lib/tnl-ports.c

   1 /*
   2  * Copyright (c) 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 #include <config.h>
  18 #include <stddef.h>
  19 #include <stdint.h>
  20
  21 #include "classifier.h"
  22 #include "dynamic-string.h"
  23 #include "hash.h"
  24 #include "list.h"
  25 #include "ofpbuf.h"
  26 #include "ovs-thread.h"
  27 #include "odp-util.h"
  28 #include "tnl-arp-cache.h"
  29 #include "tnl-ports.h"
  30 #include "ovs-thread.h"
  31 #include "unixctl.h"
  32 #include "util.h"
  33
  34 static struct ovs_mutex mutex = OVS_MUTEX_INITIALIZER;
  35 static struct classifier cls;   /* Tunnel ports. */
  36
  37 struct ip_device {
  38     struct netdev *dev;
  39     struct eth_addr mac;
  40     ovs_be32 addr;
  41     uint64_t change_seq;
  42     struct ovs_list node;
  43     char dev_name[IFNAMSIZ];
  44 };
  45
  46 static struct ovs_list addr_list;
  47
  48 struct tnl_port {
  49     odp_port_t port;
  50     ovs_be16 udp_port;
  51     char dev_name[IFNAMSIZ];
  52     struct ovs_list node;
  53 };
  54
  55 static struct ovs_list port_list;
  56
  57 struct tnl_port_in {
  58     struct cls_rule cr;
  59     odp_port_t portno;
  60     struct ovs_refcount ref_cnt;
  61     char dev_name[IFNAMSIZ];
  62 };
  63
  64 static struct tnl_port_in *
  65 tnl_port_cast(const struct cls_rule *cr)
  66 {
  67     BUILD_ASSERT_DECL(offsetof(struct tnl_port_in, cr) == 0);
  68
  69     return CONTAINER_OF(cr, struct tnl_port_in, cr);
  70 }
  71
  72 static void
  73 tnl_port_free(struct tnl_port_in *p)
  74 {
  75     cls_rule_destroy(&p->cr);
  76     free(p);
  77 }
  78
  79 static void
  80 tnl_port_init_flow(struct flow *flow, struct eth_addr mac,
  81                    ovs_be32 addr, ovs_be16 udp_port)
  82 {
  83     memset(flow, 0, sizeof *flow);
  84
  85     flow->dl_type = htons(ETH_TYPE_IP);
  86     flow->dl_dst = mac;
  87     flow->nw_dst = addr;
  88
  89     if (udp_port) {
  90         flow->nw_proto = IPPROTO_UDP;
  91     } else {
  92         flow->nw_proto = IPPROTO_GRE;
  93     }
  94     flow->tp_dst = udp_port;
  95 }
  96
  97 static void
  98 map_insert(odp_port_t port, struct eth_addr mac, ovs_be32 addr,
  99            ovs_be16 udp_port, const char dev_name[])
 100 {
 101     const struct cls_rule *cr;
 102     struct tnl_port_in *p;
 103     struct match match;
 104
 105     memset(&match, 0, sizeof match);
 106     tnl_port_init_flow(&match.flow, mac, addr, udp_port);
 107
 108     do {
 109         cr = classifier_lookup(&cls, CLS_MAX_VERSION, &match.flow, NULL);
 110         p = tnl_port_cast(cr);
 111         /* Try again if the rule was released before we get the reference. */
 112     } while (p && !ovs_refcount_try_ref_rcu(&p->ref_cnt));
 113
 114     if (!p) {
 115         p = xzalloc(sizeof *p);
 116         p->portno = port;
 117
 118         match.wc.masks.dl_type = OVS_BE16_MAX;
 119         match.wc.masks.nw_proto = 0xff;
 120         match.wc.masks.nw_frag = 0xff;      /* XXX: No fragments support. */
 121         match.wc.masks.tp_dst = OVS_BE16_MAX;
 122         match.wc.masks.nw_dst = OVS_BE32_MAX;
 123         match.wc.masks.vlan_tci = OVS_BE16_MAX;
 124         memset(&match.wc.masks.dl_dst, 0xff, sizeof (struct eth_addr));
 125
 126         cls_rule_init(&p->cr, &match, 0); /* Priority == 0. */
 127         ovs_refcount_init(&p->ref_cnt);
 128         ovs_strlcpy(p->dev_name, dev_name, sizeof p->dev_name);
 129
 130         classifier_insert(&cls, &p->cr, CLS_MIN_VERSION, NULL, 0);
 131     }
 132 }
 133
 134 void
 135 tnl_port_map_insert(odp_port_t port,
 136                     ovs_be16 udp_port, const char dev_name[])
 137 {
 138     struct tnl_port *p;
 139     struct ip_device *ip_dev;
 140
 141     ovs_mutex_lock(&mutex);
 142     LIST_FOR_EACH(p, node, &port_list) {
 143         if (udp_port == p->udp_port) {
 144              goto out;
 145         }
 146     }
 147
 148     p = xzalloc(sizeof *p);
 149     p->port = port;
 150     p->udp_port = udp_port;
 151     ovs_strlcpy(p->dev_name, dev_name, sizeof p->dev_name);
 152     list_insert(&port_list, &p->node);
 153
 154     LIST_FOR_EACH(ip_dev, node, &addr_list) {
 155         map_insert(p->port, ip_dev->mac, ip_dev->addr,
 156                    p->udp_port, p->dev_name);
 157     }
 158
 159 out:
 160     ovs_mutex_unlock(&mutex);
 161 }
 162
 163 static void
 164 tnl_port_unref(const struct cls_rule *cr)
 165 {
 166     struct tnl_port_in *p = tnl_port_cast(cr);
 167
 168     if (cr && ovs_refcount_unref_relaxed(&p->ref_cnt) == 1) {
 169         if (classifier_remove(&cls, cr)) {
 170             ovsrcu_postpone(tnl_port_free, p);
 171         }
 172     }
 173 }
 174
 175 static void
 176 map_delete(struct eth_addr mac, ovs_be32 addr, ovs_be16 udp_port)
 177 {
 178     const struct cls_rule *cr;
 179     struct flow flow;
 180
 181     tnl_port_init_flow(&flow, mac, addr, udp_port);
 182
 183     cr = classifier_lookup(&cls, CLS_MAX_VERSION, &flow, NULL);
 184     tnl_port_unref(cr);
 185 }
 186
 187 void
 188 tnl_port_map_delete(ovs_be16 udp_port)
 189 {
 190     struct tnl_port *p, *next;
 191     struct ip_device *ip_dev;
 192     bool found = false;
 193
 194     ovs_mutex_lock(&mutex);
 195     LIST_FOR_EACH_SAFE(p, next, node, &port_list) {
 196         if (p->udp_port == udp_port) {
 197             list_remove(&p->node);
 198             found = true;
 199             break;
 200         }
 201     }
 202
 203     if (!found) {
 204         goto out;
 205     }
 206     LIST_FOR_EACH(ip_dev, node, &addr_list) {
 207         map_delete(ip_dev->mac, ip_dev->addr, udp_port);
 208     }
 209
 210     free(p);
 211 out:
 212     ovs_mutex_unlock(&mutex);
 213 }
 214
 215 /* 'flow' is non-const to allow for temporary modifications during the lookup.
 216  * Any changes are restored before returning. */
 217 odp_port_t
 218 tnl_port_map_lookup(struct flow *flow, struct flow_wildcards *wc)
 219 {
 220     const struct cls_rule *cr = classifier_lookup(&cls, CLS_MAX_VERSION, flow,
 221                                                   wc);
 222
 223     return (cr) ? tnl_port_cast(cr)->portno : ODPP_NONE;
 224 }
 225
 226 static void
 227 tnl_port_show_v(struct ds *ds)
 228 {
 229     const struct tnl_port_in *p;
 230
 231     CLS_FOR_EACH(p, cr, &cls) {
 232         struct odputil_keybuf keybuf;
 233         struct odputil_keybuf maskbuf;
 234         struct flow flow;
 235         const struct nlattr *key, *mask;
 236         size_t key_len, mask_len;
 237         struct flow_wildcards wc;
 238         struct ofpbuf buf;
 239         struct odp_flow_key_parms odp_parms = {
 240             .flow = &flow,
 241             .mask = &wc.masks,
 242         };
 243
 244         ds_put_format(ds, "%s (%"PRIu32") : ", p->dev_name, p->portno);
 245         minimask_expand(p->cr.match.mask, &wc);
 246         miniflow_expand(p->cr.match.flow, &flow);
 247
 248         /* Key. */
 249         odp_parms.odp_in_port = flow.in_port.odp_port;
 250         odp_parms.support.recirc = true;
 251         ofpbuf_use_stack(&buf, &keybuf, sizeof keybuf);
 252         odp_flow_key_from_flow(&odp_parms, &buf);
 253         key = buf.data;
 254         key_len = buf.size;
 255
 256         /* mask*/
 257         odp_parms.odp_in_port = wc.masks.in_port.odp_port;
 258         odp_parms.support.recirc = false;
 259         ofpbuf_use_stack(&buf, &maskbuf, sizeof maskbuf);
 260         odp_flow_key_from_mask(&odp_parms, &buf);
 261         mask = buf.data;
 262         mask_len = buf.size;
 263
 264         /* build string. */
 265         odp_flow_format(key, key_len, mask, mask_len, NULL, ds, false);
 266         ds_put_format(ds, "\n");
 267     }
 268 }
 269
 270 static void
 271 tnl_port_show(struct unixctl_conn *conn, int argc OVS_UNUSED,
 272                const char *argv[] OVS_UNUSED, void *aux OVS_UNUSED)
 273 {
 274     struct ds ds = DS_EMPTY_INITIALIZER;
 275     struct tnl_port *p;
 276
 277     ds_put_format(&ds, "Listening ports:\n");
 278     ovs_mutex_lock(&mutex);
 279     if (argc > 1) {
 280         if (!strcasecmp(argv[1], "-v")) {
 281             tnl_port_show_v(&ds);
 282             goto out;
 283         }
 284     }
 285
 286     LIST_FOR_EACH(p, node, &port_list) {
 287         ds_put_format(&ds, "%s (%"PRIu32")\n", p->dev_name, p->port);
 288     }
 289
 290 out:
 291     ovs_mutex_unlock(&mutex);
 292     unixctl_command_reply(conn, ds_cstr(&ds));
 293     ds_destroy(&ds);
 294 }
 295
 296 static void
 297 map_insert_ipdev(struct ip_device *ip_dev)
 298 {
 299     struct tnl_port *p;
 300
 301     LIST_FOR_EACH(p, node, &port_list) {
 302         map_insert(p->port, ip_dev->mac, ip_dev->addr,
 303                    p->udp_port, p->dev_name);
 304     }
 305 }
 306
 307 static void
 308 insert_ipdev(const char dev_name[])
 309 {
 310     struct ip_device *ip_dev;
 311     enum netdev_flags flags;
 312     struct netdev *dev;
 313     int error;
 314
 315     error = netdev_open(dev_name, NULL, &dev);
 316     if (error) {
 317         return;
 318     }
 319
 320     error = netdev_get_flags(dev, &flags);
 321     if (error || (flags & NETDEV_LOOPBACK)) {
 322         netdev_close(dev);
 323         return;
 324     }
 325
 326     ip_dev = xzalloc(sizeof *ip_dev);
 327     ip_dev->dev = dev;
 328     ip_dev->change_seq = netdev_get_change_seq(dev);
 329     error = netdev_get_etheraddr(ip_dev->dev, &ip_dev->mac);
 330     if (error) {
 331         return;
 332     }
 333     error = netdev_get_in4(ip_dev->dev, (struct in_addr *)&ip_dev->addr, NULL);
 334     if (error) {
 335         return;
 336     }
 337     ovs_strlcpy(ip_dev->dev_name, netdev_get_name(dev), sizeof ip_dev->dev_name);
 338
 339     list_insert(&addr_list, &ip_dev->node);
 340     map_insert_ipdev(ip_dev);
 341 }
 342
 343 static void
 344 delete_ipdev(struct ip_device *ip_dev)
 345 {
 346     struct tnl_port *p;
 347
 348     LIST_FOR_EACH(p, node, &port_list) {
 349         map_delete(ip_dev->mac, ip_dev->addr, p->udp_port);
 350     }
 351
 352     list_remove(&ip_dev->node);
 353     netdev_close(ip_dev->dev);
 354     free(ip_dev);
 355 }
 356
 357 void
 358 tnl_port_map_insert_ipdev(const char dev_name[])
 359 {
 360     struct ip_device *ip_dev, *next;
 361
 362     ovs_mutex_lock(&mutex);
 363
 364     LIST_FOR_EACH_SAFE(ip_dev, next, node, &addr_list) {
 365         if (!strcmp(netdev_get_name(ip_dev->dev), dev_name)) {
 366             if (ip_dev->change_seq == netdev_get_change_seq(ip_dev->dev)) {
 367                 goto out;
 368             }
 369             /* Address changed. */
 370             delete_ipdev(ip_dev);
 371             break;
 372         }
 373     }
 374     insert_ipdev(dev_name);
 375
 376 out:
 377     ovs_mutex_unlock(&mutex);
 378 }
 379
 380 void
 381 tnl_port_map_delete_ipdev(const char dev_name[])
 382 {
 383     struct ip_device *ip_dev, *next;
 384
 385     ovs_mutex_lock(&mutex);
 386     LIST_FOR_EACH_SAFE(ip_dev, next, node, &addr_list) {
 387         if (!strcmp(netdev_get_name(ip_dev->dev), dev_name)) {
 388             delete_ipdev(ip_dev);
 389         }
 390     }
 391     ovs_mutex_unlock(&mutex);
 392 }
 393
 394 void
 395 tnl_port_map_run(void)
 396 {
 397     struct ip_device *ip_dev, *next;
 398
 399     ovs_mutex_lock(&mutex);
 400     LIST_FOR_EACH_SAFE(ip_dev, next, node, &addr_list) {
 401         char dev_name[IFNAMSIZ];
 402
 403         if (ip_dev->change_seq == netdev_get_change_seq(ip_dev->dev)) {
 404             continue;
 405         }
 406
 407         /* Address changed. */
 408         ovs_strlcpy(dev_name, ip_dev->dev_name, sizeof dev_name);
 409         delete_ipdev(ip_dev);
 410         insert_ipdev(dev_name);
 411     }
 412     ovs_mutex_unlock(&mutex);
 413 }
 414
 415 void
 416 tnl_port_map_init(void)
 417 {
 418     classifier_init(&cls, flow_segment_u64s);
 419     list_init(&addr_list);
 420     list_init(&port_list);
 421     unixctl_command_register("tnl/ports/show", "-v", 0, 1, tnl_port_show, NULL);
 422 }