include/openvswitch/datapath-protocol.h

   1 /*
   2  * Copyright (c) 2009, 2010, 2011 Nicira Networks.
   3  *
   4  * This file is offered under your choice of two licenses: Apache 2.0 or GNU
   5  * GPL 2.0 or later.  The permission statements for each of these licenses is
   6  * given below.  You may license your modifications to this file under either
   7  * of these licenses or both.  If you wish to license your modifications under
   8  * only one of these licenses, delete the permission text for the other
   9  * license.
  10  *
  11  * ----------------------------------------------------------------------
  12  * Licensed under the Apache License, Version 2.0 (the "License");
  13  * you may not use this file except in compliance with the License.
  14  * You may obtain a copy of the License at:
  15  *
  16  *     http://www.apache.org/licenses/LICENSE-2.0
  17  *
  18  * Unless required by applicable law or agreed to in writing, software
  19  * distributed under the License is distributed on an "AS IS" BASIS,
  20  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  21  * See the License for the specific language governing permissions and
  22  * limitations under the License.
  23  * ----------------------------------------------------------------------
  24  * This program is free software; you can redistribute it and/or modify
  25  * it under the terms of the GNU General Public License as published by
  26  * the Free Software Foundation; either version 2 of the License, or
  27  * (at your option) any later version.
  28  *
  29  * This program is distributed in the hope that it will be useful,
  30  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  31  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  32  * GNU General Public License for more details.
  33  *
  34  * You should have received a copy of the GNU General Public License along
  35  * with this program; if not, write to the Free Software Foundation, Inc.,
  36  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  37  * ----------------------------------------------------------------------
  38  */
  39
  40 /* Protocol between userspace and kernel datapath.
  41  *
  42  * Be sure to update datapath/odp-compat.h if you change any of the structures
  43  * in here. */
  44
  45 #ifndef OPENVSWITCH_DATAPATH_PROTOCOL_H
  46 #define OPENVSWITCH_DATAPATH_PROTOCOL_H 1
  47
  48 /* The ovs_be<N> types indicate that an object is in big-endian, not
  49  * native-endian, byte order.  They are otherwise equivalent to uint<N>_t.
  50  * The Linux kernel already has __be<N> types for this, which take on
  51  * additional semantics when the "sparse" static checker is used, so we use
  52  * those types when compiling the kernel. */
  53 #ifdef __KERNEL__
  54 #include <linux/types.h>
  55 #include <linux/socket.h>
  56 #define ovs_be16 __be16
  57 #define ovs_be32 __be32
  58 #define ovs_be64 __be64
  59 #else
  60 #include "openvswitch/types.h"
  61 #include <sys/socket.h>
  62 #endif
  63
  64 #ifndef __aligned_u64
  65 #define __aligned_u64 __u64 __attribute__((aligned(8)))
  66 #define __aligned_be64 __be64 __attribute__((aligned(8)))
  67 #define __aligned_le64 __le64 __attribute__((aligned(8)))
  68 #endif
  69
  70 #include <linux/if_link.h>
  71 #include <linux/netlink.h>
  72 \f
  73 /* datapaths. */
  74
  75 #define ODP_DATAPATH_FAMILY  "odp_datapath"
  76 #define ODP_DATAPATH_MCGROUP "odp_datapath"
  77
  78 enum odp_datapath_cmd {
  79         ODP_DP_CMD_UNSPEC,
  80         ODP_DP_CMD_NEW,
  81         ODP_DP_CMD_DEL,
  82         ODP_DP_CMD_GET,
  83         ODP_DP_CMD_SET
  84 };
  85
  86 /**
  87  * struct odp_header - header for ODP Generic Netlink messages.
  88  * @dp_ifindex: ifindex of local port for datapath (0 to make a request not
  89  * specific to a datapath).
  90  *
  91  * Attributes following the header are specific to a particular ODP Generic
  92  * Netlink family, but all of the ODP families use this header.
  93  */
  94 struct odp_header {
  95         int dp_ifindex;
  96 };
  97 \f
  98 /**
  99  * enum odp_datapath_attr - attributes for %ODP_DP_* commands.
 100  * @ODP_DP_ATTR_NAME: Name of the network device that serves as the "local
 101  * port".  This is the name of the network device whose dp_ifindex is given in
 102  * the &struct odp_header.  Always present in notifications.  Required in
 103  * %ODP_DP_NEW requests.  May be used as an alternative to specifying
 104  * dp_ifindex in other requests (with a dp_ifindex of 0).
 105  * @ODP_DP_ATTR_STATS: Statistics about packets that have passed through the
 106  * datapath.  Always present in notifications.
 107  * @ODP_DP_ATTR_IPV4_FRAGS: One of %ODP_DP_FRAG_*.  Always present in
 108  * notifications.  May be included in %ODP_DP_NEW or %ODP_DP_SET requests to
 109  * change the fragment handling policy.
 110  * @ODP_DP_ATTR_SAMPLING: 32-bit fraction of packets to sample with
 111  * @ODP_PACKET_CMD_SAMPLE.  A value of 0 samples no packets, a value of
 112  * %UINT32_MAX samples all packets, and intermediate values sample intermediate
 113  * fractions of packets.
 114  * @ODP_DP_ATTR_MCGROUPS: Nested attributes with multicast groups.  Each nested
 115  * attribute has a %ODP_PACKET_CMD_* type with a 32-bit value giving the
 116  * Generic Netlink multicast group number used for sending this datapath's
 117  * messages with that command type up to userspace.
 118  *
 119  * These attributes follow the &struct odp_header within the Generic Netlink
 120  * payload for %ODP_DP_* commands.
 121  */
 122 enum odp_datapath_attr {
 123         ODP_DP_ATTR_UNSPEC,
 124         ODP_DP_ATTR_NAME,       /* name of dp_ifindex netdev */
 125         ODP_DP_ATTR_STATS,      /* struct odp_stats */
 126         ODP_DP_ATTR_IPV4_FRAGS, /* 32-bit enum odp_frag_handling */
 127         ODP_DP_ATTR_SAMPLING,   /* 32-bit fraction of packets to sample. */
 128         ODP_DP_ATTR_MCGROUPS,   /* Nested attributes with multicast groups. */
 129         __ODP_DP_ATTR_MAX
 130 };
 131
 132 #define ODP_DP_ATTR_MAX (__ODP_DP_ATTR_MAX - 1)
 133
 134 /**
 135  * enum odp_frag_handling - policy for handling received IPv4 fragments.
 136  * @ODP_DP_FRAG_ZERO: Treat IP fragments as IP protocol 0 and transport ports
 137  * zero.
 138  * @ODP_DP_FRAG_DROP: Drop IP fragments.  Do not pass them through the flow
 139  * table or up to userspace.
 140  */
 141 enum odp_frag_handling {
 142         ODP_DP_FRAG_UNSPEC,
 143         ODP_DP_FRAG_ZERO,       /* Treat IP fragments as transport port 0. */
 144         ODP_DP_FRAG_DROP        /* Drop IP fragments. */
 145 };
 146
 147 struct odp_stats {
 148     uint64_t n_frags;           /* Number of dropped IP fragments. */
 149     uint64_t n_hit;             /* Number of flow table matches. */
 150     uint64_t n_missed;          /* Number of flow table misses. */
 151     uint64_t n_lost;            /* Number of misses not sent to userspace. */
 152 };
 153
 154 /* Logical ports. */
 155 #define ODPP_LOCAL      ((uint16_t)0)
 156 \f
 157 #define ODP_PACKET_FAMILY "odp_packet"
 158
 159 enum odp_packet_cmd {
 160         ODP_PACKET_CMD_UNSPEC,
 161
 162         /* Kernel-to-user notifications. */
 163         ODP_PACKET_CMD_MISS,    /* Flow table miss. */
 164         ODP_PACKET_CMD_ACTION,  /* ODP_ACTION_ATTR_CONTROLLER action. */
 165         ODP_PACKET_CMD_SAMPLE,  /* Sampled packet. */
 166
 167         /* User commands. */
 168         ODP_PACKET_CMD_EXECUTE  /* Apply actions to a packet. */
 169 };
 170
 171 /**
 172  * enum odp_packet_attr - attributes for %ODP_PACKET_* commands.
 173  * @ODP_PACKET_ATTR_PACKET: Present for all notifications.  Contains the entire
 174  * packet as received, from the start of the Ethernet header onward.  For
 175  * %ODP_PACKET_CMD_ACTION, %ODP_PACKET_ATTR_PACKET reflects changes made by
 176  * actions preceding %ODP_ACTION_ATTR_CONTROLLER, but %ODP_PACKET_ATTR_KEY is
 177  * the flow key extracted from the packet as originally received.
 178  * @ODP_PACKET_ATTR_KEY: Present for all notifications.  Contains the flow key
 179  * extracted from the packet as nested %ODP_KEY_ATTR_* attributes.  This allows
 180  * userspace to adapt its flow setup strategy by comparing its notion of the
 181  * flow key against the kernel's.
 182  * @ODP_PACKET_ATTR_USERDATA: Present for an %ODP_PACKET_CMD_ACTION
 183  * notification if the %ODP_ACTION_ATTR_CONTROLLER, action's argument was
 184  * nonzero.
 185  * @ODP_PACKET_ATTR_SAMPLE_POOL: Present for %ODP_PACKET_CMD_SAMPLE.  Contains
 186  * the number of packets processed so far that were candidates for sampling.
 187  * @ODP_PACKET_ATTR_ACTIONS: Present for %ODP_PACKET_CMD_SAMPLE.  Contains a
 188  * copy of the actions applied to the packet, as nested %ODP_ACTION_ATTR_*
 189  * attributes.
 190  *
 191  * These attributes follow the &struct odp_header within the Generic Netlink
 192  * payload for %ODP_PACKET_* commands.
 193  */
 194 enum odp_packet_attr {
 195         ODP_PACKET_ATTR_UNSPEC,
 196         ODP_PACKET_ATTR_PACKET,      /* Packet data. */
 197         ODP_PACKET_ATTR_KEY,         /* Nested ODP_KEY_ATTR_* attributes. */
 198         ODP_PACKET_ATTR_USERDATA,    /* u64 ODP_ACTION_ATTR_CONTROLLER arg. */
 199         ODP_PACKET_ATTR_SAMPLE_POOL, /* # sampling candidate packets so far. */
 200         ODP_PACKET_ATTR_ACTIONS,     /* Nested ODP_ACTION_ATTR_* attributes. */
 201         __ODP_PACKET_ATTR_MAX
 202 };
 203
 204 #define ODP_PACKET_ATTR_MAX (__ODP_PACKET_ATTR_MAX - 1)
 205 \f
 206 enum odp_vport_type {
 207         ODP_VPORT_TYPE_UNSPEC,
 208         ODP_VPORT_TYPE_NETDEV,   /* network device */
 209         ODP_VPORT_TYPE_INTERNAL, /* network device implemented by datapath */
 210         ODP_VPORT_TYPE_PATCH,    /* virtual tunnel connecting two vports */
 211         ODP_VPORT_TYPE_GRE,      /* GRE tunnel */
 212         ODP_VPORT_TYPE_CAPWAP,   /* CAPWAP tunnel */
 213         __ODP_VPORT_TYPE_MAX
 214 };
 215
 216 #define ODP_VPORT_TYPE_MAX (__ODP_VPORT_TYPE_MAX - 1)
 217 \f
 218 #define ODP_VPORT_FAMILY  "odp_vport"
 219 #define ODP_VPORT_MCGROUP "odp_vport"
 220
 221 enum odp_vport_cmd {
 222         ODP_VPORT_CMD_UNSPEC,
 223         ODP_VPORT_CMD_NEW,
 224         ODP_VPORT_CMD_DEL,
 225         ODP_VPORT_CMD_GET,
 226         ODP_VPORT_CMD_SET
 227 };
 228
 229 /**
 230  * enum odp_vport_attr - attributes for %ODP_VPORT_* commands.
 231  * @ODP_VPORT_ATTR_PORT_NO: 32-bit port number within datapath.
 232  * @ODP_VPORT_ATTR_TYPE: 32-bit %ODP_VPORT_TYPE_* constant describing the type
 233  * of vport.
 234  * @ODP_VPORT_ATTR_NAME: Name of vport.  For a vport based on a network device
 235  * this is the name of the network device.  Maximum length %IFNAMSIZ-1 bytes
 236  * plus a null terminator.
 237  * @ODP_VPORT_ATTR_STATS: A &struct rtnl_link_stats64 giving statistics for
 238  * packets sent or received through the vport.
 239  * @ODP_VPORT_ATTR_ADDRESS: A 6-byte Ethernet address for the vport.
 240  * @ODP_VPORT_ATTR_MTU: MTU for the vport.  Omitted if the vport does not have
 241  * an MTU as, e.g., some tunnels do not.
 242  * @ODP_VPORT_ATTR_IFINDEX: ifindex of the underlying network device, if any.
 243  * @ODP_VPORT_ATTR_IFLINK: ifindex of the device on which packets are sent (for
 244  * tunnels), if any.
 245  *
 246  * These attributes follow the &struct odp_header within the Generic Netlink
 247  * payload for %ODP_VPORT_* commands.
 248  *
 249  * All attributes applicable to a given port are present in notifications.
 250  * This means that, for example, a vport that has no corresponding network
 251  * device would omit %ODP_VPORT_ATTR_IFINDEX.
 252  *
 253  * For %ODP_VPORT_CMD_NEW requests, the %ODP_VPORT_ATTR_TYPE and
 254  * %ODP_VPORT_ATTR_NAME attributes are required.  %ODP_VPORT_ATTR_PORT_NO is
 255  * optional; if not specified a free port number is automatically selected.
 256  * Whether %ODP_VPORT_ATTR_OPTIONS is required or optional depends on the type
 257  * of vport.  %ODP_VPORT_ATTR_STATS, %ODP_VPORT_ATTR_ADDRESS, and
 258  * %ODP_VPORT_ATTR_MTU are optional, and other attributes are ignored.
 259  *
 260  * For other requests, if %ODP_VPORT_ATTR_NAME is specified then it is used to
 261  * look up the vport to operate on; otherwise dp_idx from the &struct
 262  * odp_header plus %ODP_VPORT_ATTR_PORT_NO determine the vport.
 263  */
 264 enum odp_vport_attr {
 265         ODP_VPORT_ATTR_UNSPEC,
 266         ODP_VPORT_ATTR_PORT_NO, /* port number within datapath */
 267         ODP_VPORT_ATTR_TYPE,    /* 32-bit ODP_VPORT_TYPE_* constant. */
 268         ODP_VPORT_ATTR_NAME,    /* string name, up to IFNAMSIZ bytes long */
 269         ODP_VPORT_ATTR_STATS,   /* struct rtnl_link_stats64 */
 270         ODP_VPORT_ATTR_ADDRESS, /* hardware address */
 271         ODP_VPORT_ATTR_MTU,     /* 32-bit maximum transmission unit */
 272         ODP_VPORT_ATTR_OPTIONS, /* nested attributes, varies by vport type */
 273         ODP_VPORT_ATTR_IFINDEX, /* 32-bit ifindex of backing netdev */
 274         ODP_VPORT_ATTR_IFLINK,  /* 32-bit ifindex on which packets are sent */
 275         __ODP_VPORT_ATTR_MAX
 276 };
 277
 278 #define ODP_VPORT_ATTR_MAX (__ODP_VPORT_ATTR_MAX - 1)
 279
 280 /* ODP_VPORT_ATTR_OPTIONS attributes for patch vports. */
 281 enum {
 282         ODP_PATCH_ATTR_UNSPEC,
 283         ODP_PATCH_ATTR_PEER,    /* name of peer vport, as a string */
 284         __ODP_PATCH_ATTR_MAX
 285 };
 286
 287 #define ODP_PATCH_ATTR_MAX (__ODP_PATCH_ATTR_MAX - 1)
 288 \f
 289 /* Flows. */
 290
 291 #define ODP_FLOW_FAMILY  "odp_flow"
 292 #define ODP_FLOW_MCGROUP "odp_flow"
 293
 294 enum odp_flow_cmd {
 295         ODP_FLOW_CMD_UNSPEC,
 296         ODP_FLOW_CMD_NEW,
 297         ODP_FLOW_CMD_DEL,
 298         ODP_FLOW_CMD_GET,
 299         ODP_FLOW_CMD_SET
 300 };
 301
 302 struct odp_flow_stats {
 303     uint64_t n_packets;         /* Number of matched packets. */
 304     uint64_t n_bytes;           /* Number of matched bytes. */
 305 };
 306
 307 enum odp_key_type {
 308         ODP_KEY_ATTR_UNSPEC,
 309         ODP_KEY_ATTR_TUN_ID,    /* 64-bit tunnel ID */
 310         ODP_KEY_ATTR_IN_PORT,   /* 32-bit ODP port number */
 311         ODP_KEY_ATTR_ETHERNET,  /* struct odp_key_ethernet */
 312         ODP_KEY_ATTR_8021Q,     /* struct odp_key_8021q */
 313         ODP_KEY_ATTR_ETHERTYPE, /* 16-bit Ethernet type */
 314         ODP_KEY_ATTR_IPV4,      /* struct odp_key_ipv4 */
 315         ODP_KEY_ATTR_IPV6,      /* struct odp_key_ipv6 */
 316         ODP_KEY_ATTR_TCP,       /* struct odp_key_tcp */
 317         ODP_KEY_ATTR_UDP,       /* struct odp_key_udp */
 318         ODP_KEY_ATTR_ICMP,      /* struct odp_key_icmp */
 319         ODP_KEY_ATTR_ICMPV6,    /* struct odp_key_icmpv6 */
 320         ODP_KEY_ATTR_ARP,       /* struct odp_key_arp */
 321         ODP_KEY_ATTR_ND,        /* struct odp_key_nd */
 322         __ODP_KEY_ATTR_MAX
 323 };
 324
 325 #define ODP_KEY_ATTR_MAX (__ODP_KEY_ATTR_MAX - 1)
 326
 327 struct odp_key_ethernet {
 328         uint8_t  eth_src[6];
 329         uint8_t  eth_dst[6];
 330 };
 331
 332 struct odp_key_8021q {
 333         ovs_be16 q_tpid;
 334         ovs_be16 q_tci;
 335 };
 336
 337 struct odp_key_ipv4 {
 338         ovs_be32 ipv4_src;
 339         ovs_be32 ipv4_dst;
 340         uint8_t  ipv4_proto;
 341         uint8_t  ipv4_tos;
 342 };
 343
 344 struct odp_key_ipv6 {
 345         ovs_be32 ipv6_src[4];
 346         ovs_be32 ipv6_dst[4];
 347         uint8_t  ipv6_proto;
 348         uint8_t  ipv6_tos;
 349 };
 350
 351 struct odp_key_tcp {
 352         ovs_be16 tcp_src;
 353         ovs_be16 tcp_dst;
 354 };
 355
 356 struct odp_key_udp {
 357         ovs_be16 udp_src;
 358         ovs_be16 udp_dst;
 359 };
 360
 361 struct odp_key_icmp {
 362         uint8_t icmp_type;
 363         uint8_t icmp_code;
 364 };
 365
 366 struct odp_key_icmpv6 {
 367         uint8_t icmpv6_type;
 368         uint8_t icmpv6_code;
 369 };
 370
 371 struct odp_key_arp {
 372         ovs_be32 arp_sip;
 373         ovs_be32 arp_tip;
 374         ovs_be16 arp_op;
 375         uint8_t  arp_sha[6];
 376         uint8_t  arp_tha[6];
 377 };
 378
 379 struct odp_key_nd {
 380         uint32_t nd_target[4];
 381         uint8_t  nd_sll[6];
 382         uint8_t  nd_tll[6];
 383 };
 384
 385 /**
 386  * enum odp_flow_attr - attributes for %ODP_FLOW_* commands.
 387  * @ODP_FLOW_ATTR_KEY: Nested %ODP_KEY_ATTR_* attributes specifying the flow
 388  * key.  Always present in notifications.  Required for all requests (except
 389  * dumps).
 390  * @ODP_FLOW_ATTR_ACTIONS: Nested %ODPAT_* attributes specifying the actions to
 391  * take for packets that match the key.  Always present in notifications.
 392  * Required for %ODP_FLOW_CMD_NEW requests, optional on %ODP_FLOW_CMD_SET
 393  * request to change the existing actions, ignored for other requests.
 394  * @ODP_FLOW_ATTR_STATS: &struct odp_flow_stats giving statistics for this
 395  * flow.  Present in notifications if the stats would be nonzero.  Ignored in
 396  * requests.
 397  * @ODP_FLOW_ATTR_TCP_FLAGS: An 8-bit value giving the OR'd value of all of the
 398  * TCP flags seen on packets in this flow.  Only present in notifications for
 399  * TCP flows, and only if it would be nonzero.  Ignored in requests.
 400  * @ODP_FLOW_ATTR_USED: A 64-bit integer giving the time, in milliseconds on
 401  * the system monotonic clock, at which a packet was last processed for this
 402  * flow.  Only present in notifications if a packet has been processed for this
 403  * flow.  Ignored in requests.
 404  * @ODP_FLOW_ATTR_CLEAR: If present in a %ODP_FLOW_CMD_SET request, clears the
 405  * last-used time, accumulated TCP flags, and statistics for this flow.
 406  * Otherwise ignored in requests.  Never present in notifications.
 407  *
 408  * These attributes follow the &struct odp_header within the Generic Netlink
 409  * payload for %ODP_FLOW_* commands.
 410  */
 411 enum odp_flow_attr {
 412         ODP_FLOW_ATTR_UNSPEC,
 413         ODP_FLOW_ATTR_KEY,       /* Sequence of ODP_KEY_ATTR_* attributes. */
 414         ODP_FLOW_ATTR_ACTIONS,   /* Nested ODP_ACTION_ATTR_* attributes. */
 415         ODP_FLOW_ATTR_STATS,     /* struct odp_flow_stats. */
 416         ODP_FLOW_ATTR_TCP_FLAGS, /* 8-bit OR'd TCP flags. */
 417         ODP_FLOW_ATTR_USED,      /* u64 msecs last used in monotonic time. */
 418         ODP_FLOW_ATTR_CLEAR,     /* Flag to clear stats, tcp_flags, used. */
 419         __ODP_FLOW_ATTR_MAX
 420 };
 421
 422 #define ODP_FLOW_ATTR_MAX (__ODP_FLOW_ATTR_MAX - 1)
 423
 424 /* Action types. */
 425 enum odp_action_type {
 426         ODP_ACTION_ATTR_UNSPEC,
 427         ODP_ACTION_ATTR_OUTPUT,       /* Output to switch port. */
 428         ODP_ACTION_ATTR_CONTROLLER,   /* Send copy to controller. */
 429         ODP_ACTION_ATTR_SET_DL_TCI,   /* Set the 802.1q TCI value. */
 430         ODP_ACTION_ATTR_STRIP_VLAN,   /* Strip the 802.1q header. */
 431         ODP_ACTION_ATTR_SET_DL_SRC,   /* Ethernet source address. */
 432         ODP_ACTION_ATTR_SET_DL_DST,   /* Ethernet destination address. */
 433         ODP_ACTION_ATTR_SET_NW_SRC,   /* IPv4 source address. */
 434         ODP_ACTION_ATTR_SET_NW_DST,   /* IPv4 destination address. */
 435         ODP_ACTION_ATTR_SET_NW_TOS,   /* IP ToS/DSCP field (6 bits). */
 436         ODP_ACTION_ATTR_SET_TP_SRC,   /* TCP/UDP source port. */
 437         ODP_ACTION_ATTR_SET_TP_DST,   /* TCP/UDP destination port. */
 438         ODP_ACTION_ATTR_SET_TUNNEL,   /* Set the encapsulating tunnel ID. */
 439         ODP_ACTION_ATTR_SET_PRIORITY, /* Set skb->priority. */
 440         ODP_ACTION_ATTR_POP_PRIORITY, /* Restore original skb->priority. */
 441         ODP_ACTION_ATTR_DROP_SPOOFED_ARP, /* Drop ARPs with spoofed source MAC. */
 442         __ODP_ACTION_ATTR_MAX
 443 };
 444
 445 #define ODP_ACTION_ATTR_MAX (__ODP_ACTION_ATTR_MAX - 1)
 446
 447 #endif  /* openvswitch/datapath-protocol.h */