ipoe: add support for peer-to-peer client interfaces

accel-pppd/ctrl/ipoe/ipoe.c

@@ -156,6 +156,7 @@ static int conf_proto;
 static LIST_HEAD(conf_offer_delay);
 static const char *conf_vlan_name;
 static int conf_ip_unnumbered;
+static int conf_ip_unnumbered_peer_mode;
 static int conf_check_mac_change;
 static int conf_soft_terminate;
 static int conf_calling_sid = SID_MAC;
@@ -888,11 +889,15 @@ static void __ipoe_session_activate(struct ipoe_session *ses)
 
 	if (ses->ifindex == -1) {
 		if (serv->opt_ifcfg)
-			ipaddr_add(serv->ifindex, ses->router, conf_ip_unnumbered ? 32 : ses->mask);
+			if(conf_ip_unnumbered && conf_ip_unnumbered_peer_mode) {
+				ipaddr_add_peer(serv->ifindex, ses->router, 32, ses->yiaddr);
+			} else {
+				ipaddr_add(serv->ifindex, ses->router, conf_ip_unnumbered ? 32 : ses->mask);
+			}
 		else if (!conf_ip_unnumbered)
 			iproute_add(serv->ifindex, ses->router, ses->yiaddr, 0, conf_proto, ses->mask);
 
-		if (conf_ip_unnumbered)
+		if (conf_ip_unnumbered && !conf_ip_unnumbered_peer_mode)
 			iproute_add(serv->ifindex, serv->opt_src ?: ses->router, ses->yiaddr, 0, conf_proto, 32);
 	} else
 		ses->ctrl.dont_ifcfg = 0;
@@ -3478,6 +3483,12 @@ static void load_config(void)
 	else
 		conf_ip_unnumbered = 1;
 
+	opt = conf_get_opt("ipoe", "ip-unnumbered-peer-mode");
+	if (opt)
+		conf_ip_unnumbered_peer_mode = atoi(opt);
+	else
+		conf_ip_unnumbered_peer_mode = 0;
+
 	opt = conf_get_opt("ipoe", "idle-timeout");
 	if (opt)
 		conf_idle_timeout = atoi(opt);

accel-pppd/libnetlink/iputils.c

@@ -329,6 +329,39 @@ int __export ipaddr_add(int ifindex, in_addr_t addr, int mask)
 	return r;
 }
 
+int __export ipaddr_add_peer(int ifindex, in_addr_t addr, int mask, in_addr_t peer_addr)
+{
+	struct ipaddr_req {
+		struct nlmsghdr n;
+		struct ifaddrmsg i;
+		char buf[4096];
+	} req;
+	struct rtnl_handle *rth = net->rtnl_get();
+	int r = 0;
+
+	if (!rth)
+		return -1;
+
+	memset(&req, 0, sizeof(req) - 4096);
+
+	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg));
+	req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE;
+	req.n.nlmsg_type = RTM_NEWADDR;
+	req.i.ifa_family = AF_INET;
+	req.i.ifa_index = ifindex;
+	req.i.ifa_prefixlen = mask;
+
+	addattr32(&req.n, sizeof(req), IFA_LOCAL, addr);
+	addattr32(&req.n, sizeof(req), IFA_ADDRESS, peer_addr);
+
+	if (rtnl_talk(rth, &req.n, 0, 0, NULL, NULL, NULL, 0) < 0)
+		r = -1;
+
+	net->rtnl_put(rth);
+
+	return r;
+}
+
 int __export ipaddr_del(int ifindex, in_addr_t addr, int mask)
 {
 	struct ipaddr_req {

accel-pppd/libnetlink/iputils.h

@@ -13,6 +13,7 @@ int iplink_vlan_del(int ifindex);
 int iplink_vlan_get_vid(int ifindex, int *iflink);
 
 int ipaddr_add(int ifindex, in_addr_t addr, int mask);
+int ipaddr_add_peer(int ifindex, in_addr_t addr, int mask, in_addr_t peer_addr);
 int ipaddr_del(int ifindex, in_addr_t addr, int mask);
 
 int iproute_add(int ifindex, in_addr_t src, in_addr_t dst, in_addr_t gw, int proto, int mask);