X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=lib%2Fclassifier.c;h=dab8f620fbb6622422c8e6a37cdcf604462aec14;hb=28da1f8f725fc2a797174df18a7b3e31ef49ede0;hp=3387767bb211dc642b2ac5d7d61329857c7f2318;hpb=5ecc9d8156062191f0d53ba3dc2c5776c962b7c5;p=sliver-openvswitch.git

diff --git a/lib/classifier.c b/lib/classifier.c
index 3387767bb..dab8f620f 100644
--- a/lib/classifier.c
+++ b/lib/classifier.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009, 2010 Nicira Networks.
+ * Copyright (c) 2009, 2010, 2011 Nicira Networks.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,9 +19,12 @@
 #include <assert.h>
 #include <errno.h>
 #include <netinet/in.h>
+#include "byte-order.h"
 #include "dynamic-string.h"
 #include "flow.h"
 #include "hash.h"
+#include "odp-util.h"
+#include "ofp-util.h"
 #include "packets.h"
 
 static struct cls_table *find_table(const struct classifier *,
@@ -29,9 +32,6 @@ static struct cls_table *find_table(const struct classifier *,
 static struct cls_table *insert_table(struct classifier *,
                                       const struct flow_wildcards *);
 
-static struct cls_table *classifier_first_table(const struct classifier *);
-static struct cls_table *classifier_next_table(const struct classifier *,
-                                               const struct cls_table *);
 static void destroy_table(struct classifier *, struct cls_table *);
 
 static struct cls_rule *find_match(const struct cls_table *,
@@ -42,7 +42,6 @@ static struct cls_rule *insert_rule(struct cls_table *, struct cls_rule *);
 
 static bool flow_equal_except(const struct flow *, const struct flow *,
                                 const struct flow_wildcards *);
-static void zero_wildcards(struct flow *, const struct flow_wildcards *);
 
 /* Iterates RULE over HEAD and all of the cls_rules on HEAD->list. */
 #define FOR_EACH_RULE_IN_LIST(RULE, HEAD)                               \
@@ -52,14 +51,9 @@ static void zero_wildcards(struct flow *, const struct flow_wildcards *);
          (RULE) != NULL && ((NEXT) = next_rule_in_list(RULE), true);    \
          (RULE) = (NEXT))
 
+static struct cls_rule *next_rule_in_list__(struct cls_rule *);
 static struct cls_rule *next_rule_in_list(struct cls_rule *);
 
-static struct cls_table *
-cls_table_from_hmap_node(const struct hmap_node *node)
-{
-    return node ? CONTAINER_OF(node, struct cls_table, hmap_node) : NULL;
-}
-
 /* Converts the flow in 'flow' into a cls_rule in 'rule', with the given
  * 'wildcards' and 'priority'. */
 void
@@ -80,30 +74,18 @@ cls_rule_init_exact(const struct flow *flow,
                     unsigned int priority, struct cls_rule *rule)
 {
     rule->flow = *flow;
+    rule->flow.priority = 0;
     flow_wildcards_init_exact(&rule->wc);
     rule->priority = priority;
 }
 
-/* Converts the ofp_match in 'match' (with format 'flow_format', one of NXFF_*)
- * into a cls_rule in 'rule', with the given 'priority'.  'cookie' is used
- * when 'flow_format' is NXFF_TUN_ID_FROM_COOKIE. */
-void
-cls_rule_from_match(const struct ofp_match *match, unsigned int priority,
-                    int flow_format, uint64_t cookie,
-                    struct cls_rule *rule)
-{
-    flow_from_match(match, flow_format, cookie, &rule->flow, &rule->wc);
-    rule->priority = !rule->wc.wildcards ? UINT16_MAX : priority;
-    cls_rule_zero_wildcarded_fields(rule);
-}
-
 /* Initializes 'rule' as a "catch-all" rule that matches every packet, with
  * priority 'priority'. */
 void
 cls_rule_init_catchall(struct cls_rule *rule, unsigned int priority)
 {
     memset(&rule->flow, 0, sizeof rule->flow);
-    flow_wildcards_init(&rule->wc, OVSFW_ALL | FWW_ALL);
+    flow_wildcards_init_catchall(&rule->wc);
     rule->priority = priority;
 }
 
@@ -118,192 +100,581 @@ cls_rule_init_catchall(struct cls_rule *rule, unsigned int priority)
 void
 cls_rule_zero_wildcarded_fields(struct cls_rule *rule)
 {
-    zero_wildcards(&rule->flow, &rule->wc);
+    flow_zero_wildcards(&rule->flow, &rule->wc);
+}
+
+void
+cls_rule_set_reg(struct cls_rule *rule, unsigned int reg_idx, uint32_t value)
+{
+    cls_rule_set_reg_masked(rule, reg_idx, value, UINT32_MAX);
+}
+
+void
+cls_rule_set_reg_masked(struct cls_rule *rule, unsigned int reg_idx,
+                        uint32_t value, uint32_t mask)
+{
+    assert(reg_idx < FLOW_N_REGS);
+    flow_wildcards_set_reg_mask(&rule->wc, reg_idx, mask);
+    rule->flow.regs[reg_idx] = value & mask;
+}
+
+void
+cls_rule_set_tun_id(struct cls_rule *rule, ovs_be64 tun_id)
+{
+    cls_rule_set_tun_id_masked(rule, tun_id, htonll(UINT64_MAX));
+}
+
+void
+cls_rule_set_tun_id_masked(struct cls_rule *rule,
+                           ovs_be64 tun_id, ovs_be64 mask)
+{
+    rule->wc.tun_id_mask = mask;
+    rule->flow.tun_id = tun_id & mask;
 }
 
 void
-cls_rule_set_in_port(struct cls_rule *rule, uint16_t odp_port)
+cls_rule_set_in_port(struct cls_rule *rule, uint16_t ofp_port)
 {
-    rule->wc.wildcards &= ~OFPFW_IN_PORT;
-    rule->flow.in_port = odp_port;
+    rule->wc.wildcards &= ~FWW_IN_PORT;
+    rule->flow.in_port = ofp_port;
 }
 
 void
 cls_rule_set_dl_type(struct cls_rule *rule, ovs_be16 dl_type)
 {
-    rule->wc.wildcards &= ~OFPFW_DL_TYPE;
+    rule->wc.wildcards &= ~FWW_DL_TYPE;
     rule->flow.dl_type = dl_type;
 }
 
 void
 cls_rule_set_dl_src(struct cls_rule *rule, const uint8_t dl_src[ETH_ADDR_LEN])
 {
-    rule->wc.wildcards &= ~OFPFW_DL_SRC;
+    rule->wc.wildcards &= ~FWW_DL_SRC;
     memcpy(rule->flow.dl_src, dl_src, ETH_ADDR_LEN);
 }
 
+/* Modifies 'rule' so that the Ethernet address must match 'dl_dst' exactly. */
 void
 cls_rule_set_dl_dst(struct cls_rule *rule, const uint8_t dl_dst[ETH_ADDR_LEN])
 {
-    rule->wc.wildcards &= ~(OFPFW_DL_DST | FWW_ETH_MCAST);
+    rule->wc.wildcards &= ~(FWW_DL_DST | FWW_ETH_MCAST);
     memcpy(rule->flow.dl_dst, dl_dst, ETH_ADDR_LEN);
 }
 
-bool
+/* Modifies 'rule' so that the Ethernet address must match 'dl_dst' after each
+ * byte is ANDed with the appropriate byte in 'mask'.
+ *
+ * This function will assert-fail if 'mask' is invalid.  Only 'mask' values
+ * accepted by flow_wildcards_is_dl_dst_mask_valid() are allowed. */
+void
+cls_rule_set_dl_dst_masked(struct cls_rule *rule,
+                           const uint8_t dl_dst[ETH_ADDR_LEN],
+                           const uint8_t mask[ETH_ADDR_LEN])
+{
+    flow_wildcards_t *wc = &rule->wc.wildcards;
+    size_t i;
+
+    *wc = flow_wildcards_set_dl_dst_mask(*wc, mask);
+    for (i = 0; i < ETH_ADDR_LEN; i++) {
+        rule->flow.dl_dst[i] = dl_dst[i] & mask[i];
+    }
+}
+
+void
 cls_rule_set_dl_tci(struct cls_rule *rule, ovs_be16 tci)
 {
-    return cls_rule_set_dl_tci_masked(rule, tci, htons(0xffff));
+    cls_rule_set_dl_tci_masked(rule, tci, htons(0xffff));
 }
 
-bool
+void
 cls_rule_set_dl_tci_masked(struct cls_rule *rule, ovs_be16 tci, ovs_be16 mask)
 {
-    switch (ntohs(mask)) {
-    case 0xffff:
-        if (tci == htons(0)) {
-            /* Match only packets that have no 802.1Q header. */
-            rule->wc.wildcards &= ~(OFPFW_DL_VLAN | OFPFW_DL_VLAN_PCP);
-            rule->flow.dl_vlan = htons(OFP_VLAN_NONE);
-            rule->flow.dl_vlan_pcp = 0;
-            return true;
-        } else if (tci & htons(VLAN_CFI)) {
-            /* Match only packets that have a specific 802.1Q VID and PCP. */
-            rule->wc.wildcards &= ~(OFPFW_DL_VLAN | OFPFW_DL_VLAN_PCP);
-            rule->flow.dl_vlan = htons(vlan_tci_to_vid(tci));
-            rule->flow.dl_vlan_pcp = vlan_tci_to_pcp(tci);
-            return true;
-        } else {
-            /* Impossible. */
-            return false;
-        }
-
-    case 0x1fff:
-        if (!(tci & htons(VLAN_CFI))) {
-            return false;
-        } else {
-            /* Match only packets that have a specific 802.1Q VID. */
-            cls_rule_set_dl_vlan(rule, tci & htons(VLAN_VID_MASK));
-            rule->wc.wildcards |= OFPFW_DL_VLAN_PCP;
-            rule->flow.dl_vlan_pcp = 0;
-            return true;
-        }
-
-    case 0xf000:
-        if (!(tci & htons(VLAN_CFI))) {
-            return false;
-        } else {
-            /* Match only packets that have a specific 802.1Q PCP. */
-            cls_rule_set_dl_vlan_pcp(rule, vlan_tci_to_pcp(tci));
-            rule->wc.wildcards |= OFPFW_DL_VLAN;
-            rule->flow.dl_vlan = 0;
-            return true;
-        }
-
-    case 0x0000:
-        /* Match anything. */
-        rule->wc.wildcards |= OFPFW_DL_VLAN | OFPFW_DL_VLAN_PCP;
-        rule->flow.dl_vlan = htons(0);
-        rule->flow.dl_vlan_pcp = 0;
-        return true;
+    rule->flow.vlan_tci = tci & mask;
+    rule->wc.vlan_tci_mask = mask;
+}
 
-    default:
-        return false;
+/* Modifies 'rule' so that the VLAN VID is wildcarded.  If the PCP is already
+ * wildcarded, then 'rule' will match a packet regardless of whether it has an
+ * 802.1Q header or not. */
+void
+cls_rule_set_any_vid(struct cls_rule *rule)
+{
+    if (rule->wc.vlan_tci_mask & htons(VLAN_PCP_MASK)) {
+        rule->wc.vlan_tci_mask &= ~htons(VLAN_VID_MASK);
+        rule->flow.vlan_tci &= ~htons(VLAN_VID_MASK);
+    } else {
+        cls_rule_set_dl_tci_masked(rule, htons(0), htons(0));
     }
 }
 
+/* Modifies 'rule' depending on 'dl_vlan':
+ *
+ *   - If 'dl_vlan' is htons(OFP_VLAN_NONE), makes 'rule' match only packets
+ *     without an 802.1Q header.
+ *
+ *   - Otherwise, makes 'rule' match only packets with an 802.1Q header whose
+ *     VID equals the low 12 bits of 'dl_vlan'.
+ */
 void
 cls_rule_set_dl_vlan(struct cls_rule *rule, ovs_be16 dl_vlan)
 {
-    if (dl_vlan != htons(OFP_VLAN_NONE)) {
-        dl_vlan &= htons(VLAN_VID_MASK);
+    flow_set_vlan_vid(&rule->flow, dl_vlan);
+    if (dl_vlan == htons(OFP_VLAN_NONE)) {
+        rule->wc.vlan_tci_mask = htons(UINT16_MAX);
+    } else {
+        rule->wc.vlan_tci_mask |= htons(VLAN_VID_MASK | VLAN_CFI);
     }
+}
 
-    rule->wc.wildcards &= ~OFPFW_DL_VLAN;
-    rule->flow.dl_vlan = dl_vlan;
+/* Modifies 'rule' so that the VLAN PCP is wildcarded.  If the VID is already
+ * wildcarded, then 'rule' will match a packet regardless of whether it has an
+ * 802.1Q header or not. */
+void
+cls_rule_set_any_pcp(struct cls_rule *rule)
+{
+    if (rule->wc.vlan_tci_mask & htons(VLAN_VID_MASK)) {
+        rule->wc.vlan_tci_mask &= ~htons(VLAN_PCP_MASK);
+        rule->flow.vlan_tci &= ~htons(VLAN_PCP_MASK);
+    } else {
+        cls_rule_set_dl_tci_masked(rule, htons(0), htons(0));
+    }
 }
 
+/* Modifies 'rule' so that it matches only packets with an 802.1Q header whose
+ * PCP equals the low 3 bits of 'dl_vlan_pcp'. */
 void
 cls_rule_set_dl_vlan_pcp(struct cls_rule *rule, uint8_t dl_vlan_pcp)
 {
-    rule->wc.wildcards &= ~OFPFW_DL_VLAN_PCP;
-    rule->flow.dl_vlan_pcp = dl_vlan_pcp & 0x07;
+    flow_set_vlan_pcp(&rule->flow, dl_vlan_pcp);
+    rule->wc.vlan_tci_mask |= htons(VLAN_CFI | VLAN_PCP_MASK);
 }
 
 void
 cls_rule_set_tp_src(struct cls_rule *rule, ovs_be16 tp_src)
 {
-    rule->wc.wildcards &= ~OFPFW_TP_SRC;
+    rule->wc.wildcards &= ~FWW_TP_SRC;
     rule->flow.tp_src = tp_src;
 }
 
 void
 cls_rule_set_tp_dst(struct cls_rule *rule, ovs_be16 tp_dst)
 {
-    rule->wc.wildcards &= ~OFPFW_TP_DST;
+    rule->wc.wildcards &= ~FWW_TP_DST;
     rule->flow.tp_dst = tp_dst;
 }
 
 void
 cls_rule_set_nw_proto(struct cls_rule *rule, uint8_t nw_proto)
 {
-    rule->wc.wildcards &= ~OFPFW_NW_PROTO;
+    rule->wc.wildcards &= ~FWW_NW_PROTO;
     rule->flow.nw_proto = nw_proto;
 }
 
 void
 cls_rule_set_nw_src(struct cls_rule *rule, ovs_be32 nw_src)
 {
-    cls_rule_set_nw_src_masked(rule, nw_src, htonl(UINT32_MAX));
+    rule->flow.nw_src = nw_src;
+    rule->wc.nw_src_mask = htonl(UINT32_MAX);
 }
 
-bool
-cls_rule_set_nw_src_masked(struct cls_rule *rule, ovs_be32 ip, ovs_be32 mask)
+void
+cls_rule_set_nw_src_masked(struct cls_rule *rule,
+                           ovs_be32 nw_src, ovs_be32 mask)
 {
-    if (flow_wildcards_set_nw_src_mask(&rule->wc, mask)) {
-        rule->flow.nw_src = ip & mask;
-        return true;
-    } else {
-        return false;
-    }
+    rule->flow.nw_src = nw_src & mask;
+    rule->wc.nw_src_mask = mask;
 }
 
 void
 cls_rule_set_nw_dst(struct cls_rule *rule, ovs_be32 nw_dst)
 {
-    cls_rule_set_nw_dst_masked(rule, nw_dst, htonl(UINT32_MAX));
+    rule->flow.nw_dst = nw_dst;
+    rule->wc.nw_dst_mask = htonl(UINT32_MAX);
 }
 
-bool
+void
 cls_rule_set_nw_dst_masked(struct cls_rule *rule, ovs_be32 ip, ovs_be32 mask)
 {
-    if (flow_wildcards_set_nw_dst_mask(&rule->wc, mask)) {
-        rule->flow.nw_dst = ip & mask;
-        return true;
-    } else {
-        return false;
-    }
+    rule->flow.nw_dst = ip & mask;
+    rule->wc.nw_dst_mask = mask;
 }
 
 void
-cls_rule_set_nw_tos(struct cls_rule *rule, uint8_t nw_tos)
+cls_rule_set_nw_dscp(struct cls_rule *rule, uint8_t nw_dscp)
 {
-    rule->wc.wildcards &= ~OFPFW_NW_TOS;
-    rule->flow.nw_tos = nw_tos & IP_DSCP_MASK;
+    rule->wc.wildcards &= ~FWW_NW_DSCP;
+    rule->flow.nw_tos &= ~IP_DSCP_MASK;
+    rule->flow.nw_tos |= nw_dscp & IP_DSCP_MASK;
 }
 
 void
-cls_rule_set_icmp_type(struct cls_rule *rule, uint8_t icmp_type)
+cls_rule_set_nw_ecn(struct cls_rule *rule, uint8_t nw_ecn)
+{
+    rule->wc.wildcards &= ~FWW_NW_ECN;
+    rule->flow.nw_tos &= ~IP_ECN_MASK;
+    rule->flow.nw_tos |= nw_ecn & IP_ECN_MASK;
+}
+
+void
+cls_rule_set_nw_ttl(struct cls_rule *rule, uint8_t nw_ttl)
+{
+    rule->wc.wildcards &= ~FWW_NW_TTL;
+    rule->flow.nw_ttl = nw_ttl;
+}
+
+void
+cls_rule_set_nw_frag(struct cls_rule *rule, uint8_t nw_frag)
 {
-    rule->wc.wildcards &= ~OFPFW_ICMP_TYPE;
-    rule->flow.icmp_type = htons(icmp_type);
+    rule->wc.nw_frag_mask |= FLOW_NW_FRAG_MASK;
+    rule->flow.nw_frag = nw_frag;
+}
 
+void
+cls_rule_set_nw_frag_masked(struct cls_rule *rule,
+                            uint8_t nw_frag, uint8_t mask)
+{
+    rule->flow.nw_frag = nw_frag & mask;
+    rule->wc.nw_frag_mask = mask;
+}
+
+void
+cls_rule_set_icmp_type(struct cls_rule *rule, uint8_t icmp_type)
+{
+    rule->wc.wildcards &= ~FWW_TP_SRC;
+    rule->flow.tp_src = htons(icmp_type);
 }
 
 void
 cls_rule_set_icmp_code(struct cls_rule *rule, uint8_t icmp_code)
 {
-    rule->wc.wildcards &= ~OFPFW_ICMP_CODE;
-    rule->flow.icmp_code = htons(icmp_code);
+    rule->wc.wildcards &= ~FWW_TP_DST;
+    rule->flow.tp_dst = htons(icmp_code);
+}
+
+void
+cls_rule_set_arp_sha(struct cls_rule *rule, const uint8_t sha[ETH_ADDR_LEN])
+{
+    rule->wc.wildcards &= ~FWW_ARP_SHA;
+    memcpy(rule->flow.arp_sha, sha, ETH_ADDR_LEN);
+}
+
+void
+cls_rule_set_arp_tha(struct cls_rule *rule, const uint8_t tha[ETH_ADDR_LEN])
+{
+    rule->wc.wildcards &= ~FWW_ARP_THA;
+    memcpy(rule->flow.arp_tha, tha, ETH_ADDR_LEN);
+}
+
+void
+cls_rule_set_ipv6_src(struct cls_rule *rule, const struct in6_addr *src)
+{
+    rule->flow.ipv6_src = *src;
+    rule->wc.ipv6_src_mask = in6addr_exact;
+}
+
+void
+cls_rule_set_ipv6_src_masked(struct cls_rule *rule, const struct in6_addr *src,
+                             const struct in6_addr *mask)
+{
+    rule->flow.ipv6_src = ipv6_addr_bitand(src, mask);
+    rule->wc.ipv6_src_mask = *mask;
+}
+
+void
+cls_rule_set_ipv6_dst(struct cls_rule *rule, const struct in6_addr *dst)
+{
+    rule->flow.ipv6_dst = *dst;
+    rule->wc.ipv6_dst_mask = in6addr_exact;
+}
+
+void
+cls_rule_set_ipv6_dst_masked(struct cls_rule *rule, const struct in6_addr *dst,
+                             const struct in6_addr *mask)
+{
+    rule->flow.ipv6_dst = ipv6_addr_bitand(dst, mask);
+    rule->wc.ipv6_dst_mask = *mask;
+}
+
+void
+cls_rule_set_ipv6_label(struct cls_rule *rule, ovs_be32 ipv6_label)
+{
+    rule->wc.wildcards &= ~FWW_IPV6_LABEL;
+    rule->flow.ipv6_label = ipv6_label;
+}
+
+void
+cls_rule_set_nd_target(struct cls_rule *rule, const struct in6_addr *target)
+{
+    rule->wc.wildcards &= ~FWW_ND_TARGET;
+    rule->flow.nd_target = *target;
+}
+
+/* Returns true if 'a' and 'b' have the same priority, wildcard the same
+ * fields, and have the same values for fixed fields, otherwise false. */
+bool
+cls_rule_equal(const struct cls_rule *a, const struct cls_rule *b)
+{
+    return (a->priority == b->priority
+            && flow_wildcards_equal(&a->wc, &b->wc)
+            && flow_equal(&a->flow, &b->flow));
+}
+
+/* Returns a hash value for the flow, wildcards, and priority in 'rule',
+ * starting from 'basis'. */
+uint32_t
+cls_rule_hash(const struct cls_rule *rule, uint32_t basis)
+{
+    uint32_t h0 = flow_hash(&rule->flow, basis);
+    uint32_t h1 = flow_wildcards_hash(&rule->wc, h0);
+    return hash_int(rule->priority, h1);
+}
+
+static void
+format_ip_netmask(struct ds *s, const char *name, ovs_be32 ip,
+                  ovs_be32 netmask)
+{
+    if (netmask) {
+        ds_put_format(s, "%s=", name);
+        ip_format_masked(ip, netmask, s);
+        ds_put_char(s, ',');
+    }
+}
+
+static void
+format_ipv6_netmask(struct ds *s, const char *name,
+                    const struct in6_addr *addr,
+                    const struct in6_addr *netmask)
+{
+    if (!ipv6_mask_is_any(netmask)) {
+        ds_put_format(s, "%s=", name);
+        print_ipv6_masked(s, addr, netmask);
+        ds_put_char(s, ',');
+    }
+}
+
+void
+cls_rule_format(const struct cls_rule *rule, struct ds *s)
+{
+    const struct flow_wildcards *wc = &rule->wc;
+    size_t start_len = s->length;
+    flow_wildcards_t w = wc->wildcards;
+    const struct flow *f = &rule->flow;
+    bool skip_type = false;
+    bool skip_proto = false;
+
+    int i;
+
+    BUILD_ASSERT_DECL(FLOW_WC_SEQ == 7);
+
+    if (rule->priority != OFP_DEFAULT_PRIORITY) {
+        ds_put_format(s, "priority=%d,", rule->priority);
+    }
+
+    if (!(w & FWW_DL_TYPE)) {
+        skip_type = true;
+        if (f->dl_type == htons(ETH_TYPE_IP)) {
+            if (!(w & FWW_NW_PROTO)) {
+                skip_proto = true;
+                if (f->nw_proto == IPPROTO_ICMP) {
+                    ds_put_cstr(s, "icmp,");
+                } else if (f->nw_proto == IPPROTO_TCP) {
+                    ds_put_cstr(s, "tcp,");
+                } else if (f->nw_proto == IPPROTO_UDP) {
+                    ds_put_cstr(s, "udp,");
+                } else {
+                    ds_put_cstr(s, "ip,");
+                    skip_proto = false;
+                }
+            } else {
+                ds_put_cstr(s, "ip,");
+            }
+        } else if (f->dl_type == htons(ETH_TYPE_IPV6)) {
+            if (!(w & FWW_NW_PROTO)) {
+                skip_proto = true;
+                if (f->nw_proto == IPPROTO_ICMPV6) {
+                    ds_put_cstr(s, "icmp6,");
+                } else if (f->nw_proto == IPPROTO_TCP) {
+                    ds_put_cstr(s, "tcp6,");
+                } else if (f->nw_proto == IPPROTO_UDP) {
+                    ds_put_cstr(s, "udp6,");
+                } else {
+                    ds_put_cstr(s, "ipv6,");
+                    skip_proto = false;
+                }
+            } else {
+                ds_put_cstr(s, "ipv6,");
+            }
+        } else if (f->dl_type == htons(ETH_TYPE_ARP)) {
+            ds_put_cstr(s, "arp,");
+        } else {
+            skip_type = false;
+        }
+    }
+    for (i = 0; i < FLOW_N_REGS; i++) {
+        switch (wc->reg_masks[i]) {
+        case 0:
+            break;
+        case UINT32_MAX:
+            ds_put_format(s, "reg%d=0x%"PRIx32",", i, f->regs[i]);
+            break;
+        default:
+            ds_put_format(s, "reg%d=0x%"PRIx32"/0x%"PRIx32",",
+                          i, f->regs[i], wc->reg_masks[i]);
+            break;
+        }
+    }
+    switch (wc->tun_id_mask) {
+    case 0:
+        break;
+    case CONSTANT_HTONLL(UINT64_MAX):
+        ds_put_format(s, "tun_id=%#"PRIx64",", ntohll(f->tun_id));
+        break;
+    default:
+        ds_put_format(s, "tun_id=%#"PRIx64"/%#"PRIx64",",
+                      ntohll(f->tun_id), ntohll(wc->tun_id_mask));
+        break;
+    }
+    if (!(w & FWW_IN_PORT)) {
+        ds_put_format(s, "in_port=%"PRIu16",", f->in_port);
+    }
+    if (wc->vlan_tci_mask) {
+        ovs_be16 vid_mask = wc->vlan_tci_mask & htons(VLAN_VID_MASK);
+        ovs_be16 pcp_mask = wc->vlan_tci_mask & htons(VLAN_PCP_MASK);
+        ovs_be16 cfi = wc->vlan_tci_mask & htons(VLAN_CFI);
+
+        if (cfi && f->vlan_tci & htons(VLAN_CFI)
+            && (!vid_mask || vid_mask == htons(VLAN_VID_MASK))
+            && (!pcp_mask || pcp_mask == htons(VLAN_PCP_MASK))
+            && (vid_mask || pcp_mask)) {
+            if (vid_mask) {
+                ds_put_format(s, "dl_vlan=%"PRIu16",",
+                              vlan_tci_to_vid(f->vlan_tci));
+            }
+            if (pcp_mask) {
+                ds_put_format(s, "dl_vlan_pcp=%d,",
+                              vlan_tci_to_pcp(f->vlan_tci));
+            }
+        } else if (wc->vlan_tci_mask == htons(0xffff)) {
+            ds_put_format(s, "vlan_tci=0x%04"PRIx16",", ntohs(f->vlan_tci));
+        } else {
+            ds_put_format(s, "vlan_tci=0x%04"PRIx16"/0x%04"PRIx16",",
+                          ntohs(f->vlan_tci), ntohs(wc->vlan_tci_mask));
+        }
+    }
+    if (!(w & FWW_DL_SRC)) {
+        ds_put_format(s, "dl_src="ETH_ADDR_FMT",", ETH_ADDR_ARGS(f->dl_src));
+    }
+    switch (w & (FWW_DL_DST | FWW_ETH_MCAST)) {
+    case 0:
+        ds_put_format(s, "dl_dst="ETH_ADDR_FMT",", ETH_ADDR_ARGS(f->dl_dst));
+        break;
+    case FWW_DL_DST:
+        ds_put_format(s, "dl_dst="ETH_ADDR_FMT"/01:00:00:00:00:00,",
+                      ETH_ADDR_ARGS(f->dl_dst));
+        break;
+    case FWW_ETH_MCAST:
+        ds_put_format(s, "dl_dst="ETH_ADDR_FMT"/fe:ff:ff:ff:ff:ff,",
+                      ETH_ADDR_ARGS(f->dl_dst));
+        break;
+    case FWW_DL_DST | FWW_ETH_MCAST:
+        break;
+    }
+    if (!skip_type && !(w & FWW_DL_TYPE)) {
+        ds_put_format(s, "dl_type=0x%04"PRIx16",", ntohs(f->dl_type));
+    }
+    if (f->dl_type == htons(ETH_TYPE_IPV6)) {
+        format_ipv6_netmask(s, "ipv6_src", &f->ipv6_src, &wc->ipv6_src_mask);
+        format_ipv6_netmask(s, "ipv6_dst", &f->ipv6_dst, &wc->ipv6_dst_mask);
+        if (!(w & FWW_IPV6_LABEL)) {
+            ds_put_format(s, "ipv6_label=0x%05"PRIx32",", ntohl(f->ipv6_label));
+        }
+    } else {
+        format_ip_netmask(s, "nw_src", f->nw_src, wc->nw_src_mask);
+        format_ip_netmask(s, "nw_dst", f->nw_dst, wc->nw_dst_mask);
+    }
+    if (!skip_proto && !(w & FWW_NW_PROTO)) {
+        if (f->dl_type == htons(ETH_TYPE_ARP)) {
+            ds_put_format(s, "arp_op=%"PRIu8",", f->nw_proto);
+        } else {
+            ds_put_format(s, "nw_proto=%"PRIu8",", f->nw_proto);
+        }
+    }
+    if (f->dl_type == htons(ETH_TYPE_ARP)) {
+        if (!(w & FWW_ARP_SHA)) {
+            ds_put_format(s, "arp_sha="ETH_ADDR_FMT",",
+                    ETH_ADDR_ARGS(f->arp_sha));
+        }
+        if (!(w & FWW_ARP_THA)) {
+            ds_put_format(s, "arp_tha="ETH_ADDR_FMT",",
+                    ETH_ADDR_ARGS(f->arp_tha));
+        }
+    }
+    if (!(w & FWW_NW_DSCP)) {
+        ds_put_format(s, "nw_tos=%"PRIu8",", f->nw_tos & IP_DSCP_MASK);
+    }
+    if (!(w & FWW_NW_ECN)) {
+        ds_put_format(s, "nw_ecn=%"PRIu8",", f->nw_tos & IP_ECN_MASK);
+    }
+    if (!(w & FWW_NW_TTL)) {
+        ds_put_format(s, "nw_ttl=%"PRIu8",", f->nw_ttl);
+    }
+    switch (wc->nw_frag_mask) {
+    case FLOW_NW_FRAG_ANY | FLOW_NW_FRAG_LATER:
+        ds_put_format(s, "nw_frag=%s,",
+                      f->nw_frag & FLOW_NW_FRAG_ANY
+                      ? (f->nw_frag & FLOW_NW_FRAG_LATER ? "later" : "first")
+                      : (f->nw_frag & FLOW_NW_FRAG_LATER ? "<error>" : "no"));
+        break;
+
+    case FLOW_NW_FRAG_ANY:
+        ds_put_format(s, "nw_frag=%s,",
+                      f->nw_frag & FLOW_NW_FRAG_ANY ? "yes" : "no");
+        break;
+
+    case FLOW_NW_FRAG_LATER:
+        ds_put_format(s, "nw_frag=%s,",
+                      f->nw_frag & FLOW_NW_FRAG_LATER ? "later" : "not_later");
+        break;
+    }
+    if (f->nw_proto == IPPROTO_ICMP) {
+        if (!(w & FWW_TP_SRC)) {
+            ds_put_format(s, "icmp_type=%"PRIu16",", ntohs(f->tp_src));
+        }
+        if (!(w & FWW_TP_DST)) {
+            ds_put_format(s, "icmp_code=%"PRIu16",", ntohs(f->tp_dst));
+        }
+    } else if (f->nw_proto == IPPROTO_ICMPV6) {
+        if (!(w & FWW_TP_SRC)) {
+            ds_put_format(s, "icmp_type=%"PRIu16",", ntohs(f->tp_src));
+        }
+        if (!(w & FWW_TP_DST)) {
+            ds_put_format(s, "icmp_code=%"PRIu16",", ntohs(f->tp_dst));
+        }
+        if (!(w & FWW_ND_TARGET)) {
+            ds_put_cstr(s, "nd_target=");
+            print_ipv6_addr(s, &f->nd_target);
+            ds_put_char(s, ',');
+        }
+        if (!(w & FWW_ARP_SHA)) {
+            ds_put_format(s, "nd_sll="ETH_ADDR_FMT",",
+                    ETH_ADDR_ARGS(f->arp_sha));
+        }
+        if (!(w & FWW_ARP_THA)) {
+            ds_put_format(s, "nd_tll="ETH_ADDR_FMT",",
+                    ETH_ADDR_ARGS(f->arp_tha));
+        }
+   } else {
+        if (!(w & FWW_TP_SRC)) {
+            ds_put_format(s, "tp_src=%"PRIu16",", ntohs(f->tp_src));
+        }
+        if (!(w & FWW_TP_DST)) {
+            ds_put_format(s, "tp_dst=%"PRIu16",", ntohs(f->tp_dst));
+        }
+    }
+
+    if (s->length > start_len && ds_last(s) == ',') {
+        s->length--;
+    }
 }
 
 /* Converts 'rule' to a string and returns the string.  The caller must free
@@ -312,22 +683,16 @@ char *
 cls_rule_to_string(const struct cls_rule *rule)
 {
     struct ds s = DS_EMPTY_INITIALIZER;
-    ds_put_format(&s, "wildcards=%x priority=%u ",
-                  rule->wc.wildcards, rule->priority);
-    flow_format(&s, &rule->flow);
-    return ds_cstr(&s);
+    cls_rule_format(rule, &s);
+    return ds_steal_cstr(&s);
 }
 
-/* Prints cls_rule 'rule', for debugging.
- *
- * (The output could be improved and expanded, but this was good enough to
- * debug the classifier.) */
 void
 cls_rule_print(const struct cls_rule *rule)
 {
-    printf("wildcards=%x priority=%u ", rule->wc.wildcards, rule->priority);
-    flow_print(stdout, &rule->flow);
-    putc('\n', stdout);
+    char *s = cls_rule_to_string(rule);
+    puts(s);
+    free(s);
 }
 
 /* Initializes 'cls' as a classifier that initially contains no classification
@@ -383,7 +748,7 @@ classifier_count(const struct classifier *cls)
  * rule, even rules that cannot have any effect because the new rule matches a
  * superset of their flows and has higher priority. */
 struct cls_rule *
-classifier_insert(struct classifier *cls, struct cls_rule *rule)
+classifier_replace(struct classifier *cls, struct cls_rule *rule)
 {
     struct cls_rule *old_rule;
     struct cls_table *table;
@@ -401,6 +766,19 @@ classifier_insert(struct classifier *cls, struct cls_rule *rule)
     return old_rule;
 }
 
+/* Inserts 'rule' into 'cls'.  Until 'rule' is removed from 'cls', the caller
+ * must not modify or free it.
+ *
+ * 'cls' must not contain an identical rule (including wildcards, values of
+ * fixed fields, and priority).  Use classifier_find_rule_exactly() to find
+ * such a rule. */
+void
+classifier_insert(struct classifier *cls, struct cls_rule *rule)
+{
+    struct cls_rule *displaced_rule = classifier_replace(cls, rule);
+    assert(!displaced_rule);
+}
+
 /* Removes 'rule' from 'cls'.  It is the caller's responsibility to free
  * 'rule', if this is desirable. */
 void
@@ -423,7 +801,7 @@ classifier_remove(struct classifier *cls, struct cls_rule *rule)
         hmap_replace(&table->rules, &rule->hmap_node, &next->hmap_node);
     }
 
-    if (--table->n_table_rules == 0 && !table->n_refs) {
+    if (--table->n_table_rules == 0) {
         destroy_table(cls, table);
     }
 
@@ -451,10 +829,7 @@ classifier_lookup(const struct classifier *cls, const struct flow *flow)
 
 /* Finds and returns a rule in 'cls' with exactly the same priority and
  * matching criteria as 'target'.  Returns a null pointer if 'cls' doesn't
- * contain an exact match.
- *
- * Priority is ignored for exact-match rules (because OpenFlow 1.0 always
- * treats exact-match rules as highest priority). */
+ * contain an exact match. */
 struct cls_rule *
 classifier_find_rule_exactly(const struct classifier *cls,
                              const struct cls_rule *target)
@@ -468,9 +843,6 @@ classifier_find_rule_exactly(const struct classifier *cls,
     }
 
     head = find_equal(table, &target->flow, flow_hash(&target->flow, 0));
-    if (!target->wc.wildcards) {
-        return head;
-    }
     FOR_EACH_RULE_IN_LIST (rule, head) {
         if (target->priority >= rule->priority) {
             return target->priority == rule->priority ? rule : NULL;
@@ -507,107 +879,6 @@ classifier_rule_overlaps(const struct classifier *cls,
 
     return false;
 }
-
-/* Searches 'cls' for rules that exactly match 'target' or are more specific
- * than 'target'.  That is, a given 'rule' matches 'target' if, for every
- * field:
- *
- *   - 'target' and 'rule' specify the same (non-wildcarded) value for the
- *     field, or
- *
- *   - 'target' wildcards the field,
- *
- * but not if:
- *
- *   - 'target' and 'rule' specify different values for the field, or
- *
- *   - 'target' specifies a value for the field but 'rule' wildcards it.
- *
- * Equivalently, the truth table for whether a field matches is:
- *
- *                                     rule
- *
- *                             wildcard    exact
- *                            +---------+---------+
- *                   t   wild |   yes   |   yes   |
- *                   a   card |         |         |
- *                   r        +---------+---------+
- *                   g  exact |    no   |if values|
- *                   e        |         |are equal|
- *                   t        +---------+---------+
- *
- * This is the matching rule used by OpenFlow 1.0 non-strict OFPT_FLOW_MOD
- * commands and by OpenFlow 1.0 aggregate and flow stats.
- *
- * Ignores target->priority.
- *
- * 'callback' is allowed to delete the rule that is passed as its argument, but
- * it must not delete (or move) any other rules in 'cls' that have the same
- * wildcards as the argument rule. */
-void
-classifier_for_each_match(const struct classifier *cls_,
-                          const struct cls_rule *target,
-                          cls_cb_func *callback, void *aux)
-{
-    struct classifier *cls = (struct classifier *) cls_;
-    struct cls_table *table, *next_table;
-
-    for (table = classifier_first_table(cls); table; table = next_table) {
-        if (!flow_wildcards_has_extra(&table->wc, &target->wc)) {
-            /* We have eliminated the "no" case in the truth table above.  Two
-             * of the three remaining cases are trivial.  We only need to check
-             * the fourth case, where both 'rule' and 'target' require an exact
-             * match. */
-            struct cls_rule *head, *next_head;
-
-            table->n_refs++;
-            HMAP_FOR_EACH_SAFE (head, next_head, hmap_node, &table->rules) {
-                if (flow_equal_except(&head->flow, &target->flow,
-                                      &target->wc)) {
-                    struct cls_rule *rule, *next_rule;
-
-                    FOR_EACH_RULE_IN_LIST_SAFE (rule, next_rule, head) {
-                        callback(rule, aux);
-                    }
-                }
-            }
-            next_table = classifier_next_table(cls, table);
-            if (!--table->n_refs && !table->n_table_rules) {
-                destroy_table(cls, table);
-            }
-        } else {
-            next_table = classifier_next_table(cls, table);
-        }
-    }
-}
-
-/* 'callback' is allowed to delete the rule that is passed as its argument, but
- * it must not delete (or move) any other rules in 'cls' that have the same
- * wildcards as the argument rule. */
-void
-classifier_for_each(const struct classifier *cls_,
-                    cls_cb_func *callback, void *aux)
-{
-    struct classifier *cls = (struct classifier *) cls_;
-    struct cls_table *table, *next_table;
-
-    for (table = classifier_first_table(cls); table; table = next_table) {
-        struct cls_rule *head, *next_head;
-
-        table->n_refs++;
-        HMAP_FOR_EACH_SAFE (head, next_head, hmap_node, &table->rules) {
-            struct cls_rule *rule, *next_rule;
-
-            FOR_EACH_RULE_IN_LIST_SAFE (rule, next_rule, head) {
-                callback(rule, aux);
-            }
-        }
-        next_table = classifier_next_table(cls, table);
-        if (!--table->n_refs && !table->n_table_rules) {
-            destroy_table(cls, table);
-        }
-    }
-}
 
 /* Iteration. */
 
@@ -682,8 +953,7 @@ cls_cursor_first(struct cls_cursor *cursor)
 {
     struct cls_table *table;
 
-    for (table = classifier_first_table(cursor->cls); table;
-         table = classifier_next_table(cursor->cls, table)) {
+    HMAP_FOR_EACH (table, hmap_node, &cursor->cls->tables) {
         struct cls_rule *rule = search_table(table, cursor->target);
         if (rule) {
             cursor->table = table;
@@ -702,19 +972,23 @@ cls_cursor_next(struct cls_cursor *cursor, struct cls_rule *rule)
     const struct cls_table *table;
     struct cls_rule *next;
 
-    next = next_rule_in_list(rule);
-    if (next) {
+    next = next_rule_in_list__(rule);
+    if (next->priority < rule->priority) {
         return next;
     }
 
+    /* 'next' is the head of the list, that is, the rule that is included in
+     * the table's hmap.  (This is important when the classifier contains rules
+     * that differ only in priority.) */
+    rule = next;
     HMAP_FOR_EACH_CONTINUE (rule, hmap_node, &cursor->table->rules) {
         if (rule_matches(rule, cursor->target)) {
             return rule;
         }
     }
 
-    for (table = classifier_next_table(cursor->cls, cursor->table); table;
-         table = classifier_next_table(cursor->cls, table)) {
+    table = cursor->table;
+    HMAP_FOR_EACH_CONTINUE (table, hmap_node, &cursor->cls->tables) {
         rule = search_table(table, cursor->target);
         if (rule) {
             cursor->table = table;
@@ -730,7 +1004,7 @@ find_table(const struct classifier *cls, const struct flow_wildcards *wc)
 {
     struct cls_table *table;
 
-    HMAP_FOR_EACH_IN_BUCKET (table, hmap_node, flow_wildcards_hash(wc),
+    HMAP_FOR_EACH_IN_BUCKET (table, hmap_node, flow_wildcards_hash(wc, 0),
                              &cls->tables) {
         if (flow_wildcards_equal(wc, &table->wc)) {
             return table;
@@ -747,25 +1021,11 @@ insert_table(struct classifier *cls, const struct flow_wildcards *wc)
     table = xzalloc(sizeof *table);
     hmap_init(&table->rules);
     table->wc = *wc;
-    hmap_insert(&cls->tables, &table->hmap_node, flow_wildcards_hash(wc));
+    hmap_insert(&cls->tables, &table->hmap_node, flow_wildcards_hash(wc, 0));
 
     return table;
 }
 
-static struct cls_table *
-classifier_first_table(const struct classifier *cls)
-{
-    return cls_table_from_hmap_node(hmap_first(&cls->tables));
-}
-
-static struct cls_table *
-classifier_next_table(const struct classifier *cls,
-                      const struct cls_table *table)
-{
-    return cls_table_from_hmap_node(hmap_next(&cls->tables,
-                                              &table->hmap_node));
-}
-
 static void
 destroy_table(struct classifier *cls, struct cls_table *table)
 {
@@ -781,7 +1041,7 @@ find_match(const struct cls_table *table, const struct flow *flow)
     struct flow f;
 
     f = *flow;
-    zero_wildcards(&f, &table->wc);
+    flow_zero_wildcards(&f, &table->wc);
     HMAP_FOR_EACH_WITH_HASH (rule, hmap_node, flow_hash(&f, 0),
                              &table->rules) {
         if (flow_equal(&f, &rule->flow)) {
@@ -845,20 +1105,51 @@ insert_rule(struct cls_table *table, struct cls_rule *new)
 }
 
 static struct cls_rule *
-next_rule_in_list(struct cls_rule *rule)
+next_rule_in_list__(struct cls_rule *rule)
 {
     struct cls_rule *next = OBJECT_CONTAINING(rule->list.next, next, list);
+    return next;
+}
+
+static struct cls_rule *
+next_rule_in_list(struct cls_rule *rule)
+{
+    struct cls_rule *next = next_rule_in_list__(rule);
     return next->priority < rule->priority ? next : NULL;
 }
 
+static bool
+ipv6_equal_except(const struct in6_addr *a, const struct in6_addr *b,
+                  const struct in6_addr *mask)
+{
+    int i;
+
+#ifdef s6_addr32
+    for (i=0; i<4; i++) {
+        if ((a->s6_addr32[i] ^ b->s6_addr32[i]) & mask->s6_addr32[i]) {
+            return false;
+        }
+    }
+#else
+    for (i=0; i<16; i++) {
+        if ((a->s6_addr[i] ^ b->s6_addr[i]) & mask->s6_addr[i]) {
+            return false;
+        }
+    }
+#endif
+
+    return true;
+}
+
+
 static bool
 flow_equal_except(const struct flow *a, const struct flow *b,
                   const struct flow_wildcards *wildcards)
 {
-    const uint32_t wc = wildcards->wildcards;
+    const flow_wildcards_t wc = wildcards->wildcards;
     int i;
 
-    BUILD_ASSERT_DECL(FLOW_SIG_SIZE == 37 + FLOW_N_REGS * 4);
+    BUILD_ASSERT_DECL(FLOW_WC_SEQ == 7);
 
     for (i = 0; i < FLOW_N_REGS; i++) {
         if ((a->regs[i] ^ b->regs[i]) & wildcards->reg_masks[i]) {
@@ -866,76 +1157,36 @@ flow_equal_except(const struct flow *a, const struct flow *b,
         }
     }
 
-    return ((wc & NXFW_TUN_ID || a->tun_id == b->tun_id)
+    return (!((a->tun_id ^ b->tun_id) & wildcards->tun_id_mask)
             && !((a->nw_src ^ b->nw_src) & wildcards->nw_src_mask)
             && !((a->nw_dst ^ b->nw_dst) & wildcards->nw_dst_mask)
-            && (wc & OFPFW_IN_PORT || a->in_port == b->in_port)
-            && (wc & OFPFW_DL_VLAN || a->dl_vlan == b->dl_vlan)
-            && (wc & OFPFW_DL_TYPE || a->dl_type == b->dl_type)
-            && (wc & OFPFW_TP_SRC || a->tp_src == b->tp_src)
-            && (wc & OFPFW_TP_DST || a->tp_dst == b->tp_dst)
-            && (wc & OFPFW_DL_SRC || eth_addr_equals(a->dl_src, b->dl_src))
-            && (wc & OFPFW_DL_DST
+            && (wc & FWW_IN_PORT || a->in_port == b->in_port)
+            && !((a->vlan_tci ^ b->vlan_tci) & wildcards->vlan_tci_mask)
+            && (wc & FWW_DL_TYPE || a->dl_type == b->dl_type)
+            && (wc & FWW_TP_SRC || a->tp_src == b->tp_src)
+            && (wc & FWW_TP_DST || a->tp_dst == b->tp_dst)
+            && (wc & FWW_DL_SRC || eth_addr_equals(a->dl_src, b->dl_src))
+            && (wc & FWW_DL_DST
                 || (!((a->dl_dst[0] ^ b->dl_dst[0]) & 0xfe)
                     && a->dl_dst[1] == b->dl_dst[1]
                     && a->dl_dst[2] == b->dl_dst[2]
                     && a->dl_dst[3] == b->dl_dst[3]
                     && a->dl_dst[4] == b->dl_dst[4]
                     && a->dl_dst[5] == b->dl_dst[5]))
-            && (wc & FWW_ETH_MCAST || !((a->dl_dst[0] ^ b->dl_dst[0]) & 0x01))
-            && (wc & OFPFW_NW_PROTO || a->nw_proto == b->nw_proto)
-            && (wc & OFPFW_DL_VLAN_PCP || a->dl_vlan_pcp == b->dl_vlan_pcp)
-            && (wc & OFPFW_NW_TOS || a->nw_tos == b->nw_tos));
-}
-
-static void
-zero_wildcards(struct flow *flow, const struct flow_wildcards *wildcards)
-{
-    const uint32_t wc = wildcards->wildcards;
-    int i;
-
-    BUILD_ASSERT_DECL(FLOW_SIG_SIZE == 37 + 4 * FLOW_N_REGS);
-
-    for (i = 0; i < FLOW_N_REGS; i++) {
-        flow->regs[i] &= wildcards->reg_masks[i];
-    }
-    if (wc & NXFW_TUN_ID) {
-        flow->tun_id = 0;
-    }
-    flow->nw_src &= wildcards->nw_src_mask;
-    flow->nw_dst &= wildcards->nw_dst_mask;
-    if (wc & OFPFW_IN_PORT) {
-        flow->in_port = 0;
-    }
-    if (wc & OFPFW_DL_VLAN) {
-        flow->dl_vlan = 0;
-    }
-    if (wc & OFPFW_DL_TYPE) {
-        flow->dl_type = 0;
-    }
-    if (wc & OFPFW_TP_SRC) {
-        flow->tp_src = 0;
-    }
-    if (wc & OFPFW_TP_DST) {
-        flow->tp_dst = 0;
-    }
-    if (wc & OFPFW_DL_SRC) {
-        memset(flow->dl_src, 0, sizeof flow->dl_src);
-    }
-    if (wc & OFPFW_DL_DST) {
-        flow->dl_dst[0] &= 0x01;
-        memset(&flow->dl_dst[1], 0, 5);
-    }
-    if (wc & FWW_ETH_MCAST) {
-        flow->dl_dst[0] &= 0xfe;
-    }
-    if (wc & OFPFW_NW_PROTO) {
-        flow->nw_proto = 0;
-    }
-    if (wc & OFPFW_DL_VLAN_PCP) {
-        flow->dl_vlan_pcp = 0;
-    }
-    if (wc & OFPFW_NW_TOS) {
-        flow->nw_tos = 0;
-    }
+            && (wc & FWW_ETH_MCAST
+                || !((a->dl_dst[0] ^ b->dl_dst[0]) & 0x01))
+            && (wc & FWW_NW_PROTO || a->nw_proto == b->nw_proto)
+            && (wc & FWW_NW_TTL || a->nw_ttl == b->nw_ttl)
+            && (wc & FWW_NW_DSCP || !((a->nw_tos ^ b->nw_tos) & IP_DSCP_MASK))
+            && (wc & FWW_NW_ECN || !((a->nw_tos ^ b->nw_tos) & IP_ECN_MASK))
+            && !((a->nw_frag ^ b->nw_frag) & wildcards->nw_frag_mask)
+            && (wc & FWW_ARP_SHA || eth_addr_equals(a->arp_sha, b->arp_sha))
+            && (wc & FWW_ARP_THA || eth_addr_equals(a->arp_tha, b->arp_tha))
+            && (wc & FWW_IPV6_LABEL || a->ipv6_label == b->ipv6_label)
+            && ipv6_equal_except(&a->ipv6_src, &b->ipv6_src,
+                    &wildcards->ipv6_src_mask)
+            && ipv6_equal_except(&a->ipv6_dst, &b->ipv6_dst,
+                    &wildcards->ipv6_dst_mask)
+            && (wc & FWW_ND_TARGET
+                || ipv6_addr_equals(&a->nd_target, &b->nd_target)));
 }