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 /* A flow classifier. */
  36 struct classifier {
  37     int n_rules;                /* Total number of rules. */
  38     struct hmap tables;         /* Contains "struct cls_table"s.  */
  39 };
  40
  41 /* A set of rules that all have the same fields wildcarded. */
  42 struct cls_table {
  43     struct hmap_node hmap_node; /* Within struct classifier 'wctables'. */
  44     struct hmap rules;          /* Contains "struct cls_rule"s. */
  45     struct flow_wildcards wc;   /* Wildcards for fields. */
  46     int n_table_rules;          /* Number of rules, including duplicates. */
  47 };
  48
  49 /* A flow classification rule.
  50  *
  51  * Use one of the cls_rule_*() functions to initialize a cls_rule.
  52  *
  53  * The cls_rule_*() functions below maintain the following important
  54  * invariant that the classifier depends on:
  55  *
  56  *   - If a bit or a field is wildcarded in 'wc', then the corresponding bit or
  57  *     field in 'flow' is set to all-0-bits.  (The
  58  *     cls_rule_zero_wildcarded_fields() function can be used to restore this
  59  *     invariant after adding wildcards.)
  60  */
  61 struct cls_rule {
  62     struct hmap_node hmap_node; /* Within struct cls_table 'rules'. */
  63     struct list list;           /* List of identical, lower-priority rules. */
  64     struct flow flow;           /* All field values. */
  65     struct flow_wildcards wc;   /* Wildcards for fields. */
  66     unsigned int priority;      /* Larger numbers are higher priorities. */
  67 };
  68
  69 void cls_rule_init(const struct flow *, const struct flow_wildcards *,
  70                    unsigned int priority, struct cls_rule *);
  71 void cls_rule_init_exact(const struct flow *, unsigned int priority,
  72                          struct cls_rule *);
  73 void cls_rule_init_catchall(struct cls_rule *, unsigned int priority);
  74
  75 void cls_rule_zero_wildcarded_fields(struct cls_rule *);
  76
  77 void cls_rule_set_reg(struct cls_rule *, unsigned int reg_idx, uint32_t value);
  78 void cls_rule_set_reg_masked(struct cls_rule *, unsigned int reg_idx,
  79                              uint32_t value, uint32_t mask);
  80 void cls_rule_set_tun_id(struct cls_rule *, ovs_be64 tun_id);
  81 void cls_rule_set_tun_id_masked(struct cls_rule *,
  82                                 ovs_be64 tun_id, ovs_be64 mask);
  83 void cls_rule_set_in_port(struct cls_rule *, uint16_t odp_port);
  84 void cls_rule_set_dl_type(struct cls_rule *, ovs_be16);
  85 void cls_rule_set_dl_src(struct cls_rule *, const uint8_t[6]);
  86 void cls_rule_set_dl_dst(struct cls_rule *, const uint8_t[6]);
  87 void cls_rule_set_dl_tci(struct cls_rule *, ovs_be16 tci);
  88 void cls_rule_set_dl_tci_masked(struct cls_rule *,
  89                                 ovs_be16 tci, ovs_be16 mask);
  90 void cls_rule_set_any_vid(struct cls_rule *);
  91 void cls_rule_set_dl_vlan(struct cls_rule *, ovs_be16);
  92 void cls_rule_set_any_pcp(struct cls_rule *);
  93 void cls_rule_set_dl_vlan_pcp(struct cls_rule *, uint8_t);
  94 void cls_rule_set_tp_src(struct cls_rule *, ovs_be16);
  95 void cls_rule_set_tp_dst(struct cls_rule *, ovs_be16);
  96 void cls_rule_set_nw_proto(struct cls_rule *, uint8_t);
  97 void cls_rule_set_nw_src(struct cls_rule *, ovs_be32);
  98 bool cls_rule_set_nw_src_masked(struct cls_rule *, ovs_be32 ip, ovs_be32 mask);
  99 void cls_rule_set_nw_dst(struct cls_rule *, ovs_be32);
 100 bool cls_rule_set_nw_dst_masked(struct cls_rule *, ovs_be32 ip, ovs_be32 mask);
 101 void cls_rule_set_nw_tos(struct cls_rule *, uint8_t);
 102 void cls_rule_set_icmp_type(struct cls_rule *, uint8_t);
 103 void cls_rule_set_icmp_code(struct cls_rule *, uint8_t);
 104 void cls_rule_set_arp_sha(struct cls_rule *, const uint8_t[6]);
 105 void cls_rule_set_arp_tha(struct cls_rule *, const uint8_t[6]);
 106 void cls_rule_set_ipv6_src(struct cls_rule *, const struct in6_addr *);
 107 bool cls_rule_set_ipv6_src_masked(struct cls_rule *, const struct in6_addr *,
 108                                   const struct in6_addr *);
 109 void cls_rule_set_ipv6_dst(struct cls_rule *, const struct in6_addr *);
 110 bool cls_rule_set_ipv6_dst_masked(struct cls_rule *, const struct in6_addr *,
 111                                   const struct in6_addr *);
 112 void cls_rule_set_nd_target(struct cls_rule *, const struct in6_addr);
 113
 114 bool cls_rule_equal(const struct cls_rule *, const struct cls_rule *);
 115
 116 void cls_rule_format(const struct cls_rule *, struct ds *);
 117 char *cls_rule_to_string(const struct cls_rule *);
 118 void cls_rule_print(const struct cls_rule *);
 119
 120 void classifier_init(struct classifier *);
 121 void classifier_destroy(struct classifier *);
 122 bool classifier_is_empty(const struct classifier *);
 123 int classifier_count(const struct classifier *);
 124 void classifier_insert(struct classifier *, struct cls_rule *);
 125 struct cls_rule *classifier_replace(struct classifier *, struct cls_rule *);
 126 void classifier_remove(struct classifier *, struct cls_rule *);
 127 struct cls_rule *classifier_lookup(const struct classifier *,
 128                                    const struct flow *);
 129 bool classifier_rule_overlaps(const struct classifier *,
 130                               const struct cls_rule *);
 131
 132 typedef void cls_cb_func(struct cls_rule *, void *aux);
 133
 134 struct cls_rule *classifier_find_rule_exactly(const struct classifier *,
 135                                               const struct cls_rule *);
 136 \f
 137 /* Iteration. */
 138
 139 struct cls_cursor {
 140     const struct classifier *cls;
 141     const struct cls_table *table;
 142     const struct cls_rule *target;
 143 };
 144
 145 void cls_cursor_init(struct cls_cursor *, const struct classifier *,
 146                      const struct cls_rule *match);
 147 struct cls_rule *cls_cursor_first(struct cls_cursor *);
 148 struct cls_rule *cls_cursor_next(struct cls_cursor *, struct cls_rule *);
 149
 150 #define CLS_CURSOR_FOR_EACH(RULE, MEMBER, CURSOR)                       \
 151     for (ASSIGN_CONTAINER(RULE, cls_cursor_first(CURSOR), MEMBER);      \
 152          &(RULE)->MEMBER != NULL;                                       \
 153          ASSIGN_CONTAINER(RULE, cls_cursor_next(CURSOR, &(RULE)->MEMBER), \
 154                           MEMBER))
 155
 156 #define CLS_CURSOR_FOR_EACH_SAFE(RULE, NEXT, MEMBER, CURSOR)            \
 157     for (ASSIGN_CONTAINER(RULE, cls_cursor_first(CURSOR), MEMBER);      \
 158          (&(RULE)->MEMBER != NULL                                       \
 159           ? ASSIGN_CONTAINER(NEXT, cls_cursor_next(CURSOR, &(RULE)->MEMBER), \
 160                              MEMBER)                                    \
 161           : 0);                                                         \
 162          (RULE) = (NEXT))
 163
 164 #endif /* classifier.h */