/*
* firewall3 - 3rd OpenWrt UCI firewall implementation
*
- * Copyright (C) 2013-2014 Jo-Philipp Wich <jo@mein.io>
+ * Copyright (C) 2013-2018 Jo-Philipp Wich <jo@mein.io>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
FW3_OPT("dest", device, redirect, dest),
FW3_OPT("ipset", setmatch, redirect, ipset),
+ FW3_OPT("helper", cthelper, redirect, helper),
FW3_LIST("proto", protocol, redirect, proto),
FW3_OPT("reflection", bool, redirect, reflection),
FW3_OPT("reflection_src", reflection_source,
redirect, reflection_src),
+ FW3_LIST("reflection_zone", device, redirect, reflection_zones),
FW3_OPT("target", target, redirect, target),
return false;
}
+ if (r->helper.ptr && r->helper.ptr->family &&
+ r->helper.ptr->family != r->family)
+ {
+ warn_elem(e, "refers to CT helper not supporting family");
+ return false;
+ }
+
if (r->ip_src.family && r->ip_src.family != r->family)
{
warn_elem(e, "uses source ip with different family");
if (!compare_addr(addr, &redir->ip_redir))
continue;
- strncpy(redir->dest.name, zone->name, sizeof(redir->dest.name));
+ strncpy(redir->dest.name, zone->name, sizeof(redir->dest.name) - 1);
redir->dest.set = true;
redir->_dest = zone;
return redir->local;
}
+static void
+select_helper(struct fw3_state *state, struct fw3_redirect *redir)
+{
+ struct fw3_protocol *proto;
+ struct fw3_cthelper *helper;
+ int n_matches = 0;
+
+ if (!state->defaults.auto_helper)
+ return;
+
+ if (!redir->_src || redir->target != FW3_FLAG_DNAT)
+ return;
+
+ if (!redir->port_redir.set || redir->port_redir.invert)
+ return;
+
+ if (redir->helper.set || redir->helper.ptr)
+ return;
+
+ if (list_empty(&redir->proto))
+ return;
+
+ list_for_each_entry(proto, &redir->proto, list)
+ {
+ helper = fw3_lookup_cthelper_by_proto_port(state, proto, &redir->port_redir);
+
+ if (helper)
+ n_matches++;
+ }
+
+ if (n_matches != 1)
+ return;
+
+ /* store pointer to auto-selected helper but set ".set" flag to false,
+ * to allow later code to decide between configured or auto-selected
+ * helpers */
+ redir->helper.set = false;
+ redir->helper.ptr = helper;
+
+ set(redir->_src->flags, FW3_FAMILY_V4, FW3_FLAG_HELPER);
+}
+
static bool
check_redirect(struct fw3_state *state, struct fw3_redirect *redir, struct uci_element *e)
{
}
else if (redir->ipset.set && state->disable_ipsets)
{
- warn_section("redirect", redir, e, "skipped due to disabled ipset support",
- redir->name);
+ warn_section("redirect", redir, e, "skipped due to disabled ipset support");
return false;
}
else if (redir->ipset.set &&
!(redir->ipset.ptr = fw3_lookup_ipset(state, redir->ipset.name)))
{
- warn_section("redirect", redir, e, "refers to unknown ipset '%s'", redir->name,
+ warn_section("redirect", redir, e, "refers to unknown ipset '%s'",
redir->ipset.name);
return false;
}
+ else if (redir->helper.set &&
+ !(redir->helper.ptr = fw3_lookup_cthelper(state, redir->helper.name)))
+ {
+ warn_section("redirect", redir, e, "refers to unknown CT helper '%s'",
+ redir->helper.name);
+ return false;
+ }
if (!check_families(e, redir))
return false;
warn_section("redirect", redir, e, "must not have source '*' for DNAT target");
else if (!redir->_src)
warn_section("redirect", redir, e, "has no source specified");
+ else if (redir->helper.invert)
+ warn_section("redirect", redir, e, "must not use a negated helper match");
else
{
set(redir->_src->flags, FW3_FAMILY_V4, redir->target);
set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_DNAT);
set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_SNAT);
}
+
+ if (redir->helper.ptr)
+ set(redir->_src->flags, FW3_FAMILY_V4, FW3_FLAG_HELPER);
}
}
else
warn_section("redirect", redir, e, "has no src_dip option specified");
else if (!list_empty(&redir->mac_src))
warn_section("redirect", redir, e, "must not use 'src_mac' option for SNAT target");
+ else if (redir->helper.set)
+ warn_section("redirect", redir, e, "must not use 'helper' option for SNAT target");
else
{
set(redir->_dest->flags, FW3_FAMILY_V4, redir->target);
if (!valid)
return false;
- if (!redir->port_redir.set)
+ if (redir->target == FW3_FLAG_DNAT && !redir->port_redir.set)
redir->port_redir = redir->port_dest;
return true;
INIT_LIST_HEAD(&redir->proto);
INIT_LIST_HEAD(&redir->mac_src);
+ INIT_LIST_HEAD(&redir->reflection_zones);
redir->enabled = true;
redir->reflection = true;
continue;
}
- if (!check_redirect(state, redir, NULL))
+ if (!check_redirect(state, redir, NULL)) {
fw3_free_redirect(redir);
+ continue;
+ }
+
+ select_helper(state, redir);
}
uci_foreach_element(&p->sections, e)
continue;
}
- if (!check_redirect(state, redir, e))
+ if (!check_redirect(state, redir, e)) {
fw3_free_redirect(redir);
+ continue;
+ }
+
+ select_helper(state, redir);
}
}
if (port->port_min == port->port_max)
sprintf(buf, "%u", port->port_min);
else
- sprintf(buf, "%u-%u", port->port_min, port->port_max);
+ snprintf(buf, sizeof(buf), "%u-%u", port->port_min, port->port_max);
fw3_ipt_rule_addarg(r, false, "--to-ports", buf);
}
}
static void
-set_comment(struct fw3_ipt_rule *r, const char *name, int num, bool ref)
+set_comment(struct fw3_ipt_rule *r, const char *name, int num, const char *suffix)
{
if (name)
{
- if (ref)
- fw3_ipt_rule_comment(r, "%s (reflection)", name);
+ if (suffix)
+ fw3_ipt_rule_comment(r, "%s (%s)", name, suffix);
else
fw3_ipt_rule_comment(r, name);
}
else
{
- if (ref)
- fw3_ipt_rule_comment(r, "@redirect[%u] (reflection)", num);
+ if (suffix)
+ fw3_ipt_rule_comment(r, "@redirect[%u] (%s)", num, suffix);
else
fw3_ipt_rule_comment(r, "@redirect[%u]", num);
}
fw3_ipt_rule_sport_dport(r, spt, dpt);
fw3_ipt_rule_mac(r, mac);
fw3_ipt_rule_ipset(r, &redir->ipset);
+ fw3_ipt_rule_helper(r, &redir->helper);
fw3_ipt_rule_limit(r, &redir->limit);
fw3_ipt_rule_time(r, &redir->time);
fw3_ipt_rule_mark(r, &redir->mark);
set_target_nat(r, redir);
fw3_ipt_rule_extra(r, redir->extra);
- set_comment(r, redir->name, num, false);
+ set_comment(r, redir->name, num, NULL);
append_chain_nat(r, redir);
break;
+ case FW3_TABLE_RAW:
+ if (redir->target == FW3_FLAG_DNAT && redir->helper.ptr)
+ {
+ if (!fw3_cthelper_check_proto(redir->helper.ptr, proto))
+ {
+ info(" ! Skipping protocol %s since helper '%s' does not support it",
+ fw3_protoname(proto), redir->helper.ptr->name);
+ return;
+ }
+
+ if (!redir->helper.set)
+ info(" - Auto-selected conntrack helper '%s' based on proto/port",
+ redir->helper.ptr->name);
+
+ r = fw3_ipt_rule_create(h, proto, NULL, NULL, &redir->ip_src, &redir->ip_redir);
+ fw3_ipt_rule_sport_dport(r, &redir->port_src, &redir->port_redir);
+ fw3_ipt_rule_mac(r, mac);
+ fw3_ipt_rule_ipset(r, &redir->ipset);
+ fw3_ipt_rule_limit(r, &redir->limit);
+ fw3_ipt_rule_time(r, &redir->time);
+ fw3_ipt_rule_mark(r, &redir->mark);
+ fw3_ipt_rule_addarg(r, false, "-m", "conntrack");
+ fw3_ipt_rule_addarg(r, false, "--ctstate", "DNAT");
+ fw3_ipt_rule_target(r, "CT");
+ fw3_ipt_rule_addarg(r, false, "--helper", redir->helper.ptr->name);
+ set_comment(r, redir->name, num, "CT helper");
+ fw3_ipt_rule_append(r, "zone_%s_helper", redir->_src->name);
+ }
+ break;
+
default:
break;
}
print_reflection(struct fw3_ipt_handle *h, struct fw3_state *state,
struct fw3_redirect *redir, int num,
struct fw3_protocol *proto, struct fw3_address *ra,
- struct fw3_address *ia, struct fw3_address *ea)
+ struct fw3_address *ia, struct fw3_address *ea, struct fw3_device *rz)
{
struct fw3_ipt_rule *r;
fw3_ipt_rule_sport_dport(r, NULL, &redir->port_dest);
fw3_ipt_rule_limit(r, &redir->limit);
fw3_ipt_rule_time(r, &redir->time);
- set_comment(r, redir->name, num, true);
+ set_comment(r, redir->name, num, "reflection");
set_snat_dnat(r, FW3_FLAG_DNAT, &redir->ip_redir, &redir->port_redir);
- fw3_ipt_rule_replace(r, "zone_%s_prerouting", redir->dest.name);
+ fw3_ipt_rule_replace(r, "zone_%s_prerouting", rz->name);
r = fw3_ipt_rule_create(h, proto, NULL, NULL, ia, &redir->ip_redir);
fw3_ipt_rule_sport_dport(r, NULL, &redir->port_redir);
fw3_ipt_rule_limit(r, &redir->limit);
fw3_ipt_rule_time(r, &redir->time);
- set_comment(r, redir->name, num, true);
+ set_comment(r, redir->name, num, "reflection");
set_snat_dnat(r, FW3_FLAG_SNAT, ra, NULL);
- fw3_ipt_rule_replace(r, "zone_%s_postrouting", redir->dest.name);
+ fw3_ipt_rule_replace(r, "zone_%s_postrouting", rz->name);
break;
default:
struct fw3_address *ext_addr, *int_addr, ref_addr;
struct fw3_protocol *proto;
struct fw3_mac *mac;
+ struct fw3_device *reflection_zone;
+ struct fw3_zone *zone;
if (redir->name)
info(" * Redirect '%s'", redir->name);
return;
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)
+ if (!ext_addrs)
goto out;
list_for_each_entry(ext_addr, ext_addrs, list)
if (!fw3_is_family(ext_addr, handle->family))
continue;
- list_for_each_entry(int_addr, int_addrs, list)
+ for (reflection_zone = list_empty(&redir->reflection_zones)
+ ? &redir->dest
+ : list_first_entry(&redir->reflection_zones, struct fw3_device, list);
+ list_empty(&redir->reflection_zones)
+ ? (reflection_zone == &redir->dest)
+ : (&reflection_zone->list != &redir->reflection_zones);
+ reflection_zone = list_empty(&redir->reflection_zones)
+ ? NULL
+ : list_entry(reflection_zone->list.next, struct fw3_device, list))
{
- if (!fw3_is_family(int_addr, handle->family))
+ zone = fw3_lookup_zone(state, reflection_zone->name);
+
+ if (!zone)
continue;
- fw3_foreach(proto, &redir->proto)
+ int_addrs = fw3_resolve_zone_addresses(zone, NULL);
+ list_for_each_entry(int_addr, int_addrs, list)
{
- if (!proto)
+ if (!fw3_is_family(int_addr, handle->family))
continue;
- if (redir->reflection_src == FW3_REFLECTION_INTERNAL)
- ref_addr = *int_addr;
- else
- ref_addr = *ext_addr;
+ fw3_foreach(proto, &redir->proto)
+ {
+ if (!proto)
+ continue;
+
+ if (redir->reflection_src == FW3_REFLECTION_INTERNAL)
+ ref_addr = *int_addr;
+ else
+ ref_addr = *ext_addr;
- ref_addr.mask.v4.s_addr = 0xFFFFFFFF;
- ext_addr->mask.v4.s_addr = 0xFFFFFFFF;
+ 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);
+ print_reflection(handle, state, redir, num, proto,
+ &ref_addr, int_addr, ext_addr, reflection_zone);
+ }
}
}
}
if (handle->family == FW3_FAMILY_V6)
return;
- if (handle->table != FW3_TABLE_FILTER && handle->table != FW3_TABLE_NAT)
+ if (handle->table != FW3_TABLE_FILTER &&
+ handle->table != FW3_TABLE_NAT &&
+ handle->table != FW3_TABLE_RAW)
return;
list_for_each_entry(redir, &state->redirects, list)
+ {
+ if (handle->table == FW3_TABLE_RAW && !redir->helper.ptr)
+ continue;
+
expand_redirect(handle, state, redir, num++);
+ }
}