From c5a1d00fc40a9c55024cfc7f92b0a455975ba503 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Wed, 26 Sep 2012 19:16:53 +0200
Subject: Keep track of interfaces

---
 ffd/ffd.c | 83 +++++++++++++++++++++++++++++++++++++++++++++------------------
 1 file changed, 60 insertions(+), 23 deletions(-)

(limited to 'ffd/ffd.c')

diff --git a/ffd/ffd.c b/ffd/ffd.c
index 27e5c29..e729a43 100644
--- a/ffd/ffd.c
+++ b/ffd/ffd.c
@@ -57,8 +57,10 @@ static unsigned mtu = 1528;
 static int sockfd;
 static struct timespec now;
 
+static ffd_iface_t *iface_list = NULL;
+
 static ffd_neigh_t self;
-static ffd_orig_t own_data;
+//static ffd_orig_t own_data;
 
 /* neighs and origs that have been changed must be moved to front */
 //static ffd_neigh_t *neigh_data = NULL;
@@ -92,12 +94,12 @@ static bool init_self() {
 		return false;
 
 	memset(&self, 0, sizeof(self));
-	memset(&own_data, 0, sizeof(own_data));
+	//memset(&own_data, 0, sizeof(own_data));
 
-	self.addr = own_data.addr = primary_addr;
+	//self.addr = own_data.addr = primary_addr;
 
-	random_bytes(&self.rev, sizeof(self.rev));
-	random_bytes(&own_data.rev, sizeof(own_data.rev));
+	//random_bytes(&self.rev, sizeof(self.rev));
+	//random_bytes(&own_data.rev, sizeof(own_data.rev));
 
 	return true;
 }
@@ -112,10 +114,11 @@ static bool init_socket() {
 	return true;
 }
 
-static void join_mcast(const char *ifname, unsigned ifindex, void *arg) {
+static void update_netif(const char *ifname, unsigned ifindex, void *arg) {
 	if (!use_netif(ifname))
 		return;
 
+	/* join multicast group */
 	struct packet_mreq mr;
 	memset(&mr, 0, sizeof(mr));
 	mr.mr_ifindex = ifindex;
@@ -124,6 +127,48 @@ static void join_mcast(const char *ifname, unsigned ifindex, void *arg) {
 	memcpy(mr.mr_address, ffd_addr.d, ETH_ALEN);
 	if (setsockopt(sockfd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mr, sizeof(mr)) && errno != EADDRINUSE)
 		fprintf(stderr, "warning: setsockopt: %m\n");
+
+	ffd_iface_t *iface;
+	for (iface = iface_list; iface; iface = iface->next) {
+		if (iface->ifindex == ifindex)
+			break;
+	}
+
+	if (!iface) {
+		/* new iface */
+		iface = malloc(sizeof(ffd_iface_t));
+		iface->next = iface_list;
+		iface_list = iface;
+
+		iface->seqno = 0;
+		iface->neighs = NULL;
+	}
+
+	iface->ifindex = ifindex;
+	strncpy(iface->name, ifname, IF_NAMESIZE);
+	iface->type = netif_get_type(ifname);
+}
+
+static void update_netifs() {
+	ffd_iface_t *iface, **cur;
+
+	for (iface = iface_list; iface; iface = iface->next)
+		iface->type = IF_UNSPEC;
+
+	netif_foreach(update_netif, NULL);
+
+	cur = &iface_list;
+	while (*cur) {
+		iface = *cur;
+
+		if (iface->type == IF_UNSPEC) {
+			*cur = iface->next;
+			free(iface);
+		}
+		else {
+			cur = &iface->next;
+		}
+	}
 }
 
 static bool send_eth(const eth_addr_t *addr, unsigned ifindex, void *buf, size_t len) {
@@ -158,21 +203,8 @@ static bool send_eth(const eth_addr_t *addr, unsigned ifindex, void *buf, size_t
 	return true;
 }
 
-static void send_hello(const char *ifname, unsigned ifindex, void *arg) {
-	if (!use_netif(ifname))
-		return;
-
-	ffd_packet_t *packet = arg;
-
-	if (!send_eth(&ffd_addr, ifindex, packet, sizeof(ffd_packet_t)+ntohs(packet->len)))
-		fprintf(stderr, "send_eth: %m\n");
-}
 
 static void send_hellos() {
-	/*if (!orig_data)
-	  return;*/
-	static uint16_t seqno = 0;
-
 	ffd_packet_t *packet = alloca(sizeof(ffd_packet_t)+PACKET_MAX);
 
 	packet->version_magic = htons(FFD_VERSION_MAGIC);
@@ -182,11 +214,16 @@ static void send_hellos() {
 	if (!hello)
 		return;
 
-	memset(hello, 0, sizeof(ffd_tlv_hello_t));
-	hello->seqno = htons(seqno++);
+	hello->reserved = 0;
 	hello->interval = htons(HELLO_INTERVAL*100);
 
-	netif_foreach(send_hello, packet);
+	ffd_iface_t *iface;
+	for (iface = iface_list; iface; iface = iface->next) {
+		hello->seqno = htons(iface->seqno++);
+
+		if (!send_eth(&ffd_addr, iface->ifindex, packet, sizeof(ffd_packet_t)+ntohs(packet->len)))
+			fprintf(stderr, "send_eth: %m\n");
+	}
 }
 
 static void receive_packet() {
@@ -219,7 +256,7 @@ int main() {
 	struct timespec next_hello = now;
 
 	while (true) {
-		netif_foreach(join_mcast, NULL);
+		update_netifs();
 
 		int timeout = timespec_diff(&next_hello, &now);
 
-- 
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