2 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
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))) {
115 ovs_be32 mpls_lse = get_16aligned_be32(&mh->mpls_lse);
118 flow->mpls_lse = mpls_lse;
120 if (mpls_lse & htonl(MPLS_BOS_MASK)) {
127 parse_vlan(struct ofpbuf *b, struct flow *flow)
130 ovs_be16 eth_type; /* ETH_TYPE_VLAN */
134 if (b->size >= sizeof(struct qtag_prefix) + sizeof(ovs_be16)) {
135 struct qtag_prefix *qp = ofpbuf_pull(b, sizeof *qp);
136 flow->vlan_tci = qp->tci | htons(VLAN_CFI);
141 parse_ethertype(struct ofpbuf *b)
143 struct llc_snap_header *llc;
146 proto = *(ovs_be16 *) ofpbuf_pull(b, sizeof proto);
147 if (ntohs(proto) >= ETH_TYPE_MIN) {
151 if (b->size < sizeof *llc) {
152 return htons(FLOW_DL_TYPE_NONE);
156 if (llc->llc.llc_dsap != LLC_DSAP_SNAP
157 || llc->llc.llc_ssap != LLC_SSAP_SNAP
158 || llc->llc.llc_cntl != LLC_CNTL_SNAP
159 || memcmp(llc->snap.snap_org, SNAP_ORG_ETHERNET,
160 sizeof llc->snap.snap_org)) {
161 return htons(FLOW_DL_TYPE_NONE);
164 ofpbuf_pull(b, sizeof *llc);
166 if (ntohs(llc->snap.snap_type) >= ETH_TYPE_MIN) {
167 return llc->snap.snap_type;
170 return htons(FLOW_DL_TYPE_NONE);
174 parse_ipv6(struct ofpbuf *packet, struct flow *flow)
176 const struct ovs_16aligned_ip6_hdr *nh;
180 nh = ofpbuf_try_pull(packet, sizeof *nh);
185 nexthdr = nh->ip6_nxt;
187 memcpy(&flow->ipv6_src, &nh->ip6_src, sizeof flow->ipv6_src);
188 memcpy(&flow->ipv6_dst, &nh->ip6_dst, sizeof flow->ipv6_dst);
190 tc_flow = get_16aligned_be32(&nh->ip6_flow);
191 flow->nw_tos = ntohl(tc_flow) >> 20;
192 flow->ipv6_label = tc_flow & htonl(IPV6_LABEL_MASK);
193 flow->nw_ttl = nh->ip6_hlim;
194 flow->nw_proto = IPPROTO_NONE;
197 if ((nexthdr != IPPROTO_HOPOPTS)
198 && (nexthdr != IPPROTO_ROUTING)
199 && (nexthdr != IPPROTO_DSTOPTS)
200 && (nexthdr != IPPROTO_AH)
201 && (nexthdr != IPPROTO_FRAGMENT)) {
202 /* It's either a terminal header (e.g., TCP, UDP) or one we
203 * don't understand. In either case, we're done with the
204 * packet, so use it to fill in 'nw_proto'. */
208 /* We only verify that at least 8 bytes of the next header are
209 * available, but many of these headers are longer. Ensure that
210 * accesses within the extension header are within those first 8
211 * bytes. All extension headers are required to be at least 8
213 if (packet->size < 8) {
217 if ((nexthdr == IPPROTO_HOPOPTS)
218 || (nexthdr == IPPROTO_ROUTING)
219 || (nexthdr == IPPROTO_DSTOPTS)) {
220 /* These headers, while different, have the fields we care about
221 * in the same location and with the same interpretation. */
222 const struct ip6_ext *ext_hdr = packet->data;
223 nexthdr = ext_hdr->ip6e_nxt;
224 if (!ofpbuf_try_pull(packet, (ext_hdr->ip6e_len + 1) * 8)) {
227 } else if (nexthdr == IPPROTO_AH) {
228 /* A standard AH definition isn't available, but the fields
229 * we care about are in the same location as the generic
230 * option header--only the header length is calculated
232 const struct ip6_ext *ext_hdr = packet->data;
233 nexthdr = ext_hdr->ip6e_nxt;
234 if (!ofpbuf_try_pull(packet, (ext_hdr->ip6e_len + 2) * 4)) {
237 } else if (nexthdr == IPPROTO_FRAGMENT) {
238 const struct ovs_16aligned_ip6_frag *frag_hdr = packet->data;
240 nexthdr = frag_hdr->ip6f_nxt;
241 if (!ofpbuf_try_pull(packet, sizeof *frag_hdr)) {
245 /* We only process the first fragment. */
246 if (frag_hdr->ip6f_offlg != htons(0)) {
247 flow->nw_frag = FLOW_NW_FRAG_ANY;
248 if ((frag_hdr->ip6f_offlg & IP6F_OFF_MASK) != htons(0)) {
249 flow->nw_frag |= FLOW_NW_FRAG_LATER;
250 nexthdr = IPPROTO_FRAGMENT;
257 flow->nw_proto = nexthdr;
262 parse_tcp(struct ofpbuf *packet, struct ofpbuf *b, struct flow *flow)
264 const struct tcp_header *tcp = pull_tcp(b);
266 flow->tp_src = tcp->tcp_src;
267 flow->tp_dst = tcp->tcp_dst;
268 flow->tcp_flags = tcp->tcp_ctl & htons(0x0fff);
269 packet->l7 = b->data;
274 parse_udp(struct ofpbuf *packet, struct ofpbuf *b, struct flow *flow)
276 const struct udp_header *udp = pull_udp(b);
278 flow->tp_src = udp->udp_src;
279 flow->tp_dst = udp->udp_dst;
280 packet->l7 = b->data;
285 parse_sctp(struct ofpbuf *packet, struct ofpbuf *b, struct flow *flow)
287 const struct sctp_header *sctp = pull_sctp(b);
289 flow->tp_src = sctp->sctp_src;
290 flow->tp_dst = sctp->sctp_dst;
291 packet->l7 = b->data;
296 parse_icmpv6(struct ofpbuf *b, struct flow *flow)
298 const struct icmp6_hdr *icmp = pull_icmpv6(b);
304 /* The ICMPv6 type and code fields use the 16-bit transport port
305 * fields, so we need to store them in 16-bit network byte order. */
306 flow->tp_src = htons(icmp->icmp6_type);
307 flow->tp_dst = htons(icmp->icmp6_code);
309 if (icmp->icmp6_code == 0 &&
310 (icmp->icmp6_type == ND_NEIGHBOR_SOLICIT ||
311 icmp->icmp6_type == ND_NEIGHBOR_ADVERT)) {
312 const struct in6_addr *nd_target;
314 nd_target = ofpbuf_try_pull(b, sizeof *nd_target);
318 flow->nd_target = *nd_target;
320 while (b->size >= 8) {
321 /* The minimum size of an option is 8 bytes, which also is
322 * the size of Ethernet link-layer options. */
323 const struct nd_opt_hdr *nd_opt = b->data;
324 int opt_len = nd_opt->nd_opt_len * 8;
326 if (!opt_len || opt_len > b->size) {
330 /* Store the link layer address if the appropriate option is
331 * provided. It is considered an error if the same link
332 * layer option is specified twice. */
333 if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LINKADDR
335 if (eth_addr_is_zero(flow->arp_sha)) {
336 memcpy(flow->arp_sha, nd_opt + 1, ETH_ADDR_LEN);
340 } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LINKADDR
342 if (eth_addr_is_zero(flow->arp_tha)) {
343 memcpy(flow->arp_tha, nd_opt + 1, ETH_ADDR_LEN);
349 if (!ofpbuf_try_pull(b, opt_len)) {
358 memset(&flow->nd_target, 0, sizeof(flow->nd_target));
359 memset(flow->arp_sha, 0, sizeof(flow->arp_sha));
360 memset(flow->arp_tha, 0, sizeof(flow->arp_tha));
366 /* Initializes 'flow' members from 'packet', 'skb_priority', 'tnl', and
369 * Initializes 'packet' header pointers as follows:
371 * - packet->l2 to the start of the Ethernet header.
373 * - packet->l2_5 to the start of the MPLS shim header.
375 * - packet->l3 to just past the Ethernet header, or just past the
376 * vlan_header if one is present, to the first byte of the payload of the
379 * - packet->l4 to just past the IPv4 header, if one is present and has a
380 * correct length, and otherwise NULL.
382 * - packet->l7 to just past the TCP/UDP/SCTP/ICMP header, if one is
383 * present and has a correct length, and otherwise NULL.
386 flow_extract(struct ofpbuf *packet, uint32_t skb_priority, uint32_t pkt_mark,
387 const struct flow_tnl *tnl, const union flow_in_port *in_port,
390 struct ofpbuf b = *packet;
391 struct eth_header *eth;
393 COVERAGE_INC(flow_extract);
395 memset(flow, 0, sizeof *flow);
398 ovs_assert(tnl != &flow->tunnel);
402 flow->in_port = *in_port;
404 flow->skb_priority = skb_priority;
405 flow->pkt_mark = pkt_mark;
413 if (b.size < sizeof *eth) {
419 memcpy(flow->dl_src, eth->eth_src, ETH_ADDR_LEN);
420 memcpy(flow->dl_dst, eth->eth_dst, ETH_ADDR_LEN);
422 /* dl_type, vlan_tci. */
423 ofpbuf_pull(&b, ETH_ADDR_LEN * 2);
424 if (eth->eth_type == htons(ETH_TYPE_VLAN)) {
425 parse_vlan(&b, flow);
427 flow->dl_type = parse_ethertype(&b);
429 /* Parse mpls, copy l3 ttl. */
430 if (eth_type_mpls(flow->dl_type)) {
431 packet->l2_5 = b.data;
432 parse_mpls(&b, flow);
437 if (flow->dl_type == htons(ETH_TYPE_IP)) {
438 const struct ip_header *nh = pull_ip(&b);
442 flow->nw_src = get_16aligned_be32(&nh->ip_src);
443 flow->nw_dst = get_16aligned_be32(&nh->ip_dst);
444 flow->nw_proto = nh->ip_proto;
446 flow->nw_tos = nh->ip_tos;
447 if (IP_IS_FRAGMENT(nh->ip_frag_off)) {
448 flow->nw_frag = FLOW_NW_FRAG_ANY;
449 if (nh->ip_frag_off & htons(IP_FRAG_OFF_MASK)) {
450 flow->nw_frag |= FLOW_NW_FRAG_LATER;
453 flow->nw_ttl = nh->ip_ttl;
455 if (!(nh->ip_frag_off & htons(IP_FRAG_OFF_MASK))) {
456 if (flow->nw_proto == IPPROTO_TCP) {
457 parse_tcp(packet, &b, flow);
458 } else if (flow->nw_proto == IPPROTO_UDP) {
459 parse_udp(packet, &b, flow);
460 } else if (flow->nw_proto == IPPROTO_SCTP) {
461 parse_sctp(packet, &b, flow);
462 } else if (flow->nw_proto == IPPROTO_ICMP) {
463 const struct icmp_header *icmp = pull_icmp(&b);
465 flow->tp_src = htons(icmp->icmp_type);
466 flow->tp_dst = htons(icmp->icmp_code);
472 } else if (flow->dl_type == htons(ETH_TYPE_IPV6)) {
473 if (parse_ipv6(&b, flow)) {
478 if (flow->nw_proto == IPPROTO_TCP) {
479 parse_tcp(packet, &b, flow);
480 } else if (flow->nw_proto == IPPROTO_UDP) {
481 parse_udp(packet, &b, flow);
482 } else if (flow->nw_proto == IPPROTO_SCTP) {
483 parse_sctp(packet, &b, flow);
484 } else if (flow->nw_proto == IPPROTO_ICMPV6) {
485 if (parse_icmpv6(&b, flow)) {
489 } else if (flow->dl_type == htons(ETH_TYPE_ARP) ||
490 flow->dl_type == htons(ETH_TYPE_RARP)) {
491 const struct arp_eth_header *arp = pull_arp(&b);
492 if (arp && arp->ar_hrd == htons(1)
493 && arp->ar_pro == htons(ETH_TYPE_IP)
494 && arp->ar_hln == ETH_ADDR_LEN
495 && arp->ar_pln == 4) {
496 /* We only match on the lower 8 bits of the opcode. */
497 if (ntohs(arp->ar_op) <= 0xff) {
498 flow->nw_proto = ntohs(arp->ar_op);
501 flow->nw_src = get_16aligned_be32(&arp->ar_spa);
502 flow->nw_dst = get_16aligned_be32(&arp->ar_tpa);
503 memcpy(flow->arp_sha, arp->ar_sha, ETH_ADDR_LEN);
504 memcpy(flow->arp_tha, arp->ar_tha, ETH_ADDR_LEN);
509 /* For every bit of a field that is wildcarded in 'wildcards', sets the
510 * corresponding bit in 'flow' to zero. */
512 flow_zero_wildcards(struct flow *flow, const struct flow_wildcards *wildcards)
514 uint32_t *flow_u32 = (uint32_t *) flow;
515 const uint32_t *wc_u32 = (const uint32_t *) &wildcards->masks;
518 for (i = 0; i < FLOW_U32S; i++) {
519 flow_u32[i] &= wc_u32[i];
524 flow_unwildcard_tp_ports(const struct flow *flow, struct flow_wildcards *wc)
526 if (flow->nw_proto != IPPROTO_ICMP) {
527 memset(&wc->masks.tp_src, 0xff, sizeof wc->masks.tp_src);
528 memset(&wc->masks.tp_dst, 0xff, sizeof wc->masks.tp_dst);
530 wc->masks.tp_src = htons(0xff);
531 wc->masks.tp_dst = htons(0xff);
535 /* Initializes 'fmd' with the metadata found in 'flow'. */
537 flow_get_metadata(const struct flow *flow, struct flow_metadata *fmd)
539 BUILD_ASSERT_DECL(FLOW_WC_SEQ == 23);
541 fmd->tun_id = flow->tunnel.tun_id;
542 fmd->tun_src = flow->tunnel.ip_src;
543 fmd->tun_dst = flow->tunnel.ip_dst;
544 fmd->metadata = flow->metadata;
545 memcpy(fmd->regs, flow->regs, sizeof fmd->regs);
546 fmd->pkt_mark = flow->pkt_mark;
547 fmd->in_port = flow->in_port.ofp_port;
551 flow_to_string(const struct flow *flow)
553 struct ds ds = DS_EMPTY_INITIALIZER;
554 flow_format(&ds, flow);
559 flow_tun_flag_to_string(uint32_t flags)
562 case FLOW_TNL_F_DONT_FRAGMENT:
564 case FLOW_TNL_F_CSUM:
574 format_flags(struct ds *ds, const char *(*bit_to_string)(uint32_t),
575 uint32_t flags, char del)
583 uint32_t bit = rightmost_1bit(flags);
586 s = bit_to_string(bit);
588 ds_put_format(ds, "%s%c", s, del);
597 ds_put_format(ds, "0x%"PRIx32"%c", bad, del);
603 format_flags_masked(struct ds *ds, const char *name,
604 const char *(*bit_to_string)(uint32_t), uint32_t flags,
608 ds_put_format(ds, "%s=", name);
611 uint32_t bit = rightmost_1bit(mask);
612 const char *s = bit_to_string(bit);
614 ds_put_format(ds, "%s%s", (flags & bit) ? "+" : "-",
615 s ? s : "[Unknown]");
621 flow_format(struct ds *ds, const struct flow *flow)
625 match_wc_init(&match, flow);
626 match_format(&match, ds, OFP_DEFAULT_PRIORITY);
630 flow_print(FILE *stream, const struct flow *flow)
632 char *s = flow_to_string(flow);
637 /* flow_wildcards functions. */
639 /* Initializes 'wc' as a set of wildcards that matches every packet. */
641 flow_wildcards_init_catchall(struct flow_wildcards *wc)
643 memset(&wc->masks, 0, sizeof wc->masks);
646 /* Clear the metadata and register wildcard masks. They are not packet
649 flow_wildcards_clear_non_packet_fields(struct flow_wildcards *wc)
651 memset(&wc->masks.metadata, 0, sizeof wc->masks.metadata);
652 memset(&wc->masks.regs, 0, sizeof wc->masks.regs);
655 /* Returns true if 'wc' matches every packet, false if 'wc' fixes any bits or
658 flow_wildcards_is_catchall(const struct flow_wildcards *wc)
660 const uint32_t *wc_u32 = (const uint32_t *) &wc->masks;
663 for (i = 0; i < FLOW_U32S; i++) {
671 /* Sets 'dst' as the bitwise AND of wildcards in 'src1' and 'src2'.
672 * That is, a bit or a field is wildcarded in 'dst' if it is wildcarded
673 * in 'src1' or 'src2' or both. */
675 flow_wildcards_and(struct flow_wildcards *dst,
676 const struct flow_wildcards *src1,
677 const struct flow_wildcards *src2)
679 uint32_t *dst_u32 = (uint32_t *) &dst->masks;
680 const uint32_t *src1_u32 = (const uint32_t *) &src1->masks;
681 const uint32_t *src2_u32 = (const uint32_t *) &src2->masks;
684 for (i = 0; i < FLOW_U32S; i++) {
685 dst_u32[i] = src1_u32[i] & src2_u32[i];
689 /* Sets 'dst' as the bitwise OR of wildcards in 'src1' and 'src2'. That
690 * is, a bit or a field is wildcarded in 'dst' if it is neither
691 * wildcarded in 'src1' nor 'src2'. */
693 flow_wildcards_or(struct flow_wildcards *dst,
694 const struct flow_wildcards *src1,
695 const struct flow_wildcards *src2)
697 uint32_t *dst_u32 = (uint32_t *) &dst->masks;
698 const uint32_t *src1_u32 = (const uint32_t *) &src1->masks;
699 const uint32_t *src2_u32 = (const uint32_t *) &src2->masks;
702 for (i = 0; i < FLOW_U32S; i++) {
703 dst_u32[i] = src1_u32[i] | src2_u32[i];
707 /* Perform a bitwise OR of miniflow 'src' flow data with the equivalent
708 * fields in 'dst', storing the result in 'dst'. */
710 flow_union_with_miniflow(struct flow *dst, const struct miniflow *src)
712 uint32_t *dst_u32 = (uint32_t *) dst;
713 const uint32_t *p = src->values;
716 for (map = src->map; map; map = zero_rightmost_1bit(map)) {
717 dst_u32[raw_ctz(map)] |= *p++;
721 /* Fold minimask 'mask''s wildcard mask into 'wc's wildcard mask. */
723 flow_wildcards_fold_minimask(struct flow_wildcards *wc,
724 const struct minimask *mask)
726 flow_union_with_miniflow(&wc->masks, &mask->masks);
730 miniflow_get_map_in_range(const struct miniflow *miniflow,
731 uint8_t start, uint8_t end, unsigned int *offset)
733 uint64_t map = miniflow->map;
737 uint64_t msk = (UINT64_C(1) << start) - 1; /* 'start' LSBs set */
738 *offset = count_1bits(map & msk);
741 if (end < FLOW_U32S) {
742 uint64_t msk = (UINT64_C(1) << end) - 1; /* 'end' LSBs set */
748 /* Fold minimask 'mask''s wildcard mask into 'wc's wildcard mask
749 * in range [start, end). */
751 flow_wildcards_fold_minimask_range(struct flow_wildcards *wc,
752 const struct minimask *mask,
753 uint8_t start, uint8_t end)
755 uint32_t *dst_u32 = (uint32_t *)&wc->masks;
757 uint64_t map = miniflow_get_map_in_range(&mask->masks, start, end,
759 const uint32_t *p = mask->masks.values + offset;
761 for (; map; map = zero_rightmost_1bit(map)) {
762 dst_u32[raw_ctz(map)] |= *p++;
766 /* Returns a hash of the wildcards in 'wc'. */
768 flow_wildcards_hash(const struct flow_wildcards *wc, uint32_t basis)
770 return flow_hash(&wc->masks, basis);
773 /* Returns true if 'a' and 'b' represent the same wildcards, false if they are
776 flow_wildcards_equal(const struct flow_wildcards *a,
777 const struct flow_wildcards *b)
779 return flow_equal(&a->masks, &b->masks);
782 /* Returns true if at least one bit or field is wildcarded in 'a' but not in
783 * 'b', false otherwise. */
785 flow_wildcards_has_extra(const struct flow_wildcards *a,
786 const struct flow_wildcards *b)
788 const uint32_t *a_u32 = (const uint32_t *) &a->masks;
789 const uint32_t *b_u32 = (const uint32_t *) &b->masks;
792 for (i = 0; i < FLOW_U32S; i++) {
793 if ((a_u32[i] & b_u32[i]) != b_u32[i]) {
800 /* Returns true if 'a' and 'b' are equal, except that 0-bits (wildcarded bits)
801 * in 'wc' do not need to be equal in 'a' and 'b'. */
803 flow_equal_except(const struct flow *a, const struct flow *b,
804 const struct flow_wildcards *wc)
806 const uint32_t *a_u32 = (const uint32_t *) a;
807 const uint32_t *b_u32 = (const uint32_t *) b;
808 const uint32_t *wc_u32 = (const uint32_t *) &wc->masks;
811 for (i = 0; i < FLOW_U32S; i++) {
812 if ((a_u32[i] ^ b_u32[i]) & wc_u32[i]) {
819 /* Sets the wildcard mask for register 'idx' in 'wc' to 'mask'.
820 * (A 0-bit indicates a wildcard bit.) */
822 flow_wildcards_set_reg_mask(struct flow_wildcards *wc, int idx, uint32_t mask)
824 wc->masks.regs[idx] = mask;
827 /* Hashes 'flow' based on its L2 through L4 protocol information. */
829 flow_hash_symmetric_l4(const struct flow *flow, uint32_t basis)
834 struct in6_addr ipv6_addr;
839 uint8_t eth_addr[ETH_ADDR_LEN];
845 memset(&fields, 0, sizeof fields);
846 for (i = 0; i < ETH_ADDR_LEN; i++) {
847 fields.eth_addr[i] = flow->dl_src[i] ^ flow->dl_dst[i];
849 fields.vlan_tci = flow->vlan_tci & htons(VLAN_VID_MASK);
850 fields.eth_type = flow->dl_type;
852 /* UDP source and destination port are not taken into account because they
853 * will not necessarily be symmetric in a bidirectional flow. */
854 if (fields.eth_type == htons(ETH_TYPE_IP)) {
855 fields.ipv4_addr = flow->nw_src ^ flow->nw_dst;
856 fields.ip_proto = flow->nw_proto;
857 if (fields.ip_proto == IPPROTO_TCP || fields.ip_proto == IPPROTO_SCTP) {
858 fields.tp_port = flow->tp_src ^ flow->tp_dst;
860 } else if (fields.eth_type == htons(ETH_TYPE_IPV6)) {
861 const uint8_t *a = &flow->ipv6_src.s6_addr[0];
862 const uint8_t *b = &flow->ipv6_dst.s6_addr[0];
863 uint8_t *ipv6_addr = &fields.ipv6_addr.s6_addr[0];
865 for (i=0; i<16; i++) {
866 ipv6_addr[i] = a[i] ^ b[i];
868 fields.ip_proto = flow->nw_proto;
869 if (fields.ip_proto == IPPROTO_TCP || fields.ip_proto == IPPROTO_SCTP) {
870 fields.tp_port = flow->tp_src ^ flow->tp_dst;
873 return jhash_bytes(&fields, sizeof fields, basis);
876 /* Initialize a flow with random fields that matter for nx_hash_fields. */
878 flow_random_hash_fields(struct flow *flow)
880 uint16_t rnd = random_uint16();
882 /* Initialize to all zeros. */
883 memset(flow, 0, sizeof *flow);
885 eth_addr_random(flow->dl_src);
886 eth_addr_random(flow->dl_dst);
888 flow->vlan_tci = (OVS_FORCE ovs_be16) (random_uint16() & VLAN_VID_MASK);
890 /* Make most of the random flows IPv4, some IPv6, and rest random. */
891 flow->dl_type = rnd < 0x8000 ? htons(ETH_TYPE_IP) :
892 rnd < 0xc000 ? htons(ETH_TYPE_IPV6) : (OVS_FORCE ovs_be16)rnd;
894 if (dl_type_is_ip_any(flow->dl_type)) {
895 if (flow->dl_type == htons(ETH_TYPE_IP)) {
896 flow->nw_src = (OVS_FORCE ovs_be32)random_uint32();
897 flow->nw_dst = (OVS_FORCE ovs_be32)random_uint32();
899 random_bytes(&flow->ipv6_src, sizeof flow->ipv6_src);
900 random_bytes(&flow->ipv6_dst, sizeof flow->ipv6_dst);
902 /* Make most of IP flows TCP, some UDP or SCTP, and rest random. */
903 rnd = random_uint16();
904 flow->nw_proto = rnd < 0x8000 ? IPPROTO_TCP :
905 rnd < 0xc000 ? IPPROTO_UDP :
906 rnd < 0xd000 ? IPPROTO_SCTP : (uint8_t)rnd;
907 if (flow->nw_proto == IPPROTO_TCP ||
908 flow->nw_proto == IPPROTO_UDP ||
909 flow->nw_proto == IPPROTO_SCTP) {
910 flow->tp_src = (OVS_FORCE ovs_be16)random_uint16();
911 flow->tp_dst = (OVS_FORCE ovs_be16)random_uint16();
916 /* Masks the fields in 'wc' that are used by the flow hash 'fields'. */
918 flow_mask_hash_fields(const struct flow *flow, struct flow_wildcards *wc,
919 enum nx_hash_fields fields)
922 case NX_HASH_FIELDS_ETH_SRC:
923 memset(&wc->masks.dl_src, 0xff, sizeof wc->masks.dl_src);
926 case NX_HASH_FIELDS_SYMMETRIC_L4:
927 memset(&wc->masks.dl_src, 0xff, sizeof wc->masks.dl_src);
928 memset(&wc->masks.dl_dst, 0xff, sizeof wc->masks.dl_dst);
929 if (flow->dl_type == htons(ETH_TYPE_IP)) {
930 memset(&wc->masks.nw_src, 0xff, sizeof wc->masks.nw_src);
931 memset(&wc->masks.nw_dst, 0xff, sizeof wc->masks.nw_dst);
932 } else if (flow->dl_type == htons(ETH_TYPE_IPV6)) {
933 memset(&wc->masks.ipv6_src, 0xff, sizeof wc->masks.ipv6_src);
934 memset(&wc->masks.ipv6_dst, 0xff, sizeof wc->masks.ipv6_dst);
936 if (is_ip_any(flow)) {
937 memset(&wc->masks.nw_proto, 0xff, sizeof wc->masks.nw_proto);
938 flow_unwildcard_tp_ports(flow, wc);
940 wc->masks.vlan_tci |= htons(VLAN_VID_MASK | VLAN_CFI);
948 /* Hashes the portions of 'flow' designated by 'fields'. */
950 flow_hash_fields(const struct flow *flow, enum nx_hash_fields fields,
955 case NX_HASH_FIELDS_ETH_SRC:
956 return jhash_bytes(flow->dl_src, sizeof flow->dl_src, basis);
958 case NX_HASH_FIELDS_SYMMETRIC_L4:
959 return flow_hash_symmetric_l4(flow, basis);
965 /* Returns a string representation of 'fields'. */
967 flow_hash_fields_to_str(enum nx_hash_fields fields)
970 case NX_HASH_FIELDS_ETH_SRC: return "eth_src";
971 case NX_HASH_FIELDS_SYMMETRIC_L4: return "symmetric_l4";
972 default: return "<unknown>";
976 /* Returns true if the value of 'fields' is supported. Otherwise false. */
978 flow_hash_fields_valid(enum nx_hash_fields fields)
980 return fields == NX_HASH_FIELDS_ETH_SRC
981 || fields == NX_HASH_FIELDS_SYMMETRIC_L4;
984 /* Returns a hash value for the bits of 'flow' that are active based on
985 * 'wc', given 'basis'. */
987 flow_hash_in_wildcards(const struct flow *flow,
988 const struct flow_wildcards *wc, uint32_t basis)
990 const uint32_t *wc_u32 = (const uint32_t *) &wc->masks;
991 const uint32_t *flow_u32 = (const uint32_t *) flow;
996 for (i = 0; i < FLOW_U32S; i++) {
997 hash = mhash_add(hash, flow_u32[i] & wc_u32[i]);
999 return mhash_finish(hash, 4 * FLOW_U32S);
1002 /* Sets the VLAN VID that 'flow' matches to 'vid', which is interpreted as an
1003 * OpenFlow 1.0 "dl_vlan" value:
1005 * - If it is in the range 0...4095, 'flow->vlan_tci' is set to match
1006 * that VLAN. Any existing PCP match is unchanged (it becomes 0 if
1007 * 'flow' previously matched packets without a VLAN header).
1009 * - If it is OFP_VLAN_NONE, 'flow->vlan_tci' is set to match a packet
1010 * without a VLAN tag.
1012 * - Other values of 'vid' should not be used. */
1014 flow_set_dl_vlan(struct flow *flow, ovs_be16 vid)
1016 if (vid == htons(OFP10_VLAN_NONE)) {
1017 flow->vlan_tci = htons(0);
1019 vid &= htons(VLAN_VID_MASK);
1020 flow->vlan_tci &= ~htons(VLAN_VID_MASK);
1021 flow->vlan_tci |= htons(VLAN_CFI) | vid;
1025 /* Sets the VLAN VID that 'flow' matches to 'vid', which is interpreted as an
1026 * OpenFlow 1.2 "vlan_vid" value, that is, the low 13 bits of 'vlan_tci' (VID
1029 flow_set_vlan_vid(struct flow *flow, ovs_be16 vid)
1031 ovs_be16 mask = htons(VLAN_VID_MASK | VLAN_CFI);
1032 flow->vlan_tci &= ~mask;
1033 flow->vlan_tci |= vid & mask;
1036 /* Sets the VLAN PCP that 'flow' matches to 'pcp', which should be in the
1039 * This function has no effect on the VLAN ID that 'flow' matches.
1041 * After calling this function, 'flow' will not match packets without a VLAN
1044 flow_set_vlan_pcp(struct flow *flow, uint8_t pcp)
1047 flow->vlan_tci &= ~htons(VLAN_PCP_MASK);
1048 flow->vlan_tci |= htons((pcp << VLAN_PCP_SHIFT) | VLAN_CFI);
1051 /* Sets the MPLS Label that 'flow' matches to 'label', which is interpreted
1052 * as an OpenFlow 1.1 "mpls_label" value. */
1054 flow_set_mpls_label(struct flow *flow, ovs_be32 label)
1056 set_mpls_lse_label(&flow->mpls_lse, label);
1059 /* Sets the MPLS TTL that 'flow' matches to 'ttl', which should be in the
1062 flow_set_mpls_ttl(struct flow *flow, uint8_t ttl)
1064 set_mpls_lse_ttl(&flow->mpls_lse, ttl);
1067 /* Sets the MPLS TC that 'flow' matches to 'tc', which should be in the
1070 flow_set_mpls_tc(struct flow *flow, uint8_t tc)
1072 set_mpls_lse_tc(&flow->mpls_lse, tc);
1075 /* Sets the MPLS BOS bit that 'flow' matches to which should be 0 or 1. */
1077 flow_set_mpls_bos(struct flow *flow, uint8_t bos)
1079 set_mpls_lse_bos(&flow->mpls_lse, bos);
1084 flow_compose_l4(struct ofpbuf *b, const struct flow *flow)
1086 if (!(flow->nw_frag & FLOW_NW_FRAG_ANY)
1087 || !(flow->nw_frag & FLOW_NW_FRAG_LATER)) {
1088 if (flow->nw_proto == IPPROTO_TCP) {
1089 struct tcp_header *tcp;
1091 tcp = ofpbuf_put_zeros(b, sizeof *tcp);
1092 tcp->tcp_src = flow->tp_src;
1093 tcp->tcp_dst = flow->tp_dst;
1094 tcp->tcp_ctl = TCP_CTL(ntohs(flow->tcp_flags), 5);
1095 b->l7 = ofpbuf_tail(b);
1096 } else if (flow->nw_proto == IPPROTO_UDP) {
1097 struct udp_header *udp;
1099 udp = ofpbuf_put_zeros(b, sizeof *udp);
1100 udp->udp_src = flow->tp_src;
1101 udp->udp_dst = flow->tp_dst;
1102 b->l7 = ofpbuf_tail(b);
1103 } else if (flow->nw_proto == IPPROTO_SCTP) {
1104 struct sctp_header *sctp;
1106 sctp = ofpbuf_put_zeros(b, sizeof *sctp);
1107 sctp->sctp_src = flow->tp_src;
1108 sctp->sctp_dst = flow->tp_dst;
1109 b->l7 = ofpbuf_tail(b);
1110 } else if (flow->nw_proto == IPPROTO_ICMP) {
1111 struct icmp_header *icmp;
1113 icmp = ofpbuf_put_zeros(b, sizeof *icmp);
1114 icmp->icmp_type = ntohs(flow->tp_src);
1115 icmp->icmp_code = ntohs(flow->tp_dst);
1116 icmp->icmp_csum = csum(icmp, ICMP_HEADER_LEN);
1117 b->l7 = ofpbuf_tail(b);
1118 } else if (flow->nw_proto == IPPROTO_ICMPV6) {
1119 struct icmp6_hdr *icmp;
1121 icmp = ofpbuf_put_zeros(b, sizeof *icmp);
1122 icmp->icmp6_type = ntohs(flow->tp_src);
1123 icmp->icmp6_code = ntohs(flow->tp_dst);
1125 if (icmp->icmp6_code == 0 &&
1126 (icmp->icmp6_type == ND_NEIGHBOR_SOLICIT ||
1127 icmp->icmp6_type == ND_NEIGHBOR_ADVERT)) {
1128 struct in6_addr *nd_target;
1129 struct nd_opt_hdr *nd_opt;
1131 nd_target = ofpbuf_put_zeros(b, sizeof *nd_target);
1132 *nd_target = flow->nd_target;
1134 if (!eth_addr_is_zero(flow->arp_sha)) {
1135 nd_opt = ofpbuf_put_zeros(b, 8);
1136 nd_opt->nd_opt_len = 1;
1137 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
1138 memcpy(nd_opt + 1, flow->arp_sha, ETH_ADDR_LEN);
1140 if (!eth_addr_is_zero(flow->arp_tha)) {
1141 nd_opt = ofpbuf_put_zeros(b, 8);
1142 nd_opt->nd_opt_len = 1;
1143 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
1144 memcpy(nd_opt + 1, flow->arp_tha, ETH_ADDR_LEN);
1147 icmp->icmp6_cksum = (OVS_FORCE uint16_t)
1148 csum(icmp, (char *)ofpbuf_tail(b) - (char *)icmp);
1149 b->l7 = ofpbuf_tail(b);
1154 /* Puts into 'b' a packet that flow_extract() would parse as having the given
1157 * (This is useful only for testing, obviously, and the packet isn't really
1158 * valid. It hasn't got some checksums filled in, for one, and lots of fields
1159 * are just zeroed.) */
1161 flow_compose(struct ofpbuf *b, const struct flow *flow)
1163 /* eth_compose() sets l3 pointer and makes sure it is 32-bit aligned. */
1164 eth_compose(b, flow->dl_dst, flow->dl_src, ntohs(flow->dl_type), 0);
1165 if (flow->dl_type == htons(FLOW_DL_TYPE_NONE)) {
1166 struct eth_header *eth = b->l2;
1167 eth->eth_type = htons(b->size);
1171 if (flow->vlan_tci & htons(VLAN_CFI)) {
1172 eth_push_vlan(b, flow->vlan_tci);
1175 if (flow->dl_type == htons(ETH_TYPE_IP)) {
1176 struct ip_header *ip;
1178 ip = ofpbuf_put_zeros(b, sizeof *ip);
1179 ip->ip_ihl_ver = IP_IHL_VER(5, 4);
1180 ip->ip_tos = flow->nw_tos;
1181 ip->ip_ttl = flow->nw_ttl;
1182 ip->ip_proto = flow->nw_proto;
1183 put_16aligned_be32(&ip->ip_src, flow->nw_src);
1184 put_16aligned_be32(&ip->ip_dst, flow->nw_dst);
1186 if (flow->nw_frag & FLOW_NW_FRAG_ANY) {
1187 ip->ip_frag_off |= htons(IP_MORE_FRAGMENTS);
1188 if (flow->nw_frag & FLOW_NW_FRAG_LATER) {
1189 ip->ip_frag_off |= htons(100);
1193 b->l4 = ofpbuf_tail(b);
1195 flow_compose_l4(b, flow);
1197 ip->ip_tot_len = htons((uint8_t *) b->data + b->size
1198 - (uint8_t *) b->l3);
1199 ip->ip_csum = csum(ip, sizeof *ip);
1200 } else if (flow->dl_type == htons(ETH_TYPE_IPV6)) {
1201 struct ovs_16aligned_ip6_hdr *nh;
1203 nh = ofpbuf_put_zeros(b, sizeof *nh);
1204 put_16aligned_be32(&nh->ip6_flow, htonl(6 << 28) |
1205 htonl(flow->nw_tos << 20) | flow->ipv6_label);
1206 nh->ip6_hlim = flow->nw_ttl;
1207 nh->ip6_nxt = flow->nw_proto;
1209 memcpy(&nh->ip6_src, &flow->ipv6_src, sizeof(nh->ip6_src));
1210 memcpy(&nh->ip6_dst, &flow->ipv6_dst, sizeof(nh->ip6_dst));
1212 b->l4 = ofpbuf_tail(b);
1214 flow_compose_l4(b, flow);
1217 b->l7 ? htons((uint8_t *) b->l7 - (uint8_t *) b->l4) : htons(0);
1218 } else if (flow->dl_type == htons(ETH_TYPE_ARP) ||
1219 flow->dl_type == htons(ETH_TYPE_RARP)) {
1220 struct arp_eth_header *arp;
1222 b->l3 = arp = ofpbuf_put_zeros(b, sizeof *arp);
1223 arp->ar_hrd = htons(1);
1224 arp->ar_pro = htons(ETH_TYPE_IP);
1225 arp->ar_hln = ETH_ADDR_LEN;
1227 arp->ar_op = htons(flow->nw_proto);
1229 if (flow->nw_proto == ARP_OP_REQUEST ||
1230 flow->nw_proto == ARP_OP_REPLY) {
1231 put_16aligned_be32(&arp->ar_spa, flow->nw_src);
1232 put_16aligned_be32(&arp->ar_tpa, flow->nw_dst);
1233 memcpy(arp->ar_sha, flow->arp_sha, ETH_ADDR_LEN);
1234 memcpy(arp->ar_tha, flow->arp_tha, ETH_ADDR_LEN);
1238 if (eth_type_mpls(flow->dl_type)) {
1240 push_mpls(b, flow->dl_type, flow->mpls_lse);
1244 /* Compressed flow. */
1247 miniflow_n_values(const struct miniflow *flow)
1249 return count_1bits(flow->map);
1253 miniflow_alloc_values(struct miniflow *flow, int n)
1255 if (n <= MINI_N_INLINE) {
1256 return flow->inline_values;
1258 COVERAGE_INC(miniflow_malloc);
1259 return xmalloc(n * sizeof *flow->values);
1263 /* Completes an initialization of 'dst' as a miniflow copy of 'src' begun by
1264 * the caller. The caller must have already initialized 'dst->map' properly
1265 * to indicate the significant uint32_t elements of 'src'. 'n' must be the
1266 * number of 1-bits in 'dst->map'.
1268 * Normally the significant elements are the ones that are non-zero. However,
1269 * when a miniflow is initialized from a (mini)mask, the values can be zeroes,
1270 * so that the flow and mask always have the same maps.
1272 * This function initializes 'dst->values' (either inline if possible or with
1273 * malloc() otherwise) and copies the uint32_t elements of 'src' indicated by
1274 * 'dst->map' into it. */
1276 miniflow_init__(struct miniflow *dst, const struct flow *src, int n)
1278 const uint32_t *src_u32 = (const uint32_t *) src;
1282 dst->values = miniflow_alloc_values(dst, n);
1284 for (map = dst->map; map; map = zero_rightmost_1bit(map)) {
1285 dst->values[ofs++] = src_u32[raw_ctz(map)];
1289 /* Initializes 'dst' as a copy of 'src'. The caller must eventually free 'dst'
1290 * with miniflow_destroy(). */
1292 miniflow_init(struct miniflow *dst, const struct flow *src)
1294 const uint32_t *src_u32 = (const uint32_t *) src;
1298 /* Initialize dst->map, counting the number of nonzero elements. */
1302 for (i = 0; i < FLOW_U32S; i++) {
1304 dst->map |= UINT64_C(1) << i;
1309 miniflow_init__(dst, src, n);
1312 /* Initializes 'dst' as a copy of 'src', using 'mask->map' as 'dst''s map. The
1313 * caller must eventually free 'dst' with miniflow_destroy(). */
1315 miniflow_init_with_minimask(struct miniflow *dst, const struct flow *src,
1316 const struct minimask *mask)
1318 dst->map = mask->masks.map;
1319 miniflow_init__(dst, src, miniflow_n_values(dst));
1322 /* Initializes 'dst' as a copy of 'src'. The caller must eventually free 'dst'
1323 * with miniflow_destroy(). */
1325 miniflow_clone(struct miniflow *dst, const struct miniflow *src)
1327 int n = miniflow_n_values(src);
1328 dst->map = src->map;
1329 dst->values = miniflow_alloc_values(dst, n);
1330 memcpy(dst->values, src->values, n * sizeof *dst->values);
1333 /* Initializes 'dst' with the data in 'src', destroying 'src'.
1334 * The caller must eventually free 'dst' with miniflow_destroy(). */
1336 miniflow_move(struct miniflow *dst, struct miniflow *src)
1338 if (src->values == src->inline_values) {
1339 dst->values = dst->inline_values;
1340 memcpy(dst->values, src->values,
1341 miniflow_n_values(src) * sizeof *dst->values);
1343 dst->values = src->values;
1345 dst->map = src->map;
1348 /* Frees any memory owned by 'flow'. Does not free the storage in which 'flow'
1349 * itself resides; the caller is responsible for that. */
1351 miniflow_destroy(struct miniflow *flow)
1353 if (flow->values != flow->inline_values) {
1358 /* Initializes 'dst' as a copy of 'src'. */
1360 miniflow_expand(const struct miniflow *src, struct flow *dst)
1362 memset(dst, 0, sizeof *dst);
1363 flow_union_with_miniflow(dst, src);
1366 static const uint32_t *
1367 miniflow_get__(const struct miniflow *flow, unsigned int u32_ofs)
1369 if (!(flow->map & (UINT64_C(1) << u32_ofs))) {
1370 static const uint32_t zero = 0;
1373 return flow->values +
1374 count_1bits(flow->map & ((UINT64_C(1) << u32_ofs) - 1));
1377 /* Returns the uint32_t that would be at byte offset '4 * u32_ofs' if 'flow'
1378 * were expanded into a "struct flow". */
1380 miniflow_get(const struct miniflow *flow, unsigned int u32_ofs)
1382 return *miniflow_get__(flow, u32_ofs);
1385 /* Returns the ovs_be16 that would be at byte offset 'u8_ofs' if 'flow' were
1386 * expanded into a "struct flow". */
1388 miniflow_get_be16(const struct miniflow *flow, unsigned int u8_ofs)
1390 const uint32_t *u32p = miniflow_get__(flow, u8_ofs / 4);
1391 const ovs_be16 *be16p = (const ovs_be16 *) u32p;
1392 return be16p[u8_ofs % 4 != 0];
1395 /* Returns the VID within the vlan_tci member of the "struct flow" represented
1398 miniflow_get_vid(const struct miniflow *flow)
1400 ovs_be16 tci = miniflow_get_be16(flow, offsetof(struct flow, vlan_tci));
1401 return vlan_tci_to_vid(tci);
1404 /* Returns true if 'a' and 'b' are the same flow, false otherwise. */
1406 miniflow_equal(const struct miniflow *a, const struct miniflow *b)
1408 const uint32_t *ap = a->values;
1409 const uint32_t *bp = b->values;
1410 const uint64_t a_map = a->map;
1411 const uint64_t b_map = b->map;
1414 if (a_map == b_map) {
1415 for (map = a_map; map; map = zero_rightmost_1bit(map)) {
1416 if (*ap++ != *bp++) {
1421 for (map = a_map | b_map; map; map = zero_rightmost_1bit(map)) {
1422 uint64_t bit = rightmost_1bit(map);
1423 uint64_t a_value = a_map & bit ? *ap++ : 0;
1424 uint64_t b_value = b_map & bit ? *bp++ : 0;
1426 if (a_value != b_value) {
1435 /* Returns true if 'a' and 'b' are equal at the places where there are 1-bits
1436 * in 'mask', false if they differ. */
1438 miniflow_equal_in_minimask(const struct miniflow *a, const struct miniflow *b,
1439 const struct minimask *mask)
1444 p = mask->masks.values;
1446 for (map = mask->masks.map; map; map = zero_rightmost_1bit(map)) {
1447 int ofs = raw_ctz(map);
1449 if ((miniflow_get(a, ofs) ^ miniflow_get(b, ofs)) & *p) {
1458 /* Returns true if 'a' and 'b' are equal at the places where there are 1-bits
1459 * in 'mask', false if they differ. */
1461 miniflow_equal_flow_in_minimask(const struct miniflow *a, const struct flow *b,
1462 const struct minimask *mask)
1464 const uint32_t *b_u32 = (const uint32_t *) b;
1468 p = mask->masks.values;
1470 for (map = mask->masks.map; map; map = zero_rightmost_1bit(map)) {
1471 int ofs = raw_ctz(map);
1473 if ((miniflow_get(a, ofs) ^ b_u32[ofs]) & *p) {
1482 /* Returns a hash value for 'flow', given 'basis'. */
1484 miniflow_hash(const struct miniflow *flow, uint32_t basis)
1486 const uint32_t *p = flow->values;
1487 uint32_t hash = basis;
1488 uint64_t hash_map = 0;
1491 for (map = flow->map; map; map = zero_rightmost_1bit(map)) {
1493 hash = mhash_add(hash, *p);
1494 hash_map |= rightmost_1bit(map);
1498 hash = mhash_add(hash, hash_map);
1499 hash = mhash_add(hash, hash_map >> 32);
1501 return mhash_finish(hash, p - flow->values);
1504 /* Returns a hash value for the bits of 'flow' where there are 1-bits in
1505 * 'mask', given 'basis'.
1507 * The hash values returned by this function are the same as those returned by
1508 * flow_hash_in_minimask(), only the form of the arguments differ. */
1510 miniflow_hash_in_minimask(const struct miniflow *flow,
1511 const struct minimask *mask, uint32_t basis)
1513 const uint32_t *p = mask->masks.values;
1519 for (map = mask->masks.map; map; map = zero_rightmost_1bit(map)) {
1520 hash = mhash_add(hash, miniflow_get(flow, raw_ctz(map)) & *p++);
1523 return mhash_finish(hash, (p - mask->masks.values) * 4);
1526 /* Returns a hash value for the bits of 'flow' where there are 1-bits in
1527 * 'mask', given 'basis'.
1529 * The hash values returned by this function are the same as those returned by
1530 * miniflow_hash_in_minimask(), only the form of the arguments differ. */
1532 flow_hash_in_minimask(const struct flow *flow, const struct minimask *mask,
1535 const uint32_t *flow_u32 = (const uint32_t *)flow;
1536 const uint32_t *p = mask->masks.values;
1541 for (map = mask->masks.map; map; map = zero_rightmost_1bit(map)) {
1542 hash = mhash_add(hash, flow_u32[raw_ctz(map)] & *p++);
1545 return mhash_finish(hash, (p - mask->masks.values) * 4);
1548 /* Returns a hash value for the bits of range [start, end) in 'flow',
1549 * where there are 1-bits in 'mask', given 'hash'.
1551 * The hash values returned by this function are the same as those returned by
1552 * minimatch_hash_range(), only the form of the arguments differ. */
1554 flow_hash_in_minimask_range(const struct flow *flow,
1555 const struct minimask *mask,
1556 uint8_t start, uint8_t end, uint32_t *basis)
1558 const uint32_t *flow_u32 = (const uint32_t *)flow;
1559 unsigned int offset;
1560 uint64_t map = miniflow_get_map_in_range(&mask->masks, start, end,
1562 const uint32_t *p = mask->masks.values + offset;
1563 uint32_t hash = *basis;
1565 for (; map; map = zero_rightmost_1bit(map)) {
1566 hash = mhash_add(hash, flow_u32[raw_ctz(map)] & *p++);
1569 *basis = hash; /* Allow continuation from the unfinished value. */
1570 return mhash_finish(hash, (p - mask->masks.values) * 4);
1574 /* Initializes 'dst' as a copy of 'src'. The caller must eventually free 'dst'
1575 * with minimask_destroy(). */
1577 minimask_init(struct minimask *mask, const struct flow_wildcards *wc)
1579 miniflow_init(&mask->masks, &wc->masks);
1582 /* Initializes 'dst' as a copy of 'src'. The caller must eventually free 'dst'
1583 * with minimask_destroy(). */
1585 minimask_clone(struct minimask *dst, const struct minimask *src)
1587 miniflow_clone(&dst->masks, &src->masks);
1590 /* Initializes 'dst' with the data in 'src', destroying 'src'.
1591 * The caller must eventually free 'dst' with minimask_destroy(). */
1593 minimask_move(struct minimask *dst, struct minimask *src)
1595 miniflow_move(&dst->masks, &src->masks);
1598 /* Initializes 'dst_' as the bit-wise "and" of 'a_' and 'b_'.
1600 * The caller must provide room for FLOW_U32S "uint32_t"s in 'storage', for use
1601 * by 'dst_'. The caller must *not* free 'dst_' with minimask_destroy(). */
1603 minimask_combine(struct minimask *dst_,
1604 const struct minimask *a_, const struct minimask *b_,
1605 uint32_t storage[FLOW_U32S])
1607 struct miniflow *dst = &dst_->masks;
1608 const struct miniflow *a = &a_->masks;
1609 const struct miniflow *b = &b_->masks;
1613 dst->values = storage;
1616 for (map = a->map & b->map; map; map = zero_rightmost_1bit(map)) {
1617 int ofs = raw_ctz(map);
1618 uint32_t mask = miniflow_get(a, ofs) & miniflow_get(b, ofs);
1621 dst->map |= rightmost_1bit(map);
1622 dst->values[n++] = mask;
1627 /* Frees any memory owned by 'mask'. Does not free the storage in which 'mask'
1628 * itself resides; the caller is responsible for that. */
1630 minimask_destroy(struct minimask *mask)
1632 miniflow_destroy(&mask->masks);
1635 /* Initializes 'dst' as a copy of 'src'. */
1637 minimask_expand(const struct minimask *mask, struct flow_wildcards *wc)
1639 miniflow_expand(&mask->masks, &wc->masks);
1642 /* Returns the uint32_t that would be at byte offset '4 * u32_ofs' if 'mask'
1643 * were expanded into a "struct flow_wildcards". */
1645 minimask_get(const struct minimask *mask, unsigned int u32_ofs)
1647 return miniflow_get(&mask->masks, u32_ofs);
1650 /* Returns the VID mask within the vlan_tci member of the "struct
1651 * flow_wildcards" represented by 'mask'. */
1653 minimask_get_vid_mask(const struct minimask *mask)
1655 return miniflow_get_vid(&mask->masks);
1658 /* Returns true if 'a' and 'b' are the same flow mask, false otherwise. */
1660 minimask_equal(const struct minimask *a, const struct minimask *b)
1662 return miniflow_equal(&a->masks, &b->masks);
1665 /* Returns a hash value for 'mask', given 'basis'. */
1667 minimask_hash(const struct minimask *mask, uint32_t basis)
1669 return miniflow_hash(&mask->masks, basis);
1672 /* Returns true if at least one bit is wildcarded in 'a_' but not in 'b_',
1673 * false otherwise. */
1675 minimask_has_extra(const struct minimask *a_, const struct minimask *b_)
1677 const struct miniflow *a = &a_->masks;
1678 const struct miniflow *b = &b_->masks;
1681 for (map = a->map | b->map; map; map = zero_rightmost_1bit(map)) {
1682 int ofs = raw_ctz(map);
1683 uint32_t a_u32 = miniflow_get(a, ofs);
1684 uint32_t b_u32 = miniflow_get(b, ofs);
1686 if ((a_u32 & b_u32) != b_u32) {
1694 /* Returns true if 'mask' matches every packet, false if 'mask' fixes any bits
1697 minimask_is_catchall(const struct minimask *mask_)
1699 const struct miniflow *mask = &mask_->masks;
1700 const uint32_t *p = mask->values;
1703 for (map = mask->map; map; map = zero_rightmost_1bit(map)) {