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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" |
e6211adc | 34 | #include "openvswitch/vlog.h" |
a132aa96 EJ |
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. */ |
e0cc58f9 | 44 | ovs_be32 rta_gw; |
58718f40 | 45 | char ifname[IFNAMSIZ]; /* Interface name. */ |
a132aa96 EJ |
46 | }; |
47 | ||
48 | /* A digested version of a route message sent down by the kernel to indicate | |
49 | * that a route has changed. */ | |
50 | struct route_table_msg { | |
db2dede4 | 51 | bool relevant; /* Should this message be processed? */ |
a132aa96 EJ |
52 | int nlmsg_type; /* e.g. RTM_NEWROUTE, RTM_DELROUTE. */ |
53 | struct route_data rd; /* Data parsed from this message. */ | |
54 | }; | |
55 | ||
3c27dbe6 | 56 | static struct ovs_mutex route_table_mutex = OVS_MUTEX_INITIALIZER; |
a132aa96 EJ |
57 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20); |
58 | ||
41ca1e0a AW |
59 | /* Global change number for route-table, which should be incremented |
60 | * every time route_table_reset() is called. */ | |
61 | static uint64_t rt_change_seq; | |
62 | ||
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 | 76 | static void name_table_init(void); |
b46ccdf5 | 77 | static void name_table_change(const struct rtnetlink_link_change *, void *); |
b46ccdf5 | 78 | |
41ca1e0a AW |
79 | uint64_t |
80 | route_table_get_change_seq(void) | |
81 | { | |
82 | return rt_change_seq; | |
83 | } | |
84 | ||
a132aa96 EJ |
85 | /* Users of the route_table module should register themselves with this |
86 | * function before making any other route_table function calls. */ | |
87 | void | |
b772066f | 88 | route_table_init(void) |
3c27dbe6 | 89 | OVS_EXCLUDED(route_table_mutex) |
a132aa96 | 90 | { |
3c27dbe6 | 91 | ovs_mutex_lock(&route_table_mutex); |
b772066f PS |
92 | ovs_assert(!nln); |
93 | ovs_assert(!route_notifier); | |
a132aa96 | 94 | |
b772066f PS |
95 | ovs_router_init(); |
96 | nln = nln_create(NETLINK_ROUTE, RTNLGRP_IPV4_ROUTE, | |
97 | (nln_parse_func *) route_table_parse, &rtmsg); | |
2ee6545f | 98 | |
b772066f PS |
99 | route_notifier = |
100 | nln_notifier_create(nln, (nln_notify_func *) route_table_change, | |
101 | NULL); | |
a132aa96 | 102 | |
b772066f PS |
103 | route_table_reset(); |
104 | name_table_init(); | |
a132aa96 | 105 | |
3c27dbe6 | 106 | ovs_mutex_unlock(&route_table_mutex); |
a132aa96 EJ |
107 | } |
108 | ||
109 | /* Run periodically to update the locally maintained routing table. */ | |
110 | void | |
111 | route_table_run(void) | |
3c27dbe6 | 112 | OVS_EXCLUDED(route_table_mutex) |
a132aa96 | 113 | { |
3c27dbe6 | 114 | ovs_mutex_lock(&route_table_mutex); |
0a811051 | 115 | if (nln) { |
18a23781 EJ |
116 | rtnetlink_link_run(); |
117 | nln_run(nln); | |
41ca1e0a AW |
118 | |
119 | if (!route_table_valid) { | |
120 | route_table_reset(); | |
121 | } | |
a132aa96 | 122 | } |
3c27dbe6 | 123 | ovs_mutex_unlock(&route_table_mutex); |
a132aa96 EJ |
124 | } |
125 | ||
126 | /* Causes poll_block() to wake up when route_table updates are required. */ | |
127 | void | |
128 | route_table_wait(void) | |
3c27dbe6 | 129 | OVS_EXCLUDED(route_table_mutex) |
a132aa96 | 130 | { |
3c27dbe6 | 131 | ovs_mutex_lock(&route_table_mutex); |
0a811051 | 132 | if (nln) { |
18a23781 EJ |
133 | rtnetlink_link_wait(); |
134 | nln_wait(nln); | |
a132aa96 | 135 | } |
3c27dbe6 | 136 | ovs_mutex_unlock(&route_table_mutex); |
a132aa96 EJ |
137 | } |
138 | ||
139 | static int | |
140 | route_table_reset(void) | |
141 | { | |
a132aa96 EJ |
142 | struct nl_dump dump; |
143 | struct rtgenmsg *rtmsg; | |
d57695d7 JS |
144 | uint64_t reply_stub[NL_DUMP_BUFSIZE / 8]; |
145 | struct ofpbuf request, reply, buf; | |
a132aa96 EJ |
146 | |
147 | route_map_clear(); | |
f0e167f0 | 148 | route_table_valid = true; |
41ca1e0a | 149 | rt_change_seq++; |
a132aa96 | 150 | |
a132aa96 EJ |
151 | ofpbuf_init(&request, 0); |
152 | ||
153 | nl_msg_put_nlmsghdr(&request, sizeof *rtmsg, RTM_GETROUTE, NLM_F_REQUEST); | |
154 | ||
155 | rtmsg = ofpbuf_put_zeros(&request, sizeof *rtmsg); | |
156 | rtmsg->rtgen_family = AF_INET; | |
157 | ||
a88b4e04 | 158 | nl_dump_start(&dump, NETLINK_ROUTE, &request); |
896b3272 | 159 | ofpbuf_uninit(&request); |
a132aa96 | 160 | |
d57695d7 JS |
161 | ofpbuf_use_stub(&buf, reply_stub, sizeof reply_stub); |
162 | while (nl_dump_next(&dump, &reply, &buf)) { | |
a132aa96 EJ |
163 | struct route_table_msg msg; |
164 | ||
165 | if (route_table_parse(&reply, &msg)) { | |
f0e167f0 | 166 | route_table_handle_msg(&msg); |
a132aa96 EJ |
167 | } |
168 | } | |
d57695d7 | 169 | ofpbuf_uninit(&buf); |
a132aa96 | 170 | |
a88b4e04 | 171 | return nl_dump_done(&dump); |
a132aa96 EJ |
172 | } |
173 | ||
174 | ||
175 | static bool | |
176 | route_table_parse(struct ofpbuf *buf, struct route_table_msg *change) | |
177 | { | |
178 | bool parsed; | |
179 | ||
180 | static const struct nl_policy policy[] = { | |
181 | [RTA_DST] = { .type = NL_A_U32, .optional = true }, | |
182 | [RTA_OIF] = { .type = NL_A_U32, .optional = false }, | |
e0cc58f9 | 183 | [RTA_GATEWAY] = { .type = NL_A_U32, .optional = true }, |
a132aa96 EJ |
184 | }; |
185 | ||
37cd552e | 186 | struct nlattr *attrs[ARRAY_SIZE(policy)]; |
a132aa96 EJ |
187 | |
188 | parsed = nl_policy_parse(buf, NLMSG_HDRLEN + sizeof(struct rtmsg), | |
189 | policy, attrs, ARRAY_SIZE(policy)); | |
190 | ||
191 | if (parsed) { | |
192 | const struct rtmsg *rtm; | |
193 | const struct nlmsghdr *nlmsg; | |
58718f40 | 194 | int rta_oif; /* Output interface index. */ |
a132aa96 | 195 | |
6fd6ed71 | 196 | nlmsg = buf->data; |
db5a1019 | 197 | rtm = ofpbuf_at(buf, NLMSG_HDRLEN, sizeof *rtm); |
a132aa96 EJ |
198 | |
199 | if (rtm->rtm_family != AF_INET) { | |
200 | VLOG_DBG_RL(&rl, "received non AF_INET rtnetlink route message"); | |
201 | return false; | |
202 | } | |
203 | ||
204 | memset(change, 0, sizeof *change); | |
db2dede4 EJ |
205 | change->relevant = true; |
206 | ||
207 | if (rtm->rtm_scope == RT_SCOPE_NOWHERE) { | |
208 | change->relevant = false; | |
209 | } | |
210 | ||
211 | if (rtm->rtm_type != RTN_UNICAST && | |
212 | rtm->rtm_type != RTN_LOCAL) { | |
213 | change->relevant = false; | |
214 | } | |
a132aa96 EJ |
215 | change->nlmsg_type = nlmsg->nlmsg_type; |
216 | change->rd.rtm_dst_len = rtm->rtm_dst_len; | |
58718f40 PS |
217 | rta_oif = nl_attr_get_u32(attrs[RTA_OIF]); |
218 | ||
219 | if (!if_indextoname(rta_oif, change->rd.ifname)) { | |
220 | int error = errno; | |
221 | ||
222 | VLOG_DBG_RL(&rl, "Could not find interface name[%u]: %s", | |
223 | rta_oif, ovs_strerror(error)); | |
224 | return false; | |
225 | } | |
a132aa96 EJ |
226 | |
227 | if (attrs[RTA_DST]) { | |
d9b4ebc5 | 228 | change->rd.rta_dst = nl_attr_get_be32(attrs[RTA_DST]); |
a132aa96 | 229 | } |
e0cc58f9 PS |
230 | if (attrs[RTA_GATEWAY]) { |
231 | change->rd.rta_gw = nl_attr_get_be32(attrs[RTA_GATEWAY]); | |
232 | } | |
233 | ||
a132aa96 EJ |
234 | |
235 | } else { | |
236 | VLOG_DBG_RL(&rl, "received unparseable rtnetlink route message"); | |
237 | } | |
238 | ||
239 | return parsed; | |
240 | } | |
241 | ||
242 | static void | |
f0e167f0 EJ |
243 | route_table_change(const struct route_table_msg *change OVS_UNUSED, |
244 | void *aux OVS_UNUSED) | |
a132aa96 | 245 | { |
f0e167f0 EJ |
246 | route_table_valid = false; |
247 | } | |
248 | ||
249 | static void | |
250 | route_table_handle_msg(const struct route_table_msg *change) | |
251 | { | |
d9b4ebc5 PS |
252 | if (change->relevant && change->nlmsg_type == RTM_NEWROUTE) { |
253 | const struct route_data *rd = &change->rd; | |
a132aa96 | 254 | |
e0cc58f9 PS |
255 | ovs_router_insert(rd->rta_dst, rd->rtm_dst_len, |
256 | rd->ifname, rd->rta_gw); | |
a132aa96 EJ |
257 | } |
258 | } | |
259 | ||
a132aa96 EJ |
260 | static void |
261 | route_map_clear(void) | |
262 | { | |
d9b4ebc5 | 263 | ovs_router_flush(); |
a132aa96 EJ |
264 | } |
265 | ||
88ffdc93 YT |
266 | bool |
267 | route_table_fallback_lookup(ovs_be32 ip_dst OVS_UNUSED, | |
268 | char output_bridge[] OVS_UNUSED, | |
269 | ovs_be32 *gw) | |
270 | { | |
271 | *gw = 0; | |
272 | return false; | |
273 | } | |
274 | ||
b46ccdf5 EJ |
275 | \f |
276 | /* name_table . */ | |
277 | ||
278 | static void | |
279 | name_table_init(void) | |
280 | { | |
2ee6545f | 281 | name_notifier = rtnetlink_link_notifier_create(name_table_change, NULL); |
b46ccdf5 EJ |
282 | } |
283 | ||
b46ccdf5 EJ |
284 | |
285 | static void | |
286 | name_table_change(const struct rtnetlink_link_change *change OVS_UNUSED, | |
287 | void *aux OVS_UNUSED) | |
288 | { | |
289 | /* Changes to interface status can cause routing table changes that some | |
290 | * versions of the linux kernel do not advertise for some reason. */ | |
291 | route_table_valid = false; | |
b46ccdf5 | 292 | } |