2 * Copyright (c) 2009, 2010, 2011 Nicira Networks.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 #define CLASSIFIER_H 1
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.
32 #include "openflow/nicira-ext.h"
33 #include "openflow/openflow.h"
39 /* A flow classifier. */
41 int n_rules; /* Total number of rules. */
42 struct hmap tables; /* Contains "struct cls_table"s. */
45 /* A set of rules that all have the same fields wildcarded. */
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. */
53 /* Returns true if 'table' is a "catch-all" table that will match every
54 * packet (if there is no higher-priority match). */
56 cls_table_is_catchall(const struct cls_table *table)
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));
65 /* A flow classification rule.
67 * Use one of the cls_rule_*() functions to initialize a cls_rule.
69 * The cls_rule_*() functions below maintain the following important
70 * invariant that the classifier depends on:
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.)
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. */
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,
89 void cls_rule_init_catchall(struct cls_rule *, unsigned int priority);
91 void cls_rule_zero_wildcarded_fields(struct cls_rule *);
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 *);
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);
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 *);
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 *);
155 typedef void cls_cb_func(struct cls_rule *, void *aux);
157 struct cls_rule *classifier_find_rule_exactly(const struct classifier *,
158 const struct cls_rule *);
163 const struct classifier *cls;
164 const struct cls_table *table;
165 const struct cls_rule *target;
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 *);
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), \
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), \
191 #endif /* classifier.h */