libnetlink: add gateway and priority parameters to ip6route_*()

Let callers set a gateway and a priority to IPv6 routes. This is
necessary for implementing the RADIUS Framed-IPv6-Route attribute.

Also let ip6route_del() configure .rtm_protocol. This is already
implemented in ip6route_add(), so we need to add the ip6route_del()
counterpart. Otherwise, we couldn't delete routes that were added using
a non-zero protocol.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>

accel-pppd/ifcfg.c

@@ -222,7 +222,7 @@ void __export ap_session_ifdown(struct ap_session *ses)
 			if (!a->installed)
 				continue;
 			if (a->prefix_len > 64)
-				ip6route_del(ses->ifindex, &a->addr, a->prefix_len);
+				ip6route_del(ses->ifindex, &a->addr, a->prefix_len, NULL, 0, 0);
 			else {
 				struct in6_addr addr;
 				memcpy(addr.s6_addr, &a->addr, 8);

accel-pppd/ipv6/dhcpv6.c

@@ -156,7 +156,7 @@ static void ev_ses_finished(struct ap_session *ses)
 		if (pd->dp_active) {
 			struct ipv6db_addr_t *p;
 			list_for_each_entry(p, &ses->ipv6_dp->prefix_list, entry)
-				ip6route_del(0, &p->addr, p->prefix_len);
+				ip6route_del(0, &p->addr, p->prefix_len, NULL, 0, 0);
 		}
 
 		ipdb_put_ipv6_prefix(ses, ses->ipv6_dp);

accel-pppd/libnetlink/iputils.c

@@ -540,7 +540,7 @@ int __export iproute_del(int ifindex, in_addr_t dst, int proto, int mask, uint32
 	return r;
 }
 
-int __export ip6route_add(int ifindex, struct in6_addr *dst, int pref_len, int proto)
+int __export ip6route_add(int ifindex, const struct in6_addr *dst, int pref_len, const struct in6_addr *gw, int proto, uint32_t prio)
 {
 	struct ipaddr_req {
 		struct nlmsghdr n;
@@ -566,7 +566,12 @@ int __export ip6route_add(int ifindex, struct in6_addr *dst, int pref_len, int p
 	req.i.rtm_dst_len = pref_len;
 
 	addattr_l(&req.n, sizeof(req), RTA_DST, dst, sizeof(*dst));
-	addattr32(&req.n, sizeof(req), RTA_OIF, ifindex);
+	if (ifindex)
+		addattr32(&req.n, sizeof(req), RTA_OIF, ifindex);
+	if (gw)
+		addattr_l(&req.n, sizeof(req), RTA_GATEWAY, gw, sizeof(*gw));
+	if (prio)
+		addattr32(&req.n, sizeof(req), RTA_PRIORITY, prio);
 
 	if (rtnl_talk(rth, &req.n, 0, 0, NULL, NULL, NULL, 0) < 0)
 		r = -1;
@@ -576,7 +581,7 @@ int __export ip6route_add(int ifindex, struct in6_addr *dst, int pref_len, int p
 	return r;
 }
 
-int __export ip6route_del(int ifindex, struct in6_addr *dst, int pref_len)
+int __export ip6route_del(int ifindex, const struct in6_addr *dst, int pref_len, const struct in6_addr *gw, int proto, uint32_t prio)
 {
 	struct ipaddr_req {
 		struct nlmsghdr n;
@@ -597,10 +602,17 @@ int __export ip6route_del(int ifindex, struct in6_addr *dst, int pref_len)
 	req.i.rtm_family = AF_INET6;
 	req.i.rtm_table = RT_TABLE_MAIN;
 	req.i.rtm_scope = (pref_len == 128) ? RT_SCOPE_HOST : RT_SCOPE_LINK;
+	req.i.rtm_protocol = proto;
 	req.i.rtm_type = RTN_UNICAST;
 	req.i.rtm_dst_len = pref_len;
 
 	addattr_l(&req.n, sizeof(req), RTA_DST, dst, sizeof(*dst));
+	if (ifindex)
+		addattr32(&req.n, sizeof(req), RTA_OIF, ifindex);
+	if (gw)
+		addattr_l(&req.n, sizeof(req), RTA_GATEWAY, gw, sizeof(*gw));
+	if (prio)
+		addattr32(&req.n, sizeof(req), RTA_PRIORITY, prio);
 
 	if (rtnl_talk(rth, &req.n, 0, 0, NULL, NULL, NULL, 0) < 0)
 		r = -1;

accel-pppd/libnetlink/iputils.h

@@ -24,8 +24,8 @@ int iproute_add(int ifindex, in_addr_t src, in_addr_t dst, in_addr_t gw, int pro
 int iproute_del(int ifindex, in_addr_t dst, int proto, int mask, uint32_t prio);
 in_addr_t iproute_get(in_addr_t dst, in_addr_t *gw);
 
-int ip6route_add(int ifindex, struct in6_addr *dst, int prefix_len, int proto);
-int ip6route_del(int ifindex, struct in6_addr *dst, int prefix_len);
+int ip6route_add(int ifindex, const struct in6_addr *dst, int pref_len, const struct in6_addr *gw, int proto, uint32_t prio);
+int ip6route_del(int ifindex, const struct in6_addr *dst, int pref_len, const struct in6_addr *gw, int proto, uint32_t prio);
 int ip6addr_add(int ifindex, struct in6_addr *addr, int prefix_len);
 int ip6addr_add_peer(int ifindex, struct in6_addr *addr, struct in6_addr *peer_addr);
 int ip6addr_del(int ifindex, struct in6_addr *addr, int prefix_len);