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a132aa96 | 1 | /* |
41ca1e0a | 2 | * Copyright (c) 2011, 2012, 2013, 2014 Nicira, Inc. |
a132aa96 EJ |
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 | ||
19 | #include "route-table.h" | |
20 | ||
58718f40 | 21 | #include <errno.h> |
a132aa96 EJ |
22 | #include <arpa/inet.h> |
23 | #include <sys/socket.h> | |
24 | #include <linux/rtnetlink.h> | |
25 | #include <net/if.h> | |
26 | ||
27 | #include "hash.h" | |
a132aa96 | 28 | #include "netlink.h" |
45c8d3a1 | 29 | #include "netlink-notifier.h" |
a132aa96 EJ |
30 | #include "netlink-socket.h" |
31 | #include "ofpbuf.h" | |
d9b4ebc5 | 32 | #include "ovs-router.h" |
b46ccdf5 | 33 | #include "rtnetlink-link.h" |
a132aa96 EJ |
34 | #include "vlog.h" |
35 | ||
36 | VLOG_DEFINE_THIS_MODULE(route_table); | |
37 | ||
38 | struct route_data { | |
39 | /* Copied from struct rtmsg. */ | |
40 | unsigned char rtm_dst_len; | |
41 | ||
42 | /* Extracted from Netlink attributes. */ | |
d9b4ebc5 | 43 | ovs_be32 rta_dst; /* 0 if missing. */ |
58718f40 | 44 | char ifname[IFNAMSIZ]; /* Interface name. */ |
a132aa96 EJ |
45 | }; |
46 | ||
47 | /* A digested version of a route message sent down by the kernel to indicate | |
48 | * that a route has changed. */ | |
49 | struct route_table_msg { | |
db2dede4 | 50 | bool relevant; /* Should this message be processed? */ |
a132aa96 EJ |
51 | int nlmsg_type; /* e.g. RTM_NEWROUTE, RTM_DELROUTE. */ |
52 | struct route_data rd; /* Data parsed from this message. */ | |
53 | }; | |
54 | ||
3c27dbe6 | 55 | static struct ovs_mutex route_table_mutex = OVS_MUTEX_INITIALIZER; |
a132aa96 EJ |
56 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20); |
57 | ||
41ca1e0a AW |
58 | /* Global change number for route-table, which should be incremented |
59 | * every time route_table_reset() is called. */ | |
60 | static uint64_t rt_change_seq; | |
61 | ||
a132aa96 | 62 | static unsigned int register_count = 0; |
0a811051 | 63 | static struct nln *nln = NULL; |
a132aa96 | 64 | static struct route_table_msg rtmsg; |
2ee6545f EJ |
65 | static struct nln_notifier *route_notifier = NULL; |
66 | static struct nln_notifier *name_notifier = NULL; | |
f0e167f0 EJ |
67 | |
68 | static bool route_table_valid = false; | |
a132aa96 EJ |
69 | |
70 | static int route_table_reset(void); | |
f0e167f0 | 71 | static void route_table_handle_msg(const struct route_table_msg *); |
a132aa96 EJ |
72 | static bool route_table_parse(struct ofpbuf *, struct route_table_msg *); |
73 | static void route_table_change(const struct route_table_msg *, void *); | |
a132aa96 | 74 | static void route_map_clear(void); |
a132aa96 | 75 | |
b46ccdf5 EJ |
76 | static void name_table_init(void); |
77 | static void name_table_uninit(void); | |
b46ccdf5 | 78 | static void name_table_change(const struct rtnetlink_link_change *, void *); |
b46ccdf5 | 79 | |
41ca1e0a AW |
80 | uint64_t |
81 | route_table_get_change_seq(void) | |
82 | { | |
83 | return rt_change_seq; | |
84 | } | |
85 | ||
a132aa96 EJ |
86 | /* Users of the route_table module should register themselves with this |
87 | * function before making any other route_table function calls. */ | |
88 | void | |
89 | route_table_register(void) | |
3c27dbe6 | 90 | OVS_EXCLUDED(route_table_mutex) |
a132aa96 | 91 | { |
3c27dbe6 | 92 | ovs_mutex_lock(&route_table_mutex); |
a132aa96 | 93 | if (!register_count) { |
cb22974d BP |
94 | ovs_assert(!nln); |
95 | ovs_assert(!route_notifier); | |
a132aa96 | 96 | |
0a811051 EJ |
97 | nln = nln_create(NETLINK_ROUTE, RTNLGRP_IPV4_ROUTE, |
98 | (nln_parse_func *) route_table_parse, &rtmsg); | |
2ee6545f EJ |
99 | |
100 | route_notifier = | |
101 | nln_notifier_create(nln, (nln_notify_func *) route_table_change, | |
102 | NULL); | |
a132aa96 | 103 | |
a132aa96 | 104 | route_table_reset(); |
b46ccdf5 | 105 | name_table_init(); |
a132aa96 EJ |
106 | } |
107 | ||
108 | register_count++; | |
3c27dbe6 | 109 | ovs_mutex_unlock(&route_table_mutex); |
a132aa96 EJ |
110 | } |
111 | ||
112 | /* Users of the route_table module should unregister themselves with this | |
113 | * function when they will no longer be making any more route_table fuction | |
114 | * calls. */ | |
115 | void | |
116 | route_table_unregister(void) | |
3c27dbe6 | 117 | OVS_EXCLUDED(route_table_mutex) |
a132aa96 | 118 | { |
3c27dbe6 | 119 | ovs_mutex_lock(&route_table_mutex); |
a132aa96 EJ |
120 | register_count--; |
121 | ||
122 | if (!register_count) { | |
f4dc8c58 | 123 | nln_notifier_destroy(route_notifier); |
2f0dc471 | 124 | route_notifier = NULL; |
0a811051 EJ |
125 | nln_destroy(nln); |
126 | nln = NULL; | |
a132aa96 EJ |
127 | |
128 | route_map_clear(); | |
b46ccdf5 | 129 | name_table_uninit(); |
a132aa96 | 130 | } |
3c27dbe6 | 131 | ovs_mutex_unlock(&route_table_mutex); |
a132aa96 EJ |
132 | } |
133 | ||
134 | /* Run periodically to update the locally maintained routing table. */ | |
135 | void | |
136 | route_table_run(void) | |
3c27dbe6 | 137 | OVS_EXCLUDED(route_table_mutex) |
a132aa96 | 138 | { |
3c27dbe6 | 139 | ovs_mutex_lock(&route_table_mutex); |
0a811051 | 140 | if (nln) { |
18a23781 EJ |
141 | rtnetlink_link_run(); |
142 | nln_run(nln); | |
41ca1e0a AW |
143 | |
144 | if (!route_table_valid) { | |
145 | route_table_reset(); | |
146 | } | |
a132aa96 | 147 | } |
3c27dbe6 | 148 | ovs_mutex_unlock(&route_table_mutex); |
a132aa96 EJ |
149 | } |
150 | ||
151 | /* Causes poll_block() to wake up when route_table updates are required. */ | |
152 | void | |
153 | route_table_wait(void) | |
3c27dbe6 | 154 | OVS_EXCLUDED(route_table_mutex) |
a132aa96 | 155 | { |
3c27dbe6 | 156 | ovs_mutex_lock(&route_table_mutex); |
0a811051 | 157 | if (nln) { |
18a23781 EJ |
158 | rtnetlink_link_wait(); |
159 | nln_wait(nln); | |
a132aa96 | 160 | } |
3c27dbe6 | 161 | ovs_mutex_unlock(&route_table_mutex); |
a132aa96 EJ |
162 | } |
163 | ||
164 | static int | |
165 | route_table_reset(void) | |
166 | { | |
a132aa96 EJ |
167 | struct nl_dump dump; |
168 | struct rtgenmsg *rtmsg; | |
d57695d7 JS |
169 | uint64_t reply_stub[NL_DUMP_BUFSIZE / 8]; |
170 | struct ofpbuf request, reply, buf; | |
a132aa96 EJ |
171 | |
172 | route_map_clear(); | |
f0e167f0 | 173 | route_table_valid = true; |
41ca1e0a | 174 | rt_change_seq++; |
a132aa96 | 175 | |
a132aa96 EJ |
176 | ofpbuf_init(&request, 0); |
177 | ||
178 | nl_msg_put_nlmsghdr(&request, sizeof *rtmsg, RTM_GETROUTE, NLM_F_REQUEST); | |
179 | ||
180 | rtmsg = ofpbuf_put_zeros(&request, sizeof *rtmsg); | |
181 | rtmsg->rtgen_family = AF_INET; | |
182 | ||
a88b4e04 | 183 | nl_dump_start(&dump, NETLINK_ROUTE, &request); |
896b3272 | 184 | ofpbuf_uninit(&request); |
a132aa96 | 185 | |
d57695d7 JS |
186 | ofpbuf_use_stub(&buf, reply_stub, sizeof reply_stub); |
187 | while (nl_dump_next(&dump, &reply, &buf)) { | |
a132aa96 EJ |
188 | struct route_table_msg msg; |
189 | ||
190 | if (route_table_parse(&reply, &msg)) { | |
f0e167f0 | 191 | route_table_handle_msg(&msg); |
a132aa96 EJ |
192 | } |
193 | } | |
d57695d7 | 194 | ofpbuf_uninit(&buf); |
a132aa96 | 195 | |
a88b4e04 | 196 | return nl_dump_done(&dump); |
a132aa96 EJ |
197 | } |
198 | ||
199 | ||
200 | static bool | |
201 | route_table_parse(struct ofpbuf *buf, struct route_table_msg *change) | |
202 | { | |
203 | bool parsed; | |
204 | ||
205 | static const struct nl_policy policy[] = { | |
206 | [RTA_DST] = { .type = NL_A_U32, .optional = true }, | |
207 | [RTA_OIF] = { .type = NL_A_U32, .optional = false }, | |
208 | }; | |
209 | ||
37cd552e | 210 | struct nlattr *attrs[ARRAY_SIZE(policy)]; |
a132aa96 EJ |
211 | |
212 | parsed = nl_policy_parse(buf, NLMSG_HDRLEN + sizeof(struct rtmsg), | |
213 | policy, attrs, ARRAY_SIZE(policy)); | |
214 | ||
215 | if (parsed) { | |
216 | const struct rtmsg *rtm; | |
217 | const struct nlmsghdr *nlmsg; | |
58718f40 | 218 | int rta_oif; /* Output interface index. */ |
a132aa96 | 219 | |
1f317cb5 | 220 | nlmsg = ofpbuf_data(buf); |
db5a1019 | 221 | rtm = ofpbuf_at(buf, NLMSG_HDRLEN, sizeof *rtm); |
a132aa96 EJ |
222 | |
223 | if (rtm->rtm_family != AF_INET) { | |
224 | VLOG_DBG_RL(&rl, "received non AF_INET rtnetlink route message"); | |
225 | return false; | |
226 | } | |
227 | ||
228 | memset(change, 0, sizeof *change); | |
db2dede4 EJ |
229 | change->relevant = true; |
230 | ||
231 | if (rtm->rtm_scope == RT_SCOPE_NOWHERE) { | |
232 | change->relevant = false; | |
233 | } | |
234 | ||
235 | if (rtm->rtm_type != RTN_UNICAST && | |
236 | rtm->rtm_type != RTN_LOCAL) { | |
237 | change->relevant = false; | |
238 | } | |
a132aa96 EJ |
239 | change->nlmsg_type = nlmsg->nlmsg_type; |
240 | change->rd.rtm_dst_len = rtm->rtm_dst_len; | |
58718f40 PS |
241 | rta_oif = nl_attr_get_u32(attrs[RTA_OIF]); |
242 | ||
243 | if (!if_indextoname(rta_oif, change->rd.ifname)) { | |
244 | int error = errno; | |
245 | ||
246 | VLOG_DBG_RL(&rl, "Could not find interface name[%u]: %s", | |
247 | rta_oif, ovs_strerror(error)); | |
248 | return false; | |
249 | } | |
a132aa96 EJ |
250 | |
251 | if (attrs[RTA_DST]) { | |
d9b4ebc5 | 252 | change->rd.rta_dst = nl_attr_get_be32(attrs[RTA_DST]); |
a132aa96 EJ |
253 | } |
254 | ||
255 | } else { | |
256 | VLOG_DBG_RL(&rl, "received unparseable rtnetlink route message"); | |
257 | } | |
258 | ||
259 | return parsed; | |
260 | } | |
261 | ||
262 | static void | |
f0e167f0 EJ |
263 | route_table_change(const struct route_table_msg *change OVS_UNUSED, |
264 | void *aux OVS_UNUSED) | |
a132aa96 | 265 | { |
f0e167f0 EJ |
266 | route_table_valid = false; |
267 | } | |
268 | ||
269 | static void | |
270 | route_table_handle_msg(const struct route_table_msg *change) | |
271 | { | |
d9b4ebc5 PS |
272 | if (change->relevant && change->nlmsg_type == RTM_NEWROUTE) { |
273 | const struct route_data *rd = &change->rd; | |
a132aa96 | 274 | |
d9b4ebc5 | 275 | ovs_router_insert(rd->rta_dst, rd->rtm_dst_len, rd->ifname, 0); |
a132aa96 EJ |
276 | } |
277 | } | |
278 | ||
a132aa96 EJ |
279 | static void |
280 | route_map_clear(void) | |
281 | { | |
d9b4ebc5 | 282 | ovs_router_flush(); |
a132aa96 EJ |
283 | } |
284 | ||
b46ccdf5 EJ |
285 | \f |
286 | /* name_table . */ | |
287 | ||
288 | static void | |
289 | name_table_init(void) | |
290 | { | |
2ee6545f | 291 | name_notifier = rtnetlink_link_notifier_create(name_table_change, NULL); |
b46ccdf5 EJ |
292 | } |
293 | ||
294 | static void | |
295 | name_table_uninit(void) | |
296 | { | |
2ee6545f EJ |
297 | rtnetlink_link_notifier_destroy(name_notifier); |
298 | name_notifier = NULL; | |
b46ccdf5 EJ |
299 | } |
300 | ||
301 | static void | |
302 | name_table_change(const struct rtnetlink_link_change *change OVS_UNUSED, | |
303 | void *aux OVS_UNUSED) | |
304 | { | |
305 | /* Changes to interface status can cause routing table changes that some | |
306 | * versions of the linux kernel do not advertise for some reason. */ | |
307 | route_table_valid = false; | |
b46ccdf5 | 308 | } |