2 * Copyright (c) 2012 Ed Maste. All rights reserved.
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:
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
19 #include "route-table.h"
21 #include <sys/socket.h>
22 #include <sys/types.h>
25 #include <net/route.h>
26 #include <net/if_dl.h>
27 #include <netinet/in.h>
34 #include "ovs-router.h"
36 #include "openvswitch/vlog.h"
39 VLOG_DEFINE_THIS_MODULE(route_table_bsd);
41 /* OS X does not define RT_ROUNDUP() or equivalent macro. */
43 #define RT_ROUNDUP(l) ((l) > 0 ? ROUND_UP((l), sizeof(long)) : sizeof(long))
47 route_table_fallback_lookup(const struct in6_addr *ip6_dst, char name[],
56 struct rt_msghdr *rtm = &rtmsg.rtm;
57 struct sockaddr_dl *ifp = NULL;
58 struct sockaddr_in *sin;
61 int i, namelen, rtsock;
63 const pid_t pid = getpid();
65 unsigned int retry_count = 5; /* arbitrary */
67 if (!IN6_IS_ADDR_V4MAPPED(ip6_dst)) {
70 ip = in6_addr_get_mapped_ipv4(ip6_dst);
72 VLOG_DBG("looking route up for " IP_FMT " pid %" PRIuMAX,
73 IP_ARGS(ip), (uintmax_t)pid);
75 rtsock = socket(PF_ROUTE, SOCK_RAW, 0);
80 memset(&rtmsg, 0, sizeof(rtmsg));
81 rtm->rtm_msglen = sizeof(struct rt_msghdr) + sizeof(struct sockaddr_in);
82 rtm->rtm_version = RTM_VERSION;
83 rtm->rtm_type = RTM_GET;
84 rtm->rtm_addrs = RTA_DST | RTA_IFP;
87 sin = (struct sockaddr_in *)(rtm + 1);
88 sin->sin_len = len = sizeof(struct sockaddr_in);
89 sin->sin_family = AF_INET;
90 sin->sin_addr.s_addr = ip;
92 len = write(rtsock, (char *)&rtmsg, rtm->rtm_msglen);
94 if (errno == ENOBUFS && retry_count-- > 0) {
95 VLOG_INFO("Recoverable error writing to routing socket: %s",
97 usleep(500 * 1000); /* arbitrary */
100 VLOG_ERR("Error writing to routing socket: %s", ovs_strerror(errno));
104 if (len != rtm->rtm_msglen) {
105 VLOG_ERR("Short write to routing socket");
114 memset(&pfd, 0, sizeof(pfd));
118 * The timeout value below is somehow arbitrary.
119 * It's to detect the lost of routing messages due to
120 * buffer exhaustion etc. The routing socket is not
123 ret = poll(&pfd, 1, 500);
125 VLOG_ERR("Error polling on routing socket: %s",
126 ovs_strerror(errno));
131 if (retry_count-- > 0) {
132 VLOG_INFO("Timeout; resending routing message");
138 len = read(rtsock, (char *)&rtmsg, sizeof(rtmsg));
140 VLOG_DBG("got rtmsg pid %" PRIuMAX " seq %d",
141 (uintmax_t)rtmsg.rtm.rtm_pid,
144 } while (len > 0 && (rtmsg.rtm.rtm_seq != seq ||
145 rtmsg.rtm.rtm_pid != pid));
148 VLOG_ERR("Error reading from routing socket: %s", ovs_strerror(errno));
153 sa = (struct sockaddr *)(rtm + 1);
154 for (i = 1; i; i <<= 1) {
155 if (rtm->rtm_addrs & i) {
156 if (i == RTA_IFP && sa->sa_family == AF_LINK &&
157 ALIGNED_CAST(struct sockaddr_dl *, sa)->sdl_nlen) {
158 ifp = ALIGNED_CAST(struct sockaddr_dl *, sa);
159 namelen = ifp->sdl_nlen;
160 if (namelen > IFNAMSIZ - 1)
161 namelen = IFNAMSIZ - 1;
162 memcpy(name, ifp->sdl_data, namelen);
163 name[namelen] = '\0';
164 VLOG_DBG("got ifp %s", name);
166 } else if (i == RTA_GATEWAY && sa->sa_family == AF_INET) {
167 const struct sockaddr_in *sin_dst =
168 ALIGNED_CAST(struct sockaddr_in *, sa);
170 in6_addr_set_mapped_ipv4(gw6, sin_dst->sin_addr.s_addr);
171 VLOG_DBG("got gateway " IP_FMT, IP_ARGS(sin_dst->sin_addr.s_addr));
173 #if defined(__FreeBSD__)
174 sa = (struct sockaddr *)((char *)sa + SA_SIZE(sa));
175 #elif defined(__NetBSD__)
176 sa = (struct sockaddr *)((char *)sa + RT_ROUNDUP(sa->sa_len));
177 #elif defined(__MACH__)
178 sa = (struct sockaddr *)((char *)sa + RT_ROUNDUP(sa->sa_len));
188 route_table_get_change_seq(void)
194 route_table_init(void)
200 route_table_run(void)
205 route_table_wait(void)