipv6_mask_is_any(&wc->masks.nd_target);
195 return !(wc->masks.nw_frag & FLOW_NW_FRAG_MASK);
198 return !wc->masks.nw_proto;
200 return !wc->masks.nw_src;
202 return !wc->masks.nw_dst;
207 case MFF_ICMPV4_TYPE:
208 case MFF_ICMPV6_TYPE:
209 return !wc->masks.tp_src;
213 case MFF_ICMPV4_CODE:
214 case MFF_ICMPV6_CODE:
215 return !wc->masks.tp_dst;
217 return !wc->masks.tcp_flags;
225 /* Initializes 'mask' with the wildcard bit pattern for field 'mf' within 'wc'.
226 * Each bit in 'mask' will be set to 1 if the bit is significant for matching
227 * purposes, or to 0 if it is wildcarded.
229 * The caller is responsible for ensuring that 'wc' corresponds to a flow that
230 * meets 'mf''s prerequisites. */
232 mf_get_mask(const struct mf_field *mf, const struct flow_wildcards *wc,
233 union mf_value *mask)
235 mf_get_value(mf, &wc->masks, mask);
238 /* Tests whether 'mask' is a valid wildcard bit pattern for 'mf'. Returns true
239 * if the mask is valid, false otherwise. */
241 mf_is_mask_valid(const struct mf_field *mf, const union mf_value *mask)
243 switch (mf->maskable) {
245 return (is_all_zeros(mask, mf->n_bytes) ||
246 is_all_ones(mask, mf->n_bytes));
255 /* Returns true if 'flow' meets the prerequisites for 'mf', false otherwise. */
257 mf_are_prereqs_ok(const struct mf_field *mf, const struct flow *flow)
259 switch (mf->prereqs) {
264 return (flow->dl_type == htons(ETH_TYPE_ARP) ||
265 flow->dl_type == htons(ETH_TYPE_RARP));
267 return flow->dl_type == htons(ETH_TYPE_IP);
269 return flow->dl_type == htons(ETH_TYPE_IPV6);
271 return (flow->vlan_tci & htons(VLAN_CFI)) != 0;
273 return eth_type_mpls(flow->dl_type);
275 return is_ip_any(flow);
278 return is_ip_any(flow) && flow->nw_proto == IPPROTO_TCP
279 && !(flow->nw_frag & FLOW_NW_FRAG_LATER);
281 return is_ip_any(flow) && flow->nw_proto == IPPROTO_UDP
282 && !(flow->nw_frag & FLOW_NW_FRAG_LATER);
284 return is_ip_any(flow) && flow->nw_proto == IPPROTO_SCTP
285 && !(flow->nw_frag & FLOW_NW_FRAG_LATER);
287 return is_icmpv4(flow);
289 return is_icmpv6(flow);
292 return (is_icmpv6(flow)
293 && flow->tp_dst == htons(0)
294 && (flow->tp_src == htons(ND_NEIGHBOR_SOLICIT) ||
295 flow->tp_src == htons(ND_NEIGHBOR_ADVERT)));
297 return (is_icmpv6(flow)
298 && flow->tp_dst == htons(0)
299 && (flow->tp_src == htons(ND_NEIGHBOR_SOLICIT)));
301 return (is_icmpv6(flow)
302 && flow->tp_dst == htons(0)
303 && (flow->tp_src == htons(ND_NEIGHBOR_ADVERT)));
309 /* Set field and it's prerequisities in the mask.
310 * This is only ever called for writeable 'mf's, but we do not make the
311 * distinction here. */
313 mf_mask_field_and_prereqs(const struct mf_field *mf, struct flow *mask)
315 static const union mf_value exact_match_mask = MF_EXACT_MASK_INITIALIZER;
317 mf_set_flow_value(mf, &exact_match_mask, mask);
319 switch (mf->prereqs) {
323 mask->tp_src = OVS_BE16_MAX;
324 mask->tp_dst = OVS_BE16_MAX;
331 /* nw_frag always unwildcarded. */
332 mask->nw_proto = 0xff;
339 mask->dl_type = OVS_BE16_MAX;
342 mask->vlan_tci |= htons(VLAN_CFI);
350 /* Returns true if 'value' may be a valid value *as part of a masked match*,
353 * A value is not rejected just because it is not valid for the field in
354 * question, but only if it doesn't make sense to test the bits in question at
355 * all. For example, the MFF_VLAN_TCI field will never have a nonzero value
356 * without the VLAN_CFI bit being set, but we can't reject those values because
357 * it is still legitimate to test just for those bits (see the documentation
358 * for NXM_OF_VLAN_TCI in nicira-ext.h). On the other hand, there is never a
359 * reason to set the low bit of MFF_IP_DSCP to 1, so we reject that. */
361 mf_is_value_valid(const struct mf_field *mf, const union mf_value *value)
374 case MFF_SKB_PRIORITY:
398 case MFF_ICMPV4_TYPE:
399 case MFF_ICMPV4_CODE:
400 case MFF_ICMPV6_TYPE:
401 case MFF_ICMPV6_CODE:
407 case MFF_IN_PORT_OXM:
408 case MFF_ACTSET_OUTPUT: {
410 return !ofputil_port_from_ofp11(value->be32, &port);
414 return !(value->u8 & ~IP_DSCP_MASK);
415 case MFF_IP_DSCP_SHIFTED:
416 return !(value->u8 & (~IP_DSCP_MASK >> 2));
418 return !(value->u8 & ~IP_ECN_MASK);
420 return !(value->u8 & ~FLOW_NW_FRAG_MASK);
422 return !(value->be16 & ~htons(0x0fff));
425 return !(value->be16 & htons(0xff00));
428 return !(value->be16 & htons(VLAN_CFI | VLAN_PCP_MASK));
430 return !(value->be16 & htons(VLAN_PCP_MASK));
432 case MFF_DL_VLAN_PCP:
434 return !(value->u8 & ~(VLAN_PCP_MASK >> VLAN_PCP_SHIFT));
437 return !(value->be32 & ~htonl(IPV6_LABEL_MASK));
440 return !(value->be32 & ~htonl(MPLS_LABEL_MASK >> MPLS_LABEL_SHIFT));
443 return !(value->u8 & ~(MPLS_TC_MASK >> MPLS_TC_SHIFT));
446 return !(value->u8 & ~(MPLS_BOS_MASK >> MPLS_BOS_SHIFT));
454 /* Copies the value of field 'mf' from 'flow' into 'value'. The caller is
455 * responsible for ensuring that 'flow' meets 'mf''s prerequisites. */
457 mf_get_value(const struct mf_field *mf, const struct flow *flow,
458 union mf_value *value)
462 value->be32 = htonl(flow->dp_hash);
465 value->be32 = htonl(flow->recirc_id);
468 value->be64 = flow->tunnel.tun_id;
471 value->be32 = flow->tunnel.ip_src;
474 value->be32 = flow->tunnel.ip_dst;
477 value->be16 = htons(flow->tunnel.flags);
480 value->u8 = flow->tunnel.ip_ttl;
483 value->u8 = flow->tunnel.ip_tos;
487 value->be64 = flow->metadata;
491 value->be16 = htons(ofp_to_u16(flow->in_port.ofp_port));
493 case MFF_IN_PORT_OXM:
494 value->be32 = ofputil_port_to_ofp11(flow->in_port.ofp_port);
496 case MFF_ACTSET_OUTPUT:
497 value->be32 = ofputil_port_to_ofp11(flow->actset_output);
500 case MFF_SKB_PRIORITY:
501 value->be32 = htonl(flow->skb_priority);
505 value->be32 = htonl(flow->pkt_mark);
509 value->be32 = htonl(flow->regs[mf->id - MFF_REG0]);
513 value->be64 = htonll(flow_get_xreg(flow, mf->id - MFF_XREG0));
517 memcpy(value->mac, flow->dl_src, ETH_ADDR_LEN);
521 memcpy(value->mac, flow->dl_dst, ETH_ADDR_LEN);
525 value->be16 = flow->dl_type;
529 value->be16 = flow->vlan_tci;
533 value->be16 = flow->vlan_tci & htons(VLAN_VID_MASK);
536 value->be16 = flow->vlan_tci & htons(VLAN_VID_MASK | VLAN_CFI);
539 case MFF_DL_VLAN_PCP:
541 value->u8 = vlan_tci_to_pcp(flow->vlan_tci);
545 value->be32 = htonl(mpls_lse_to_label(flow->mpls_lse[0]));
549 value->u8 = mpls_lse_to_tc(flow->mpls_lse[0]);
553 value->u8 = mpls_lse_to_bos(flow->mpls_lse[0]);
557 value->be32 = flow->nw_src;
561 value->be32 = flow->nw_dst;
565 value->ipv6 = flow->ipv6_src;
569 value->ipv6 = flow->ipv6_dst;
573 value->be32 = flow->ipv6_label;
577 value->u8 = flow->nw_proto;
581 value->u8 = flow->nw_tos & IP_DSCP_MASK;
584 case MFF_IP_DSCP_SHIFTED:
585 value->u8 = flow->nw_tos >> 2;
589 value->u8 = flow->nw_tos & IP_ECN_MASK;
593 value->u8 = flow->nw_ttl;
597 value->u8 = flow->nw_frag;
601 value->be16 = htons(flow->nw_proto);
605 value->be32 = flow->nw_src;
609 value->be32 = flow->nw_dst;
614 memcpy(value->mac, flow->arp_sha, ETH_ADDR_LEN);
619 memcpy(value->mac, flow->arp_tha, ETH_ADDR_LEN);
625 value->be16 = flow->tp_src;
631 value->be16 = flow->tp_dst;
635 value->be16 = flow->tcp_flags;
638 case MFF_ICMPV4_TYPE:
639 case MFF_ICMPV6_TYPE:
640 value->u8 = ntohs(flow->tp_src);
643 case MFF_ICMPV4_CODE:
644 case MFF_ICMPV6_CODE:
645 value->u8 = ntohs(flow->tp_dst);
649 value->ipv6 = flow->nd_target;
658 /* Makes 'match' match field 'mf' exactly, with the value matched taken from
659 * 'value'. The caller is responsible for ensuring that 'match' meets 'mf''s
662 mf_set_value(const struct mf_field *mf,
663 const union mf_value *value, struct match *match)
667 match_set_dp_hash(match, ntohl(value->be32));
670 match_set_recirc_id(match, ntohl(value->be32));
673 match_set_tun_id(match, value->be64);
676 match_set_tun_src(match, value->be32);
679 match_set_tun_dst(match, value->be32);
682 match_set_tun_flags(match, ntohs(value->be16));
685 match_set_tun_tos(match, value->u8);
688 match_set_tun_ttl(match, value->u8);
692 match_set_metadata(match, value->be64);
696 match_set_in_port(match, u16_to_ofp(ntohs(value->be16)));
699 case MFF_IN_PORT_OXM: {
701 ofputil_port_from_ofp11(value->be32, &port);
702 match_set_in_port(match, port);
705 case MFF_ACTSET_OUTPUT: {
707 ofputil_port_from_ofp11(value->be32, &port);
708 match_set_actset_output(match, port);
712 case MFF_SKB_PRIORITY:
713 match_set_skb_priority(match, ntohl(value->be32));
717 match_set_pkt_mark(match, ntohl(value->be32));
721 match_set_reg(match, mf->id - MFF_REG0, ntohl(value->be32));
725 match_set_xreg(match, mf->id - MFF_XREG0, ntohll(value->be64));
729 match_set_dl_src(match, value->mac);
733 match_set_dl_dst(match, value->mac);
737 match_set_dl_type(match, value->be16);
741 match_set_dl_tci(match, value->be16);
745 match_set_dl_vlan(match, value->be16);
748 match_set_vlan_vid(match, value->be16);
751 case MFF_DL_VLAN_PCP:
753 match_set_dl_vlan_pcp(match, value->u8);
757 match_set_mpls_label(match, 0, value->be32);
761 match_set_mpls_tc(match, 0, value->u8);
765 match_set_mpls_bos(match, 0, value->u8);
769 match_set_nw_src(match, value->be32);
773 match_set_nw_dst(match, value->be32);
777 match_set_ipv6_src(match, &value->ipv6);
781 match_set_ipv6_dst(match, &value->ipv6);
785 match_set_ipv6_label(match, value->be32);
789 match_set_nw_proto(match, value->u8);
793 match_set_nw_dscp(match, value->u8);
796 case MFF_IP_DSCP_SHIFTED:
797 match_set_nw_dscp(match, value->u8 << 2);
801 match_set_nw_ecn(match, value->u8);
805 match_set_nw_ttl(match, value->u8);
809 match_set_nw_frag(match, value->u8);
813 match_set_nw_proto(match, ntohs(value->be16));
817 match_set_nw_src(match, value->be32);
821 match_set_nw_dst(match, value->be32);
826 match_set_arp_sha(match, value->mac);
831 match_set_arp_tha(match, value->mac);
837 match_set_tp_src(match, value->be16);
843 match_set_tp_dst(match, value->be16);
847 match_set_tcp_flags(match, value->be16);
850 case MFF_ICMPV4_TYPE:
851 case MFF_ICMPV6_TYPE:
852 match_set_icmp_type(match, value->u8);
855 case MFF_ICMPV4_CODE:
856 case MFF_ICMPV6_CODE:
857 match_set_icmp_code(match, value->u8);
861 match_set_nd_target(match, &value->ipv6);
870 /* Unwildcard 'mask' member field described by 'mf'. The caller is
871 * responsible for ensuring that 'mask' meets 'mf''s prerequisites. */
873 mf_mask_field(const struct mf_field *mf, struct flow *mask)
875 static const union mf_value exact_match_mask = MF_EXACT_MASK_INITIALIZER;
877 /* For MFF_DL_VLAN, we cannot send a all 1's to flow_set_dl_vlan()
878 * as that will be considered as OFP10_VLAN_NONE. So consider it as a
879 * special case. For the rest, calling mf_set_flow_value() is good
881 if (mf->id == MFF_DL_VLAN) {
882 flow_set_dl_vlan(mask, htons(VLAN_VID_MASK));
884 mf_set_flow_value(mf, &exact_match_mask, mask);
888 /* Sets 'flow' member field described by 'mf' to 'value'. The caller is
889 * responsible for ensuring that 'flow' meets 'mf''s prerequisites.*/
891 mf_set_flow_value(const struct mf_field *mf,
892 const union mf_value *value, struct flow *flow)
896 flow->dp_hash = ntohl(value->be32);
899 flow->recirc_id = ntohl(value->be32);
902 flow->tunnel.tun_id = value->be64;
905 flow->tunnel.ip_src = value->be32;
908 flow->tunnel.ip_dst = value->be32;
911 flow->tunnel.flags = ntohs(value->be16);
914 flow->tunnel.ip_tos = value->u8;
917 flow->tunnel.ip_ttl = value->u8;
921 flow->metadata = value->be64;
925 flow->in_port.ofp_port = u16_to_ofp(ntohs(value->be16));
928 case MFF_IN_PORT_OXM:
929 ofputil_port_from_ofp11(value->be32, &flow->in_port.ofp_port);
931 case MFF_ACTSET_OUTPUT:
932 ofputil_port_from_ofp11(value->be32, &flow->actset_output);
935 case MFF_SKB_PRIORITY:
936 flow->skb_priority = ntohl(value->be32);
940 flow->pkt_mark = ntohl(value->be32);
944 flow->regs[mf->id - MFF_REG0] = ntohl(value->be32);
948 flow_set_xreg(flow, mf->id - MFF_XREG0, ntohll(value->be64));
952 memcpy(flow->dl_src, value->mac, ETH_ADDR_LEN);
956 memcpy(flow->dl_dst, value->mac, ETH_ADDR_LEN);
960 flow->dl_type = value->be16;
964 flow->vlan_tci = value->be16;
968 flow_set_dl_vlan(flow, value->be16);
971 flow_set_vlan_vid(flow, value->be16);
974 case MFF_DL_VLAN_PCP:
976 flow_set_vlan_pcp(flow, value->u8);
980 flow_set_mpls_label(flow, 0, value->be32);
984 flow_set_mpls_tc(flow, 0, value->u8);
988 flow_set_mpls_bos(flow, 0, value->u8);
992 flow->nw_src = value->be32;
996 flow->nw_dst = value->be32;
1000 flow->ipv6_src = value->ipv6;
1004 flow->ipv6_dst = value->ipv6;
1007 case MFF_IPV6_LABEL:
1008 flow->ipv6_label = value->be32 & ~htonl(IPV6_LABEL_MASK);
1012 flow->nw_proto = value->u8;
1016 flow->nw_tos &= ~IP_DSCP_MASK;
1017 flow->nw_tos |= value->u8 & IP_DSCP_MASK;
1020 case MFF_IP_DSCP_SHIFTED:
1021 flow->nw_tos &= ~IP_DSCP_MASK;
1022 flow->nw_tos |= value->u8 << 2;
1026 flow->nw_tos &= ~IP_ECN_MASK;
1027 flow->nw_tos |= value->u8 & IP_ECN_MASK;
1031 flow->nw_ttl = value->u8;
1035 flow->nw_frag = value->u8 & FLOW_NW_FRAG_MASK;
1039 flow->nw_proto = ntohs(value->be16);
1043 flow->nw_src = value->be32;
1047 flow->nw_dst = value->be32;
1052 memcpy(flow->arp_sha, value->mac, ETH_ADDR_LEN);
1057 memcpy(flow->arp_tha, value->mac, ETH_ADDR_LEN);
1063 flow->tp_src = value->be16;
1069 flow->tp_dst = value->be16;
1073 flow->tcp_flags = value->be16;
1076 case MFF_ICMPV4_TYPE:
1077 case MFF_ICMPV6_TYPE:
1078 flow->tp_src = htons(value->u8);
1081 case MFF_ICMPV4_CODE:
1082 case MFF_ICMPV6_CODE:
1083 flow->tp_dst = htons(value->u8);
1087 flow->nd_target = value->ipv6;
1096 /* Consider each of 'src', 'mask', and 'dst' as if they were arrays of 8*n
1097 * bits. Then, for each 0 <= i < 8 * n such that mask[i] == 1, sets dst[i] =
1100 apply_mask(const uint8_t *src, const uint8_t *mask, uint8_t *dst, size_t n)
1104 for (i = 0; i < n; i++) {
1105 dst[i] = (src[i] & mask[i]) | (dst[i] & ~mask[i]);
1109 /* Sets 'flow' member field described by 'field' to 'value', except that bits
1110 * for which 'mask' has a 0-bit keep their existing values. The caller is
1111 * responsible for ensuring that 'flow' meets 'field''s prerequisites.*/
1113 mf_set_flow_value_masked(const struct mf_field *field,
1114 const union mf_value *value,
1115 const union mf_value *mask,
1120 mf_get_value(field, flow, &tmp);
1121 apply_mask((const uint8_t *) value, (const uint8_t *) mask,
1122 (uint8_t *) &tmp, field->n_bytes);
1123 mf_set_flow_value(field, &tmp, flow);
1126 /* Returns true if 'mf' has a zero value in 'flow', false if it is nonzero.
1128 * The caller is responsible for ensuring that 'flow' meets 'mf''s
1131 mf_is_zero(const struct mf_field *mf, const struct flow *flow)
1133 union mf_value value;
1135 mf_get_value(mf, flow, &value);
1136 return is_all_zeros(&value, mf->n_bytes);
1139 /* Makes 'match' wildcard field 'mf'.
1141 * The caller is responsible for ensuring that 'match' meets 'mf''s
1144 mf_set_wild(const struct mf_field *mf, struct match *match)
1148 match->flow.dp_hash = 0;
1149 match->wc.masks.dp_hash = 0;
1152 match->flow.recirc_id = 0;
1153 match->wc.masks.recirc_id = 0;
1156 match_set_tun_id_masked(match, htonll(0), htonll(0));
1159 match_set_tun_src_masked(match, htonl(0), htonl(0));
1162 match_set_tun_dst_masked(match, htonl(0), htonl(0));
1165 match_set_tun_flags_masked(match, 0, 0);
1168 match_set_tun_tos_masked(match, 0, 0);
1171 match_set_tun_ttl_masked(match, 0, 0);
1175 match_set_metadata_masked(match, htonll(0), htonll(0));
1179 case MFF_IN_PORT_OXM:
1180 match->flow.in_port.ofp_port = 0;
1181 match->wc.masks.in_port.ofp_port = 0;
1183 case MFF_ACTSET_OUTPUT:
1184 match->flow.actset_output = 0;
1185 match->wc.masks.actset_output = 0;
1188 case MFF_SKB_PRIORITY:
1189 match->flow.skb_priority = 0;
1190 match->wc.masks.skb_priority = 0;
1194 match->flow.pkt_mark = 0;
1195 match->wc.masks.pkt_mark = 0;
1199 match_set_reg_masked(match, mf->id - MFF_REG0, 0, 0);
1203 match_set_xreg_masked(match, mf->id - MFF_XREG0, 0, 0);
1207 memset(match->flow.dl_src, 0, ETH_ADDR_LEN);
1208 memset(match->wc.masks.dl_src, 0, ETH_ADDR_LEN);
1212 memset(match->flow.dl_dst, 0, ETH_ADDR_LEN);
1213 memset(match->wc.masks.dl_dst, 0, ETH_ADDR_LEN);
1217 match->flow.dl_type = htons(0);
1218 match->wc.masks.dl_type = htons(0);
1222 match_set_dl_tci_masked(match, htons(0), htons(0));
1227 match_set_any_vid(match);
1230 case MFF_DL_VLAN_PCP:
1232 match_set_any_pcp(match);
1235 case MFF_MPLS_LABEL:
1236 match_set_any_mpls_label(match, 0);
1240 match_set_any_mpls_tc(match, 0);
1244 match_set_any_mpls_bos(match, 0);
1249 match_set_nw_src_masked(match, htonl(0), htonl(0));
1254 match_set_nw_dst_masked(match, htonl(0), htonl(0));
1258 memset(&match->wc.masks.ipv6_src, 0, sizeof match->wc.masks.ipv6_src);
1259 memset(&match->flow.ipv6_src, 0, sizeof match->flow.ipv6_src);
1263 memset(&match->wc.masks.ipv6_dst, 0, sizeof match->wc.masks.ipv6_dst);
1264 memset(&match->flow.ipv6_dst, 0, sizeof match->flow.ipv6_dst);
1267 case MFF_IPV6_LABEL:
1268 match->wc.masks.ipv6_label = htonl(0);
1269 match->flow.ipv6_label = htonl(0);
1273 match->wc.masks.nw_proto = 0;
1274 match->flow.nw_proto = 0;
1278 case MFF_IP_DSCP_SHIFTED:
1279 match->wc.masks.nw_tos &= ~IP_DSCP_MASK;
1280 match->flow.nw_tos &= ~IP_DSCP_MASK;
1284 match->wc.masks.nw_tos &= ~IP_ECN_MASK;
1285 match->flow.nw_tos &= ~IP_ECN_MASK;
1289 match->wc.masks.nw_ttl = 0;
1290 match->flow.nw_ttl = 0;
1294 match->wc.masks.nw_frag |= FLOW_NW_FRAG_MASK;
1295 match->flow.nw_frag &= ~FLOW_NW_FRAG_MASK;
1299 match->wc.masks.nw_proto = 0;
1300 match->flow.nw_proto = 0;
1305 memset(match->flow.arp_sha, 0, ETH_ADDR_LEN);
1306 memset(match->wc.masks.arp_sha, 0, ETH_ADDR_LEN);
1311 memset(match->flow.arp_tha, 0, ETH_ADDR_LEN);
1312 memset(match->wc.masks.arp_tha, 0, ETH_ADDR_LEN);
1318 case MFF_ICMPV4_TYPE:
1319 case MFF_ICMPV6_TYPE:
1320 match->wc.masks.tp_src = htons(0);
1321 match->flow.tp_src = htons(0);
1327 case MFF_ICMPV4_CODE:
1328 case MFF_ICMPV6_CODE:
1329 match->wc.masks.tp_dst = htons(0);
1330 match->flow.tp_dst = htons(0);
1334 match->wc.masks.tcp_flags = htons(0);
1335 match->flow.tcp_flags = htons(0);
1339 memset(&match->wc.masks.nd_target, 0,
1340 sizeof match->wc.masks.nd_target);
1341 memset(&match->flow.nd_target, 0, sizeof match->flow.nd_target);
1350 /* Makes 'match' match field 'mf' with the specified 'value' and 'mask'.
1351 * 'value' specifies a value to match and 'mask' specifies a wildcard pattern,
1352 * with a 1-bit indicating that the corresponding value bit must match and a
1353 * 0-bit indicating a don't-care.
1355 * If 'mask' is NULL or points to all-1-bits, then this call is equivalent to
1356 * mf_set_value(mf, value, match). If 'mask' points to all-0-bits, then this
1357 * call is equivalent to mf_set_wild(mf, match).
1359 * 'mask' must be a valid mask for 'mf' (see mf_is_mask_valid()). The caller
1360 * is responsible for ensuring that 'match' meets 'mf''s prerequisites. */
1361 enum ofputil_protocol
1362 mf_set(const struct mf_field *mf,
1363 const union mf_value *value, const union mf_value *mask,
1364 struct match *match)
1366 if (!mask || is_all_ones(mask, mf->n_bytes)) {
1367 mf_set_value(mf, value, match);
1368 return mf->usable_protocols_exact;
1369 } else if (is_all_zeros(mask, mf->n_bytes)) {
1370 mf_set_wild(mf, match);
1371 return OFPUTIL_P_ANY;
1377 case MFF_IN_PORT_OXM:
1378 case MFF_ACTSET_OUTPUT:
1379 case MFF_SKB_PRIORITY:
1382 case MFF_DL_VLAN_PCP:
1384 case MFF_MPLS_LABEL:
1390 case MFF_IP_DSCP_SHIFTED:
1393 case MFF_ICMPV4_TYPE:
1394 case MFF_ICMPV4_CODE:
1395 case MFF_ICMPV6_TYPE:
1396 case MFF_ICMPV6_CODE:
1397 return OFPUTIL_P_NONE;
1400 match_set_dp_hash_masked(match, ntohl(value->be32), ntohl(mask->be32));
1403 match_set_tun_id_masked(match, value->be64, mask->be64);
1406 match_set_tun_src_masked(match, value->be32, mask->be32);
1409 match_set_tun_dst_masked(match, value->be32, mask->be32);
1412 match_set_tun_flags_masked(match, ntohs(value->be16), ntohs(mask->be16));
1415 match_set_tun_ttl_masked(match, value->u8, mask->u8);
1418 match_set_tun_tos_masked(match, value->u8, mask->u8);
1422 match_set_metadata_masked(match, value->be64, mask->be64);
1426 match_set_reg_masked(match, mf->id - MFF_REG0,
1427 ntohl(value->be32), ntohl(mask->be32));
1431 match_set_xreg_masked(match, mf->id - MFF_XREG0,
1432 ntohll(value->be64), ntohll(mask->be64));
1436 match_set_pkt_mark_masked(match, ntohl(value->be32),
1441 match_set_dl_dst_masked(match, value->mac, mask->mac);
1445 match_set_dl_src_masked(match, value->mac, mask->mac);
1450 match_set_arp_sha_masked(match, value->mac, mask->mac);
1455 match_set_arp_tha_masked(match, value->mac, mask->mac);
1459 match_set_dl_tci_masked(match, value->be16, mask->be16);
1463 match_set_vlan_vid_masked(match, value->be16, mask->be16);
1467 match_set_nw_src_masked(match, value->be32, mask->be32);
1471 match_set_nw_dst_masked(match, value->be32, mask->be32);
1475 match_set_ipv6_src_masked(match, &value->ipv6, &mask->ipv6);
1479 match_set_ipv6_dst_masked(match, &value->ipv6, &mask->ipv6);
1482 case MFF_IPV6_LABEL:
1483 if ((mask->be32 & htonl(IPV6_LABEL_MASK)) == htonl(IPV6_LABEL_MASK)) {
1484 mf_set_value(mf, value, match);
1486 match_set_ipv6_label_masked(match, value->be32, mask->be32);
1491 match_set_nd_target_masked(match, &value->ipv6, &mask->ipv6);
1495 match_set_nw_frag_masked(match, value->u8, mask->u8);
1499 match_set_nw_src_masked(match, value->be32, mask->be32);
1503 match_set_nw_dst_masked(match, value->be32, mask->be32);
1509 match_set_tp_src_masked(match, value->be16, mask->be16);
1515 match_set_tp_dst_masked(match, value->be16, mask->be16);
1519 match_set_tcp_flags_masked(match, value->be16, mask->be16);
1527 return ((mf->usable_protocols_bitwise == mf->usable_protocols_cidr
1528 || ip_is_cidr(mask->be32))
1529 ? mf->usable_protocols_cidr
1530 : mf->usable_protocols_bitwise);
1534 mf_check__(const struct mf_subfield *sf, const struct flow *flow,
1538 VLOG_WARN_RL(&rl, "unknown %s field", type);
1539 return OFPERR_OFPBAC_BAD_SET_TYPE;
1540 } else if (!sf->n_bits) {
1541 VLOG_WARN_RL(&rl, "zero bit %s field %s", type, sf->field->name);
1542 return OFPERR_OFPBAC_BAD_SET_LEN;
1543 } else if (sf->ofs >= sf->field->n_bits) {
1544 VLOG_WARN_RL(&rl, "bit offset %d exceeds %d-bit width of %s field %s",
1545 sf->ofs, sf->field->n_bits, type, sf->field->name);
1546 return OFPERR_OFPBAC_BAD_SET_LEN;
1547 } else if (sf->ofs + sf->n_bits > sf->field->n_bits) {
1548 VLOG_WARN_RL(&rl, "bit offset %d and width %d exceeds %d-bit width "
1549 "of %s field %s", sf->ofs, sf->n_bits,
1550 sf->field->n_bits, type, sf->field->name);
1551 return OFPERR_OFPBAC_BAD_SET_LEN;
1552 } else if (flow && !mf_are_prereqs_ok(sf->field, flow)) {
1553 VLOG_WARN_RL(&rl, "%s field %s lacks correct prerequisites",
1554 type, sf->field->name);
1555 return OFPERR_OFPBAC_MATCH_INCONSISTENT;
1561 /* Checks whether 'sf' is valid for reading a subfield out of 'flow'. Returns
1562 * 0 if so, otherwise an OpenFlow error code (e.g. as returned by
1565 mf_check_src(const struct mf_subfield *sf, const struct flow *flow)
1567 return mf_check__(sf, flow, "source");
1570 /* Checks whether 'sf' is valid for writing a subfield into 'flow'. Returns 0
1571 * if so, otherwise an OpenFlow error code (e.g. as returned by
1574 mf_check_dst(const struct mf_subfield *sf, const struct flow *flow)
1576 int error = mf_check__(sf, flow, "destination");
1577 if (!error && !sf->field->writable) {
1578 VLOG_WARN_RL(&rl, "destination field %s is not writable",
1580 return OFPERR_OFPBAC_BAD_SET_ARGUMENT;
1585 /* Copies the value and wildcard bit pattern for 'mf' from 'match' into the
1586 * 'value' and 'mask', respectively. */
1588 mf_get(const struct mf_field *mf, const struct match *match,
1589 union mf_value *value, union mf_value *mask)
1591 mf_get_value(mf, &match->flow, value);
1592 mf_get_mask(mf, &match->wc, mask);
1596 mf_from_integer_string(const struct mf_field *mf, const char *s,
1597 uint8_t *valuep, uint8_t *maskp)
1599 unsigned long long int integer, mask;
1604 integer = strtoull(s, &tail, 0);
1605 if (errno || (*tail != '\0' && *tail != '/')) {
1610 mask = strtoull(tail + 1, &tail, 0);
1611 if (errno || *tail != '\0') {
1618 for (i = mf->n_bytes - 1; i >= 0; i--) {
1619 valuep[i] = integer;
1625 return xasprintf("%s: value too large for %u-byte field %s",
1626 s, mf->n_bytes, mf->name);
1631 return xasprintf("%s: bad syntax for %s", s, mf->name);
1635 mf_from_ethernet_string(const struct mf_field *mf, const char *s,
1636 uint8_t mac[ETH_ADDR_LEN],
1637 uint8_t mask[ETH_ADDR_LEN])
1641 ovs_assert(mf->n_bytes == ETH_ADDR_LEN);
1644 if (ovs_scan(s, ETH_ADDR_SCAN_FMT"%n", ETH_ADDR_SCAN_ARGS(mac), &n)
1645 && n == strlen(s)) {
1646 memset(mask, 0xff, ETH_ADDR_LEN);
1651 if (ovs_scan(s, ETH_ADDR_SCAN_FMT"/"ETH_ADDR_SCAN_FMT"%n",
1652 ETH_ADDR_SCAN_ARGS(mac), ETH_ADDR_SCAN_ARGS(mask), &n)
1653 && n == strlen(s)) {
1657 return xasprintf("%s: invalid Ethernet address", s);
1661 mf_from_ipv4_string(const struct mf_field *mf, const char *s,
1662 ovs_be32 *ip, ovs_be32 *mask)
1666 ovs_assert(mf->n_bytes == sizeof *ip);
1668 if (ovs_scan(s, IP_SCAN_FMT"/"IP_SCAN_FMT,
1669 IP_SCAN_ARGS(ip), IP_SCAN_ARGS(mask))) {
1671 } else if (ovs_scan(s, IP_SCAN_FMT"/%d", IP_SCAN_ARGS(ip), &prefix)) {
1672 if (prefix <= 0 || prefix > 32) {
1673 return xasprintf("%s: network prefix bits not between 0 and "
1676 *mask = be32_prefix_mask(prefix);
1677 } else if (ovs_scan(s, IP_SCAN_FMT, IP_SCAN_ARGS(ip))) {
1678 *mask = OVS_BE32_MAX;
1680 return xasprintf("%s: invalid IP address", s);
1686 mf_from_ipv6_string(const struct mf_field *mf, const char *s,
1687 struct in6_addr *value, struct in6_addr *mask)
1689 char *str = xstrdup(s);
1690 char *save_ptr = NULL;
1691 const char *name, *netmask;
1694 ovs_assert(mf->n_bytes == sizeof *value);
1696 name = strtok_r(str, "/", &save_ptr);
1697 retval = name ? lookup_ipv6(name, value) : EINVAL;
1701 err = xasprintf("%s: could not convert to IPv6 address", str);
1707 netmask = strtok_r(NULL, "/", &save_ptr);
1709 if (inet_pton(AF_INET6, netmask, mask) != 1) {
1710 int prefix = atoi(netmask);
1711 if (prefix <= 0 || prefix > 128) {
1713 return xasprintf("%s: prefix bits not between 1 and 128", s);
1715 *mask = ipv6_create_mask(prefix);
1719 *mask = in6addr_exact;
1727 mf_from_ofp_port_string(const struct mf_field *mf, const char *s,
1728 ovs_be16 *valuep, ovs_be16 *maskp)
1732 ovs_assert(mf->n_bytes == sizeof(ovs_be16));
1734 if (ofputil_port_from_string(s, &port)) {
1735 *valuep = htons(ofp_to_u16(port));
1736 *maskp = OVS_BE16_MAX;
1739 return xasprintf("%s: port value out of range for %s", s, mf->name);
1743 mf_from_ofp_port_string32(const struct mf_field *mf, const char *s,
1744 ovs_be32 *valuep, ovs_be32 *maskp)
1748 ovs_assert(mf->n_bytes == sizeof(ovs_be32));
1749 if (ofputil_port_from_string(s, &port)) {
1750 *valuep = ofputil_port_to_ofp11(port);
1751 *maskp = OVS_BE32_MAX;
1754 return xasprintf("%s: port value out of range for %s", s, mf->name);
1757 struct frag_handling {
1763 static const struct frag_handling all_frags[] = {
1764 #define A FLOW_NW_FRAG_ANY
1765 #define L FLOW_NW_FRAG_LATER
1766 /* name mask value */
1769 { "first", A|L, A },
1770 { "later", A|L, A|L },
1775 { "not_later", L, 0 },
1782 mf_from_frag_string(const char *s, uint8_t *valuep, uint8_t *maskp)
1784 const struct frag_handling *h;
1786 for (h = all_frags; h < &all_frags[ARRAY_SIZE(all_frags)]; h++) {
1787 if (!strcasecmp(s, h->name)) {
1788 /* We force the upper bits of the mask on to make mf_parse_value()
1789 * happy (otherwise it will never think it's an exact match.) */
1790 *maskp = h->mask | ~FLOW_NW_FRAG_MASK;
1796 return xasprintf("%s: unknown fragment type (valid types are \"no\", "
1797 "\"yes\", \"first\", \"later\", \"not_first\"", s);
1801 parse_flow_tun_flags(const char *s_, const char *(*bit_to_string)(uint32_t),
1804 uint32_t result = 0;
1805 char *save_ptr = NULL;
1808 char *s = xstrdup(s_);
1810 for (name = strtok_r((char *)s, " |", &save_ptr); name;
1811 name = strtok_r(NULL, " |", &save_ptr)) {
1813 unsigned long long int flags;
1816 if (ovs_scan(name, "%lli", &flags)) {
1820 name_len = strlen(name);
1821 for (bit = 1; bit; bit <<= 1) {
1822 const char *fname = bit_to_string(bit);
1829 len = strlen(fname);
1830 if (len != name_len) {
1833 if (!strncmp(name, fname, len)) {
1845 *res = htons(result);
1852 mf_from_tun_flags_string(const char *s, ovs_be16 *valuep, ovs_be16 *maskp)
1854 if (!parse_flow_tun_flags(s, flow_tun_flag_to_string, valuep)) {
1855 *maskp = OVS_BE16_MAX;
1859 return xasprintf("%s: unknown tunnel flags (valid flags are \"df\", "
1860 "\"csum\", \"key\")", s);
1864 mf_from_tcp_flags_string(const char *s, ovs_be16 *flagsp, ovs_be16 *maskp)
1871 if (ovs_scan(s, "%"SCNi16"/%"SCNi16"%n", &flags, &mask, &n) && !s[n]) {
1872 *flagsp = htons(flags);
1873 *maskp = htons(mask);
1876 if (ovs_scan(s, "%"SCNi16"%n", &flags, &n) && !s[n]) {
1877 *flagsp = htons(flags);
1878 *maskp = OVS_BE16_MAX;
1882 while (*s != '\0') {
1894 return xasprintf("%s: TCP flag must be preceded by '+' (for SET) "
1895 "or '-' (NOT SET)", s);
1899 name_len = strcspn(s,"+-");
1901 for (bit = 1; bit; bit <<= 1) {
1902 const char *fname = packet_tcp_flag_to_string(bit);
1909 len = strlen(fname);
1910 if (len != name_len) {
1913 if (!strncmp(s, fname, len)) {
1915 return xasprintf("%s: Each TCP flag can be specified only "
1927 return xasprintf("%s: unknown TCP flag(s)", s);
1932 *flagsp = htons(flags);
1933 *maskp = htons(mask);
1938 /* Parses 's', a string value for field 'mf', into 'value' and 'mask'. Returns
1939 * NULL if successful, otherwise a malloc()'d string describing the error. */
1941 mf_parse(const struct mf_field *mf, const char *s,
1942 union mf_value *value, union mf_value *mask)
1946 if (!strcmp(s, "*")) {
1947 memset(value, 0, mf->n_bytes);
1948 memset(mask, 0, mf->n_bytes);
1952 switch (mf->string) {
1954 case MFS_HEXADECIMAL:
1955 error = mf_from_integer_string(mf, s,
1956 (uint8_t *) value, (uint8_t *) mask);
1960 error = mf_from_ethernet_string(mf, s, value->mac, mask->mac);
1964 error = mf_from_ipv4_string(mf, s, &value->be32, &mask->be32);
1968 error = mf_from_ipv6_string(mf, s, &value->ipv6, &mask->ipv6);
1972 error = mf_from_ofp_port_string(mf, s, &value->be16, &mask->be16);
1975 case MFS_OFP_PORT_OXM:
1976 error = mf_from_ofp_port_string32(mf, s, &value->be32, &mask->be32);
1980 error = mf_from_frag_string(s, &value->u8, &mask->u8);
1984 ovs_assert(mf->n_bytes == sizeof(ovs_be16));
1985 error = mf_from_tun_flags_string(s, &value->be16, &mask->be16);
1989 ovs_assert(mf->n_bytes == sizeof(ovs_be16));
1990 error = mf_from_tcp_flags_string(s, &value->be16, &mask->be16);
1997 if (!error && !mf_is_mask_valid(mf, mask)) {
1998 error = xasprintf("%s: invalid mask for field %s", s, mf->name);
2003 /* Parses 's', a string value for field 'mf', into 'value'. Returns NULL if
2004 * successful, otherwise a malloc()'d string describing the error. */
2006 mf_parse_value(const struct mf_field *mf, const char *s, union mf_value *value)
2008 union mf_value mask;
2011 error = mf_parse(mf, s, value, &mask);
2016 if (!is_all_ones((const uint8_t *) &mask, mf->n_bytes)) {
2017 return xasprintf("%s: wildcards not allowed here", s);
2023 mf_format_integer_string(const struct mf_field *mf, const uint8_t *valuep,
2024 const uint8_t *maskp, struct ds *s)
2026 unsigned long long int integer;
2029 ovs_assert(mf->n_bytes <= 8);
2032 for (i = 0; i < mf->n_bytes; i++) {
2033 integer = (integer << 8) | valuep[i];
2035 if (mf->string == MFS_HEXADECIMAL) {
2036 ds_put_format(s, "%#llx", integer);
2038 ds_put_format(s, "%lld", integer);
2042 unsigned long long int mask;
2045 for (i = 0; i < mf->n_bytes; i++) {
2046 mask = (mask << 8) | maskp[i];
2049 /* I guess we could write the mask in decimal for MFS_DECIMAL but I'm
2050 * not sure that that a bit-mask written in decimal is ever easier to
2051 * understand than the same bit-mask written in hexadecimal. */
2052 ds_put_format(s, "/%#llx", mask);
2057 mf_format_frag_string(uint8_t value, uint8_t mask, struct ds *s)
2059 const struct frag_handling *h;
2061 mask &= FLOW_NW_FRAG_MASK;
2064 for (h = all_frags; h < &all_frags[ARRAY_SIZE(all_frags)]; h++) {
2065 if (value == h->value && mask == h->mask) {
2066 ds_put_cstr(s, h->name);
2070 ds_put_cstr(s, "<error>");
2074 mf_format_tnl_flags_string(const ovs_be16 *valuep, struct ds *s)
2076 format_flags(s, flow_tun_flag_to_string, ntohs(*valuep), '|');
2080 mf_format_tcp_flags_string(ovs_be16 value, ovs_be16 mask, struct ds *s)
2082 format_flags_masked(s, NULL, packet_tcp_flag_to_string, ntohs(value),
2086 /* Appends to 's' a string representation of field 'mf' whose value is in
2087 * 'value' and 'mask'. 'mask' may be NULL to indicate an exact match. */
2089 mf_format(const struct mf_field *mf,
2090 const union mf_value *value, const union mf_value *mask,
2094 if (is_all_zeros(mask, mf->n_bytes)) {
2095 ds_put_cstr(s, "ANY");
2097 } else if (is_all_ones(mask, mf->n_bytes)) {
2102 switch (mf->string) {
2103 case MFS_OFP_PORT_OXM:
2106 ofputil_port_from_ofp11(value->be32, &port);
2107 ofputil_format_port(port, s);
2113 ofputil_format_port(u16_to_ofp(ntohs(value->be16)), s);
2118 case MFS_HEXADECIMAL:
2119 mf_format_integer_string(mf, (uint8_t *) value, (uint8_t *) mask, s);
2123 eth_format_masked(value->mac, mask->mac, s);
2127 ip_format_masked(value->be32, mask ? mask->be32 : OVS_BE32_MAX, s);
2131 print_ipv6_masked(s, &value->ipv6, mask ? &mask->ipv6 : NULL);
2135 mf_format_frag_string(value->u8, mask ? mask->u8 : UINT8_MAX, s);
2139 mf_format_tnl_flags_string(&value->be16, s);
2143 mf_format_tcp_flags_string(value->be16,
2144 mask ? mask->be16 : OVS_BE16_MAX, s);
2152 /* Makes subfield 'sf' within 'flow' exactly match the 'sf->n_bits'
2153 * least-significant bits in 'x'.
2156 mf_write_subfield_flow(const struct mf_subfield *sf,
2157 const union mf_subvalue *x, struct flow *flow)
2159 const struct mf_field *field = sf->field;
2160 union mf_value value;
2162 mf_get_value(field, flow, &value);
2163 bitwise_copy(x, sizeof *x, 0, &value, field->n_bytes,
2164 sf->ofs, sf->n_bits);
2165 mf_set_flow_value(field, &value, flow);
2168 /* Makes subfield 'sf' within 'match' exactly match the 'sf->n_bits'
2169 * least-significant bits in 'x'.
2172 mf_write_subfield(const struct mf_subfield *sf, const union mf_subvalue *x,
2173 struct match *match)
2175 const struct mf_field *field = sf->field;
2176 union mf_value value, mask;
2178 mf_get(field, match, &value, &mask);
2179 bitwise_copy(x, sizeof *x, 0, &value, field->n_bytes, sf->ofs, sf->n_bits);
2180 bitwise_one ( &mask, field->n_bytes, sf->ofs, sf->n_bits);
2181 mf_set(field, &value, &mask, match);
2184 /* Initializes 'x' to the value of 'sf' within 'flow'. 'sf' must be valid for
2185 * reading 'flow', e.g. as checked by mf_check_src(). */
2187 mf_read_subfield(const struct mf_subfield *sf, const struct flow *flow,
2188 union mf_subvalue *x)
2190 union mf_value value;
2192 mf_get_value(sf->field, flow, &value);
2194 memset(x, 0, sizeof *x);
2195 bitwise_copy(&value, sf->field->n_bytes, sf->ofs,
2200 /* Returns the value of 'sf' within 'flow'. 'sf' must be valid for reading
2201 * 'flow', e.g. as checked by mf_check_src() and sf->n_bits must be 64 or
2204 mf_get_subfield(const struct mf_subfield *sf, const struct flow *flow)
2206 union mf_value value;
2208 mf_get_value(sf->field, flow, &value);
2209 return bitwise_get(&value, sf->field->n_bytes, sf->ofs, sf->n_bits);
2213 mf_format_subvalue(const union mf_subvalue *subvalue, struct ds *s)
2217 for (i = 0; i < ARRAY_SIZE(subvalue->u8); i++) {
2218 if (subvalue->u8[i]) {
2219 ds_put_format(s, "0x%"PRIx8, subvalue->u8[i]);
2220 for (i++; i < ARRAY_SIZE(subvalue->u8); i++) {
2221 ds_put_format(s, "%02"PRIx8, subvalue->u8[i]);
2226 ds_put_char(s, '0');