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>
26 #include <linux/fib_rules.h>
30 static struct uloop_fd rtnl_sock;
31 static unsigned int rtnl_seq, rtnl_dump_seq;
32 int route_table = 16800;
34 static void rtnl_flush(void)
38 fd = open("/proc/sys/net/ipv4/route/flush", O_WRONLY);
47 RULE_F_ADD = (1 << 0),
48 RULE_F_DEFGW_WORKAROUND = (1 << 1),
51 static int get_route_table(struct relayd_interface *rif)
56 return local_route_table;
60 rtnl_rule_request(struct relayd_interface *rif, int flags)
75 char ifname[IFNAMSIZ + 1];
79 .rtm_family = AF_INET,
80 .rtm_table = RT_TABLE_UNSPEC,
81 .rtm_scope = RT_SCOPE_UNIVERSE,
82 .rtm_protocol = RTPROT_BOOT,
85 .rta.rta_type = FRA_PRIORITY,
86 .rta.rta_len = sizeof(req.prio),
90 .rta_type = FRA_TABLE,
91 .rta_len = sizeof(req.table),
94 const char *ifname = "lo";
95 int padding = sizeof(req.dev.ifname);
100 if (!(flags & RULE_F_DEFGW_WORKAROUND)) {
101 req.dev.rta.rta_type = FRA_IFNAME;
102 padding -= strlen(ifname) + 1;
103 strcpy(req.dev.ifname, ifname);
104 req.dev.rta.rta_len = sizeof(req.dev.rta) + strlen(ifname) + 1;
106 padding = sizeof(req.dev);
109 req.table.table = get_route_table(rif);
110 req.nl.nlmsg_len = sizeof(req) - padding;
112 req.nl.nlmsg_flags = NLM_F_REQUEST;
113 if (flags & RULE_F_ADD) {
114 req.nl.nlmsg_type = RTM_NEWRULE;
115 req.nl.nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL;
117 req.rt.rtm_type = RTN_UNICAST;
119 req.nl.nlmsg_type = RTM_DELRULE;
120 req.rt.rtm_type = RTN_UNSPEC;
123 send(rtnl_sock.fd, &req, req.nl.nlmsg_len, 0);
132 static struct rtnl_addr *
133 rtnl_add_addr(struct rtnl_addr *addr, int *len, int type, const uint8_t *ipaddr)
135 addr->rta.rta_type = type;
136 memcpy(addr->ipaddr, ipaddr, 4);
137 *len += sizeof(*addr);
142 rtnl_route_request(struct relayd_interface *rif, struct relayd_host *host,
143 struct relayd_route *route, bool add)
156 struct rtnl_addr addr[3];
159 .rtm_family = AF_INET,
161 .rtm_table = RT_TABLE_MAIN,
164 .rta_type = RTA_TABLE,
165 .rta_len = sizeof(req.table),
169 .rta_len = sizeof(req.dev),
171 .addr[0].rta.rta_len = sizeof(struct rtnl_addr),
172 .addr[1].rta.rta_len = sizeof(struct rtnl_addr),
173 .addr[2].rta.rta_len = sizeof(struct rtnl_addr),
175 int pktlen = sizeof(req) - sizeof(req.addr);
176 struct rtnl_addr *addr = &req.addr[0];
177 const char *ifname = "loopback";
179 req.dev.ifindex = host->rif->sll.sll_ifindex;
180 req.table.table = get_route_table(rif);
182 req.nl.nlmsg_flags = NLM_F_REQUEST;
184 req.nl.nlmsg_type = RTM_NEWROUTE;
185 req.nl.nlmsg_flags |= NLM_F_CREATE | NLM_F_REPLACE;
187 req.rt.rtm_protocol = RTPROT_BOOT;
189 req.rt.rtm_scope = RT_SCOPE_UNIVERSE;
191 req.rt.rtm_scope = RT_SCOPE_LINK;
193 req.rt.rtm_type = RTN_UNICAST;
195 req.nl.nlmsg_type = RTM_DELROUTE;
196 req.rt.rtm_scope = RT_SCOPE_NOWHERE;
200 ifname = rif->ifname;
203 DPRINTF(2, "%s: add route to "IP_FMT"/%d via "IP_FMT" (%s)\n", ifname,
204 IP_BUF(route->dest), route->mask, IP_BUF(host->ipaddr),
207 req.rt.rtm_dst_len = route->mask;
209 addr = rtnl_add_addr(addr, &pktlen, RTA_DST, route->dest);
210 addr = rtnl_add_addr(addr, &pktlen, RTA_GATEWAY, host->ipaddr);
212 DPRINTF(2, "%s: add host route to "IP_FMT" (%s)\n", ifname,
213 IP_BUF(host->ipaddr), host->rif->ifname);
214 addr = rtnl_add_addr(addr, &pktlen, RTA_DST, host->ipaddr);
215 req.rt.rtm_dst_len = 32;
220 addr = rtnl_add_addr(addr, &pktlen, RTA_PREFSRC, local_addr);
222 req.nl.nlmsg_len = pktlen;
224 rtnl_rule_request(rif, RULE_F_DEFGW_WORKAROUND | RULE_F_ADD);
225 send(rtnl_sock.fd, &req, pktlen, 0);
227 rtnl_rule_request(rif, RULE_F_DEFGW_WORKAROUND);
232 rtnl_route_set(struct relayd_host *host, struct relayd_route *route, bool add)
234 struct relayd_interface *rif;
236 list_for_each_entry(rif, &interfaces, list) {
237 if (rif == host->rif)
240 rtnl_route_request(rif, host, route, add);
242 if (local_route_table)
243 rtnl_route_request(NULL, host, route, add);
246 void relayd_add_interface_routes(struct relayd_interface *rif)
248 rif->rt_table = route_table++;
249 rtnl_rule_request(rif, RULE_F_ADD);
252 void relayd_del_interface_routes(struct relayd_interface *rif)
254 rtnl_rule_request(rif, 0);
259 ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
262 static void rtnl_parse_newneigh(struct nlmsghdr *h)
264 struct relayd_interface *rif = NULL;
265 struct ndmsg *r = NLMSG_DATA(h);
266 const uint8_t *lladdr = NULL;
267 const uint8_t *ipaddr = NULL;
271 if (r->ndm_family != AF_INET)
274 list_for_each_entry(rif, &interfaces, list) {
275 if (rif->sll.sll_ifindex == r->ndm_ifindex)
276 goto found_interface;
281 len = h->nlmsg_len - NLMSG_LENGTH(sizeof(*r));
282 for (rta = NDA_RTA(r); RTA_OK(rta, len); rta = RTA_NEXT(rta, len)) {
283 switch(rta->rta_type) {
285 lladdr = RTA_DATA(rta);
288 ipaddr = RTA_DATA(rta);
295 if (!lladdr || !ipaddr || (r->ndm_state & (NUD_INCOMPLETE|NUD_FAILED)))
298 if (!memcmp(lladdr, "\x00\x00\x00\x00\x00\x00", ETH_ALEN))
301 DPRINTF(1, "%s: Found ARP cache entry for host "IP_FMT" ("MAC_FMT")\n",
302 rif->ifname, IP_BUF(ipaddr), MAC_BUF(lladdr));
303 relayd_refresh_host(rif, lladdr, ipaddr);
306 static void rtnl_parse_packet(void *data, int len)
310 for (h = data; NLMSG_OK(h, len); h = NLMSG_NEXT(h, len)) {
311 if (h->nlmsg_type == NLMSG_DONE ||
312 h->nlmsg_type == NLMSG_ERROR)
315 if (h->nlmsg_seq != rtnl_dump_seq)
318 if (h->nlmsg_type == RTM_NEWNEIGH)
319 rtnl_parse_newneigh(h);
323 static void rtnl_cb(struct uloop_fd *fd, unsigned int events)
325 struct sockaddr_nl nladdr;
326 static uint8_t buf[16384];
329 .iov_len = sizeof(buf),
331 struct msghdr msg = {
333 .msg_namelen = sizeof(nladdr),
341 len = recvmsg(rtnl_sock.fd, &msg, 0);
352 if (nladdr.nl_pid != 0)
355 rtnl_parse_packet(buf, len);
359 static void rtnl_dump_request(int nlmsg_type)
366 .nlmsg_len = sizeof(req),
367 .nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST,
370 .g.rtgen_family = AF_INET,
372 req.nlh.nlmsg_type = nlmsg_type;
373 req.nlh.nlmsg_seq = rtnl_seq;
374 send(rtnl_sock.fd, &req, sizeof(req), 0);
378 int relayd_rtnl_init(void)
380 struct sockaddr_nl snl_local = {};
382 rtnl_sock.fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
383 if (rtnl_sock.fd < 0) {
384 perror("socket(AF_NETLINK)");
388 snl_local.nl_family = AF_NETLINK;
390 if (bind(rtnl_sock.fd, (struct sockaddr *) &snl_local, sizeof(struct sockaddr_nl)) < 0) {
396 rtnl_sock.cb = rtnl_cb;
397 uloop_fd_add(&rtnl_sock, ULOOP_READ | ULOOP_EDGE_TRIGGER);
399 rtnl_seq = time(NULL);
400 rtnl_dump_seq = rtnl_seq;
401 rtnl_dump_request(RTM_GETNEIGH);
402 rtnl_rule_request(NULL, RULE_F_ADD);
407 void relayd_rtnl_done(void)
409 rtnl_rule_request(NULL, 0);
410 uloop_fd_delete(&rtnl_sock);