X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fodhcpd.git;a=blobdiff_plain;f=src%2Fndp.c;h=d2fbe07fd515bb5bfd0846853eb06fc4afa5e4e7;hp=9fc539b4fea1bb089a82317d2defd582fec08748;hb=c5040fea540479b731b040986a9c3a62e34afc37;hpb=d2b74369ddd2eaeef7d36baed53f709c98c490b0

diff --git a/src/ndp.c b/src/ndp.c
index 9fc539b..d2fbe07 100644
--- a/src/ndp.c
+++ b/src/ndp.c
@@ -29,6 +29,7 @@
 #include <linux/rtnetlink.h>
 #include <linux/filter.h>
 #include "router.h"
+#include "dhcpv6.h"
 #include "ndp.h"
 
 
@@ -37,12 +38,11 @@ static void handle_solicit(void *addr, void *data, size_t len,
 		struct interface *iface, void *dest);
 static void handle_rtnetlink(void *addr, void *data, size_t len,
 		struct interface *iface, void *dest);
-static ssize_t ping6(struct in6_addr *addr,
-		const struct interface *iface);
+static void catch_rtnetlink(int error);
 
 static uint32_t rtnl_seqid = 0;
 static int ping_socket = -1;
-static struct odhcpd_event rtnl_event = {{.fd = -1}, handle_rtnetlink};
+static struct odhcpd_event rtnl_event = {{.fd = -1}, handle_rtnetlink, catch_rtnetlink};
 
 
 // Filter ICMPv6 messages of type neighbor soliciation
@@ -61,10 +61,15 @@ static const struct sock_fprog bpf_prog = {sizeof(bpf) / sizeof(*bpf), bpf};
 // Initialize NDP-proxy
 int init_ndp(void)
 {
+	int val = 256 * 1024;
+
 	// Setup netlink socket
 	if ((rtnl_event.uloop.fd = odhcpd_open_rtnl()) < 0)
 		return -1;
 
+	if (setsockopt(rtnl_event.uloop.fd, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val)))
+		setsockopt(rtnl_event.uloop.fd, SOL_SOCKET, SO_RCVBUFFORCE, &val, sizeof(val));
+
 	// Receive netlink neighbor and ip-address events
 	uint32_t group = RTNLGRP_IPV6_IFADDR;
 	setsockopt(rtnl_event.uloop.fd, SOL_NETLINK,
@@ -73,16 +78,6 @@ int init_ndp(void)
 	setsockopt(rtnl_event.uloop.fd, SOL_NETLINK,
 			NETLINK_ADD_MEMBERSHIP, &group, sizeof(group));
 
-	// Synthesize initial address events
-	struct {
-		struct nlmsghdr nh;
-		struct ifaddrmsg ifa;
-	} req2 = {
-		{sizeof(req2), RTM_GETADDR, NLM_F_REQUEST | NLM_F_DUMP,
-				++rtnl_seqid, 0},
-		{.ifa_family = AF_INET6}
-	};
-	send(rtnl_event.uloop.fd, &req2, sizeof(req2), MSG_DONTWAIT);
 	odhcpd_register(&rtnl_event);
 
 	// Open ICMPv6 socket
@@ -92,7 +87,7 @@ int init_ndp(void)
 			return -1;
 	}
 
-	int val = 2;
+	val = 2;
 	setsockopt(ping_socket, IPPROTO_RAW, IPV6_CHECKSUM, &val, sizeof(val));
 
 	// This is required by RFC 4861
@@ -125,6 +120,7 @@ static void dump_neigh_table(bool proxy)
 		{.ndm_family = AF_INET6, .ndm_flags = (proxy) ? NTF_PROXY : 0}
 	};
 	send(rtnl_event.uloop.fd, &req, sizeof(req), MSG_DONTWAIT);
+	odhcpd_process(&rtnl_event);
 }
 
 
@@ -135,17 +131,34 @@ int setup_ndp_interface(struct interface *iface, bool enable)
 	int procfd = open(procbuf, O_WRONLY);
 	bool dump_neigh = false;
 
-	if (iface->ndp_event.uloop.fd >= 0) {
+	if (iface->ndp_event.uloop.fd > 0) {
 		uloop_fd_delete(&iface->ndp_event.uloop);
 		close(iface->ndp_event.uloop.fd);
 		iface->ndp_event.uloop.fd = -1;
 
-		write(procfd, "0\n", 2);
+		if (!enable || iface->ndp != RELAYD_RELAY)
+			if (write(procfd, "0\n", 2) < 0) {}
+
 		dump_neigh = true;
 	}
 
+	if (enable && (iface->ra == RELAYD_SERVER ||
+			iface->dhcpv6 == RELAYD_SERVER || iface->ndp == RELAYD_RELAY)) {
+		// Synthesize initial address events
+		struct {
+			struct nlmsghdr nh;
+			struct ifaddrmsg ifa;
+		} req2 = {
+			{sizeof(req2), RTM_GETADDR, NLM_F_REQUEST | NLM_F_DUMP,
+					++rtnl_seqid, 0},
+			{.ifa_family = AF_INET6, .ifa_index = iface->ifindex}
+		};
+		send(rtnl_event.uloop.fd, &req2, sizeof(req2), MSG_DONTWAIT);
+	}
+
 	if (enable && iface->ndp == RELAYD_RELAY) {
-		write(procfd, "1\n", 2);
+		if (write(procfd, "1\n", 2) < 0) {}
+		close(procfd);
 
 		int sock = socket(AF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC, htons(ETH_P_IPV6));
 		if (sock < 0) {
@@ -188,8 +201,9 @@ int setup_ndp_interface(struct interface *iface, bool enable)
 			dump_neigh_table(false);
 		else
 			dump_neigh = false;
+	} else {
+		close(procfd);
 	}
-	close(procfd);
 
 	if (dump_neigh)
 		dump_neigh_table(true);
@@ -200,17 +214,16 @@ int setup_ndp_interface(struct interface *iface, bool enable)
 
 // Send an ICMP-ECHO. This is less for actually pinging but for the
 // neighbor cache to be kept up-to-date.
-static ssize_t ping6(struct in6_addr *addr,
+static void ping6(struct in6_addr *addr,
 		const struct interface *iface)
 {
-	struct sockaddr_in6 dest = {AF_INET6, 0, 0, *addr, 0};
+	struct sockaddr_in6 dest = {AF_INET6, 0, 0, *addr, iface->ifindex};
 	struct icmp6_hdr echo = {.icmp6_type = ICMP6_ECHO_REQUEST};
 	struct iovec iov = {&echo, sizeof(echo)};
 
-	// Linux seems to not honor IPV6_PKTINFO on raw-sockets, so work around
-	setsockopt(ping_socket, SOL_SOCKET, SO_BINDTODEVICE,
-			iface->ifname, sizeof(iface->ifname));
-	return odhcpd_send(ping_socket, &dest, &iov, 1, iface);
+	odhcpd_setup_route(addr, 128, iface, NULL, 128, true);
+	odhcpd_send(ping_socket, &dest, &iov, 1, iface);
+	odhcpd_setup_route(addr, 128, iface, NULL, 128, false);
 }
 
 
@@ -250,69 +263,74 @@ static void handle_solicit(void *addr, void *data, size_t len,
 	struct interface *c;
 	list_for_each_entry(c, &interfaces, head)
 		if (iface->ndp == RELAYD_RELAY && iface != c &&
-				(!ns_is_dad || !c->external == false))
+				(ns_is_dad || !c->external))
 			ping6(&req->nd_ns_target, c);
 }
 
-
-void odhcpd_setup_route(const struct in6_addr *addr, int prefixlen,
-		const struct interface *iface, const struct in6_addr *gw, bool add)
+// Use rtnetlink to modify kernel routes
+static void setup_route(struct in6_addr *addr, struct interface *iface, bool add)
 {
-	struct req {
-		struct nlmsghdr nh;
-		struct rtmsg rtm;
-		struct rtattr rta_dst;
-		struct in6_addr dst_addr;
-		struct rtattr rta_oif;
-		uint32_t ifindex;
-		struct rtattr rta_table;
-		uint32_t table;
-		struct rtattr rta_gw;
-		struct in6_addr gw;
-	} req = {
-		{sizeof(req), 0, NLM_F_REQUEST, ++rtnl_seqid, 0},
-		{AF_INET6, prefixlen, 0, 0, 0, 0, 0, 0, 0},
-		{sizeof(struct rtattr) + sizeof(struct in6_addr), RTA_DST},
-		*addr,
-		{sizeof(struct rtattr) + sizeof(uint32_t), RTA_OIF},
-		iface->ifindex,
-		{sizeof(struct rtattr) + sizeof(uint32_t), RTA_TABLE},
-		RT_TABLE_MAIN,
-		{sizeof(struct rtattr) + sizeof(struct in6_addr), RTA_GATEWAY},
-		IN6ADDR_ANY_INIT,
-	};
-
-	if (gw)
-		req.gw = *gw;
+	char namebuf[INET6_ADDRSTRLEN];
+	inet_ntop(AF_INET6, addr, namebuf, sizeof(namebuf));
+	syslog(LOG_NOTICE, "%s about %s on %s",
+			(add) ? "Learned" : "Forgot", namebuf, iface->ifname);
 
-	if (add) {
-		req.nh.nlmsg_type = RTM_NEWROUTE;
-		req.nh.nlmsg_flags |= (NLM_F_CREATE | NLM_F_REPLACE);
-		req.rtm.rtm_protocol = RTPROT_BOOT;
-		req.rtm.rtm_scope = (gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
-		req.rtm.rtm_type = RTN_UNICAST;
-	} else {
-		req.nh.nlmsg_type = RTM_DELROUTE;
-		req.rtm.rtm_scope = RT_SCOPE_NOWHERE;
-	}
+	if (iface->learn_routes)
+		odhcpd_setup_route(addr, 128, iface, NULL, 1024, add);
+}
 
-	size_t reqlen = (gw) ? sizeof(req) : offsetof(struct req, rta_gw);
-	send(rtnl_event.uloop.fd, &req, reqlen, MSG_DONTWAIT);
+// compare prefixes
+static int prefixcmp(const void *va, const void *vb)
+{
+	const struct odhcpd_ipaddr *a = va, *b = vb;
+	uint32_t a_pref = ((a->addr.s6_addr[0] & 0xfe) != 0xfc) ? a->preferred : 1;
+	uint32_t b_pref = ((b->addr.s6_addr[0] & 0xfe) != 0xfc) ? b->preferred : 1;
+	return (a_pref < b_pref) ? 1 : (a_pref > b_pref) ? -1 : 0;
 }
 
-// Use rtnetlink to modify kernel routes
-static void setup_route(struct in6_addr *addr, struct interface *iface,
-		bool add)
+// Check address update
+static void check_updates(struct interface *iface)
 {
-	char namebuf[INET6_ADDRSTRLEN];
-	inet_ntop(AF_INET6, addr, namebuf, sizeof(namebuf));
-	syslog(LOG_NOTICE, "%s about %s on %s", (add) ? "Learned" : "Forgot",
-			namebuf, (iface) ? iface->ifname : "<pending>");
+	struct odhcpd_ipaddr addr[RELAYD_MAX_ADDRS] = {{IN6ADDR_ANY_INIT, 0, 0, 0, 0}};
+	time_t now = odhcpd_time();
+	ssize_t len = odhcpd_get_interface_addresses(iface->ifindex, addr, ARRAY_SIZE(addr));
 
-	if (!iface || !iface->learn_routes)
+	if (len < 0)
 		return;
 
-	odhcpd_setup_route(addr, 128, iface, NULL, add);
+	qsort(addr, len, sizeof(*addr), prefixcmp);
+
+	for (int i = 0; i < len; ++i) {
+		addr[i].addr.s6_addr32[3] = 0;
+
+		if (addr[i].preferred < UINT32_MAX - now)
+			addr[i].preferred += now;
+
+		if (addr[i].valid < UINT32_MAX - now)
+			addr[i].valid += now;
+	}
+
+	bool change = len != (ssize_t)iface->ia_addr_len;
+	for (ssize_t i = 0; !change && i < len; ++i)
+		if (!IN6_ARE_ADDR_EQUAL(&addr[i].addr, &iface->ia_addr[i].addr) ||
+				(addr[i].preferred > 0) != (iface->ia_addr[i].preferred > 0) ||
+				addr[i].valid < iface->ia_addr[i].valid ||
+				addr[i].preferred < iface->ia_addr[i].preferred)
+			change = true;
+
+	if (change)
+		dhcpv6_ia_preupdate(iface);
+
+	memcpy(iface->ia_addr, addr, len * sizeof(*addr));
+	iface->ia_addr_len = len;
+
+	if (change)
+		dhcpv6_ia_postupdate(iface, now);
+
+	if (change) {
+		syslog(LOG_DEBUG, "Raising SIGUSR1 due to address change");
+		raise(SIGUSR1);
+	}
 }
 
 
@@ -326,43 +344,50 @@ static void handle_rtnetlink(_unused void *addr, void *data, size_t len,
 
 	for (struct nlmsghdr *nh = data; NLMSG_OK(nh, len);
 			nh = NLMSG_NEXT(nh, len)) {
+		struct ndmsg *ndm = NLMSG_DATA(nh);
 		struct rtmsg *rtm = NLMSG_DATA(nh);
-		if ((nh->nlmsg_type == RTM_NEWROUTE ||
-				nh->nlmsg_type == RTM_DELROUTE) &&
-				rtm->rtm_dst_len == 0)
-			raise(SIGUSR1); // Inform about a change in default route
 
-		struct ndmsg *ndm = NLMSG_DATA(nh);
-		struct ifaddrmsg *ifa = NLMSG_DATA(nh);
-		if (nh->nlmsg_type != RTM_NEWNEIGH
-				&& nh->nlmsg_type != RTM_DELNEIGH
-				&& nh->nlmsg_type != RTM_NEWADDR
-				&& nh->nlmsg_type != RTM_DELADDR)
-			continue; // Unrelated message type
 		bool is_addr = (nh->nlmsg_type == RTM_NEWADDR
 				|| nh->nlmsg_type == RTM_DELADDR);
+		bool is_route = (nh->nlmsg_type == RTM_NEWROUTE
+				|| nh->nlmsg_type == RTM_DELROUTE);
+		bool is_neigh = (nh->nlmsg_type == RTM_NEWNEIGH
+				|| nh->nlmsg_type == RTM_DELNEIGH);
 
 		// Family and ifindex are on the same offset for NEIGH and ADDR
-		if (NLMSG_PAYLOAD(nh, 0) < sizeof(*ndm)
+		if ((!is_addr && !is_route && !is_neigh)
+				|| NLMSG_PAYLOAD(nh, 0) < sizeof(*ndm)
 				|| ndm->ndm_family != AF_INET6)
-			continue; //
+			continue;
+
+		if (is_route) {
+			// Inform about a change in default route
+			if (rtm->rtm_dst_len == 0) {
+				syslog(LOG_DEBUG, "Raising SIGUSR1 due to default route change");
+				raise(SIGUSR1);
+			}
 
-		// Lookup interface
-		struct interface *iface;
-		if (!(iface = odhcpd_get_interface_by_index(ndm->ndm_ifindex)))
 			continue;
+		}
 
 		// Data to retrieve
-		size_t rta_offset = (is_addr) ? sizeof(*ifa) : sizeof(*ndm);
+		size_t rta_offset = (is_addr) ?	sizeof(struct ifaddrmsg) : sizeof(*ndm);
 		uint16_t atype = (is_addr) ? IFA_ADDRESS : NDA_DST;
 		ssize_t alen = NLMSG_PAYLOAD(nh, rta_offset);
 		struct in6_addr *addr = NULL;
 
 		for (struct rtattr *rta = (void*)(((uint8_t*)ndm) + rta_offset);
-				RTA_OK(rta, alen); rta = RTA_NEXT(rta, alen))
+				RTA_OK(rta, alen); rta = RTA_NEXT(rta, alen)) {
 			if (rta->rta_type == atype &&
-					RTA_PAYLOAD(rta) >= sizeof(*addr))
+					RTA_PAYLOAD(rta) >= sizeof(*addr)) {
 				addr = RTA_DATA(rta);
+			}
+		}
+
+		// Lookup interface
+		struct interface *iface = odhcpd_get_interface_by_index(ndm->ndm_ifindex);
+		if (!iface)
+			continue;
 
 		// Address not specified or unrelated
 		if (!addr || IN6_IS_ADDR_LINKLOCAL(addr) ||
@@ -398,6 +423,7 @@ static void handle_rtnetlink(_unused void *addr, void *data, size_t len,
 				if (nh->nlmsg_type == RTM_NEWNEIGH) {
 					req.ndm.ndm_ifindex = iface->ifindex;
 					send(rtnl_event.uloop.fd, &req, sizeof(req), MSG_DONTWAIT);
+					setup_route(addr, iface, false);
 					dump_neigh = true;
 				}
 			} else if (add) {
@@ -451,8 +477,7 @@ static void handle_rtnetlink(_unused void *addr, void *data, size_t len,
 		}
 
 		if (is_addr) {
-			if (iface->ra == RELAYD_SERVER)
-				raise(SIGUSR1); // Inform about a change in addresses
+			check_updates(iface);
 
 			if (iface->dhcpv6 == RELAYD_SERVER)
 				iface->ia_reconf = true;
@@ -467,7 +492,7 @@ static void handle_rtnetlink(_unused void *addr, void *data, size_t len,
 				struct interface *c;
 				list_for_each_entry(c, &interfaces, head) {
 					if (c->ndp == RELAYD_RELAY && !c->master) {
-						ifa->ifa_index = c->ifindex;
+						ndm->ndm_ifindex = c->ifindex;
 						send(rtnl_event.uloop.fd, nh, nh->nlmsg_len, MSG_DONTWAIT);
 					}
 				}
@@ -478,3 +503,18 @@ static void handle_rtnetlink(_unused void *addr, void *data, size_t len,
 	if (dump_neigh)
 		dump_neigh_table(false);
 }
+
+static void catch_rtnetlink(int error)
+{
+	if (error == ENOBUFS) {
+		struct {
+			struct nlmsghdr nh;
+			struct ifaddrmsg ifa;
+		} req2 = {
+			{sizeof(req2), RTM_GETADDR, NLM_F_REQUEST | NLM_F_DUMP,
+					++rtnl_seqid, 0},
+			{.ifa_family = AF_INET6}
+		};
+		send(rtnl_event.uloop.fd, &req2, sizeof(req2), MSG_DONTWAIT);
+	}
+}