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https://github.com/openvswitch/ovs
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b2befd5bb2
FreeBSD insists that <sys/types.h> be included before <netinet/in.h> and that <netinet/in.h> be included before <arpa/inet.h>. This adds guards to the "sparse" headers to yield a warning if this order is violated. This commit also adjusts the order of many #includes to suit this requirement. Signed-off-by: Ben Pfaff <blp@ovn.org> Acked-by: Justin Pettit <jpettit@ovn.org>
352 lines
10 KiB
C
352 lines
10 KiB
C
/*
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* Copyright (c) 2011, 2012, 2013, 2014, 2017 Nicira, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <config.h>
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#include "route-table.h"
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#include <errno.h>
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#include <linux/rtnetlink.h>
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#include <net/if.h>
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#include "hash.h"
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#include "netdev.h"
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#include "netlink.h"
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#include "netlink-notifier.h"
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#include "netlink-socket.h"
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#include "openvswitch/ofpbuf.h"
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#include "ovs-router.h"
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#include "packets.h"
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#include "rtnetlink.h"
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#include "tnl-ports.h"
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#include "openvswitch/vlog.h"
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/* Linux 2.6.36 added RTA_MARK, so define it just in case we're building with
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* old headers. (We can't test for it with #ifdef because it's an enum.) */
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#define RTA_MARK 16
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VLOG_DEFINE_THIS_MODULE(route_table);
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struct route_data {
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/* Copied from struct rtmsg. */
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unsigned char rtm_dst_len;
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/* Extracted from Netlink attributes. */
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struct in6_addr rta_dst; /* 0 if missing. */
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struct in6_addr rta_gw;
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char ifname[IFNAMSIZ]; /* Interface name. */
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uint32_t mark;
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};
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/* A digested version of a route message sent down by the kernel to indicate
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* that a route has changed. */
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struct route_table_msg {
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bool relevant; /* Should this message be processed? */
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int nlmsg_type; /* e.g. RTM_NEWROUTE, RTM_DELROUTE. */
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struct route_data rd; /* Data parsed from this message. */
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};
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static struct ovs_mutex route_table_mutex = OVS_MUTEX_INITIALIZER;
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static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
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/* Global change number for route-table, which should be incremented
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* every time route_table_reset() is called. */
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static uint64_t rt_change_seq;
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static struct nln *nln = NULL;
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static struct route_table_msg rtmsg;
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static struct nln_notifier *route_notifier = NULL;
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static struct nln_notifier *route6_notifier = NULL;
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static struct nln_notifier *name_notifier = NULL;
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static bool route_table_valid = false;
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static int route_table_reset(void);
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static void route_table_handle_msg(const struct route_table_msg *);
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static int route_table_parse(struct ofpbuf *, struct route_table_msg *);
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static void route_table_change(const struct route_table_msg *, void *);
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static void route_map_clear(void);
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static void name_table_init(void);
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static void name_table_change(const struct rtnetlink_change *, void *);
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uint64_t
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route_table_get_change_seq(void)
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{
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return rt_change_seq;
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}
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/* Users of the route_table module should register themselves with this
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* function before making any other route_table function calls. */
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void
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route_table_init(void)
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OVS_EXCLUDED(route_table_mutex)
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{
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ovs_mutex_lock(&route_table_mutex);
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ovs_assert(!nln);
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ovs_assert(!route_notifier);
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ovs_assert(!route6_notifier);
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ovs_router_init();
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nln = nln_create(NETLINK_ROUTE, (nln_parse_func *) route_table_parse,
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&rtmsg);
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route_notifier =
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nln_notifier_create(nln, RTNLGRP_IPV4_ROUTE,
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(nln_notify_func *) route_table_change, NULL);
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route6_notifier =
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nln_notifier_create(nln, RTNLGRP_IPV6_ROUTE,
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(nln_notify_func *) route_table_change, NULL);
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route_table_reset();
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name_table_init();
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ovs_mutex_unlock(&route_table_mutex);
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}
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/* Run periodically to update the locally maintained routing table. */
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void
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route_table_run(void)
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OVS_EXCLUDED(route_table_mutex)
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{
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ovs_mutex_lock(&route_table_mutex);
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if (nln) {
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rtnetlink_run();
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nln_run(nln);
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if (!route_table_valid) {
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route_table_reset();
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}
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}
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ovs_mutex_unlock(&route_table_mutex);
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}
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/* Causes poll_block() to wake up when route_table updates are required. */
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void
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route_table_wait(void)
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OVS_EXCLUDED(route_table_mutex)
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{
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ovs_mutex_lock(&route_table_mutex);
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if (nln) {
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rtnetlink_wait();
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nln_wait(nln);
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}
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ovs_mutex_unlock(&route_table_mutex);
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}
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static int
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route_table_reset(void)
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{
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struct nl_dump dump;
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struct rtgenmsg *rtmsg;
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uint64_t reply_stub[NL_DUMP_BUFSIZE / 8];
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struct ofpbuf request, reply, buf;
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route_map_clear();
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netdev_get_addrs_list_flush();
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route_table_valid = true;
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rt_change_seq++;
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ofpbuf_init(&request, 0);
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nl_msg_put_nlmsghdr(&request, sizeof *rtmsg, RTM_GETROUTE, NLM_F_REQUEST);
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rtmsg = ofpbuf_put_zeros(&request, sizeof *rtmsg);
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rtmsg->rtgen_family = AF_UNSPEC;
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nl_dump_start(&dump, NETLINK_ROUTE, &request);
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ofpbuf_uninit(&request);
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ofpbuf_use_stub(&buf, reply_stub, sizeof reply_stub);
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while (nl_dump_next(&dump, &reply, &buf)) {
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struct route_table_msg msg;
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if (route_table_parse(&reply, &msg)) {
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route_table_handle_msg(&msg);
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}
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}
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ofpbuf_uninit(&buf);
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return nl_dump_done(&dump);
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}
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/* Return RTNLGRP_IPV4_ROUTE or RTNLGRP_IPV6_ROUTE on success, 0 on parse
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* error. */
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static int
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route_table_parse(struct ofpbuf *buf, struct route_table_msg *change)
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{
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bool parsed, ipv4 = false;
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static const struct nl_policy policy[] = {
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[RTA_DST] = { .type = NL_A_U32, .optional = true },
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[RTA_OIF] = { .type = NL_A_U32, .optional = true },
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[RTA_GATEWAY] = { .type = NL_A_U32, .optional = true },
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[RTA_MARK] = { .type = NL_A_U32, .optional = true },
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};
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static const struct nl_policy policy6[] = {
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[RTA_DST] = { .type = NL_A_IPV6, .optional = true },
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[RTA_OIF] = { .type = NL_A_U32, .optional = true },
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[RTA_MARK] = { .type = NL_A_U32, .optional = true },
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[RTA_GATEWAY] = { .type = NL_A_IPV6, .optional = true },
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};
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struct nlattr *attrs[ARRAY_SIZE(policy)];
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const struct rtmsg *rtm;
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rtm = ofpbuf_at(buf, NLMSG_HDRLEN, sizeof *rtm);
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if (rtm->rtm_family == AF_INET) {
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parsed = nl_policy_parse(buf, NLMSG_HDRLEN + sizeof(struct rtmsg),
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policy, attrs, ARRAY_SIZE(policy));
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ipv4 = true;
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} else if (rtm->rtm_family == AF_INET6) {
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parsed = nl_policy_parse(buf, NLMSG_HDRLEN + sizeof(struct rtmsg),
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policy6, attrs, ARRAY_SIZE(policy6));
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} else {
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VLOG_DBG_RL(&rl, "received non AF_INET rtnetlink route message");
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return 0;
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}
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if (parsed) {
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const struct nlmsghdr *nlmsg;
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int rta_oif; /* Output interface index. */
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nlmsg = buf->data;
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memset(change, 0, sizeof *change);
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change->relevant = true;
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if (rtm->rtm_scope == RT_SCOPE_NOWHERE) {
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change->relevant = false;
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}
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if (rtm->rtm_type != RTN_UNICAST &&
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rtm->rtm_type != RTN_LOCAL) {
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change->relevant = false;
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}
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change->nlmsg_type = nlmsg->nlmsg_type;
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change->rd.rtm_dst_len = rtm->rtm_dst_len + (ipv4 ? 96 : 0);
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if (attrs[RTA_OIF]) {
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rta_oif = nl_attr_get_u32(attrs[RTA_OIF]);
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if (!if_indextoname(rta_oif, change->rd.ifname)) {
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int error = errno;
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VLOG_DBG_RL(&rl, "Could not find interface name[%u]: %s",
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rta_oif, ovs_strerror(error));
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if (error == ENXIO) {
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change->relevant = false;
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} else {
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return 0;
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}
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}
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}
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if (attrs[RTA_DST]) {
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if (ipv4) {
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ovs_be32 dst;
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dst = nl_attr_get_be32(attrs[RTA_DST]);
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in6_addr_set_mapped_ipv4(&change->rd.rta_dst, dst);
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} else {
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change->rd.rta_dst = nl_attr_get_in6_addr(attrs[RTA_DST]);
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}
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} else if (ipv4) {
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in6_addr_set_mapped_ipv4(&change->rd.rta_dst, 0);
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}
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if (attrs[RTA_GATEWAY]) {
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if (ipv4) {
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ovs_be32 gw;
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gw = nl_attr_get_be32(attrs[RTA_GATEWAY]);
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in6_addr_set_mapped_ipv4(&change->rd.rta_gw, gw);
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} else {
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change->rd.rta_gw = nl_attr_get_in6_addr(attrs[RTA_GATEWAY]);
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}
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}
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if (attrs[RTA_MARK]) {
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change->rd.mark = nl_attr_get_u32(attrs[RTA_MARK]);
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}
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} else {
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VLOG_DBG_RL(&rl, "received unparseable rtnetlink route message");
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return 0;
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}
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/* Success. */
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return ipv4 ? RTNLGRP_IPV4_ROUTE : RTNLGRP_IPV6_ROUTE;
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}
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static void
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route_table_change(const struct route_table_msg *change OVS_UNUSED,
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void *aux OVS_UNUSED)
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{
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route_table_valid = false;
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}
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static void
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route_table_handle_msg(const struct route_table_msg *change)
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{
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if (change->relevant && change->nlmsg_type == RTM_NEWROUTE) {
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const struct route_data *rd = &change->rd;
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ovs_router_insert(rd->mark, &rd->rta_dst, rd->rtm_dst_len,
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rd->ifname, &rd->rta_gw);
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}
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}
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static void
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route_map_clear(void)
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{
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ovs_router_flush();
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}
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bool
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route_table_fallback_lookup(const struct in6_addr *ip6_dst OVS_UNUSED,
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char name[] OVS_UNUSED,
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struct in6_addr *gw6)
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{
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*gw6 = in6addr_any;
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return false;
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}
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/* name_table . */
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static void
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name_table_init(void)
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{
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name_notifier = rtnetlink_notifier_create(name_table_change, NULL);
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}
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static void
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name_table_change(const struct rtnetlink_change *change,
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void *aux OVS_UNUSED)
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{
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/* Changes to interface status can cause routing table changes that some
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* versions of the linux kernel do not advertise for some reason. */
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route_table_valid = false;
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if (change && change->nlmsg_type == RTM_DELLINK) {
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if (change->ifname) {
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tnl_port_map_delete_ipdev(change->ifname);
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}
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}
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}
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