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openvswitch/lib/route-table.c
Pravin B Shelar 6fd6ed71cb ofpbuf: Simplify ofpbuf API.
ofpbuf was complicated due to its wide usage across all
layers of OVS, Now we have introduced independent dp_packet
which can be used for datapath packet, we can simplify ofpbuf.
Following patch removes DPDK mbuf and access API of ofpbuf
members.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Jarno Rajahalme <jrajahalme@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
2015-03-03 13:37:39 -08:00

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/*
* Copyright (c) 2011, 2012, 2013, 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 "route-table.h"
#include <errno.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <linux/rtnetlink.h>
#include <net/if.h>
#include "hash.h"
#include "netlink.h"
#include "netlink-notifier.h"
#include "netlink-socket.h"
#include "ofpbuf.h"
#include "ovs-router.h"
#include "rtnetlink-link.h"
#include "openvswitch/vlog.h"
VLOG_DEFINE_THIS_MODULE(route_table);
struct route_data {
/* Copied from struct rtmsg. */
unsigned char rtm_dst_len;
/* Extracted from Netlink attributes. */
ovs_be32 rta_dst; /* 0 if missing. */
ovs_be32 rta_gw;
char ifname[IFNAMSIZ]; /* Interface name. */
};
/* A digested version of a route message sent down by the kernel to indicate
* that a route has changed. */
struct route_table_msg {
bool relevant; /* Should this message be processed? */
int nlmsg_type; /* e.g. RTM_NEWROUTE, RTM_DELROUTE. */
struct route_data rd; /* Data parsed from this message. */
};
static struct ovs_mutex route_table_mutex = OVS_MUTEX_INITIALIZER;
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
/* Global change number for route-table, which should be incremented
* every time route_table_reset() is called. */
static uint64_t rt_change_seq;
static struct nln *nln = NULL;
static struct route_table_msg rtmsg;
static struct nln_notifier *route_notifier = NULL;
static struct nln_notifier *name_notifier = NULL;
static bool route_table_valid = false;
static int route_table_reset(void);
static void route_table_handle_msg(const struct route_table_msg *);
static bool route_table_parse(struct ofpbuf *, struct route_table_msg *);
static void route_table_change(const struct route_table_msg *, void *);
static void route_map_clear(void);
static void name_table_init(void);
static void name_table_change(const struct rtnetlink_link_change *, void *);
uint64_t
route_table_get_change_seq(void)
{
return rt_change_seq;
}
/* Users of the route_table module should register themselves with this
* function before making any other route_table function calls. */
void
route_table_init(void)
OVS_EXCLUDED(route_table_mutex)
{
ovs_mutex_lock(&route_table_mutex);
ovs_assert(!nln);
ovs_assert(!route_notifier);
ovs_router_init();
nln = nln_create(NETLINK_ROUTE, RTNLGRP_IPV4_ROUTE,
(nln_parse_func *) route_table_parse, &rtmsg);
route_notifier =
nln_notifier_create(nln, (nln_notify_func *) route_table_change,
NULL);
route_table_reset();
name_table_init();
ovs_mutex_unlock(&route_table_mutex);
}
/* Run periodically to update the locally maintained routing table. */
void
route_table_run(void)
OVS_EXCLUDED(route_table_mutex)
{
ovs_mutex_lock(&route_table_mutex);
if (nln) {
rtnetlink_link_run();
nln_run(nln);
if (!route_table_valid) {
route_table_reset();
}
}
ovs_mutex_unlock(&route_table_mutex);
}
/* Causes poll_block() to wake up when route_table updates are required. */
void
route_table_wait(void)
OVS_EXCLUDED(route_table_mutex)
{
ovs_mutex_lock(&route_table_mutex);
if (nln) {
rtnetlink_link_wait();
nln_wait(nln);
}
ovs_mutex_unlock(&route_table_mutex);
}
static int
route_table_reset(void)
{
struct nl_dump dump;
struct rtgenmsg *rtmsg;
uint64_t reply_stub[NL_DUMP_BUFSIZE / 8];
struct ofpbuf request, reply, buf;
route_map_clear();
route_table_valid = true;
rt_change_seq++;
ofpbuf_init(&request, 0);
nl_msg_put_nlmsghdr(&request, sizeof *rtmsg, RTM_GETROUTE, NLM_F_REQUEST);
rtmsg = ofpbuf_put_zeros(&request, sizeof *rtmsg);
rtmsg->rtgen_family = AF_INET;
nl_dump_start(&dump, NETLINK_ROUTE, &request);
ofpbuf_uninit(&request);
ofpbuf_use_stub(&buf, reply_stub, sizeof reply_stub);
while (nl_dump_next(&dump, &reply, &buf)) {
struct route_table_msg msg;
if (route_table_parse(&reply, &msg)) {
route_table_handle_msg(&msg);
}
}
ofpbuf_uninit(&buf);
return nl_dump_done(&dump);
}
static bool
route_table_parse(struct ofpbuf *buf, struct route_table_msg *change)
{
bool parsed;
static const struct nl_policy policy[] = {
[RTA_DST] = { .type = NL_A_U32, .optional = true },
[RTA_OIF] = { .type = NL_A_U32, .optional = false },
[RTA_GATEWAY] = { .type = NL_A_U32, .optional = true },
};
struct nlattr *attrs[ARRAY_SIZE(policy)];
parsed = nl_policy_parse(buf, NLMSG_HDRLEN + sizeof(struct rtmsg),
policy, attrs, ARRAY_SIZE(policy));
if (parsed) {
const struct rtmsg *rtm;
const struct nlmsghdr *nlmsg;
int rta_oif; /* Output interface index. */
nlmsg = buf->data;
rtm = ofpbuf_at(buf, NLMSG_HDRLEN, sizeof *rtm);
if (rtm->rtm_family != AF_INET) {
VLOG_DBG_RL(&rl, "received non AF_INET rtnetlink route message");
return false;
}
memset(change, 0, sizeof *change);
change->relevant = true;
if (rtm->rtm_scope == RT_SCOPE_NOWHERE) {
change->relevant = false;
}
if (rtm->rtm_type != RTN_UNICAST &&
rtm->rtm_type != RTN_LOCAL) {
change->relevant = false;
}
change->nlmsg_type = nlmsg->nlmsg_type;
change->rd.rtm_dst_len = rtm->rtm_dst_len;
rta_oif = nl_attr_get_u32(attrs[RTA_OIF]);
if (!if_indextoname(rta_oif, change->rd.ifname)) {
int error = errno;
VLOG_DBG_RL(&rl, "Could not find interface name[%u]: %s",
rta_oif, ovs_strerror(error));
return false;
}
if (attrs[RTA_DST]) {
change->rd.rta_dst = nl_attr_get_be32(attrs[RTA_DST]);
}
if (attrs[RTA_GATEWAY]) {
change->rd.rta_gw = nl_attr_get_be32(attrs[RTA_GATEWAY]);
}
} else {
VLOG_DBG_RL(&rl, "received unparseable rtnetlink route message");
}
return parsed;
}
static void
route_table_change(const struct route_table_msg *change OVS_UNUSED,
void *aux OVS_UNUSED)
{
route_table_valid = false;
}
static void
route_table_handle_msg(const struct route_table_msg *change)
{
if (change->relevant && change->nlmsg_type == RTM_NEWROUTE) {
const struct route_data *rd = &change->rd;
ovs_router_insert(rd->rta_dst, rd->rtm_dst_len,
rd->ifname, rd->rta_gw);
}
}
static void
route_map_clear(void)
{
ovs_router_flush();
}
bool
route_table_fallback_lookup(ovs_be32 ip_dst OVS_UNUSED,
char output_bridge[] OVS_UNUSED,
ovs_be32 *gw)
{
*gw = 0;
return false;
}
/* name_table . */
static void
name_table_init(void)
{
name_notifier = rtnetlink_link_notifier_create(name_table_change, NULL);
}
static void
name_table_change(const struct rtnetlink_link_change *change OVS_UNUSED,
void *aux OVS_UNUSED)
{
/* Changes to interface status can cause routing table changes that some
* versions of the linux kernel do not advertise for some reason. */
route_table_valid = false;
}