ovn/controller/lflow.c

   1 /* Copyright (c) 2015 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
  16 #include <config.h>
  17 #include "lflow.h"
  18 #include "dynamic-string.h"
  19 #include "ofctrl.h"
  20 #include "ofp-actions.h"
  21 #include "ofpbuf.h"
  22 #include "openvswitch/vlog.h"
  23 #include "ovn/controller/ovn-controller.h"
  24 #include "ovn/lib/actions.h"
  25 #include "ovn/lib/expr.h"
  26 #include "ovn/lib/ovn-sb-idl.h"
  27 #include "simap.h"
  28
  29 VLOG_DEFINE_THIS_MODULE(lflow);
  30 \f
  31 /* Symbol table. */
  32
  33 /* Contains "struct expr_symbol"s for fields supported by OVN lflows. */
  34 static struct shash symtab;
  35
  36 static void
  37 add_logical_register(struct shash *symtab, enum mf_field_id id)
  38 {
  39     char name[8];
  40
  41     snprintf(name, sizeof name, "reg%d", id - MFF_REG0);
  42     expr_symtab_add_field(symtab, name, id, NULL, false);
  43 }
  44
  45 static void
  46 symtab_init(void)
  47 {
  48     shash_init(&symtab);
  49
  50     /* Reserve a pair of registers for the logical inport and outport.  A full
  51      * 32-bit register each is bigger than we need, but the expression code
  52      * doesn't yet support string fields that occupy less than a full OXM. */
  53     expr_symtab_add_string(&symtab, "inport", MFF_LOG_INPORT, NULL);
  54     expr_symtab_add_string(&symtab, "outport", MFF_LOG_OUTPORT, NULL);
  55
  56     /* Logical registers. */
  57 #define MFF_LOG_REG(ID) add_logical_register(&symtab, ID);
  58     MFF_LOG_REGS;
  59 #undef MFF_LOG_REG
  60
  61     /* Data fields. */
  62     expr_symtab_add_field(&symtab, "eth.src", MFF_ETH_SRC, NULL, false);
  63     expr_symtab_add_field(&symtab, "eth.dst", MFF_ETH_DST, NULL, false);
  64     expr_symtab_add_field(&symtab, "eth.type", MFF_ETH_TYPE, NULL, true);
  65
  66     expr_symtab_add_field(&symtab, "vlan.tci", MFF_VLAN_TCI, NULL, false);
  67     expr_symtab_add_predicate(&symtab, "vlan.present", "vlan.tci[12]");
  68     expr_symtab_add_subfield(&symtab, "vlan.pcp", "vlan.present",
  69                              "vlan.tci[13..15]");
  70     expr_symtab_add_subfield(&symtab, "vlan.vid", "vlan.present",
  71                              "vlan.tci[0..11]");
  72
  73     expr_symtab_add_predicate(&symtab, "ip4", "eth.type == 0x800");
  74     expr_symtab_add_predicate(&symtab, "ip6", "eth.type == 0x86dd");
  75     expr_symtab_add_predicate(&symtab, "ip", "ip4 || ip6");
  76     expr_symtab_add_field(&symtab, "ip.proto", MFF_IP_PROTO, "ip", true);
  77     expr_symtab_add_field(&symtab, "ip.dscp", MFF_IP_DSCP, "ip", false);
  78     expr_symtab_add_field(&symtab, "ip.ecn", MFF_IP_ECN, "ip", false);
  79     expr_symtab_add_field(&symtab, "ip.ttl", MFF_IP_TTL, "ip", false);
  80
  81     expr_symtab_add_field(&symtab, "ip4.src", MFF_IPV4_SRC, "ip4", false);
  82     expr_symtab_add_field(&symtab, "ip4.dst", MFF_IPV4_DST, "ip4", false);
  83
  84     expr_symtab_add_predicate(&symtab, "icmp4", "ip4 && ip.proto == 1");
  85     expr_symtab_add_field(&symtab, "icmp4.type", MFF_ICMPV4_TYPE, "icmp4",
  86               false);
  87     expr_symtab_add_field(&symtab, "icmp4.code", MFF_ICMPV4_CODE, "icmp4",
  88               false);
  89
  90     expr_symtab_add_field(&symtab, "ip6.src", MFF_IPV6_SRC, "ip6", false);
  91     expr_symtab_add_field(&symtab, "ip6.dst", MFF_IPV6_DST, "ip6", false);
  92     expr_symtab_add_field(&symtab, "ip6.label", MFF_IPV6_LABEL, "ip6", false);
  93
  94     expr_symtab_add_predicate(&symtab, "icmp6", "ip6 && ip.proto == 58");
  95     expr_symtab_add_field(&symtab, "icmp6.type", MFF_ICMPV6_TYPE, "icmp6",
  96                           true);
  97     expr_symtab_add_field(&symtab, "icmp6.code", MFF_ICMPV6_CODE, "icmp6",
  98                           true);
  99
 100     expr_symtab_add_predicate(&symtab, "icmp", "icmp4 || icmp6");
 101
 102     expr_symtab_add_field(&symtab, "ip.frag", MFF_IP_FRAG, "ip", false);
 103     expr_symtab_add_predicate(&symtab, "ip.is_frag", "ip.frag[0]");
 104     expr_symtab_add_predicate(&symtab, "ip.later_frag", "ip.frag[1]");
 105     expr_symtab_add_predicate(&symtab, "ip.first_frag",
 106                               "ip.is_frag && !ip.later_frag");
 107
 108     expr_symtab_add_predicate(&symtab, "arp", "eth.type == 0x806");
 109     expr_symtab_add_field(&symtab, "arp.op", MFF_ARP_OP, "arp", false);
 110     expr_symtab_add_field(&symtab, "arp.spa", MFF_ARP_SPA, "arp", false);
 111     expr_symtab_add_field(&symtab, "arp.sha", MFF_ARP_SHA, "arp", false);
 112     expr_symtab_add_field(&symtab, "arp.tpa", MFF_ARP_TPA, "arp", false);
 113     expr_symtab_add_field(&symtab, "arp.tha", MFF_ARP_THA, "arp", false);
 114
 115     expr_symtab_add_predicate(&symtab, "nd",
 116                               "icmp6.type == {135, 136} && icmp6.code == 0");
 117     expr_symtab_add_field(&symtab, "nd.target", MFF_ND_TARGET, "nd", false);
 118     expr_symtab_add_field(&symtab, "nd.sll", MFF_ND_SLL,
 119               "nd && icmp6.type == 135", false);
 120     expr_symtab_add_field(&symtab, "nd.tll", MFF_ND_TLL,
 121               "nd && icmp6.type == 136", false);
 122
 123     expr_symtab_add_predicate(&symtab, "tcp", "ip.proto == 6");
 124     expr_symtab_add_field(&symtab, "tcp.src", MFF_TCP_SRC, "tcp", false);
 125     expr_symtab_add_field(&symtab, "tcp.dst", MFF_TCP_DST, "tcp", false);
 126     expr_symtab_add_field(&symtab, "tcp.flags", MFF_TCP_FLAGS, "tcp", false);
 127
 128     expr_symtab_add_predicate(&symtab, "udp", "ip.proto == 17");
 129     expr_symtab_add_field(&symtab, "udp.src", MFF_UDP_SRC, "udp", false);
 130     expr_symtab_add_field(&symtab, "udp.dst", MFF_UDP_DST, "udp", false);
 131
 132     expr_symtab_add_predicate(&symtab, "sctp", "ip.proto == 132");
 133     expr_symtab_add_field(&symtab, "sctp.src", MFF_SCTP_SRC, "sctp", false);
 134     expr_symtab_add_field(&symtab, "sctp.dst", MFF_SCTP_DST, "sctp", false);
 135 }
 136 \f
 137 /* Logical datapaths and logical port numbers. */
 138
 139 /* A logical datapath.
 140  *
 141  * 'ports' maps 'logical_port' names to 'tunnel_key' values in the OVN_SB
 142  * Port_Binding table within the logical datapath. */
 143 struct logical_datapath {
 144     struct hmap_node hmap_node; /* Indexed on 'uuid'. */
 145     struct uuid uuid;           /* UUID from Datapath_Binding row. */
 146     uint32_t tunnel_key;        /* 'tunnel_key' from Datapath_Binding row. */
 147     struct simap ports;         /* Logical port name to port number. */
 148 };
 149
 150 /* Contains "struct logical_datapath"s. */
 151 static struct hmap logical_datapaths = HMAP_INITIALIZER(&logical_datapaths);
 152
 153 /* Finds and returns the logical_datapath for 'binding', or NULL if no such
 154  * logical_datapath exists. */
 155 static struct logical_datapath *
 156 ldp_lookup(const struct sbrec_datapath_binding *binding)
 157 {
 158     struct logical_datapath *ldp;
 159     HMAP_FOR_EACH_IN_BUCKET (ldp, hmap_node, uuid_hash(&binding->header_.uuid),
 160                              &logical_datapaths) {
 161         if (uuid_equals(&ldp->uuid, &binding->header_.uuid)) {
 162             return ldp;
 163         }
 164     }
 165     return NULL;
 166 }
 167
 168 /* Creates a new logical_datapath for the given 'binding'. */
 169 static struct logical_datapath *
 170 ldp_create(const struct sbrec_datapath_binding *binding)
 171 {
 172     struct logical_datapath *ldp;
 173
 174     ldp = xmalloc(sizeof *ldp);
 175     hmap_insert(&logical_datapaths, &ldp->hmap_node,
 176                 uuid_hash(&binding->header_.uuid));
 177     ldp->uuid = binding->header_.uuid;
 178     ldp->tunnel_key = binding->tunnel_key;
 179     simap_init(&ldp->ports);
 180     return ldp;
 181 }
 182
 183 static struct logical_datapath *
 184 ldp_lookup_or_create(const struct sbrec_datapath_binding *binding)
 185 {
 186     struct logical_datapath *ldp = ldp_lookup(binding);
 187     return ldp ? ldp : ldp_create(binding);
 188 }
 189
 190 static void
 191 ldp_free(struct logical_datapath *ldp)
 192 {
 193     simap_destroy(&ldp->ports);
 194     hmap_remove(&logical_datapaths, &ldp->hmap_node);
 195     free(ldp);
 196 }
 197
 198 /* Iterates through all of the records in the Port_Binding table, updating the
 199  * table of logical_datapaths to match the values found in active
 200  * Port_Bindings. */
 201 static void
 202 ldp_run(struct controller_ctx *ctx)
 203 {
 204     struct logical_datapath *ldp;
 205     HMAP_FOR_EACH (ldp, hmap_node, &logical_datapaths) {
 206         simap_clear(&ldp->ports);
 207     }
 208
 209     const struct sbrec_port_binding *binding;
 210     SBREC_PORT_BINDING_FOR_EACH (binding, ctx->ovnsb_idl) {
 211         struct logical_datapath *ldp = ldp_lookup_or_create(binding->datapath);
 212
 213         simap_put(&ldp->ports, binding->logical_port, binding->tunnel_key);
 214     }
 215
 216     const struct sbrec_multicast_group *mc;
 217     SBREC_MULTICAST_GROUP_FOR_EACH (mc, ctx->ovnsb_idl) {
 218         struct logical_datapath *ldp = ldp_lookup_or_create(mc->datapath);
 219         simap_put(&ldp->ports, mc->name, mc->tunnel_key);
 220     }
 221
 222     struct logical_datapath *next_ldp;
 223     HMAP_FOR_EACH_SAFE (ldp, next_ldp, hmap_node, &logical_datapaths) {
 224         if (simap_is_empty(&ldp->ports)) {
 225             ldp_free(ldp);
 226         }
 227     }
 228 }
 229
 230 static void
 231 ldp_destroy(void)
 232 {
 233     struct logical_datapath *ldp, *next_ldp;
 234     HMAP_FOR_EACH_SAFE (ldp, next_ldp, hmap_node, &logical_datapaths) {
 235         ldp_free(ldp);
 236     }
 237 }
 238 \f
 239 void
 240 lflow_init(void)
 241 {
 242     symtab_init();
 243 }
 244
 245 /* Translates logical flows in the Logical_Flow table in the OVN_SB database
 246  * into OpenFlow flows.  See ovn-architecture(7) for more information. */
 247 void
 248 lflow_run(struct controller_ctx *ctx, struct hmap *flow_table)
 249 {
 250     struct hmap flows = HMAP_INITIALIZER(&flows);
 251     uint32_t conj_id_ofs = 1;
 252
 253     ldp_run(ctx);
 254
 255     const struct sbrec_logical_flow *lflow;
 256     SBREC_LOGICAL_FLOW_FOR_EACH (lflow, ctx->ovnsb_idl) {
 257         /* Find the "struct logical_datapath" asssociated with this
 258          * Logical_Flow row.  If there's no such struct, that must be because
 259          * no logical ports are bound to that logical datapath, so there's no
 260          * point in maintaining any flows for it anyway, so skip it. */
 261         const struct logical_datapath *ldp;
 262         ldp = ldp_lookup(lflow->logical_datapath);
 263         if (!ldp) {
 264             continue;
 265         }
 266
 267         /* Determine translation of logical table IDs to physical table IDs. */
 268         bool ingress = !strcmp(lflow->pipeline, "ingress");
 269         uint8_t first_ptable = (ingress
 270                                 ? OFTABLE_LOG_INGRESS_PIPELINE
 271                                 : OFTABLE_LOG_EGRESS_PIPELINE);
 272         uint8_t ptable = first_ptable + lflow->table_id;
 273         uint8_t output_ptable = (ingress
 274                                  ? OFTABLE_REMOTE_OUTPUT
 275                                  : OFTABLE_LOG_TO_PHY);
 276
 277         /* Translate OVN actions into OpenFlow actions.
 278          *
 279          * XXX Deny changes to 'outport' in egress pipeline. */
 280         uint64_t ofpacts_stub[64 / 8];
 281         struct ofpbuf ofpacts;
 282         struct expr *prereqs;
 283         char *error;
 284
 285         ofpbuf_use_stub(&ofpacts, ofpacts_stub, sizeof ofpacts_stub);
 286         error = actions_parse_string(lflow->actions, &symtab, &ldp->ports,
 287                                      first_ptable, LOG_PIPELINE_LEN,
 288                                      lflow->table_id, output_ptable,
 289                                      &ofpacts, &prereqs);
 290         if (error) {
 291             static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1);
 292             VLOG_WARN_RL(&rl, "error parsing actions \"%s\": %s",
 293                          lflow->actions, error);
 294             free(error);
 295             continue;
 296         }
 297
 298         /* Translate OVN match into table of OpenFlow matches. */
 299         struct hmap matches;
 300         struct expr *expr;
 301
 302         expr = expr_parse_string(lflow->match, &symtab, &error);
 303         if (!error) {
 304             if (prereqs) {
 305                 expr = expr_combine(EXPR_T_AND, expr, prereqs);
 306                 prereqs = NULL;
 307             }
 308             expr = expr_annotate(expr, &symtab, &error);
 309         }
 310         if (error) {
 311             static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1);
 312             VLOG_WARN_RL(&rl, "error parsing match \"%s\": %s",
 313                          lflow->match, error);
 314             expr_destroy(prereqs);
 315             ofpbuf_uninit(&ofpacts);
 316             free(error);
 317             continue;
 318         }
 319
 320         expr = expr_simplify(expr);
 321         expr = expr_normalize(expr);
 322         uint32_t n_conjs = expr_to_matches(expr, &ldp->ports, &matches);
 323         expr_destroy(expr);
 324
 325         /* Prepare the OpenFlow matches for adding to the flow table. */
 326         struct expr_match *m;
 327         HMAP_FOR_EACH (m, hmap_node, &matches) {
 328             match_set_metadata(&m->match, htonll(ldp->tunnel_key));
 329             if (m->match.wc.masks.conj_id) {
 330                 m->match.flow.conj_id += conj_id_ofs;
 331             }
 332             if (!m->n) {
 333                 ofctrl_add_flow(flow_table, ptable, lflow->priority,
 334                                 &m->match, &ofpacts);
 335             } else {
 336                 uint64_t conj_stubs[64 / 8];
 337                 struct ofpbuf conj;
 338
 339                 ofpbuf_use_stub(&conj, conj_stubs, sizeof conj_stubs);
 340                 for (int i = 0; i < m->n; i++) {
 341                     const struct cls_conjunction *src = &m->conjunctions[i];
 342                     struct ofpact_conjunction *dst;
 343
 344                     dst = ofpact_put_CONJUNCTION(&conj);
 345                     dst->id = src->id + conj_id_ofs;
 346                     dst->clause = src->clause;
 347                     dst->n_clauses = src->n_clauses;
 348                 }
 349                 ofctrl_add_flow(flow_table, ptable, lflow->priority,
 350                                 &m->match, &conj);
 351                 ofpbuf_uninit(&conj);
 352             }
 353         }
 354
 355         /* Clean up. */
 356         expr_matches_destroy(&matches);
 357         ofpbuf_uninit(&ofpacts);
 358         conj_id_ofs += n_conjs;
 359     }
 360 }
 361
 362 void
 363 lflow_destroy(void)
 364 {
 365     expr_symtab_destroy(&symtab);
 366     ldp_destroy();
 367 }