lib/meta-flow.c

   1 /*
   2  * Copyright (c) 2011, 2012, 2013, 2014 Nicira, Inc.
   3  *
   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:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  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.
  15  */
  16
  17 #include <config.h>
  18
  19 #include "meta-flow.h"
  20
  21 #include <errno.h>
  22 #include <limits.h>
  23 #include <netinet/icmp6.h>
  24 #include <netinet/ip6.h>
  25
  26 #include "classifier.h"
  27 #include "dynamic-string.h"
  28 #include "nx-match.h"
  29 #include "ofp-errors.h"
  30 #include "ofp-util.h"
  31 #include "ovs-thread.h"
  32 #include "packets.h"
  33 #include "random.h"
  34 #include "shash.h"
  35 #include "socket-util.h"
  36 #include "unaligned.h"
  37 #include "vlog.h"
  38
  39 VLOG_DEFINE_THIS_MODULE(meta_flow);
  40
  41 #define FLOW_U32OFS(FIELD)                                              \
  42     offsetof(struct flow, FIELD) % 4 ? -1 : offsetof(struct flow, FIELD) / 4
  43
  44 #define MF_FIELD_SIZES(MEMBER)                  \
  45     sizeof ((union mf_value *)0)->MEMBER,       \
  46     8 * sizeof ((union mf_value *)0)->MEMBER
  47
  48 extern const struct mf_field mf_fields[MFF_N_IDS]; /* Silence a warning. */
  49
  50 const struct mf_field mf_fields[MFF_N_IDS] = {
  51 #include "meta-flow.inc"
  52 };
  53
  54 /* Maps from an mf_field's 'name' or 'extra_name' to the mf_field. */
  55 static struct shash mf_by_name;
  56
  57 /* Rate limit for parse errors.  These always indicate a bug in an OpenFlow
  58  * controller and so there's not much point in showing a lot of them. */
  59 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
  60
  61 static void nxm_init(void);
  62
  63 /* Returns the field with the given 'name', or a null pointer if no field has
  64  * that name. */
  65 const struct mf_field *
  66 mf_from_name(const char *name)
  67 {
  68     nxm_init();
  69     return shash_find_data(&mf_by_name, name);
  70 }
  71
  72 static void
  73 nxm_do_init(void)
  74 {
  75     int i;
  76
  77     shash_init(&mf_by_name);
  78     for (i = 0; i < MFF_N_IDS; i++) {
  79         const struct mf_field *mf = &mf_fields[i];
  80
  81         ovs_assert(mf->id == i); /* Fields must be in the enum order. */
  82
  83         shash_add_once(&mf_by_name, mf->name, mf);
  84         if (mf->extra_name) {
  85             shash_add_once(&mf_by_name, mf->extra_name, mf);
  86         }
  87     }
  88 }
  89
  90 static void
  91 nxm_init(void)
  92 {
  93     static pthread_once_t once = PTHREAD_ONCE_INIT;
  94     pthread_once(&once, nxm_do_init);
  95 }
  96
  97 /* Returns true if 'wc' wildcards all the bits in field 'mf', false if 'wc'
  98  * specifies at least one bit in the field.
  99  *
 100  * The caller is responsible for ensuring that 'wc' corresponds to a flow that
 101  * meets 'mf''s prerequisites. */
 102 bool
 103 mf_is_all_wild(const struct mf_field *mf, const struct flow_wildcards *wc)
 104 {
 105     switch (mf->id) {
 106     case MFF_DP_HASH:
 107         return !wc->masks.dp_hash;
 108     case MFF_RECIRC_ID:
 109         return !wc->masks.recirc_id;
 110     case MFF_TUN_SRC:
 111         return !wc->masks.tunnel.ip_src;
 112     case MFF_TUN_DST:
 113         return !wc->masks.tunnel.ip_dst;
 114     case MFF_TUN_ID:
 115     case MFF_TUN_TOS:
 116     case MFF_TUN_TTL:
 117     case MFF_TUN_FLAGS:
 118         return !wc->masks.tunnel.tun_id;
 119     case MFF_METADATA:
 120         return !wc->masks.metadata;
 121     case MFF_IN_PORT:
 122     case MFF_IN_PORT_OXM:
 123         return !wc->masks.in_port.ofp_port;
 124     case MFF_SKB_PRIORITY:
 125         return !wc->masks.skb_priority;
 126     case MFF_PKT_MARK:
 127         return !wc->masks.pkt_mark;
 128     CASE_MFF_REGS:
 129         return !wc->masks.regs[mf->id - MFF_REG0];
 130     CASE_MFF_XREGS:
 131         return !flow_get_xreg(&wc->masks, mf->id - MFF_XREG0);
 132
 133     case MFF_ETH_SRC:
 134         return eth_addr_is_zero(wc->masks.dl_src);
 135     case MFF_ETH_DST:
 136         return eth_addr_is_zero(wc->masks.dl_dst);
 137     case MFF_ETH_TYPE:
 138         return !wc->masks.dl_type;
 139
 140     case MFF_ARP_SHA:
 141     case MFF_ND_SLL:
 142         return eth_addr_is_zero(wc->masks.arp_sha);
 143
 144     case MFF_ARP_THA:
 145     case MFF_ND_TLL:
 146         return eth_addr_is_zero(wc->masks.arp_tha);
 147
 148     case MFF_VLAN_TCI:
 149         return !wc->masks.vlan_tci;
 150     case MFF_DL_VLAN:
 151         return !(wc->masks.vlan_tci & htons(VLAN_VID_MASK));
 152     case MFF_VLAN_VID:
 153         return !(wc->masks.vlan_tci & htons(VLAN_VID_MASK | VLAN_CFI));
 154     case MFF_DL_VLAN_PCP:
 155     case MFF_VLAN_PCP:
 156         return !(wc->masks.vlan_tci & htons(VLAN_PCP_MASK));
 157
 158     case MFF_MPLS_LABEL:
 159         return !(wc->masks.mpls_lse[0] & htonl(MPLS_LABEL_MASK));
 160     case MFF_MPLS_TC:
 161         return !(wc->masks.mpls_lse[0] & htonl(MPLS_TC_MASK));
 162     case MFF_MPLS_BOS:
 163         return !(wc->masks.mpls_lse[0] & htonl(MPLS_BOS_MASK));
 164
 165     case MFF_IPV4_SRC:
 166         return !wc->masks.nw_src;
 167     case MFF_IPV4_DST:
 168         return !wc->masks.nw_dst;
 169
 170     case MFF_IPV6_SRC:
 171         return ipv6_mask_is_any(&wc->masks.ipv6_src);
 172     case MFF_IPV6_DST:
 173         return ipv6_mask_is_any(&wc->masks.ipv6_dst);
 174
 175     case MFF_IPV6_LABEL:
 176         return !wc->masks.ipv6_label;
 177
 178     case MFF_IP_PROTO:
 179         return !wc->masks.nw_proto;
 180     case MFF_IP_DSCP:
 181     case MFF_IP_DSCP_SHIFTED:
 182         return !(wc->masks.nw_tos & IP_DSCP_MASK);
 183     case MFF_IP_ECN:
 184         return !(wc->masks.nw_tos & IP_ECN_MASK);
 185     case MFF_IP_TTL:
 186         return !wc->masks.nw_ttl;
 187
 188     case MFF_ND_TARGET:
 189         return ipv6_mask_is_any(&wc->masks.nd_target);
 190
 191     case MFF_IP_FRAG:
 192         return !(wc->masks.nw_frag & FLOW_NW_FRAG_MASK);
 193
 194     case MFF_ARP_OP:
 195         return !wc->masks.nw_proto;
 196     case MFF_ARP_SPA:
 197         return !wc->masks.nw_src;
 198     case MFF_ARP_TPA:
 199         return !wc->masks.nw_dst;
 200
 201     case MFF_TCP_SRC:
 202     case MFF_UDP_SRC:
 203     case MFF_SCTP_SRC:
 204     case MFF_ICMPV4_TYPE:
 205     case MFF_ICMPV6_TYPE:
 206         return !wc->masks.tp_src;
 207     case MFF_TCP_DST:
 208     case MFF_UDP_DST:
 209     case MFF_SCTP_DST:
 210     case MFF_ICMPV4_CODE:
 211     case MFF_ICMPV6_CODE:
 212         return !wc->masks.tp_dst;
 213     case MFF_TCP_FLAGS:
 214         return !wc->masks.tcp_flags;
 215
 216     case MFF_N_IDS:
 217     default:
 218         OVS_NOT_REACHED();
 219     }
 220 }
 221
 222 /* Initializes 'mask' with the wildcard bit pattern for field 'mf' within 'wc'.
 223  * Each bit in 'mask' will be set to 1 if the bit is significant for matching
 224  * purposes, or to 0 if it is wildcarded.
 225  *
 226  * The caller is responsible for ensuring that 'wc' corresponds to a flow that
 227  * meets 'mf''s prerequisites. */
 228 void
 229 mf_get_mask(const struct mf_field *mf, const struct flow_wildcards *wc,
 230             union mf_value *mask)
 231 {
 232     mf_get_value(mf, &wc->masks, mask);
 233 }
 234
 235 /* Tests whether 'mask' is a valid wildcard bit pattern for 'mf'.  Returns true
 236  * if the mask is valid, false otherwise. */
 237 bool
 238 mf_is_mask_valid(const struct mf_field *mf, const union mf_value *mask)
 239 {
 240     switch (mf->maskable) {
 241     case MFM_NONE:
 242         return (is_all_zeros(mask, mf->n_bytes) ||
 243                 is_all_ones(mask, mf->n_bytes));
 244
 245     case MFM_FULLY:
 246         return true;
 247     }
 248
 249     OVS_NOT_REACHED();
 250 }
 251
 252 /* Returns true if 'flow' meets the prerequisites for 'mf', false otherwise. */
 253 bool
 254 mf_are_prereqs_ok(const struct mf_field *mf, const struct flow *flow)
 255 {
 256     switch (mf->prereqs) {
 257     case MFP_NONE:
 258         return true;
 259
 260     case MFP_ARP:
 261       return (flow->dl_type == htons(ETH_TYPE_ARP) ||
 262               flow->dl_type == htons(ETH_TYPE_RARP));
 263     case MFP_IPV4:
 264         return flow->dl_type == htons(ETH_TYPE_IP);
 265     case MFP_IPV6:
 266         return flow->dl_type == htons(ETH_TYPE_IPV6);
 267     case MFP_VLAN_VID:
 268         return (flow->vlan_tci & htons(VLAN_CFI)) != 0;
 269     case MFP_MPLS:
 270         return eth_type_mpls(flow->dl_type);
 271     case MFP_IP_ANY:
 272         return is_ip_any(flow);
 273
 274     case MFP_TCP:
 275         return is_ip_any(flow) && flow->nw_proto == IPPROTO_TCP;
 276     case MFP_UDP:
 277         return is_ip_any(flow) && flow->nw_proto == IPPROTO_UDP;
 278     case MFP_SCTP:
 279         return is_ip_any(flow) && flow->nw_proto == IPPROTO_SCTP;
 280     case MFP_ICMPV4:
 281         return is_icmpv4(flow);
 282     case MFP_ICMPV6:
 283         return is_icmpv6(flow);
 284
 285     case MFP_ND:
 286         return (is_icmpv6(flow)
 287                 && flow->tp_dst == htons(0)
 288                 && (flow->tp_src == htons(ND_NEIGHBOR_SOLICIT) ||
 289                     flow->tp_src == htons(ND_NEIGHBOR_ADVERT)));
 290     case MFP_ND_SOLICIT:
 291         return (is_icmpv6(flow)
 292                 && flow->tp_dst == htons(0)
 293                 && (flow->tp_src == htons(ND_NEIGHBOR_SOLICIT)));
 294     case MFP_ND_ADVERT:
 295         return (is_icmpv6(flow)
 296                 && flow->tp_dst == htons(0)
 297                 && (flow->tp_src == htons(ND_NEIGHBOR_ADVERT)));
 298     }
 299
 300     OVS_NOT_REACHED();
 301 }
 302
 303 /* Set field and it's prerequisities in the mask.
 304  * This is only ever called for writeable 'mf's, but we do not make the
 305  * distinction here. */
 306 void
 307 mf_mask_field_and_prereqs(const struct mf_field *mf, struct flow *mask)
 308 {
 309     static const union mf_value exact_match_mask = MF_EXACT_MASK_INITIALIZER;
 310
 311     mf_set_flow_value(mf, &exact_match_mask, mask);
 312
 313     switch (mf->prereqs) {
 314     case MFP_ND:
 315     case MFP_ND_SOLICIT:
 316     case MFP_ND_ADVERT:
 317         mask->tp_src = OVS_BE16_MAX;
 318         mask->tp_dst = OVS_BE16_MAX;
 319         /* Fall through. */
 320     case MFP_TCP:
 321     case MFP_UDP:
 322     case MFP_SCTP:
 323     case MFP_ICMPV4:
 324     case MFP_ICMPV6:
 325         mask->nw_proto = 0xff;
 326         /* Fall through. */
 327     case MFP_ARP:
 328     case MFP_IPV4:
 329     case MFP_IPV6:
 330     case MFP_MPLS:
 331     case MFP_IP_ANY:
 332         mask->dl_type = OVS_BE16_MAX;
 333         break;
 334     case MFP_VLAN_VID:
 335         mask->vlan_tci |= htons(VLAN_CFI);
 336         break;
 337     case MFP_NONE:
 338         break;
 339     }
 340 }
 341
 342
 343 /* Returns true if 'value' may be a valid value *as part of a masked match*,
 344  * false otherwise.
 345  *
 346  * A value is not rejected just because it is not valid for the field in
 347  * question, but only if it doesn't make sense to test the bits in question at
 348  * all.  For example, the MFF_VLAN_TCI field will never have a nonzero value
 349  * without the VLAN_CFI bit being set, but we can't reject those values because
 350  * it is still legitimate to test just for those bits (see the documentation
 351  * for NXM_OF_VLAN_TCI in nicira-ext.h).  On the other hand, there is never a
 352  * reason to set the low bit of MFF_IP_DSCP to 1, so we reject that. */
 353 bool
 354 mf_is_value_valid(const struct mf_field *mf, const union mf_value *value)
 355 {
 356     switch (mf->id) {
 357     case MFF_DP_HASH:
 358     case MFF_RECIRC_ID:
 359     case MFF_TUN_ID:
 360     case MFF_TUN_SRC:
 361     case MFF_TUN_DST:
 362     case MFF_TUN_TOS:
 363     case MFF_TUN_TTL:
 364     case MFF_TUN_FLAGS:
 365     case MFF_METADATA:
 366     case MFF_IN_PORT:
 367     case MFF_SKB_PRIORITY:
 368     case MFF_PKT_MARK:
 369     CASE_MFF_REGS:
 370     CASE_MFF_XREGS:
 371     case MFF_ETH_SRC:
 372     case MFF_ETH_DST:
 373     case MFF_ETH_TYPE:
 374     case MFF_VLAN_TCI:
 375     case MFF_IPV4_SRC:
 376     case MFF_IPV4_DST:
 377     case MFF_IPV6_SRC:
 378     case MFF_IPV6_DST:
 379     case MFF_IP_PROTO:
 380     case MFF_IP_TTL:
 381     case MFF_ARP_SPA:
 382     case MFF_ARP_TPA:
 383     case MFF_ARP_SHA:
 384     case MFF_ARP_THA:
 385     case MFF_TCP_SRC:
 386     case MFF_TCP_DST:
 387     case MFF_UDP_SRC:
 388     case MFF_UDP_DST:
 389     case MFF_SCTP_SRC:
 390     case MFF_SCTP_DST:
 391     case MFF_ICMPV4_TYPE:
 392     case MFF_ICMPV4_CODE:
 393     case MFF_ICMPV6_TYPE:
 394     case MFF_ICMPV6_CODE:
 395     case MFF_ND_TARGET:
 396     case MFF_ND_SLL:
 397     case MFF_ND_TLL:
 398         return true;
 399
 400     case MFF_IN_PORT_OXM: {
 401         ofp_port_t port;
 402         return !ofputil_port_from_ofp11(value->be32, &port);
 403     }
 404
 405     case MFF_IP_DSCP:
 406         return !(value->u8 & ~IP_DSCP_MASK);
 407     case MFF_IP_DSCP_SHIFTED:
 408         return !(value->u8 & (~IP_DSCP_MASK >> 2));
 409     case MFF_IP_ECN:
 410         return !(value->u8 & ~IP_ECN_MASK);
 411     case MFF_IP_FRAG:
 412         return !(value->u8 & ~FLOW_NW_FRAG_MASK);
 413     case MFF_TCP_FLAGS:
 414         return !(value->be16 & ~htons(0x0fff));
 415
 416     case MFF_ARP_OP:
 417         return !(value->be16 & htons(0xff00));
 418
 419     case MFF_DL_VLAN:
 420         return !(value->be16 & htons(VLAN_CFI | VLAN_PCP_MASK));
 421     case MFF_VLAN_VID:
 422         return !(value->be16 & htons(VLAN_PCP_MASK));
 423
 424     case MFF_DL_VLAN_PCP:
 425     case MFF_VLAN_PCP:
 426         return !(value->u8 & ~(VLAN_PCP_MASK >> VLAN_PCP_SHIFT));
 427
 428     case MFF_IPV6_LABEL:
 429         return !(value->be32 & ~htonl(IPV6_LABEL_MASK));
 430
 431     case MFF_MPLS_LABEL:
 432         return !(value->be32 & ~htonl(MPLS_LABEL_MASK >> MPLS_LABEL_SHIFT));
 433
 434     case MFF_MPLS_TC:
 435         return !(value->u8 & ~(MPLS_TC_MASK >> MPLS_TC_SHIFT));
 436
 437     case MFF_MPLS_BOS:
 438         return !(value->u8 & ~(MPLS_BOS_MASK >> MPLS_BOS_SHIFT));
 439
 440     case MFF_N_IDS:
 441     default:
 442         OVS_NOT_REACHED();
 443     }
 444 }
 445
 446 /* Copies the value of field 'mf' from 'flow' into 'value'.  The caller is
 447  * responsible for ensuring that 'flow' meets 'mf''s prerequisites. */
 448 void
 449 mf_get_value(const struct mf_field *mf, const struct flow *flow,
 450              union mf_value *value)
 451 {
 452     switch (mf->id) {
 453     case MFF_DP_HASH:
 454         value->be32 = htonl(flow->dp_hash);
 455         break;
 456     case MFF_RECIRC_ID:
 457         value->be32 = htonl(flow->recirc_id);
 458         break;
 459     case MFF_TUN_ID:
 460         value->be64 = flow->tunnel.tun_id;
 461         break;
 462     case MFF_TUN_SRC:
 463         value->be32 = flow->tunnel.ip_src;
 464         break;
 465     case MFF_TUN_DST:
 466         value->be32 = flow->tunnel.ip_dst;
 467         break;
 468     case MFF_TUN_FLAGS:
 469         value->be16 = htons(flow->tunnel.flags);
 470         break;
 471     case MFF_TUN_TTL:
 472         value->u8 = flow->tunnel.ip_ttl;
 473         break;
 474     case MFF_TUN_TOS:
 475         value->u8 = flow->tunnel.ip_tos;
 476         break;
 477
 478     case MFF_METADATA:
 479         value->be64 = flow->metadata;
 480         break;
 481
 482     case MFF_IN_PORT:
 483         value->be16 = htons(ofp_to_u16(flow->in_port.ofp_port));
 484         break;
 485     case MFF_IN_PORT_OXM:
 486         value->be32 = ofputil_port_to_ofp11(flow->in_port.ofp_port);
 487         break;
 488
 489     case MFF_SKB_PRIORITY:
 490         value->be32 = htonl(flow->skb_priority);
 491         break;
 492
 493     case MFF_PKT_MARK:
 494         value->be32 = htonl(flow->pkt_mark);
 495         break;
 496
 497     CASE_MFF_REGS:
 498         value->be32 = htonl(flow->regs[mf->id - MFF_REG0]);
 499         break;
 500
 501     CASE_MFF_XREGS:
 502         value->be64 = htonll(flow_get_xreg(flow, mf->id - MFF_XREG0));
 503         break;
 504
 505     case MFF_ETH_SRC:
 506         memcpy(value->mac, flow->dl_src, ETH_ADDR_LEN);
 507         break;
 508
 509     case MFF_ETH_DST:
 510         memcpy(value->mac, flow->dl_dst, ETH_ADDR_LEN);
 511         break;
 512
 513     case MFF_ETH_TYPE:
 514         value->be16 = flow->dl_type;
 515         break;
 516
 517     case MFF_VLAN_TCI:
 518         value->be16 = flow->vlan_tci;
 519         break;
 520
 521     case MFF_DL_VLAN:
 522         value->be16 = flow->vlan_tci & htons(VLAN_VID_MASK);
 523         break;
 524     case MFF_VLAN_VID:
 525         value->be16 = flow->vlan_tci & htons(VLAN_VID_MASK | VLAN_CFI);
 526         break;
 527
 528     case MFF_DL_VLAN_PCP:
 529     case MFF_VLAN_PCP:
 530         value->u8 = vlan_tci_to_pcp(flow->vlan_tci);
 531         break;
 532
 533     case MFF_MPLS_LABEL:
 534         value->be32 = htonl(mpls_lse_to_label(flow->mpls_lse[0]));
 535         break;
 536
 537     case MFF_MPLS_TC:
 538         value->u8 = mpls_lse_to_tc(flow->mpls_lse[0]);
 539         break;
 540
 541     case MFF_MPLS_BOS:
 542         value->u8 = mpls_lse_to_bos(flow->mpls_lse[0]);
 543         break;
 544
 545     case MFF_IPV4_SRC:
 546         value->be32 = flow->nw_src;
 547         break;
 548
 549     case MFF_IPV4_DST:
 550         value->be32 = flow->nw_dst;
 551         break;
 552
 553     case MFF_IPV6_SRC:
 554         value->ipv6 = flow->ipv6_src;
 555         break;
 556
 557     case MFF_IPV6_DST:
 558         value->ipv6 = flow->ipv6_dst;
 559         break;
 560
 561     case MFF_IPV6_LABEL:
 562         value->be32 = flow->ipv6_label;
 563         break;
 564
 565     case MFF_IP_PROTO:
 566         value->u8 = flow->nw_proto;
 567         break;
 568
 569     case MFF_IP_DSCP:
 570         value->u8 = flow->nw_tos & IP_DSCP_MASK;
 571         break;
 572
 573     case MFF_IP_DSCP_SHIFTED:
 574         value->u8 = flow->nw_tos >> 2;
 575         break;
 576
 577     case MFF_IP_ECN:
 578         value->u8 = flow->nw_tos & IP_ECN_MASK;
 579         break;
 580
 581     case MFF_IP_TTL:
 582         value->u8 = flow->nw_ttl;
 583         break;
 584
 585     case MFF_IP_FRAG:
 586         value->u8 = flow->nw_frag;
 587         break;
 588
 589     case MFF_ARP_OP:
 590         value->be16 = htons(flow->nw_proto);
 591         break;
 592
 593     case MFF_ARP_SPA:
 594         value->be32 = flow->nw_src;
 595         break;
 596
 597     case MFF_ARP_TPA:
 598         value->be32 = flow->nw_dst;
 599         break;
 600
 601     case MFF_ARP_SHA:
 602     case MFF_ND_SLL:
 603         memcpy(value->mac, flow->arp_sha, ETH_ADDR_LEN);
 604         break;
 605
 606     case MFF_ARP_THA:
 607     case MFF_ND_TLL:
 608         memcpy(value->mac, flow->arp_tha, ETH_ADDR_LEN);
 609         break;
 610
 611     case MFF_TCP_SRC:
 612     case MFF_UDP_SRC:
 613     case MFF_SCTP_SRC:
 614         value->be16 = flow->tp_src;
 615         break;
 616
 617     case MFF_TCP_DST:
 618     case MFF_UDP_DST:
 619     case MFF_SCTP_DST:
 620         value->be16 = flow->tp_dst;
 621         break;
 622
 623     case MFF_TCP_FLAGS:
 624         value->be16 = flow->tcp_flags;
 625         break;
 626
 627     case MFF_ICMPV4_TYPE:
 628     case MFF_ICMPV6_TYPE:
 629         value->u8 = ntohs(flow->tp_src);
 630         break;
 631
 632     case MFF_ICMPV4_CODE:
 633     case MFF_ICMPV6_CODE:
 634         value->u8 = ntohs(flow->tp_dst);
 635         break;
 636
 637     case MFF_ND_TARGET:
 638         value->ipv6 = flow->nd_target;
 639         break;
 640
 641     case MFF_N_IDS:
 642     default:
 643         OVS_NOT_REACHED();
 644     }
 645 }
 646
 647 /* Makes 'match' match field 'mf' exactly, with the value matched taken from
 648  * 'value'.  The caller is responsible for ensuring that 'match' meets 'mf''s
 649  * prerequisites. */
 650 void
 651 mf_set_value(const struct mf_field *mf,
 652              const union mf_value *value, struct match *match)
 653 {
 654     switch (mf->id) {
 655     case MFF_DP_HASH:
 656         match_set_dp_hash(match, ntohl(value->be32));
 657         break;
 658     case MFF_RECIRC_ID:
 659         match_set_recirc_id(match, ntohl(value->be32));
 660         break;
 661     case MFF_TUN_ID:
 662         match_set_tun_id(match, value->be64);
 663         break;
 664     case MFF_TUN_SRC:
 665         match_set_tun_src(match, value->be32);
 666         break;
 667     case MFF_TUN_DST:
 668         match_set_tun_dst(match, value->be32);
 669         break;
 670     case MFF_TUN_FLAGS:
 671         match_set_tun_flags(match, ntohs(value->be16));
 672         break;
 673     case MFF_TUN_TOS:
 674         match_set_tun_tos(match, value->u8);
 675         break;
 676     case MFF_TUN_TTL:
 677         match_set_tun_ttl(match, value->u8);
 678         break;
 679
 680     case MFF_METADATA:
 681         match_set_metadata(match, value->be64);
 682         break;
 683
 684     case MFF_IN_PORT:
 685         match_set_in_port(match, u16_to_ofp(ntohs(value->be16)));
 686         break;
 687
 688     case MFF_IN_PORT_OXM: {
 689         ofp_port_t port;
 690         ofputil_port_from_ofp11(value->be32, &port);
 691         match_set_in_port(match, port);
 692         break;
 693     }
 694
 695     case MFF_SKB_PRIORITY:
 696         match_set_skb_priority(match, ntohl(value->be32));
 697         break;
 698
 699     case MFF_PKT_MARK:
 700         match_set_pkt_mark(match, ntohl(value->be32));
 701         break;
 702
 703     CASE_MFF_REGS:
 704         match_set_reg(match, mf->id - MFF_REG0, ntohl(value->be32));
 705         break;
 706
 707     CASE_MFF_XREGS:
 708         match_set_xreg(match, mf->id - MFF_XREG0, ntohll(value->be64));
 709         break;
 710
 711     case MFF_ETH_SRC:
 712         match_set_dl_src(match, value->mac);
 713         break;
 714
 715     case MFF_ETH_DST:
 716         match_set_dl_dst(match, value->mac);
 717         break;
 718
 719     case MFF_ETH_TYPE:
 720         match_set_dl_type(match, value->be16);
 721         break;
 722
 723     case MFF_VLAN_TCI:
 724         match_set_dl_tci(match, value->be16);
 725         break;
 726
 727     case MFF_DL_VLAN:
 728         match_set_dl_vlan(match, value->be16);
 729         break;
 730     case MFF_VLAN_VID:
 731         match_set_vlan_vid(match, value->be16);
 732         break;
 733
 734     case MFF_DL_VLAN_PCP:
 735     case MFF_VLAN_PCP:
 736         match_set_dl_vlan_pcp(match, value->u8);
 737         break;
 738
 739     case MFF_MPLS_LABEL:
 740         match_set_mpls_label(match, 0, value->be32);
 741         break;
 742
 743     case MFF_MPLS_TC:
 744         match_set_mpls_tc(match, 0, value->u8);
 745         break;
 746
 747     case MFF_MPLS_BOS:
 748         match_set_mpls_bos(match, 0, value->u8);
 749         break;
 750
 751     case MFF_IPV4_SRC:
 752         match_set_nw_src(match, value->be32);
 753         break;
 754
 755     case MFF_IPV4_DST:
 756         match_set_nw_dst(match, value->be32);
 757         break;
 758
 759     case MFF_IPV6_SRC:
 760         match_set_ipv6_src(match, &value->ipv6);
 761         break;
 762
 763     case MFF_IPV6_DST:
 764         match_set_ipv6_dst(match, &value->ipv6);
 765         break;
 766
 767     case MFF_IPV6_LABEL:
 768         match_set_ipv6_label(match, value->be32);
 769         break;
 770
 771     case MFF_IP_PROTO:
 772         match_set_nw_proto(match, value->u8);
 773         break;
 774
 775     case MFF_IP_DSCP:
 776         match_set_nw_dscp(match, value->u8);
 777         break;
 778
 779     case MFF_IP_DSCP_SHIFTED:
 780         match_set_nw_dscp(match, value->u8 << 2);
 781         break;
 782
 783     case MFF_IP_ECN:
 784         match_set_nw_ecn(match, value->u8);
 785         break;
 786
 787     case MFF_IP_TTL:
 788         match_set_nw_ttl(match, value->u8);
 789         break;
 790
 791     case MFF_IP_FRAG:
 792         match_set_nw_frag(match, value->u8);
 793         break;
 794
 795     case MFF_ARP_OP:
 796         match_set_nw_proto(match, ntohs(value->be16));
 797         break;
 798
 799     case MFF_ARP_SPA:
 800         match_set_nw_src(match, value->be32);
 801         break;
 802
 803     case MFF_ARP_TPA:
 804         match_set_nw_dst(match, value->be32);
 805         break;
 806
 807     case MFF_ARP_SHA:
 808     case MFF_ND_SLL:
 809         match_set_arp_sha(match, value->mac);
 810         break;
 811
 812     case MFF_ARP_THA:
 813     case MFF_ND_TLL:
 814         match_set_arp_tha(match, value->mac);
 815         break;
 816
 817     case MFF_TCP_SRC:
 818     case MFF_UDP_SRC:
 819     case MFF_SCTP_SRC:
 820         match_set_tp_src(match, value->be16);
 821         break;
 822
 823     case MFF_TCP_DST:
 824     case MFF_UDP_DST:
 825     case MFF_SCTP_DST:
 826         match_set_tp_dst(match, value->be16);
 827         break;
 828
 829     case MFF_TCP_FLAGS:
 830         match_set_tcp_flags(match, value->be16);
 831         break;
 832
 833     case MFF_ICMPV4_TYPE:
 834     case MFF_ICMPV6_TYPE:
 835         match_set_icmp_type(match, value->u8);
 836         break;
 837
 838     case MFF_ICMPV4_CODE:
 839     case MFF_ICMPV6_CODE:
 840         match_set_icmp_code(match, value->u8);
 841         break;
 842
 843     case MFF_ND_TARGET:
 844         match_set_nd_target(match, &value->ipv6);
 845         break;
 846
 847     case MFF_N_IDS:
 848     default:
 849         OVS_NOT_REACHED();
 850     }
 851 }
 852
 853 /* Unwildcard 'mask' member field described by 'mf'.  The caller is
 854  * responsible for ensuring that 'mask' meets 'mf''s prerequisites. */
 855 void
 856 mf_mask_field(const struct mf_field *mf, struct flow *mask)
 857 {
 858     static const union mf_value exact_match_mask = MF_EXACT_MASK_INITIALIZER;
 859
 860     /* For MFF_DL_VLAN, we cannot send a all 1's to flow_set_dl_vlan()
 861      * as that will be considered as OFP10_VLAN_NONE. So consider it as a
 862      * special case. For the rest, calling mf_set_flow_value() is good
 863      * enough. */
 864     if (mf->id == MFF_DL_VLAN) {
 865         flow_set_dl_vlan(mask, htons(VLAN_VID_MASK));
 866     } else {
 867         mf_set_flow_value(mf, &exact_match_mask, mask);
 868     }
 869 }
 870
 871 /* Sets 'flow' member field described by 'mf' to 'value'.  The caller is
 872  * responsible for ensuring that 'flow' meets 'mf''s prerequisites.*/
 873 void
 874 mf_set_flow_value(const struct mf_field *mf,
 875                   const union mf_value *value, struct flow *flow)
 876 {
 877     switch (mf->id) {
 878     case MFF_DP_HASH:
 879         flow->dp_hash = ntohl(value->be32);
 880         break;
 881     case MFF_RECIRC_ID:
 882         flow->recirc_id = ntohl(value->be32);
 883         break;
 884     case MFF_TUN_ID:
 885         flow->tunnel.tun_id = value->be64;
 886         break;
 887     case MFF_TUN_SRC:
 888         flow->tunnel.ip_src = value->be32;
 889         break;
 890     case MFF_TUN_DST:
 891         flow->tunnel.ip_dst = value->be32;
 892         break;
 893     case MFF_TUN_FLAGS:
 894         flow->tunnel.flags = ntohs(value->be16);
 895         break;
 896     case MFF_TUN_TOS:
 897         flow->tunnel.ip_tos = value->u8;
 898         break;
 899     case MFF_TUN_TTL:
 900         flow->tunnel.ip_ttl = value->u8;
 901         break;
 902
 903     case MFF_METADATA:
 904         flow->metadata = value->be64;
 905         break;
 906
 907     case MFF_IN_PORT:
 908         flow->in_port.ofp_port = u16_to_ofp(ntohs(value->be16));
 909         break;
 910
 911     case MFF_IN_PORT_OXM: {
 912         ofp_port_t port;
 913         ofputil_port_from_ofp11(value->be32, &port);
 914         flow->in_port.ofp_port = port;
 915         break;
 916     }
 917
 918     case MFF_SKB_PRIORITY:
 919         flow->skb_priority = ntohl(value->be32);
 920         break;
 921
 922     case MFF_PKT_MARK:
 923         flow->pkt_mark = ntohl(value->be32);
 924         break;
 925
 926     CASE_MFF_REGS:
 927         flow->regs[mf->id - MFF_REG0] = ntohl(value->be32);
 928         break;
 929
 930     CASE_MFF_XREGS:
 931         flow_set_xreg(flow, mf->id - MFF_XREG0, ntohll(value->be64));
 932         break;
 933
 934     case MFF_ETH_SRC:
 935         memcpy(flow->dl_src, value->mac, ETH_ADDR_LEN);
 936         break;
 937
 938     case MFF_ETH_DST:
 939         memcpy(flow->dl_dst, value->mac, ETH_ADDR_LEN);
 940         break;
 941
 942     case MFF_ETH_TYPE:
 943         flow->dl_type = value->be16;
 944         break;
 945
 946     case MFF_VLAN_TCI:
 947         flow->vlan_tci = value->be16;
 948         break;
 949
 950     case MFF_DL_VLAN:
 951         flow_set_dl_vlan(flow, value->be16);
 952         break;
 953     case MFF_VLAN_VID:
 954         flow_set_vlan_vid(flow, value->be16);
 955         break;
 956
 957     case MFF_DL_VLAN_PCP:
 958     case MFF_VLAN_PCP:
 959         flow_set_vlan_pcp(flow, value->u8);
 960         break;
 961
 962     case MFF_MPLS_LABEL:
 963         flow_set_mpls_label(flow, 0, value->be32);
 964         break;
 965
 966     case MFF_MPLS_TC:
 967         flow_set_mpls_tc(flow, 0, value->u8);
 968         break;
 969
 970     case MFF_MPLS_BOS:
 971         flow_set_mpls_bos(flow, 0, value->u8);
 972         break;
 973
 974     case MFF_IPV4_SRC:
 975         flow->nw_src = value->be32;
 976         break;
 977
 978     case MFF_IPV4_DST:
 979         flow->nw_dst = value->be32;
 980         break;
 981
 982     case MFF_IPV6_SRC:
 983         flow->ipv6_src = value->ipv6;
 984         break;
 985
 986     case MFF_IPV6_DST:
 987         flow->ipv6_dst = value->ipv6;
 988         break;
 989
 990     case MFF_IPV6_LABEL:
 991         flow->ipv6_label = value->be32 & ~htonl(IPV6_LABEL_MASK);
 992         break;
 993
 994     case MFF_IP_PROTO:
 995         flow->nw_proto = value->u8;
 996         break;
 997
 998     case MFF_IP_DSCP:
 999         flow->nw_tos &= ~IP_DSCP_MASK;
1000         flow->nw_tos |= value->u8 & IP_DSCP_MASK;
1001         break;
1002
1003     case MFF_IP_DSCP_SHIFTED:
1004         flow->nw_tos &= ~IP_DSCP_MASK;
1005         flow->nw_tos |= value->u8 << 2;
1006         break;
1007
1008     case MFF_IP_ECN:
1009         flow->nw_tos &= ~IP_ECN_MASK;
1010         flow->nw_tos |= value->u8 & IP_ECN_MASK;
1011         break;
1012
1013     case MFF_IP_TTL:
1014         flow->nw_ttl = value->u8;
1015         break;
1016
1017     case MFF_IP_FRAG:
1018         flow->nw_frag = value->u8 & FLOW_NW_FRAG_MASK;
1019         break;
1020
1021     case MFF_ARP_OP:
1022         flow->nw_proto = ntohs(value->be16);
1023         break;
1024
1025     case MFF_ARP_SPA:
1026         flow->nw_src = value->be32;
1027         break;
1028
1029     case MFF_ARP_TPA:
1030         flow->nw_dst = value->be32;
1031         break;
1032
1033     case MFF_ARP_SHA:
1034     case MFF_ND_SLL:
1035         memcpy(flow->arp_sha, value->mac, ETH_ADDR_LEN);
1036         break;
1037
1038     case MFF_ARP_THA:
1039     case MFF_ND_TLL:
1040         memcpy(flow->arp_tha, value->mac, ETH_ADDR_LEN);
1041         break;
1042
1043     case MFF_TCP_SRC:
1044     case MFF_UDP_SRC:
1045     case MFF_SCTP_SRC:
1046         flow->tp_src = value->be16;
1047         break;
1048
1049     case MFF_TCP_DST:
1050     case MFF_UDP_DST:
1051     case MFF_SCTP_DST:
1052         flow->tp_dst = value->be16;
1053         break;
1054
1055     case MFF_TCP_FLAGS:
1056         flow->tcp_flags = value->be16;
1057         break;
1058
1059     case MFF_ICMPV4_TYPE:
1060     case MFF_ICMPV6_TYPE:
1061         flow->tp_src = htons(value->u8);
1062         break;
1063
1064     case MFF_ICMPV4_CODE:
1065     case MFF_ICMPV6_CODE:
1066         flow->tp_dst = htons(value->u8);
1067         break;
1068
1069     case MFF_ND_TARGET:
1070         flow->nd_target = value->ipv6;
1071         break;
1072
1073     case MFF_N_IDS:
1074     default:
1075         OVS_NOT_REACHED();
1076     }
1077 }
1078
1079 /* Consider each of 'src', 'mask', and 'dst' as if they were arrays of 8*n
1080  * bits.  Then, for each 0 <= i < 8 * n such that mask[i] == 1, sets dst[i] =
1081  * src[i].  */
1082 static void
1083 apply_mask(const uint8_t *src, const uint8_t *mask, uint8_t *dst, size_t n)
1084 {
1085     size_t i;
1086
1087     for (i = 0; i < n; i++) {
1088         dst[i] = (src[i] & mask[i]) | (dst[i] & ~mask[i]);
1089     }
1090 }
1091
1092 /* Sets 'flow' member field described by 'field' to 'value', except that bits
1093  * for which 'mask' has a 0-bit keep their existing values.  The caller is
1094  * responsible for ensuring that 'flow' meets 'field''s prerequisites.*/
1095 void
1096 mf_set_flow_value_masked(const struct mf_field *field,
1097                          const union mf_value *value,
1098                          const union mf_value *mask,
1099                          struct flow *flow)
1100 {
1101     union mf_value tmp;
1102
1103     mf_get_value(field, flow, &tmp);
1104     apply_mask((const uint8_t *) value, (const uint8_t *) mask,
1105                (uint8_t *) &tmp, field->n_bytes);
1106     mf_set_flow_value(field, &tmp, flow);
1107 }
1108
1109 /* Returns true if 'mf' has a zero value in 'flow', false if it is nonzero.
1110  *
1111  * The caller is responsible for ensuring that 'flow' meets 'mf''s
1112  * prerequisites. */
1113 bool
1114 mf_is_zero(const struct mf_field *mf, const struct flow *flow)
1115 {
1116     union mf_value value;
1117
1118     mf_get_value(mf, flow, &value);
1119     return is_all_zeros(&value, mf->n_bytes);
1120 }
1121
1122 /* Makes 'match' wildcard field 'mf'.
1123  *
1124  * The caller is responsible for ensuring that 'match' meets 'mf''s
1125  * prerequisites. */
1126 void
1127 mf_set_wild(const struct mf_field *mf, struct match *match)
1128 {
1129     switch (mf->id) {
1130     case MFF_DP_HASH:
1131         match->flow.dp_hash = 0;
1132         match->wc.masks.dp_hash = 0;
1133         break;
1134     case MFF_RECIRC_ID:
1135         match->flow.recirc_id = 0;
1136         match->wc.masks.recirc_id = 0;
1137         break;
1138     case MFF_TUN_ID:
1139         match_set_tun_id_masked(match, htonll(0), htonll(0));
1140         break;
1141     case MFF_TUN_SRC:
1142         match_set_tun_src_masked(match, htonl(0), htonl(0));
1143         break;
1144     case MFF_TUN_DST:
1145         match_set_tun_dst_masked(match, htonl(0), htonl(0));
1146         break;
1147     case MFF_TUN_FLAGS:
1148         match_set_tun_flags_masked(match, 0, 0);
1149         break;
1150     case MFF_TUN_TOS:
1151         match_set_tun_tos_masked(match, 0, 0);
1152         break;
1153     case MFF_TUN_TTL:
1154         match_set_tun_ttl_masked(match, 0, 0);
1155         break;
1156
1157     case MFF_METADATA:
1158         match_set_metadata_masked(match, htonll(0), htonll(0));
1159         break;
1160
1161     case MFF_IN_PORT:
1162     case MFF_IN_PORT_OXM:
1163         match->flow.in_port.ofp_port = 0;
1164         match->wc.masks.in_port.ofp_port = 0;
1165         break;
1166
1167     case MFF_SKB_PRIORITY:
1168         match->flow.skb_priority = 0;
1169         match->wc.masks.skb_priority = 0;
1170         break;
1171
1172     case MFF_PKT_MARK:
1173         match->flow.pkt_mark = 0;
1174         match->wc.masks.pkt_mark = 0;
1175         break;
1176
1177     CASE_MFF_REGS:
1178         match_set_reg_masked(match, mf->id - MFF_REG0, 0, 0);
1179         break;
1180
1181     CASE_MFF_XREGS:
1182         match_set_xreg_masked(match, mf->id - MFF_XREG0, 0, 0);
1183         break;
1184
1185     case MFF_ETH_SRC:
1186         memset(match->flow.dl_src, 0, ETH_ADDR_LEN);
1187         memset(match->wc.masks.dl_src, 0, ETH_ADDR_LEN);
1188         break;
1189
1190     case MFF_ETH_DST:
1191         memset(match->flow.dl_dst, 0, ETH_ADDR_LEN);
1192         memset(match->wc.masks.dl_dst, 0, ETH_ADDR_LEN);
1193         break;
1194
1195     case MFF_ETH_TYPE:
1196         match->flow.dl_type = htons(0);
1197         match->wc.masks.dl_type = htons(0);
1198         break;
1199
1200     case MFF_VLAN_TCI:
1201         match_set_dl_tci_masked(match, htons(0), htons(0));
1202         break;
1203
1204     case MFF_DL_VLAN:
1205     case MFF_VLAN_VID:
1206         match_set_any_vid(match);
1207         break;
1208
1209     case MFF_DL_VLAN_PCP:
1210     case MFF_VLAN_PCP:
1211         match_set_any_pcp(match);
1212         break;
1213
1214     case MFF_MPLS_LABEL:
1215         match_set_any_mpls_label(match, 0);
1216         break;
1217
1218     case MFF_MPLS_TC:
1219         match_set_any_mpls_tc(match, 0);
1220         break;
1221
1222     case MFF_MPLS_BOS:
1223         match_set_any_mpls_bos(match, 0);
1224         break;
1225
1226     case MFF_IPV4_SRC:
1227     case MFF_ARP_SPA:
1228         match_set_nw_src_masked(match, htonl(0), htonl(0));
1229         break;
1230
1231     case MFF_IPV4_DST:
1232     case MFF_ARP_TPA:
1233         match_set_nw_dst_masked(match, htonl(0), htonl(0));
1234         break;
1235
1236     case MFF_IPV6_SRC:
1237         memset(&match->wc.masks.ipv6_src, 0, sizeof match->wc.masks.ipv6_src);
1238         memset(&match->flow.ipv6_src, 0, sizeof match->flow.ipv6_src);
1239         break;
1240
1241     case MFF_IPV6_DST:
1242         memset(&match->wc.masks.ipv6_dst, 0, sizeof match->wc.masks.ipv6_dst);
1243         memset(&match->flow.ipv6_dst, 0, sizeof match->flow.ipv6_dst);
1244         break;
1245
1246     case MFF_IPV6_LABEL:
1247         match->wc.masks.ipv6_label = htonl(0);
1248         match->flow.ipv6_label = htonl(0);
1249         break;
1250
1251     case MFF_IP_PROTO:
1252         match->wc.masks.nw_proto = 0;
1253         match->flow.nw_proto = 0;
1254         break;
1255
1256     case MFF_IP_DSCP:
1257     case MFF_IP_DSCP_SHIFTED:
1258         match->wc.masks.nw_tos &= ~IP_DSCP_MASK;
1259         match->flow.nw_tos &= ~IP_DSCP_MASK;
1260         break;
1261
1262     case MFF_IP_ECN:
1263         match->wc.masks.nw_tos &= ~IP_ECN_MASK;
1264         match->flow.nw_tos &= ~IP_ECN_MASK;
1265         break;
1266
1267     case MFF_IP_TTL:
1268         match->wc.masks.nw_ttl = 0;
1269         match->flow.nw_ttl = 0;
1270         break;
1271
1272     case MFF_IP_FRAG:
1273         match->wc.masks.nw_frag |= FLOW_NW_FRAG_MASK;
1274         match->flow.nw_frag &= ~FLOW_NW_FRAG_MASK;
1275         break;
1276
1277     case MFF_ARP_OP:
1278         match->wc.masks.nw_proto = 0;
1279         match->flow.nw_proto = 0;
1280         break;
1281
1282     case MFF_ARP_SHA:
1283     case MFF_ND_SLL:
1284         memset(match->flow.arp_sha, 0, ETH_ADDR_LEN);
1285         memset(match->wc.masks.arp_sha, 0, ETH_ADDR_LEN);
1286         break;
1287
1288     case MFF_ARP_THA:
1289     case MFF_ND_TLL:
1290         memset(match->flow.arp_tha, 0, ETH_ADDR_LEN);
1291         memset(match->wc.masks.arp_tha, 0, ETH_ADDR_LEN);
1292         break;
1293
1294     case MFF_TCP_SRC:
1295     case MFF_UDP_SRC:
1296     case MFF_SCTP_SRC:
1297     case MFF_ICMPV4_TYPE:
1298     case MFF_ICMPV6_TYPE:
1299         match->wc.masks.tp_src = htons(0);
1300         match->flow.tp_src = htons(0);
1301         break;
1302
1303     case MFF_TCP_DST:
1304     case MFF_UDP_DST:
1305     case MFF_SCTP_DST:
1306     case MFF_ICMPV4_CODE:
1307     case MFF_ICMPV6_CODE:
1308         match->wc.masks.tp_dst = htons(0);
1309         match->flow.tp_dst = htons(0);
1310         break;
1311
1312     case MFF_TCP_FLAGS:
1313         match->wc.masks.tcp_flags = htons(0);
1314         match->flow.tcp_flags = htons(0);
1315         break;
1316
1317     case MFF_ND_TARGET:
1318         memset(&match->wc.masks.nd_target, 0,
1319                sizeof match->wc.masks.nd_target);
1320         memset(&match->flow.nd_target, 0, sizeof match->flow.nd_target);
1321         break;
1322
1323     case MFF_N_IDS:
1324     default:
1325         OVS_NOT_REACHED();
1326     }
1327 }
1328
1329 /* Makes 'match' match field 'mf' with the specified 'value' and 'mask'.
1330  * 'value' specifies a value to match and 'mask' specifies a wildcard pattern,
1331  * with a 1-bit indicating that the corresponding value bit must match and a
1332  * 0-bit indicating a don't-care.
1333  *
1334  * If 'mask' is NULL or points to all-1-bits, then this call is equivalent to
1335  * mf_set_value(mf, value, match).  If 'mask' points to all-0-bits, then this
1336  * call is equivalent to mf_set_wild(mf, match).
1337  *
1338  * 'mask' must be a valid mask for 'mf' (see mf_is_mask_valid()).  The caller
1339  * is responsible for ensuring that 'match' meets 'mf''s prerequisites. */
1340 enum ofputil_protocol
1341 mf_set(const struct mf_field *mf,
1342        const union mf_value *value, const union mf_value *mask,
1343        struct match *match)
1344 {
1345     if (!mask || is_all_ones(mask, mf->n_bytes)) {
1346         mf_set_value(mf, value, match);
1347         return mf->usable_protocols_exact;
1348     } else if (is_all_zeros(mask, mf->n_bytes)) {
1349         mf_set_wild(mf, match);
1350         return OFPUTIL_P_ANY;
1351     }
1352
1353     switch (mf->id) {
1354     case MFF_RECIRC_ID:
1355     case MFF_IN_PORT:
1356     case MFF_IN_PORT_OXM:
1357     case MFF_SKB_PRIORITY:
1358     case MFF_ETH_TYPE:
1359     case MFF_DL_VLAN:
1360     case MFF_DL_VLAN_PCP:
1361     case MFF_VLAN_PCP:
1362     case MFF_MPLS_LABEL:
1363     case MFF_MPLS_TC:
1364     case MFF_MPLS_BOS:
1365     case MFF_IP_PROTO:
1366     case MFF_IP_TTL:
1367     case MFF_IP_DSCP:
1368     case MFF_IP_DSCP_SHIFTED:
1369     case MFF_IP_ECN:
1370     case MFF_ARP_OP:
1371     case MFF_ICMPV4_TYPE:
1372     case MFF_ICMPV4_CODE:
1373     case MFF_ICMPV6_TYPE:
1374     case MFF_ICMPV6_CODE:
1375         return OFPUTIL_P_NONE;
1376
1377     case MFF_DP_HASH:
1378         match_set_dp_hash_masked(match, ntohl(value->be32), ntohl(mask->be32));
1379         break;
1380     case MFF_TUN_ID:
1381         match_set_tun_id_masked(match, value->be64, mask->be64);
1382         break;
1383     case MFF_TUN_SRC:
1384         match_set_tun_src_masked(match, value->be32, mask->be32);
1385         break;
1386     case MFF_TUN_DST:
1387         match_set_tun_dst_masked(match, value->be32, mask->be32);
1388         break;
1389     case MFF_TUN_FLAGS:
1390         match_set_tun_flags_masked(match, ntohs(value->be16), ntohs(mask->be16));
1391         break;
1392     case MFF_TUN_TTL:
1393         match_set_tun_ttl_masked(match, value->u8, mask->u8);
1394         break;
1395     case MFF_TUN_TOS:
1396         match_set_tun_tos_masked(match, value->u8, mask->u8);
1397         break;
1398
1399     case MFF_METADATA:
1400         match_set_metadata_masked(match, value->be64, mask->be64);
1401         break;
1402
1403     CASE_MFF_REGS:
1404         match_set_reg_masked(match, mf->id - MFF_REG0,
1405                              ntohl(value->be32), ntohl(mask->be32));
1406         break;
1407
1408     CASE_MFF_XREGS:
1409         match_set_xreg_masked(match, mf->id - MFF_XREG0,
1410                               ntohll(value->be64), ntohll(mask->be64));
1411         break;
1412
1413     case MFF_PKT_MARK:
1414         match_set_pkt_mark_masked(match, ntohl(value->be32),
1415                                   ntohl(mask->be32));
1416         break;
1417
1418     case MFF_ETH_DST:
1419         match_set_dl_dst_masked(match, value->mac, mask->mac);
1420         break;
1421
1422     case MFF_ETH_SRC:
1423         match_set_dl_src_masked(match, value->mac, mask->mac);
1424         break;
1425
1426     case MFF_ARP_SHA:
1427     case MFF_ND_SLL:
1428         match_set_arp_sha_masked(match, value->mac, mask->mac);
1429         break;
1430
1431     case MFF_ARP_THA:
1432     case MFF_ND_TLL:
1433         match_set_arp_tha_masked(match, value->mac, mask->mac);
1434         break;
1435
1436     case MFF_VLAN_TCI:
1437         match_set_dl_tci_masked(match, value->be16, mask->be16);
1438         break;
1439
1440     case MFF_VLAN_VID:
1441         match_set_vlan_vid_masked(match, value->be16, mask->be16);
1442         break;
1443
1444     case MFF_IPV4_SRC:
1445         match_set_nw_src_masked(match, value->be32, mask->be32);
1446         break;
1447
1448     case MFF_IPV4_DST:
1449         match_set_nw_dst_masked(match, value->be32, mask->be32);
1450         break;
1451
1452     case MFF_IPV6_SRC:
1453         match_set_ipv6_src_masked(match, &value->ipv6, &mask->ipv6);
1454         break;
1455
1456     case MFF_IPV6_DST:
1457         match_set_ipv6_dst_masked(match, &value->ipv6, &mask->ipv6);
1458         break;
1459
1460     case MFF_IPV6_LABEL:
1461         if ((mask->be32 & htonl(IPV6_LABEL_MASK)) == htonl(IPV6_LABEL_MASK)) {
1462             mf_set_value(mf, value, match);
1463         } else {
1464             match_set_ipv6_label_masked(match, value->be32, mask->be32);
1465         }
1466         break;
1467
1468     case MFF_ND_TARGET:
1469         match_set_nd_target_masked(match, &value->ipv6, &mask->ipv6);
1470         break;
1471
1472     case MFF_IP_FRAG:
1473         match_set_nw_frag_masked(match, value->u8, mask->u8);
1474         break;
1475
1476     case MFF_ARP_SPA:
1477         match_set_nw_src_masked(match, value->be32, mask->be32);
1478         break;
1479
1480     case MFF_ARP_TPA:
1481         match_set_nw_dst_masked(match, value->be32, mask->be32);
1482         break;
1483
1484     case MFF_TCP_SRC:
1485     case MFF_UDP_SRC:
1486     case MFF_SCTP_SRC:
1487         match_set_tp_src_masked(match, value->be16, mask->be16);
1488         break;
1489
1490     case MFF_TCP_DST:
1491     case MFF_UDP_DST:
1492     case MFF_SCTP_DST:
1493         match_set_tp_dst_masked(match, value->be16, mask->be16);
1494         break;
1495
1496     case MFF_TCP_FLAGS:
1497         match_set_tcp_flags_masked(match, value->be16, mask->be16);
1498         break;
1499
1500     case MFF_N_IDS:
1501     default:
1502         OVS_NOT_REACHED();
1503     }
1504
1505     return ((mf->usable_protocols_bitwise == mf->usable_protocols_cidr
1506              || ip_is_cidr(mask->be32))
1507             ? mf->usable_protocols_cidr
1508             : mf->usable_protocols_bitwise);
1509 }
1510
1511 static enum ofperr
1512 mf_check__(const struct mf_subfield *sf, const struct flow *flow,
1513            const char *type)
1514 {
1515     if (!sf->field) {
1516         VLOG_WARN_RL(&rl, "unknown %s field", type);
1517         return OFPERR_OFPBAC_BAD_SET_TYPE;
1518     } else if (!sf->n_bits) {
1519         VLOG_WARN_RL(&rl, "zero bit %s field %s", type, sf->field->name);
1520         return OFPERR_OFPBAC_BAD_SET_LEN;
1521     } else if (sf->ofs >= sf->field->n_bits) {
1522         VLOG_WARN_RL(&rl, "bit offset %d exceeds %d-bit width of %s field %s",
1523                      sf->ofs, sf->field->n_bits, type, sf->field->name);
1524         return OFPERR_OFPBAC_BAD_SET_LEN;
1525     } else if (sf->ofs + sf->n_bits > sf->field->n_bits) {
1526         VLOG_WARN_RL(&rl, "bit offset %d and width %d exceeds %d-bit width "
1527                      "of %s field %s", sf->ofs, sf->n_bits,
1528                      sf->field->n_bits, type, sf->field->name);
1529         return OFPERR_OFPBAC_BAD_SET_LEN;
1530     } else if (flow && !mf_are_prereqs_ok(sf->field, flow)) {
1531         VLOG_WARN_RL(&rl, "%s field %s lacks correct prerequisites",
1532                      type, sf->field->name);
1533         return OFPERR_OFPBAC_MATCH_INCONSISTENT;
1534     } else {
1535         return 0;
1536     }
1537 }
1538
1539 /* Checks whether 'sf' is valid for reading a subfield out of 'flow'.  Returns
1540  * 0 if so, otherwise an OpenFlow error code (e.g. as returned by
1541  * ofp_mkerr()).  */
1542 enum ofperr
1543 mf_check_src(const struct mf_subfield *sf, const struct flow *flow)
1544 {
1545     return mf_check__(sf, flow, "source");
1546 }
1547
1548 /* Checks whether 'sf' is valid for writing a subfield into 'flow'.  Returns 0
1549  * if so, otherwise an OpenFlow error code (e.g. as returned by
1550  * ofp_mkerr()). */
1551 enum ofperr
1552 mf_check_dst(const struct mf_subfield *sf, const struct flow *flow)
1553 {
1554     int error = mf_check__(sf, flow, "destination");
1555     if (!error && !sf->field->writable) {
1556         VLOG_WARN_RL(&rl, "destination field %s is not writable",
1557                      sf->field->name);
1558         return OFPERR_OFPBAC_BAD_SET_ARGUMENT;
1559     }
1560     return error;
1561 }
1562
1563 /* Copies the value and wildcard bit pattern for 'mf' from 'match' into the
1564  * 'value' and 'mask', respectively. */
1565 void
1566 mf_get(const struct mf_field *mf, const struct match *match,
1567        union mf_value *value, union mf_value *mask)
1568 {
1569     mf_get_value(mf, &match->flow, value);
1570     mf_get_mask(mf, &match->wc, mask);
1571 }
1572
1573 static char *
1574 mf_from_integer_string(const struct mf_field *mf, const char *s,
1575                        uint8_t *valuep, uint8_t *maskp)
1576 {
1577     unsigned long long int integer, mask;
1578     char *tail;
1579     int i;
1580
1581     errno = 0;
1582     integer = strtoull(s, &tail, 0);
1583     if (errno || (*tail != '\0' && *tail != '/')) {
1584         goto syntax_error;
1585     }
1586
1587     if (*tail == '/') {
1588         mask = strtoull(tail + 1, &tail, 0);
1589         if (errno || *tail != '\0') {
1590             goto syntax_error;
1591         }
1592     } else {
1593         mask = ULLONG_MAX;
1594     }
1595
1596     for (i = mf->n_bytes - 1; i >= 0; i--) {
1597         valuep[i] = integer;
1598         maskp[i] = mask;
1599         integer >>= 8;
1600         mask >>= 8;
1601     }
1602     if (integer) {
1603         return xasprintf("%s: value too large for %u-byte field %s",
1604                          s, mf->n_bytes, mf->name);
1605     }
1606     return NULL;
1607
1608 syntax_error:
1609     return xasprintf("%s: bad syntax for %s", s, mf->name);
1610 }
1611
1612 static char *
1613 mf_from_ethernet_string(const struct mf_field *mf, const char *s,
1614                         uint8_t mac[ETH_ADDR_LEN],
1615                         uint8_t mask[ETH_ADDR_LEN])
1616 {
1617     int n;
1618
1619     ovs_assert(mf->n_bytes == ETH_ADDR_LEN);
1620
1621     n = -1;
1622     if (ovs_scan(s, ETH_ADDR_SCAN_FMT"%n", ETH_ADDR_SCAN_ARGS(mac), &n)
1623         && n == strlen(s)) {
1624         memset(mask, 0xff, ETH_ADDR_LEN);
1625         return NULL;
1626     }
1627
1628     n = -1;
1629     if (ovs_scan(s, ETH_ADDR_SCAN_FMT"/"ETH_ADDR_SCAN_FMT"%n",
1630                  ETH_ADDR_SCAN_ARGS(mac), ETH_ADDR_SCAN_ARGS(mask), &n)
1631         && n == strlen(s)) {
1632         return NULL;
1633     }
1634
1635     return xasprintf("%s: invalid Ethernet address", s);
1636 }
1637
1638 static char *
1639 mf_from_ipv4_string(const struct mf_field *mf, const char *s,
1640                     ovs_be32 *ip, ovs_be32 *mask)
1641 {
1642     int prefix;
1643
1644     ovs_assert(mf->n_bytes == sizeof *ip);
1645
1646     if (ovs_scan(s, IP_SCAN_FMT"/"IP_SCAN_FMT,
1647                  IP_SCAN_ARGS(ip), IP_SCAN_ARGS(mask))) {
1648         /* OK. */
1649     } else if (ovs_scan(s, IP_SCAN_FMT"/%d", IP_SCAN_ARGS(ip), &prefix)) {
1650         if (prefix <= 0 || prefix > 32) {
1651             return xasprintf("%s: network prefix bits not between 1 and "
1652                              "32", s);
1653         } else if (prefix == 32) {
1654             *mask = OVS_BE32_MAX;
1655         } else {
1656             *mask = htonl(((1u << prefix) - 1) << (32 - prefix));
1657         }
1658     } else if (ovs_scan(s, IP_SCAN_FMT, IP_SCAN_ARGS(ip))) {
1659         *mask = OVS_BE32_MAX;
1660     } else {
1661         return xasprintf("%s: invalid IP address", s);
1662     }
1663     return NULL;
1664 }
1665
1666 static char *
1667 mf_from_ipv6_string(const struct mf_field *mf, const char *s,
1668                     struct in6_addr *value, struct in6_addr *mask)
1669 {
1670     char *str = xstrdup(s);
1671     char *save_ptr = NULL;
1672     const char *name, *netmask;
1673     int retval;
1674
1675     ovs_assert(mf->n_bytes == sizeof *value);
1676
1677     name = strtok_r(str, "/", &save_ptr);
1678     retval = name ? lookup_ipv6(name, value) : EINVAL;
1679     if (retval) {
1680         char *err;
1681
1682         err = xasprintf("%s: could not convert to IPv6 address", str);
1683         free(str);
1684
1685         return err;
1686     }
1687
1688     netmask = strtok_r(NULL, "/", &save_ptr);
1689     if (netmask) {
1690         if (inet_pton(AF_INET6, netmask, mask) != 1) {
1691             int prefix = atoi(netmask);
1692             if (prefix <= 0 || prefix > 128) {
1693                 free(str);
1694                 return xasprintf("%s: prefix bits not between 1 and 128", s);
1695             } else {
1696                 *mask = ipv6_create_mask(prefix);
1697             }
1698         }
1699     } else {
1700         *mask = in6addr_exact;
1701     }
1702     free(str);
1703
1704     return NULL;
1705 }
1706
1707 static char *
1708 mf_from_ofp_port_string(const struct mf_field *mf, const char *s,
1709                         ovs_be16 *valuep, ovs_be16 *maskp)
1710 {
1711     ofp_port_t port;
1712
1713     ovs_assert(mf->n_bytes == sizeof(ovs_be16));
1714
1715     if (ofputil_port_from_string(s, &port)) {
1716         *valuep = htons(ofp_to_u16(port));
1717         *maskp = OVS_BE16_MAX;
1718         return NULL;
1719     }
1720     return xasprintf("%s: port value out of range for %s", s, mf->name);
1721 }
1722
1723 static char *
1724 mf_from_ofp_port_string32(const struct mf_field *mf, const char *s,
1725                           ovs_be32 *valuep, ovs_be32 *maskp)
1726 {
1727     ofp_port_t port;
1728
1729     ovs_assert(mf->n_bytes == sizeof(ovs_be32));
1730     if (ofputil_port_from_string(s, &port)) {
1731         *valuep = ofputil_port_to_ofp11(port);
1732         *maskp = OVS_BE32_MAX;
1733         return NULL;
1734     }
1735     return xasprintf("%s: port value out of range for %s", s, mf->name);
1736 }
1737
1738 struct frag_handling {
1739     const char *name;
1740     uint8_t mask;
1741     uint8_t value;
1742 };
1743
1744 static const struct frag_handling all_frags[] = {
1745 #define A FLOW_NW_FRAG_ANY
1746 #define L FLOW_NW_FRAG_LATER
1747     /* name               mask  value */
1748
1749     { "no",               A|L,  0     },
1750     { "first",            A|L,  A     },
1751     { "later",            A|L,  A|L   },
1752
1753     { "no",               A,    0     },
1754     { "yes",              A,    A     },
1755
1756     { "not_later",        L,    0     },
1757     { "later",            L,    L     },
1758 #undef A
1759 #undef L
1760 };
1761
1762 static char *
1763 mf_from_frag_string(const char *s, uint8_t *valuep, uint8_t *maskp)
1764 {
1765     const struct frag_handling *h;
1766
1767     for (h = all_frags; h < &all_frags[ARRAY_SIZE(all_frags)]; h++) {
1768         if (!strcasecmp(s, h->name)) {
1769             /* We force the upper bits of the mask on to make mf_parse_value()
1770              * happy (otherwise it will never think it's an exact match.) */
1771             *maskp = h->mask | ~FLOW_NW_FRAG_MASK;
1772             *valuep = h->value;
1773             return NULL;
1774         }
1775     }
1776
1777     return xasprintf("%s: unknown fragment type (valid types are \"no\", "
1778                      "\"yes\", \"first\", \"later\", \"not_first\"", s);
1779 }
1780
1781 static int
1782 parse_flow_tun_flags(const char *s_, const char *(*bit_to_string)(uint32_t),
1783                      ovs_be16 *res)
1784 {
1785     uint32_t result = 0;
1786     char *save_ptr = NULL;
1787     char *name;
1788     int rc = 0;
1789     char *s = xstrdup(s_);
1790
1791     for (name = strtok_r((char *)s, " |", &save_ptr); name;
1792          name = strtok_r(NULL, " |", &save_ptr)) {
1793         int name_len;
1794         unsigned long long int flags;
1795         uint32_t bit;
1796
1797         if (ovs_scan(name, "%lli", &flags)) {
1798             result |= flags;
1799             continue;
1800         }
1801         name_len = strlen(name);
1802         for (bit = 1; bit; bit <<= 1) {
1803             const char *fname = bit_to_string(bit);
1804             size_t len;
1805
1806             if (!fname) {
1807                 continue;
1808             }
1809
1810             len = strlen(fname);
1811             if (len != name_len) {
1812                 continue;
1813             }
1814             if (!strncmp(name, fname, len)) {
1815                 result |= bit;
1816                 break;
1817             }
1818         }
1819
1820         if (!bit) {
1821             rc = -ENOENT;
1822             goto out;
1823         }
1824     }
1825
1826     *res = htons(result);
1827 out:
1828     free(s);
1829     return rc;
1830 }
1831
1832 static char *
1833 mf_from_tun_flags_string(const char *s, ovs_be16 *valuep, ovs_be16 *maskp)
1834 {
1835     if (!parse_flow_tun_flags(s, flow_tun_flag_to_string, valuep)) {
1836         *maskp = OVS_BE16_MAX;
1837         return NULL;
1838     }
1839
1840     return xasprintf("%s: unknown tunnel flags (valid flags are \"df\", "
1841                      "\"csum\", \"key\")", s);
1842 }
1843
1844 static char *
1845 mf_from_tcp_flags_string(const char *s, ovs_be16 *flagsp, ovs_be16 *maskp)
1846 {
1847     uint16_t flags = 0;
1848     uint16_t mask = 0;
1849     uint16_t bit;
1850     int n;
1851
1852     if (ovs_scan(s, "%"SCNi16"/%"SCNi16"%n", &flags, &mask, &n) && !s[n]) {
1853         *flagsp = htons(flags);
1854         *maskp = htons(mask);
1855         return NULL;
1856     }
1857     if (ovs_scan(s, "%"SCNi16"%n", &flags, &n) && !s[n]) {
1858         *flagsp = htons(flags);
1859         *maskp = OVS_BE16_MAX;
1860         return NULL;
1861     }
1862
1863     while (*s != '\0') {
1864         bool set;
1865         int name_len;
1866
1867         switch (*s) {
1868         case '+':
1869             set = true;
1870             break;
1871         case '-':
1872             set = false;
1873             break;
1874         default:
1875             return xasprintf("%s: TCP flag must be preceded by '+' (for SET) "
1876                              "or '-' (NOT SET)", s);
1877         }
1878         s++;
1879
1880         name_len = strcspn(s,"+-");
1881
1882         for (bit = 1; bit; bit <<= 1) {
1883             const char *fname = packet_tcp_flag_to_string(bit);
1884             size_t len;
1885
1886             if (!fname) {
1887                 continue;
1888             }
1889
1890             len = strlen(fname);
1891             if (len != name_len) {
1892                 continue;
1893             }
1894             if (!strncmp(s, fname, len)) {
1895                 if (mask & bit) {
1896                     return xasprintf("%s: Each TCP flag can be specified only "
1897                                      "once", s);
1898                 }
1899                 if (set) {
1900                     flags |= bit;
1901                 }
1902                 mask |= bit;
1903                 break;
1904             }
1905         }
1906
1907         if (!bit) {
1908             return xasprintf("%s: unknown TCP flag(s)", s);
1909         }
1910         s += name_len;
1911     }
1912
1913     *flagsp = htons(flags);
1914     *maskp = htons(mask);
1915     return NULL;
1916 }
1917
1918
1919 /* Parses 's', a string value for field 'mf', into 'value' and 'mask'.  Returns
1920  * NULL if successful, otherwise a malloc()'d string describing the error. */
1921 char *
1922 mf_parse(const struct mf_field *mf, const char *s,
1923          union mf_value *value, union mf_value *mask)
1924 {
1925     char *error;
1926
1927     if (!strcmp(s, "*")) {
1928         memset(value, 0, mf->n_bytes);
1929         memset(mask, 0, mf->n_bytes);
1930         return NULL;
1931     }
1932
1933     switch (mf->string) {
1934     case MFS_DECIMAL:
1935     case MFS_HEXADECIMAL:
1936         error = mf_from_integer_string(mf, s,
1937                                        (uint8_t *) value, (uint8_t *) mask);
1938         break;
1939
1940     case MFS_ETHERNET:
1941         error = mf_from_ethernet_string(mf, s, value->mac, mask->mac);
1942         break;
1943
1944     case MFS_IPV4:
1945         error = mf_from_ipv4_string(mf, s, &value->be32, &mask->be32);
1946         break;
1947
1948     case MFS_IPV6:
1949         error = mf_from_ipv6_string(mf, s, &value->ipv6, &mask->ipv6);
1950         break;
1951
1952     case MFS_OFP_PORT:
1953         error = mf_from_ofp_port_string(mf, s, &value->be16, &mask->be16);
1954         break;
1955
1956     case MFS_OFP_PORT_OXM:
1957         error = mf_from_ofp_port_string32(mf, s, &value->be32, &mask->be32);
1958         break;
1959
1960     case MFS_FRAG:
1961         error = mf_from_frag_string(s, &value->u8, &mask->u8);
1962         break;
1963
1964     case MFS_TNL_FLAGS:
1965         ovs_assert(mf->n_bytes == sizeof(ovs_be16));
1966         error = mf_from_tun_flags_string(s, &value->be16, &mask->be16);
1967         break;
1968
1969     case MFS_TCP_FLAGS:
1970         ovs_assert(mf->n_bytes == sizeof(ovs_be16));
1971         error = mf_from_tcp_flags_string(s, &value->be16, &mask->be16);
1972         break;
1973
1974     default:
1975         OVS_NOT_REACHED();
1976     }
1977
1978     if (!error && !mf_is_mask_valid(mf, mask)) {
1979         error = xasprintf("%s: invalid mask for field %s", s, mf->name);
1980     }
1981     return error;
1982 }
1983
1984 /* Parses 's', a string value for field 'mf', into 'value'.  Returns NULL if
1985  * successful, otherwise a malloc()'d string describing the error. */
1986 char *
1987 mf_parse_value(const struct mf_field *mf, const char *s, union mf_value *value)
1988 {
1989     union mf_value mask;
1990     char *error;
1991
1992     error = mf_parse(mf, s, value, &mask);
1993     if (error) {
1994         return error;
1995     }
1996
1997     if (!is_all_ones((const uint8_t *) &mask, mf->n_bytes)) {
1998         return xasprintf("%s: wildcards not allowed here", s);
1999     }
2000     return NULL;
2001 }
2002
2003 static void
2004 mf_format_integer_string(const struct mf_field *mf, const uint8_t *valuep,
2005                          const uint8_t *maskp, struct ds *s)
2006 {
2007     unsigned long long int integer;
2008     int i;
2009
2010     ovs_assert(mf->n_bytes <= 8);
2011
2012     integer = 0;
2013     for (i = 0; i < mf->n_bytes; i++) {
2014         integer = (integer << 8) | valuep[i];
2015     }
2016     if (mf->string == MFS_HEXADECIMAL) {
2017         ds_put_format(s, "%#llx", integer);
2018     } else {
2019         ds_put_format(s, "%lld", integer);
2020     }
2021
2022     if (maskp) {
2023         unsigned long long int mask;
2024
2025         mask = 0;
2026         for (i = 0; i < mf->n_bytes; i++) {
2027             mask = (mask << 8) | maskp[i];
2028         }
2029
2030         /* I guess we could write the mask in decimal for MFS_DECIMAL but I'm
2031          * not sure that that a bit-mask written in decimal is ever easier to
2032          * understand than the same bit-mask written in hexadecimal. */
2033         ds_put_format(s, "/%#llx", mask);
2034     }
2035 }
2036
2037 static void
2038 mf_format_frag_string(uint8_t value, uint8_t mask, struct ds *s)
2039 {
2040     const struct frag_handling *h;
2041
2042     mask &= FLOW_NW_FRAG_MASK;
2043     value &= mask;
2044
2045     for (h = all_frags; h < &all_frags[ARRAY_SIZE(all_frags)]; h++) {
2046         if (value == h->value && mask == h->mask) {
2047             ds_put_cstr(s, h->name);
2048             return;
2049         }
2050     }
2051     ds_put_cstr(s, "<error>");
2052 }
2053
2054 static void
2055 mf_format_tnl_flags_string(const ovs_be16 *valuep, struct ds *s)
2056 {
2057     format_flags(s, flow_tun_flag_to_string, ntohs(*valuep), '|');
2058 }
2059
2060 static void
2061 mf_format_tcp_flags_string(ovs_be16 value, ovs_be16 mask, struct ds *s)
2062 {
2063     format_flags_masked(s, NULL, packet_tcp_flag_to_string, ntohs(value),
2064                         TCP_FLAGS(mask));
2065 }
2066
2067 /* Appends to 's' a string representation of field 'mf' whose value is in
2068  * 'value' and 'mask'.  'mask' may be NULL to indicate an exact match. */
2069 void
2070 mf_format(const struct mf_field *mf,
2071           const union mf_value *value, const union mf_value *mask,
2072           struct ds *s)
2073 {
2074     if (mask) {
2075         if (is_all_zeros(mask, mf->n_bytes)) {
2076             ds_put_cstr(s, "ANY");
2077             return;
2078         } else if (is_all_ones(mask, mf->n_bytes)) {
2079             mask = NULL;
2080         }
2081     }
2082
2083     switch (mf->string) {
2084     case MFS_OFP_PORT_OXM:
2085         if (!mask) {
2086             ofp_port_t port;
2087             ofputil_port_from_ofp11(value->be32, &port);
2088             ofputil_format_port(port, s);
2089             break;
2090         }
2091         /* fall through */
2092     case MFS_OFP_PORT:
2093         if (!mask) {
2094             ofputil_format_port(u16_to_ofp(ntohs(value->be16)), s);
2095             break;
2096         }
2097         /* fall through */
2098     case MFS_DECIMAL:
2099     case MFS_HEXADECIMAL:
2100         mf_format_integer_string(mf, (uint8_t *) value, (uint8_t *) mask, s);
2101         break;
2102
2103     case MFS_ETHERNET:
2104         eth_format_masked(value->mac, mask->mac, s);
2105         break;
2106
2107     case MFS_IPV4:
2108         ip_format_masked(value->be32, mask ? mask->be32 : OVS_BE32_MAX, s);
2109         break;
2110
2111     case MFS_IPV6:
2112         print_ipv6_masked(s, &value->ipv6, mask ? &mask->ipv6 : NULL);
2113         break;
2114
2115     case MFS_FRAG:
2116         mf_format_frag_string(value->u8, mask ? mask->u8 : UINT8_MAX, s);
2117         break;
2118
2119     case MFS_TNL_FLAGS:
2120         mf_format_tnl_flags_string(&value->be16, s);
2121         break;
2122
2123     case MFS_TCP_FLAGS:
2124         mf_format_tcp_flags_string(value->be16,
2125                                    mask ? mask->be16 : OVS_BE16_MAX, s);
2126         break;
2127
2128     default:
2129         OVS_NOT_REACHED();
2130     }
2131 }
2132 \f
2133 /* Makes subfield 'sf' within 'flow' exactly match the 'sf->n_bits'
2134  * least-significant bits in 'x'.
2135  */
2136 void
2137 mf_write_subfield_flow(const struct mf_subfield *sf,
2138                        const union mf_subvalue *x, struct flow *flow)
2139 {
2140     const struct mf_field *field = sf->field;
2141     union mf_value value;
2142
2143     mf_get_value(field, flow, &value);
2144     bitwise_copy(x, sizeof *x, 0, &value, field->n_bytes,
2145                  sf->ofs, sf->n_bits);
2146     mf_set_flow_value(field, &value, flow);
2147 }
2148
2149 /* Makes subfield 'sf' within 'match' exactly match the 'sf->n_bits'
2150  * least-significant bits in 'x'.
2151  */
2152 void
2153 mf_write_subfield(const struct mf_subfield *sf, const union mf_subvalue *x,
2154                   struct match *match)
2155 {
2156     const struct mf_field *field = sf->field;
2157     union mf_value value, mask;
2158
2159     mf_get(field, match, &value, &mask);
2160     bitwise_copy(x, sizeof *x, 0, &value, field->n_bytes, sf->ofs, sf->n_bits);
2161     bitwise_one (                 &mask,  field->n_bytes, sf->ofs, sf->n_bits);
2162     mf_set(field, &value, &mask, match);
2163 }
2164
2165 /* Initializes 'x' to the value of 'sf' within 'flow'.  'sf' must be valid for
2166  * reading 'flow', e.g. as checked by mf_check_src(). */
2167 void
2168 mf_read_subfield(const struct mf_subfield *sf, const struct flow *flow,
2169                  union mf_subvalue *x)
2170 {
2171     union mf_value value;
2172
2173     mf_get_value(sf->field, flow, &value);
2174
2175     memset(x, 0, sizeof *x);
2176     bitwise_copy(&value, sf->field->n_bytes, sf->ofs,
2177                  x, sizeof *x, 0,
2178                  sf->n_bits);
2179 }
2180
2181 /* Returns the value of 'sf' within 'flow'.  'sf' must be valid for reading
2182  * 'flow', e.g. as checked by mf_check_src() and sf->n_bits must be 64 or
2183  * less. */
2184 uint64_t
2185 mf_get_subfield(const struct mf_subfield *sf, const struct flow *flow)
2186 {
2187     union mf_value value;
2188
2189     mf_get_value(sf->field, flow, &value);
2190     return bitwise_get(&value, sf->field->n_bytes, sf->ofs, sf->n_bits);
2191 }
2192
2193 void
2194 mf_format_subvalue(const union mf_subvalue *subvalue, struct ds *s)
2195 {
2196     int i;
2197
2198     for (i = 0; i < ARRAY_SIZE(subvalue->u8); i++) {
2199         if (subvalue->u8[i]) {
2200             ds_put_format(s, "0x%"PRIx8, subvalue->u8[i]);
2201             for (i++; i < ARRAY_SIZE(subvalue->u8); i++) {
2202                 ds_put_format(s, "%02"PRIx8, subvalue->u8[i]);
2203             }
2204             return;
2205         }
2206     }
2207     ds_put_char(s, '0');
2208 }