/*
- * Copyright (c) 2008, 2009, 2010 Nicira Networks.
+ * Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
#include <config.h>
#include <sys/types.h>
#include "flow.h"
+#include <assert.h>
+#include <errno.h>
#include <inttypes.h>
+#include <limits.h>
#include <netinet/in.h>
+#include <netinet/icmp6.h>
+#include <netinet/ip6.h>
+#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "byte-order.h"
#include "coverage.h"
+#include "csum.h"
#include "dynamic-string.h"
#include "hash.h"
-#include "ofp-util.h"
+#include "match.h"
#include "ofpbuf.h"
#include "openflow/openflow.h"
-#include "openvswitch/datapath-protocol.h"
#include "packets.h"
#include "unaligned.h"
#include "vlog.h"
VLOG_DEFINE_THIS_MODULE(flow);
COVERAGE_DEFINE(flow_extract);
+COVERAGE_DEFINE(miniflow_malloc);
static struct arp_eth_header *
pull_arp(struct ofpbuf *packet)
return ofpbuf_try_pull(packet, ICMP_HEADER_LEN);
}
+static struct icmp6_hdr *
+pull_icmpv6(struct ofpbuf *packet)
+{
+ return ofpbuf_try_pull(packet, sizeof(struct icmp6_hdr));
+}
+
static void
parse_vlan(struct ofpbuf *b, struct flow *flow)
{
ovs_be16 proto;
proto = *(ovs_be16 *) ofpbuf_pull(b, sizeof proto);
- if (ntohs(proto) >= ODP_DL_TYPE_ETH2_CUTOFF) {
+ if (ntohs(proto) >= ETH_TYPE_MIN) {
return proto;
}
if (b->size < sizeof *llc) {
- return htons(ODP_DL_TYPE_NOT_ETH_TYPE);
+ return htons(FLOW_DL_TYPE_NONE);
}
llc = b->data;
|| llc->llc.llc_cntl != LLC_CNTL_SNAP
|| memcmp(llc->snap.snap_org, SNAP_ORG_ETHERNET,
sizeof llc->snap.snap_org)) {
- return htons(ODP_DL_TYPE_NOT_ETH_TYPE);
+ return htons(FLOW_DL_TYPE_NONE);
}
ofpbuf_pull(b, sizeof *llc);
return llc->snap.snap_type;
}
-/* Initializes 'flow' members from 'packet', 'tun_id', and 'in_port.
+static int
+parse_ipv6(struct ofpbuf *packet, struct flow *flow)
+{
+ const struct ip6_hdr *nh;
+ ovs_be32 tc_flow;
+ int nexthdr;
+
+ nh = ofpbuf_try_pull(packet, sizeof *nh);
+ if (!nh) {
+ return EINVAL;
+ }
+
+ nexthdr = nh->ip6_nxt;
+
+ flow->ipv6_src = nh->ip6_src;
+ flow->ipv6_dst = nh->ip6_dst;
+
+ tc_flow = get_unaligned_be32(&nh->ip6_flow);
+ flow->nw_tos = ntohl(tc_flow) >> 20;
+ flow->ipv6_label = tc_flow & htonl(IPV6_LABEL_MASK);
+ flow->nw_ttl = nh->ip6_hlim;
+ flow->nw_proto = IPPROTO_NONE;
+
+ while (1) {
+ if ((nexthdr != IPPROTO_HOPOPTS)
+ && (nexthdr != IPPROTO_ROUTING)
+ && (nexthdr != IPPROTO_DSTOPTS)
+ && (nexthdr != IPPROTO_AH)
+ && (nexthdr != IPPROTO_FRAGMENT)) {
+ /* It's either a terminal header (e.g., TCP, UDP) or one we
+ * don't understand. In either case, we're done with the
+ * packet, so use it to fill in 'nw_proto'. */
+ break;
+ }
+
+ /* We only verify that at least 8 bytes of the next header are
+ * available, but many of these headers are longer. Ensure that
+ * accesses within the extension header are within those first 8
+ * bytes. All extension headers are required to be at least 8
+ * bytes. */
+ if (packet->size < 8) {
+ return EINVAL;
+ }
+
+ if ((nexthdr == IPPROTO_HOPOPTS)
+ || (nexthdr == IPPROTO_ROUTING)
+ || (nexthdr == IPPROTO_DSTOPTS)) {
+ /* These headers, while different, have the fields we care about
+ * in the same location and with the same interpretation. */
+ const struct ip6_ext *ext_hdr = packet->data;
+ nexthdr = ext_hdr->ip6e_nxt;
+ if (!ofpbuf_try_pull(packet, (ext_hdr->ip6e_len + 1) * 8)) {
+ return EINVAL;
+ }
+ } else if (nexthdr == IPPROTO_AH) {
+ /* A standard AH definition isn't available, but the fields
+ * we care about are in the same location as the generic
+ * option header--only the header length is calculated
+ * differently. */
+ const struct ip6_ext *ext_hdr = packet->data;
+ nexthdr = ext_hdr->ip6e_nxt;
+ if (!ofpbuf_try_pull(packet, (ext_hdr->ip6e_len + 2) * 4)) {
+ return EINVAL;
+ }
+ } else if (nexthdr == IPPROTO_FRAGMENT) {
+ const struct ip6_frag *frag_hdr = packet->data;
+
+ nexthdr = frag_hdr->ip6f_nxt;
+ if (!ofpbuf_try_pull(packet, sizeof *frag_hdr)) {
+ return EINVAL;
+ }
+
+ /* We only process the first fragment. */
+ if (frag_hdr->ip6f_offlg != htons(0)) {
+ if ((frag_hdr->ip6f_offlg & IP6F_OFF_MASK) == htons(0)) {
+ flow->nw_frag = FLOW_NW_FRAG_ANY;
+ } else {
+ flow->nw_frag |= FLOW_NW_FRAG_LATER;
+ nexthdr = IPPROTO_FRAGMENT;
+ break;
+ }
+ }
+ }
+ }
+
+ flow->nw_proto = nexthdr;
+ return 0;
+}
+
+static void
+parse_tcp(struct ofpbuf *packet, struct ofpbuf *b, struct flow *flow)
+{
+ const struct tcp_header *tcp = pull_tcp(b);
+ if (tcp) {
+ flow->tp_src = tcp->tcp_src;
+ flow->tp_dst = tcp->tcp_dst;
+ packet->l7 = b->data;
+ }
+}
+
+static void
+parse_udp(struct ofpbuf *packet, struct ofpbuf *b, struct flow *flow)
+{
+ const struct udp_header *udp = pull_udp(b);
+ if (udp) {
+ flow->tp_src = udp->udp_src;
+ flow->tp_dst = udp->udp_dst;
+ packet->l7 = b->data;
+ }
+}
+
+static bool
+parse_icmpv6(struct ofpbuf *b, struct flow *flow)
+{
+ const struct icmp6_hdr *icmp = pull_icmpv6(b);
+
+ if (!icmp) {
+ return false;
+ }
+
+ /* The ICMPv6 type and code fields use the 16-bit transport port
+ * fields, so we need to store them in 16-bit network byte order. */
+ flow->tp_src = htons(icmp->icmp6_type);
+ flow->tp_dst = htons(icmp->icmp6_code);
+
+ if (icmp->icmp6_code == 0 &&
+ (icmp->icmp6_type == ND_NEIGHBOR_SOLICIT ||
+ icmp->icmp6_type == ND_NEIGHBOR_ADVERT)) {
+ const struct in6_addr *nd_target;
+
+ nd_target = ofpbuf_try_pull(b, sizeof *nd_target);
+ if (!nd_target) {
+ return false;
+ }
+ flow->nd_target = *nd_target;
+
+ while (b->size >= 8) {
+ /* The minimum size of an option is 8 bytes, which also is
+ * the size of Ethernet link-layer options. */
+ const struct nd_opt_hdr *nd_opt = b->data;
+ int opt_len = nd_opt->nd_opt_len * 8;
+
+ if (!opt_len || opt_len > b->size) {
+ goto invalid;
+ }
+
+ /* Store the link layer address if the appropriate option is
+ * provided. It is considered an error if the same link
+ * layer option is specified twice. */
+ if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LINKADDR
+ && opt_len == 8) {
+ if (eth_addr_is_zero(flow->arp_sha)) {
+ memcpy(flow->arp_sha, nd_opt + 1, ETH_ADDR_LEN);
+ } else {
+ goto invalid;
+ }
+ } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LINKADDR
+ && opt_len == 8) {
+ if (eth_addr_is_zero(flow->arp_tha)) {
+ memcpy(flow->arp_tha, nd_opt + 1, ETH_ADDR_LEN);
+ } else {
+ goto invalid;
+ }
+ }
+
+ if (!ofpbuf_try_pull(b, opt_len)) {
+ goto invalid;
+ }
+ }
+ }
+
+ return true;
+
+invalid:
+ memset(&flow->nd_target, 0, sizeof(flow->nd_target));
+ memset(flow->arp_sha, 0, sizeof(flow->arp_sha));
+ memset(flow->arp_tha, 0, sizeof(flow->arp_tha));
+
+ return false;
+
+}
+
+/* Initializes 'flow' members from 'packet', 'skb_priority', 'tnl', and
+ * 'ofp_in_port'.
+ *
* Initializes 'packet' header pointers as follows:
*
* - packet->l2 to the start of the Ethernet header.
* - packet->l7 to just past the TCP or UDP or ICMP header, if one is
* present and has a correct length, and otherwise NULL.
*/
-int
-flow_extract(struct ofpbuf *packet, ovs_be32 tun_id, uint16_t in_port,
+void
+flow_extract(struct ofpbuf *packet, uint32_t skb_priority, uint32_t skb_mark,
+ const struct flow_tnl *tnl, uint16_t ofp_in_port,
struct flow *flow)
{
struct ofpbuf b = *packet;
struct eth_header *eth;
- int retval = 0;
COVERAGE_INC(flow_extract);
memset(flow, 0, sizeof *flow);
- flow->tun_id = tun_id;
- flow->in_port = in_port;
+
+ if (tnl) {
+ assert(tnl != &flow->tunnel);
+ flow->tunnel = *tnl;
+ }
+ flow->in_port = ofp_in_port;
+ flow->skb_priority = skb_priority;
+ flow->skb_mark = skb_mark;
packet->l2 = b.data;
packet->l3 = NULL;
packet->l7 = NULL;
if (b.size < sizeof *eth) {
- return 0;
+ return;
}
/* Link layer. */
if (flow->dl_type == htons(ETH_TYPE_IP)) {
const struct ip_header *nh = pull_ip(&b);
if (nh) {
+ packet->l4 = b.data;
+
flow->nw_src = get_unaligned_be32(&nh->ip_src);
flow->nw_dst = get_unaligned_be32(&nh->ip_dst);
- flow->nw_tos = nh->ip_tos & IP_DSCP_MASK;
flow->nw_proto = nh->ip_proto;
- packet->l4 = b.data;
- if (!IP_IS_FRAGMENT(nh->ip_frag_off)) {
- if (flow->nw_proto == IP_TYPE_TCP) {
- const struct tcp_header *tcp = pull_tcp(&b);
- if (tcp) {
- flow->tp_src = tcp->tcp_src;
- flow->tp_dst = tcp->tcp_dst;
- packet->l7 = b.data;
- }
- } else if (flow->nw_proto == IP_TYPE_UDP) {
- const struct udp_header *udp = pull_udp(&b);
- if (udp) {
- flow->tp_src = udp->udp_src;
- flow->tp_dst = udp->udp_dst;
- packet->l7 = b.data;
- }
- } else if (flow->nw_proto == IP_TYPE_ICMP) {
+
+ flow->nw_tos = nh->ip_tos;
+ if (IP_IS_FRAGMENT(nh->ip_frag_off)) {
+ flow->nw_frag = FLOW_NW_FRAG_ANY;
+ if (nh->ip_frag_off & htons(IP_FRAG_OFF_MASK)) {
+ flow->nw_frag |= FLOW_NW_FRAG_LATER;
+ }
+ }
+ flow->nw_ttl = nh->ip_ttl;
+
+ if (!(nh->ip_frag_off & htons(IP_FRAG_OFF_MASK))) {
+ if (flow->nw_proto == IPPROTO_TCP) {
+ parse_tcp(packet, &b, flow);
+ } else if (flow->nw_proto == IPPROTO_UDP) {
+ parse_udp(packet, &b, flow);
+ } else if (flow->nw_proto == IPPROTO_ICMP) {
const struct icmp_header *icmp = pull_icmp(&b);
if (icmp) {
- flow->icmp_type = htons(icmp->icmp_type);
- flow->icmp_code = htons(icmp->icmp_code);
+ flow->tp_src = htons(icmp->icmp_type);
+ flow->tp_dst = htons(icmp->icmp_code);
packet->l7 = b.data;
}
}
- } else {
- retval = 1;
}
}
- } else if (flow->dl_type == htons(ETH_TYPE_ARP)) {
+ } else if (flow->dl_type == htons(ETH_TYPE_IPV6)) {
+ if (parse_ipv6(&b, flow)) {
+ return;
+ }
+
+ packet->l4 = b.data;
+ if (flow->nw_proto == IPPROTO_TCP) {
+ parse_tcp(packet, &b, flow);
+ } else if (flow->nw_proto == IPPROTO_UDP) {
+ parse_udp(packet, &b, flow);
+ } else if (flow->nw_proto == IPPROTO_ICMPV6) {
+ if (parse_icmpv6(&b, flow)) {
+ packet->l7 = b.data;
+ }
+ }
+ } else if (flow->dl_type == htons(ETH_TYPE_ARP) ||
+ flow->dl_type == htons(ETH_TYPE_RARP)) {
const struct arp_eth_header *arp = pull_arp(&b);
if (arp && arp->ar_hrd == htons(1)
&& arp->ar_pro == htons(ETH_TYPE_IP)
flow->nw_proto = ntohs(arp->ar_op);
}
- if ((flow->nw_proto == ARP_OP_REQUEST)
- || (flow->nw_proto == ARP_OP_REPLY)) {
- flow->nw_src = arp->ar_spa;
- flow->nw_dst = arp->ar_tpa;
- }
+ flow->nw_src = arp->ar_spa;
+ flow->nw_dst = arp->ar_tpa;
+ memcpy(flow->arp_sha, arp->ar_sha, ETH_ADDR_LEN);
+ memcpy(flow->arp_tha, arp->ar_tha, ETH_ADDR_LEN);
}
}
- return retval;
}
-/* Extracts the flow stats for a packet. The 'flow' and 'packet'
- * arguments must have been initialized through a call to flow_extract().
- */
+/* For every bit of a field that is wildcarded in 'wildcards', sets the
+ * corresponding bit in 'flow' to zero. */
void
-flow_extract_stats(const struct flow *flow, struct ofpbuf *packet,
- struct odp_flow_stats *stats)
+flow_zero_wildcards(struct flow *flow, const struct flow_wildcards *wildcards)
{
- memset(stats, '\0', sizeof(*stats));
+ uint32_t *flow_u32 = (uint32_t *) flow;
+ const uint32_t *wc_u32 = (const uint32_t *) &wildcards->masks;
+ size_t i;
- if ((flow->dl_type == htons(ETH_TYPE_IP)) && packet->l4) {
- if ((flow->nw_proto == IP_TYPE_TCP) && packet->l7) {
- struct tcp_header *tcp = packet->l4;
- stats->tcp_flags = TCP_FLAGS(tcp->tcp_ctl);
- }
+ for (i = 0; i < FLOW_U32S; i++) {
+ flow_u32[i] &= wc_u32[i];
}
+}
- stats->n_bytes = packet->size;
- stats->n_packets = 1;
+/* Initializes 'fmd' with the metadata found in 'flow'. */
+void
+flow_get_metadata(const struct flow *flow, struct flow_metadata *fmd)
+{
+ BUILD_ASSERT_DECL(FLOW_WC_SEQ == 18);
+
+ fmd->tun_id = flow->tunnel.tun_id;
+ fmd->metadata = flow->metadata;
+ memcpy(fmd->regs, flow->regs, sizeof fmd->regs);
+ fmd->in_port = flow->in_port;
}
char *
void
flow_format(struct ds *ds, const struct flow *flow)
{
- ds_put_format(ds, "tunnel%#"PRIx32":in_port%04"PRIx16":tci(",
- ntohl(flow->tun_id), flow->in_port);
- if (flow->vlan_tci) {
- ds_put_format(ds, "vlan%"PRIu16",pcp%d",
- vlan_tci_to_vid(flow->vlan_tci),
- vlan_tci_to_pcp(flow->vlan_tci));
- } else {
- ds_put_char(ds, '0');
- }
- ds_put_format(ds, ") mac"ETH_ADDR_FMT"->"ETH_ADDR_FMT
- " type%04"PRIx16
- " proto%"PRIu8
- " tos%"PRIu8
- " ip"IP_FMT"->"IP_FMT
- " port%"PRIu16"->%"PRIu16,
- ETH_ADDR_ARGS(flow->dl_src),
- ETH_ADDR_ARGS(flow->dl_dst),
- ntohs(flow->dl_type),
- flow->nw_proto,
- flow->nw_tos,
- IP_ARGS(&flow->nw_src),
- IP_ARGS(&flow->nw_dst),
- ntohs(flow->tp_src),
- ntohs(flow->tp_dst));
+ struct match match;
+
+ match_wc_init(&match, flow);
+ match_format(&match, ds, flow->skb_priority);
}
void
void
flow_wildcards_init_catchall(struct flow_wildcards *wc)
{
- wc->wildcards = FWW_ALL;
- wc->nw_src_mask = htonl(0);
- wc->nw_dst_mask = htonl(0);
- memset(wc->reg_masks, 0, sizeof wc->reg_masks);
- wc->vlan_tci_mask = htons(0);
+ memset(&wc->masks, 0, sizeof wc->masks);
}
/* Initializes 'wc' as an exact-match set of wildcards; that is, 'wc' does not
void
flow_wildcards_init_exact(struct flow_wildcards *wc)
{
- wc->wildcards = 0;
- wc->nw_src_mask = htonl(UINT32_MAX);
- wc->nw_dst_mask = htonl(UINT32_MAX);
- memset(wc->reg_masks, 0xff, sizeof wc->reg_masks);
- wc->vlan_tci_mask = htons(UINT16_MAX);
+ memset(&wc->masks, 0xff, sizeof wc->masks);
+ memset(wc->masks.zeros, 0, sizeof wc->masks.zeros);
}
-/* Returns true if 'wc' is exact-match, false if 'wc' wildcards any bits or
+/* Returns true if 'wc' matches every packet, false if 'wc' fixes any bits or
* fields. */
bool
-flow_wildcards_is_exact(const struct flow_wildcards *wc)
+flow_wildcards_is_catchall(const struct flow_wildcards *wc)
{
- int i;
-
- if (wc->wildcards
- || wc->nw_src_mask != htonl(UINT32_MAX)
- || wc->nw_dst_mask != htonl(UINT32_MAX)
- || wc->vlan_tci_mask != htons(UINT16_MAX)) {
- return false;
- }
+ const uint32_t *wc_u32 = (const uint32_t *) &wc->masks;
+ size_t i;
- for (i = 0; i < FLOW_N_REGS; i++) {
- if (wc->reg_masks[i] != htonl(UINT32_MAX)) {
+ for (i = 0; i < FLOW_U32S; i++) {
+ if (wc_u32[i]) {
return false;
}
}
-
return true;
}
const struct flow_wildcards *src1,
const struct flow_wildcards *src2)
{
- int i;
+ uint32_t *dst_u32 = (uint32_t *) &dst->masks;
+ const uint32_t *src1_u32 = (const uint32_t *) &src1->masks;
+ const uint32_t *src2_u32 = (const uint32_t *) &src2->masks;
+ size_t i;
- dst->wildcards = src1->wildcards | src2->wildcards;
- dst->nw_src_mask = src1->nw_src_mask & src2->nw_src_mask;
- dst->nw_dst_mask = src1->nw_dst_mask & src2->nw_dst_mask;
- for (i = 0; i < FLOW_N_REGS; i++) {
- dst->reg_masks[i] = src1->reg_masks[i] & src2->reg_masks[i];
+ for (i = 0; i < FLOW_U32S; i++) {
+ dst_u32[i] = src1_u32[i] & src2_u32[i];
}
- dst->vlan_tci_mask = src1->vlan_tci_mask & src2->vlan_tci_mask;
}
/* Returns a hash of the wildcards in 'wc'. */
uint32_t
-flow_wildcards_hash(const struct flow_wildcards *wc)
+flow_wildcards_hash(const struct flow_wildcards *wc, uint32_t basis)
{
- /* If you change struct flow_wildcards and thereby trigger this
- * assertion, please check that the new struct flow_wildcards has no holes
- * in it before you update the assertion. */
- BUILD_ASSERT_DECL(sizeof *wc == 16 + FLOW_N_REGS * 4);
- return hash_bytes(wc, sizeof *wc, 0);
+ return flow_hash(&wc->masks, basis);;
}
/* Returns true if 'a' and 'b' represent the same wildcards, false if they are
flow_wildcards_equal(const struct flow_wildcards *a,
const struct flow_wildcards *b)
{
+ return flow_equal(&a->masks, &b->masks);
+}
+
+/* Returns true if at least one bit or field is wildcarded in 'a' but not in
+ * 'b', false otherwise. */
+bool
+flow_wildcards_has_extra(const struct flow_wildcards *a,
+ const struct flow_wildcards *b)
+{
+ const uint32_t *a_u32 = (const uint32_t *) &a->masks;
+ const uint32_t *b_u32 = (const uint32_t *) &b->masks;
+ size_t i;
+
+ for (i = 0; i < FLOW_U32S; i++) {
+ if ((a_u32[i] & b_u32[i]) != b_u32[i]) {
+ return true;
+ }
+ }
+ return false;
+}
+
+/* Returns true if 'a' and 'b' are equal, except that 0-bits (wildcarded bits)
+ * in 'wc' do not need to be equal in 'a' and 'b'. */
+bool
+flow_equal_except(const struct flow *a, const struct flow *b,
+ const struct flow_wildcards *wc)
+{
+ const uint32_t *a_u32 = (const uint32_t *) a;
+ const uint32_t *b_u32 = (const uint32_t *) b;
+ const uint32_t *wc_u32 = (const uint32_t *) &wc->masks;
+ size_t i;
+
+ for (i = 0; i < FLOW_U32S; i++) {
+ if ((a_u32[i] ^ b_u32[i]) & wc_u32[i]) {
+ return false;
+ }
+ }
+ return true;
+}
+
+/* Sets the wildcard mask for register 'idx' in 'wc' to 'mask'.
+ * (A 0-bit indicates a wildcard bit.) */
+void
+flow_wildcards_set_reg_mask(struct flow_wildcards *wc, int idx, uint32_t mask)
+{
+ wc->masks.regs[idx] = mask;
+}
+
+/* Hashes 'flow' based on its L2 through L4 protocol information. */
+uint32_t
+flow_hash_symmetric_l4(const struct flow *flow, uint32_t basis)
+{
+ struct {
+ union {
+ ovs_be32 ipv4_addr;
+ struct in6_addr ipv6_addr;
+ };
+ ovs_be16 eth_type;
+ ovs_be16 vlan_tci;
+ ovs_be16 tp_port;
+ uint8_t eth_addr[ETH_ADDR_LEN];
+ uint8_t ip_proto;
+ } fields;
+
int i;
- if (a->wildcards != b->wildcards
- || a->nw_src_mask != b->nw_src_mask
- || a->nw_dst_mask != b->nw_dst_mask
- || a->vlan_tci_mask != b->vlan_tci_mask) {
- return false;
+ memset(&fields, 0, sizeof fields);
+ for (i = 0; i < ETH_ADDR_LEN; i++) {
+ fields.eth_addr[i] = flow->dl_src[i] ^ flow->dl_dst[i];
+ }
+ fields.vlan_tci = flow->vlan_tci & htons(VLAN_VID_MASK);
+ fields.eth_type = flow->dl_type;
+
+ /* UDP source and destination port are not taken into account because they
+ * will not necessarily be symmetric in a bidirectional flow. */
+ if (fields.eth_type == htons(ETH_TYPE_IP)) {
+ fields.ipv4_addr = flow->nw_src ^ flow->nw_dst;
+ fields.ip_proto = flow->nw_proto;
+ if (fields.ip_proto == IPPROTO_TCP) {
+ fields.tp_port = flow->tp_src ^ flow->tp_dst;
+ }
+ } else if (fields.eth_type == htons(ETH_TYPE_IPV6)) {
+ const uint8_t *a = &flow->ipv6_src.s6_addr[0];
+ const uint8_t *b = &flow->ipv6_dst.s6_addr[0];
+ uint8_t *ipv6_addr = &fields.ipv6_addr.s6_addr[0];
+
+ for (i=0; i<16; i++) {
+ ipv6_addr[i] = a[i] ^ b[i];
+ }
+ fields.ip_proto = flow->nw_proto;
+ if (fields.ip_proto == IPPROTO_TCP) {
+ fields.tp_port = flow->tp_src ^ flow->tp_dst;
+ }
+ }
+ return hash_bytes(&fields, sizeof fields, basis);
+}
+
+/* Hashes the portions of 'flow' designated by 'fields'. */
+uint32_t
+flow_hash_fields(const struct flow *flow, enum nx_hash_fields fields,
+ uint16_t basis)
+{
+ switch (fields) {
+
+ case NX_HASH_FIELDS_ETH_SRC:
+ return hash_bytes(flow->dl_src, sizeof flow->dl_src, basis);
+
+ case NX_HASH_FIELDS_SYMMETRIC_L4:
+ return flow_hash_symmetric_l4(flow, basis);
+ }
+
+ NOT_REACHED();
+}
+
+/* Returns a string representation of 'fields'. */
+const char *
+flow_hash_fields_to_str(enum nx_hash_fields fields)
+{
+ switch (fields) {
+ case NX_HASH_FIELDS_ETH_SRC: return "eth_src";
+ case NX_HASH_FIELDS_SYMMETRIC_L4: return "symmetric_l4";
+ default: return "<unknown>";
+ }
+}
+
+/* Returns true if the value of 'fields' is supported. Otherwise false. */
+bool
+flow_hash_fields_valid(enum nx_hash_fields fields)
+{
+ return fields == NX_HASH_FIELDS_ETH_SRC
+ || fields == NX_HASH_FIELDS_SYMMETRIC_L4;
+}
+
+/* Sets the VLAN VID that 'flow' matches to 'vid', which is interpreted as an
+ * OpenFlow 1.0 "dl_vlan" value:
+ *
+ * - If it is in the range 0...4095, 'flow->vlan_tci' is set to match
+ * that VLAN. Any existing PCP match is unchanged (it becomes 0 if
+ * 'flow' previously matched packets without a VLAN header).
+ *
+ * - If it is OFP_VLAN_NONE, 'flow->vlan_tci' is set to match a packet
+ * without a VLAN tag.
+ *
+ * - Other values of 'vid' should not be used. */
+void
+flow_set_dl_vlan(struct flow *flow, ovs_be16 vid)
+{
+ if (vid == htons(OFP10_VLAN_NONE)) {
+ flow->vlan_tci = htons(0);
+ } else {
+ vid &= htons(VLAN_VID_MASK);
+ flow->vlan_tci &= ~htons(VLAN_VID_MASK);
+ flow->vlan_tci |= htons(VLAN_CFI) | vid;
+ }
+}
+
+/* Sets the VLAN VID that 'flow' matches to 'vid', which is interpreted as an
+ * OpenFlow 1.2 "vlan_vid" value, that is, the low 13 bits of 'vlan_tci' (VID
+ * plus CFI). */
+void
+flow_set_vlan_vid(struct flow *flow, ovs_be16 vid)
+{
+ ovs_be16 mask = htons(VLAN_VID_MASK | VLAN_CFI);
+ flow->vlan_tci &= ~mask;
+ flow->vlan_tci |= vid & mask;
+}
+
+/* Sets the VLAN PCP that 'flow' matches to 'pcp', which should be in the
+ * range 0...7.
+ *
+ * This function has no effect on the VLAN ID that 'flow' matches.
+ *
+ * After calling this function, 'flow' will not match packets without a VLAN
+ * header. */
+void
+flow_set_vlan_pcp(struct flow *flow, uint8_t pcp)
+{
+ pcp &= 0x07;
+ flow->vlan_tci &= ~htons(VLAN_PCP_MASK);
+ flow->vlan_tci |= htons((pcp << VLAN_PCP_SHIFT) | VLAN_CFI);
+}
+
+/* Puts into 'b' a packet that flow_extract() would parse as having the given
+ * 'flow'.
+ *
+ * (This is useful only for testing, obviously, and the packet isn't really
+ * valid. It hasn't got some checksums filled in, for one, and lots of fields
+ * are just zeroed.) */
+void
+flow_compose(struct ofpbuf *b, const struct flow *flow)
+{
+ eth_compose(b, flow->dl_dst, flow->dl_src, ntohs(flow->dl_type), 0);
+ if (flow->dl_type == htons(FLOW_DL_TYPE_NONE)) {
+ struct eth_header *eth = b->l2;
+ eth->eth_type = htons(b->size);
+ return;
+ }
+
+ if (flow->vlan_tci & htons(VLAN_CFI)) {
+ eth_push_vlan(b, flow->vlan_tci);
}
- for (i = 0; i < FLOW_N_REGS; i++) {
- if (a->reg_masks[i] != b->reg_masks[i]) {
+ if (flow->dl_type == htons(ETH_TYPE_IP)) {
+ struct ip_header *ip;
+
+ b->l3 = ip = ofpbuf_put_zeros(b, sizeof *ip);
+ ip->ip_ihl_ver = IP_IHL_VER(5, 4);
+ ip->ip_tos = flow->nw_tos;
+ ip->ip_proto = flow->nw_proto;
+ ip->ip_src = flow->nw_src;
+ ip->ip_dst = flow->nw_dst;
+
+ if (flow->nw_frag & FLOW_NW_FRAG_ANY) {
+ ip->ip_frag_off |= htons(IP_MORE_FRAGMENTS);
+ if (flow->nw_frag & FLOW_NW_FRAG_LATER) {
+ ip->ip_frag_off |= htons(100);
+ }
+ }
+ if (!(flow->nw_frag & FLOW_NW_FRAG_ANY)
+ || !(flow->nw_frag & FLOW_NW_FRAG_LATER)) {
+ if (flow->nw_proto == IPPROTO_TCP) {
+ struct tcp_header *tcp;
+
+ b->l4 = tcp = ofpbuf_put_zeros(b, sizeof *tcp);
+ tcp->tcp_src = flow->tp_src;
+ tcp->tcp_dst = flow->tp_dst;
+ tcp->tcp_ctl = TCP_CTL(0, 5);
+ } else if (flow->nw_proto == IPPROTO_UDP) {
+ struct udp_header *udp;
+
+ b->l4 = udp = ofpbuf_put_zeros(b, sizeof *udp);
+ udp->udp_src = flow->tp_src;
+ udp->udp_dst = flow->tp_dst;
+ } else if (flow->nw_proto == IPPROTO_ICMP) {
+ struct icmp_header *icmp;
+
+ b->l4 = icmp = ofpbuf_put_zeros(b, sizeof *icmp);
+ icmp->icmp_type = ntohs(flow->tp_src);
+ icmp->icmp_code = ntohs(flow->tp_dst);
+ icmp->icmp_csum = csum(icmp, ICMP_HEADER_LEN);
+ }
+ }
+
+ ip = b->l3;
+ ip->ip_tot_len = htons((uint8_t *) b->data + b->size
+ - (uint8_t *) b->l3);
+ ip->ip_csum = csum(ip, sizeof *ip);
+ } else if (flow->dl_type == htons(ETH_TYPE_IPV6)) {
+ /* XXX */
+ } else if (flow->dl_type == htons(ETH_TYPE_ARP) ||
+ flow->dl_type == htons(ETH_TYPE_RARP)) {
+ struct arp_eth_header *arp;
+
+ b->l3 = arp = ofpbuf_put_zeros(b, sizeof *arp);
+ arp->ar_hrd = htons(1);
+ arp->ar_pro = htons(ETH_TYPE_IP);
+ arp->ar_hln = ETH_ADDR_LEN;
+ arp->ar_pln = 4;
+ arp->ar_op = htons(flow->nw_proto);
+
+ if (flow->nw_proto == ARP_OP_REQUEST ||
+ flow->nw_proto == ARP_OP_REPLY) {
+ arp->ar_spa = flow->nw_src;
+ arp->ar_tpa = flow->nw_dst;
+ memcpy(arp->ar_sha, flow->arp_sha, ETH_ADDR_LEN);
+ memcpy(arp->ar_tha, flow->arp_tha, ETH_ADDR_LEN);
+ }
+ }
+}
+\f
+/* Compressed flow. */
+
+static int
+miniflow_n_values(const struct miniflow *flow)
+{
+ int n, i;
+
+ n = 0;
+ for (i = 0; i < MINI_N_MAPS; i++) {
+ n += popcount(flow->map[i]);
+ }
+ return n;
+}
+
+static uint32_t *
+miniflow_alloc_values(struct miniflow *flow, int n)
+{
+ if (n <= MINI_N_INLINE) {
+ return flow->inline_values;
+ } else {
+ COVERAGE_INC(miniflow_malloc);
+ return xmalloc(n * sizeof *flow->values);
+ }
+}
+
+/* Initializes 'dst' as a copy of 'src'. The caller must eventually free 'dst'
+ * with miniflow_destroy(). */
+void
+miniflow_init(struct miniflow *dst, const struct flow *src)
+{
+ const uint32_t *src_u32 = (const uint32_t *) src;
+ unsigned int ofs;
+ unsigned int i;
+ int n;
+
+ /* Initialize dst->map, counting the number of nonzero elements. */
+ n = 0;
+ memset(dst->map, 0, sizeof dst->map);
+ for (i = 0; i < FLOW_U32S; i++) {
+ if (src_u32[i]) {
+ dst->map[i / 32] |= 1u << (i % 32);
+ n++;
+ }
+ }
+
+ /* Initialize dst->values. */
+ dst->values = miniflow_alloc_values(dst, n);
+ ofs = 0;
+ for (i = 0; i < MINI_N_MAPS; i++) {
+ uint32_t map;
+
+ for (map = dst->map[i]; map; map = zero_rightmost_1bit(map)) {
+ dst->values[ofs++] = src_u32[raw_ctz(map) + i * 32];
+ }
+ }
+}
+
+/* Initializes 'dst' as a copy of 'src'. The caller must eventually free 'dst'
+ * with miniflow_destroy(). */
+void
+miniflow_clone(struct miniflow *dst, const struct miniflow *src)
+{
+ int n = miniflow_n_values(src);
+ memcpy(dst->map, src->map, sizeof dst->map);
+ dst->values = miniflow_alloc_values(dst, n);
+ memcpy(dst->values, src->values, n * sizeof *dst->values);
+}
+
+/* Frees any memory owned by 'flow'. Does not free the storage in which 'flow'
+ * itself resides; the caller is responsible for that. */
+void
+miniflow_destroy(struct miniflow *flow)
+{
+ if (flow->values != flow->inline_values) {
+ free(flow->values);
+ }
+}
+
+/* Initializes 'dst' as a copy of 'src'. */
+void
+miniflow_expand(const struct miniflow *src, struct flow *dst)
+{
+ uint32_t *dst_u32 = (uint32_t *) dst;
+ int ofs;
+ int i;
+
+ memset(dst_u32, 0, sizeof *dst);
+
+ ofs = 0;
+ for (i = 0; i < MINI_N_MAPS; i++) {
+ uint32_t map;
+
+ for (map = src->map[i]; map; map = zero_rightmost_1bit(map)) {
+ dst_u32[raw_ctz(map) + i * 32] = src->values[ofs++];
+ }
+ }
+}
+
+static const uint32_t *
+miniflow_get__(const struct miniflow *flow, unsigned int u32_ofs)
+{
+ if (!(flow->map[u32_ofs / 32] & (1u << (u32_ofs % 32)))) {
+ static const uint32_t zero = 0;
+ return &zero;
+ } else {
+ const uint32_t *p = flow->values;
+
+ BUILD_ASSERT(MINI_N_MAPS == 2);
+ if (u32_ofs < 32) {
+ p += popcount(flow->map[0] & ((1u << u32_ofs) - 1));
+ } else {
+ p += popcount(flow->map[0]);
+ p += popcount(flow->map[1] & ((1u << (u32_ofs - 32)) - 1));
+ }
+ return p;
+ }
+}
+
+/* Returns the uint32_t that would be at byte offset '4 * u32_ofs' if 'flow'
+ * were expanded into a "struct flow". */
+uint32_t
+miniflow_get(const struct miniflow *flow, unsigned int u32_ofs)
+{
+ return *miniflow_get__(flow, u32_ofs);
+}
+
+/* Returns the ovs_be16 that would be at byte offset 'u8_ofs' if 'flow' were
+ * expanded into a "struct flow". */
+static ovs_be16
+miniflow_get_be16(const struct miniflow *flow, unsigned int u8_ofs)
+{
+ const uint32_t *u32p = miniflow_get__(flow, u8_ofs / 4);
+ const ovs_be16 *be16p = (const ovs_be16 *) u32p;
+ return be16p[u8_ofs % 4 != 0];
+}
+
+/* Returns the VID within the vlan_tci member of the "struct flow" represented
+ * by 'flow'. */
+uint16_t
+miniflow_get_vid(const struct miniflow *flow)
+{
+ ovs_be16 tci = miniflow_get_be16(flow, offsetof(struct flow, vlan_tci));
+ return vlan_tci_to_vid(tci);
+}
+
+/* Returns true if 'a' and 'b' are the same flow, false otherwise. */
+bool
+miniflow_equal(const struct miniflow *a, const struct miniflow *b)
+{
+ int i;
+
+ for (i = 0; i < MINI_N_MAPS; i++) {
+ if (a->map[i] != b->map[i]) {
return false;
}
}
+ return !memcmp(a->values, b->values,
+ miniflow_n_values(a) * sizeof *a->values);
+}
+
+/* Returns true if 'a' and 'b' are equal at the places where there are 1-bits
+ * in 'mask', false if they differ. */
+bool
+miniflow_equal_in_minimask(const struct miniflow *a, const struct miniflow *b,
+ const struct minimask *mask)
+{
+ const uint32_t *p;
+ int i;
+
+ p = mask->masks.values;
+ for (i = 0; i < MINI_N_MAPS; i++) {
+ uint32_t map;
+
+ for (map = mask->masks.map[i]; map; map = zero_rightmost_1bit(map)) {
+ int ofs = raw_ctz(map) + i * 32;
+
+ if ((miniflow_get(a, ofs) ^ miniflow_get(b, ofs)) & *p) {
+ return false;
+ }
+ p++;
+ }
+ }
+
return true;
}
-/* Returns true if at least one bit or field is wildcarded in 'a' but not in
- * 'b', false otherwise. */
+/* Returns true if 'a' and 'b' are equal at the places where there are 1-bits
+ * in 'mask', false if they differ. */
bool
-flow_wildcards_has_extra(const struct flow_wildcards *a,
- const struct flow_wildcards *b)
+miniflow_equal_flow_in_minimask(const struct miniflow *a, const struct flow *b,
+ const struct minimask *mask)
{
+ const uint32_t *b_u32 = (const uint32_t *) b;
+ const uint32_t *p;
int i;
- for (i = 0; i < FLOW_N_REGS; i++) {
- if ((a->reg_masks[i] & b->reg_masks[i]) != b->reg_masks[i]) {
- return true;
+ p = mask->masks.values;
+ for (i = 0; i < MINI_N_MAPS; i++) {
+ uint32_t map;
+
+ for (map = mask->masks.map[i]; map; map = zero_rightmost_1bit(map)) {
+ int ofs = raw_ctz(map) + i * 32;
+
+ if ((miniflow_get(a, ofs) ^ b_u32[ofs]) & *p) {
+ return false;
+ }
+ p++;
}
}
- return (a->wildcards & ~b->wildcards
- || (a->nw_src_mask & b->nw_src_mask) != b->nw_src_mask
- || (a->nw_dst_mask & b->nw_dst_mask) != b->nw_dst_mask
- || (a->vlan_tci_mask & b->vlan_tci_mask) != b->vlan_tci_mask);
+ return true;
}
-static bool
-set_nw_mask(ovs_be32 *maskp, ovs_be32 mask)
+/* Returns a hash value for 'flow', given 'basis'. */
+uint32_t
+miniflow_hash(const struct miniflow *flow, uint32_t basis)
{
- if (ip_is_cidr(mask)) {
- *maskp = mask;
- return true;
- } else {
- return false;
+ BUILD_ASSERT_DECL(MINI_N_MAPS == 2);
+ return hash_3words(flow->map[0], flow->map[1],
+ hash_words(flow->values, miniflow_n_values(flow),
+ basis));
+}
+
+/* Returns a hash value for the bits of 'flow' where there are 1-bits in
+ * 'mask', given 'basis'.
+ *
+ * The hash values returned by this function are the same as those returned by
+ * flow_hash_in_minimask(), only the form of the arguments differ. */
+uint32_t
+miniflow_hash_in_minimask(const struct miniflow *flow,
+ const struct minimask *mask, uint32_t basis)
+{
+ const uint32_t *p = mask->masks.values;
+ uint32_t hash;
+ int i;
+
+ hash = basis;
+ for (i = 0; i < MINI_N_MAPS; i++) {
+ uint32_t map;
+
+ for (map = mask->masks.map[i]; map; map = zero_rightmost_1bit(map)) {
+ int ofs = raw_ctz(map) + i * 32;
+
+ hash = mhash_add(hash, miniflow_get(flow, ofs) & *p);
+ p++;
+ }
+ }
+
+ return mhash_finish(hash, p - mask->masks.values);
+}
+
+/* Returns a hash value for the bits of 'flow' where there are 1-bits in
+ * 'mask', given 'basis'.
+ *
+ * The hash values returned by this function are the same as those returned by
+ * miniflow_hash_in_minimask(), only the form of the arguments differ. */
+uint32_t
+flow_hash_in_minimask(const struct flow *flow, const struct minimask *mask,
+ uint32_t basis)
+{
+ const uint32_t *flow_u32 = (const uint32_t *) flow;
+ const uint32_t *p = mask->masks.values;
+ uint32_t hash;
+ int i;
+
+ hash = basis;
+ for (i = 0; i < MINI_N_MAPS; i++) {
+ uint32_t map;
+
+ for (map = mask->masks.map[i]; map; map = zero_rightmost_1bit(map)) {
+ int ofs = raw_ctz(map) + i * 32;
+
+ hash = mhash_add(hash, flow_u32[ofs] & *p);
+ p++;
+ }
+ }
+
+ return mhash_finish(hash, p - mask->masks.values);
+}
+\f
+/* Initializes 'dst' as a copy of 'src'. The caller must eventually free 'dst'
+ * with minimask_destroy(). */
+void
+minimask_init(struct minimask *mask, const struct flow_wildcards *wc)
+{
+ miniflow_init(&mask->masks, &wc->masks);
+}
+
+/* Initializes 'dst' as a copy of 'src'. The caller must eventually free 'dst'
+ * with minimask_destroy(). */
+void
+minimask_clone(struct minimask *dst, const struct minimask *src)
+{
+ miniflow_clone(&dst->masks, &src->masks);
+}
+
+/* Initializes 'dst_' as the bit-wise "and" of 'a_' and 'b_'.
+ *
+ * The caller must provide room for FLOW_U32S "uint32_t"s in 'storage', for use
+ * by 'dst_'. The caller must *not* free 'dst_' with minimask_destroy(). */
+void
+minimask_combine(struct minimask *dst_,
+ const struct minimask *a_, const struct minimask *b_,
+ uint32_t storage[FLOW_U32S])
+{
+ struct miniflow *dst = &dst_->masks;
+ const struct miniflow *a = &a_->masks;
+ const struct miniflow *b = &b_->masks;
+ int i, n;
+
+ n = 0;
+ dst->values = storage;
+ for (i = 0; i < MINI_N_MAPS; i++) {
+ uint32_t map;
+
+ dst->map[i] = 0;
+ for (map = a->map[i] & b->map[i]; map;
+ map = zero_rightmost_1bit(map)) {
+ int ofs = raw_ctz(map) + i * 32;
+ uint32_t mask = miniflow_get(a, ofs) & miniflow_get(b, ofs);
+
+ if (mask) {
+ dst->map[i] |= rightmost_1bit(map);
+ dst->values[n++] = mask;
+ }
+ }
}
}
-/* Sets the IP (or ARP) source wildcard mask to CIDR 'mask' (consisting of N
- * high-order 1-bit and 32-N low-order 0-bits). Returns true if successful,
- * false if 'mask' is not a CIDR mask. */
+/* Frees any memory owned by 'mask'. Does not free the storage in which 'mask'
+ * itself resides; the caller is responsible for that. */
+void
+minimask_destroy(struct minimask *mask)
+{
+ miniflow_destroy(&mask->masks);
+}
+
+/* Initializes 'dst' as a copy of 'src'. */
+void
+minimask_expand(const struct minimask *mask, struct flow_wildcards *wc)
+{
+ miniflow_expand(&mask->masks, &wc->masks);
+}
+
+/* Returns the uint32_t that would be at byte offset '4 * u32_ofs' if 'mask'
+ * were expanded into a "struct flow_wildcards". */
+uint32_t
+minimask_get(const struct minimask *mask, unsigned int u32_ofs)
+{
+ return miniflow_get(&mask->masks, u32_ofs);
+}
+
+/* Returns the VID mask within the vlan_tci member of the "struct
+ * flow_wildcards" represented by 'mask'. */
+uint16_t
+minimask_get_vid_mask(const struct minimask *mask)
+{
+ return miniflow_get_vid(&mask->masks);
+}
+
+/* Returns true if 'a' and 'b' are the same flow mask, false otherwise. */
bool
-flow_wildcards_set_nw_src_mask(struct flow_wildcards *wc, ovs_be32 mask)
+minimask_equal(const struct minimask *a, const struct minimask *b)
{
- return set_nw_mask(&wc->nw_src_mask, mask);
+ return miniflow_equal(&a->masks, &b->masks);
}
-/* Sets the IP (or ARP) destination wildcard mask to CIDR 'mask' (consisting of
- * N high-order 1-bit and 32-N low-order 0-bits). Returns true if successful,
- * false if 'mask' is not a CIDR mask. */
+/* Returns a hash value for 'mask', given 'basis'. */
+uint32_t
+minimask_hash(const struct minimask *mask, uint32_t basis)
+{
+ return miniflow_hash(&mask->masks, basis);
+}
+
+/* Returns true if at least one bit is wildcarded in 'a_' but not in 'b_',
+ * false otherwise. */
bool
-flow_wildcards_set_nw_dst_mask(struct flow_wildcards *wc, ovs_be32 mask)
+minimask_has_extra(const struct minimask *a_, const struct minimask *b_)
{
- return set_nw_mask(&wc->nw_dst_mask, mask);
+ const struct miniflow *a = &a_->masks;
+ const struct miniflow *b = &b_->masks;
+ int i;
+
+ for (i = 0; i < MINI_N_MAPS; i++) {
+ uint32_t map;
+
+ for (map = a->map[i] | b->map[i]; map;
+ map = zero_rightmost_1bit(map)) {
+ int ofs = raw_ctz(map) + i * 32;
+ uint32_t a_u32 = miniflow_get(a, ofs);
+ uint32_t b_u32 = miniflow_get(b, ofs);
+
+ if ((a_u32 & b_u32) != b_u32) {
+ return true;
+ }
+ }
+ }
+
+ return false;
}
-/* Sets the wildcard mask for register 'idx' in 'wc' to 'mask'.
- * (A 0-bit indicates a wildcard bit.) */
-void
-flow_wildcards_set_reg_mask(struct flow_wildcards *wc, int idx, uint32_t mask)
+/* Returns true if 'mask' matches every packet, false if 'mask' fixes any bits
+ * or fields. */
+bool
+minimask_is_catchall(const struct minimask *mask_)
{
- wc->reg_masks[idx] = mask;
+ const struct miniflow *mask = &mask_->masks;
+
+ BUILD_ASSERT(MINI_N_MAPS == 2);
+ return !(mask->map[0] | mask->map[1]);
}
projects / cascardo / ovs.git / blobdiff