/* * Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #ifndef OPENFLOW_NICIRA_EXT_H #define OPENFLOW_NICIRA_EXT_H 1 #include "openflow/openflow.h" #include "openvswitch/types.h" /* The following vendor extensions, proposed by Nicira Networks, are not yet * standardized, so they are not included in openflow.h. Some of them may be * suitable for standardization; others we never expect to standardize. */ #define NX_VENDOR_ID 0x00002320 /* Nicira vendor-specific error messages extension. * * OpenFlow 1.0 has a set of predefined error types (OFPET_*) and codes (which * are specific to each type). It does not have any provision for * vendor-specific error codes, and it does not even provide "generic" error * codes that can apply to problems not anticipated by the OpenFlow * specification authors. * * This extension attempts to address the problem by adding a generic "error * vendor extension". The extension works as follows: use NXET_VENDOR as type * and NXVC_VENDOR_ERROR as code, followed by struct nx_vendor_error with * vendor-specific details, followed by at least 64 bytes of the failed * request. * * It would be better to have a type-specific vendor extension, e.g. so that * OFPET_BAD_ACTION could be used with vendor-specific code values. But * OFPET_BAD_ACTION and most other standardized types already specify that * their 'data' values are (the start of) the OpenFlow message being replied * to, so there is no room to insert a vendor ID. * * Currently this extension is only implemented by Open vSwitch, but it seems * like a reasonable candidate for future standardization. */ /* This is a random number to avoid accidental collision with any other * vendor's extension. */ #define NXET_VENDOR 0xb0c2 /* ofp_error msg 'code' values for NXET_VENDOR. */ enum nx_vendor_code { NXVC_VENDOR_ERROR /* 'data' contains struct nx_vendor_error. */ }; /* 'data' for 'type' == NXET_VENDOR, 'code' == NXVC_VENDOR_ERROR. */ struct nx_vendor_error { ovs_be32 vendor; /* Vendor ID as in struct ofp_vendor_header. */ ovs_be16 type; /* Vendor-defined type. */ ovs_be16 code; /* Vendor-defined subtype. */ /* Followed by at least the first 64 bytes of the failed request. */ }; /* Specific Nicira extension error numbers. * * These are the "code" values used in nx_vendor_error. So far, the "type" * values in nx_vendor_error are the same as those in ofp_error_msg. That is, * at Nicira so far we've only needed additional vendor-specific 'code' values, * so we're using the existing 'type' values to avoid having to invent new ones * that duplicate the current ones' meanings. */ /* Additional "code" values for OFPET_BAD_REQUEST. */ enum nx_bad_request_code { /* Nicira Extended Match (NXM) errors. */ /* Generic error code used when there is an error in an NXM sent to the * switch. The switch may use one of the more specific error codes below, * if there is an appropriate one, to simplify debugging, but it is not * required to do so. */ NXBRC_NXM_INVALID = 0x100, /* The nxm_type, or nxm_type taken in combination with nxm_hasmask or * nxm_length or both, is invalid or not implemented. */ NXBRC_NXM_BAD_TYPE = 0x101, /* Invalid nxm_value. */ NXBRC_NXM_BAD_VALUE = 0x102, /* Invalid nxm_mask. */ NXBRC_NXM_BAD_MASK = 0x103, /* A prerequisite was not met. */ NXBRC_NXM_BAD_PREREQ = 0x104, /* A given nxm_type was specified more than once. */ NXBRC_NXM_DUP_TYPE = 0x105 }; /* Additional "code" values for OFPET_FLOW_MOD_FAILED. */ enum nx_flow_mod_failed_code { /* Generic hardware error. */ NXFMFC_HARDWARE = 0x100, /* A nonexistent table ID was specified in the "command" field of struct * ofp_flow_mod, when the nxt_flow_mod_table_id extension is enabled. * (This extension is not yet implemented on this branch of Open * vSwitch.) */ NXFMFC_BAD_TABLE_ID = 0x101 }; /* Nicira vendor requests and replies. */ /* Header for Nicira vendor requests and replies. */ struct nicira_header { struct ofp_header header; ovs_be32 vendor; /* NX_VENDOR_ID. */ ovs_be32 subtype; /* One of NXT_* below. */ }; OFP_ASSERT(sizeof(struct nicira_header) == 16); /* Values for the 'subtype' member of struct nicira_header. */ enum nicira_type { /* Switch status request. The request body is an ASCII string that * specifies a prefix of the key names to include in the output; if it is * the null string, then all key-value pairs are included. */ NXT_STATUS_REQUEST, /* Switch status reply. The reply body is an ASCII string of key-value * pairs in the form "key=value\n". */ NXT_STATUS_REPLY, /* No longer used. */ NXT_ACT_SET_CONFIG__OBSOLETE, NXT_ACT_GET_CONFIG__OBSOLETE, NXT_COMMAND_REQUEST__OBSOLETE, NXT_COMMAND_REPLY__OBSOLETE, NXT_FLOW_END_CONFIG__OBSOLETE, NXT_FLOW_END__OBSOLETE, NXT_MGMT__OBSOLETE, /* Use the high 32 bits of the cookie field as the tunnel ID in the flow * match. */ NXT_TUN_ID_FROM_COOKIE, /* Controller role support. The request body is struct nx_role_request. * The reply echos the request. */ NXT_ROLE_REQUEST, NXT_ROLE_REPLY, /* Flexible flow specification (aka NXM = Nicira Extended Match). */ NXT_SET_FLOW_FORMAT, /* Set flow format. */ NXT_FLOW_MOD, /* Analogous to OFPT_FLOW_MOD. */ NXT_FLOW_REMOVED /* Analogous to OFPT_FLOW_REMOVED. */ }; /* Header for Nicira vendor stats request and reply messages. */ struct nicira_stats_msg { struct ofp_header header; /* OFPT_STATS_REQUEST or OFPT_STATS_REPLY. */ ovs_be16 type; /* OFPST_VENDOR. */ ovs_be16 flags; /* OFPSF_{REQ,REPLY}_*. */ ovs_be32 vendor; /* NX_VENDOR_ID. */ ovs_be32 subtype; /* One of NXST_* below. */ uint8_t pad[4]; /* Align to 64-bits. */ }; OFP_ASSERT(sizeof(struct nicira_stats_msg) == 24); /* Values for the 'subtype' member of struct nicira_stats_msg. */ enum nicira_stats_type { /* Flexible flow specification (aka NXM = Nicira Extended Match). */ NXST_FLOW, /* Analogous to OFPST_FLOW. */ NXST_AGGREGATE /* Analogous to OFPST_AGGREGATE. */ }; /* NXT_TUN_ID_FROM_COOKIE request. */ struct nxt_tun_id_cookie { struct ofp_header header; ovs_be32 vendor; /* NX_VENDOR_ID. */ ovs_be32 subtype; /* NXT_TUN_ID_FROM_COOKIE */ uint8_t set; /* Nonzero to enable, zero to disable. */ uint8_t pad[7]; }; OFP_ASSERT(sizeof(struct nxt_tun_id_cookie) == 24); /* Configures the "role" of the sending controller. The default role is: * * - Other (NX_ROLE_OTHER), which allows the controller access to all * OpenFlow features. * * The other possible roles are a related pair: * * - Master (NX_ROLE_MASTER) is equivalent to Other, except that there may * be at most one Master controller at a time: when a controller * configures itself as Master, any existing Master is demoted to the * Slave role. * * - Slave (NX_ROLE_SLAVE) allows the controller read-only access to * OpenFlow features. In particular attempts to modify the flow table * will be rejected with an OFPBRC_EPERM error. * * Slave controllers do not receive OFPT_PACKET_IN or OFPT_FLOW_REMOVED * messages, but they do receive OFPT_PORT_STATUS messages. */ struct nx_role_request { struct nicira_header nxh; ovs_be32 role; /* One of NX_ROLE_*. */ }; enum nx_role { NX_ROLE_OTHER, /* Default role, full access. */ NX_ROLE_MASTER, /* Full access, at most one. */ NX_ROLE_SLAVE /* Read-only access. */ }; /* Nicira vendor flow actions. */ enum nx_action_subtype { NXAST_SNAT__OBSOLETE, /* No longer used. */ NXAST_RESUBMIT, /* struct nx_action_resubmit */ NXAST_SET_TUNNEL, /* struct nx_action_set_tunnel */ NXAST_DROP_SPOOFED_ARP, /* struct nx_action_drop_spoofed_arp */ NXAST_SET_QUEUE, /* struct nx_action_set_queue */ NXAST_POP_QUEUE, /* struct nx_action_pop_queue */ NXAST_REG_MOVE, /* struct nx_action_reg_move */ NXAST_REG_LOAD, /* struct nx_action_reg_load */ NXAST_NOTE, /* struct nx_action_note */ NXAST_SET_TUNNEL64, /* struct nx_action_set_tunnel64 */ NXAST_MULTIPATH /* struct nx_action_multipath */ }; /* Header for Nicira-defined actions. */ struct nx_action_header { ovs_be16 type; /* OFPAT_VENDOR. */ ovs_be16 len; /* Length is 16. */ ovs_be32 vendor; /* NX_VENDOR_ID. */ ovs_be16 subtype; /* NXAST_*. */ uint8_t pad[6]; }; OFP_ASSERT(sizeof(struct nx_action_header) == 16); /* Action structure for NXAST_RESUBMIT. * * NXAST_RESUBMIT searches the flow table again, using a flow that is slightly * modified from the original lookup: * * - The 'in_port' member of struct nx_action_resubmit is used as the flow's * in_port. * * - If NXAST_RESUBMIT is preceded by actions that affect the flow * (e.g. OFPAT_SET_VLAN_VID), then the flow is updated with the new * values. * * Following the lookup, the original in_port is restored. * * If the modified flow matched in the flow table, then the corresponding * actions are executed. Afterward, actions following NXAST_RESUBMIT in the * original set of actions, if any, are executed; any changes made to the * packet (e.g. changes to VLAN) by secondary actions persist when those * actions are executed, although the original in_port is restored. * * NXAST_RESUBMIT may be used any number of times within a set of actions. * * NXAST_RESUBMIT may nest to an implementation-defined depth. Beyond this * implementation-defined depth, further NXAST_RESUBMIT actions are simply * ignored. (Open vSwitch 1.0.1 and earlier did not support recursion.) */ struct nx_action_resubmit { ovs_be16 type; /* OFPAT_VENDOR. */ ovs_be16 len; /* Length is 16. */ ovs_be32 vendor; /* NX_VENDOR_ID. */ ovs_be16 subtype; /* NXAST_RESUBMIT. */ ovs_be16 in_port; /* New in_port for checking flow table. */ uint8_t pad[4]; }; OFP_ASSERT(sizeof(struct nx_action_resubmit) == 16); /* Action structure for NXAST_SET_TUNNEL. * * Sets the encapsulating tunnel ID to a 32-bit value. The most-significant 32 * bits of the tunnel ID are set to 0. */ struct nx_action_set_tunnel { ovs_be16 type; /* OFPAT_VENDOR. */ ovs_be16 len; /* Length is 16. */ ovs_be32 vendor; /* NX_VENDOR_ID. */ ovs_be16 subtype; /* NXAST_SET_TUNNEL. */ uint8_t pad[2]; ovs_be32 tun_id; /* Tunnel ID. */ }; OFP_ASSERT(sizeof(struct nx_action_set_tunnel) == 16); /* Action structure for NXAST_SET_TUNNEL64. * * Sets the encapsulating tunnel ID to a 64-bit value. */ struct nx_action_set_tunnel64 { ovs_be16 type; /* OFPAT_VENDOR. */ ovs_be16 len; /* Length is 16. */ ovs_be32 vendor; /* NX_VENDOR_ID. */ ovs_be16 subtype; /* NXAST_SET_TUNNEL64. */ uint8_t pad[6]; ovs_be64 tun_id; /* Tunnel ID. */ }; OFP_ASSERT(sizeof(struct nx_action_set_tunnel64) == 24); /* Action structure for NXAST_DROP_SPOOFED_ARP. * * Stops processing further actions, if the packet being processed is an * Ethernet+IPv4 ARP packet for which the source Ethernet address inside the * ARP packet differs from the source Ethernet address in the Ethernet header. * * (This action is deprecated in favor of defining flows using the * NXM_NX_ARP_SHA flow match and will likely be removed in a future version * of Open vSwitch.) */ struct nx_action_drop_spoofed_arp { ovs_be16 type; /* OFPAT_VENDOR. */ ovs_be16 len; /* Length is 16. */ ovs_be32 vendor; /* NX_VENDOR_ID. */ ovs_be16 subtype; /* NXAST_DROP_SPOOFED_ARP. */ uint8_t pad[6]; }; OFP_ASSERT(sizeof(struct nx_action_drop_spoofed_arp) == 16); /* Action structure for NXAST_SET_QUEUE. * * Set the queue that should be used when packets are output. This is similar * to the OpenFlow OFPAT_ENQUEUE action, but does not take the output port as * an argument. This allows the queue to be defined before the port is * known. */ struct nx_action_set_queue { ovs_be16 type; /* OFPAT_VENDOR. */ ovs_be16 len; /* Length is 16. */ ovs_be32 vendor; /* NX_VENDOR_ID. */ ovs_be16 subtype; /* NXAST_SET_QUEUE. */ uint8_t pad[2]; ovs_be32 queue_id; /* Where to enqueue packets. */ }; OFP_ASSERT(sizeof(struct nx_action_set_queue) == 16); /* Action structure for NXAST_POP_QUEUE. * * Restores the queue to the value it was before any NXAST_SET_QUEUE actions * were used. Only the original queue can be restored this way; no stack is * maintained. */ struct nx_action_pop_queue { ovs_be16 type; /* OFPAT_VENDOR. */ ovs_be16 len; /* Length is 16. */ ovs_be32 vendor; /* NX_VENDOR_ID. */ ovs_be16 subtype; /* NXAST_POP_QUEUE. */ uint8_t pad[6]; }; OFP_ASSERT(sizeof(struct nx_action_pop_queue) == 16); /* Action structure for NXAST_REG_MOVE. * * Copies src[src_ofs:src_ofs+n_bits] to dst[dst_ofs:dst_ofs+n_bits], where * a[b:c] denotes the bits within 'a' numbered 'b' through 'c' (not including * bit 'c'). Bit numbering starts at 0 for the least-significant bit, 1 for * the next most significant bit, and so on. * * 'src' and 'dst' are nxm_header values with nxm_hasmask=0. (It doesn't make * sense to use nxm_hasmask=1 because the action does not do any kind of * matching; it uses the actual value of a field.) * * The following nxm_header values are potentially acceptable as 'src': * * - NXM_OF_IN_PORT * - NXM_OF_ETH_DST * - NXM_OF_ETH_SRC * - NXM_OF_ETH_TYPE * - NXM_OF_VLAN_TCI * - NXM_OF_IP_TOS * - NXM_OF_IP_PROTO * - NXM_OF_IP_SRC * - NXM_OF_IP_DST * - NXM_OF_TCP_SRC * - NXM_OF_TCP_DST * - NXM_OF_UDP_SRC * - NXM_OF_UDP_DST * - NXM_OF_ICMP_TYPE * - NXM_OF_ICMP_CODE * - NXM_OF_ARP_OP * - NXM_OF_ARP_SPA * - NXM_OF_ARP_TPA * - NXM_NX_TUN_ID * - NXM_NX_ARP_SHA * - NXM_NX_ARP_THA * - NXM_NX_ICMPV6_TYPE * - NXM_NX_ICMPV6_CODE * - NXM_NX_REG(idx) for idx in the switch's accepted range. * * The following nxm_header values are potentially acceptable as 'dst': * * - NXM_NX_REG(idx) for idx in the switch's accepted range. * * - NXM_OF_VLAN_TCI. Modifying this field's value has side effects on the * packet's 802.1Q header. Setting a value with CFI=0 removes the 802.1Q * header (if any), ignoring the other bits. Setting a value with CFI=1 * adds or modifies the 802.1Q header appropriately, setting the TCI field * to the field's new value (with the CFI bit masked out). * * - NXM_NX_TUN_ID. Modifying this value modifies the tunnel ID used for the * packet's next tunnel encapsulation. * * A given nxm_header value may be used as 'src' or 'dst' only on a flow whose * nx_match satisfies its prerequisites. For example, NXM_OF_IP_TOS may be * used only if the flow's nx_match includes an nxm_entry that specifies * nxm_type=NXM_OF_ETH_TYPE, nxm_hasmask=0, and nxm_value=0x0800. * * The switch will reject actions for which src_ofs+n_bits is greater than the * width of 'src' or dst_ofs+n_bits is greater than the width of 'dst' with * error type OFPET_BAD_ACTION, code OFPBAC_BAD_ARGUMENT. */ struct nx_action_reg_move { ovs_be16 type; /* OFPAT_VENDOR. */ ovs_be16 len; /* Length is 16. */ ovs_be32 vendor; /* NX_VENDOR_ID. */ ovs_be16 subtype; /* NXAST_REG_MOVE. */ ovs_be16 n_bits; /* Number of bits. */ ovs_be16 src_ofs; /* Starting bit offset in source. */ ovs_be16 dst_ofs; /* Starting bit offset in destination. */ ovs_be32 src; /* Source register. */ ovs_be32 dst; /* Destination register. */ }; OFP_ASSERT(sizeof(struct nx_action_reg_move) == 24); /* Action structure for NXAST_REG_LOAD. * * Copies value[0:n_bits] to dst[ofs:ofs+n_bits], where a[b:c] denotes the bits * within 'a' numbered 'b' through 'c' (not including bit 'c'). Bit numbering * starts at 0 for the least-significant bit, 1 for the next most significant * bit, and so on. * * 'dst' is an nxm_header with nxm_hasmask=0. See the documentation for * NXAST_REG_MOVE, above, for the permitted fields and for the side effects of * loading them. * * The 'ofs' and 'n_bits' fields are combined into a single 'ofs_nbits' field * to avoid enlarging the structure by another 8 bytes. To allow 'n_bits' to * take a value between 1 and 64 (inclusive) while taking up only 6 bits, it is * also stored as one less than its true value: * * 15 6 5 0 * +------------------------------+------------------+ * | ofs | n_bits - 1 | * +------------------------------+------------------+ * * The switch will reject actions for which ofs+n_bits is greater than the * width of 'dst', or in which any bits in 'value' with value 2**n_bits or * greater are set to 1, with error type OFPET_BAD_ACTION, code * OFPBAC_BAD_ARGUMENT. */ struct nx_action_reg_load { ovs_be16 type; /* OFPAT_VENDOR. */ ovs_be16 len; /* Length is 16. */ ovs_be32 vendor; /* NX_VENDOR_ID. */ ovs_be16 subtype; /* NXAST_REG_LOAD. */ ovs_be16 ofs_nbits; /* (ofs << 6) | (n_bits - 1). */ ovs_be32 dst; /* Destination register. */ ovs_be64 value; /* Immediate value. */ }; OFP_ASSERT(sizeof(struct nx_action_reg_load) == 24); /* Action structure for NXAST_NOTE. * * This action has no effect. It is variable length. The switch does not * attempt to interpret the user-defined 'note' data in any way. A controller * can use this action to attach arbitrary metadata to a flow. * * This action might go away in the future. */ struct nx_action_note { ovs_be16 type; /* OFPAT_VENDOR. */ ovs_be16 len; /* A multiple of 8, but at least 16. */ ovs_be32 vendor; /* NX_VENDOR_ID. */ ovs_be16 subtype; /* NXAST_NOTE. */ uint8_t note[6]; /* Start of user-defined data. */ /* Possibly followed by additional user-defined data. */ }; OFP_ASSERT(sizeof(struct nx_action_note) == 16); /* Action structure for NXAST_MULTIPATH. * * This action performs the following steps in sequence: * * 1. Hashes the fields designated by 'fields', one of NX_MP_FIELDS_*. * Refer to the definition of "enum nx_mp_fields" for details. * * The 'basis' value is used as a universal hash parameter, that is, * different values of 'basis' yield different hash functions. The * particular universal hash function used is implementation-defined. * * The hashed fields' values are drawn from the current state of the * flow, including all modifications that have been made by actions up to * this point. * * 2. Applies the multipath link choice algorithm specified by 'algorithm', * one of NX_MP_ALG_*. Refer to the definition of "enum nx_mp_algorithm" * for details. * * The output of the algorithm is 'link', an unsigned integer less than * or equal to 'max_link'. * * Some algorithms use 'arg' as an additional argument. * * 3. Stores 'link' in dst[ofs:ofs+n_bits]. The format and semantics of * 'dst' and 'ofs_nbits' are identical to those for the NXAST_REG_LOAD * action; refer to the description of that action for details. * * The switch will reject actions that have an unknown 'fields', or an unknown * 'algorithm', or in which ofs+n_bits is greater than the width of 'dst', or * in which 'max_link' is greater than or equal to 2**n_bits, with error type * OFPET_BAD_ACTION, code OFPBAC_BAD_ARGUMENT. */ struct nx_action_multipath { ovs_be16 type; /* OFPAT_VENDOR. */ ovs_be16 len; /* Length is 32. */ ovs_be32 vendor; /* NX_VENDOR_ID. */ ovs_be16 subtype; /* NXAST_MULTIPATH. */ /* What fields to hash and how. */ ovs_be16 fields; /* One of NX_MP_FIELDS_*. */ ovs_be16 basis; /* Universal hash parameter. */ ovs_be16 pad0; /* Multipath link choice algorithm to apply to hash value. */ ovs_be16 algorithm; /* One of NX_MP_ALG_*. */ ovs_be16 max_link; /* Number of output links, minus 1. */ ovs_be32 arg; /* Algorithm-specific argument. */ ovs_be16 pad1; /* Where to store the result. */ ovs_be16 ofs_nbits; /* (ofs << 6) | (n_bits - 1). */ ovs_be32 dst; /* Destination register. */ }; OFP_ASSERT(sizeof(struct nx_action_multipath) == 32); /* NXAST_MULTIPATH: Fields to hash. */ enum nx_mp_fields { /* Ethernet source address (NXM_OF_ETH_SRC) only. */ NX_MP_FIELDS_ETH_SRC, /* L2 through L4, symmetric across src/dst. Specifically, each of the * following fields, if present, is hashed (slashes separate symmetric * pairs): * * - NXM_OF_ETH_DST / NXM_OF_ETH_SRC * - NXM_OF_ETH_TYPE * - The VID bits from NXM_OF_VLAN_TCI, ignoring PCP and CFI. * - NXM_OF_IP_PROTO * - NXM_OF_IP_SRC / NXM_OF_IP_DST * - NXM_OF_TCP_SRC / NXM_OF_TCP_DST * - NXM_OF_UDP_SRC / NXM_OF_UDP_DST */ NX_MP_FIELDS_SYMMETRIC_L4 }; /* NXAST_MULTIPATH: Multipath link choice algorithm to apply. * * In the descriptions below, 'n_links' is max_link + 1. */ enum nx_mp_algorithm { /* link = hash(flow) % n_links. * * Redistributes all traffic when n_links changes. O(1) performance. See * RFC 2992. * * Use UINT16_MAX for max_link to get a raw hash value. */ NX_MP_ALG_MODULO_N, /* link = hash(flow) / (MAX_HASH / n_links). * * Redistributes between one-quarter and one-half of traffic when n_links * changes. O(1) performance. See RFC 2992. */ NX_MP_ALG_HASH_THRESHOLD, /* for i in [0,n_links): * weights[i] = hash(flow, i) * link = { i such that weights[i] >= weights[j] for all j != i } * * Redistributes 1/n_links of traffic when n_links changes. O(n_links) * performance. If n_links is greater than a threshold (currently 64, but * subject to change), Open vSwitch will substitute another algorithm * automatically. See RFC 2992. */ NX_MP_ALG_HRW, /* Highest Random Weight. */ /* i = 0 * repeat: * i = i + 1 * link = hash(flow, i) % arg * while link > max_link * * Redistributes 1/n_links of traffic when n_links changes. O(1) * performance when arg/max_link is bounded by a constant. * * Redistributes all traffic when arg changes. * * arg must be greater than max_link and for best performance should be no * more than approximately max_link * 2. If arg is outside the acceptable * range, Open vSwitch will automatically substitute the least power of 2 * greater than max_link. * * This algorithm is specific to Open vSwitch. */ NX_MP_ALG_ITER_HASH /* Iterative Hash. */ }; /* Wildcard for tunnel ID. */ #define NXFW_TUN_ID (1 << 25) #define NXFW_ALL NXFW_TUN_ID #define OVSFW_ALL (OFPFW_ALL | NXFW_ALL) /* Flexible flow specifications (aka NXM = Nicira Extended Match). * * OpenFlow 1.0 has "struct ofp_match" for specifying flow matches. This * structure is fixed-length and hence difficult to extend. This section * describes a more flexible, variable-length flow match, called "nx_match" for * short, that is also supported by Open vSwitch. This section also defines a * replacement for each OpenFlow message that includes struct ofp_match. * * * Format * ====== * * An nx_match is a sequence of zero or more "nxm_entry"s, which are * type-length-value (TLV) entries, each 5 to 259 (inclusive) bytes long. * "nxm_entry"s are not aligned on or padded to any multibyte boundary. The * first 4 bytes of an nxm_entry are its "header", followed by the entry's * "body". * * An nxm_entry's header is interpreted as a 32-bit word in network byte order: * * |<-------------------- nxm_type ------------------>| * | | * |31 16 15 9| 8 7 0 * +----------------------------------+---------------+--+------------------+ * | nxm_vendor | nxm_field |hm| nxm_length | * +----------------------------------+---------------+--+------------------+ * * The most-significant 23 bits of the header are collectively "nxm_type". * Bits 16...31 are "nxm_vendor", one of the NXM_VENDOR_* values below. Bits * 9...15 are "nxm_field", which is a vendor-specific value. nxm_type normally * designates a protocol header, such as the Ethernet type, but it can also * refer to packet metadata, such as the switch port on which a packet arrived. * * Bit 8 is "nxm_hasmask" (labeled "hm" above for space reasons). The meaning * of this bit is explained later. * * The least-significant 8 bits are "nxm_length", a positive integer. The * length of the nxm_entry, including the header, is exactly 4 + nxm_length * bytes. * * For a given nxm_vendor, nxm_field, and nxm_hasmask value, nxm_length is a * constant. It is included only to allow software to minimally parse * "nxm_entry"s of unknown types. (Similarly, for a given nxm_vendor, * nxm_field, and nxm_length, nxm_hasmask is a constant.) * * * Semantics * ========= * * A zero-length nx_match (one with no "nxm_entry"s) matches every packet. * * An nxm_entry places a constraint on the packets matched by the nx_match: * * - If nxm_hasmask is 0, the nxm_entry's body contains a value for the * field, called "nxm_value". The nx_match matches only packets in which * the field equals nxm_value. * * - If nxm_hasmask is 1, then the nxm_entry's body contains a value for the * field (nxm_value), followed by a bitmask of the same length as the * value, called "nxm_mask". For each 1-bit in position J in nxm_mask, the * nx_match matches only packets for which bit J in the given field's value * matches bit J in nxm_value. A 0-bit in nxm_mask causes the * corresponding bits in nxm_value and the field's value to be ignored. * (The sense of the nxm_mask bits is the opposite of that used by the * "wildcards" member of struct ofp_match.) * * When nxm_hasmask is 1, nxm_length is always even. * * An all-zero-bits nxm_mask is equivalent to omitting the nxm_entry * entirely. An all-one-bits nxm_mask is equivalent to specifying 0 for * nxm_hasmask. * * When there are multiple "nxm_entry"s, all of the constraints must be met. * * * Mask Restrictions * ================= * * Masks may be restricted: * * - Some nxm_types may not support masked wildcards, that is, nxm_hasmask * must always be 0 when these fields are specified. For example, the * field that identifies the port on which a packet was received may not be * masked. * * - Some nxm_types that do support masked wildcards may only support certain * nxm_mask patterns. For example, fields that have IPv4 address values * may be restricted to CIDR masks. * * These restrictions should be noted in specifications for individual fields. * A switch may accept an nxm_hasmask or nxm_mask value that the specification * disallows, if the switch correctly implements support for that nxm_hasmask * or nxm_mask value. A switch must reject an attempt to set up a flow that * contains a nxm_hasmask or nxm_mask value that it does not support. * * * Prerequisite Restrictions * ========================= * * The presence of an nxm_entry with a given nxm_type may be restricted based * on the presence of or values of other "nxm_entry"s. For example: * * - An nxm_entry for nxm_type=NXM_OF_IP_TOS is allowed only if it is * preceded by another entry with nxm_type=NXM_OF_ETH_TYPE, nxm_hasmask=0, * and nxm_value=0x0800. That is, matching on the IP source address is * allowed only if the Ethernet type is explicitly set to IP. * * - An nxm_entry for nxm_type=NXM_OF_TCP_SRC is allowed only if it is preced * by an entry with nxm_type=NXM_OF_ETH_TYPE, nxm_hasmask=0, * nxm_value=0x0800 and another with nxm_type=NXM_OF_IP_PROTO, * nxm_hasmask=0, nxm_value=6, in that order. That is, matching on the TCP * source port is allowed only if the Ethernet type is IP and the IP * protocol is TCP. * * These restrictions should be noted in specifications for individual fields. * A switch may implement relaxed versions of these restrictions. A switch * must reject an attempt to set up a flow that violates its restrictions. * * * Ordering Restrictions * ===================== * * An nxm_entry that has prerequisite restrictions must appear after the * "nxm_entry"s for its prerequisites. Ordering of "nxm_entry"s within an * nx_match is not otherwise constrained. * * Any given nxm_type may appear in an nx_match at most once. * * * nxm_entry Examples * ================== * * These examples show the format of a single nxm_entry with particular * nxm_hasmask and nxm_length values. The diagrams are labeled with field * numbers and byte indexes. * * * 8-bit nxm_value, nxm_hasmask=1, nxm_length=1: * * 0 3 4 5 * +------------+---+---+ * | header | v | m | * +------------+---+---+ * * * 16-bit nxm_value, nxm_hasmask=0, nxm_length=2: * * 0 3 4 5 * +------------+------+ * | header | value| * +------------+------+ * * * 32-bit nxm_value, nxm_hasmask=0, nxm_length=4: * * 0 3 4 7 * +------------+-------------+ * | header | nxm_value | * +------------+-------------+ * * * 48-bit nxm_value, nxm_hasmask=0, nxm_length=6: * * 0 3 4 9 * +------------+------------------+ * | header | nxm_value | * +------------+------------------+ * * * 48-bit nxm_value, nxm_hasmask=1, nxm_length=12: * * 0 3 4 9 10 15 * +------------+------------------+------------------+ * | header | nxm_value | nxm_mask | * +------------+------------------+------------------+ * * * Error Reporting * =============== * * A switch should report an error in an nx_match using error type * OFPET_BAD_REQUEST and one of the NXBRC_NXM_* codes. Ideally the switch * should report a specific error code, if one is assigned for the particular * problem, but NXBRC_NXM_INVALID is also available to report a generic * nx_match error. */ #define NXM_HEADER__(VENDOR, FIELD, HASMASK, LENGTH) \ (((VENDOR) << 16) | ((FIELD) << 9) | ((HASMASK) << 8) | (LENGTH)) #define NXM_HEADER(VENDOR, FIELD, LENGTH) \ NXM_HEADER__(VENDOR, FIELD, 0, LENGTH) #define NXM_HEADER_W(VENDOR, FIELD, LENGTH) \ NXM_HEADER__(VENDOR, FIELD, 1, (LENGTH) * 2) #define NXM_VENDOR(HEADER) ((HEADER) >> 16) #define NXM_FIELD(HEADER) (((HEADER) >> 9) & 0x7f) #define NXM_TYPE(HEADER) (((HEADER) >> 9) & 0x7fffff) #define NXM_HASMASK(HEADER) (((HEADER) >> 8) & 1) #define NXM_LENGTH(HEADER) ((HEADER) & 0xff) #define NXM_MAKE_WILD_HEADER(HEADER) \ NXM_HEADER_W(NXM_VENDOR(HEADER), NXM_FIELD(HEADER), NXM_LENGTH(HEADER)) /* ## ------------------------------- ## */ /* ## OpenFlow 1.0-compatible fields. ## */ /* ## ------------------------------- ## */ /* Physical or virtual port on which the packet was received. * * Prereqs: None. * * Format: 16-bit integer in network byte order. * * Masking: Not maskable. */ #define NXM_OF_IN_PORT NXM_HEADER (0x0000, 0, 2) /* Source or destination address in Ethernet header. * * Prereqs: None. * * Format: 48-bit Ethernet MAC address. * * Masking: The nxm_mask patterns 01:00:00:00:00:00 and FE:FF:FF:FF:FF:FF must * be supported for NXM_OF_ETH_DST_W (as well as the trivial patterns that * are all-0-bits or all-1-bits). Support for other patterns and for masking * of NXM_OF_ETH_SRC is optional. */ #define NXM_OF_ETH_DST NXM_HEADER (0x0000, 1, 6) #define NXM_OF_ETH_DST_W NXM_HEADER_W(0x0000, 1, 6) #define NXM_OF_ETH_SRC NXM_HEADER (0x0000, 2, 6) /* Packet's Ethernet type. * * For an Ethernet II packet this is taken from the Ethernet header. For an * 802.2 LLC+SNAP header with OUI 00-00-00 this is taken from the SNAP header. * A packet that has neither format has value 0x05ff * (OFP_DL_TYPE_NOT_ETH_TYPE). * * For a packet with an 802.1Q header, this is the type of the encapsulated * frame. * * Prereqs: None. * * Format: 16-bit integer in network byte order. * * Masking: Not maskable. */ #define NXM_OF_ETH_TYPE NXM_HEADER (0x0000, 3, 2) /* 802.1Q TCI. * * For a packet with an 802.1Q header, this is the Tag Control Information * (TCI) field, with the CFI bit forced to 1. For a packet with no 802.1Q * header, this has value 0. * * Prereqs: None. * * Format: 16-bit integer in network byte order. * * Masking: Arbitrary masks. * * This field can be used in various ways: * * - If it is not constrained at all, the nx_match matches packets without * an 802.1Q header or with an 802.1Q header that has any TCI value. * * - Testing for an exact match with 0 matches only packets without an * 802.1Q header. * * - Testing for an exact match with a TCI value with CFI=1 matches packets * that have an 802.1Q header with a specified VID and PCP. * * - Testing for an exact match with a nonzero TCI value with CFI=0 does * not make sense. The switch may reject this combination. * * - Testing with a specific VID and CFI=1, with nxm_mask=0x1fff, matches * packets that have an 802.1Q header with that VID (and any PCP). * * - Testing with a specific PCP and CFI=1, with nxm_mask=0xf000, matches * packets that have an 802.1Q header with that PCP (and any VID). * * - Testing with nxm_value=0, nxm_mask=0x0fff matches packets with no 802.1Q * header or with an 802.1Q header with a VID of 0. * * - Testing with nxm_value=0, nxm_mask=0xe000 matches packets with no 802.1Q * header or with an 802.1Q header with a PCP of 0. * * - Testing with nxm_value=0, nxm_mask=0xefff matches packets with no 802.1Q * header or with an 802.1Q header with both VID and PCP of 0. */ #define NXM_OF_VLAN_TCI NXM_HEADER (0x0000, 4, 2) #define NXM_OF_VLAN_TCI_W NXM_HEADER_W(0x0000, 4, 2) /* The "type of service" byte of the IP header, with the ECN bits forced to 0. * * Prereqs: NXM_OF_ETH_TYPE must be either 0x0800 or 0x86dd. * * Format: 8-bit integer with 2 least-significant bits forced to 0. * * Masking: Not maskable. */ #define NXM_OF_IP_TOS NXM_HEADER (0x0000, 5, 1) /* The "protocol" byte in the IP header. * * Prereqs: NXM_OF_ETH_TYPE must be either 0x0800 or 0x86dd. * * Format: 8-bit integer. * * Masking: Not maskable. */ #define NXM_OF_IP_PROTO NXM_HEADER (0x0000, 6, 1) /* The source or destination address in the IP header. * * Prereqs: NXM_OF_ETH_TYPE must match 0x0800 exactly. * * Format: 32-bit integer in network byte order. * * Masking: Only CIDR masks are allowed, that is, masks that consist of N * high-order bits set to 1 and the other 32-N bits set to 0. */ #define NXM_OF_IP_SRC NXM_HEADER (0x0000, 7, 4) #define NXM_OF_IP_SRC_W NXM_HEADER_W(0x0000, 7, 4) #define NXM_OF_IP_DST NXM_HEADER (0x0000, 8, 4) #define NXM_OF_IP_DST_W NXM_HEADER_W(0x0000, 8, 4) /* The source or destination port in the TCP header. * * Prereqs: * NXM_OF_ETH_TYPE must be either 0x0800 or 0x86dd. * NXM_OF_IP_PROTO must match 6 exactly. * * Format: 16-bit integer in network byte order. * * Masking: Not maskable. */ #define NXM_OF_TCP_SRC NXM_HEADER (0x0000, 9, 2) #define NXM_OF_TCP_DST NXM_HEADER (0x0000, 10, 2) /* The source or destination port in the UDP header. * * Prereqs: * NXM_OF_ETH_TYPE must match either 0x0800 or 0x86dd. * NXM_OF_IP_PROTO must match 17 exactly. * * Format: 16-bit integer in network byte order. * * Masking: Not maskable. */ #define NXM_OF_UDP_SRC NXM_HEADER (0x0000, 11, 2) #define NXM_OF_UDP_DST NXM_HEADER (0x0000, 12, 2) /* The type or code in the ICMP header. * * Prereqs: * NXM_OF_ETH_TYPE must match 0x0800 exactly. * NXM_OF_IP_PROTO must match 1 exactly. * * Format: 8-bit integer. * * Masking: Not maskable. */ #define NXM_OF_ICMP_TYPE NXM_HEADER (0x0000, 13, 1) #define NXM_OF_ICMP_CODE NXM_HEADER (0x0000, 14, 1) /* ARP opcode. * * For an Ethernet+IP ARP packet, the opcode in the ARP header. Always 0 * otherwise. Only ARP opcodes between 1 and 255 should be specified for * matching. * * Prereqs: NXM_OF_ETH_TYPE must match 0x0806 exactly. * * Format: 16-bit integer in network byte order. * * Masking: Not maskable. */ #define NXM_OF_ARP_OP NXM_HEADER (0x0000, 15, 2) /* For an Ethernet+IP ARP packet, the source or target protocol address * in the ARP header. Always 0 otherwise. * * Prereqs: NXM_OF_ETH_TYPE must match 0x0806 exactly. * * Format: 32-bit integer in network byte order. * * Masking: Only CIDR masks are allowed, that is, masks that consist of N * high-order bits set to 1 and the other 32-N bits set to 0. */ #define NXM_OF_ARP_SPA NXM_HEADER (0x0000, 16, 4) #define NXM_OF_ARP_SPA_W NXM_HEADER_W(0x0000, 16, 4) #define NXM_OF_ARP_TPA NXM_HEADER (0x0000, 17, 4) #define NXM_OF_ARP_TPA_W NXM_HEADER_W(0x0000, 17, 4) /* ## ------------------------ ## */ /* ## Nicira match extensions. ## */ /* ## ------------------------ ## */ /* Metadata registers. * * Registers initially have value 0. Actions allow register values to be * manipulated. * * Prereqs: None. * * Format: Array of 32-bit integer registers. Space is reserved for up to * NXM_NX_MAX_REGS registers, but switches may implement fewer. * * Masking: Arbitrary masks. */ #define NXM_NX_MAX_REGS 16 #define NXM_NX_REG(IDX) NXM_HEADER (0x0001, IDX, 4) #define NXM_NX_REG_W(IDX) NXM_HEADER_W(0x0001, IDX, 4) #define NXM_NX_REG_IDX(HEADER) NXM_FIELD(HEADER) #define NXM_IS_NX_REG(HEADER) (!((((HEADER) ^ NXM_NX_REG0)) & 0xffffe1ff)) #define NXM_IS_NX_REG_W(HEADER) (!((((HEADER) ^ NXM_NX_REG0_W)) & 0xffffe1ff)) #define NXM_NX_REG0 NXM_HEADER (0x0001, 0, 4) #define NXM_NX_REG0_W NXM_HEADER_W(0x0001, 0, 4) #define NXM_NX_REG1 NXM_HEADER (0x0001, 1, 4) #define NXM_NX_REG1_W NXM_HEADER_W(0x0001, 1, 4) #define NXM_NX_REG2 NXM_HEADER (0x0001, 2, 4) #define NXM_NX_REG2_W NXM_HEADER_W(0x0001, 2, 4) #define NXM_NX_REG3 NXM_HEADER (0x0001, 3, 4) #define NXM_NX_REG3_W NXM_HEADER_W(0x0001, 3, 4) /* Tunnel ID. * * For a packet received via GRE tunnel including a (32-bit) key, the key is * stored in the low 32-bits and the high bits are zeroed. For other packets, * the value is 0. * * Prereqs: None. * * Format: 64-bit integer in network byte order. * * Masking: Arbitrary masks. */ #define NXM_NX_TUN_ID NXM_HEADER (0x0001, 16, 8) #define NXM_NX_TUN_ID_W NXM_HEADER_W(0x0001, 16, 8) /* For an Ethernet+IP ARP packet, the source or target hardware address * in the ARP header. Always 0 otherwise. * * Prereqs: NXM_OF_ETH_TYPE must match 0x0806 exactly. * * Format: 48-bit Ethernet MAC address. * * Masking: Not maskable. */ #define NXM_NX_ARP_SHA NXM_HEADER (0x0001, 17, 6) #define NXM_NX_ARP_THA NXM_HEADER (0x0001, 18, 6) /* The source or destination address in the IPv6 header. * * Prereqs: NXM_OF_ETH_TYPE must match 0x86dd exactly. * * Format: 128-bit IPv6 address. * * Masking: Only CIDR masks are allowed, that is, masks that consist of N * high-order bits set to 1 and the other 128-N bits set to 0. */ #define NXM_NX_IPV6_SRC NXM_HEADER (0x0001, 19, 16) #define NXM_NX_IPV6_SRC_W NXM_HEADER_W(0x0001, 19, 16) #define NXM_NX_IPV6_DST NXM_HEADER (0x0001, 20, 16) #define NXM_NX_IPV6_DST_W NXM_HEADER_W(0x0001, 20, 16) /* The type or code in the ICMPv6 header. * * Prereqs: * NXM_OF_ETH_TYPE must match 0x86dd exactly. * NXM_OF_IP_PROTO must match 58 exactly. * * Format: 8-bit integer. * * Masking: Not maskable. */ #define NXM_NX_ICMPV6_TYPE NXM_HEADER (0x0001, 21, 1) #define NXM_NX_ICMPV6_CODE NXM_HEADER (0x0001, 22, 1) /* ## --------------------- ## */ /* ## Requests and replies. ## */ /* ## --------------------- ## */ enum nx_flow_format { NXFF_OPENFLOW10 = 0, /* Standard OpenFlow 1.0 compatible. */ NXFF_TUN_ID_FROM_COOKIE = 1, /* OpenFlow 1.0, plus obtain tunnel ID from * cookie. */ NXFF_NXM = 2 /* Nicira extended match. */ }; /* NXT_SET_FLOW_FORMAT request. */ struct nxt_set_flow_format { struct ofp_header header; ovs_be32 vendor; /* NX_VENDOR_ID. */ ovs_be32 subtype; /* NXT_SET_FLOW_FORMAT. */ ovs_be32 format; /* One of NXFF_*. */ }; OFP_ASSERT(sizeof(struct nxt_set_flow_format) == 20); /* NXT_FLOW_MOD (analogous to OFPT_FLOW_MOD). */ struct nx_flow_mod { struct nicira_header nxh; ovs_be64 cookie; /* Opaque controller-issued identifier. */ ovs_be16 command; /* One of OFPFC_*. */ ovs_be16 idle_timeout; /* Idle time before discarding (seconds). */ ovs_be16 hard_timeout; /* Max time before discarding (seconds). */ ovs_be16 priority; /* Priority level of flow entry. */ ovs_be32 buffer_id; /* Buffered packet to apply to (or -1). Not meaningful for OFPFC_DELETE*. */ ovs_be16 out_port; /* For OFPFC_DELETE* commands, require matching entries to include this as an output port. A value of OFPP_NONE indicates no restriction. */ ovs_be16 flags; /* One of OFPFF_*. */ ovs_be16 match_len; /* Size of nx_match. */ uint8_t pad[6]; /* Align to 64-bits. */ /* Followed by: * - Exactly match_len (possibly 0) bytes containing the nx_match, then * - Exactly (match_len + 7)/8*8 - match_len (between 0 and 7) bytes of * all-zero bytes, then * - Actions to fill out the remainder of the message length (always a * multiple of 8). */ }; OFP_ASSERT(sizeof(struct nx_flow_mod) == 48); /* NXT_FLOW_REMOVED (analogous to OFPT_FLOW_REMOVED). */ struct nx_flow_removed { struct nicira_header nxh; ovs_be64 cookie; /* Opaque controller-issued identifier. */ ovs_be16 priority; /* Priority level of flow entry. */ uint8_t reason; /* One of OFPRR_*. */ uint8_t pad[1]; /* Align to 32-bits. */ ovs_be32 duration_sec; /* Time flow was alive in seconds. */ ovs_be32 duration_nsec; /* Time flow was alive in nanoseconds beyond duration_sec. */ ovs_be16 idle_timeout; /* Idle timeout from original flow mod. */ ovs_be16 match_len; /* Size of nx_match. */ ovs_be64 packet_count; ovs_be64 byte_count; /* Followed by: * - Exactly match_len (possibly 0) bytes containing the nx_match, then * - Exactly (match_len + 7)/8*8 - match_len (between 0 and 7) bytes of * all-zero bytes. */ }; OFP_ASSERT(sizeof(struct nx_flow_removed) == 56); /* Nicira vendor stats request of type NXST_FLOW (analogous to OFPST_FLOW * request). */ struct nx_flow_stats_request { struct nicira_stats_msg nsm; ovs_be16 out_port; /* Require matching entries to include this as an output port. A value of OFPP_NONE indicates no restriction. */ ovs_be16 match_len; /* Length of nx_match. */ uint8_t table_id; /* ID of table to read (from ofp_table_stats) or 0xff for all tables. */ uint8_t pad[3]; /* Align to 64 bits. */ /* Followed by: * - Exactly match_len (possibly 0) bytes containing the nx_match, then * - Exactly (match_len + 7)/8*8 - match_len (between 0 and 7) bytes of * all-zero bytes, which must also exactly fill out the length of the * message. */ }; OFP_ASSERT(sizeof(struct nx_flow_stats_request) == 32); /* Body for Nicira vendor stats reply of type NXST_FLOW (analogous to * OFPST_FLOW reply). */ struct nx_flow_stats { ovs_be16 length; /* Length of this entry. */ uint8_t table_id; /* ID of table flow came from. */ uint8_t pad; ovs_be32 duration_sec; /* Time flow has been alive in seconds. */ ovs_be32 duration_nsec; /* Time flow has been alive in nanoseconds beyond duration_sec. */ ovs_be16 priority; /* Priority of the entry. Only meaningful when this is not an exact-match entry. */ ovs_be16 idle_timeout; /* Number of seconds idle before expiration. */ ovs_be16 hard_timeout; /* Number of seconds before expiration. */ ovs_be16 match_len; /* Length of nx_match. */ uint8_t pad2[4]; /* Align to 64 bits. */ ovs_be64 cookie; /* Opaque controller-issued identifier. */ ovs_be64 packet_count; /* Number of packets in flow. */ ovs_be64 byte_count; /* Number of bytes in flow. */ /* Followed by: * - Exactly match_len (possibly 0) bytes containing the nx_match, then * - Exactly (match_len + 7)/8*8 - match_len (between 0 and 7) bytes of * all-zero bytes, then * - Actions to fill out the remainder 'length' bytes (always a multiple * of 8). */ }; OFP_ASSERT(sizeof(struct nx_flow_stats) == 48); /* Nicira vendor stats request of type NXST_AGGREGATE (analogous to * OFPST_AGGREGATE request). */ struct nx_aggregate_stats_request { struct nicira_stats_msg nsm; ovs_be16 out_port; /* Require matching entries to include this as an output port. A value of OFPP_NONE indicates no restriction. */ ovs_be16 match_len; /* Length of nx_match. */ uint8_t table_id; /* ID of table to read (from ofp_table_stats) or 0xff for all tables. */ uint8_t pad[3]; /* Align to 64 bits. */ /* Followed by: * - Exactly match_len (possibly 0) bytes containing the nx_match, then * - Exactly (match_len + 7)/8*8 - match_len (between 0 and 7) bytes of * all-zero bytes, which must also exactly fill out the length of the * message. */ }; OFP_ASSERT(sizeof(struct nx_aggregate_stats_request) == 32); /* Body for nicira_stats_msg reply of type NXST_AGGREGATE (analogous to * OFPST_AGGREGATE reply). * * ofp_aggregate_stats_reply does not contain an ofp_match structure, so we * reuse it entirely. (It would be very odd to use OFPST_AGGREGATE to reply to * an NXST_AGGREGATE request, so we don't do that.) */ struct nx_aggregate_stats_reply { struct nicira_stats_msg nsm; struct ofp_aggregate_stats_reply asr; }; OFP_ASSERT(sizeof(struct nx_aggregate_stats_reply) == 48); #endif /* openflow/nicira-ext.h */