2 * Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
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>
21 #include <netinet/in.h>
22 #include <netinet/icmp6.h>
23 #include <netinet/ip6.h>
26 #include "byte-order.h"
29 #include "dynamic-string.h"
32 #include "openflow/openflow.h"
33 #include "openvswitch/datapath-protocol.h"
35 #include "unaligned.h"
38 VLOG_DEFINE_THIS_MODULE(flow);
40 COVERAGE_DEFINE(flow_extract);
42 static struct arp_eth_header *
43 pull_arp(struct ofpbuf *packet)
45 return ofpbuf_try_pull(packet, ARP_ETH_HEADER_LEN);
48 static struct ip_header *
49 pull_ip(struct ofpbuf *packet)
51 if (packet->size >= IP_HEADER_LEN) {
52 struct ip_header *ip = packet->data;
53 int ip_len = IP_IHL(ip->ip_ihl_ver) * 4;
54 if (ip_len >= IP_HEADER_LEN && packet->size >= ip_len) {
55 return ofpbuf_pull(packet, ip_len);
61 static struct tcp_header *
62 pull_tcp(struct ofpbuf *packet)
64 if (packet->size >= TCP_HEADER_LEN) {
65 struct tcp_header *tcp = packet->data;
66 int tcp_len = TCP_OFFSET(tcp->tcp_ctl) * 4;
67 if (tcp_len >= TCP_HEADER_LEN && packet->size >= tcp_len) {
68 return ofpbuf_pull(packet, tcp_len);
74 static struct udp_header *
75 pull_udp(struct ofpbuf *packet)
77 return ofpbuf_try_pull(packet, UDP_HEADER_LEN);
80 static struct icmp_header *
81 pull_icmp(struct ofpbuf *packet)
83 return ofpbuf_try_pull(packet, ICMP_HEADER_LEN);
86 static struct icmp6_hdr *
87 pull_icmpv6(struct ofpbuf *packet)
89 return ofpbuf_try_pull(packet, sizeof(struct icmp6_hdr));
93 parse_vlan(struct ofpbuf *b, struct flow *flow)
96 ovs_be16 eth_type; /* ETH_TYPE_VLAN */
100 if (b->size >= sizeof(struct qtag_prefix) + sizeof(ovs_be16)) {
101 struct qtag_prefix *qp = ofpbuf_pull(b, sizeof *qp);
102 flow->vlan_tci = qp->tci | htons(VLAN_CFI);
107 parse_ethertype(struct ofpbuf *b)
109 struct llc_snap_header *llc;
112 proto = *(ovs_be16 *) ofpbuf_pull(b, sizeof proto);
113 if (ntohs(proto) >= ETH_TYPE_MIN) {
117 if (b->size < sizeof *llc) {
118 return htons(FLOW_DL_TYPE_NONE);
122 if (llc->llc.llc_dsap != LLC_DSAP_SNAP
123 || llc->llc.llc_ssap != LLC_SSAP_SNAP
124 || llc->llc.llc_cntl != LLC_CNTL_SNAP
125 || memcmp(llc->snap.snap_org, SNAP_ORG_ETHERNET,
126 sizeof llc->snap.snap_org)) {
127 return htons(FLOW_DL_TYPE_NONE);
130 ofpbuf_pull(b, sizeof *llc);
131 return llc->snap.snap_type;
135 parse_ipv6(struct ofpbuf *packet, struct flow *flow)
138 int nh_len = sizeof(struct ip6_hdr);
142 if (packet->size < sizeof *nh) {
147 nexthdr = nh->ip6_nxt;
149 flow->ipv6_src = nh->ip6_src;
150 flow->ipv6_dst = nh->ip6_dst;
152 tc_flow = get_unaligned_be32(&nh->ip6_flow);
153 flow->nw_tos = (ntohl(tc_flow) >> 4) & IP_DSCP_MASK;
154 flow->nw_proto = IPPROTO_NONE;
157 if ((nexthdr != IPPROTO_HOPOPTS)
158 && (nexthdr != IPPROTO_ROUTING)
159 && (nexthdr != IPPROTO_DSTOPTS)
160 && (nexthdr != IPPROTO_AH)
161 && (nexthdr != IPPROTO_FRAGMENT)) {
162 /* It's either a terminal header (e.g., TCP, UDP) or one we
163 * don't understand. In either case, we're done with the
164 * packet, so use it to fill in 'nw_proto'. */
168 /* We only verify that at least 8 bytes of the next header are
169 * available, but many of these headers are longer. Ensure that
170 * accesses within the extension header are within those first 8
172 if (packet->size < nh_len + 8) {
176 if ((nexthdr == IPPROTO_HOPOPTS)
177 || (nexthdr == IPPROTO_ROUTING)
178 || (nexthdr == IPPROTO_DSTOPTS)) {
179 /* These headers, while different, have the fields we care about
180 * in the same location and with the same interpretation. */
181 struct ip6_ext *ext_hdr;
183 ext_hdr = (struct ip6_ext *)((char *)packet->data + nh_len);
184 nexthdr = ext_hdr->ip6e_nxt;
185 nh_len += (ext_hdr->ip6e_len + 1) * 8;
186 } else if (nexthdr == IPPROTO_AH) {
187 /* A standard AH definition isn't available, but the fields
188 * we care about are in the same location as the generic
189 * option header--only the header length is calculated
191 struct ip6_ext *ext_hdr;
193 ext_hdr = (struct ip6_ext *)((char *)packet->data + nh_len);
194 nexthdr = ext_hdr->ip6e_nxt;
195 nh_len += (ext_hdr->ip6e_len + 2) * 4;
196 } else if (nexthdr == IPPROTO_FRAGMENT) {
197 struct ip6_frag *frag_hdr;
199 frag_hdr = (struct ip6_frag *)((char *)packet->data + nh_len);
201 nexthdr = frag_hdr->ip6f_nxt;
202 nh_len += sizeof *frag_hdr;
204 /* We only process the first fragment. */
205 if ((frag_hdr->ip6f_offlg & IP6F_OFF_MASK) != htons(0)) {
206 nexthdr = IPPROTO_FRAGMENT;
212 flow->nw_proto = nexthdr;
216 /* Neighbor Discovery Solicitation and Advertisement messages are
217 * identical in structure, so we'll just use one of them. To be safe,
218 * we'll assert that they're still identical. */
219 BUILD_ASSERT_DECL(sizeof(struct nd_neighbor_solicit)
220 == sizeof(struct nd_neighbor_advert));
223 parse_icmpv6(struct ofpbuf *b, struct flow *flow, int icmp_len)
225 const struct icmp6_hdr *icmp = pull_icmpv6(b);
231 /* The ICMPv6 type and code fields use the 16-bit transport port
232 * fields, so we need to store them in 16-bit network byte order. */
233 flow->icmp_type = htons(icmp->icmp6_type);
234 flow->icmp_code = htons(icmp->icmp6_code);
236 if (!icmp->icmp6_code
237 && ((icmp->icmp6_type == ND_NEIGHBOR_SOLICIT)
238 || (icmp->icmp6_type == ND_NEIGHBOR_ADVERT))) {
239 struct nd_neighbor_solicit *nd_ns; /* Identical to ND advert */
241 /* In order to process neighbor discovery options, we need the
243 if ((icmp_len < sizeof *nd_ns)
244 || (!ofpbuf_try_pull(b, sizeof *nd_ns - sizeof *icmp))) {
247 nd_ns = (struct nd_neighbor_solicit *)icmp;
248 flow->nd_target = nd_ns->nd_ns_target;
250 icmp_len -= sizeof(*nd_ns);
251 while (icmp_len >= 8) {
252 struct nd_opt_hdr *nd_opt;
256 /* The minimum size of an option is 8 bytes, which also is
257 * the size of Ethernet link-layer options. */
258 nd_opt = ofpbuf_pull(b, 8);
259 if (!nd_opt->nd_opt_len || nd_opt->nd_opt_len * 8 > icmp_len) {
262 opt_len = nd_opt->nd_opt_len * 8;
263 data = (const uint8_t *)(nd_opt + 1);
265 /* Store the link layer address if the appropriate option is
266 * provided. It is considered an error if the same link
267 * layer option is specified twice. */
268 if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LINKADDR
270 if (eth_addr_is_zero(flow->arp_sha)) {
271 memcpy(flow->arp_sha, data, ETH_ADDR_LEN);
275 } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LINKADDR
277 if (eth_addr_is_zero(flow->arp_tha)) {
278 memcpy(flow->arp_tha, data, ETH_ADDR_LEN);
284 /* Pull the rest of this option. */
285 if (!ofpbuf_try_pull(b, opt_len - 8)) {
296 memset(&flow->nd_target, '\0', sizeof(flow->nd_target));
297 memset(flow->arp_sha, '\0', sizeof(flow->arp_sha));
298 memset(flow->arp_tha, '\0', sizeof(flow->arp_tha));
304 /* Initializes 'flow' members from 'packet', 'tun_id', and 'in_port.
305 * Initializes 'packet' header pointers as follows:
307 * - packet->l2 to the start of the Ethernet header.
309 * - packet->l3 to just past the Ethernet header, or just past the
310 * vlan_header if one is present, to the first byte of the payload of the
313 * - packet->l4 to just past the IPv4 header, if one is present and has a
314 * correct length, and otherwise NULL.
316 * - packet->l7 to just past the TCP or UDP or ICMP header, if one is
317 * present and has a correct length, and otherwise NULL.
320 flow_extract(struct ofpbuf *packet, ovs_be64 tun_id, uint16_t in_port,
323 struct ofpbuf b = *packet;
324 struct eth_header *eth;
327 COVERAGE_INC(flow_extract);
329 memset(flow, 0, sizeof *flow);
330 flow->tun_id = tun_id;
331 flow->in_port = in_port;
338 if (b.size < sizeof *eth) {
344 memcpy(flow->dl_src, eth->eth_src, ETH_ADDR_LEN);
345 memcpy(flow->dl_dst, eth->eth_dst, ETH_ADDR_LEN);
347 /* dl_type, vlan_tci. */
348 ofpbuf_pull(&b, ETH_ADDR_LEN * 2);
349 if (eth->eth_type == htons(ETH_TYPE_VLAN)) {
350 parse_vlan(&b, flow);
352 flow->dl_type = parse_ethertype(&b);
356 if (flow->dl_type == htons(ETH_TYPE_IP)) {
357 const struct ip_header *nh = pull_ip(&b);
359 flow->nw_src = get_unaligned_be32(&nh->ip_src);
360 flow->nw_dst = get_unaligned_be32(&nh->ip_dst);
361 flow->nw_tos = nh->ip_tos & IP_DSCP_MASK;
362 flow->nw_proto = nh->ip_proto;
364 if (!IP_IS_FRAGMENT(nh->ip_frag_off)) {
365 if (flow->nw_proto == IPPROTO_TCP) {
366 const struct tcp_header *tcp = pull_tcp(&b);
368 flow->tp_src = tcp->tcp_src;
369 flow->tp_dst = tcp->tcp_dst;
372 } else if (flow->nw_proto == IPPROTO_UDP) {
373 const struct udp_header *udp = pull_udp(&b);
375 flow->tp_src = udp->udp_src;
376 flow->tp_dst = udp->udp_dst;
379 } else if (flow->nw_proto == IPPROTO_ICMP) {
380 const struct icmp_header *icmp = pull_icmp(&b);
382 flow->icmp_type = htons(icmp->icmp_type);
383 flow->icmp_code = htons(icmp->icmp_code);
391 } else if (flow->dl_type == htons(ETH_TYPE_IPV6)) {
393 const struct ip6_hdr *nh;
395 nh_len = parse_ipv6(&b, flow);
400 nh = ofpbuf_try_pull(&b, nh_len);
403 if (flow->nw_proto == IPPROTO_TCP) {
404 const struct tcp_header *tcp = pull_tcp(&b);
406 flow->tp_src = tcp->tcp_src;
407 flow->tp_dst = tcp->tcp_dst;
410 } else if (flow->nw_proto == IPPROTO_UDP) {
411 const struct udp_header *udp = pull_udp(&b);
413 flow->tp_src = udp->udp_src;
414 flow->tp_dst = udp->udp_dst;
417 } else if (flow->nw_proto == IPPROTO_ICMPV6) {
418 if (parse_icmpv6(&b, flow, b.size)) {
423 } else if (flow->dl_type == htons(ETH_TYPE_ARP)) {
424 const struct arp_eth_header *arp = pull_arp(&b);
425 if (arp && arp->ar_hrd == htons(1)
426 && arp->ar_pro == htons(ETH_TYPE_IP)
427 && arp->ar_hln == ETH_ADDR_LEN
428 && arp->ar_pln == 4) {
429 /* We only match on the lower 8 bits of the opcode. */
430 if (ntohs(arp->ar_op) <= 0xff) {
431 flow->nw_proto = ntohs(arp->ar_op);
434 if ((flow->nw_proto == ARP_OP_REQUEST)
435 || (flow->nw_proto == ARP_OP_REPLY)) {
436 flow->nw_src = arp->ar_spa;
437 flow->nw_dst = arp->ar_tpa;
438 memcpy(flow->arp_sha, arp->ar_sha, ETH_ADDR_LEN);
439 memcpy(flow->arp_tha, arp->ar_tha, ETH_ADDR_LEN);
447 /* Extracts the flow stats for a packet. The 'flow' and 'packet'
448 * arguments must have been initialized through a call to flow_extract().
451 flow_extract_stats(const struct flow *flow, struct ofpbuf *packet,
452 struct dpif_flow_stats *stats)
454 memset(stats, 0, sizeof(*stats));
456 if ((flow->dl_type == htons(ETH_TYPE_IP)) && packet->l4) {
457 if ((flow->nw_proto == IPPROTO_TCP) && packet->l7) {
458 struct tcp_header *tcp = packet->l4;
459 stats->tcp_flags = TCP_FLAGS(tcp->tcp_ctl);
463 stats->n_bytes = packet->size;
464 stats->n_packets = 1;
468 flow_to_string(const struct flow *flow)
470 struct ds ds = DS_EMPTY_INITIALIZER;
471 flow_format(&ds, flow);
476 flow_format(struct ds *ds, const struct flow *flow)
478 ds_put_format(ds, "tunnel%#"PRIx64":in_port%04"PRIx16":tci(",
479 flow->tun_id, flow->in_port);
480 if (flow->vlan_tci) {
481 ds_put_format(ds, "vlan%"PRIu16",pcp%d",
482 vlan_tci_to_vid(flow->vlan_tci),
483 vlan_tci_to_pcp(flow->vlan_tci));
485 ds_put_char(ds, '0');
487 ds_put_format(ds, ") mac"ETH_ADDR_FMT"->"ETH_ADDR_FMT
489 ETH_ADDR_ARGS(flow->dl_src),
490 ETH_ADDR_ARGS(flow->dl_dst),
491 ntohs(flow->dl_type));
493 if (flow->dl_type == htons(ETH_TYPE_IPV6)) {
494 ds_put_format(ds, " proto%"PRIu8" tos%"PRIu8" ipv6",
495 flow->nw_proto, flow->nw_tos);
496 print_ipv6_addr(ds, &flow->ipv6_src);
497 ds_put_cstr(ds, "->");
498 print_ipv6_addr(ds, &flow->ipv6_dst);
501 ds_put_format(ds, " proto%"PRIu8
503 " ip"IP_FMT"->"IP_FMT,
506 IP_ARGS(&flow->nw_src),
507 IP_ARGS(&flow->nw_dst));
509 if (flow->tp_src || flow->tp_dst) {
510 ds_put_format(ds, " port%"PRIu16"->%"PRIu16,
511 ntohs(flow->tp_src), ntohs(flow->tp_dst));
513 if (!eth_addr_is_zero(flow->arp_sha) || !eth_addr_is_zero(flow->arp_tha)) {
514 ds_put_format(ds, " arp_ha"ETH_ADDR_FMT"->"ETH_ADDR_FMT,
515 ETH_ADDR_ARGS(flow->arp_sha),
516 ETH_ADDR_ARGS(flow->arp_tha));
521 flow_print(FILE *stream, const struct flow *flow)
523 char *s = flow_to_string(flow);
528 /* flow_wildcards functions. */
530 /* Initializes 'wc' as a set of wildcards that matches every packet. */
532 flow_wildcards_init_catchall(struct flow_wildcards *wc)
534 wc->wildcards = FWW_ALL;
535 wc->tun_id_mask = htonll(0);
536 wc->nw_src_mask = htonl(0);
537 wc->nw_dst_mask = htonl(0);
538 wc->ipv6_src_mask = in6addr_any;
539 wc->ipv6_dst_mask = in6addr_any;
540 memset(wc->reg_masks, 0, sizeof wc->reg_masks);
541 wc->vlan_tci_mask = htons(0);
545 /* Initializes 'wc' as an exact-match set of wildcards; that is, 'wc' does not
546 * wildcard any bits or fields. */
548 flow_wildcards_init_exact(struct flow_wildcards *wc)
551 wc->tun_id_mask = htonll(UINT64_MAX);
552 wc->nw_src_mask = htonl(UINT32_MAX);
553 wc->nw_dst_mask = htonl(UINT32_MAX);
554 wc->ipv6_src_mask = in6addr_exact;
555 wc->ipv6_dst_mask = in6addr_exact;
556 memset(wc->reg_masks, 0xff, sizeof wc->reg_masks);
557 wc->vlan_tci_mask = htons(UINT16_MAX);
561 /* Returns true if 'wc' is exact-match, false if 'wc' wildcards any bits or
564 flow_wildcards_is_exact(const struct flow_wildcards *wc)
569 || wc->tun_id_mask != htonll(UINT64_MAX)
570 || wc->nw_src_mask != htonl(UINT32_MAX)
571 || wc->nw_dst_mask != htonl(UINT32_MAX)
572 || wc->vlan_tci_mask != htons(UINT16_MAX)
573 || !ipv6_mask_is_exact(&wc->ipv6_src_mask)
574 || !ipv6_mask_is_exact(&wc->ipv6_dst_mask)) {
578 for (i = 0; i < FLOW_N_REGS; i++) {
579 if (wc->reg_masks[i] != htonl(UINT32_MAX)) {
587 /* Initializes 'dst' as the combination of wildcards in 'src1' and 'src2'.
588 * That is, a bit or a field is wildcarded in 'dst' if it is wildcarded in
589 * 'src1' or 'src2' or both. */
591 flow_wildcards_combine(struct flow_wildcards *dst,
592 const struct flow_wildcards *src1,
593 const struct flow_wildcards *src2)
597 dst->wildcards = src1->wildcards | src2->wildcards;
598 dst->tun_id_mask = src1->tun_id_mask & src2->tun_id_mask;
599 dst->nw_src_mask = src1->nw_src_mask & src2->nw_src_mask;
600 dst->nw_dst_mask = src1->nw_dst_mask & src2->nw_dst_mask;
601 dst->ipv6_src_mask = ipv6_addr_bitand(&src1->ipv6_src_mask,
602 &src2->ipv6_src_mask);
603 dst->ipv6_dst_mask = ipv6_addr_bitand(&src1->ipv6_dst_mask,
604 &src2->ipv6_dst_mask);
605 for (i = 0; i < FLOW_N_REGS; i++) {
606 dst->reg_masks[i] = src1->reg_masks[i] & src2->reg_masks[i];
608 dst->vlan_tci_mask = src1->vlan_tci_mask & src2->vlan_tci_mask;
611 /* Returns a hash of the wildcards in 'wc'. */
613 flow_wildcards_hash(const struct flow_wildcards *wc)
615 /* If you change struct flow_wildcards and thereby trigger this
616 * assertion, please check that the new struct flow_wildcards has no holes
617 * in it before you update the assertion. */
618 BUILD_ASSERT_DECL(sizeof *wc == 56 + FLOW_N_REGS * 4);
619 return hash_bytes(wc, sizeof *wc, 0);
622 /* Returns true if 'a' and 'b' represent the same wildcards, false if they are
625 flow_wildcards_equal(const struct flow_wildcards *a,
626 const struct flow_wildcards *b)
630 if (a->wildcards != b->wildcards
631 || a->tun_id_mask != b->tun_id_mask
632 || a->nw_src_mask != b->nw_src_mask
633 || a->nw_dst_mask != b->nw_dst_mask
634 || a->vlan_tci_mask != b->vlan_tci_mask
635 || !ipv6_addr_equals(&a->ipv6_src_mask, &b->ipv6_src_mask)
636 || !ipv6_addr_equals(&a->ipv6_dst_mask, &b->ipv6_dst_mask)) {
640 for (i = 0; i < FLOW_N_REGS; i++) {
641 if (a->reg_masks[i] != b->reg_masks[i]) {
649 /* Returns true if at least one bit or field is wildcarded in 'a' but not in
650 * 'b', false otherwise. */
652 flow_wildcards_has_extra(const struct flow_wildcards *a,
653 const struct flow_wildcards *b)
656 struct in6_addr ipv6_masked;
658 for (i = 0; i < FLOW_N_REGS; i++) {
659 if ((a->reg_masks[i] & b->reg_masks[i]) != b->reg_masks[i]) {
664 ipv6_masked = ipv6_addr_bitand(&a->ipv6_src_mask, &b->ipv6_src_mask);
665 if (!ipv6_addr_equals(&ipv6_masked, &b->ipv6_src_mask)) {
669 ipv6_masked = ipv6_addr_bitand(&a->ipv6_dst_mask, &b->ipv6_dst_mask);
670 if (!ipv6_addr_equals(&ipv6_masked, &b->ipv6_dst_mask)) {
674 return (a->wildcards & ~b->wildcards
675 || (a->tun_id_mask & b->tun_id_mask) != b->tun_id_mask
676 || (a->nw_src_mask & b->nw_src_mask) != b->nw_src_mask
677 || (a->nw_dst_mask & b->nw_dst_mask) != b->nw_dst_mask
678 || (a->vlan_tci_mask & b->vlan_tci_mask) != b->vlan_tci_mask);
682 set_nw_mask(ovs_be32 *maskp, ovs_be32 mask)
684 if (ip_is_cidr(mask)) {
692 /* Sets the IP (or ARP) source wildcard mask to CIDR 'mask' (consisting of N
693 * high-order 1-bit and 32-N low-order 0-bits). Returns true if successful,
694 * false if 'mask' is not a CIDR mask. */
696 flow_wildcards_set_nw_src_mask(struct flow_wildcards *wc, ovs_be32 mask)
698 return set_nw_mask(&wc->nw_src_mask, mask);
701 /* Sets the IP (or ARP) destination wildcard mask to CIDR 'mask' (consisting of
702 * N high-order 1-bit and 32-N low-order 0-bits). Returns true if successful,
703 * false if 'mask' is not a CIDR mask. */
705 flow_wildcards_set_nw_dst_mask(struct flow_wildcards *wc, ovs_be32 mask)
707 return set_nw_mask(&wc->nw_dst_mask, mask);
711 set_ipv6_mask(struct in6_addr *maskp, const struct in6_addr *mask)
713 if (ipv6_is_cidr(mask)) {
721 /* Sets the IPv6 source wildcard mask to CIDR 'mask' (consisting of N
722 * high-order 1-bit and 128-N low-order 0-bits). Returns true if successful,
723 * false if 'mask' is not a CIDR mask. */
725 flow_wildcards_set_ipv6_src_mask(struct flow_wildcards *wc,
726 const struct in6_addr *mask)
728 return set_ipv6_mask(&wc->ipv6_src_mask, mask);
731 /* Sets the IPv6 destination wildcard mask to CIDR 'mask' (consisting of
732 * N high-order 1-bit and 128-N low-order 0-bits). Returns true if
733 * successful, false if 'mask' is not a CIDR mask. */
735 flow_wildcards_set_ipv6_dst_mask(struct flow_wildcards *wc,
736 const struct in6_addr *mask)
738 return set_ipv6_mask(&wc->ipv6_dst_mask, mask);
741 /* Sets the wildcard mask for register 'idx' in 'wc' to 'mask'.
742 * (A 0-bit indicates a wildcard bit.) */
744 flow_wildcards_set_reg_mask(struct flow_wildcards *wc, int idx, uint32_t mask)
746 wc->reg_masks[idx] = mask;
749 /* Hashes 'flow' based on its L2 through L4 protocol information. */
751 flow_hash_symmetric_l4(const struct flow *flow, uint32_t basis)
756 struct in6_addr ipv6_addr;
761 uint8_t eth_addr[ETH_ADDR_LEN];
767 memset(&fields, 0, sizeof fields);
768 for (i = 0; i < ETH_ADDR_LEN; i++) {
769 fields.eth_addr[i] = flow->dl_src[i] ^ flow->dl_dst[i];
771 fields.vlan_tci = flow->vlan_tci & htons(VLAN_VID_MASK);
772 fields.eth_type = flow->dl_type;
773 if (fields.eth_type == htons(ETH_TYPE_IP)) {
774 fields.ipv4_addr = flow->nw_src ^ flow->nw_dst;
775 fields.ip_proto = flow->nw_proto;
776 if (fields.ip_proto == IPPROTO_TCP || fields.ip_proto == IPPROTO_UDP) {
777 fields.tp_addr = flow->tp_src ^ flow->tp_dst;
779 } else if (fields.eth_type == htons(ETH_TYPE_IPV6)) {
780 const uint8_t *a = &flow->ipv6_src.s6_addr[0];
781 const uint8_t *b = &flow->ipv6_dst.s6_addr[0];
782 uint8_t *ipv6_addr = &fields.ipv6_addr.s6_addr[0];
784 for (i=0; i<16; i++) {
785 ipv6_addr[i] = a[i] ^ b[i];
787 fields.ip_proto = flow->nw_proto;
788 if (fields.ip_proto == IPPROTO_TCP || fields.ip_proto == IPPROTO_UDP) {
789 fields.tp_addr = flow->tp_src ^ flow->tp_dst;
792 return hash_bytes(&fields, sizeof fields, basis);