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 RULE_F_ADD = (1 << 0),
47 RULE_F_DEFGW_WORKAROUND = (1 << 1),
51 rtnl_rule_request(struct relayd_interface *rif, int flags)
62 char ifname[IFNAMSIZ + 1];
66 .rtm_family = AF_INET,
67 .rtm_table = RT_TABLE_UNSPEC,
68 .rtm_scope = RT_SCOPE_UNIVERSE,
69 .rtm_protocol = RTPROT_BOOT,
72 .rta_type = FRA_TABLE,
73 .rta_len = sizeof(req.table),
77 int padding = sizeof(req.dev.ifname);
79 if (!(flags & RULE_F_DEFGW_WORKAROUND)) {
80 req.dev.rta.rta_type = FRA_IFNAME;
81 padding -= strlen(rif->ifname) + 1;
82 strcpy(req.dev.ifname, rif->ifname);
83 req.dev.rta.rta_len = sizeof(req.dev.rta) + strlen(rif->ifname) + 1;
85 req.dev.rta.rta_type = FRA_PRIORITY;
86 req.dev.rta.rta_len = sizeof(req.dev.rta) + sizeof(uint32_t);
87 padding -= sizeof(uint32_t);
88 *((uint32_t *) &req.dev.ifname) = 1;
90 req.table.table = rif->rt_table;
91 req.nl.nlmsg_len = sizeof(req) - padding;
93 req.nl.nlmsg_flags = NLM_F_REQUEST;
94 if (flags & RULE_F_ADD) {
95 req.nl.nlmsg_type = RTM_NEWRULE;
96 req.nl.nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL;
98 req.rt.rtm_type = RTN_UNICAST;
100 req.nl.nlmsg_type = RTM_DELRULE;
101 req.rt.rtm_type = RTN_UNSPEC;
104 send(rtnl_sock.fd, &req, req.nl.nlmsg_len, 0);
110 rtnl_route_request(struct relayd_interface *rif, struct relayd_host *host,
111 struct relayd_route *route, bool add)
134 .rtm_family = AF_INET,
136 .rtm_table = RT_TABLE_MAIN,
139 .rta_type = RTA_TABLE,
140 .rta_len = sizeof(req.table),
143 .rta_len = sizeof(req.dst),
147 .rta_len = sizeof(req.dev),
150 .rta_type = RTA_GATEWAY,
151 .rta_len = sizeof(req.gw),
154 int pktlen = sizeof(req);
156 req.dev.ifindex = host->rif->sll.sll_ifindex;
157 req.table.table = rif->rt_table;
159 req.nl.nlmsg_flags = NLM_F_REQUEST;
161 req.nl.nlmsg_type = RTM_NEWROUTE;
162 req.nl.nlmsg_flags |= NLM_F_CREATE | NLM_F_REPLACE;
164 req.rt.rtm_protocol = RTPROT_BOOT;
166 req.rt.rtm_scope = RT_SCOPE_UNIVERSE;
168 req.rt.rtm_scope = RT_SCOPE_LINK;
170 req.rt.rtm_type = RTN_UNICAST;
172 req.nl.nlmsg_type = RTM_DELROUTE;
173 req.rt.rtm_scope = RT_SCOPE_NOWHERE;
176 req.dst.rta.rta_type = RTA_DST;
178 DPRINTF(2, "%s: add route to "IP_FMT"/%d via "IP_FMT"\n",
179 host->rif->ifname, IP_BUF(route->dest), route->mask, IP_BUF(host->ipaddr));
181 /* No DST -> reuse the DST attribute as the gateway attribute */
182 memcpy(req.dst.ipaddr, host->ipaddr, sizeof(req.dst.ipaddr));
183 req.dst.rta.rta_type = RTA_GATEWAY;
184 pktlen -= sizeof(req.gw);
185 req.rt.rtm_dst_len = 0;
187 memcpy(req.gw.ipaddr, host->ipaddr, sizeof(req.gw.ipaddr));
188 memcpy(req.dst.ipaddr, route->dest, sizeof(req.dst.ipaddr));
189 req.rt.rtm_dst_len = route->mask;
192 pktlen -= sizeof(req.gw);
193 req.rt.rtm_dst_len = 32;
194 memcpy(req.dst.ipaddr, host->ipaddr, sizeof(req.dst.ipaddr));
197 req.nl.nlmsg_len = pktlen;
199 rtnl_rule_request(rif, RULE_F_DEFGW_WORKAROUND | RULE_F_ADD);
200 send(rtnl_sock.fd, &req, pktlen, 0);
202 rtnl_rule_request(rif, RULE_F_DEFGW_WORKAROUND);
207 rtnl_route_set(struct relayd_host *host, struct relayd_route *route, bool add)
209 struct relayd_interface *rif;
211 list_for_each_entry(rif, &interfaces, list) {
212 if (rif == host->rif)
215 rtnl_route_request(rif, host, route, add);
219 void relayd_add_interface_routes(struct relayd_interface *rif)
221 rif->rt_table = route_table++;
222 rtnl_rule_request(rif, RULE_F_ADD);
225 void relayd_del_interface_routes(struct relayd_interface *rif)
227 rtnl_rule_request(rif, 0);
232 ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
235 static void rtnl_parse_newneigh(struct nlmsghdr *h)
237 struct relayd_interface *rif = NULL;
238 struct ndmsg *r = NLMSG_DATA(h);
239 const uint8_t *lladdr = NULL;
240 const uint8_t *ipaddr = NULL;
244 if (r->ndm_family != AF_INET)
247 list_for_each_entry(rif, &interfaces, list) {
248 if (rif->sll.sll_ifindex == r->ndm_ifindex)
249 goto found_interface;
254 len = h->nlmsg_len - NLMSG_LENGTH(sizeof(*r));
255 for (rta = NDA_RTA(r); RTA_OK(rta, len); rta = RTA_NEXT(rta, len)) {
256 switch(rta->rta_type) {
258 lladdr = RTA_DATA(rta);
261 ipaddr = RTA_DATA(rta);
268 if (!lladdr || !ipaddr || (r->ndm_state & (NUD_INCOMPLETE|NUD_FAILED)))
271 if (!memcmp(lladdr, "\x00\x00\x00\x00\x00\x00", ETH_ALEN))
274 DPRINTF(1, "%s: Found ARP cache entry for host "IP_FMT" ("MAC_FMT")\n",
275 rif->ifname, IP_BUF(ipaddr), MAC_BUF(lladdr));
276 relayd_refresh_host(rif, lladdr, ipaddr);
279 static void rtnl_parse_packet(void *data, int len)
283 for (h = data; NLMSG_OK(h, len); h = NLMSG_NEXT(h, len)) {
284 if (h->nlmsg_type == NLMSG_DONE ||
285 h->nlmsg_type == NLMSG_ERROR)
288 if (h->nlmsg_seq != rtnl_dump_seq)
291 if (h->nlmsg_type == RTM_NEWNEIGH)
292 rtnl_parse_newneigh(h);
296 static void rtnl_cb(struct uloop_fd *fd, unsigned int events)
298 struct sockaddr_nl nladdr;
299 static uint8_t buf[16384];
302 .iov_len = sizeof(buf),
304 struct msghdr msg = {
306 .msg_namelen = sizeof(nladdr),
314 len = recvmsg(rtnl_sock.fd, &msg, 0);
325 if (nladdr.nl_pid != 0)
328 rtnl_parse_packet(buf, len);
332 static void rtnl_dump_request(int nlmsg_type)
339 .nlmsg_len = sizeof(req),
340 .nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST,
343 .g.rtgen_family = AF_INET,
345 req.nlh.nlmsg_type = nlmsg_type;
346 req.nlh.nlmsg_seq = rtnl_seq;
347 send(rtnl_sock.fd, &req, sizeof(req), 0);
351 int relayd_rtnl_init(void)
353 struct sockaddr_nl snl_local;
355 rtnl_sock.fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
356 if (rtnl_sock.fd < 0) {
357 perror("socket(AF_NETLINK)");
361 snl_local.nl_family = AF_NETLINK;
363 if (bind(rtnl_sock.fd, (struct sockaddr *) &snl_local, sizeof(struct sockaddr_nl)) < 0) {
369 rtnl_sock.cb = rtnl_cb;
370 uloop_fd_add(&rtnl_sock, ULOOP_READ | ULOOP_EDGE_TRIGGER);
372 rtnl_seq = time(NULL);
373 rtnl_dump_seq = rtnl_seq;
374 rtnl_dump_request(RTM_GETNEIGH);
379 void relayd_rtnl_done(void)
381 uloop_fd_delete(&rtnl_sock);