lib/match.c

   1 /*
   2  * Copyright (c) 2009, 2010, 2011, 2012, 2013 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 #include "match.h"
  19 #include <stdlib.h>
  20 #include "byte-order.h"
  21 #include "dynamic-string.h"
  22 #include "ofp-util.h"
  23 #include "packets.h"
  24 #include "vlog.h"
  25
  26 VLOG_DEFINE_THIS_MODULE(match);
  27
  28
  29 /* Converts the flow in 'flow' into a match in 'match', with the given
  30  * 'wildcards'. */
  31 void
  32 match_init(struct match *match,
  33            const struct flow *flow, const struct flow_wildcards *wc)
  34 {
  35     match->flow = *flow;
  36     match->wc = *wc;
  37     match_zero_wildcarded_fields(match);
  38 }
  39
  40 /* Converts a flow into a match.  It sets the wildcard masks based on
  41  * the packet contents.  It will not set the mask for fields that do not
  42  * make sense for the packet type. */
  43 void
  44 match_wc_init(struct match *match, const struct flow *flow)
  45 {
  46     struct flow_wildcards *wc;
  47     int i;
  48
  49     match->flow = *flow;
  50     wc = &match->wc;
  51     memset(&wc->masks, 0x0, sizeof wc->masks);
  52
  53     memset(&wc->masks.dl_type, 0xff, sizeof wc->masks.dl_type);
  54
  55     if (flow->nw_proto) {
  56         memset(&wc->masks.nw_proto, 0xff, sizeof wc->masks.nw_proto);
  57     }
  58
  59     if (flow->skb_priority) {
  60         memset(&wc->masks.skb_priority, 0xff, sizeof wc->masks.skb_priority);
  61     }
  62
  63     if (flow->pkt_mark) {
  64         memset(&wc->masks.pkt_mark, 0xff, sizeof wc->masks.pkt_mark);
  65     }
  66
  67     for (i = 0; i < FLOW_N_REGS; i++) {
  68         if (flow->regs[i]) {
  69             memset(&wc->masks.regs[i], 0xff, sizeof wc->masks.regs[i]);
  70         }
  71     }
  72
  73     if (flow->tunnel.ip_dst) {
  74         if (flow->tunnel.flags & FLOW_TNL_F_KEY) {
  75             memset(&wc->masks.tunnel.tun_id, 0xff, sizeof wc->masks.tunnel.tun_id);
  76         }
  77         memset(&wc->masks.tunnel.ip_src, 0xff, sizeof wc->masks.tunnel.ip_src);
  78         memset(&wc->masks.tunnel.ip_dst, 0xff, sizeof wc->masks.tunnel.ip_dst);
  79         memset(&wc->masks.tunnel.flags, 0xff, sizeof wc->masks.tunnel.flags);
  80         memset(&wc->masks.tunnel.ip_tos, 0xff, sizeof wc->masks.tunnel.ip_tos);
  81         memset(&wc->masks.tunnel.ip_ttl, 0xff, sizeof wc->masks.tunnel.ip_ttl);
  82     } else if (flow->tunnel.tun_id) {
  83         memset(&wc->masks.tunnel.tun_id, 0xff, sizeof wc->masks.tunnel.tun_id);
  84     }
  85
  86     memset(&wc->masks.metadata, 0xff, sizeof wc->masks.metadata);
  87     memset(&wc->masks.in_port, 0xff, sizeof wc->masks.in_port);
  88     memset(&wc->masks.vlan_tci, 0xff, sizeof wc->masks.vlan_tci);
  89     memset(&wc->masks.dl_src, 0xff, sizeof wc->masks.dl_src);
  90     memset(&wc->masks.dl_dst, 0xff, sizeof wc->masks.dl_dst);
  91
  92     if (flow->dl_type == htons(ETH_TYPE_IPV6)) {
  93         memset(&wc->masks.ipv6_src, 0xff, sizeof wc->masks.ipv6_src);
  94         memset(&wc->masks.ipv6_dst, 0xff, sizeof wc->masks.ipv6_dst);
  95         memset(&wc->masks.ipv6_label, 0xff, sizeof wc->masks.ipv6_label);
  96     } else if (flow->dl_type == htons(ETH_TYPE_IP) ||
  97                (flow->dl_type == htons(ETH_TYPE_ARP)) ||
  98                (flow->dl_type == htons(ETH_TYPE_RARP))) {
  99         memset(&wc->masks.nw_src, 0xff, sizeof wc->masks.nw_src);
 100         memset(&wc->masks.nw_dst, 0xff, sizeof wc->masks.nw_dst);
 101     } else if (eth_type_mpls(flow->dl_type)) {
 102         memset(&wc->masks.mpls_lse, 0xff, sizeof wc->masks.mpls_lse);
 103     }
 104
 105     if (flow->dl_type == htons(ETH_TYPE_ARP) ||
 106         flow->dl_type == htons(ETH_TYPE_RARP)) {
 107         memset(&wc->masks.arp_sha, 0xff, sizeof wc->masks.arp_sha);
 108         memset(&wc->masks.arp_tha, 0xff, sizeof wc->masks.arp_tha);
 109     }
 110
 111     if (is_ip_any(flow)) {
 112         memset(&wc->masks.nw_tos, 0xff, sizeof wc->masks.nw_tos);
 113         memset(&wc->masks.nw_ttl, 0xff, sizeof wc->masks.nw_ttl);
 114
 115         if (flow->nw_frag) {
 116             memset(&wc->masks.nw_frag, 0xff, sizeof wc->masks.nw_frag);
 117         }
 118
 119         if (flow->nw_proto == IPPROTO_ICMP ||
 120             flow->nw_proto == IPPROTO_ICMPV6 ||
 121             (flow->tp_src || flow->tp_dst)) {
 122             memset(&wc->masks.tp_src, 0xff, sizeof wc->masks.tp_src);
 123             memset(&wc->masks.tp_dst, 0xff, sizeof wc->masks.tp_dst);
 124         }
 125
 126         if (flow->nw_proto == IPPROTO_ICMPV6) {
 127             memset(&wc->masks.arp_sha, 0xff, sizeof wc->masks.arp_sha);
 128             memset(&wc->masks.arp_tha, 0xff, sizeof wc->masks.arp_tha);
 129         }
 130     }
 131
 132     return;
 133 }
 134
 135 /* Converts the flow in 'flow' into an exact-match match in 'match'. */
 136 void
 137 match_init_exact(struct match *match, const struct flow *flow)
 138 {
 139     match->flow = *flow;
 140     match->flow.skb_priority = 0;
 141     flow_wildcards_init_exact(&match->wc);
 142 }
 143
 144 /* Initializes 'match' as a "catch-all" match that matches every packet. */
 145 void
 146 match_init_catchall(struct match *match)
 147 {
 148     memset(&match->flow, 0, sizeof match->flow);
 149     flow_wildcards_init_catchall(&match->wc);
 150 }
 151
 152 /* For each bit or field wildcarded in 'match', sets the corresponding bit or
 153  * field in 'flow' to all-0-bits.  It is important to maintain this invariant
 154  * in a match that might be inserted into a classifier.
 155  *
 156  * It is never necessary to call this function directly for a match that is
 157  * initialized or modified only by match_*() functions.  It is useful to
 158  * restore the invariant in a match whose 'wc' member is modified by hand.
 159  */
 160 void
 161 match_zero_wildcarded_fields(struct match *match)
 162 {
 163     flow_zero_wildcards(&match->flow, &match->wc);
 164 }
 165
 166 void
 167 match_set_reg(struct match *match, unsigned int reg_idx, uint32_t value)
 168 {
 169     match_set_reg_masked(match, reg_idx, value, UINT32_MAX);
 170 }
 171
 172 void
 173 match_set_reg_masked(struct match *match, unsigned int reg_idx,
 174                      uint32_t value, uint32_t mask)
 175 {
 176     ovs_assert(reg_idx < FLOW_N_REGS);
 177     flow_wildcards_set_reg_mask(&match->wc, reg_idx, mask);
 178     match->flow.regs[reg_idx] = value & mask;
 179 }
 180
 181 void
 182 match_set_metadata(struct match *match, ovs_be64 metadata)
 183 {
 184     match_set_metadata_masked(match, metadata, htonll(UINT64_MAX));
 185 }
 186
 187 void
 188 match_set_metadata_masked(struct match *match,
 189                           ovs_be64 metadata, ovs_be64 mask)
 190 {
 191     match->wc.masks.metadata = mask;
 192     match->flow.metadata = metadata & mask;
 193 }
 194
 195 void
 196 match_set_tun_id(struct match *match, ovs_be64 tun_id)
 197 {
 198     match_set_tun_id_masked(match, tun_id, htonll(UINT64_MAX));
 199 }
 200
 201 void
 202 match_set_tun_id_masked(struct match *match, ovs_be64 tun_id, ovs_be64 mask)
 203 {
 204     match->wc.masks.tunnel.tun_id = mask;
 205     match->flow.tunnel.tun_id = tun_id & mask;
 206 }
 207
 208 void
 209 match_set_tun_src(struct match *match, ovs_be32 src)
 210 {
 211     match_set_tun_src_masked(match, src, htonl(UINT32_MAX));
 212 }
 213
 214 void
 215 match_set_tun_src_masked(struct match *match, ovs_be32 src, ovs_be32 mask)
 216 {
 217     match->wc.masks.tunnel.ip_src = mask;
 218     match->flow.tunnel.ip_src = src & mask;
 219 }
 220
 221 void
 222 match_set_tun_dst(struct match *match, ovs_be32 dst)
 223 {
 224     match_set_tun_dst_masked(match, dst, htonl(UINT32_MAX));
 225 }
 226
 227 void
 228 match_set_tun_dst_masked(struct match *match, ovs_be32 dst, ovs_be32 mask)
 229 {
 230     match->wc.masks.tunnel.ip_dst = mask;
 231     match->flow.tunnel.ip_dst = dst & mask;
 232 }
 233
 234 void
 235 match_set_tun_ttl(struct match *match, uint8_t ttl)
 236 {
 237     match_set_tun_ttl_masked(match, ttl, UINT8_MAX);
 238 }
 239
 240 void
 241 match_set_tun_ttl_masked(struct match *match, uint8_t ttl, uint8_t mask)
 242 {
 243     match->wc.masks.tunnel.ip_ttl = mask;
 244     match->flow.tunnel.ip_ttl = ttl & mask;
 245 }
 246
 247 void
 248 match_set_tun_tos(struct match *match, uint8_t tos)
 249 {
 250     match_set_tun_tos_masked(match, tos, UINT8_MAX);
 251 }
 252
 253 void
 254 match_set_tun_tos_masked(struct match *match, uint8_t tos, uint8_t mask)
 255 {
 256     match->wc.masks.tunnel.ip_tos = mask;
 257     match->flow.tunnel.ip_tos = tos & mask;
 258 }
 259
 260 void
 261 match_set_tun_flags(struct match *match, uint16_t flags)
 262 {
 263     match_set_tun_flags_masked(match, flags, UINT16_MAX);
 264 }
 265
 266 void
 267 match_set_tun_flags_masked(struct match *match, uint16_t flags, uint16_t mask)
 268 {
 269     match->wc.masks.tunnel.flags = mask;
 270     match->flow.tunnel.flags = flags & mask;
 271 }
 272
 273 void
 274 match_set_in_port(struct match *match, ofp_port_t ofp_port)
 275 {
 276     match->wc.masks.in_port.ofp_port = u16_to_ofp(UINT16_MAX);
 277     match->flow.in_port.ofp_port = ofp_port;
 278 }
 279
 280 void
 281 match_set_skb_priority(struct match *match, uint32_t skb_priority)
 282 {
 283     match->wc.masks.skb_priority = UINT32_MAX;
 284     match->flow.skb_priority = skb_priority;
 285 }
 286
 287 void
 288 match_set_pkt_mark(struct match *match, uint32_t pkt_mark)
 289 {
 290     match_set_pkt_mark_masked(match, pkt_mark, UINT32_MAX);
 291 }
 292
 293 void
 294 match_set_pkt_mark_masked(struct match *match, uint32_t pkt_mark, uint32_t mask)
 295 {
 296     match->flow.pkt_mark = pkt_mark & mask;
 297     match->wc.masks.pkt_mark = mask;
 298 }
 299
 300 void
 301 match_set_dl_type(struct match *match, ovs_be16 dl_type)
 302 {
 303     match->wc.masks.dl_type = htons(UINT16_MAX);
 304     match->flow.dl_type = dl_type;
 305 }
 306
 307 /* Modifies 'value_src' so that the Ethernet address must match 'value_dst'
 308  * exactly.  'mask_dst' is set to all 1s. */
 309 static void
 310 set_eth(const uint8_t value_src[ETH_ADDR_LEN],
 311         uint8_t value_dst[ETH_ADDR_LEN],
 312         uint8_t mask_dst[ETH_ADDR_LEN])
 313 {
 314     memcpy(value_dst, value_src, ETH_ADDR_LEN);
 315     memset(mask_dst, 0xff, ETH_ADDR_LEN);
 316 }
 317
 318 /* Modifies 'value_src' so that the Ethernet address must match 'value_src'
 319  * after each byte is ANDed with the appropriate byte in 'mask_src'.
 320  * 'mask_dst' is set to 'mask_src' */
 321 static void
 322 set_eth_masked(const uint8_t value_src[ETH_ADDR_LEN],
 323                const uint8_t mask_src[ETH_ADDR_LEN],
 324                uint8_t value_dst[ETH_ADDR_LEN],
 325                uint8_t mask_dst[ETH_ADDR_LEN])
 326 {
 327     size_t i;
 328
 329     for (i = 0; i < ETH_ADDR_LEN; i++) {
 330         value_dst[i] = value_src[i] & mask_src[i];
 331         mask_dst[i] = mask_src[i];
 332     }
 333 }
 334
 335 /* Modifies 'rule' so that the source Ethernet address must match 'dl_src'
 336  * exactly. */
 337 void
 338 match_set_dl_src(struct match *match, const uint8_t dl_src[ETH_ADDR_LEN])
 339 {
 340     set_eth(dl_src, match->flow.dl_src, match->wc.masks.dl_src);
 341 }
 342
 343 /* Modifies 'rule' so that the source Ethernet address must match 'dl_src'
 344  * after each byte is ANDed with the appropriate byte in 'mask'. */
 345 void
 346 match_set_dl_src_masked(struct match *match,
 347                         const uint8_t dl_src[ETH_ADDR_LEN],
 348                         const uint8_t mask[ETH_ADDR_LEN])
 349 {
 350     set_eth_masked(dl_src, mask, match->flow.dl_src, match->wc.masks.dl_src);
 351 }
 352
 353 /* Modifies 'match' so that the Ethernet address must match 'dl_dst'
 354  * exactly. */
 355 void
 356 match_set_dl_dst(struct match *match, const uint8_t dl_dst[ETH_ADDR_LEN])
 357 {
 358     set_eth(dl_dst, match->flow.dl_dst, match->wc.masks.dl_dst);
 359 }
 360
 361 /* Modifies 'match' so that the Ethernet address must match 'dl_dst' after each
 362  * byte is ANDed with the appropriate byte in 'mask'.
 363  *
 364  * This function will assert-fail if 'mask' is invalid.  Only 'mask' values
 365  * accepted by flow_wildcards_is_dl_dst_mask_valid() are allowed. */
 366 void
 367 match_set_dl_dst_masked(struct match *match,
 368                         const uint8_t dl_dst[ETH_ADDR_LEN],
 369                         const uint8_t mask[ETH_ADDR_LEN])
 370 {
 371     set_eth_masked(dl_dst, mask, match->flow.dl_dst, match->wc.masks.dl_dst);
 372 }
 373
 374 void
 375 match_set_dl_tci(struct match *match, ovs_be16 tci)
 376 {
 377     match_set_dl_tci_masked(match, tci, htons(0xffff));
 378 }
 379
 380 void
 381 match_set_dl_tci_masked(struct match *match, ovs_be16 tci, ovs_be16 mask)
 382 {
 383     match->flow.vlan_tci = tci & mask;
 384     match->wc.masks.vlan_tci = mask;
 385 }
 386
 387 /* Modifies 'match' so that the VLAN VID is wildcarded.  If the PCP is already
 388  * wildcarded, then 'match' will match a packet regardless of whether it has an
 389  * 802.1Q header or not. */
 390 void
 391 match_set_any_vid(struct match *match)
 392 {
 393     if (match->wc.masks.vlan_tci & htons(VLAN_PCP_MASK)) {
 394         match->wc.masks.vlan_tci &= ~htons(VLAN_VID_MASK);
 395         match->flow.vlan_tci &= ~htons(VLAN_VID_MASK);
 396     } else {
 397         match_set_dl_tci_masked(match, htons(0), htons(0));
 398     }
 399 }
 400
 401 /* Modifies 'match' depending on 'dl_vlan':
 402  *
 403  *   - If 'dl_vlan' is htons(OFP_VLAN_NONE), makes 'match' match only packets
 404  *     without an 802.1Q header.
 405  *
 406  *   - Otherwise, makes 'match' match only packets with an 802.1Q header whose
 407  *     VID equals the low 12 bits of 'dl_vlan'.
 408  */
 409 void
 410 match_set_dl_vlan(struct match *match, ovs_be16 dl_vlan)
 411 {
 412     flow_set_dl_vlan(&match->flow, dl_vlan);
 413     if (dl_vlan == htons(OFP10_VLAN_NONE)) {
 414         match->wc.masks.vlan_tci = htons(UINT16_MAX);
 415     } else {
 416         match->wc.masks.vlan_tci |= htons(VLAN_VID_MASK | VLAN_CFI);
 417     }
 418 }
 419
 420 /* Sets the VLAN VID that 'match' matches to 'vid', which is interpreted as an
 421  * OpenFlow 1.2 "vlan_vid" value, that is, the low 13 bits of 'vlan_tci' (VID
 422  * plus CFI). */
 423 void
 424 match_set_vlan_vid(struct match *match, ovs_be16 vid)
 425 {
 426     match_set_vlan_vid_masked(match, vid, htons(VLAN_VID_MASK | VLAN_CFI));
 427 }
 428
 429
 430 /* Sets the VLAN VID that 'flow' matches to 'vid', which is interpreted as an
 431  * OpenFlow 1.2 "vlan_vid" value, that is, the low 13 bits of 'vlan_tci' (VID
 432  * plus CFI), with the corresponding 'mask'. */
 433 void
 434 match_set_vlan_vid_masked(struct match *match, ovs_be16 vid, ovs_be16 mask)
 435 {
 436     ovs_be16 pcp_mask = htons(VLAN_PCP_MASK);
 437     ovs_be16 vid_mask = htons(VLAN_VID_MASK | VLAN_CFI);
 438
 439     mask &= vid_mask;
 440     flow_set_vlan_vid(&match->flow, vid & mask);
 441     match->wc.masks.vlan_tci = mask | (match->wc.masks.vlan_tci & pcp_mask);
 442 }
 443
 444 /* Modifies 'match' so that the VLAN PCP is wildcarded.  If the VID is already
 445  * wildcarded, then 'match' will match a packet regardless of whether it has an
 446  * 802.1Q header or not. */
 447 void
 448 match_set_any_pcp(struct match *match)
 449 {
 450     if (match->wc.masks.vlan_tci & htons(VLAN_VID_MASK)) {
 451         match->wc.masks.vlan_tci &= ~htons(VLAN_PCP_MASK);
 452         match->flow.vlan_tci &= ~htons(VLAN_PCP_MASK);
 453     } else {
 454         match_set_dl_tci_masked(match, htons(0), htons(0));
 455     }
 456 }
 457
 458 /* Modifies 'match' so that it matches only packets with an 802.1Q header whose
 459  * PCP equals the low 3 bits of 'dl_vlan_pcp'. */
 460 void
 461 match_set_dl_vlan_pcp(struct match *match, uint8_t dl_vlan_pcp)
 462 {
 463     flow_set_vlan_pcp(&match->flow, dl_vlan_pcp);
 464     match->wc.masks.vlan_tci |= htons(VLAN_CFI | VLAN_PCP_MASK);
 465 }
 466
 467 /* Modifies 'match' so that the MPLS label is wildcarded. */
 468 void
 469 match_set_any_mpls_label(struct match *match)
 470 {
 471     match->wc.masks.mpls_lse &= ~htonl(MPLS_LABEL_MASK);
 472     flow_set_mpls_label(&match->flow, htonl(0));
 473 }
 474
 475 /* Modifies 'match' so that it matches only packets with an MPLS header whose
 476  * label equals the low 20 bits of 'mpls_label'. */
 477 void
 478 match_set_mpls_label(struct match *match, ovs_be32 mpls_label)
 479 {
 480     match->wc.masks.mpls_lse |= htonl(MPLS_LABEL_MASK);
 481     flow_set_mpls_label(&match->flow, mpls_label);
 482 }
 483
 484 /* Modifies 'match' so that the MPLS TC is wildcarded. */
 485 void
 486 match_set_any_mpls_tc(struct match *match)
 487 {
 488     match->wc.masks.mpls_lse &= ~htonl(MPLS_TC_MASK);
 489     flow_set_mpls_tc(&match->flow, 0);
 490 }
 491
 492 /* Modifies 'match' so that it matches only packets with an MPLS header whose
 493  * Traffic Class equals the low 3 bits of 'mpls_tc'. */
 494 void
 495 match_set_mpls_tc(struct match *match, uint8_t mpls_tc)
 496 {
 497     match->wc.masks.mpls_lse |= htonl(MPLS_TC_MASK);
 498     flow_set_mpls_tc(&match->flow, mpls_tc);
 499 }
 500
 501 /* Modifies 'match' so that the MPLS stack flag is wildcarded. */
 502 void
 503 match_set_any_mpls_bos(struct match *match)
 504 {
 505     match->wc.masks.mpls_lse &= ~htonl(MPLS_BOS_MASK);
 506     flow_set_mpls_bos(&match->flow, 0);
 507 }
 508
 509 /* Modifies 'match' so that it matches only packets with an MPLS header whose
 510  * Stack Flag equals the lower bit of 'mpls_bos' */
 511 void
 512 match_set_mpls_bos(struct match *match, uint8_t mpls_bos)
 513 {
 514     match->wc.masks.mpls_lse |= htonl(MPLS_BOS_MASK);
 515     flow_set_mpls_bos(&match->flow, mpls_bos);
 516 }
 517
 518 void
 519 match_set_tp_src(struct match *match, ovs_be16 tp_src)
 520 {
 521     match_set_tp_src_masked(match, tp_src, htons(UINT16_MAX));
 522 }
 523
 524 void
 525 match_set_tp_src_masked(struct match *match, ovs_be16 port, ovs_be16 mask)
 526 {
 527     match->flow.tp_src = port & mask;
 528     match->wc.masks.tp_src = mask;
 529 }
 530
 531 void
 532 match_set_tp_dst(struct match *match, ovs_be16 tp_dst)
 533 {
 534     match_set_tp_dst_masked(match, tp_dst, htons(UINT16_MAX));
 535 }
 536
 537 void
 538 match_set_tp_dst_masked(struct match *match, ovs_be16 port, ovs_be16 mask)
 539 {
 540     match->flow.tp_dst = port & mask;
 541     match->wc.masks.tp_dst = mask;
 542 }
 543
 544 void
 545 match_set_nw_proto(struct match *match, uint8_t nw_proto)
 546 {
 547     match->flow.nw_proto = nw_proto;
 548     match->wc.masks.nw_proto = UINT8_MAX;
 549 }
 550
 551 void
 552 match_set_nw_src(struct match *match, ovs_be32 nw_src)
 553 {
 554     match->flow.nw_src = nw_src;
 555     match->wc.masks.nw_src = htonl(UINT32_MAX);
 556 }
 557
 558 void
 559 match_set_nw_src_masked(struct match *match,
 560                         ovs_be32 nw_src, ovs_be32 mask)
 561 {
 562     match->flow.nw_src = nw_src & mask;
 563     match->wc.masks.nw_src = mask;
 564 }
 565
 566 void
 567 match_set_nw_dst(struct match *match, ovs_be32 nw_dst)
 568 {
 569     match->flow.nw_dst = nw_dst;
 570     match->wc.masks.nw_dst = htonl(UINT32_MAX);
 571 }
 572
 573 void
 574 match_set_nw_dst_masked(struct match *match, ovs_be32 ip, ovs_be32 mask)
 575 {
 576     match->flow.nw_dst = ip & mask;
 577     match->wc.masks.nw_dst = mask;
 578 }
 579
 580 void
 581 match_set_nw_dscp(struct match *match, uint8_t nw_dscp)
 582 {
 583     match->wc.masks.nw_tos |= IP_DSCP_MASK;
 584     match->flow.nw_tos &= ~IP_DSCP_MASK;
 585     match->flow.nw_tos |= nw_dscp & IP_DSCP_MASK;
 586 }
 587
 588 void
 589 match_set_nw_ecn(struct match *match, uint8_t nw_ecn)
 590 {
 591     match->wc.masks.nw_tos |= IP_ECN_MASK;
 592     match->flow.nw_tos &= ~IP_ECN_MASK;
 593     match->flow.nw_tos |= nw_ecn & IP_ECN_MASK;
 594 }
 595
 596 void
 597 match_set_nw_ttl(struct match *match, uint8_t nw_ttl)
 598 {
 599     match->wc.masks.nw_ttl = UINT8_MAX;
 600     match->flow.nw_ttl = nw_ttl;
 601 }
 602
 603 void
 604 match_set_nw_frag(struct match *match, uint8_t nw_frag)
 605 {
 606     match->wc.masks.nw_frag |= FLOW_NW_FRAG_MASK;
 607     match->flow.nw_frag = nw_frag;
 608 }
 609
 610 void
 611 match_set_nw_frag_masked(struct match *match,
 612                          uint8_t nw_frag, uint8_t mask)
 613 {
 614     match->flow.nw_frag = nw_frag & mask;
 615     match->wc.masks.nw_frag = mask;
 616 }
 617
 618 void
 619 match_set_icmp_type(struct match *match, uint8_t icmp_type)
 620 {
 621     match_set_tp_src(match, htons(icmp_type));
 622 }
 623
 624 void
 625 match_set_icmp_code(struct match *match, uint8_t icmp_code)
 626 {
 627     match_set_tp_dst(match, htons(icmp_code));
 628 }
 629
 630 void
 631 match_set_arp_sha(struct match *match, const uint8_t sha[ETH_ADDR_LEN])
 632 {
 633     memcpy(match->flow.arp_sha, sha, ETH_ADDR_LEN);
 634     memset(match->wc.masks.arp_sha, UINT8_MAX, ETH_ADDR_LEN);
 635 }
 636
 637 void
 638 match_set_arp_sha_masked(struct match *match,
 639                          const uint8_t arp_sha[ETH_ADDR_LEN],
 640                          const uint8_t mask[ETH_ADDR_LEN])
 641 {
 642     set_eth_masked(arp_sha, mask,
 643                    match->flow.arp_sha, match->wc.masks.arp_sha);
 644 }
 645
 646 void
 647 match_set_arp_tha(struct match *match, const uint8_t tha[ETH_ADDR_LEN])
 648 {
 649     memcpy(match->flow.arp_tha, tha, ETH_ADDR_LEN);
 650     memset(match->wc.masks.arp_tha, UINT8_MAX, ETH_ADDR_LEN);
 651 }
 652
 653 void
 654 match_set_arp_tha_masked(struct match *match,
 655                          const uint8_t arp_tha[ETH_ADDR_LEN],
 656                          const uint8_t mask[ETH_ADDR_LEN])
 657 {
 658     set_eth_masked(arp_tha, mask,
 659                    match->flow.arp_tha, match->wc.masks.arp_tha);
 660 }
 661
 662 void
 663 match_set_ipv6_src(struct match *match, const struct in6_addr *src)
 664 {
 665     match->flow.ipv6_src = *src;
 666     match->wc.masks.ipv6_src = in6addr_exact;
 667 }
 668
 669 void
 670 match_set_ipv6_src_masked(struct match *match, const struct in6_addr *src,
 671                           const struct in6_addr *mask)
 672 {
 673     match->flow.ipv6_src = ipv6_addr_bitand(src, mask);
 674     match->wc.masks.ipv6_src = *mask;
 675 }
 676
 677 void
 678 match_set_ipv6_dst(struct match *match, const struct in6_addr *dst)
 679 {
 680     match->flow.ipv6_dst = *dst;
 681     match->wc.masks.ipv6_dst = in6addr_exact;
 682 }
 683
 684 void
 685 match_set_ipv6_dst_masked(struct match *match, const struct in6_addr *dst,
 686                           const struct in6_addr *mask)
 687 {
 688     match->flow.ipv6_dst = ipv6_addr_bitand(dst, mask);
 689     match->wc.masks.ipv6_dst = *mask;
 690 }
 691
 692 void
 693 match_set_ipv6_label(struct match *match, ovs_be32 ipv6_label)
 694 {
 695     match->wc.masks.ipv6_label = htonl(UINT32_MAX);
 696     match->flow.ipv6_label = ipv6_label;
 697 }
 698
 699
 700 void
 701 match_set_ipv6_label_masked(struct match *match, ovs_be32 ipv6_label,
 702                             ovs_be32 mask)
 703 {
 704     match->flow.ipv6_label = ipv6_label & mask;
 705     match->wc.masks.ipv6_label = mask;
 706 }
 707
 708 void
 709 match_set_nd_target(struct match *match, const struct in6_addr *target)
 710 {
 711     match->flow.nd_target = *target;
 712     match->wc.masks.nd_target = in6addr_exact;
 713 }
 714
 715 void
 716 match_set_nd_target_masked(struct match *match,
 717                            const struct in6_addr *target,
 718                            const struct in6_addr *mask)
 719 {
 720     match->flow.nd_target = ipv6_addr_bitand(target, mask);
 721     match->wc.masks.nd_target = *mask;
 722 }
 723
 724 /* Returns true if 'a' and 'b' wildcard the same fields and have the same
 725  * values for fixed fields, otherwise false. */
 726 bool
 727 match_equal(const struct match *a, const struct match *b)
 728 {
 729     return (flow_wildcards_equal(&a->wc, &b->wc)
 730             && flow_equal(&a->flow, &b->flow));
 731 }
 732
 733 /* Returns a hash value for the flow and wildcards in 'match', starting from
 734  * 'basis'. */
 735 uint32_t
 736 match_hash(const struct match *match, uint32_t basis)
 737 {
 738     return flow_wildcards_hash(&match->wc, flow_hash(&match->flow, basis));
 739 }
 740
 741 static void
 742 format_eth_masked(struct ds *s, const char *name, const uint8_t eth[6],
 743                   const uint8_t mask[6])
 744 {
 745     if (!eth_addr_is_zero(mask)) {
 746         ds_put_format(s, "%s=", name);
 747         eth_format_masked(eth, mask, s);
 748         ds_put_char(s, ',');
 749     }
 750 }
 751
 752 static void
 753 format_ip_netmask(struct ds *s, const char *name, ovs_be32 ip,
 754                   ovs_be32 netmask)
 755 {
 756     if (netmask) {
 757         ds_put_format(s, "%s=", name);
 758         ip_format_masked(ip, netmask, s);
 759         ds_put_char(s, ',');
 760     }
 761 }
 762
 763 static void
 764 format_ipv6_netmask(struct ds *s, const char *name,
 765                     const struct in6_addr *addr,
 766                     const struct in6_addr *netmask)
 767 {
 768     if (!ipv6_mask_is_any(netmask)) {
 769         ds_put_format(s, "%s=", name);
 770         print_ipv6_masked(s, addr, netmask);
 771         ds_put_char(s, ',');
 772     }
 773 }
 774
 775
 776 static void
 777 format_be16_masked(struct ds *s, const char *name,
 778                    ovs_be16 value, ovs_be16 mask)
 779 {
 780     if (mask != htons(0)) {
 781         ds_put_format(s, "%s=", name);
 782         if (mask == htons(UINT16_MAX)) {
 783             ds_put_format(s, "%"PRIu16, ntohs(value));
 784         } else {
 785             ds_put_format(s, "0x%"PRIx16"/0x%"PRIx16,
 786                           ntohs(value), ntohs(mask));
 787         }
 788         ds_put_char(s, ',');
 789     }
 790 }
 791
 792 static void
 793 format_flow_tunnel(struct ds *s, const struct match *match)
 794 {
 795     const struct flow_wildcards *wc = &match->wc;
 796     const struct flow_tnl *tnl = &match->flow.tunnel;
 797
 798     switch (wc->masks.tunnel.tun_id) {
 799     case 0:
 800         break;
 801     case CONSTANT_HTONLL(UINT64_MAX):
 802         ds_put_format(s, "tun_id=%#"PRIx64",", ntohll(tnl->tun_id));
 803         break;
 804     default:
 805         ds_put_format(s, "tun_id=%#"PRIx64"/%#"PRIx64",",
 806                       ntohll(tnl->tun_id),
 807                       ntohll(wc->masks.tunnel.tun_id));
 808         break;
 809     }
 810     format_ip_netmask(s, "tun_src", tnl->ip_src, wc->masks.tunnel.ip_src);
 811     format_ip_netmask(s, "tun_dst", tnl->ip_dst, wc->masks.tunnel.ip_dst);
 812
 813     if (wc->masks.tunnel.ip_tos) {
 814         ds_put_format(s, "tun_tos=%"PRIx8",", tnl->ip_tos);
 815     }
 816     if (wc->masks.tunnel.ip_ttl) {
 817         ds_put_format(s, "tun_ttl=%"PRIu8",", tnl->ip_ttl);
 818     }
 819     if (wc->masks.tunnel.flags) {
 820         format_flags(s, flow_tun_flag_to_string, tnl->flags, '|');
 821         ds_put_char(s, ',');
 822     }
 823 }
 824
 825 /* Appends a string representation of 'match' to 's'.  If 'priority' is
 826  * different from OFP_DEFAULT_PRIORITY, includes it in 's'. */
 827 void
 828 match_format(const struct match *match, struct ds *s, unsigned int priority)
 829 {
 830     const struct flow_wildcards *wc = &match->wc;
 831     size_t start_len = s->length;
 832     const struct flow *f = &match->flow;
 833     bool skip_type = false;
 834     bool skip_proto = false;
 835
 836     int i;
 837
 838     BUILD_ASSERT_DECL(FLOW_WC_SEQ == 20);
 839
 840     if (priority != OFP_DEFAULT_PRIORITY) {
 841         ds_put_format(s, "priority=%u,", priority);
 842     }
 843
 844     switch (wc->masks.pkt_mark) {
 845     case 0:
 846         break;
 847     case UINT32_MAX:
 848         ds_put_format(s, "pkt_mark=%#"PRIx32",", f->pkt_mark);
 849         break;
 850     default:
 851         ds_put_format(s, "pkt_mark=%#"PRIx32"/%#"PRIx32",",
 852                       f->pkt_mark, wc->masks.pkt_mark);
 853         break;
 854     }
 855
 856     if (wc->masks.skb_priority) {
 857         ds_put_format(s, "skb_priority=%#"PRIx32",", f->skb_priority);
 858     }
 859
 860     if (wc->masks.dl_type) {
 861         skip_type = true;
 862         if (f->dl_type == htons(ETH_TYPE_IP)) {
 863             if (wc->masks.nw_proto) {
 864                 skip_proto = true;
 865                 if (f->nw_proto == IPPROTO_ICMP) {
 866                     ds_put_cstr(s, "icmp,");
 867                 } else if (f->nw_proto == IPPROTO_TCP) {
 868                     ds_put_cstr(s, "tcp,");
 869                 } else if (f->nw_proto == IPPROTO_UDP) {
 870                     ds_put_cstr(s, "udp,");
 871                 } else if (f->nw_proto == IPPROTO_SCTP) {
 872                     ds_put_cstr(s, "sctp,");
 873                 } else {
 874                     ds_put_cstr(s, "ip,");
 875                     skip_proto = false;
 876                 }
 877             } else {
 878                 ds_put_cstr(s, "ip,");
 879             }
 880         } else if (f->dl_type == htons(ETH_TYPE_IPV6)) {
 881             if (wc->masks.nw_proto) {
 882                 skip_proto = true;
 883                 if (f->nw_proto == IPPROTO_ICMPV6) {
 884                     ds_put_cstr(s, "icmp6,");
 885                 } else if (f->nw_proto == IPPROTO_TCP) {
 886                     ds_put_cstr(s, "tcp6,");
 887                 } else if (f->nw_proto == IPPROTO_UDP) {
 888                     ds_put_cstr(s, "udp6,");
 889                 } else if (f->nw_proto == IPPROTO_SCTP) {
 890                     ds_put_cstr(s, "sctp6,");
 891                 } else {
 892                     ds_put_cstr(s, "ipv6,");
 893                     skip_proto = false;
 894                 }
 895             } else {
 896                 ds_put_cstr(s, "ipv6,");
 897             }
 898         } else if (f->dl_type == htons(ETH_TYPE_ARP)) {
 899             ds_put_cstr(s, "arp,");
 900         } else if (f->dl_type == htons(ETH_TYPE_RARP)) {
 901             ds_put_cstr(s, "rarp,");
 902         } else if (f->dl_type == htons(ETH_TYPE_MPLS)) {
 903             ds_put_cstr(s, "mpls,");
 904         } else if (f->dl_type == htons(ETH_TYPE_MPLS_MCAST)) {
 905             ds_put_cstr(s, "mplsm,");
 906         } else {
 907             skip_type = false;
 908         }
 909     }
 910     for (i = 0; i < FLOW_N_REGS; i++) {
 911         switch (wc->masks.regs[i]) {
 912         case 0:
 913             break;
 914         case UINT32_MAX:
 915             ds_put_format(s, "reg%d=0x%"PRIx32",", i, f->regs[i]);
 916             break;
 917         default:
 918             ds_put_format(s, "reg%d=0x%"PRIx32"/0x%"PRIx32",",
 919                           i, f->regs[i], wc->masks.regs[i]);
 920             break;
 921         }
 922     }
 923
 924     format_flow_tunnel(s, match);
 925
 926     switch (wc->masks.metadata) {
 927     case 0:
 928         break;
 929     case CONSTANT_HTONLL(UINT64_MAX):
 930         ds_put_format(s, "metadata=%#"PRIx64",", ntohll(f->metadata));
 931         break;
 932     default:
 933         ds_put_format(s, "metadata=%#"PRIx64"/%#"PRIx64",",
 934                       ntohll(f->metadata), ntohll(wc->masks.metadata));
 935         break;
 936     }
 937     if (wc->masks.in_port.ofp_port) {
 938         ds_put_cstr(s, "in_port=");
 939         ofputil_format_port(f->in_port.ofp_port, s);
 940         ds_put_char(s, ',');
 941     }
 942     if (wc->masks.vlan_tci) {
 943         ovs_be16 vid_mask = wc->masks.vlan_tci & htons(VLAN_VID_MASK);
 944         ovs_be16 pcp_mask = wc->masks.vlan_tci & htons(VLAN_PCP_MASK);
 945         ovs_be16 cfi = wc->masks.vlan_tci & htons(VLAN_CFI);
 946
 947         if (cfi && f->vlan_tci & htons(VLAN_CFI)
 948             && (!vid_mask || vid_mask == htons(VLAN_VID_MASK))
 949             && (!pcp_mask || pcp_mask == htons(VLAN_PCP_MASK))
 950             && (vid_mask || pcp_mask)) {
 951             if (vid_mask) {
 952                 ds_put_format(s, "dl_vlan=%"PRIu16",",
 953                               vlan_tci_to_vid(f->vlan_tci));
 954             }
 955             if (pcp_mask) {
 956                 ds_put_format(s, "dl_vlan_pcp=%d,",
 957                               vlan_tci_to_pcp(f->vlan_tci));
 958             }
 959         } else if (wc->masks.vlan_tci == htons(0xffff)) {
 960             ds_put_format(s, "vlan_tci=0x%04"PRIx16",", ntohs(f->vlan_tci));
 961         } else {
 962             ds_put_format(s, "vlan_tci=0x%04"PRIx16"/0x%04"PRIx16",",
 963                           ntohs(f->vlan_tci), ntohs(wc->masks.vlan_tci));
 964         }
 965     }
 966     format_eth_masked(s, "dl_src", f->dl_src, wc->masks.dl_src);
 967     format_eth_masked(s, "dl_dst", f->dl_dst, wc->masks.dl_dst);
 968     if (!skip_type && wc->masks.dl_type) {
 969         ds_put_format(s, "dl_type=0x%04"PRIx16",", ntohs(f->dl_type));
 970     }
 971     if (f->dl_type == htons(ETH_TYPE_IPV6)) {
 972         format_ipv6_netmask(s, "ipv6_src", &f->ipv6_src, &wc->masks.ipv6_src);
 973         format_ipv6_netmask(s, "ipv6_dst", &f->ipv6_dst, &wc->masks.ipv6_dst);
 974         if (wc->masks.ipv6_label) {
 975             if (wc->masks.ipv6_label == htonl(UINT32_MAX)) {
 976                 ds_put_format(s, "ipv6_label=0x%05"PRIx32",",
 977                               ntohl(f->ipv6_label));
 978             } else {
 979                 ds_put_format(s, "ipv6_label=0x%05"PRIx32"/0x%05"PRIx32",",
 980                               ntohl(f->ipv6_label),
 981                               ntohl(wc->masks.ipv6_label));
 982             }
 983         }
 984     } else if (f->dl_type == htons(ETH_TYPE_ARP) ||
 985                f->dl_type == htons(ETH_TYPE_RARP)) {
 986         format_ip_netmask(s, "arp_spa", f->nw_src, wc->masks.nw_src);
 987         format_ip_netmask(s, "arp_tpa", f->nw_dst, wc->masks.nw_dst);
 988     } else {
 989         format_ip_netmask(s, "nw_src", f->nw_src, wc->masks.nw_src);
 990         format_ip_netmask(s, "nw_dst", f->nw_dst, wc->masks.nw_dst);
 991     }
 992     if (!skip_proto && wc->masks.nw_proto) {
 993         if (f->dl_type == htons(ETH_TYPE_ARP) ||
 994             f->dl_type == htons(ETH_TYPE_RARP)) {
 995             ds_put_format(s, "arp_op=%"PRIu8",", f->nw_proto);
 996         } else {
 997             ds_put_format(s, "nw_proto=%"PRIu8",", f->nw_proto);
 998         }
 999     }
1000     if (f->dl_type == htons(ETH_TYPE_ARP) ||
1001         f->dl_type == htons(ETH_TYPE_RARP)) {
1002         format_eth_masked(s, "arp_sha", f->arp_sha, wc->masks.arp_sha);
1003         format_eth_masked(s, "arp_tha", f->arp_tha, wc->masks.arp_tha);
1004     }
1005     if (wc->masks.nw_tos & IP_DSCP_MASK) {
1006         ds_put_format(s, "nw_tos=%"PRIu8",", f->nw_tos & IP_DSCP_MASK);
1007     }
1008     if (wc->masks.nw_tos & IP_ECN_MASK) {
1009         ds_put_format(s, "nw_ecn=%"PRIu8",", f->nw_tos & IP_ECN_MASK);
1010     }
1011     if (wc->masks.nw_ttl) {
1012         ds_put_format(s, "nw_ttl=%"PRIu8",", f->nw_ttl);
1013     }
1014     if (wc->masks.mpls_lse & htonl(MPLS_LABEL_MASK)) {
1015         ds_put_format(s, "mpls_label=%"PRIu32",",
1016                  mpls_lse_to_label(f->mpls_lse));
1017     }
1018     if (wc->masks.mpls_lse & htonl(MPLS_TC_MASK)) {
1019         ds_put_format(s, "mpls_tc=%"PRIu8",",
1020                  mpls_lse_to_tc(f->mpls_lse));
1021     }
1022     if (wc->masks.mpls_lse & htonl(MPLS_TTL_MASK)) {
1023         ds_put_format(s, "mpls_ttl=%"PRIu8",",
1024                  mpls_lse_to_ttl(f->mpls_lse));
1025     }
1026     if (wc->masks.mpls_lse & htonl(MPLS_BOS_MASK)) {
1027         ds_put_format(s, "mpls_bos=%"PRIu8",",
1028                  mpls_lse_to_bos(f->mpls_lse));
1029     }
1030     switch (wc->masks.nw_frag) {
1031     case FLOW_NW_FRAG_ANY | FLOW_NW_FRAG_LATER:
1032         ds_put_format(s, "nw_frag=%s,",
1033                       f->nw_frag & FLOW_NW_FRAG_ANY
1034                       ? (f->nw_frag & FLOW_NW_FRAG_LATER ? "later" : "first")
1035                       : (f->nw_frag & FLOW_NW_FRAG_LATER ? "<error>" : "no"));
1036         break;
1037
1038     case FLOW_NW_FRAG_ANY:
1039         ds_put_format(s, "nw_frag=%s,",
1040                       f->nw_frag & FLOW_NW_FRAG_ANY ? "yes" : "no");
1041         break;
1042
1043     case FLOW_NW_FRAG_LATER:
1044         ds_put_format(s, "nw_frag=%s,",
1045                       f->nw_frag & FLOW_NW_FRAG_LATER ? "later" : "not_later");
1046         break;
1047     }
1048     if (f->dl_type == htons(ETH_TYPE_IP) &&
1049         f->nw_proto == IPPROTO_ICMP) {
1050         format_be16_masked(s, "icmp_type", f->tp_src, wc->masks.tp_src);
1051         format_be16_masked(s, "icmp_code", f->tp_dst, wc->masks.tp_dst);
1052     } else if (f->dl_type == htons(ETH_TYPE_IPV6) &&
1053                f->nw_proto == IPPROTO_ICMPV6) {
1054         format_be16_masked(s, "icmp_type", f->tp_src, wc->masks.tp_src);
1055         format_be16_masked(s, "icmp_code", f->tp_dst, wc->masks.tp_dst);
1056         format_ipv6_netmask(s, "nd_target", &f->nd_target,
1057                             &wc->masks.nd_target);
1058         format_eth_masked(s, "nd_sll", f->arp_sha, wc->masks.arp_sha);
1059         format_eth_masked(s, "nd_tll", f->arp_tha, wc->masks.arp_tha);
1060     } else {
1061         format_be16_masked(s, "tp_src", f->tp_src, wc->masks.tp_src);
1062         format_be16_masked(s, "tp_dst", f->tp_dst, wc->masks.tp_dst);
1063     }
1064
1065     if (s->length > start_len && ds_last(s) == ',') {
1066         s->length--;
1067     }
1068 }
1069
1070 /* Converts 'match' to a string and returns the string.  If 'priority' is
1071  * different from OFP_DEFAULT_PRIORITY, includes it in the string.  The caller
1072  * must free the string (with free()). */
1073 char *
1074 match_to_string(const struct match *match, unsigned int priority)
1075 {
1076     struct ds s = DS_EMPTY_INITIALIZER;
1077     match_format(match, &s, priority);
1078     return ds_steal_cstr(&s);
1079 }
1080
1081 void
1082 match_print(const struct match *match)
1083 {
1084     char *s = match_to_string(match, OFP_DEFAULT_PRIORITY);
1085     puts(s);
1086     free(s);
1087 }
1088 \f
1089 /* Initializes 'dst' as a copy of 'src'.  The caller must eventually free 'dst'
1090  * with minimatch_destroy(). */
1091 void
1092 minimatch_init(struct minimatch *dst, const struct match *src)
1093 {
1094     miniflow_init(&dst->flow, &src->flow);
1095     minimask_init(&dst->mask, &src->wc);
1096 }
1097
1098 /* Initializes 'dst' as a copy of 'src'.  The caller must eventually free 'dst'
1099  * with minimatch_destroy(). */
1100 void
1101 minimatch_clone(struct minimatch *dst, const struct minimatch *src)
1102 {
1103     miniflow_clone(&dst->flow, &src->flow);
1104     minimask_clone(&dst->mask, &src->mask);
1105 }
1106
1107 /* Frees any memory owned by 'match'.  Does not free the storage in which
1108  * 'match' itself resides; the caller is responsible for that. */
1109 void
1110 minimatch_destroy(struct minimatch *match)
1111 {
1112     miniflow_destroy(&match->flow);
1113     minimask_destroy(&match->mask);
1114 }
1115
1116 /* Initializes 'dst' as a copy of 'src'. */
1117 void
1118 minimatch_expand(const struct minimatch *src, struct match *dst)
1119 {
1120     miniflow_expand(&src->flow, &dst->flow);
1121     minimask_expand(&src->mask, &dst->wc);
1122 }
1123
1124 /* Returns true if 'a' and 'b' match the same packets, false otherwise.  */
1125 bool
1126 minimatch_equal(const struct minimatch *a, const struct minimatch *b)
1127 {
1128     return (miniflow_equal(&a->flow, &b->flow)
1129             && minimask_equal(&a->mask, &b->mask));
1130 }
1131
1132 /* Returns a hash value for 'match', given 'basis'. */
1133 uint32_t
1134 minimatch_hash(const struct minimatch *match, uint32_t basis)
1135 {
1136     return miniflow_hash(&match->flow, minimask_hash(&match->mask, basis));
1137 }
1138
1139 /* Appends a string representation of 'match' to 's'.  If 'priority' is
1140  * different from OFP_DEFAULT_PRIORITY, includes it in 's'. */
1141 void
1142 minimatch_format(const struct minimatch *match, struct ds *s,
1143                  unsigned int priority)
1144 {
1145     struct match megamatch;
1146
1147     minimatch_expand(match, &megamatch);
1148     match_format(&megamatch, s, priority);
1149 }
1150
1151 /* Converts 'match' to a string and returns the string.  If 'priority' is
1152  * different from OFP_DEFAULT_PRIORITY, includes it in the string.  The caller
1153  * must free the string (with free()). */
1154 char *
1155 minimatch_to_string(const struct minimatch *match, unsigned int priority)
1156 {
1157     struct match megamatch;
1158
1159     minimatch_expand(match, &megamatch);
1160     return match_to_string(&megamatch, priority);
1161 }