2 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #include <sys/types.h>
22 #include <netinet/in.h>
23 #include <netinet/icmp6.h>
24 #include <netinet/ip6.h>
28 #include "byte-order.h"
31 #include "dynamic-string.h"
36 #include "openflow/openflow.h"
39 #include "unaligned.h"
41 COVERAGE_DEFINE(flow_extract);
42 COVERAGE_DEFINE(miniflow_malloc);
44 /* U32 indices for segmented flow classification. */
45 const uint8_t flow_segment_u32s[4] = {
46 FLOW_SEGMENT_1_ENDS_AT / 4,
47 FLOW_SEGMENT_2_ENDS_AT / 4,
48 FLOW_SEGMENT_3_ENDS_AT / 4,
52 static struct arp_eth_header *
53 pull_arp(struct ofpbuf *packet)
55 return ofpbuf_try_pull(packet, ARP_ETH_HEADER_LEN);
58 static struct ip_header *
59 pull_ip(struct ofpbuf *packet)
61 if (packet->size >= IP_HEADER_LEN) {
62 struct ip_header *ip = packet->data;
63 int ip_len = IP_IHL(ip->ip_ihl_ver) * 4;
64 if (ip_len >= IP_HEADER_LEN && packet->size >= ip_len) {
65 return ofpbuf_pull(packet, ip_len);
71 static struct tcp_header *
72 pull_tcp(struct ofpbuf *packet)
74 if (packet->size >= TCP_HEADER_LEN) {
75 struct tcp_header *tcp = packet->data;
76 int tcp_len = TCP_OFFSET(tcp->tcp_ctl) * 4;
77 if (tcp_len >= TCP_HEADER_LEN && packet->size >= tcp_len) {
78 return ofpbuf_pull(packet, tcp_len);
84 static struct udp_header *
85 pull_udp(struct ofpbuf *packet)
87 return ofpbuf_try_pull(packet, UDP_HEADER_LEN);
90 static struct sctp_header *
91 pull_sctp(struct ofpbuf *packet)
93 return ofpbuf_try_pull(packet, SCTP_HEADER_LEN);
96 static struct icmp_header *
97 pull_icmp(struct ofpbuf *packet)
99 return ofpbuf_try_pull(packet, ICMP_HEADER_LEN);
102 static struct icmp6_hdr *
103 pull_icmpv6(struct ofpbuf *packet)
105 return ofpbuf_try_pull(packet, sizeof(struct icmp6_hdr));
109 parse_mpls(struct ofpbuf *b, struct flow *flow)
114 while ((mh = ofpbuf_try_pull(b, sizeof *mh))) {
117 flow->mpls_lse = mh->mpls_lse;
119 if (mh->mpls_lse & htonl(MPLS_BOS_MASK)) {
126 parse_vlan(struct ofpbuf *b, struct flow *flow)
129 ovs_be16 eth_type; /* ETH_TYPE_VLAN */
133 if (b->size >= sizeof(struct qtag_prefix) + sizeof(ovs_be16)) {
134 struct qtag_prefix *qp = ofpbuf_pull(b, sizeof *qp);
135 flow->vlan_tci = qp->tci | htons(VLAN_CFI);
140 parse_ethertype(struct ofpbuf *b)
142 struct llc_snap_header *llc;
145 proto = *(ovs_be16 *) ofpbuf_pull(b, sizeof proto);
146 if (ntohs(proto) >= ETH_TYPE_MIN) {
150 if (b->size < sizeof *llc) {
151 return htons(FLOW_DL_TYPE_NONE);
155 if (llc->llc.llc_dsap != LLC_DSAP_SNAP
156 || llc->llc.llc_ssap != LLC_SSAP_SNAP
157 || llc->llc.llc_cntl != LLC_CNTL_SNAP
158 || memcmp(llc->snap.snap_org, SNAP_ORG_ETHERNET,
159 sizeof llc->snap.snap_org)) {
160 return htons(FLOW_DL_TYPE_NONE);
163 ofpbuf_pull(b, sizeof *llc);
165 if (ntohs(llc->snap.snap_type) >= ETH_TYPE_MIN) {
166 return llc->snap.snap_type;
169 return htons(FLOW_DL_TYPE_NONE);
173 parse_ipv6(struct ofpbuf *packet, struct flow *flow)
175 const struct ovs_16aligned_ip6_hdr *nh;
179 nh = ofpbuf_try_pull(packet, sizeof *nh);
184 nexthdr = nh->ip6_nxt;
186 memcpy(&flow->ipv6_src, &nh->ip6_src, sizeof flow->ipv6_src);
187 memcpy(&flow->ipv6_dst, &nh->ip6_dst, sizeof flow->ipv6_dst);
189 tc_flow = get_16aligned_be32(&nh->ip6_flow);
190 flow->nw_tos = ntohl(tc_flow) >> 20;
191 flow->ipv6_label = tc_flow & htonl(IPV6_LABEL_MASK);
192 flow->nw_ttl = nh->ip6_hlim;
193 flow->nw_proto = IPPROTO_NONE;
196 if ((nexthdr != IPPROTO_HOPOPTS)
197 && (nexthdr != IPPROTO_ROUTING)
198 && (nexthdr != IPPROTO_DSTOPTS)
199 && (nexthdr != IPPROTO_AH)
200 && (nexthdr != IPPROTO_FRAGMENT)) {
201 /* It's either a terminal header (e.g., TCP, UDP) or one we
202 * don't understand. In either case, we're done with the
203 * packet, so use it to fill in 'nw_proto'. */
207 /* We only verify that at least 8 bytes of the next header are
208 * available, but many of these headers are longer. Ensure that
209 * accesses within the extension header are within those first 8
210 * bytes. All extension headers are required to be at least 8
212 if (packet->size < 8) {
216 if ((nexthdr == IPPROTO_HOPOPTS)
217 || (nexthdr == IPPROTO_ROUTING)
218 || (nexthdr == IPPROTO_DSTOPTS)) {
219 /* These headers, while different, have the fields we care about
220 * in the same location and with the same interpretation. */
221 const struct ip6_ext *ext_hdr = packet->data;
222 nexthdr = ext_hdr->ip6e_nxt;
223 if (!ofpbuf_try_pull(packet, (ext_hdr->ip6e_len + 1) * 8)) {
226 } else if (nexthdr == IPPROTO_AH) {
227 /* A standard AH definition isn't available, but the fields
228 * we care about are in the same location as the generic
229 * option header--only the header length is calculated
231 const struct ip6_ext *ext_hdr = packet->data;
232 nexthdr = ext_hdr->ip6e_nxt;
233 if (!ofpbuf_try_pull(packet, (ext_hdr->ip6e_len + 2) * 4)) {
236 } else if (nexthdr == IPPROTO_FRAGMENT) {
237 const struct ovs_16aligned_ip6_frag *frag_hdr = packet->data;
239 nexthdr = frag_hdr->ip6f_nxt;
240 if (!ofpbuf_try_pull(packet, sizeof *frag_hdr)) {
244 /* We only process the first fragment. */
245 if (frag_hdr->ip6f_offlg != htons(0)) {
246 flow->nw_frag = FLOW_NW_FRAG_ANY;
247 if ((frag_hdr->ip6f_offlg & IP6F_OFF_MASK) != htons(0)) {
248 flow->nw_frag |= FLOW_NW_FRAG_LATER;
249 nexthdr = IPPROTO_FRAGMENT;
256 flow->nw_proto = nexthdr;
261 parse_tcp(struct ofpbuf *packet, struct ofpbuf *b, struct flow *flow)
263 const struct tcp_header *tcp = pull_tcp(b);
265 flow->tp_src = tcp->tcp_src;
266 flow->tp_dst = tcp->tcp_dst;
267 flow->tcp_flags = tcp->tcp_ctl & htons(0x0fff);
268 packet->l7 = b->data;
273 parse_udp(struct ofpbuf *packet, struct ofpbuf *b, struct flow *flow)
275 const struct udp_header *udp = pull_udp(b);
277 flow->tp_src = udp->udp_src;
278 flow->tp_dst = udp->udp_dst;
279 packet->l7 = b->data;
284 parse_sctp(struct ofpbuf *packet, struct ofpbuf *b, struct flow *flow)
286 const struct sctp_header *sctp = pull_sctp(b);
288 flow->tp_src = sctp->sctp_src;
289 flow->tp_dst = sctp->sctp_dst;
290 packet->l7 = b->data;
295 parse_icmpv6(struct ofpbuf *b, struct flow *flow)
297 const struct icmp6_hdr *icmp = pull_icmpv6(b);
303 /* The ICMPv6 type and code fields use the 16-bit transport port
304 * fields, so we need to store them in 16-bit network byte order. */
305 flow->tp_src = htons(icmp->icmp6_type);
306 flow->tp_dst = htons(icmp->icmp6_code);
308 if (icmp->icmp6_code == 0 &&
309 (icmp->icmp6_type == ND_NEIGHBOR_SOLICIT ||
310 icmp->icmp6_type == ND_NEIGHBOR_ADVERT)) {
311 const struct in6_addr *nd_target;
313 nd_target = ofpbuf_try_pull(b, sizeof *nd_target);
317 flow->nd_target = *nd_target;
319 while (b->size >= 8) {
320 /* The minimum size of an option is 8 bytes, which also is
321 * the size of Ethernet link-layer options. */
322 const struct nd_opt_hdr *nd_opt = b->data;
323 int opt_len = nd_opt->nd_opt_len * 8;
325 if (!opt_len || opt_len > b->size) {
329 /* Store the link layer address if the appropriate option is
330 * provided. It is considered an error if the same link
331 * layer option is specified twice. */
332 if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LINKADDR
334 if (eth_addr_is_zero(flow->arp_sha)) {
335 memcpy(flow->arp_sha, nd_opt + 1, ETH_ADDR_LEN);
339 } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LINKADDR
341 if (eth_addr_is_zero(flow->arp_tha)) {
342 memcpy(flow->arp_tha, nd_opt + 1, ETH_ADDR_LEN);
348 if (!ofpbuf_try_pull(b, opt_len)) {
357 memset(&flow->nd_target, 0, sizeof(flow->nd_target));
358 memset(flow->arp_sha, 0, sizeof(flow->arp_sha));
359 memset(flow->arp_tha, 0, sizeof(flow->arp_tha));
365 /* Initializes 'flow' members from 'packet', 'skb_priority', 'tnl', and
368 * Initializes 'packet' header pointers as follows:
370 * - packet->l2 to the start of the Ethernet header.
372 * - packet->l2_5 to the start of the MPLS shim header.
374 * - packet->l3 to just past the Ethernet header, or just past the
375 * vlan_header if one is present, to the first byte of the payload of the
378 * - packet->l4 to just past the IPv4 header, if one is present and has a
379 * correct length, and otherwise NULL.
381 * - packet->l7 to just past the TCP/UDP/SCTP/ICMP header, if one is
382 * present and has a correct length, and otherwise NULL.
385 flow_extract(struct ofpbuf *packet, uint32_t skb_priority, uint32_t pkt_mark,
386 const struct flow_tnl *tnl, const union flow_in_port *in_port,
389 struct ofpbuf b = *packet;
390 struct eth_header *eth;
392 COVERAGE_INC(flow_extract);
394 memset(flow, 0, sizeof *flow);
397 ovs_assert(tnl != &flow->tunnel);
401 flow->in_port = *in_port;
403 flow->skb_priority = skb_priority;
404 flow->pkt_mark = pkt_mark;
412 if (b.size < sizeof *eth) {
418 memcpy(flow->dl_src, eth->eth_src, ETH_ADDR_LEN);
419 memcpy(flow->dl_dst, eth->eth_dst, ETH_ADDR_LEN);
421 /* dl_type, vlan_tci. */
422 ofpbuf_pull(&b, ETH_ADDR_LEN * 2);
423 if (eth->eth_type == htons(ETH_TYPE_VLAN)) {
424 parse_vlan(&b, flow);
426 flow->dl_type = parse_ethertype(&b);
428 /* Parse mpls, copy l3 ttl. */
429 if (eth_type_mpls(flow->dl_type)) {
430 packet->l2_5 = b.data;
431 parse_mpls(&b, flow);
436 if (flow->dl_type == htons(ETH_TYPE_IP)) {
437 const struct ip_header *nh = pull_ip(&b);
441 flow->nw_src = get_16aligned_be32(&nh->ip_src);
442 flow->nw_dst = get_16aligned_be32(&nh->ip_dst);
443 flow->nw_proto = nh->ip_proto;
445 flow->nw_tos = nh->ip_tos;
446 if (IP_IS_FRAGMENT(nh->ip_frag_off)) {
447 flow->nw_frag = FLOW_NW_FRAG_ANY;
448 if (nh->ip_frag_off & htons(IP_FRAG_OFF_MASK)) {
449 flow->nw_frag |= FLOW_NW_FRAG_LATER;
452 flow->nw_ttl = nh->ip_ttl;
454 if (!(nh->ip_frag_off & htons(IP_FRAG_OFF_MASK))) {
455 if (flow->nw_proto == IPPROTO_TCP) {
456 parse_tcp(packet, &b, flow);
457 } else if (flow->nw_proto == IPPROTO_UDP) {
458 parse_udp(packet, &b, flow);
459 } else if (flow->nw_proto == IPPROTO_SCTP) {
460 parse_sctp(packet, &b, flow);
461 } else if (flow->nw_proto == IPPROTO_ICMP) {
462 const struct icmp_header *icmp = pull_icmp(&b);
464 flow->tp_src = htons(icmp->icmp_type);
465 flow->tp_dst = htons(icmp->icmp_code);
471 } else if (flow->dl_type == htons(ETH_TYPE_IPV6)) {
472 if (parse_ipv6(&b, flow)) {
477 if (flow->nw_proto == IPPROTO_TCP) {
478 parse_tcp(packet, &b, flow);
479 } else if (flow->nw_proto == IPPROTO_UDP) {
480 parse_udp(packet, &b, flow);
481 } else if (flow->nw_proto == IPPROTO_SCTP) {
482 parse_sctp(packet, &b, flow);
483 } else if (flow->nw_proto == IPPROTO_ICMPV6) {
484 if (parse_icmpv6(&b, flow)) {
488 } else if (flow->dl_type == htons(ETH_TYPE_ARP) ||
489 flow->dl_type == htons(ETH_TYPE_RARP)) {
490 const struct arp_eth_header *arp = pull_arp(&b);
491 if (arp && arp->ar_hrd == htons(1)
492 && arp->ar_pro == htons(ETH_TYPE_IP)
493 && arp->ar_hln == ETH_ADDR_LEN
494 && arp->ar_pln == 4) {
495 /* We only match on the lower 8 bits of the opcode. */
496 if (ntohs(arp->ar_op) <= 0xff) {
497 flow->nw_proto = ntohs(arp->ar_op);
500 flow->nw_src = get_16aligned_be32(&arp->ar_spa);
501 flow->nw_dst = get_16aligned_be32(&arp->ar_tpa);
502 memcpy(flow->arp_sha, arp->ar_sha, ETH_ADDR_LEN);
503 memcpy(flow->arp_tha, arp->ar_tha, ETH_ADDR_LEN);
508 /* For every bit of a field that is wildcarded in 'wildcards', sets the
509 * corresponding bit in 'flow' to zero. */
511 flow_zero_wildcards(struct flow *flow, const struct flow_wildcards *wildcards)
513 uint32_t *flow_u32 = (uint32_t *) flow;
514 const uint32_t *wc_u32 = (const uint32_t *) &wildcards->masks;
517 for (i = 0; i < FLOW_U32S; i++) {
518 flow_u32[i] &= wc_u32[i];
522 /* Initializes 'fmd' with the metadata found in 'flow'. */
524 flow_get_metadata(const struct flow *flow, struct flow_metadata *fmd)
526 BUILD_ASSERT_DECL(FLOW_WC_SEQ == 23);
528 fmd->tun_id = flow->tunnel.tun_id;
529 fmd->tun_src = flow->tunnel.ip_src;
530 fmd->tun_dst = flow->tunnel.ip_dst;
531 fmd->metadata = flow->metadata;
532 memcpy(fmd->regs, flow->regs, sizeof fmd->regs);
533 fmd->pkt_mark = flow->pkt_mark;
534 fmd->in_port = flow->in_port.ofp_port;
538 flow_to_string(const struct flow *flow)
540 struct ds ds = DS_EMPTY_INITIALIZER;
541 flow_format(&ds, flow);
546 flow_tun_flag_to_string(uint32_t flags)
549 case FLOW_TNL_F_DONT_FRAGMENT:
551 case FLOW_TNL_F_CSUM:
561 format_flags(struct ds *ds, const char *(*bit_to_string)(uint32_t),
562 uint32_t flags, char del)
570 uint32_t bit = rightmost_1bit(flags);
573 s = bit_to_string(bit);
575 ds_put_format(ds, "%s%c", s, del);
584 ds_put_format(ds, "0x%"PRIx32"%c", bad, del);
590 flow_format(struct ds *ds, const struct flow *flow)
594 match_wc_init(&match, flow);
595 match_format(&match, ds, OFP_DEFAULT_PRIORITY);
599 flow_print(FILE *stream, const struct flow *flow)
601 char *s = flow_to_string(flow);
606 /* flow_wildcards functions. */
608 /* Initializes 'wc' as a set of wildcards that matches every packet. */
610 flow_wildcards_init_catchall(struct flow_wildcards *wc)
612 memset(&wc->masks, 0, sizeof wc->masks);
615 /* Returns true if 'wc' matches every packet, false if 'wc' fixes any bits or
618 flow_wildcards_is_catchall(const struct flow_wildcards *wc)
620 const uint32_t *wc_u32 = (const uint32_t *) &wc->masks;
623 for (i = 0; i < FLOW_U32S; i++) {
631 /* Sets 'dst' as the bitwise AND of wildcards in 'src1' and 'src2'.
632 * That is, a bit or a field is wildcarded in 'dst' if it is wildcarded
633 * in 'src1' or 'src2' or both. */
635 flow_wildcards_and(struct flow_wildcards *dst,
636 const struct flow_wildcards *src1,
637 const struct flow_wildcards *src2)
639 uint32_t *dst_u32 = (uint32_t *) &dst->masks;
640 const uint32_t *src1_u32 = (const uint32_t *) &src1->masks;
641 const uint32_t *src2_u32 = (const uint32_t *) &src2->masks;
644 for (i = 0; i < FLOW_U32S; i++) {
645 dst_u32[i] = src1_u32[i] & src2_u32[i];
649 /* Sets 'dst' as the bitwise OR of wildcards in 'src1' and 'src2'. That
650 * is, a bit or a field is wildcarded in 'dst' if it is neither
651 * wildcarded in 'src1' nor 'src2'. */
653 flow_wildcards_or(struct flow_wildcards *dst,
654 const struct flow_wildcards *src1,
655 const struct flow_wildcards *src2)
657 uint32_t *dst_u32 = (uint32_t *) &dst->masks;
658 const uint32_t *src1_u32 = (const uint32_t *) &src1->masks;
659 const uint32_t *src2_u32 = (const uint32_t *) &src2->masks;
662 for (i = 0; i < FLOW_U32S; i++) {
663 dst_u32[i] = src1_u32[i] | src2_u32[i];
667 /* Perform a bitwise OR of miniflow 'src' flow data with the equivalent
668 * fields in 'dst', storing the result in 'dst'. */
670 flow_union_with_miniflow(struct flow *dst, const struct miniflow *src)
672 uint32_t *dst_u32 = (uint32_t *) dst;
673 const uint32_t *p = src->values;
676 for (map = src->map; map; map = zero_rightmost_1bit(map)) {
677 dst_u32[raw_ctz(map)] |= *p++;
681 /* Fold minimask 'mask''s wildcard mask into 'wc's wildcard mask. */
683 flow_wildcards_fold_minimask(struct flow_wildcards *wc,
684 const struct minimask *mask)
686 flow_union_with_miniflow(&wc->masks, &mask->masks);
690 miniflow_get_map_in_range(const struct miniflow *miniflow,
691 uint8_t start, uint8_t end, const uint32_t **data)
693 uint64_t map = miniflow->map;
694 uint32_t *p = miniflow->values;
697 uint64_t msk = (UINT64_C(1) << start) - 1; /* 'start' LSBs set */
698 p += count_1bits(map & msk); /* Skip to start. */
701 if (end < FLOW_U32S) {
702 uint64_t msk = (UINT64_C(1) << end) - 1; /* 'end' LSBs set */
710 /* Fold minimask 'mask''s wildcard mask into 'wc's wildcard mask
711 * in range [start, end). */
713 flow_wildcards_fold_minimask_range(struct flow_wildcards *wc,
714 const struct minimask *mask,
715 uint8_t start, uint8_t end)
717 uint32_t *dst_u32 = (uint32_t *)&wc->masks;
719 uint64_t map = miniflow_get_map_in_range(&mask->masks, start, end, &p);
721 for (; map; map = zero_rightmost_1bit(map)) {
722 dst_u32[raw_ctz(map)] |= *p++;
726 /* Returns a hash of the wildcards in 'wc'. */
728 flow_wildcards_hash(const struct flow_wildcards *wc, uint32_t basis)
730 return flow_hash(&wc->masks, basis);
733 /* Returns true if 'a' and 'b' represent the same wildcards, false if they are
736 flow_wildcards_equal(const struct flow_wildcards *a,
737 const struct flow_wildcards *b)
739 return flow_equal(&a->masks, &b->masks);
742 /* Returns true if at least one bit or field is wildcarded in 'a' but not in
743 * 'b', false otherwise. */
745 flow_wildcards_has_extra(const struct flow_wildcards *a,
746 const struct flow_wildcards *b)
748 const uint32_t *a_u32 = (const uint32_t *) &a->masks;
749 const uint32_t *b_u32 = (const uint32_t *) &b->masks;
752 for (i = 0; i < FLOW_U32S; i++) {
753 if ((a_u32[i] & b_u32[i]) != b_u32[i]) {
760 /* Returns true if 'a' and 'b' are equal, except that 0-bits (wildcarded bits)
761 * in 'wc' do not need to be equal in 'a' and 'b'. */
763 flow_equal_except(const struct flow *a, const struct flow *b,
764 const struct flow_wildcards *wc)
766 const uint32_t *a_u32 = (const uint32_t *) a;
767 const uint32_t *b_u32 = (const uint32_t *) b;
768 const uint32_t *wc_u32 = (const uint32_t *) &wc->masks;
771 for (i = 0; i < FLOW_U32S; i++) {
772 if ((a_u32[i] ^ b_u32[i]) & wc_u32[i]) {
779 /* Sets the wildcard mask for register 'idx' in 'wc' to 'mask'.
780 * (A 0-bit indicates a wildcard bit.) */
782 flow_wildcards_set_reg_mask(struct flow_wildcards *wc, int idx, uint32_t mask)
784 wc->masks.regs[idx] = mask;
787 /* Hashes 'flow' based on its L2 through L4 protocol information. */
789 flow_hash_symmetric_l4(const struct flow *flow, uint32_t basis)
794 struct in6_addr ipv6_addr;
799 uint8_t eth_addr[ETH_ADDR_LEN];
805 memset(&fields, 0, sizeof fields);
806 for (i = 0; i < ETH_ADDR_LEN; i++) {
807 fields.eth_addr[i] = flow->dl_src[i] ^ flow->dl_dst[i];
809 fields.vlan_tci = flow->vlan_tci & htons(VLAN_VID_MASK);
810 fields.eth_type = flow->dl_type;
812 /* UDP source and destination port are not taken into account because they
813 * will not necessarily be symmetric in a bidirectional flow. */
814 if (fields.eth_type == htons(ETH_TYPE_IP)) {
815 fields.ipv4_addr = flow->nw_src ^ flow->nw_dst;
816 fields.ip_proto = flow->nw_proto;
817 if (fields.ip_proto == IPPROTO_TCP || fields.ip_proto == IPPROTO_SCTP) {
818 fields.tp_port = flow->tp_src ^ flow->tp_dst;
820 } else if (fields.eth_type == htons(ETH_TYPE_IPV6)) {
821 const uint8_t *a = &flow->ipv6_src.s6_addr[0];
822 const uint8_t *b = &flow->ipv6_dst.s6_addr[0];
823 uint8_t *ipv6_addr = &fields.ipv6_addr.s6_addr[0];
825 for (i=0; i<16; i++) {
826 ipv6_addr[i] = a[i] ^ b[i];
828 fields.ip_proto = flow->nw_proto;
829 if (fields.ip_proto == IPPROTO_TCP || fields.ip_proto == IPPROTO_SCTP) {
830 fields.tp_port = flow->tp_src ^ flow->tp_dst;
833 return jhash_bytes(&fields, sizeof fields, basis);
836 /* Initialize a flow with random fields that matter for nx_hash_fields. */
838 flow_random_hash_fields(struct flow *flow)
840 uint16_t rnd = random_uint16();
842 /* Initialize to all zeros. */
843 memset(flow, 0, sizeof *flow);
845 eth_addr_random(flow->dl_src);
846 eth_addr_random(flow->dl_dst);
848 flow->vlan_tci = (OVS_FORCE ovs_be16) (random_uint16() & VLAN_VID_MASK);
850 /* Make most of the random flows IPv4, some IPv6, and rest random. */
851 flow->dl_type = rnd < 0x8000 ? htons(ETH_TYPE_IP) :
852 rnd < 0xc000 ? htons(ETH_TYPE_IPV6) : (OVS_FORCE ovs_be16)rnd;
854 if (dl_type_is_ip_any(flow->dl_type)) {
855 if (flow->dl_type == htons(ETH_TYPE_IP)) {
856 flow->nw_src = (OVS_FORCE ovs_be32)random_uint32();
857 flow->nw_dst = (OVS_FORCE ovs_be32)random_uint32();
859 random_bytes(&flow->ipv6_src, sizeof flow->ipv6_src);
860 random_bytes(&flow->ipv6_dst, sizeof flow->ipv6_dst);
862 /* Make most of IP flows TCP, some UDP or SCTP, and rest random. */
863 rnd = random_uint16();
864 flow->nw_proto = rnd < 0x8000 ? IPPROTO_TCP :
865 rnd < 0xc000 ? IPPROTO_UDP :
866 rnd < 0xd000 ? IPPROTO_SCTP : (uint8_t)rnd;
867 if (flow->nw_proto == IPPROTO_TCP ||
868 flow->nw_proto == IPPROTO_UDP ||
869 flow->nw_proto == IPPROTO_SCTP) {
870 flow->tp_src = (OVS_FORCE ovs_be16)random_uint16();
871 flow->tp_dst = (OVS_FORCE ovs_be16)random_uint16();
876 /* Masks the fields in 'wc' that are used by the flow hash 'fields'. */
878 flow_mask_hash_fields(const struct flow *flow, struct flow_wildcards *wc,
879 enum nx_hash_fields fields)
882 case NX_HASH_FIELDS_ETH_SRC:
883 memset(&wc->masks.dl_src, 0xff, sizeof wc->masks.dl_src);
886 case NX_HASH_FIELDS_SYMMETRIC_L4:
887 memset(&wc->masks.dl_src, 0xff, sizeof wc->masks.dl_src);
888 memset(&wc->masks.dl_dst, 0xff, sizeof wc->masks.dl_dst);
889 if (flow->dl_type == htons(ETH_TYPE_IP)) {
890 memset(&wc->masks.nw_src, 0xff, sizeof wc->masks.nw_src);
891 memset(&wc->masks.nw_dst, 0xff, sizeof wc->masks.nw_dst);
892 } else if (flow->dl_type == htons(ETH_TYPE_IPV6)) {
893 memset(&wc->masks.ipv6_src, 0xff, sizeof wc->masks.ipv6_src);
894 memset(&wc->masks.ipv6_dst, 0xff, sizeof wc->masks.ipv6_dst);
896 if (is_ip_any(flow)) {
897 memset(&wc->masks.nw_proto, 0xff, sizeof wc->masks.nw_proto);
898 memset(&wc->masks.tp_src, 0xff, sizeof wc->masks.tp_src);
899 memset(&wc->masks.tp_dst, 0xff, sizeof wc->masks.tp_dst);
901 wc->masks.vlan_tci |= htons(VLAN_VID_MASK | VLAN_CFI);
909 /* Hashes the portions of 'flow' designated by 'fields'. */
911 flow_hash_fields(const struct flow *flow, enum nx_hash_fields fields,
916 case NX_HASH_FIELDS_ETH_SRC:
917 return jhash_bytes(flow->dl_src, sizeof flow->dl_src, basis);
919 case NX_HASH_FIELDS_SYMMETRIC_L4:
920 return flow_hash_symmetric_l4(flow, basis);
926 /* Returns a string representation of 'fields'. */
928 flow_hash_fields_to_str(enum nx_hash_fields fields)
931 case NX_HASH_FIELDS_ETH_SRC: return "eth_src";
932 case NX_HASH_FIELDS_SYMMETRIC_L4: return "symmetric_l4";
933 default: return "<unknown>";
937 /* Returns true if the value of 'fields' is supported. Otherwise false. */
939 flow_hash_fields_valid(enum nx_hash_fields fields)
941 return fields == NX_HASH_FIELDS_ETH_SRC
942 || fields == NX_HASH_FIELDS_SYMMETRIC_L4;
945 /* Returns a hash value for the bits of 'flow' that are active based on
946 * 'wc', given 'basis'. */
948 flow_hash_in_wildcards(const struct flow *flow,
949 const struct flow_wildcards *wc, uint32_t basis)
951 const uint32_t *wc_u32 = (const uint32_t *) &wc->masks;
952 const uint32_t *flow_u32 = (const uint32_t *) flow;
957 for (i = 0; i < FLOW_U32S; i++) {
958 hash = mhash_add(hash, flow_u32[i] & wc_u32[i]);
960 return mhash_finish(hash, 4 * FLOW_U32S);
963 /* Sets the VLAN VID that 'flow' matches to 'vid', which is interpreted as an
964 * OpenFlow 1.0 "dl_vlan" value:
966 * - If it is in the range 0...4095, 'flow->vlan_tci' is set to match
967 * that VLAN. Any existing PCP match is unchanged (it becomes 0 if
968 * 'flow' previously matched packets without a VLAN header).
970 * - If it is OFP_VLAN_NONE, 'flow->vlan_tci' is set to match a packet
971 * without a VLAN tag.
973 * - Other values of 'vid' should not be used. */
975 flow_set_dl_vlan(struct flow *flow, ovs_be16 vid)
977 if (vid == htons(OFP10_VLAN_NONE)) {
978 flow->vlan_tci = htons(0);
980 vid &= htons(VLAN_VID_MASK);
981 flow->vlan_tci &= ~htons(VLAN_VID_MASK);
982 flow->vlan_tci |= htons(VLAN_CFI) | vid;
986 /* Sets the VLAN VID that 'flow' matches to 'vid', which is interpreted as an
987 * OpenFlow 1.2 "vlan_vid" value, that is, the low 13 bits of 'vlan_tci' (VID
990 flow_set_vlan_vid(struct flow *flow, ovs_be16 vid)
992 ovs_be16 mask = htons(VLAN_VID_MASK | VLAN_CFI);
993 flow->vlan_tci &= ~mask;
994 flow->vlan_tci |= vid & mask;
997 /* Sets the VLAN PCP that 'flow' matches to 'pcp', which should be in the
1000 * This function has no effect on the VLAN ID that 'flow' matches.
1002 * After calling this function, 'flow' will not match packets without a VLAN
1005 flow_set_vlan_pcp(struct flow *flow, uint8_t pcp)
1008 flow->vlan_tci &= ~htons(VLAN_PCP_MASK);
1009 flow->vlan_tci |= htons((pcp << VLAN_PCP_SHIFT) | VLAN_CFI);
1012 /* Sets the MPLS Label that 'flow' matches to 'label', which is interpreted
1013 * as an OpenFlow 1.1 "mpls_label" value. */
1015 flow_set_mpls_label(struct flow *flow, ovs_be32 label)
1017 set_mpls_lse_label(&flow->mpls_lse, label);
1020 /* Sets the MPLS TTL that 'flow' matches to 'ttl', which should be in the
1023 flow_set_mpls_ttl(struct flow *flow, uint8_t ttl)
1025 set_mpls_lse_ttl(&flow->mpls_lse, ttl);
1028 /* Sets the MPLS TC that 'flow' matches to 'tc', which should be in the
1031 flow_set_mpls_tc(struct flow *flow, uint8_t tc)
1033 set_mpls_lse_tc(&flow->mpls_lse, tc);
1036 /* Sets the MPLS BOS bit that 'flow' matches to which should be 0 or 1. */
1038 flow_set_mpls_bos(struct flow *flow, uint8_t bos)
1040 set_mpls_lse_bos(&flow->mpls_lse, bos);
1043 /* Puts into 'b' a packet that flow_extract() would parse as having the given
1046 * (This is useful only for testing, obviously, and the packet isn't really
1047 * valid. It hasn't got some checksums filled in, for one, and lots of fields
1048 * are just zeroed.) */
1050 flow_compose(struct ofpbuf *b, const struct flow *flow)
1052 eth_compose(b, flow->dl_dst, flow->dl_src, ntohs(flow->dl_type), 0);
1053 if (flow->dl_type == htons(FLOW_DL_TYPE_NONE)) {
1054 struct eth_header *eth = b->l2;
1055 eth->eth_type = htons(b->size);
1059 if (flow->vlan_tci & htons(VLAN_CFI)) {
1060 eth_push_vlan(b, flow->vlan_tci);
1063 if (flow->dl_type == htons(ETH_TYPE_IP)) {
1064 struct ip_header *ip;
1066 b->l3 = ip = ofpbuf_put_zeros(b, sizeof *ip);
1067 ip->ip_ihl_ver = IP_IHL_VER(5, 4);
1068 ip->ip_tos = flow->nw_tos;
1069 ip->ip_ttl = flow->nw_ttl;
1070 ip->ip_proto = flow->nw_proto;
1071 put_16aligned_be32(&ip->ip_src, flow->nw_src);
1072 put_16aligned_be32(&ip->ip_dst, flow->nw_dst);
1074 if (flow->nw_frag & FLOW_NW_FRAG_ANY) {
1075 ip->ip_frag_off |= htons(IP_MORE_FRAGMENTS);
1076 if (flow->nw_frag & FLOW_NW_FRAG_LATER) {
1077 ip->ip_frag_off |= htons(100);
1080 if (!(flow->nw_frag & FLOW_NW_FRAG_ANY)
1081 || !(flow->nw_frag & FLOW_NW_FRAG_LATER)) {
1082 if (flow->nw_proto == IPPROTO_TCP) {
1083 struct tcp_header *tcp;
1085 b->l4 = tcp = ofpbuf_put_zeros(b, sizeof *tcp);
1086 tcp->tcp_src = flow->tp_src;
1087 tcp->tcp_dst = flow->tp_dst;
1088 tcp->tcp_ctl = TCP_CTL(ntohs(flow->tcp_flags), 5);
1089 } else if (flow->nw_proto == IPPROTO_UDP) {
1090 struct udp_header *udp;
1092 b->l4 = udp = ofpbuf_put_zeros(b, sizeof *udp);
1093 udp->udp_src = flow->tp_src;
1094 udp->udp_dst = flow->tp_dst;
1095 } else if (flow->nw_proto == IPPROTO_SCTP) {
1096 struct sctp_header *sctp;
1098 b->l4 = sctp = ofpbuf_put_zeros(b, sizeof *sctp);
1099 sctp->sctp_src = flow->tp_src;
1100 sctp->sctp_dst = flow->tp_dst;
1101 } else if (flow->nw_proto == IPPROTO_ICMP) {
1102 struct icmp_header *icmp;
1104 b->l4 = icmp = ofpbuf_put_zeros(b, sizeof *icmp);
1105 icmp->icmp_type = ntohs(flow->tp_src);
1106 icmp->icmp_code = ntohs(flow->tp_dst);
1107 icmp->icmp_csum = csum(icmp, ICMP_HEADER_LEN);
1109 b->l7 = ofpbuf_tail(b);
1113 ip->ip_tot_len = htons((uint8_t *) b->data + b->size
1114 - (uint8_t *) b->l3);
1115 ip->ip_csum = csum(ip, sizeof *ip);
1116 } else if (flow->dl_type == htons(ETH_TYPE_IPV6)) {
1118 } else if (flow->dl_type == htons(ETH_TYPE_ARP) ||
1119 flow->dl_type == htons(ETH_TYPE_RARP)) {
1120 struct arp_eth_header *arp;
1122 b->l3 = arp = ofpbuf_put_zeros(b, sizeof *arp);
1123 arp->ar_hrd = htons(1);
1124 arp->ar_pro = htons(ETH_TYPE_IP);
1125 arp->ar_hln = ETH_ADDR_LEN;
1127 arp->ar_op = htons(flow->nw_proto);
1129 if (flow->nw_proto == ARP_OP_REQUEST ||
1130 flow->nw_proto == ARP_OP_REPLY) {
1131 put_16aligned_be32(&arp->ar_spa, flow->nw_src);
1132 put_16aligned_be32(&arp->ar_tpa, flow->nw_dst);
1133 memcpy(arp->ar_sha, flow->arp_sha, ETH_ADDR_LEN);
1134 memcpy(arp->ar_tha, flow->arp_tha, ETH_ADDR_LEN);
1138 if (eth_type_mpls(flow->dl_type)) {
1140 push_mpls(b, flow->dl_type, flow->mpls_lse);
1144 /* Compressed flow. */
1147 miniflow_n_values(const struct miniflow *flow)
1149 return count_1bits(flow->map);
1153 miniflow_alloc_values(struct miniflow *flow, int n)
1155 if (n <= MINI_N_INLINE) {
1156 return flow->inline_values;
1158 COVERAGE_INC(miniflow_malloc);
1159 return xmalloc(n * sizeof *flow->values);
1163 /* Completes an initialization of 'dst' as a miniflow copy of 'src' begun by
1164 * the caller. The caller must have already initialized 'dst->map' properly
1165 * to indicate the nonzero uint32_t elements of 'src'. 'n' must be the number
1166 * of 1-bits in 'dst->map'.
1168 * This function initializes 'dst->values' (either inline if possible or with
1169 * malloc() otherwise) and copies the nonzero uint32_t elements of 'src' into
1172 miniflow_init__(struct miniflow *dst, const struct flow *src, int n)
1174 const uint32_t *src_u32 = (const uint32_t *) src;
1178 dst->values = miniflow_alloc_values(dst, n);
1180 for (map = dst->map; map; map = zero_rightmost_1bit(map)) {
1181 dst->values[ofs++] = src_u32[raw_ctz(map)];
1185 /* Initializes 'dst' as a copy of 'src'. The caller must eventually free 'dst'
1186 * with miniflow_destroy(). */
1188 miniflow_init(struct miniflow *dst, const struct flow *src)
1190 const uint32_t *src_u32 = (const uint32_t *) src;
1194 /* Initialize dst->map, counting the number of nonzero elements. */
1198 for (i = 0; i < FLOW_U32S; i++) {
1200 dst->map |= UINT64_C(1) << i;
1205 miniflow_init__(dst, src, n);
1208 /* Initializes 'dst' as a copy of 'src', using 'mask->map' as 'dst''s map. The
1209 * caller must eventually free 'dst' with miniflow_destroy(). */
1211 miniflow_init_with_minimask(struct miniflow *dst, const struct flow *src,
1212 const struct minimask *mask)
1214 dst->map = mask->masks.map;
1215 miniflow_init__(dst, src, miniflow_n_values(dst));
1218 /* Initializes 'dst' as a copy of 'src'. The caller must eventually free 'dst'
1219 * with miniflow_destroy(). */
1221 miniflow_clone(struct miniflow *dst, const struct miniflow *src)
1223 int n = miniflow_n_values(src);
1224 dst->map = src->map;
1225 dst->values = miniflow_alloc_values(dst, n);
1226 memcpy(dst->values, src->values, n * sizeof *dst->values);
1229 /* Initializes 'dst' with the data in 'src', destroying 'src'.
1230 * The caller must eventually free 'dst' with miniflow_destroy(). */
1232 miniflow_move(struct miniflow *dst, struct miniflow *src)
1234 if (src->values == src->inline_values) {
1235 dst->values = dst->inline_values;
1236 memcpy(dst->values, src->values,
1237 miniflow_n_values(src) * sizeof *dst->values);
1239 dst->values = src->values;
1241 dst->map = src->map;
1244 /* Frees any memory owned by 'flow'. Does not free the storage in which 'flow'
1245 * itself resides; the caller is responsible for that. */
1247 miniflow_destroy(struct miniflow *flow)
1249 if (flow->values != flow->inline_values) {
1254 /* Initializes 'dst' as a copy of 'src'. */
1256 miniflow_expand(const struct miniflow *src, struct flow *dst)
1258 memset(dst, 0, sizeof *dst);
1259 flow_union_with_miniflow(dst, src);
1262 static const uint32_t *
1263 miniflow_get__(const struct miniflow *flow, unsigned int u32_ofs)
1265 if (!(flow->map & (UINT64_C(1) << u32_ofs))) {
1266 static const uint32_t zero = 0;
1269 return flow->values +
1270 count_1bits(flow->map & ((UINT64_C(1) << u32_ofs) - 1));
1273 /* Returns the uint32_t that would be at byte offset '4 * u32_ofs' if 'flow'
1274 * were expanded into a "struct flow". */
1276 miniflow_get(const struct miniflow *flow, unsigned int u32_ofs)
1278 return *miniflow_get__(flow, u32_ofs);
1281 /* Returns the ovs_be16 that would be at byte offset 'u8_ofs' if 'flow' were
1282 * expanded into a "struct flow". */
1284 miniflow_get_be16(const struct miniflow *flow, unsigned int u8_ofs)
1286 const uint32_t *u32p = miniflow_get__(flow, u8_ofs / 4);
1287 const ovs_be16 *be16p = (const ovs_be16 *) u32p;
1288 return be16p[u8_ofs % 4 != 0];
1291 /* Returns the VID within the vlan_tci member of the "struct flow" represented
1294 miniflow_get_vid(const struct miniflow *flow)
1296 ovs_be16 tci = miniflow_get_be16(flow, offsetof(struct flow, vlan_tci));
1297 return vlan_tci_to_vid(tci);
1300 /* Returns true if 'a' and 'b' are the same flow, false otherwise. */
1302 miniflow_equal(const struct miniflow *a, const struct miniflow *b)
1304 const uint32_t *ap = a->values;
1305 const uint32_t *bp = b->values;
1306 const uint64_t a_map = a->map;
1307 const uint64_t b_map = b->map;
1310 if (a_map == b_map) {
1311 for (map = a_map; map; map = zero_rightmost_1bit(map)) {
1312 if (*ap++ != *bp++) {
1317 for (map = a_map | b_map; map; map = zero_rightmost_1bit(map)) {
1318 uint64_t bit = rightmost_1bit(map);
1319 uint64_t a_value = a_map & bit ? *ap++ : 0;
1320 uint64_t b_value = b_map & bit ? *bp++ : 0;
1322 if (a_value != b_value) {
1331 /* Returns true if 'a' and 'b' are equal at the places where there are 1-bits
1332 * in 'mask', false if they differ. */
1334 miniflow_equal_in_minimask(const struct miniflow *a, const struct miniflow *b,
1335 const struct minimask *mask)
1340 p = mask->masks.values;
1342 for (map = mask->masks.map; map; map = zero_rightmost_1bit(map)) {
1343 int ofs = raw_ctz(map);
1345 if ((miniflow_get(a, ofs) ^ miniflow_get(b, ofs)) & *p) {
1354 /* Returns true if 'a' and 'b' are equal at the places where there are 1-bits
1355 * in 'mask', false if they differ. */
1357 miniflow_equal_flow_in_minimask(const struct miniflow *a, const struct flow *b,
1358 const struct minimask *mask)
1360 const uint32_t *b_u32 = (const uint32_t *) b;
1364 p = mask->masks.values;
1366 for (map = mask->masks.map; map; map = zero_rightmost_1bit(map)) {
1367 int ofs = raw_ctz(map);
1369 if ((miniflow_get(a, ofs) ^ b_u32[ofs]) & *p) {
1378 /* Returns a hash value for 'flow', given 'basis'. */
1380 miniflow_hash(const struct miniflow *flow, uint32_t basis)
1382 const uint32_t *p = flow->values;
1383 uint32_t hash = basis;
1384 uint64_t hash_map = 0;
1387 for (map = flow->map; map; map = zero_rightmost_1bit(map)) {
1389 hash = mhash_add(hash, *p);
1390 hash_map |= rightmost_1bit(map);
1394 hash = mhash_add(hash, hash_map);
1395 hash = mhash_add(hash, hash_map >> 32);
1397 return mhash_finish(hash, p - flow->values);
1400 /* Returns a hash value for the bits of 'flow' where there are 1-bits in
1401 * 'mask', given 'basis'.
1403 * The hash values returned by this function are the same as those returned by
1404 * flow_hash_in_minimask(), only the form of the arguments differ. */
1406 miniflow_hash_in_minimask(const struct miniflow *flow,
1407 const struct minimask *mask, uint32_t basis)
1409 const uint32_t *p = mask->masks.values;
1415 for (map = mask->masks.map; map; map = zero_rightmost_1bit(map)) {
1417 int ofs = raw_ctz(map);
1418 hash = mhash_add(hash, miniflow_get(flow, ofs) & *p);
1423 return mhash_finish(hash, (p - mask->masks.values) * 4);
1426 /* Returns a hash value for the bits of 'flow' where there are 1-bits in
1427 * 'mask', given 'basis'.
1429 * The hash values returned by this function are the same as those returned by
1430 * miniflow_hash_in_minimask(), only the form of the arguments differ. */
1432 flow_hash_in_minimask(const struct flow *flow, const struct minimask *mask,
1435 const uint32_t *flow_u32 = (const uint32_t *)flow;
1436 const uint32_t *p = mask->masks.values;
1441 for (map = mask->masks.map; map; map = zero_rightmost_1bit(map)) {
1443 hash = mhash_add(hash, flow_u32[raw_ctz(map)] & *p);
1448 return mhash_finish(hash, (p - mask->masks.values) * 4);
1451 /* Returns a hash value for the bits of range [start, end) in 'flow',
1452 * where there are 1-bits in 'mask', given 'hash'.
1454 * The hash values returned by this function are the same as those returned by
1455 * minimatch_hash_range(), only the form of the arguments differ. */
1457 flow_hash_in_minimask_range(const struct flow *flow,
1458 const struct minimask *mask,
1459 uint8_t start, uint8_t end, uint32_t *basis)
1461 const uint32_t *flow_u32 = (const uint32_t *)flow;
1463 uint64_t map = miniflow_get_map_in_range(&mask->masks, start, end, &p);
1464 uint32_t hash = *basis;
1466 for (; map; map = zero_rightmost_1bit(map)) {
1468 hash = mhash_add(hash, flow_u32[raw_ctz(map)] & *p);
1473 *basis = hash; /* Allow continuation from the unfinished value. */
1474 return mhash_finish(hash, (p - mask->masks.values) * 4);
1478 /* Initializes 'dst' as a copy of 'src'. The caller must eventually free 'dst'
1479 * with minimask_destroy(). */
1481 minimask_init(struct minimask *mask, const struct flow_wildcards *wc)
1483 miniflow_init(&mask->masks, &wc->masks);
1486 /* Initializes 'dst' as a copy of 'src'. The caller must eventually free 'dst'
1487 * with minimask_destroy(). */
1489 minimask_clone(struct minimask *dst, const struct minimask *src)
1491 miniflow_clone(&dst->masks, &src->masks);
1494 /* Initializes 'dst' with the data in 'src', destroying 'src'.
1495 * The caller must eventually free 'dst' with minimask_destroy(). */
1497 minimask_move(struct minimask *dst, struct minimask *src)
1499 miniflow_move(&dst->masks, &src->masks);
1502 /* Initializes 'dst_' as the bit-wise "and" of 'a_' and 'b_'.
1504 * The caller must provide room for FLOW_U32S "uint32_t"s in 'storage', for use
1505 * by 'dst_'. The caller must *not* free 'dst_' with minimask_destroy(). */
1507 minimask_combine(struct minimask *dst_,
1508 const struct minimask *a_, const struct minimask *b_,
1509 uint32_t storage[FLOW_U32S])
1511 struct miniflow *dst = &dst_->masks;
1512 const struct miniflow *a = &a_->masks;
1513 const struct miniflow *b = &b_->masks;
1517 dst->values = storage;
1520 for (map = a->map & b->map; map; map = zero_rightmost_1bit(map)) {
1521 int ofs = raw_ctz(map);
1522 uint32_t mask = miniflow_get(a, ofs) & miniflow_get(b, ofs);
1525 dst->map |= rightmost_1bit(map);
1526 dst->values[n++] = mask;
1531 /* Frees any memory owned by 'mask'. Does not free the storage in which 'mask'
1532 * itself resides; the caller is responsible for that. */
1534 minimask_destroy(struct minimask *mask)
1536 miniflow_destroy(&mask->masks);
1539 /* Initializes 'dst' as a copy of 'src'. */
1541 minimask_expand(const struct minimask *mask, struct flow_wildcards *wc)
1543 miniflow_expand(&mask->masks, &wc->masks);
1546 /* Returns the uint32_t that would be at byte offset '4 * u32_ofs' if 'mask'
1547 * were expanded into a "struct flow_wildcards". */
1549 minimask_get(const struct minimask *mask, unsigned int u32_ofs)
1551 return miniflow_get(&mask->masks, u32_ofs);
1554 /* Returns the VID mask within the vlan_tci member of the "struct
1555 * flow_wildcards" represented by 'mask'. */
1557 minimask_get_vid_mask(const struct minimask *mask)
1559 return miniflow_get_vid(&mask->masks);
1562 /* Returns true if 'a' and 'b' are the same flow mask, false otherwise. */
1564 minimask_equal(const struct minimask *a, const struct minimask *b)
1566 return miniflow_equal(&a->masks, &b->masks);
1569 /* Returns a hash value for 'mask', given 'basis'. */
1571 minimask_hash(const struct minimask *mask, uint32_t basis)
1573 return miniflow_hash(&mask->masks, basis);
1576 /* Returns true if at least one bit is wildcarded in 'a_' but not in 'b_',
1577 * false otherwise. */
1579 minimask_has_extra(const struct minimask *a_, const struct minimask *b_)
1581 const struct miniflow *a = &a_->masks;
1582 const struct miniflow *b = &b_->masks;
1585 for (map = a->map | b->map; map; map = zero_rightmost_1bit(map)) {
1586 int ofs = raw_ctz(map);
1587 uint32_t a_u32 = miniflow_get(a, ofs);
1588 uint32_t b_u32 = miniflow_get(b, ofs);
1590 if ((a_u32 & b_u32) != b_u32) {
1598 /* Returns true if 'mask' matches every packet, false if 'mask' fixes any bits
1601 minimask_is_catchall(const struct minimask *mask_)
1603 const struct miniflow *mask = &mask_->masks;
1604 const uint32_t *p = mask->values;
1607 for (map = mask->map; map; map = zero_rightmost_1bit(map)) {