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 "ofpbuf.h"
  25 #include "ovs-thread.h"
  26 #include "odp-util.h"
  27 #include "tnl-arp-cache.h"
  28 #include "tnl-ports.h"
  29 #include "ovs-thread.h"
  30 #include "unixctl.h"
  31 #include "util.h"
  32
  33 static struct ovs_mutex mutex = OVS_MUTEX_INITIALIZER;
  34 static struct classifier cls;   /* Tunnel ports. */
  35
  36 struct tnl_port_in {
  37     struct cls_rule cr;
  38     odp_port_t portno;
  39     struct ovs_refcount ref_cnt;
  40     char dev_name[IFNAMSIZ];
  41 };
  42
  43 static struct tnl_port_in *
  44 tnl_port_cast(const struct cls_rule *cr)
  45 {
  46     BUILD_ASSERT_DECL(offsetof(struct tnl_port_in, cr) == 0);
  47
  48     return CONTAINER_OF(cr, struct tnl_port_in, cr);
  49 }
  50
  51 static void
  52 tnl_port_free(struct tnl_port_in *p)
  53 {
  54     cls_rule_destroy(&p->cr);
  55     free(p);
  56 }
  57
  58 static void
  59 tnl_port_init_flow(struct flow *flow, ovs_be32 ip_dst, ovs_be16 udp_port)
  60 {
  61     memset(flow, 0, sizeof *flow);
  62     flow->dl_type = htons(ETH_TYPE_IP);
  63     if (udp_port) {
  64         flow->nw_proto = IPPROTO_UDP;
  65     } else {
  66         flow->nw_proto = IPPROTO_GRE;
  67     }
  68     flow->tp_dst = udp_port;
  69     /* When matching on incoming flow from remove tnl end point,
  70      * our dst ip address is source ip for them. */
  71     flow->nw_src = ip_dst;
  72 }
  73
  74 void
  75 tnl_port_map_insert(odp_port_t port, ovs_be32 ip_dst, ovs_be16 udp_port,
  76                     const char dev_name[])
  77 {
  78     const struct cls_rule *cr;
  79     struct tnl_port_in *p;
  80     struct match match;
  81
  82     memset(&match, 0, sizeof match);
  83     tnl_port_init_flow(&match.flow, ip_dst, udp_port);
  84
  85     ovs_mutex_lock(&mutex);
  86     do {
  87         cr = classifier_lookup(&cls, &match.flow, NULL);
  88         p = tnl_port_cast(cr);
  89         /* Try again if the rule was released before we get the reference. */
  90     } while (p && !ovs_refcount_try_ref_rcu(&p->ref_cnt));
  91
  92     if (!p) {
  93         p = xzalloc(sizeof *p);
  94         p->portno = port;
  95
  96         match.wc.masks.dl_type = OVS_BE16_MAX;
  97         match.wc.masks.nw_proto = 0xff;
  98         match.wc.masks.nw_frag = 0xff;      /* XXX: No fragments support. */
  99         match.wc.masks.tp_dst = OVS_BE16_MAX;
 100         match.wc.masks.nw_src = OVS_BE32_MAX;
 101
 102         cls_rule_init(&p->cr, &match, 0);   /* Priority == 0. */
 103         ovs_refcount_init(&p->ref_cnt);
 104         strncpy(p->dev_name, dev_name, IFNAMSIZ);
 105
 106         classifier_insert(&cls, &p->cr, NULL, 0);
 107     }
 108     ovs_mutex_unlock(&mutex);
 109 }
 110
 111 static void
 112 tnl_port_unref(const struct cls_rule *cr)
 113 {
 114     struct tnl_port_in *p = tnl_port_cast(cr);
 115
 116     if (cr && ovs_refcount_unref_relaxed(&p->ref_cnt) == 1) {
 117         ovs_mutex_lock(&mutex);
 118         if (classifier_remove(&cls, cr)) {
 119             ovsrcu_postpone(tnl_port_free, p);
 120         }
 121         ovs_mutex_unlock(&mutex);
 122     }
 123 }
 124
 125 void
 126 tnl_port_map_delete(ovs_be32 ip_dst, ovs_be16 udp_port)
 127 {
 128     const struct cls_rule *cr;
 129     struct flow flow;
 130
 131     tnl_port_init_flow(&flow, ip_dst, udp_port);
 132
 133     cr = classifier_lookup(&cls, &flow, NULL);
 134     tnl_port_unref(cr);
 135 }
 136
 137 /* 'flow' is non-const to allow for temporary modifications during the lookup.
 138  * Any changes are restored before returning. */
 139 odp_port_t
 140 tnl_port_map_lookup(struct flow *flow, struct flow_wildcards *wc)
 141 {
 142     const struct cls_rule *cr = classifier_lookup(&cls, flow, wc);
 143
 144     return (cr) ? tnl_port_cast(cr)->portno : ODPP_NONE;
 145 }
 146
 147 static void
 148 tnl_port_show(struct unixctl_conn *conn, int argc OVS_UNUSED,
 149               const char *argv[] OVS_UNUSED, void *aux OVS_UNUSED)
 150 {
 151     struct ds ds = DS_EMPTY_INITIALIZER;
 152     const struct tnl_port_in *p;
 153
 154     ds_put_format(&ds, "Listening ports:\n");
 155     CLS_FOR_EACH(p, cr, &cls) {
 156         struct odputil_keybuf keybuf;
 157         struct odputil_keybuf maskbuf;
 158         struct flow flow;
 159         const struct nlattr *key, *mask;
 160         size_t key_len, mask_len;
 161         struct flow_wildcards wc;
 162         struct ofpbuf buf;
 163
 164         ds_put_format(&ds, "%s (%"PRIu32") : ", p->dev_name, p->portno);
 165         minimask_expand(&p->cr.match.mask, &wc);
 166         miniflow_expand(&p->cr.match.flow, &flow);
 167
 168         /* Key. */
 169         ofpbuf_use_stack(&buf, &keybuf, sizeof keybuf);
 170         odp_flow_key_from_flow(&buf, &flow, &wc.masks,
 171                                flow.in_port.odp_port, true);
 172         key = ofpbuf_data(&buf);
 173         key_len = ofpbuf_size(&buf);
 174         /* mask*/
 175         ofpbuf_use_stack(&buf, &maskbuf, sizeof maskbuf);
 176         odp_flow_key_from_mask(&buf, &wc.masks, &flow,
 177                                odp_to_u32(wc.masks.in_port.odp_port),
 178                                SIZE_MAX, false);
 179         mask = ofpbuf_data(&buf);
 180         mask_len = ofpbuf_size(&buf);
 181
 182         /* build string. */
 183         odp_flow_format(key, key_len, mask, mask_len, NULL, &ds, false);
 184         ds_put_format(&ds, "\n");
 185     }
 186     unixctl_command_reply(conn, ds_cstr(&ds));
 187     ds_destroy(&ds);
 188 }
 189
 190 void
 191 tnl_port_map_init(void)
 192 {
 193     classifier_init(&cls, flow_segment_u64s);
 194     unixctl_command_register("tnl/ports/show", "", 0, 0, tnl_port_show, NULL);
 195 }