c41100dbf4e7a683375848114a3fdc2122ddd91b
2 * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License v2 as published by
6 * the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
18 #include <sys/socket.h>
25 #include <linux/fib_rules.h>
29 static struct uloop_fd rtnl_sock
;
30 static unsigned int rtnl_seq
, rtnl_dump_seq
;
31 int route_table
= 16800;
33 static void rtnl_flush(void)
37 fd
= open("/proc/sys/net/ipv4/route/flush", O_WRONLY
);
45 static void rtnl_route_request(struct relayd_interface
*rif
, struct relayd_host
*host
, bool add
)
64 .nlmsg_len
= sizeof(req
),
67 .rtm_family
= AF_INET
,
69 .rtm_table
= RT_TABLE_MAIN
,
72 .rta_type
= RTA_TABLE
,
73 .rta_len
= sizeof(req
.table
),
77 .rta_len
= sizeof(req
.dst
),
81 .rta_len
= sizeof(req
.dev
),
85 memcpy(req
.dst
.ipaddr
, host
->ipaddr
, sizeof(req
.dst
.ipaddr
));
86 req
.dev
.ifindex
= host
->rif
->sll
.sll_ifindex
;
87 req
.table
.table
= rif
->rt_table
;
89 req
.nl
.nlmsg_flags
= NLM_F_REQUEST
;
91 req
.nl
.nlmsg_type
= RTM_NEWROUTE
;
92 req
.nl
.nlmsg_flags
|= NLM_F_CREATE
| NLM_F_REPLACE
;
94 req
.rt
.rtm_protocol
= RTPROT_BOOT
;
95 req
.rt
.rtm_scope
= RT_SCOPE_LINK
;
96 req
.rt
.rtm_type
= RTN_UNICAST
;
98 req
.nl
.nlmsg_type
= RTM_DELROUTE
;
99 req
.rt
.rtm_scope
= RT_SCOPE_NOWHERE
;
102 send(rtnl_sock
.fd
, &req
, sizeof(req
), 0);
106 static void rtnl_rule_request(struct relayd_interface
*rif
, bool add
)
117 char ifname
[IFNAMSIZ
+ 1];
121 .rtm_family
= AF_INET
,
122 .rtm_table
= RT_TABLE_UNSPEC
,
123 .rtm_scope
= RT_SCOPE_UNIVERSE
,
124 .rtm_protocol
= RTPROT_BOOT
,
127 .rta_type
= FRA_TABLE
,
128 .rta_len
= sizeof(req
.table
),
131 .rta_type
= FRA_IFNAME
,
135 int padding
= sizeof(req
.dev
.ifname
);
136 padding
-= strlen(rif
->ifname
) + 1;
138 strcpy(req
.dev
.ifname
, rif
->ifname
);
139 req
.dev
.rta
.rta_len
= sizeof(req
.dev
.rta
) + strlen(rif
->ifname
) + 1;
140 req
.table
.table
= rif
->rt_table
;
141 req
.nl
.nlmsg_len
= sizeof(req
) - padding
;
143 req
.nl
.nlmsg_flags
= NLM_F_REQUEST
;
145 req
.nl
.nlmsg_type
= RTM_NEWRULE
;
146 req
.nl
.nlmsg_flags
|= NLM_F_CREATE
| NLM_F_EXCL
;
148 req
.rt
.rtm_type
= RTN_UNICAST
;
150 req
.nl
.nlmsg_type
= RTM_DELRULE
;
151 req
.rt
.rtm_type
= RTN_UNSPEC
;
154 send(rtnl_sock
.fd
, &req
, req
.nl
.nlmsg_len
, 0);
158 void rtnl_route_set(struct relayd_host
*host
, bool add
)
160 struct relayd_interface
*rif
;
162 list_for_each_entry(rif
, &interfaces
, list
) {
163 if (rif
== host
->rif
)
166 rtnl_route_request(rif
, host
, add
);
170 void relayd_add_interface_routes(struct relayd_interface
*rif
)
172 rif
->rt_table
= route_table
++;
173 rtnl_rule_request(rif
, true);
176 void relayd_del_interface_routes(struct relayd_interface
*rif
)
178 rtnl_rule_request(rif
, false);
183 ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
186 static void rtnl_parse_newneigh(struct nlmsghdr
*h
)
188 struct relayd_interface
*rif
= NULL
;
189 struct ndmsg
*r
= NLMSG_DATA(h
);
190 const uint8_t *lladdr
= NULL
;
191 const uint8_t *ipaddr
= NULL
;
195 if (r
->ndm_family
!= AF_INET
)
198 list_for_each_entry(rif
, &interfaces
, list
) {
199 if (rif
->sll
.sll_ifindex
== r
->ndm_ifindex
)
200 goto found_interface
;
205 len
= h
->nlmsg_len
- NLMSG_LENGTH(sizeof(*r
));
206 for (rta
= NDA_RTA(r
); RTA_OK(rta
, len
); rta
= RTA_NEXT(rta
, len
)) {
207 switch(rta
->rta_type
) {
209 lladdr
= RTA_DATA(rta
);
212 ipaddr
= RTA_DATA(rta
);
219 if (!lladdr
|| !ipaddr
|| (r
->ndm_state
& (NUD_INCOMPLETE
|NUD_FAILED
)))
222 if (!memcmp(lladdr
, "\x00\x00\x00\x00\x00\x00", ETH_ALEN
))
225 DPRINTF(1, "%s: Found ARP cache entry for host "IP_FMT
" ("MAC_FMT
")\n",
226 rif
->ifname
, IP_BUF(ipaddr
), MAC_BUF(lladdr
));
227 relayd_refresh_host(rif
, lladdr
, ipaddr
);
230 static void rtnl_parse_packet(void *data
, int len
)
234 for (h
= data
; NLMSG_OK(h
, len
); h
= NLMSG_NEXT(h
, len
)) {
235 if (h
->nlmsg_type
== NLMSG_DONE
||
236 h
->nlmsg_type
== NLMSG_ERROR
)
239 if (h
->nlmsg_seq
!= rtnl_dump_seq
)
242 if (h
->nlmsg_type
== RTM_NEWNEIGH
)
243 rtnl_parse_newneigh(h
);
247 static void rtnl_cb(struct uloop_fd
*fd
, unsigned int events
)
249 struct sockaddr_nl nladdr
;
250 static uint8_t buf
[16384];
253 .iov_len
= sizeof(buf
),
255 struct msghdr msg
= {
257 .msg_namelen
= sizeof(nladdr
),
265 len
= recvmsg(rtnl_sock
.fd
, &msg
, 0);
276 if (nladdr
.nl_pid
!= 0)
279 rtnl_parse_packet(buf
, len
);
283 int relayd_rtnl_init(void)
285 struct sockaddr_nl snl_local
;
291 .nlmsg_len
= sizeof(req
),
292 .nlmsg_type
= RTM_GETNEIGH
,
293 .nlmsg_flags
= NLM_F_ROOT
|NLM_F_MATCH
|NLM_F_REQUEST
,
296 .g
.rtgen_family
= AF_INET
,
299 rtnl_sock
.fd
= socket(AF_NETLINK
, SOCK_RAW
, NETLINK_ROUTE
);
300 if (rtnl_sock
.fd
< 0) {
301 perror("socket(AF_NETLINK)");
305 snl_local
.nl_family
= AF_NETLINK
;
307 if (bind(rtnl_sock
.fd
, (struct sockaddr
*) &snl_local
, sizeof(struct sockaddr_nl
)) < 0) {
313 rtnl_sock
.cb
= rtnl_cb
;
314 uloop_fd_add(&rtnl_sock
, ULOOP_READ
| ULOOP_EDGE_TRIGGER
);
316 rtnl_seq
= time(NULL
);
317 rtnl_dump_seq
= rtnl_seq
;
318 req
.nlh
.nlmsg_seq
= rtnl_seq
;
319 send(rtnl_sock
.fd
, &req
, sizeof(req
), 0);
324 void relayd_rtnl_done(void)
326 uloop_fd_delete(&rtnl_sock
);