ofproto/ofproto-dpif-xlate.h

   1 /* Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 Nicira, Inc.
   2  *
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License. */
  14
  15 #ifndef OFPROTO_DPIF_XLATE_H
  16 #define OFPROTO_DPIF_XLATE_H 1
  17
  18 #include "dp-packet.h"
  19 #include "flow.h"
  20 #include "meta-flow.h"
  21 #include "odp-util.h"
  22 #include "ofpbuf.h"
  23 #include "ofproto-dpif-mirror.h"
  24 #include "ofproto-dpif-rid.h"
  25 #include "ofproto-dpif.h"
  26 #include "ofproto.h"
  27 #include "stp.h"
  28 #include "ovs-lldp.h"
  29
  30 struct bfd;
  31 struct bond;
  32 struct dpif;
  33 struct lacp;
  34 struct dpif_ipfix;
  35 struct dpif_sflow;
  36 struct mac_learning;
  37 struct mcast_snooping;
  38 struct xlate_cache;
  39
  40 struct xlate_out {
  41     enum slow_path_reason slow; /* 0 if fast path may be used. */
  42
  43     struct recirc_refs recircs; /* Recirc action IDs on which references are
  44                                  * held. */
  45 };
  46
  47 struct xlate_in {
  48     struct ofproto_dpif *ofproto;
  49
  50     /* Flow to which the OpenFlow actions apply.  xlate_actions() will modify
  51      * this flow when actions change header fields. */
  52     struct flow flow;
  53
  54     /* The packet corresponding to 'flow', or a null pointer if we are
  55      * revalidating without a packet to refer to. */
  56     const struct dp_packet *packet;
  57
  58     /* Should OFPP_NORMAL update the MAC learning table?  Should "learn"
  59      * actions update the flow table?
  60      *
  61      * We want to update these tables if we are actually processing a packet,
  62      * or if we are accounting for packets that the datapath has processed, but
  63      * not if we are just revalidating. */
  64     bool may_learn;
  65
  66     /* The rule initiating translation or NULL. If both 'rule' and 'ofpacts'
  67      * are NULL, xlate_actions() will do the initial rule lookup itself. */
  68     struct rule_dpif *rule;
  69
  70     /* The actions to translate.  If 'rule' is not NULL, these may be NULL. */
  71     const struct ofpact *ofpacts;
  72     size_t ofpacts_len;
  73
  74     /* Union of the set of TCP flags seen so far in this flow.  (Used only by
  75      * NXAST_FIN_TIMEOUT.  Set to zero to avoid updating updating rules'
  76      * timeouts.) */
  77     uint16_t tcp_flags;
  78
  79     /* If nonnull, flow translation calls this function just before executing a
  80      * resubmit or OFPP_TABLE action.  In addition, disables logging of traces
  81      * when the recursion depth is exceeded.
  82      *
  83      * 'rule' is the rule being submitted into.  It will be null if the
  84      * resubmit or OFPP_TABLE action didn't find a matching rule.
  85      *
  86      * 'recurse' is the resubmit recursion depth at time of invocation.
  87      *
  88      * This is normally null so the client has to set it manually after
  89      * calling xlate_in_init(). */
  90     void (*resubmit_hook)(struct xlate_in *, struct rule_dpif *rule,
  91                           int recurse);
  92
  93     /* If nonnull, flow translation calls this function to report some
  94      * significant decision, e.g. to explain why OFPP_NORMAL translation
  95      * dropped a packet.  'recurse' is the resubmit recursion depth at time of
  96      * invocation. */
  97     void (*report_hook)(struct xlate_in *, int recurse,
  98                         const char *format, va_list args);
  99
 100     /* If nonnull, flow translation credits the specified statistics to each
 101      * rule reached through a resubmit or OFPP_TABLE action.
 102      *
 103      * This is normally null so the client has to set it manually after
 104      * calling xlate_in_init(). */
 105     const struct dpif_flow_stats *resubmit_stats;
 106
 107     /* Recursion and resubmission levels carried over from a pre-existing
 108      * translation of a related flow. An example of when this can occur is
 109      * the translation of an ARP packet that was generated as the result of
 110      * outputting to a tunnel port. In this case, the original flow going to
 111      * the tunnel is the related flow. Since the two flows are different, they
 112      * should not use the same xlate_ctx structure. However, we still need
 113      * limit the maximum recursion across the entire translation.
 114      *
 115      * These fields are normally set to zero, so the client has to set them
 116      * manually after calling xlate_in_init(). In that case, they should be
 117      * copied from the same-named fields in the related flow's xlate_ctx. */
 118     int recurse;
 119     int resubmits;
 120
 121     /* If nonnull, flow translation populates this cache with references to all
 122      * modules that are affected by translation. This 'xlate_cache' may be
 123      * passed to xlate_push_stats() to perform the same function as
 124      * xlate_actions() without the full cost of translation.
 125      *
 126      * This is normally null so the client has to set it manually after
 127      * calling xlate_in_init(). */
 128     struct xlate_cache *xcache;
 129
 130     /* If nonnull, flow translation puts the resulting datapath actions in this
 131      * buffer.  If null, flow translation will not produce datapath actions. */
 132     struct ofpbuf *odp_actions;
 133
 134     /* If nonnull, flow translation populates this with wildcards relevant in
 135      * translation.  Any fields that were used to calculate the action are set,
 136      * to allow caching and kernel wildcarding to work.  For example, if the
 137      * flow lookup involved performing the "normal" action on IPv4 and ARP
 138      * packets, 'wc' would have the 'in_port' (always set), 'dl_type' (flow
 139      * match), 'vlan_tci' (normal action), and 'dl_dst' (normal action) fields
 140      * set. */
 141     struct flow_wildcards *wc;
 142
 143     /* The frozen state to be resumed, as returned by xlate_lookup(). */
 144     const struct frozen_state *frozen_state;
 145 };
 146
 147 void xlate_ofproto_set(struct ofproto_dpif *, const char *name, struct dpif *,
 148                        const struct mac_learning *, struct stp *,
 149                        struct rstp *, const struct mcast_snooping *,
 150                        const struct mbridge *, const struct dpif_sflow *,
 151                        const struct dpif_ipfix *, const struct netflow *,
 152                        bool forward_bpdu, bool has_in_band,
 153                        const struct dpif_backer_support *support);
 154 void xlate_remove_ofproto(struct ofproto_dpif *);
 155
 156 void xlate_bundle_set(struct ofproto_dpif *, struct ofbundle *,
 157                       const char *name, enum port_vlan_mode, int vlan,
 158                       unsigned long *trunks, bool use_priority_tags,
 159                       const struct bond *, const struct lacp *,
 160                       bool floodable);
 161 void xlate_bundle_remove(struct ofbundle *);
 162
 163 void xlate_ofport_set(struct ofproto_dpif *, struct ofbundle *,
 164                       struct ofport_dpif *, ofp_port_t, odp_port_t,
 165                       const struct netdev *, const struct cfm *, const struct bfd *,
 166                       const struct lldp *, struct ofport_dpif *peer,
 167                       int stp_port_no, const struct rstp_port *rstp_port,
 168                       const struct ofproto_port_queue *qdscp,
 169                       size_t n_qdscp, enum ofputil_port_config,
 170                       enum ofputil_port_state, bool is_tunnel,
 171                       bool may_enable);
 172 void xlate_ofport_remove(struct ofport_dpif *);
 173
 174 struct ofproto_dpif * xlate_lookup_ofproto(const struct dpif_backer *,
 175                                            const struct flow *,
 176                                            ofp_port_t *ofp_in_port);
 177 int xlate_lookup(const struct dpif_backer *, const struct flow *,
 178                  struct ofproto_dpif **, struct dpif_ipfix **,
 179                  struct dpif_sflow **, struct netflow **,
 180                  ofp_port_t *ofp_in_port);
 181
 182 enum xlate_error {
 183     XLATE_OK = 0,
 184     XLATE_BRIDGE_NOT_FOUND,
 185     XLATE_RECURSION_TOO_DEEP,
 186     XLATE_TOO_MANY_RESUBMITS,
 187     XLATE_STACK_TOO_DEEP,
 188     XLATE_NO_RECIRCULATION_CONTEXT,
 189     XLATE_RECIRCULATION_CONFLICT,
 190     XLATE_TOO_MANY_MPLS_LABELS,
 191 };
 192
 193 const char *xlate_strerror(enum xlate_error error);
 194
 195 enum xlate_error xlate_actions(struct xlate_in *, struct xlate_out *);
 196
 197 void xlate_in_init(struct xlate_in *, struct ofproto_dpif *,
 198                    const struct flow *, ofp_port_t in_port, struct rule_dpif *,
 199                    uint16_t tcp_flags, const struct dp_packet *packet,
 200                    struct flow_wildcards *, struct ofpbuf *odp_actions);
 201 void xlate_out_uninit(struct xlate_out *);
 202 void xlate_actions_for_side_effects(struct xlate_in *);
 203
 204 enum ofperr xlate_resume(struct ofproto_dpif *,
 205                          const struct ofputil_packet_in_private *,
 206                          struct ofpbuf *odp_actions, enum slow_path_reason *);
 207
 208 int xlate_send_packet(const struct ofport_dpif *, struct dp_packet *);
 209
 210 struct xlate_cache *xlate_cache_new(void);
 211 void xlate_push_stats(struct xlate_cache *, const struct dpif_flow_stats *);
 212 void xlate_cache_clear(struct xlate_cache *);
 213 void xlate_cache_delete(struct xlate_cache *);
 214
 215 void xlate_txn_start(void);
 216 void xlate_txn_commit(void);
 217
 218 #endif /* ofproto-dpif-xlate.h */