lib/classifier.h

   1 /*
   2  * Copyright (c) 2009, 2010, 2011 Nicira Networks.
   3  *
   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:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  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.
  15  */
  16
  17 #ifndef CLASSIFIER_H
  18 #define CLASSIFIER_H 1
  19
  20 /* Flow classifier.
  21  *
  22  * A classifier is a "struct classifier",
  23  *      a hash map from a set of wildcards to a "struct cls_table",
  24  *              a hash map from fixed field values to "struct cls_rule",
  25  *                      which can contain a list of otherwise identical rules
  26  *                      with lower priorities.
  27  */
  28
  29 #include "flow.h"
  30 #include "hmap.h"
  31 #include "list.h"
  32 #include "openflow/nicira-ext.h"
  33 #include "openflow/openflow.h"
  34
  35 #ifdef __cplusplus
  36 extern "C" {
  37 #endif
  38
  39 /* A flow classifier. */
  40 struct classifier {
  41     int n_rules;                /* Total number of rules. */
  42     struct hmap tables;         /* Contains "struct cls_table"s.  */
  43 };
  44
  45 /* A set of rules that all have the same fields wildcarded. */
  46 struct cls_table {
  47     struct hmap_node hmap_node; /* Within struct classifier 'tables' hmap. */
  48     struct hmap rules;          /* Contains "struct cls_rule"s. */
  49     struct flow_wildcards wc;   /* Wildcards for fields. */
  50     int n_table_rules;          /* Number of rules, including duplicates. */
  51 };
  52
  53 /* Returns true if 'table' is a "catch-all" table that will match every
  54  * packet (if there is no higher-priority match). */
  55 static inline bool
  56 cls_table_is_catchall(const struct cls_table *table)
  57 {
  58     /* A catch-all table can only have one rule, so use hmap_count() as a cheap
  59      * check to rule out other kinds of match before doing the full check with
  60      * flow_wildcards_is_catchall(). */
  61     return (hmap_count(&table->rules) == 1
  62             && flow_wildcards_is_catchall(&table->wc));
  63 }
  64
  65 /* A flow classification rule.
  66  *
  67  * Use one of the cls_rule_*() functions to initialize a cls_rule.
  68  *
  69  * The cls_rule_*() functions below maintain the following important
  70  * invariant that the classifier depends on:
  71  *
  72  *   - If a bit or a field is wildcarded in 'wc', then the corresponding bit or
  73  *     field in 'flow' is set to all-0-bits.  (The
  74  *     cls_rule_zero_wildcarded_fields() function can be used to restore this
  75  *     invariant after adding wildcards.)
  76  */
  77 struct cls_rule {
  78     struct hmap_node hmap_node; /* Within struct cls_table 'rules'. */
  79     struct list list;           /* List of identical, lower-priority rules. */
  80     struct flow flow;           /* All field values. */
  81     struct flow_wildcards wc;   /* Wildcards for fields. */
  82     unsigned int priority;      /* Larger numbers are higher priorities. */
  83 };
  84
  85 void cls_rule_init(const struct flow *, const struct flow_wildcards *,
  86                    unsigned int priority, struct cls_rule *);
  87 void cls_rule_init_exact(const struct flow *, unsigned int priority,
  88                          struct cls_rule *);
  89 void cls_rule_init_catchall(struct cls_rule *, unsigned int priority);
  90
  91 void cls_rule_zero_wildcarded_fields(struct cls_rule *);
  92
  93 void cls_rule_set_reg(struct cls_rule *, unsigned int reg_idx, uint32_t value);
  94 void cls_rule_set_reg_masked(struct cls_rule *, unsigned int reg_idx,
  95                              uint32_t value, uint32_t mask);
  96 void cls_rule_set_tun_id(struct cls_rule *, ovs_be64 tun_id);
  97 void cls_rule_set_tun_id_masked(struct cls_rule *,
  98                                 ovs_be64 tun_id, ovs_be64 mask);
  99 void cls_rule_set_in_port(struct cls_rule *, uint16_t odp_port);
 100 void cls_rule_set_dl_type(struct cls_rule *, ovs_be16);
 101 void cls_rule_set_dl_src(struct cls_rule *, const uint8_t[6]);
 102 void cls_rule_set_dl_dst(struct cls_rule *, const uint8_t[6]);
 103 void cls_rule_set_dl_dst_masked(struct cls_rule *, const uint8_t dl_dst[6],
 104                                 const uint8_t mask[6]);
 105 void cls_rule_set_dl_tci(struct cls_rule *, ovs_be16 tci);
 106 void cls_rule_set_dl_tci_masked(struct cls_rule *,
 107                                 ovs_be16 tci, ovs_be16 mask);
 108 void cls_rule_set_any_vid(struct cls_rule *);
 109 void cls_rule_set_dl_vlan(struct cls_rule *, ovs_be16);
 110 void cls_rule_set_any_pcp(struct cls_rule *);
 111 void cls_rule_set_dl_vlan_pcp(struct cls_rule *, uint8_t);
 112 void cls_rule_set_tp_src(struct cls_rule *, ovs_be16);
 113 void cls_rule_set_tp_dst(struct cls_rule *, ovs_be16);
 114 void cls_rule_set_nw_proto(struct cls_rule *, uint8_t);
 115 void cls_rule_set_nw_src(struct cls_rule *, ovs_be32);
 116 bool cls_rule_set_nw_src_masked(struct cls_rule *, ovs_be32 ip, ovs_be32 mask);
 117 void cls_rule_set_nw_dst(struct cls_rule *, ovs_be32);
 118 bool cls_rule_set_nw_dst_masked(struct cls_rule *, ovs_be32 ip, ovs_be32 mask);
 119 void cls_rule_set_nw_dscp(struct cls_rule *, uint8_t);
 120 void cls_rule_set_nw_ecn(struct cls_rule *, uint8_t);
 121 void cls_rule_set_frag(struct cls_rule *, uint8_t frag);
 122 void cls_rule_set_frag_masked(struct cls_rule *, uint8_t frag, uint8_t mask);
 123 void cls_rule_set_icmp_type(struct cls_rule *, uint8_t);
 124 void cls_rule_set_icmp_code(struct cls_rule *, uint8_t);
 125 void cls_rule_set_arp_sha(struct cls_rule *, const uint8_t[6]);
 126 void cls_rule_set_arp_tha(struct cls_rule *, const uint8_t[6]);
 127 void cls_rule_set_ipv6_src(struct cls_rule *, const struct in6_addr *);
 128 bool cls_rule_set_ipv6_src_masked(struct cls_rule *, const struct in6_addr *,
 129                                   const struct in6_addr *);
 130 void cls_rule_set_ipv6_dst(struct cls_rule *, const struct in6_addr *);
 131 bool cls_rule_set_ipv6_dst_masked(struct cls_rule *, const struct in6_addr *,
 132                                   const struct in6_addr *);
 133 void cls_rule_set_ipv6_label(struct cls_rule *, ovs_be32);
 134 void cls_rule_set_nd_target(struct cls_rule *, const struct in6_addr *);
 135
 136 bool cls_rule_equal(const struct cls_rule *, const struct cls_rule *);
 137 uint32_t cls_rule_hash(const struct cls_rule *, uint32_t basis);
 138
 139 void cls_rule_format(const struct cls_rule *, struct ds *);
 140 char *cls_rule_to_string(const struct cls_rule *);
 141 void cls_rule_print(const struct cls_rule *);
 142
 143 void classifier_init(struct classifier *);
 144 void classifier_destroy(struct classifier *);
 145 bool classifier_is_empty(const struct classifier *);
 146 int classifier_count(const struct classifier *);
 147 void classifier_insert(struct classifier *, struct cls_rule *);
 148 struct cls_rule *classifier_replace(struct classifier *, struct cls_rule *);
 149 void classifier_remove(struct classifier *, struct cls_rule *);
 150 struct cls_rule *classifier_lookup(const struct classifier *,
 151                                    const struct flow *);
 152 bool classifier_rule_overlaps(const struct classifier *,
 153                               const struct cls_rule *);
 154
 155 typedef void cls_cb_func(struct cls_rule *, void *aux);
 156
 157 struct cls_rule *classifier_find_rule_exactly(const struct classifier *,
 158                                               const struct cls_rule *);
 159 \f
 160 /* Iteration. */
 161
 162 struct cls_cursor {
 163     const struct classifier *cls;
 164     const struct cls_table *table;
 165     const struct cls_rule *target;
 166 };
 167
 168 void cls_cursor_init(struct cls_cursor *, const struct classifier *,
 169                      const struct cls_rule *match);
 170 struct cls_rule *cls_cursor_first(struct cls_cursor *);
 171 struct cls_rule *cls_cursor_next(struct cls_cursor *, struct cls_rule *);
 172
 173 #define CLS_CURSOR_FOR_EACH(RULE, MEMBER, CURSOR)                       \
 174     for (ASSIGN_CONTAINER(RULE, cls_cursor_first(CURSOR), MEMBER);      \
 175          &(RULE)->MEMBER != NULL;                                       \
 176          ASSIGN_CONTAINER(RULE, cls_cursor_next(CURSOR, &(RULE)->MEMBER), \
 177                           MEMBER))
 178
 179 #define CLS_CURSOR_FOR_EACH_SAFE(RULE, NEXT, MEMBER, CURSOR)            \
 180     for (ASSIGN_CONTAINER(RULE, cls_cursor_first(CURSOR), MEMBER);      \
 181          (&(RULE)->MEMBER != NULL                                       \
 182           ? ASSIGN_CONTAINER(NEXT, cls_cursor_next(CURSOR, &(RULE)->MEMBER), \
 183                              MEMBER)                                    \
 184           : 0);                                                         \
 185          (RULE) = (NEXT))
 186
 187 #ifdef __cplusplus
 188 }
 189 #endif
 190
 191 #endif /* classifier.h */