X-Git-Url: http://git.archive.openwrt.org/?p=project%2Frelayd.git;a=blobdiff_plain;f=route.c;h=6124a7e7709b13345f89e45ae4fcc287130ecd57;hp=5425d5192ee78bdd7dbd8c052e30b4f0e4c7b2f2;hb=71986c610ae62e39fd8cffff264c3ac403723ae4;hpb=6a7581ccbdbc468a6362f100a9393203fedc4700

diff --git a/route.c b/route.c
index 5425d51..6124a7e 100644
--- a/route.c
+++ b/route.c
@@ -22,10 +22,13 @@
 #include <unistd.h>
 #include <fcntl.h>
 
+#include <linux/fib_rules.h>
+
 #include "relayd.h"
 
 static struct uloop_fd rtnl_sock;
 static unsigned int rtnl_seq, rtnl_dump_seq;
+int route_table = 16800;
 
 static void rtnl_flush(void)
 {
@@ -39,61 +42,184 @@ static void rtnl_flush(void)
 	close(fd);
 }
 
-static void rtnl_route_set(struct relayd_host *host, bool add)
+static void
+rtnl_rule_request(struct relayd_interface *rif, bool add, bool defgw_workaround)
 {
 	static struct {
 		struct nlmsghdr nl;
 		struct rtmsg rt;
 		struct {
 			struct rtattr rta;
-			uint8_t ipaddr[4];
-		} __packed dst;
+			int table;
+		} __packed table;
 		struct {
 			struct rtattr rta;
-			int ifindex;
+			char ifname[IFNAMSIZ + 1];
 		} __packed dev;
-	} __packed req;
+	} __packed req = {
+		.rt = {
+			.rtm_family = AF_INET,
+			.rtm_table = RT_TABLE_UNSPEC,
+			.rtm_scope = RT_SCOPE_UNIVERSE,
+			.rtm_protocol = RTPROT_BOOT,
+		},
+		.table.rta = {
+			.rta_type = FRA_TABLE,
+			.rta_len = sizeof(req.table),
+		},
+	};
 
-	memset(&req, 0, sizeof(req));
+	int padding = sizeof(req.dev.ifname);
 
-	req.nl.nlmsg_len = sizeof(req);
-	req.rt.rtm_family = AF_INET;
-	req.rt.rtm_dst_len = 32;
+	if (!defgw_workaround) {
+		req.dev.rta.rta_type = FRA_IFNAME;
+		padding -= strlen(rif->ifname) + 1;
+		strcpy(req.dev.ifname, rif->ifname);
+		req.dev.rta.rta_len = sizeof(req.dev.rta) + strlen(rif->ifname) + 1;
+	} else {
+		req.dev.rta.rta_type = FRA_PRIORITY;
+		req.dev.rta.rta_len = sizeof(req.dev.rta) + sizeof(uint32_t);
+		padding -= sizeof(uint32_t);
+		*((uint32_t *) &req.dev.ifname) = 1;
+	}
+	req.table.table = rif->rt_table;
+	req.nl.nlmsg_len = sizeof(req) - padding;
 
-	req.dst.rta.rta_type = RTA_DST;
-	req.dst.rta.rta_len = sizeof(req.dst);
-	memcpy(req.dst.ipaddr, host->ipaddr, sizeof(req.dst.ipaddr));
+	req.nl.nlmsg_flags = NLM_F_REQUEST;
+	if (add) {
+		req.nl.nlmsg_type = RTM_NEWRULE;
+		req.nl.nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL;
+
+		req.rt.rtm_type = RTN_UNICAST;
+	} else {
+		req.nl.nlmsg_type = RTM_DELRULE;
+		req.rt.rtm_type = RTN_UNSPEC;
+	}
+
+	send(rtnl_sock.fd, &req, req.nl.nlmsg_len, 0);
+	rtnl_flush();
+}
+
+
+static void
+rtnl_route_request(struct relayd_interface *rif, struct relayd_host *host,
+		   struct relayd_route *route, bool add)
+{
+	static struct {
+		struct nlmsghdr nl;
+		struct rtmsg rt;
+		struct {
+			struct rtattr rta;
+			uint8_t ipaddr[4];
+		} __packed dst;
+		struct {
+			struct rtattr rta;
+			int table;
+		} __packed table;
+		struct {
+			struct rtattr rta;
+			int ifindex;
+		} __packed dev;
+		struct {
+			struct rtattr rta;
+			uint8_t ipaddr[4];
+		} __packed gw;
+	} __packed req = {
+		.rt = {
+			.rtm_family = AF_INET,
+			.rtm_dst_len = 32,
+			.rtm_table = RT_TABLE_MAIN,
+		},
+		.table.rta = {
+			.rta_type = RTA_TABLE,
+			.rta_len = sizeof(req.table),
+		},
+		.dst.rta = {
+			.rta_len = sizeof(req.dst),
+		},
+		.dev.rta = {
+			.rta_type = RTA_OIF,
+			.rta_len = sizeof(req.dev),
+		},
+		.gw.rta = {
+			.rta_type = RTA_GATEWAY,
+			.rta_len = sizeof(req.gw),
+		},
+	};
+	int pktlen = sizeof(req);
 
-	req.dev.rta.rta_type = RTA_OIF;
-	req.dev.rta.rta_len = sizeof(req.dev);
 	req.dev.ifindex = host->rif->sll.sll_ifindex;
+	req.table.table = rif->rt_table;
 
 	req.nl.nlmsg_flags = NLM_F_REQUEST;
-	req.rt.rtm_table = RT_TABLE_MAIN;
 	if (add) {
 		req.nl.nlmsg_type = RTM_NEWROUTE;
 		req.nl.nlmsg_flags |= NLM_F_CREATE | NLM_F_REPLACE;
 
 		req.rt.rtm_protocol = RTPROT_BOOT;
-		req.rt.rtm_scope = RT_SCOPE_LINK;
+		if (route) {
+			req.rt.rtm_scope = RT_SCOPE_UNIVERSE;
+		} else {
+			req.rt.rtm_scope = RT_SCOPE_LINK;
+		}
 		req.rt.rtm_type = RTN_UNICAST;
 	} else {
 		req.nl.nlmsg_type = RTM_DELROUTE;
 		req.rt.rtm_scope = RT_SCOPE_NOWHERE;
 	}
 
-	send(rtnl_sock.fd, &req, sizeof(req), 0);
+	req.dst.rta.rta_type = RTA_DST;
+	if (route) {
+		DPRINTF(2, "%s: add route to "IP_FMT"/%d via "IP_FMT"\n",
+			host->rif->ifname, IP_BUF(route->dest), route->mask, IP_BUF(host->ipaddr));
+		if (!route->mask) {
+			/* No DST -> reuse the DST attribute as the gateway attribute */
+			memcpy(req.dst.ipaddr, host->ipaddr, sizeof(req.dst.ipaddr));
+			req.dst.rta.rta_type = RTA_GATEWAY;
+			pktlen -= sizeof(req.gw);
+			req.rt.rtm_dst_len = 0;
+		} else {
+			memcpy(req.gw.ipaddr, host->ipaddr, sizeof(req.gw.ipaddr));
+			memcpy(req.dst.ipaddr, route->dest, sizeof(req.dst.ipaddr));
+			req.rt.rtm_dst_len = route->mask;
+		}
+	} else {
+		pktlen -= sizeof(req.gw);
+		req.rt.rtm_dst_len = 32;
+		memcpy(req.dst.ipaddr, host->ipaddr, sizeof(req.dst.ipaddr));
+	}
+
+	req.nl.nlmsg_len = pktlen;
+	if (route)
+		rtnl_rule_request(rif, true, true);
+	send(rtnl_sock.fd, &req, pktlen, 0);
+	if (route)
+		rtnl_rule_request(rif, false, true);
 	rtnl_flush();
 }
 
-void relayd_add_route(struct relayd_host *host)
+void
+rtnl_route_set(struct relayd_host *host, struct relayd_route *route, bool add)
+{
+	struct relayd_interface *rif;
+
+	list_for_each_entry(rif, &interfaces, list) {
+		if (rif == host->rif)
+			continue;
+
+		rtnl_route_request(rif, host, route, add);
+	}
+}
+
+void relayd_add_interface_routes(struct relayd_interface *rif)
 {
-	rtnl_route_set(host, true);
+	rif->rt_table = route_table++;
+	rtnl_rule_request(rif, true, false);
 }
 
-void relayd_del_route(struct relayd_host *host)
+void relayd_del_interface_routes(struct relayd_interface *rif)
 {
-	rtnl_route_set(host, false);
+	rtnl_rule_request(rif, false, false);
 }
 
 #ifndef NDA_RTA