2 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 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.
16 #ifndef OPENVSWITCH_FLOW_H
17 #define OPENVSWITCH_FLOW_H 1
19 #include "openflow/nicira-ext.h"
20 #include "openvswitch/packets.h"
21 #include "openvswitch/util.h"
23 /* This sequence number should be incremented whenever anything involving flows
24 * or the wildcarding of flows changes. This will cause build assertion
25 * failures in places which likely need to be updated. */
26 #define FLOW_WC_SEQ 35
28 /* Number of Open vSwitch extension 32-bit registers. */
30 BUILD_ASSERT_DECL(FLOW_N_REGS <= NXM_NX_MAX_REGS);
31 BUILD_ASSERT_DECL(FLOW_N_REGS % 2 == 0); /* Even. */
33 /* Number of OpenFlow 1.5+ 64-bit registers.
35 * Each of these overlays a pair of Open vSwitch 32-bit registers, so there
36 * are half as many of them.*/
37 #define FLOW_N_XREGS (FLOW_N_REGS / 2)
39 /* Used for struct flow's dl_type member for frames that have no Ethernet
40 * type, that is, pure 802.2 frames. */
41 #define FLOW_DL_TYPE_NONE 0x5ff
43 /* Fragment bits, used for IPv4 and IPv6, always zero for non-IP flows. */
44 #define FLOW_NW_FRAG_ANY (1 << 0) /* Set for any IP frag. */
45 #define FLOW_NW_FRAG_LATER (1 << 1) /* Set for IP frag with nonzero offset. */
46 #define FLOW_NW_FRAG_MASK (FLOW_NW_FRAG_ANY | FLOW_NW_FRAG_LATER)
48 BUILD_ASSERT_DECL(FLOW_NW_FRAG_ANY == NX_IP_FRAG_ANY);
49 BUILD_ASSERT_DECL(FLOW_NW_FRAG_LATER == NX_IP_FRAG_LATER);
51 BUILD_ASSERT_DECL(FLOW_TNL_F_OAM == NX_TUN_FLAG_OAM);
53 const char *flow_tun_flag_to_string(uint32_t flags);
55 /* Maximum number of supported MPLS labels. */
56 #define FLOW_MAX_MPLS_LABELS 3
59 * A flow in the network.
61 * Must be initialized to all zeros to make any compiler-induced padding
62 * zeroed. Helps also in keeping unused fields (such as mutually exclusive
63 * IPv4 and IPv6 addresses) zeroed out.
65 * The meaning of 'in_port' is context-dependent. In most cases, it is a
66 * 16-bit OpenFlow 1.0 port number. In the software datapath interface (dpif)
67 * layer and its implementations (e.g. dpif-netlink, dpif-netdev), it is
68 * instead a 32-bit datapath port number.
70 * The fields are organized in four segments to facilitate staged lookup, where
71 * lower layer fields are first used to determine if the later fields need to
72 * be looked at. This enables better wildcarding for datapath flows.
74 * NOTE: Order of the fields is significant, any change in the order must be
75 * reflected in miniflow_extract()!
79 struct flow_tnl tunnel; /* Encapsulating tunnel parameters. */
80 ovs_be64 metadata; /* OpenFlow Metadata. */
81 uint32_t regs[FLOW_N_REGS]; /* Registers. */
82 uint32_t skb_priority; /* Packet priority for QoS. */
83 uint32_t pkt_mark; /* Packet mark. */
84 uint32_t dp_hash; /* Datapath computed hash value. The exact
85 * computation is opaque to the user space. */
86 union flow_in_port in_port; /* Input port.*/
87 uint32_t recirc_id; /* Must be exact match. */
88 uint16_t ct_state; /* Connection tracking state. */
89 uint16_t ct_zone; /* Connection tracking zone. */
90 uint32_t ct_mark; /* Connection mark.*/
91 uint8_t pad1[4]; /* Pad to 64 bits. */
92 ovs_u128 ct_label; /* Connection label. */
93 uint32_t conj_id; /* Conjunction ID. */
94 ofp_port_t actset_output; /* Output port in action set. */
95 uint8_t pad2[2]; /* Pad to 64 bits. */
97 /* L2, Order the same as in the Ethernet header! (64-bit aligned) */
98 struct eth_addr dl_dst; /* Ethernet destination address. */
99 struct eth_addr dl_src; /* Ethernet source address. */
100 ovs_be16 dl_type; /* Ethernet frame type. */
101 ovs_be16 vlan_tci; /* If 802.1Q, TCI | VLAN_CFI; otherwise 0. */
102 ovs_be32 mpls_lse[ROUND_UP(FLOW_MAX_MPLS_LABELS, 2)]; /* MPLS label stack
104 /* L3 (64-bit aligned) */
105 ovs_be32 nw_src; /* IPv4 source address. */
106 ovs_be32 nw_dst; /* IPv4 destination address. */
107 struct in6_addr ipv6_src; /* IPv6 source address. */
108 struct in6_addr ipv6_dst; /* IPv6 destination address. */
109 ovs_be32 ipv6_label; /* IPv6 flow label. */
110 uint8_t nw_frag; /* FLOW_FRAG_* flags. */
111 uint8_t nw_tos; /* IP ToS (including DSCP and ECN). */
112 uint8_t nw_ttl; /* IP TTL/Hop Limit. */
113 uint8_t nw_proto; /* IP protocol or low 8 bits of ARP opcode. */
114 struct in6_addr nd_target; /* IPv6 neighbor discovery (ND) target. */
115 struct eth_addr arp_sha; /* ARP/ND source hardware address. */
116 struct eth_addr arp_tha; /* ARP/ND target hardware address. */
117 ovs_be16 tcp_flags; /* TCP flags. With L3 to avoid matching L4. */
118 ovs_be16 pad3; /* Pad to 64 bits. */
120 /* L4 (64-bit aligned) */
121 ovs_be16 tp_src; /* TCP/UDP/SCTP source port/ICMP type. */
122 ovs_be16 tp_dst; /* TCP/UDP/SCTP destination port/ICMP code. */
123 ovs_be32 igmp_group_ip4; /* IGMP group IPv4 address.
124 * Keep last for BUILD_ASSERT_DECL below. */
126 BUILD_ASSERT_DECL(sizeof(struct flow) % sizeof(uint64_t) == 0);
127 BUILD_ASSERT_DECL(sizeof(struct flow_tnl) % sizeof(uint64_t) == 0);
129 #define FLOW_U64S (sizeof(struct flow) / sizeof(uint64_t))
131 /* Remember to update FLOW_WC_SEQ when changing 'struct flow'. */
132 BUILD_ASSERT_DECL(offsetof(struct flow, igmp_group_ip4) + sizeof(uint32_t)
133 == sizeof(struct flow_tnl) + 216
134 && FLOW_WC_SEQ == 35);
136 /* Incremental points at which flow classification may be performed in
138 * This is located here since this is dependent on the structure of the
139 * struct flow defined above:
140 * Each offset must be on a distinct, successive U64 boundary strictly
141 * within the struct flow. */
143 FLOW_SEGMENT_1_ENDS_AT = offsetof(struct flow, dl_dst),
144 FLOW_SEGMENT_2_ENDS_AT = offsetof(struct flow, nw_src),
145 FLOW_SEGMENT_3_ENDS_AT = offsetof(struct flow, tp_src),
147 BUILD_ASSERT_DECL(FLOW_SEGMENT_1_ENDS_AT % sizeof(uint64_t) == 0);
148 BUILD_ASSERT_DECL(FLOW_SEGMENT_2_ENDS_AT % sizeof(uint64_t) == 0);
149 BUILD_ASSERT_DECL(FLOW_SEGMENT_3_ENDS_AT % sizeof(uint64_t) == 0);
150 BUILD_ASSERT_DECL( 0 < FLOW_SEGMENT_1_ENDS_AT);
151 BUILD_ASSERT_DECL(FLOW_SEGMENT_1_ENDS_AT < FLOW_SEGMENT_2_ENDS_AT);
152 BUILD_ASSERT_DECL(FLOW_SEGMENT_2_ENDS_AT < FLOW_SEGMENT_3_ENDS_AT);
153 BUILD_ASSERT_DECL(FLOW_SEGMENT_3_ENDS_AT < sizeof(struct flow));
155 /* Wildcards for a flow.
157 * A 1-bit in each bit in 'masks' indicates that the corresponding bit of
158 * the flow is significant (must match). A 0-bit indicates that the
159 * corresponding bit of the flow is wildcarded (need not match). */
160 struct flow_wildcards {
164 #define WC_MASK_FIELD(WC, FIELD) \
165 memset(&(WC)->masks.FIELD, 0xff, sizeof (WC)->masks.FIELD)
166 #define WC_MASK_FIELD_MASK(WC, FIELD, MASK) \
167 ((WC)->masks.FIELD |= (MASK))
168 #define WC_UNMASK_FIELD(WC, FIELD) \
169 memset(&(WC)->masks.FIELD, 0, sizeof (WC)->masks.FIELD)
171 void flow_wildcards_init_catchall(struct flow_wildcards *);
173 void flow_wildcards_init_for_packet(struct flow_wildcards *,
174 const struct flow *);
176 void flow_wildcards_clear_non_packet_fields(struct flow_wildcards *);
178 bool flow_wildcards_is_catchall(const struct flow_wildcards *);
180 void flow_wildcards_set_reg_mask(struct flow_wildcards *,
181 int idx, uint32_t mask);
182 void flow_wildcards_set_xreg_mask(struct flow_wildcards *,
183 int idx, uint64_t mask);
185 void flow_wildcards_and(struct flow_wildcards *dst,
186 const struct flow_wildcards *src1,
187 const struct flow_wildcards *src2);
188 void flow_wildcards_or(struct flow_wildcards *dst,
189 const struct flow_wildcards *src1,
190 const struct flow_wildcards *src2);
191 bool flow_wildcards_has_extra(const struct flow_wildcards *,
192 const struct flow_wildcards *);
193 uint32_t flow_wildcards_hash(const struct flow_wildcards *, uint32_t basis);
194 bool flow_wildcards_equal(const struct flow_wildcards *,
195 const struct flow_wildcards *);