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 "packets.h"
  28 #include "simap.h"
  29
  30 VLOG_DEFINE_THIS_MODULE(lflow);
  31 \f
  32 /* Symbol table. */
  33
  34 /* Contains "struct expr_symbol"s for fields supported by OVN lflows. */
  35 static struct shash symtab;
  36
  37 static void
  38 add_logical_register(struct shash *symtab, enum mf_field_id id)
  39 {
  40     char name[8];
  41
  42     snprintf(name, sizeof name, "reg%d", id - MFF_REG0);
  43     expr_symtab_add_field(symtab, name, id, NULL, false);
  44 }
  45
  46 static void
  47 symtab_init(void)
  48 {
  49     shash_init(&symtab);
  50
  51     /* Reserve a pair of registers for the logical inport and outport.  A full
  52      * 32-bit register each is bigger than we need, but the expression code
  53      * doesn't yet support string fields that occupy less than a full OXM. */
  54     expr_symtab_add_string(&symtab, "inport", MFF_LOG_INPORT, NULL);
  55     expr_symtab_add_string(&symtab, "outport", MFF_LOG_OUTPORT, NULL);
  56
  57     /* Logical registers. */
  58 #define MFF_LOG_REG(ID) add_logical_register(&symtab, ID);
  59     MFF_LOG_REGS;
  60 #undef MFF_LOG_REG
  61
  62     /* Connection tracking state. */
  63     expr_symtab_add_field(&symtab, "ct_state", MFF_CT_STATE, NULL, false);
  64     char ct_state_str[16];
  65     snprintf(ct_state_str, sizeof ct_state_str, "ct_state[%d]", CS_TRACKED_BIT);
  66     expr_symtab_add_predicate(&symtab, "ct.trk", ct_state_str);
  67     snprintf(ct_state_str, sizeof ct_state_str, "ct_state[%d]", CS_NEW_BIT);
  68     expr_symtab_add_subfield(&symtab, "ct.new", "ct.trk", ct_state_str);
  69     snprintf(ct_state_str, sizeof ct_state_str, "ct_state[%d]", CS_ESTABLISHED_BIT);
  70     expr_symtab_add_subfield(&symtab, "ct.est", "ct.trk", ct_state_str);
  71     snprintf(ct_state_str, sizeof ct_state_str, "ct_state[%d]", CS_RELATED_BIT);
  72     expr_symtab_add_subfield(&symtab, "ct.rel", "ct.trk", ct_state_str);
  73     snprintf(ct_state_str, sizeof ct_state_str, "ct_state[%d]", CS_REPLY_DIR_BIT);
  74     expr_symtab_add_subfield(&symtab, "ct.rpl", "ct.trk", ct_state_str);
  75     snprintf(ct_state_str, sizeof ct_state_str, "ct_state[%d]", CS_INVALID_BIT);
  76     expr_symtab_add_subfield(&symtab, "ct.inv", "ct.trk", ct_state_str);
  77
  78     /* Data fields. */
  79     expr_symtab_add_field(&symtab, "eth.src", MFF_ETH_SRC, NULL, false);
  80     expr_symtab_add_field(&symtab, "eth.dst", MFF_ETH_DST, NULL, false);
  81     expr_symtab_add_field(&symtab, "eth.type", MFF_ETH_TYPE, NULL, true);
  82     expr_symtab_add_predicate(&symtab, "eth.bcast",
  83                               "eth.dst == ff:ff:ff:ff:ff:ff");
  84     expr_symtab_add_subfield(&symtab, "eth.mcast", NULL, "eth.dst[40]");
  85
  86     expr_symtab_add_field(&symtab, "vlan.tci", MFF_VLAN_TCI, NULL, false);
  87     expr_symtab_add_predicate(&symtab, "vlan.present", "vlan.tci[12]");
  88     expr_symtab_add_subfield(&symtab, "vlan.pcp", "vlan.present",
  89                              "vlan.tci[13..15]");
  90     expr_symtab_add_subfield(&symtab, "vlan.vid", "vlan.present",
  91                              "vlan.tci[0..11]");
  92
  93     expr_symtab_add_predicate(&symtab, "ip4", "eth.type == 0x800");
  94     expr_symtab_add_predicate(&symtab, "ip6", "eth.type == 0x86dd");
  95     expr_symtab_add_predicate(&symtab, "ip", "ip4 || ip6");
  96     expr_symtab_add_field(&symtab, "ip.proto", MFF_IP_PROTO, "ip", true);
  97     expr_symtab_add_field(&symtab, "ip.dscp", MFF_IP_DSCP, "ip", false);
  98     expr_symtab_add_field(&symtab, "ip.ecn", MFF_IP_ECN, "ip", false);
  99     expr_symtab_add_field(&symtab, "ip.ttl", MFF_IP_TTL, "ip", false);
 100
 101     expr_symtab_add_field(&symtab, "ip4.src", MFF_IPV4_SRC, "ip4", false);
 102     expr_symtab_add_field(&symtab, "ip4.dst", MFF_IPV4_DST, "ip4", false);
 103     expr_symtab_add_predicate(&symtab, "ip4.mcast", "ip4.dst[28..31] == 0xe");
 104
 105     expr_symtab_add_predicate(&symtab, "icmp4", "ip4 && ip.proto == 1");
 106     expr_symtab_add_field(&symtab, "icmp4.type", MFF_ICMPV4_TYPE, "icmp4",
 107               false);
 108     expr_symtab_add_field(&symtab, "icmp4.code", MFF_ICMPV4_CODE, "icmp4",
 109               false);
 110
 111     expr_symtab_add_field(&symtab, "ip6.src", MFF_IPV6_SRC, "ip6", false);
 112     expr_symtab_add_field(&symtab, "ip6.dst", MFF_IPV6_DST, "ip6", false);
 113     expr_symtab_add_field(&symtab, "ip6.label", MFF_IPV6_LABEL, "ip6", false);
 114
 115     expr_symtab_add_predicate(&symtab, "icmp6", "ip6 && ip.proto == 58");
 116     expr_symtab_add_field(&symtab, "icmp6.type", MFF_ICMPV6_TYPE, "icmp6",
 117                           true);
 118     expr_symtab_add_field(&symtab, "icmp6.code", MFF_ICMPV6_CODE, "icmp6",
 119                           true);
 120
 121     expr_symtab_add_predicate(&symtab, "icmp", "icmp4 || icmp6");
 122
 123     expr_symtab_add_field(&symtab, "ip.frag", MFF_IP_FRAG, "ip", false);
 124     expr_symtab_add_predicate(&symtab, "ip.is_frag", "ip.frag[0]");
 125     expr_symtab_add_predicate(&symtab, "ip.later_frag", "ip.frag[1]");
 126     expr_symtab_add_predicate(&symtab, "ip.first_frag",
 127                               "ip.is_frag && !ip.later_frag");
 128
 129     expr_symtab_add_predicate(&symtab, "arp", "eth.type == 0x806");
 130     expr_symtab_add_field(&symtab, "arp.op", MFF_ARP_OP, "arp", false);
 131     expr_symtab_add_field(&symtab, "arp.spa", MFF_ARP_SPA, "arp", false);
 132     expr_symtab_add_field(&symtab, "arp.sha", MFF_ARP_SHA, "arp", false);
 133     expr_symtab_add_field(&symtab, "arp.tpa", MFF_ARP_TPA, "arp", false);
 134     expr_symtab_add_field(&symtab, "arp.tha", MFF_ARP_THA, "arp", false);
 135
 136     expr_symtab_add_predicate(&symtab, "nd",
 137                               "icmp6.type == {135, 136} && icmp6.code == 0");
 138     expr_symtab_add_field(&symtab, "nd.target", MFF_ND_TARGET, "nd", false);
 139     expr_symtab_add_field(&symtab, "nd.sll", MFF_ND_SLL,
 140               "nd && icmp6.type == 135", false);
 141     expr_symtab_add_field(&symtab, "nd.tll", MFF_ND_TLL,
 142               "nd && icmp6.type == 136", false);
 143
 144     expr_symtab_add_predicate(&symtab, "tcp", "ip.proto == 6");
 145     expr_symtab_add_field(&symtab, "tcp.src", MFF_TCP_SRC, "tcp", false);
 146     expr_symtab_add_field(&symtab, "tcp.dst", MFF_TCP_DST, "tcp", false);
 147     expr_symtab_add_field(&symtab, "tcp.flags", MFF_TCP_FLAGS, "tcp", false);
 148
 149     expr_symtab_add_predicate(&symtab, "udp", "ip.proto == 17");
 150     expr_symtab_add_field(&symtab, "udp.src", MFF_UDP_SRC, "udp", false);
 151     expr_symtab_add_field(&symtab, "udp.dst", MFF_UDP_DST, "udp", false);
 152
 153     expr_symtab_add_predicate(&symtab, "sctp", "ip.proto == 132");
 154     expr_symtab_add_field(&symtab, "sctp.src", MFF_SCTP_SRC, "sctp", false);
 155     expr_symtab_add_field(&symtab, "sctp.dst", MFF_SCTP_DST, "sctp", false);
 156 }
 157 \f
 158 /* Logical datapaths and logical port numbers. */
 159
 160 /* A logical datapath.
 161  *
 162  * 'ports' maps 'logical_port' names to 'tunnel_key' values in the OVN_SB
 163  * Port_Binding table within the logical datapath. */
 164 struct logical_datapath {
 165     struct hmap_node hmap_node; /* Indexed on 'uuid'. */
 166     struct uuid uuid;           /* UUID from Datapath_Binding row. */
 167     uint32_t tunnel_key;        /* 'tunnel_key' from Datapath_Binding row. */
 168     struct simap ports;         /* Logical port name to port number. */
 169 };
 170
 171 /* Contains "struct logical_datapath"s. */
 172 static struct hmap logical_datapaths = HMAP_INITIALIZER(&logical_datapaths);
 173
 174 /* Finds and returns the logical_datapath for 'binding', or NULL if no such
 175  * logical_datapath exists. */
 176 static struct logical_datapath *
 177 ldp_lookup(const struct sbrec_datapath_binding *binding)
 178 {
 179     struct logical_datapath *ldp;
 180     HMAP_FOR_EACH_IN_BUCKET (ldp, hmap_node, uuid_hash(&binding->header_.uuid),
 181                              &logical_datapaths) {
 182         if (uuid_equals(&ldp->uuid, &binding->header_.uuid)) {
 183             return ldp;
 184         }
 185     }
 186     return NULL;
 187 }
 188
 189 /* Creates a new logical_datapath for the given 'binding'. */
 190 static struct logical_datapath *
 191 ldp_create(const struct sbrec_datapath_binding *binding)
 192 {
 193     struct logical_datapath *ldp;
 194
 195     ldp = xmalloc(sizeof *ldp);
 196     hmap_insert(&logical_datapaths, &ldp->hmap_node,
 197                 uuid_hash(&binding->header_.uuid));
 198     ldp->uuid = binding->header_.uuid;
 199     ldp->tunnel_key = binding->tunnel_key;
 200     simap_init(&ldp->ports);
 201     return ldp;
 202 }
 203
 204 static struct logical_datapath *
 205 ldp_lookup_or_create(const struct sbrec_datapath_binding *binding)
 206 {
 207     struct logical_datapath *ldp = ldp_lookup(binding);
 208     return ldp ? ldp : ldp_create(binding);
 209 }
 210
 211 static void
 212 ldp_free(struct logical_datapath *ldp)
 213 {
 214     simap_destroy(&ldp->ports);
 215     hmap_remove(&logical_datapaths, &ldp->hmap_node);
 216     free(ldp);
 217 }
 218
 219 /* Iterates through all of the records in the Port_Binding table, updating the
 220  * table of logical_datapaths to match the values found in active
 221  * Port_Bindings. */
 222 static void
 223 ldp_run(struct controller_ctx *ctx)
 224 {
 225     struct logical_datapath *ldp;
 226     HMAP_FOR_EACH (ldp, hmap_node, &logical_datapaths) {
 227         simap_clear(&ldp->ports);
 228     }
 229
 230     const struct sbrec_port_binding *binding;
 231     SBREC_PORT_BINDING_FOR_EACH (binding, ctx->ovnsb_idl) {
 232         struct logical_datapath *ldp = ldp_lookup_or_create(binding->datapath);
 233
 234         simap_put(&ldp->ports, binding->logical_port, binding->tunnel_key);
 235     }
 236
 237     const struct sbrec_multicast_group *mc;
 238     SBREC_MULTICAST_GROUP_FOR_EACH (mc, ctx->ovnsb_idl) {
 239         struct logical_datapath *ldp = ldp_lookup_or_create(mc->datapath);
 240         simap_put(&ldp->ports, mc->name, mc->tunnel_key);
 241     }
 242
 243     struct logical_datapath *next_ldp;
 244     HMAP_FOR_EACH_SAFE (ldp, next_ldp, hmap_node, &logical_datapaths) {
 245         if (simap_is_empty(&ldp->ports)) {
 246             ldp_free(ldp);
 247         }
 248     }
 249 }
 250
 251 static void
 252 ldp_destroy(void)
 253 {
 254     struct logical_datapath *ldp, *next_ldp;
 255     HMAP_FOR_EACH_SAFE (ldp, next_ldp, hmap_node, &logical_datapaths) {
 256         ldp_free(ldp);
 257     }
 258 }
 259 \f
 260 void
 261 lflow_init(void)
 262 {
 263     symtab_init();
 264 }
 265
 266 /* Translates logical flows in the Logical_Flow table in the OVN_SB database
 267  * into OpenFlow flows.  See ovn-architecture(7) for more information. */
 268 void
 269 lflow_run(struct controller_ctx *ctx, struct hmap *flow_table,
 270           const struct simap *ct_zones)
 271 {
 272     struct hmap flows = HMAP_INITIALIZER(&flows);
 273     uint32_t conj_id_ofs = 1;
 274
 275     ldp_run(ctx);
 276
 277     const struct sbrec_logical_flow *lflow;
 278     SBREC_LOGICAL_FLOW_FOR_EACH (lflow, ctx->ovnsb_idl) {
 279         /* Find the "struct logical_datapath" asssociated with this
 280          * Logical_Flow row.  If there's no such struct, that must be because
 281          * no logical ports are bound to that logical datapath, so there's no
 282          * point in maintaining any flows for it anyway, so skip it. */
 283         const struct logical_datapath *ldp;
 284         ldp = ldp_lookup(lflow->logical_datapath);
 285         if (!ldp) {
 286             continue;
 287         }
 288
 289         /* Determine translation of logical table IDs to physical table IDs. */
 290         bool ingress = !strcmp(lflow->pipeline, "ingress");
 291         uint8_t first_ptable = (ingress
 292                                 ? OFTABLE_LOG_INGRESS_PIPELINE
 293                                 : OFTABLE_LOG_EGRESS_PIPELINE);
 294         uint8_t ptable = first_ptable + lflow->table_id;
 295         uint8_t output_ptable = (ingress
 296                                  ? OFTABLE_REMOTE_OUTPUT
 297                                  : OFTABLE_LOG_TO_PHY);
 298
 299         /* Translate OVN actions into OpenFlow actions.
 300          *
 301          * XXX Deny changes to 'outport' in egress pipeline. */
 302         uint64_t ofpacts_stub[64 / 8];
 303         struct ofpbuf ofpacts;
 304         struct expr *prereqs;
 305         char *error;
 306
 307         ofpbuf_use_stub(&ofpacts, ofpacts_stub, sizeof ofpacts_stub);
 308         struct action_params ap = {
 309             .symtab = &symtab,
 310             .ports = &ldp->ports,
 311             .ct_zones = ct_zones,
 312
 313             .n_tables = LOG_PIPELINE_LEN,
 314             .first_ptable = first_ptable,
 315             .cur_ltable = lflow->table_id,
 316             .output_ptable = output_ptable,
 317         };
 318         error = actions_parse_string(lflow->actions, &ap, &ofpacts, &prereqs);
 319         if (error) {
 320             static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1);
 321             VLOG_WARN_RL(&rl, "error parsing actions \"%s\": %s",
 322                          lflow->actions, error);
 323             free(error);
 324             continue;
 325         }
 326
 327         /* Translate OVN match into table of OpenFlow matches. */
 328         struct hmap matches;
 329         struct expr *expr;
 330
 331         expr = expr_parse_string(lflow->match, &symtab, &error);
 332         if (!error) {
 333             if (prereqs) {
 334                 expr = expr_combine(EXPR_T_AND, expr, prereqs);
 335                 prereqs = NULL;
 336             }
 337             expr = expr_annotate(expr, &symtab, &error);
 338         }
 339         if (error) {
 340             static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1);
 341             VLOG_WARN_RL(&rl, "error parsing match \"%s\": %s",
 342                          lflow->match, error);
 343             expr_destroy(prereqs);
 344             ofpbuf_uninit(&ofpacts);
 345             free(error);
 346             continue;
 347         }
 348
 349         expr = expr_simplify(expr);
 350         expr = expr_normalize(expr);
 351         uint32_t n_conjs = expr_to_matches(expr, &ldp->ports, &matches);
 352         expr_destroy(expr);
 353
 354         /* Prepare the OpenFlow matches for adding to the flow table. */
 355         struct expr_match *m;
 356         HMAP_FOR_EACH (m, hmap_node, &matches) {
 357             match_set_metadata(&m->match, htonll(ldp->tunnel_key));
 358             if (m->match.wc.masks.conj_id) {
 359                 m->match.flow.conj_id += conj_id_ofs;
 360             }
 361             if (!m->n) {
 362                 ofctrl_add_flow(flow_table, ptable, lflow->priority,
 363                                 &m->match, &ofpacts);
 364             } else {
 365                 uint64_t conj_stubs[64 / 8];
 366                 struct ofpbuf conj;
 367
 368                 ofpbuf_use_stub(&conj, conj_stubs, sizeof conj_stubs);
 369                 for (int i = 0; i < m->n; i++) {
 370                     const struct cls_conjunction *src = &m->conjunctions[i];
 371                     struct ofpact_conjunction *dst;
 372
 373                     dst = ofpact_put_CONJUNCTION(&conj);
 374                     dst->id = src->id + conj_id_ofs;
 375                     dst->clause = src->clause;
 376                     dst->n_clauses = src->n_clauses;
 377                 }
 378                 ofctrl_add_flow(flow_table, ptable, lflow->priority,
 379                                 &m->match, &conj);
 380                 ofpbuf_uninit(&conj);
 381             }
 382         }
 383
 384         /* Clean up. */
 385         expr_matches_destroy(&matches);
 386         ofpbuf_uninit(&ofpacts);
 387         conj_id_ofs += n_conjs;
 388     }
 389 }
 390
 391 void
 392 lflow_destroy(void)
 393 {
 394     expr_symtab_destroy(&symtab);
 395     ldp_destroy();
 396 }