2 * Copyright (c) 2008, 2009, 2010 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.
19 #include <sys/types.h>
20 #include <netinet/in.h>
24 #include "openflow/nicira-ext.h"
25 #include "openflow/openflow.h"
27 #include "openvswitch/xflow.h"
39 typedef struct flow flow_t;
41 uint32_t wildcards; /* Wildcards. */
42 uint32_t priority; /* Priority. */
43 uint32_t tun_id; /* Encapsulating tunnel ID. */
44 uint32_t nw_src; /* IP source address. */
45 uint32_t nw_dst; /* IP destination address. */
46 uint16_t in_port; /* Input switch port. */
47 uint16_t dl_vlan; /* Input VLAN. */
48 uint16_t dl_type; /* Ethernet frame type. */
49 uint16_t tp_src; /* TCP/UDP source port. */
50 uint16_t tp_dst; /* TCP/UDP destination port. */
51 uint8_t dl_src[ETH_ADDR_LEN]; /* Ethernet source address. */
52 uint8_t dl_dst[ETH_ADDR_LEN]; /* Ethernet destination address. */
53 uint8_t nw_proto; /* IP protocol or low 8 bits of ARP opcode. */
54 uint8_t dl_vlan_pcp; /* Input VLAN priority. */
55 uint8_t nw_tos; /* IP ToS (DSCP field, 6 bits). */
58 /* Assert that there are FLOW_SIG_SIZE bytes of significant data in "struct
59 * flow", followed by FLOW_PAD_SIZE bytes of padding. */
60 #define FLOW_SIG_SIZE 45
61 #define FLOW_PAD_SIZE 3
62 BUILD_ASSERT_DECL(offsetof(struct flow, nw_tos) == FLOW_SIG_SIZE - 1);
63 BUILD_ASSERT_DECL(sizeof(((struct flow *)0)->nw_tos) == 1);
64 BUILD_ASSERT_DECL(sizeof(struct flow) == FLOW_SIG_SIZE + FLOW_PAD_SIZE);
66 int flow_extract(struct ofpbuf *, uint32_t tun_id, uint16_t in_port, flow_t *);
67 void flow_extract_stats(const flow_t *flow, struct ofpbuf *packet,
68 struct xflow_flow_stats *stats);
69 void flow_to_match(const flow_t *,
70 bool tun_id_from_cookie, struct ofp_match *);
71 void flow_from_match(const struct ofp_match *, uint32_t priority,
72 bool tun_id_from_cookie, uint64_t cookie, flow_t *);
73 char *flow_to_string(const flow_t *);
74 void flow_format(struct ds *, const flow_t *);
75 void flow_print(FILE *, const flow_t *);
76 static inline int flow_compare_headers(const flow_t *, const flow_t *);
77 static inline bool flow_equal_headers(const flow_t *, const flow_t *);
78 static inline size_t flow_hash_headers(const flow_t *, uint32_t basis);
80 /* Compares members of 'a' and 'b' except for 'wildcards' and 'priority' and
81 * returns a strcmp()-like return value. */
83 flow_compare_headers(const flow_t *a, const flow_t *b)
85 /* Assert that 'wildcards' and 'priority' are leading 32-bit fields. */
86 BUILD_ASSERT_DECL(offsetof(struct flow, wildcards) == 0);
87 BUILD_ASSERT_DECL(sizeof(((struct flow *)0)->wildcards) == 4);
88 BUILD_ASSERT_DECL(offsetof(struct flow, priority) == 4);
89 BUILD_ASSERT_DECL(sizeof(((struct flow *)0)->priority) == 4);
91 return memcmp((char *) a + 8, (char *) b + 8, FLOW_SIG_SIZE - 8);
94 /* Returns true if all members of 'a' and 'b' are equal except for 'wildcards'
95 * and 'priority', false otherwise. */
97 flow_equal_headers(const flow_t *a, const flow_t *b)
99 return !flow_compare_headers(a, b);
102 /* Returns a hash value for 'flow' that does not include 'wildcards' or
103 * 'priority', folding 'basis' into the hash value. */
105 flow_hash_headers(const flow_t *flow, uint32_t basis)
107 /* Assert that 'wildcards' and 'priority' are leading 32-bit fields. */
108 BUILD_ASSERT_DECL(offsetof(struct flow, wildcards) == 0);
109 BUILD_ASSERT_DECL(sizeof(((struct flow *)0)->wildcards) == 4);
110 BUILD_ASSERT_DECL(offsetof(struct flow, priority) == 4);
111 BUILD_ASSERT_DECL(sizeof(((struct flow *)0)->priority) == 4);
113 return hash_bytes((char *) flow + 8, FLOW_SIG_SIZE - 8, basis);
116 /* Information on wildcards for a flow, as a supplement to flow_t. */
117 struct flow_wildcards {
118 uint32_t nw_src_mask; /* 1-bit in each significant nw_src bit. */
119 uint32_t nw_dst_mask; /* 1-bit in each significant nw_dst bit. */
122 /* Given the wildcard bit count in bits 'shift' through 'shift + 5' (inclusive)
123 * of 'wildcards', returns a 32-bit bit mask with a 1 in each bit that must
124 * match and a 0 in each bit that is wildcarded.
126 * The bits in 'wildcards' are in the format used in enum ofp_flow_wildcards: 0
127 * is exact match, 1 ignores the LSB, 2 ignores the 2 least-significant bits,
128 * ..., 32 and higher wildcard the entire field. This is the *opposite* of the
129 * usual convention where e.g. /24 indicates that 8 bits (not 24 bits) are
132 * 'wildcards' is in host byte order. The return value is in network byte
134 static inline uint32_t
135 flow_nw_bits_to_mask(uint32_t wildcards, int shift)
137 wildcards = (wildcards >> shift) & 0x3f;
138 return wildcards < 32 ? htonl(~((1u << wildcards) - 1)) : 0;
142 flow_wildcards_init(struct flow_wildcards *wc, uint32_t wildcards)
144 wildcards &= OVSFW_ALL;
145 wc->nw_src_mask = flow_nw_bits_to_mask(wildcards, OFPFW_NW_SRC_SHIFT);
146 wc->nw_dst_mask = flow_nw_bits_to_mask(wildcards, OFPFW_NW_DST_SHIFT);