/*
* firewall3 - 3rd OpenWrt UCI firewall implementation
*
- * Copyright (C) 2013-2014 Jo-Philipp Wich <jow@openwrt.org>
+ * 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),
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");
list_for_each_entry(zone, &state->zones, list)
{
- addrs = fw3_resolve_zone_addresses(zone);
+ addrs = fw3_resolve_zone_addresses(zone, NULL);
if (!addrs)
continue;
check_local(struct uci_element *e, struct fw3_redirect *redir,
struct fw3_state *state)
{
- struct fw3_zone *zone;
- struct fw3_device *net;
- struct fw3_address *addr, *tmp;
-
if (redir->target != FW3_FLAG_DNAT)
return false;
if (!redir->ip_redir.set)
redir->local = true;
- if (redir->local)
- return true;
+ return redir->local;
+}
- list_for_each_entry(zone, &state->zones, list)
+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)
+{
+ bool valid;
+
+ if (!redir->enabled)
+ return false;
+
+ if (redir->src.invert)
+ {
+ warn_section("redirect", redir, e, "must not have an inverted source");
+ return false;
+ }
+ else if (redir->src.set && !redir->src.any &&
+ !(redir->_src = fw3_lookup_zone(state, redir->src.name)))
+ {
+ warn_section("redirect", redir, e, "refers to not existing zone '%s'",
+ redir->src.name);
+ return false;
+ }
+ else if (redir->dest.set && !redir->dest.any &&
+ !(redir->_dest = fw3_lookup_zone(state, redir->dest.name)))
+ {
+ warn_section("redirect", redir, e, "refers to not existing zone '%s'",
+ redir->dest.name);
+ return false;
+ }
+ else if (redir->ipset.set && state->disable_ipsets)
{
- list_for_each_entry(net, &zone->networks, list)
+ warn_section("redirect", redir, e, "skipped due to disabled ipset support",
+ redir->name);
+ 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,
+ 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;
+
+ if (redir->target == FW3_FLAG_UNSPEC)
+ {
+ warn_section("redirect", redir, e, "has no target specified, defaulting to DNAT");
+ redir->target = FW3_FLAG_DNAT;
+ }
+ else if (redir->target < FW3_FLAG_DNAT || redir->target > FW3_FLAG_SNAT)
+ {
+ warn_section("redirect", redir, e, "has invalid target specified, defaulting to DNAT");
+ redir->target = FW3_FLAG_DNAT;
+ }
+
+ valid = false;
+
+ if (redir->target == FW3_FLAG_DNAT)
+ {
+ if (redir->src.any)
+ 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
{
- LIST_HEAD(addrs);
+ set(redir->_src->flags, FW3_FAMILY_V4, redir->target);
+ valid = true;
- fw3_ubus_address(&addrs, net->name);
- list_for_each_entry_safe(addr, tmp, &addrs, list)
+ if (!check_local(e, redir, state) && !redir->dest.set &&
+ resolve_dest(e, redir, state))
{
- if (compare_addr(&redir->ip_redir, addr)) {
- warn_elem(e, "refers to a destination address on this router, "
- "assuming port redirection");
-
- redir->local = true;
- continue;
- }
+ warn_section("redirect", redir, e,
+ "does not specify a destination, assuming '%s'",
+ redir->dest.name);
+ }
- list_del(&addr->list);
- free(addr);
+ if (redir->reflection && redir->_dest && redir->_src->masq)
+ {
+ set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_ACCEPT);
+ set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_DNAT);
+ set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_SNAT);
}
- if (redir->local)
- return true;
+ if (redir->helper.ptr)
+ set(redir->_src->flags, FW3_FAMILY_V4, FW3_FLAG_HELPER);
+ }
+ }
+ else
+ {
+ if (redir->dest.any)
+ warn_section("redirect", redir, e,
+ "must not have destination '*' for SNAT target");
+ else if (!redir->_dest)
+ warn_section("redirect", redir, e, "has no destination specified");
+ else if (!redir->ip_dest.set)
+ 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);
+ valid = true;
}
}
- return false;
+ if (list_empty(&redir->proto))
+ {
+ warn_section("redirect", redir, e, "does not specify a protocol, assuming TCP+UDP");
+ fw3_parse_protocol(&redir->proto, "tcpudp", true);
+ }
+
+ if (!valid)
+ return false;
+
+ if (!redir->port_redir.set)
+ redir->port_redir = redir->port_dest;
+
+ return true;
}
-void
-fw3_load_redirects(struct fw3_state *state, struct uci_package *p)
+static struct fw3_redirect *
+fw3_alloc_redirect(struct fw3_state *state)
{
- struct uci_section *s;
- struct uci_element *e;
struct fw3_redirect *redir;
- bool valid;
+ redir = calloc(1, sizeof(*redir));
+ if (!redir)
+ return NULL;
- INIT_LIST_HEAD(&state->redirects);
+ INIT_LIST_HEAD(&redir->proto);
+ INIT_LIST_HEAD(&redir->mac_src);
- uci_foreach_element(&p->sections, e)
- {
- s = uci_to_section(e);
+ redir->enabled = true;
+ redir->reflection = true;
- if (strcmp(s->type, "redirect"))
- continue;
+ list_add_tail(&redir->list, &state->redirects);
- redir = calloc(1, sizeof(*redir));
- if (!redir)
- continue;
+ return redir;
+}
- INIT_LIST_HEAD(&redir->proto);
- INIT_LIST_HEAD(&redir->mac_src);
+void
+fw3_load_redirects(struct fw3_state *state, struct uci_package *p,
+ struct blob_attr *a)
+{
+ struct uci_section *s;
+ struct uci_element *e;
+ struct fw3_redirect *redir;
+ struct blob_attr *entry;
+ unsigned rem;
- redir->enabled = true;
- redir->reflection = true;
+ INIT_LIST_HEAD(&state->redirects);
- valid = false;
+ blob_for_each_attr(entry, a, rem)
+ {
+ const char *type;
+ const char *name = "ubus redirect";
- if (!fw3_parse_options(redir, fw3_redirect_opts, s))
- {
- warn_elem(e, "skipped due to invalid options");
- fw3_free_redirect(redir);
+ if (!fw3_attr_parse_name_type(entry, &name, &type))
continue;
- }
- if (!redir->enabled)
- {
- fw3_free_redirect(redir);
+ if (strcmp(type, "redirect"))
continue;
- }
- if (redir->src.invert)
- {
- warn_elem(e, "must not have an inverted source");
- fw3_free_redirect(redir);
- continue;
- }
- else if (redir->src.set && !redir->src.any &&
- !(redir->_src = fw3_lookup_zone(state, redir->src.name)))
- {
- warn_elem(e, "refers to not existing zone '%s'", redir->src.name);
- fw3_free_redirect(redir);
- continue;
- }
- else if (redir->dest.set && !redir->dest.any &&
- !(redir->_dest = fw3_lookup_zone(state, redir->dest.name)))
- {
- warn_elem(e, "refers to not existing zone '%s'", redir->dest.name);
- fw3_free_redirect(redir);
- continue;
- }
- else if (redir->ipset.set && state->disable_ipsets)
- {
- warn_elem(e, "skipped due to disabled ipset support");
- fw3_free_redirect(redir);
+ redir = fw3_alloc_redirect(state);
+ if (!redir)
continue;
- }
- else if (redir->ipset.set &&
- !(redir->ipset.ptr = fw3_lookup_ipset(state, redir->ipset.name)))
+
+ if (!fw3_parse_blob_options(redir, fw3_redirect_opts, entry, name))
{
- warn_elem(e, "refers to unknown ipset '%s'", redir->ipset.name);
+ warn_section("redirect", redir, NULL, "skipped due to invalid options");
fw3_free_redirect(redir);
continue;
}
- if (!check_families(e, redir))
- {
+ if (!check_redirect(state, redir, NULL)) {
fw3_free_redirect(redir);
continue;
}
- if (redir->target == FW3_FLAG_UNSPEC)
- {
- warn_elem(e, "has no target specified, defaulting to DNAT");
- redir->target = FW3_FLAG_DNAT;
- }
- else if (redir->target < FW3_FLAG_DNAT || redir->target > FW3_FLAG_SNAT)
- {
- warn_elem(e, "has invalid target specified, defaulting to DNAT");
- redir->target = FW3_FLAG_DNAT;
- }
+ select_helper(state, redir);
+ }
- if (redir->target == FW3_FLAG_DNAT)
- {
- if (redir->src.any)
- warn_elem(e, "must not have source '*' for DNAT target");
- else if (!redir->_src)
- warn_elem(e, "has no source specified");
- else
- {
- set(redir->_src->flags, FW3_FAMILY_V4, redir->target);
- redir->_src->conntrack = true;
- valid = true;
- }
+ uci_foreach_element(&p->sections, e)
+ {
+ s = uci_to_section(e);
- if (!check_local(e, redir, state) && !redir->dest.set &&
- resolve_dest(e, redir, state))
- {
- warn_elem(e, "does not specify a destination, assuming '%s'",
- redir->dest.name);
- }
+ if (strcmp(s->type, "redirect"))
+ continue;
- if (redir->reflection && redir->_dest && redir->_src->masq)
- {
- set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_ACCEPT);
- set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_DNAT);
- set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_SNAT);
- }
- }
- else
- {
- if (redir->dest.any)
- warn_elem(e, "must not have destination '*' for SNAT target");
- else if (!redir->_dest)
- warn_elem(e, "has no destination specified");
- else if (!redir->ip_dest.set)
- warn_elem(e, "has no src_dip option specified");
- else if (!list_empty(&redir->mac_src))
- warn_elem(e, "must not use 'src_mac' option for SNAT target");
- else
- {
- set(redir->_dest->flags, FW3_FAMILY_V4, redir->target);
- redir->_dest->conntrack = true;
- valid = true;
- }
- }
+ redir = fw3_alloc_redirect(state);
+ if (!redir)
+ continue;
- if (list_empty(&redir->proto))
+ if (!fw3_parse_options(redir, fw3_redirect_opts, s))
{
- warn_elem(e, "does not specify a protocol, assuming TCP+UDP");
- fw3_parse_protocol(&redir->proto, "tcpudp", true);
+ warn_elem(e, "skipped due to invalid options");
+ fw3_free_redirect(redir);
+ continue;
}
- if (!valid)
- {
+ if (!check_redirect(state, redir, e)) {
fw3_free_redirect(redir);
continue;
}
- if (!redir->port_redir.set)
- redir->port_redir = redir->port_dest;
-
- list_add_tail(&redir->list, &state->redirects);
+ select_helper(state, 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)
{
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);
}
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;
}
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_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);
break;
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;
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++);
+ }
}
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