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/*
* Copyright (c) 2014 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include <stddef.h>
#include <stdint.h>
#include "classifier.h"
#include "dynamic-string.h"
#include "hash.h"
#include "ofpbuf.h"
#include "ovs-thread.h"
#include "odp-util.h"
#include "tnl-arp-cache.h"
#include "tnl-ports.h"
#include "unixctl.h"
#include "util.h"
static struct classifier cls; /* Tunnel ports. */
struct tnl_port_in {
struct cls_rule cr;
odp_port_t portno;
struct ovs_refcount ref_cnt;
char dev_name[IFNAMSIZ];
};
static struct tnl_port_in *
tnl_port_cast(const struct cls_rule *cr)
{
BUILD_ASSERT_DECL(offsetof(struct tnl_port_in, cr) == 0);
return CONTAINER_OF(cr, struct tnl_port_in, cr);
}
static void
tnl_port_free(struct tnl_port_in *p)
{
cls_rule_destroy(&p->cr);
free(p);
}
static void
tnl_port_init_flow(struct flow *flow, ovs_be32 ip_dst, ovs_be16 udp_port)
{
memset(flow, 0, sizeof *flow);
flow->dl_type = htons(ETH_TYPE_IP);
if (udp_port) {
flow->nw_proto = IPPROTO_UDP;
} else {
flow->nw_proto = IPPROTO_GRE;
}
flow->tp_dst = udp_port;
/* When matching on incoming flow from remove tnl end point,
* our dst ip address is source ip for them. */
flow->nw_src = ip_dst;
}
void
tnl_port_map_insert(odp_port_t port, ovs_be32 ip_dst, ovs_be16 udp_port,
const char dev_name[])
{
const struct cls_rule *cr;
struct tnl_port_in *p;
struct match match;
memset(&match, 0, sizeof match);
tnl_port_init_flow(&match.flow, ip_dst, udp_port);
do {
cr = classifier_lookup(&cls, &match.flow, NULL);
p = tnl_port_cast(cr);
/* Try again if the rule was released before we get the reference. */
} while (p && !ovs_refcount_try_ref_rcu(&p->ref_cnt));
if (p) {
return; /* Added refcount of an existing port. */
}
p = xzalloc(sizeof *p);
p->portno = port;
match.wc.masks.dl_type = OVS_BE16_MAX;
match.wc.masks.nw_proto = 0xff;
match.wc.masks.nw_frag = 0xff; /* XXX: No fragments support. */
match.wc.masks.tp_dst = OVS_BE16_MAX;
match.wc.masks.nw_src = OVS_BE32_MAX;
cls_rule_init(&p->cr, &match, 0); /* Priority == 0. */
ovs_refcount_init(&p->ref_cnt);
strncpy(p->dev_name, dev_name, IFNAMSIZ);
classifier_insert(&cls, &p->cr);
}
static void
tnl_port_unref(const struct cls_rule *cr)
{
struct tnl_port_in *p = tnl_port_cast(cr);
if (cr && ovs_refcount_unref_relaxed(&p->ref_cnt) == 1) {
if (classifier_remove(&cls, cr)) {
ovsrcu_postpone(tnl_port_free, p);
}
}
}
void
tnl_port_map_delete(ovs_be32 ip_dst, ovs_be16 udp_port)
{
const struct cls_rule *cr;
struct flow flow;
tnl_port_init_flow(&flow, ip_dst, udp_port);
cr = classifier_lookup(&cls, &flow, NULL);
tnl_port_unref(cr);
}
odp_port_t
tnl_port_map_lookup(const struct flow *flow, struct flow_wildcards *wc)
{
const struct cls_rule *cr = classifier_lookup(&cls, flow, wc);
return (cr) ? tnl_port_cast(cr)->portno : ODPP_NONE;
}
static void
tnl_port_show(struct unixctl_conn *conn, int argc OVS_UNUSED,
const char *argv[] OVS_UNUSED, void *aux OVS_UNUSED)
{
struct ds ds = DS_EMPTY_INITIALIZER;
const struct tnl_port_in *p;
ds_put_format(&ds, "Listening ports:\n");
CLS_FOR_EACH(p, cr, &cls) {
struct odputil_keybuf keybuf;
struct odputil_keybuf maskbuf;
struct flow flow;
const struct nlattr *key, *mask;
size_t key_len, mask_len;
struct flow_wildcards wc;
struct ofpbuf buf;
ds_put_format(&ds, "%s (%"PRIu32") : ", p->dev_name, p->portno);
minimask_expand(&p->cr.match.mask, &wc);
miniflow_expand(&p->cr.match.flow, &flow);
/* Key. */
ofpbuf_use_stack(&buf, &keybuf, sizeof keybuf);
odp_flow_key_from_flow(&buf, &flow, &wc.masks,
flow.in_port.odp_port, true);
key = ofpbuf_data(&buf);
key_len = ofpbuf_size(&buf);
/* mask*/
ofpbuf_use_stack(&buf, &maskbuf, sizeof maskbuf);
odp_flow_key_from_mask(&buf, &wc.masks, &flow,
odp_to_u32(wc.masks.in_port.odp_port),
SIZE_MAX, false);
mask = ofpbuf_data(&buf);
mask_len = ofpbuf_size(&buf);
/* build string. */
odp_flow_format(key, key_len, mask, mask_len, NULL, &ds, false);
ds_put_format(&ds, "\n");
}
unixctl_command_reply(conn, ds_cstr(&ds));
ds_destroy(&ds);
}
void
tnl_port_map_init(void)
{
classifier_init(&cls, flow_segment_u32s);
unixctl_command_register("tnl/ports/show", "", 0, 0, tnl_port_show, NULL);
}
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