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);
46 rtnl_route_request(struct relayd_interface *rif, struct relayd_host *host,
47 struct relayd_route *route, bool add)
70 .rtm_family = AF_INET,
72 .rtm_table = RT_TABLE_MAIN,
75 .rta_type = RTA_TABLE,
76 .rta_len = sizeof(req.table),
79 .rta_len = sizeof(req.dst),
83 .rta_len = sizeof(req.dev),
86 .rta_type = RTA_GATEWAY,
87 .rta_len = sizeof(req.gw),
90 int pktlen = sizeof(req);
92 req.dev.ifindex = host->rif->sll.sll_ifindex;
93 req.table.table = rif->rt_table;
95 req.nl.nlmsg_flags = NLM_F_REQUEST;
97 req.nl.nlmsg_type = RTM_NEWROUTE;
98 req.nl.nlmsg_flags |= NLM_F_CREATE | NLM_F_REPLACE;
100 req.rt.rtm_protocol = RTPROT_BOOT;
102 req.rt.rtm_scope = RT_SCOPE_UNIVERSE;
104 req.rt.rtm_scope = RT_SCOPE_LINK;
106 req.rt.rtm_type = RTN_UNICAST;
108 req.nl.nlmsg_type = RTM_DELROUTE;
109 req.rt.rtm_scope = RT_SCOPE_NOWHERE;
112 req.dst.rta.rta_type = RTA_DST;
114 DPRINTF(2, "%s: add route to "IP_FMT"/%d via "IP_FMT"\n",
115 host->rif->ifname, IP_BUF(route->dest), route->mask, IP_BUF(host->ipaddr));
117 /* No DST -> reuse the DST attribute as the gateway attribute */
118 memcpy(req.dst.ipaddr, host->ipaddr, sizeof(req.dst.ipaddr));
119 req.dst.rta.rta_type = RTA_GATEWAY;
120 pktlen -= sizeof(req.gw);
121 req.rt.rtm_dst_len = 0;
123 memcpy(req.gw.ipaddr, host->ipaddr, sizeof(req.gw.ipaddr));
124 memcpy(req.dst.ipaddr, route->dest, sizeof(req.dst.ipaddr));
125 req.rt.rtm_dst_len = route->mask;
128 pktlen -= sizeof(req.gw);
129 req.rt.rtm_dst_len = 32;
130 memcpy(req.dst.ipaddr, host->ipaddr, sizeof(req.dst.ipaddr));
133 req.nl.nlmsg_len = pktlen;
134 send(rtnl_sock.fd, &req, pktlen, 0);
138 static void rtnl_rule_request(struct relayd_interface *rif, bool add)
149 char ifname[IFNAMSIZ + 1];
153 .rtm_family = AF_INET,
154 .rtm_table = RT_TABLE_UNSPEC,
155 .rtm_scope = RT_SCOPE_UNIVERSE,
156 .rtm_protocol = RTPROT_BOOT,
159 .rta_type = FRA_TABLE,
160 .rta_len = sizeof(req.table),
163 .rta_type = FRA_IFNAME,
167 int padding = sizeof(req.dev.ifname);
168 padding -= strlen(rif->ifname) + 1;
170 strcpy(req.dev.ifname, rif->ifname);
171 req.dev.rta.rta_len = sizeof(req.dev.rta) + strlen(rif->ifname) + 1;
172 req.table.table = rif->rt_table;
173 req.nl.nlmsg_len = sizeof(req) - padding;
175 req.nl.nlmsg_flags = NLM_F_REQUEST;
177 req.nl.nlmsg_type = RTM_NEWRULE;
178 req.nl.nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL;
180 req.rt.rtm_type = RTN_UNICAST;
182 req.nl.nlmsg_type = RTM_DELRULE;
183 req.rt.rtm_type = RTN_UNSPEC;
186 send(rtnl_sock.fd, &req, req.nl.nlmsg_len, 0);
191 rtnl_route_set(struct relayd_host *host, struct relayd_route *route, bool add)
193 struct relayd_interface *rif;
195 list_for_each_entry(rif, &interfaces, list) {
196 if (rif == host->rif)
199 rtnl_route_request(rif, host, route, add);
203 void relayd_add_interface_routes(struct relayd_interface *rif)
205 rif->rt_table = route_table++;
206 rtnl_rule_request(rif, true);
209 void relayd_del_interface_routes(struct relayd_interface *rif)
211 rtnl_rule_request(rif, false);
216 ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
219 static void rtnl_parse_newneigh(struct nlmsghdr *h)
221 struct relayd_interface *rif = NULL;
222 struct ndmsg *r = NLMSG_DATA(h);
223 const uint8_t *lladdr = NULL;
224 const uint8_t *ipaddr = NULL;
228 if (r->ndm_family != AF_INET)
231 list_for_each_entry(rif, &interfaces, list) {
232 if (rif->sll.sll_ifindex == r->ndm_ifindex)
233 goto found_interface;
238 len = h->nlmsg_len - NLMSG_LENGTH(sizeof(*r));
239 for (rta = NDA_RTA(r); RTA_OK(rta, len); rta = RTA_NEXT(rta, len)) {
240 switch(rta->rta_type) {
242 lladdr = RTA_DATA(rta);
245 ipaddr = RTA_DATA(rta);
252 if (!lladdr || !ipaddr || (r->ndm_state & (NUD_INCOMPLETE|NUD_FAILED)))
255 if (!memcmp(lladdr, "\x00\x00\x00\x00\x00\x00", ETH_ALEN))
258 DPRINTF(1, "%s: Found ARP cache entry for host "IP_FMT" ("MAC_FMT")\n",
259 rif->ifname, IP_BUF(ipaddr), MAC_BUF(lladdr));
260 relayd_refresh_host(rif, lladdr, ipaddr);
263 static void rtnl_parse_packet(void *data, int len)
267 for (h = data; NLMSG_OK(h, len); h = NLMSG_NEXT(h, len)) {
268 if (h->nlmsg_type == NLMSG_DONE ||
269 h->nlmsg_type == NLMSG_ERROR)
272 if (h->nlmsg_seq != rtnl_dump_seq)
275 if (h->nlmsg_type == RTM_NEWNEIGH)
276 rtnl_parse_newneigh(h);
280 static void rtnl_cb(struct uloop_fd *fd, unsigned int events)
282 struct sockaddr_nl nladdr;
283 static uint8_t buf[16384];
286 .iov_len = sizeof(buf),
288 struct msghdr msg = {
290 .msg_namelen = sizeof(nladdr),
298 len = recvmsg(rtnl_sock.fd, &msg, 0);
309 if (nladdr.nl_pid != 0)
312 rtnl_parse_packet(buf, len);
316 int relayd_rtnl_init(void)
318 struct sockaddr_nl snl_local;
324 .nlmsg_len = sizeof(req),
325 .nlmsg_type = RTM_GETNEIGH,
326 .nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST,
329 .g.rtgen_family = AF_INET,
332 rtnl_sock.fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
333 if (rtnl_sock.fd < 0) {
334 perror("socket(AF_NETLINK)");
338 snl_local.nl_family = AF_NETLINK;
340 if (bind(rtnl_sock.fd, (struct sockaddr *) &snl_local, sizeof(struct sockaddr_nl)) < 0) {
346 rtnl_sock.cb = rtnl_cb;
347 uloop_fd_add(&rtnl_sock, ULOOP_READ | ULOOP_EDGE_TRIGGER);
349 rtnl_seq = time(NULL);
350 rtnl_dump_seq = rtnl_seq;
351 req.nlh.nlmsg_seq = rtnl_seq;
352 send(rtnl_sock.fd, &req, sizeof(req), 0);
357 void relayd_rtnl_done(void)
359 uloop_fd_delete(&rtnl_sock);