2 * Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc.
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.
19 #include <sys/types.h>
20 #include <netinet/in.h>
24 #include "openflow/nicira-ext.h"
25 #include "openflow/openflow.h"
29 struct dpif_flow_stats;
31 struct flow_wildcards;
36 /* This sequence number should be incremented whenever anything involving flows
37 * or the wildcarding of flows changes. This will cause build assertion
38 * failures in places which likely need to be updated. */
39 #define FLOW_WC_SEQ 17
42 BUILD_ASSERT_DECL(FLOW_N_REGS <= NXM_NX_MAX_REGS);
44 /* Used for struct flow's dl_type member for frames that have no Ethernet
45 * type, that is, pure 802.2 frames. */
46 #define FLOW_DL_TYPE_NONE 0x5ff
48 /* Fragment bits, used for IPv4 and IPv6, always zero for non-IP flows. */
49 #define FLOW_NW_FRAG_ANY (1 << 0) /* Set for any IP frag. */
50 #define FLOW_NW_FRAG_LATER (1 << 1) /* Set for IP frag with nonzero offset. */
51 #define FLOW_NW_FRAG_MASK (FLOW_NW_FRAG_ANY | FLOW_NW_FRAG_LATER)
53 BUILD_ASSERT_DECL(FLOW_NW_FRAG_ANY == NX_IP_FRAG_ANY);
54 BUILD_ASSERT_DECL(FLOW_NW_FRAG_LATER == NX_IP_FRAG_LATER);
56 #define FLOW_TNL_F_DONT_FRAGMENT (1 << 0)
57 #define FLOW_TNL_F_CSUM (1 << 1)
58 #define FLOW_TNL_F_KEY (1 << 2)
69 * A flow in the network.
71 * The meaning of 'in_port' is context-dependent. In most cases, it is a
72 * 16-bit OpenFlow 1.0 port number. In the software datapath interface (dpif)
73 * layer and its implementations (e.g. dpif-linux, dpif-netdev), it is instead
74 * a 32-bit datapath port number.
77 struct flow_tnl tunnel; /* Encapsulating tunnel parameters. */
78 ovs_be64 metadata; /* OpenFlow Metadata. */
79 struct in6_addr ipv6_src; /* IPv6 source address. */
80 struct in6_addr ipv6_dst; /* IPv6 destination address. */
81 struct in6_addr nd_target; /* IPv6 neighbor discovery (ND) target. */
82 uint32_t skb_priority; /* Packet priority for QoS. */
83 uint32_t regs[FLOW_N_REGS]; /* Registers. */
84 ovs_be32 nw_src; /* IPv4 source address. */
85 ovs_be32 nw_dst; /* IPv4 destination address. */
86 ovs_be32 ipv6_label; /* IPv6 flow label. */
87 uint32_t in_port; /* Input port. OpenFlow port number
88 unless in DPIF code, in which case it
89 is the datapath port number. */
90 ovs_be16 vlan_tci; /* If 802.1Q, TCI | VLAN_CFI; otherwise 0. */
91 ovs_be16 dl_type; /* Ethernet frame type. */
92 ovs_be16 tp_src; /* TCP/UDP source port. */
93 ovs_be16 tp_dst; /* TCP/UDP destination port. */
94 uint8_t dl_src[6]; /* Ethernet source address. */
95 uint8_t dl_dst[6]; /* Ethernet destination address. */
96 uint8_t nw_proto; /* IP protocol or low 8 bits of ARP opcode. */
97 uint8_t nw_tos; /* IP ToS (including DSCP and ECN). */
98 uint8_t arp_sha[6]; /* ARP/ND source hardware address. */
99 uint8_t arp_tha[6]; /* ARP/ND target hardware address. */
100 uint8_t nw_ttl; /* IP TTL/Hop Limit. */
101 uint8_t nw_frag; /* FLOW_FRAG_* flags. */
103 BUILD_ASSERT_DECL(sizeof(struct flow) % 4 == 0);
105 #define FLOW_U32S (sizeof(struct flow) / 4)
107 /* Remember to update FLOW_WC_SEQ when changing 'struct flow'. */
108 BUILD_ASSERT_DECL(sizeof(struct flow) == sizeof(struct flow_tnl) + 144 &&
111 /* Represents the metadata fields of struct flow. */
112 struct flow_metadata {
113 ovs_be64 tun_id; /* Encapsulating tunnel ID. */
114 ovs_be64 metadata; /* OpenFlow 1.1+ metadata field. */
115 uint32_t regs[FLOW_N_REGS]; /* Registers. */
116 uint16_t in_port; /* OpenFlow port or zero. */
119 void flow_extract(struct ofpbuf *, uint32_t priority, const struct flow_tnl *,
120 uint16_t in_port, struct flow *);
121 void flow_zero_wildcards(struct flow *, const struct flow_wildcards *);
122 void flow_get_metadata(const struct flow *, struct flow_metadata *);
124 char *flow_to_string(const struct flow *);
125 void flow_format(struct ds *, const struct flow *);
126 void flow_print(FILE *, const struct flow *);
127 static inline int flow_compare_3way(const struct flow *, const struct flow *);
128 static inline bool flow_equal(const struct flow *, const struct flow *);
129 static inline size_t flow_hash(const struct flow *, uint32_t basis);
131 void flow_set_dl_vlan(struct flow *, ovs_be16 vid);
132 void flow_set_vlan_vid(struct flow *, ovs_be16 vid);
133 void flow_set_vlan_pcp(struct flow *, uint8_t pcp);
135 void flow_compose(struct ofpbuf *, const struct flow *);
138 flow_compare_3way(const struct flow *a, const struct flow *b)
140 return memcmp(a, b, sizeof *a);
144 flow_equal(const struct flow *a, const struct flow *b)
146 return !flow_compare_3way(a, b);
150 flow_hash(const struct flow *flow, uint32_t basis)
152 return hash_words((const uint32_t *) flow, sizeof *flow / 4, basis);
155 uint32_t flow_hash_in_minimask(const struct flow *, const struct minimask *,
158 /* Wildcards for a flow.
160 * A 1-bit in each bit in 'masks' indicates that the corresponding bit of
161 * the flow is significant (must match). A 0-bit indicates that the
162 * corresponding bit of the flow is wildcarded (need not match). */
163 struct flow_wildcards {
167 void flow_wildcards_init_catchall(struct flow_wildcards *);
168 void flow_wildcards_init_exact(struct flow_wildcards *);
170 bool flow_wildcards_is_catchall(const struct flow_wildcards *);
172 void flow_wildcards_set_reg_mask(struct flow_wildcards *,
173 int idx, uint32_t mask);
175 void flow_wildcards_combine(struct flow_wildcards *dst,
176 const struct flow_wildcards *src1,
177 const struct flow_wildcards *src2);
178 bool flow_wildcards_has_extra(const struct flow_wildcards *,
179 const struct flow_wildcards *);
181 uint32_t flow_wildcards_hash(const struct flow_wildcards *, uint32_t basis);
182 bool flow_wildcards_equal(const struct flow_wildcards *,
183 const struct flow_wildcards *);
184 uint32_t flow_hash_symmetric_l4(const struct flow *flow, uint32_t basis);
186 uint32_t flow_hash_fields(const struct flow *, enum nx_hash_fields,
188 const char *flow_hash_fields_to_str(enum nx_hash_fields);
189 bool flow_hash_fields_valid(enum nx_hash_fields);
191 bool flow_equal_except(const struct flow *a, const struct flow *b,
192 const struct flow_wildcards *);
194 /* Compressed flow. */
196 #define MINI_N_INLINE (sizeof(void *) == 4 ? 7 : 8)
197 #define MINI_N_MAPS DIV_ROUND_UP(FLOW_U32S, 32)
199 /* A sparse representation of a "struct flow".
201 * A "struct flow" is fairly large and tends to be mostly zeros. Sparse
202 * representation has two advantages. First, it saves memory. Second, it
203 * saves time when the goal is to iterate over only the nonzero parts of the
206 * The 'map' member holds one bit for each uint32_t in a "struct flow". Each
207 * 0-bit indicates that the corresponding uint32_t is zero, each 1-bit that it
210 * 'values' points to the start of an array that has one element for each 1-bit
211 * in 'map'. The least-numbered 1-bit is in values[0], the next 1-bit is in
212 * values[1], and so on.
214 * 'values' may point to a few different locations:
216 * - If 'map' has MINI_N_INLINE or fewer 1-bits, it may point to
217 * 'inline_values'. One hopes that this is the common case.
219 * - If 'map' has more than MINI_N_INLINE 1-bits, it may point to memory
220 * allocated with malloc().
222 * - The caller could provide storage on the stack for situations where
223 * that makes sense. So far that's only proved useful for
224 * minimask_combine(), but the principle works elsewhere.
226 * The implementation maintains and depends on the invariant that every element
227 * in 'values' is nonzero; that is, wherever a 1-bit appears in 'map', the
228 * corresponding element of 'values' must be nonzero.
232 uint32_t inline_values[MINI_N_INLINE];
233 uint32_t map[MINI_N_MAPS];
236 void miniflow_init(struct miniflow *, const struct flow *);
237 void miniflow_clone(struct miniflow *, const struct miniflow *);
238 void miniflow_destroy(struct miniflow *);
240 void miniflow_expand(const struct miniflow *, struct flow *);
242 uint32_t miniflow_get(const struct miniflow *, unsigned int u32_ofs);
243 uint16_t miniflow_get_vid(const struct miniflow *);
245 bool miniflow_equal(const struct miniflow *a, const struct miniflow *b);
246 bool miniflow_equal_in_minimask(const struct miniflow *a,
247 const struct miniflow *b,
248 const struct minimask *);
249 bool miniflow_equal_flow_in_minimask(const struct miniflow *a,
250 const struct flow *b,
251 const struct minimask *);
252 uint32_t miniflow_hash(const struct miniflow *, uint32_t basis);
253 uint32_t miniflow_hash_in_minimask(const struct miniflow *,
254 const struct minimask *, uint32_t basis);
256 /* Compressed flow wildcards. */
258 /* A sparse representation of a "struct flow_wildcards".
260 * See the large comment on struct miniflow for details. */
262 struct miniflow masks;
265 void minimask_init(struct minimask *, const struct flow_wildcards *);
266 void minimask_clone(struct minimask *, const struct minimask *);
267 void minimask_combine(struct minimask *dst,
268 const struct minimask *a, const struct minimask *b,
269 uint32_t storage[FLOW_U32S]);
270 void minimask_destroy(struct minimask *);
272 void minimask_expand(const struct minimask *, struct flow_wildcards *);
274 uint32_t minimask_get(const struct minimask *, unsigned int u32_ofs);
275 uint16_t minimask_get_vid_mask(const struct minimask *);
277 bool minimask_equal(const struct minimask *a, const struct minimask *b);
278 uint32_t minimask_hash(const struct minimask *, uint32_t basis);
280 bool minimask_has_extra(const struct minimask *, const struct minimask *);
281 bool minimask_is_catchall(const struct minimask *);