redirects: respect src_dip option for reflection rules
[project/firewall3.git] / redirects.c
index 080e2c1..a30c540 100644 (file)
@@ -116,14 +116,11 @@ check_families(struct uci_element *e, struct fw3_redirect *r)
 static bool
 compare_addr(struct fw3_address *a, struct fw3_address *b)
 {
-       uint32_t mask;
-
        if (a->family != FW3_FAMILY_V4 || b->family != FW3_FAMILY_V4)
                return false;
 
-       mask = htonl(~((1 << (32 - a->mask)) - 1));
-
-       return ((a->address.v4.s_addr & mask) == (b->address.v4.s_addr & mask));
+       return ((a->address.v4.s_addr & a->mask.v4.s_addr) ==
+               (b->address.v4.s_addr & a->mask.v4.s_addr));
 }
 
 static bool
@@ -139,7 +136,7 @@ resolve_dest(struct uci_element *e, struct fw3_redirect *redir,
 
        list_for_each_entry(zone, &state->zones, list)
        {
-               addrs = fw3_resolve_zone_addresses(zone);
+               addrs = fw3_resolve_zone_addresses(zone, NULL);
 
                if (!addrs)
                        continue;
@@ -191,12 +188,11 @@ check_local(struct uci_element *e, struct fw3_redirect *redir,
                        fw3_ubus_address(&addrs, net->name);
                        list_for_each_entry_safe(addr, tmp, &addrs, list)
                        {
-                               if (compare_addr(&redir->ip_redir, addr)) {
+                               if (!redir->local && compare_addr(&redir->ip_redir, addr)) {
                                        warn_elem(e, "refers to a destination address on this router, "
                                                     "assuming port redirection");
 
                                        redir->local = true;
-                                       continue;
                                }
 
                                list_del(&addr->list);
@@ -379,6 +375,24 @@ append_chain_nat(struct fw3_ipt_rule *r, struct fw3_redirect *redir)
 }
 
 static void
+set_redirect(struct fw3_ipt_rule *r, struct fw3_port *port)
+{
+       char buf[sizeof("65535-65535\0")];
+
+       fw3_ipt_rule_target(r, "REDIRECT");
+
+       if (port && port->set)
+       {
+               if (port->port_min == port->port_max)
+                       sprintf(buf, "%u", port->port_min);
+               else
+                       sprintf(buf, "%u-%u", port->port_min, port->port_max);
+
+               fw3_ipt_rule_addarg(r, false, "--to-ports", buf);
+       }
+}
+
+static void
 set_snat_dnat(struct fw3_ipt_rule *r, enum fw3_flag target,
               struct fw3_address *addr, struct fw3_port *port)
 {
@@ -415,7 +429,9 @@ set_snat_dnat(struct fw3_ipt_rule *r, enum fw3_flag target,
 static void
 set_target_nat(struct fw3_ipt_rule *r, struct fw3_redirect *redir)
 {
-       if (redir->target == FW3_FLAG_DNAT)
+       if (redir->local)
+               set_redirect(r, &redir->port_redir);
+       else if (redir->target == FW3_FLAG_DNAT)
                set_snat_dnat(r, redir->target, &redir->ip_redir, &redir->port_redir);
        else
                set_snat_dnat(r, redir->target, &redir->ip_dest, &redir->port_dest);
@@ -571,14 +587,14 @@ expand_redirect(struct fw3_ipt_handle *handle, struct fw3_state *state,
                print_redirect(handle, state, redir, num, proto, mac);
 
        /* reflection rules */
-       if (redir->target != FW3_FLAG_DNAT || !redir->reflection)
+       if (redir->target != FW3_FLAG_DNAT || !redir->reflection || redir->local)
                return;
 
        if (!redir->_dest || !redir->_src->masq)
                return;
 
-       ext_addrs = fw3_resolve_zone_addresses(redir->_src);
-       int_addrs = fw3_resolve_zone_addresses(redir->_dest);
+       ext_addrs = fw3_resolve_zone_addresses(redir->_src, &redir->ip_dest);
+       int_addrs = fw3_resolve_zone_addresses(redir->_dest, NULL);
 
        if (!ext_addrs || !int_addrs)
                goto out;
@@ -603,8 +619,8 @@ expand_redirect(struct fw3_ipt_handle *handle, struct fw3_state *state,
                                else
                                        ref_addr = *ext_addr;
 
-                               ref_addr.mask = 32;
-                               ext_addr->mask = 32;
+                               ref_addr.mask.v4.s_addr = 0xFFFFFFFF;
+                               ext_addr->mask.v4.s_addr = 0xFFFFFFFF;
 
                                print_reflection(handle, state, redir, num, proto,
                                                                 &ref_addr, int_addr, ext_addr);