lib/odp-util.h

   1 /*
   2  * Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014, 2015 Nicira, Inc.
   3  *
   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:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  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.
  15  */
  16
  17 #ifndef ODP_UTIL_H
  18 #define ODP_UTIL_H 1
  19
  20 #include <stdbool.h>
  21 #include <stddef.h>
  22 #include <stdint.h>
  23 #include <string.h>
  24 #include "flow.h"
  25 #include "hash.h"
  26 #include "hmap.h"
  27 #include "odp-netlink.h"
  28 #include "openflow/openflow.h"
  29 #include "util.h"
  30
  31 struct ds;
  32 struct nlattr;
  33 struct ofpbuf;
  34 struct simap;
  35 struct pkt_metadata;
  36
  37 #define SLOW_PATH_REASONS                                               \
  38     /* These reasons are mutually exclusive. */                         \
  39     SPR(SLOW_CFM,        "cfm",        "Consists of CFM packets")       \
  40     SPR(SLOW_BFD,        "bfd",        "Consists of BFD packets")       \
  41     SPR(SLOW_LACP,       "lacp",       "Consists of LACP packets")      \
  42     SPR(SLOW_STP,        "stp",        "Consists of STP packets")       \
  43     SPR(SLOW_LLDP,       "lldp",       "Consists of LLDP packets")    \
  44     SPR(SLOW_CONTROLLER, "controller",                                  \
  45         "Sends \"packet-in\" messages to the OpenFlow controller")      \
  46     SPR(SLOW_ACTION,     "action",                                      \
  47         "Uses action(s) not supported by datapath")
  48
  49 /* Indexes for slow-path reasons.  Client code uses "enum slow_path_reason"
  50  * values instead of these, these are just a way to construct those. */
  51 enum {
  52 #define SPR(ENUM, STRING, EXPLANATION) ENUM##_INDEX,
  53     SLOW_PATH_REASONS
  54 #undef SPR
  55 };
  56
  57 /* Reasons why a subfacet might not be fast-pathable.
  58  *
  59  * Each reason is a separate bit to allow reasons to be combined. */
  60 enum slow_path_reason {
  61 #define SPR(ENUM, STRING, EXPLANATION) ENUM = 1 << ENUM##_INDEX,
  62     SLOW_PATH_REASONS
  63 #undef SPR
  64 };
  65
  66 /* Mask of all slow_path_reasons. */
  67 enum {
  68     SLOW_PATH_REASON_MASK = 0
  69 #define SPR(ENUM, STRING, EXPLANATION) | 1 << ENUM##_INDEX
  70     SLOW_PATH_REASONS
  71 #undef SPR
  72 };
  73
  74 const char *slow_path_reason_to_explanation(enum slow_path_reason);
  75
  76 #define ODPP_LOCAL ODP_PORT_C(OVSP_LOCAL)
  77 #define ODPP_NONE  ODP_PORT_C(UINT32_MAX)
  78
  79 void format_odp_actions(struct ds *, const struct nlattr *odp_actions,
  80                         size_t actions_len);
  81 int odp_actions_from_string(const char *, const struct simap *port_names,
  82                             struct ofpbuf *odp_actions);
  83
  84 /* A map from odp port number to its name. */
  85 struct odp_portno_names {
  86     struct hmap_node hmap_node; /* A node in a port number to name hmap. */
  87     odp_port_t port_no;         /* Port number in the datapath. */
  88     char *name;                 /* Name associated with the above 'port_no'. */
  89 };
  90
  91 void odp_portno_names_set(struct hmap *portno_names, odp_port_t port_no,
  92                           char *port_name);
  93 void odp_portno_names_destroy(struct hmap *portno_names);
  94 /* The maximum number of bytes that odp_flow_key_from_flow() appends to a
  95  * buffer.  This is the upper bound on the length of a nlattr-formatted flow
  96  * key that ovs-vswitchd fully understands.
  97  *
  98  * OVS doesn't insist that ovs-vswitchd and the datapath have exactly the same
  99  * idea of a flow, so therefore this value isn't necessarily an upper bound on
 100  * the length of a flow key that the datapath can pass to ovs-vswitchd.
 101  *
 102  * The longest nlattr-formatted flow key appended by odp_flow_key_from_flow()
 103  * would be:
 104  *
 105  *                                     struct  pad  nl hdr  total
 106  *                                     ------  ---  ------  -----
 107  *  OVS_KEY_ATTR_PRIORITY                4    --     4      8
 108  *  OVS_KEY_ATTR_TUNNEL                  0    --     4      4
 109  *  - OVS_TUNNEL_KEY_ATTR_ID             8    --     4     12
 110  *  - OVS_TUNNEL_KEY_ATTR_IPV4_SRC       4    --     4      8
 111  *  - OVS_TUNNEL_KEY_ATTR_IPV4_DST       4    --     4      8
 112  *  - OVS_TUNNEL_KEY_ATTR_TOS            1    3      4      8
 113  *  - OVS_TUNNEL_KEY_ATTR_TTL            1    3      4      8
 114  *  - OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT  0    --     4      4
 115  *  - OVS_TUNNEL_KEY_ATTR_CSUM           0    --     4      4
 116  *  - OVS_TUNNEL_KEY_ATTR_OAM            0    --     4      4
 117  *  - OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS    256  --     4      260
 118  *  - OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS     -    --     -      - (shared with _GENEVE_OPTS)
 119  *  OVS_KEY_ATTR_IN_PORT                 4    --     4      8
 120  *  OVS_KEY_ATTR_SKB_MARK                4    --     4      8
 121  *  OVS_KEY_ATTR_DP_HASH                 4    --     4      8
 122  *  OVS_KEY_ATTR_RECIRC_ID               4    --     4      8
 123  *  OVS_KEY_ATTR_ETHERNET               12    --     4     16
 124  *  OVS_KEY_ATTR_ETHERTYPE               2     2     4      8  (outer VLAN ethertype)
 125  *  OVS_KEY_ATTR_VLAN                    2     2     4      8
 126  *  OVS_KEY_ATTR_ENCAP                   0    --     4      4  (VLAN encapsulation)
 127  *  OVS_KEY_ATTR_ETHERTYPE               2     2     4      8  (inner VLAN ethertype)
 128  *  OVS_KEY_ATTR_IPV6                   40    --     4     44
 129  *  OVS_KEY_ATTR_ICMPV6                  2     2     4      8
 130  *  OVS_KEY_ATTR_ND                     28    --     4     32
 131  *  ----------------------------------------------------------
 132  *  total                                                 488
 133  *
 134  * We include some slack space in case the calculation isn't quite right or we
 135  * add another field and forget to adjust this value.
 136  */
 137 #define ODPUTIL_FLOW_KEY_BYTES 512
 138 BUILD_ASSERT_DECL(FLOW_WC_SEQ == 32);
 139
 140 /* A buffer with sufficient size and alignment to hold an nlattr-formatted flow
 141  * key.  An array of "struct nlattr" might not, in theory, be sufficiently
 142  * aligned because it only contains 16-bit types. */
 143 struct odputil_keybuf {
 144     uint32_t keybuf[DIV_ROUND_UP(ODPUTIL_FLOW_KEY_BYTES, 4)];
 145 };
 146
 147 enum odp_key_fitness odp_tun_key_from_attr(const struct nlattr *,
 148                                            struct flow_tnl *);
 149
 150 int odp_ufid_from_string(const char *s_, ovs_u128 *ufid);
 151 void odp_format_ufid(const ovs_u128 *ufid, struct ds *);
 152 void odp_flow_format(const struct nlattr *key, size_t key_len,
 153                      const struct nlattr *mask, size_t mask_len,
 154                      const struct hmap *portno_names, struct ds *,
 155                      bool verbose);
 156 void odp_flow_key_format(const struct nlattr *, size_t, struct ds *);
 157 int odp_flow_from_string(const char *s,
 158                          const struct simap *port_names,
 159                          struct ofpbuf *, struct ofpbuf *);
 160
 161 struct odp_flow_key_parms {
 162     /* The flow and mask to be serialized. In the case of masks, 'flow'
 163      * is used as a template to determine how to interpret 'mask'.  For
 164      * example, the 'dl_type' of 'mask' describes the mask, but it doesn't
 165      * indicate whether the other fields should be interpreted as ARP, IPv4,
 166      * IPv6, etc. */
 167     const struct flow *flow;
 168     const struct flow *mask;
 169
 170    /* 'flow->in_port' is ignored (since it is likely to be an OpenFlow port
 171     * number rather than a datapath port number).  Instead, if 'odp_in_port'
 172     * is anything other than ODPP_NONE, it is included in 'buf' as the input
 173     * port. */
 174     odp_port_t odp_in_port;
 175
 176     /* Indicates support for recirculation fields. If this is true, then
 177      * these fields will always be serialised. */
 178     bool recirc;
 179
 180     /* Only used for mask translation: */
 181
 182     size_t max_mpls_depth;
 183
 184     /* The netlink formatted version of the flow. It is used in cases where
 185      * the mask cannot be constructed from the OVS internal representation
 186      * and needs to see the original form. */
 187     const struct ofpbuf *key_buf;
 188 };
 189
 190 void odp_flow_key_from_flow(const struct odp_flow_key_parms *, struct ofpbuf *);
 191 void odp_flow_key_from_mask(const struct odp_flow_key_parms *, struct ofpbuf *);
 192
 193 uint32_t odp_flow_key_hash(const struct nlattr *, size_t);
 194
 195 /* Estimated space needed for metadata. */
 196 enum { ODP_KEY_METADATA_SIZE = 9 * 8 };
 197 void odp_key_from_pkt_metadata(struct ofpbuf *, const struct pkt_metadata *);
 198 void odp_key_to_pkt_metadata(const struct nlattr *key, size_t key_len,
 199                               struct pkt_metadata *md);
 200
 201 /* How well a kernel-provided flow key (a sequence of OVS_KEY_ATTR_*
 202  * attributes) matches OVS userspace expectations.
 203  *
 204  * These values are arranged so that greater values are "more important" than
 205  * lesser ones.  In particular, a single flow key can fit the descriptions for
 206  * both ODP_FIT_TOO_LITTLE and ODP_FIT_TOO_MUCH.  Such a key is treated as
 207  * ODP_FIT_TOO_LITTLE. */
 208 enum odp_key_fitness {
 209     ODP_FIT_PERFECT,            /* The key had exactly the fields we expect. */
 210     ODP_FIT_TOO_MUCH,           /* The key had fields we don't understand. */
 211     ODP_FIT_TOO_LITTLE,         /* The key lacked fields we expected to see. */
 212     ODP_FIT_ERROR,              /* The key was invalid. */
 213 };
 214 enum odp_key_fitness odp_flow_key_to_flow(const struct nlattr *, size_t,
 215                                           struct flow *);
 216 enum odp_key_fitness odp_flow_key_to_mask(const struct nlattr *mask_key,
 217                                           size_t mask_key_len,
 218                                           const struct nlattr *flow_key,
 219                                           size_t flow_key_len,
 220                                           struct flow *mask,
 221                                           const struct flow *flow);
 222 const char *odp_key_fitness_to_string(enum odp_key_fitness);
 223
 224 void commit_odp_tunnel_action(const struct flow *, struct flow *base,
 225                               struct ofpbuf *odp_actions);
 226 void commit_masked_set_action(struct ofpbuf *odp_actions,
 227                               enum ovs_key_attr key_type, const void *key,
 228                               const void *mask, size_t key_size);
 229 enum slow_path_reason commit_odp_actions(const struct flow *,
 230                                          struct flow *base,
 231                                          struct ofpbuf *odp_actions,
 232                                          struct flow_wildcards *wc,
 233                                          bool use_masked);
 234 \f
 235 /* ofproto-dpif interface.
 236  *
 237  * The following types and functions are logically part of ofproto-dpif.
 238  * ofproto-dpif puts values of these types into the flows that it installs in
 239  * the kernel datapath, though, so ovs-dpctl needs to interpret them so that
 240  * it can print flows in a more human-readable manner. */
 241
 242 enum user_action_cookie_type {
 243     USER_ACTION_COOKIE_UNSPEC,
 244     USER_ACTION_COOKIE_SFLOW,        /* Packet for per-bridge sFlow sampling. */
 245     USER_ACTION_COOKIE_SLOW_PATH,    /* Userspace must process this flow. */
 246     USER_ACTION_COOKIE_FLOW_SAMPLE,  /* Packet for per-flow sampling. */
 247     USER_ACTION_COOKIE_IPFIX,        /* Packet for per-bridge IPFIX sampling. */
 248 };
 249
 250 /* user_action_cookie is passed as argument to OVS_ACTION_ATTR_USERSPACE.
 251  * Since it is passed to kernel as u64, its size has to be 8 bytes. */
 252 union user_action_cookie {
 253     uint16_t type;              /* enum user_action_cookie_type. */
 254
 255     struct {
 256         uint16_t type;          /* USER_ACTION_COOKIE_SFLOW. */
 257         ovs_be16 vlan_tci;      /* Destination VLAN TCI. */
 258         uint32_t output;        /* SFL_FLOW_SAMPLE_TYPE 'output' value. */
 259     } sflow;
 260
 261     struct {
 262         uint16_t type;          /* USER_ACTION_COOKIE_SLOW_PATH. */
 263         uint16_t unused;
 264         uint32_t reason;        /* enum slow_path_reason. */
 265     } slow_path;
 266
 267     struct {
 268         uint16_t type;          /* USER_ACTION_COOKIE_FLOW_SAMPLE. */
 269         uint16_t probability;   /* Sampling probability. */
 270         uint32_t collector_set_id; /* ID of IPFIX collector set. */
 271         uint32_t obs_domain_id; /* Observation Domain ID. */
 272         uint32_t obs_point_id;  /* Observation Point ID. */
 273     } flow_sample;
 274
 275     struct {
 276         uint16_t   type;            /* USER_ACTION_COOKIE_IPFIX. */
 277         odp_port_t output_odp_port; /* The output odp port. */
 278     } ipfix;
 279 };
 280 BUILD_ASSERT_DECL(sizeof(union user_action_cookie) == 16);
 281
 282 size_t odp_put_userspace_action(uint32_t pid,
 283                                 const void *userdata, size_t userdata_size,
 284                                 odp_port_t tunnel_out_port,
 285                                 struct ofpbuf *odp_actions);
 286 void odp_put_tunnel_action(const struct flow_tnl *tunnel,
 287                            struct ofpbuf *odp_actions);
 288
 289 void odp_put_tnl_push_action(struct ofpbuf *odp_actions,
 290                              struct ovs_action_push_tnl *data);
 291 #endif /* odp-util.h */