X-Git-Url: https://git.decadent.org.uk/gitweb/?p=odhcp6c.git;a=blobdiff_plain;f=src%2Fra.c;h=5809fcd2c1060c69dfcb1248b270b83f8fd0f74b;hp=b21bc5615e5acb65ea1938e742437a80bac22f98;hb=b5afadae8ed69c98f4e9e6a33dfaf570c5bd9b51;hpb=46ba6f6aeb8055e872c57dc2b90a383fb280f440

diff --git a/src/ra.c b/src/ra.c
index b21bc56..5809fcd 100644
--- a/src/ra.c
+++ b/src/ra.c
@@ -13,7 +13,6 @@
  */
 
 #include <fcntl.h>
-#include <ifaddrs.h>
 #include <stdio.h>
 #include <signal.h>
 #include <string.h>
@@ -161,19 +160,8 @@ static void ra_send_rs(int signal __attribute__((unused)))
 static int16_t pref_to_priority(uint8_t flags)
 {
 	flags = (flags >> 3) & 0x03;
-	return (flags == 0x0) ? 1024 : (flags == 0x1) ? 512 :
-			(flags == 0x3) ? 2048 : -1;
-}
-
-
-static void update_proc(const char *sect, const char *opt, uint32_t value)
-{
-	char buf[64];
-	snprintf(buf, sizeof(buf), "/proc/sys/net/ipv6/%s/%s/%s", sect, if_name, opt);
-
-	int fd = open(buf, O_WRONLY);
-	write(fd, buf, snprintf(buf, sizeof(buf), "%u", value));
-	close(fd);
+	return (flags == 0x0) ? 512 : (flags == 0x1) ? 384 :
+			(flags == 0x3) ? 640 : -1;
 }
 
 
@@ -248,54 +236,77 @@ static bool ra_icmpv6_valid(struct sockaddr_in6 *source, int hlim, uint8_t *data
 	return opt == end;
 }
 
+int ra_conf_hoplimit(int newvalue)
+{
+	static int value = 0;
+	if (newvalue > 0)
+		value = newvalue;
+	return value;
+}
+
+int ra_conf_mtu(int newvalue)
+{
+	static int value = 0;
+	if (newvalue >= 1280 && newvalue <= 65535)
+		value = newvalue;
+	return value;
+}
+
+int ra_conf_reachable(int newvalue)
+{
+	static int value = 0;
+	if (newvalue > 0 && newvalue <= 3600000)
+		value = newvalue;
+	return value;
+}
+
+int ra_conf_retransmit(int newvalue)
+{
+	static int value = 0;
+	if (newvalue > 0 && newvalue <= 60000)
+		value = newvalue;
+	return value;
+}
+
 bool ra_process(void)
 {
 	bool found = false;
 	bool changed = false;
-	bool has_lladdr = !IN6_IS_ADDR_UNSPECIFIED(&lladdr);
 	uint8_t buf[1500], cmsg_buf[128];
 	struct nd_router_advert *adv = (struct nd_router_advert*)buf;
-	struct odhcp6c_entry entry = {IN6ADDR_ANY_INIT, 0, 0, IN6ADDR_ANY_INIT, 0, 0, 0, 0, 0, 0};
+	struct odhcp6c_entry entry = {IN6ADDR_ANY_INIT, 0, 0, IN6ADDR_ANY_INIT, 0, 0, 0, 0, 0};
 	const struct in6_addr any = IN6ADDR_ANY_INIT;
 
-	if (!has_lladdr) {
-		// Autodetect interface-id if not specified
-		struct ifaddrs *ifaddr, *ifa;
-
-		if (getifaddrs(&ifaddr) == 0) {
-			for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
-				struct sockaddr_in6 *addr;
-
-				if (ifa->ifa_addr == NULL || ifa->ifa_addr->sa_family != AF_INET6)
-					continue;
-
-				addr = (struct sockaddr_in6*)ifa->ifa_addr;
+	if (IN6_IS_ADDR_UNSPECIFIED(&lladdr)) {
+		struct sockaddr_in6 addr = {AF_INET6, 0, 0, ALL_IPV6_ROUTERS, if_index};
+		socklen_t alen = sizeof(addr);
+		int sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
 
-				if (!IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr))
-					continue;
-
-				if (!strcmp(ifa->ifa_name, if_name)) {
-					lladdr = addr->sin6_addr;
-					has_lladdr = true;
-					break;
-				}
-			}
+		if (!connect(sock, (struct sockaddr*)&addr, sizeof(addr)) &&
+				!getsockname(sock, (struct sockaddr*)&addr, &alen))
+			lladdr = addr.sin6_addr;
 
-			freeifaddrs(ifaddr);
-		}
+		close(sock);
 	}
 
 	while (true) {
 		struct sockaddr_in6 from;
 		struct iovec iov = {buf, sizeof(buf)};
-		struct msghdr msg = {&from, sizeof(from), &iov, 1,
-				cmsg_buf, sizeof(cmsg_buf), 0};
+		struct msghdr msg = {
+			.msg_name = (void *) &from,
+			.msg_namelen = sizeof(from),
+			.msg_iov = &iov,
+			.msg_iovlen = 1,
+			.msg_control = cmsg_buf,
+			.msg_controllen = sizeof(cmsg_buf),
+			.msg_flags = 0
+		};
 
 		ssize_t len = recvmsg(sock, &msg, MSG_DONTWAIT);
 		if (len <= 0)
 			break;
 
-		if (!has_lladdr)
+		if (IN6_IS_ADDR_UNSPECIFIED(&lladdr))
 			continue;
 
 		int hlim = 0;
@@ -332,26 +343,18 @@ bool ra_process(void)
 		changed |= odhcp6c_update_entry(STATE_RA_ROUTE, &entry, 0, true);
 
 		// Parse hoplimit
-		if (adv->nd_ra_curhoplimit)
-			update_proc("conf", "hop_limit", adv->nd_ra_curhoplimit);
+		ra_conf_hoplimit(adv->nd_ra_curhoplimit);
 
 		// Parse ND parameters
-		uint32_t reachable = ntohl(adv->nd_ra_reachable);
-		if (reachable > 0 && reachable <= 3600000)
-			update_proc("neigh", "base_reachable_time_ms", reachable);
-
-		uint32_t retransmit = ntohl(adv->nd_ra_retransmit);
-		if (retransmit > 0 && retransmit <= 60000)
-			update_proc("neigh", "retrans_time_ms", retransmit);
-
+		ra_conf_reachable(ntohl(adv->nd_ra_reachable));
+		ra_conf_retransmit(ntohl(adv->nd_ra_retransmit));
 
 		// Evaluate options
 		struct icmpv6_opt *opt;
 		icmpv6_for_each_option(opt, &adv[1], &buf[len]) {
 			if (opt->type == ND_OPT_MTU) {
 				uint32_t *mtu = (uint32_t*)&opt->data[2];
-				if (ntohl(*mtu) >= 1280 && ntohl(*mtu) <= 65535)
-					update_proc("conf", "mtu", ntohl(*mtu));
+				ra_conf_mtu(ntohl(*mtu));
 			} else if (opt->type == ND_OPT_ROUTE_INFORMATION && opt->len <= 3) {
 				entry.router = from.sin6_addr;
 				entry.target = any;