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/*
* firewall3 - 3rd OpenWrt UCI firewall implementation
*
* Copyright (C) 2013 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
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "forwards.h"
const struct fw3_option fw3_forward_opts[] = {
FW3_OPT("enabled", bool, forward, enabled),
FW3_OPT("name", string, forward, name),
FW3_OPT("family", family, forward, family),
FW3_OPT("src", device, forward, src),
FW3_OPT("dest", device, forward, dest),
{ }
};
static bool
check_forward(struct fw3_state *state, struct fw3_forward *forward, struct uci_element *e)
{
if (!forward->enabled)
return false;
if (forward->src.invert || forward->dest.invert)
{
warn_section("forward", forward, e, "must not have inverted 'src' or 'dest' options");
return false;
}
else if (forward->src.set && !forward->src.any &&
!(forward->_src = fw3_lookup_zone(state, forward->src.name)))
{
warn_section("forward", forward, e, "refers to not existing zone '%s'",
forward->src.name);
return false;
}
else if (forward->dest.set && !forward->dest.any &&
!(forward->_dest = fw3_lookup_zone(state, forward->dest.name)))
{
warn_section("forward", forward, e, "refers to not existing zone '%s'",
forward->dest.name);
return false;
}
/* NB: forward family... */
if (forward->_dest)
{
fw3_setbit(forward->_dest->flags[0], FW3_FLAG_ACCEPT);
fw3_setbit(forward->_dest->flags[1], FW3_FLAG_ACCEPT);
}
return true;
}
static struct fw3_forward *
fw3_alloc_forward(struct fw3_state *state)
{
struct fw3_forward *forward;
forward = calloc(1, sizeof(*forward));
if (!forward)
return NULL;
forward->enabled = true;
list_add_tail(&forward->list, &state->forwards);
return forward;
}
void
fw3_load_forwards(struct fw3_state *state, struct uci_package *p,
struct blob_attr *a)
{
struct uci_section *s;
struct uci_element *e;
struct fw3_forward *forward;
struct blob_attr *entry;
unsigned rem;
INIT_LIST_HEAD(&state->forwards);
blob_for_each_attr(entry, a, rem)
{
const char *type;
const char *name = "ubus forward";
if (!fw3_attr_parse_name_type(entry, &name, &type))
continue;
if (strcmp(type, "forwarding"))
continue;
forward = fw3_alloc_forward(state);
if (!forward)
continue;
if (!fw3_parse_blob_options(forward, fw3_forward_opts, entry, name))
{
warn_section("forward", forward, NULL, "skipped due to invalid options");
fw3_free_forward(forward);
continue;
}
if (!check_forward(state, forward, NULL))
fw3_free_forward(forward);
}
uci_foreach_element(&p->sections, e)
{
s = uci_to_section(e);
if (strcmp(s->type, "forwarding"))
continue;
forward = fw3_alloc_forward(state);
if (!forward)
continue;
if (!fw3_parse_options(forward, fw3_forward_opts, s))
warn_elem(e, "has invalid options");
if (!check_forward(state, forward, e))
fw3_free_forward(forward);
}
}
static void
append_chain(struct fw3_ipt_rule *r, struct fw3_forward *forward)
{
if (forward->src.any || !forward->src.set)
fw3_ipt_rule_append(r, "FORWARD");
else
fw3_ipt_rule_append(r, "zone_%s_forward", forward->src.name);
}
static void set_target(struct fw3_ipt_rule *r, struct fw3_forward *forward)
{
if (forward->dest.any || !forward->dest.set)
fw3_ipt_rule_target(r, "ACCEPT");
else
fw3_ipt_rule_target(r, "zone_%s_dest_ACCEPT", forward->dest.name);
}
static void
print_forward(struct fw3_ipt_handle *handle, struct fw3_forward *forward)
{
const char *s, *d;
struct fw3_ipt_rule *r;
if (handle->table != FW3_TABLE_FILTER)
return;
if (!fw3_is_family(forward, handle->family))
return;
s = forward->_src ? forward->_src->name : "*";
d = forward->_dest ? forward->_dest->name : "*";
info(" * Forward '%s' -> '%s'", s, d);
if (!fw3_is_family(forward->_src, handle->family) ||
!fw3_is_family(forward->_dest, handle->family))
{
info(" ! Skipping due to different family of zone");
return;
}
r = fw3_ipt_rule_new(handle);
fw3_ipt_rule_comment(r, "Zone %s to %s forwarding policy", s, d);
set_target(r, forward);
append_chain(r, forward);
}
void
fw3_print_forwards(struct fw3_ipt_handle *handle, struct fw3_state *state)
{
struct fw3_forward *forward;
list_for_each_entry(forward, &state->forwards, list)
print_forward(handle, forward);
}
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