2 * firewall3 - 3rd OpenWrt UCI firewall implementation
4 * Copyright (C) 2013 Jo-Philipp Wich <jo@mein.io>
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22 const struct fw3_option fw3_forward_opts[] = {
23 FW3_OPT("enabled", bool, forward, enabled),
25 FW3_OPT("name", string, forward, name),
26 FW3_OPT("family", family, forward, family),
28 FW3_OPT("src", device, forward, src),
29 FW3_OPT("dest", device, forward, dest),
36 fw3_load_forwards(struct fw3_state *state, struct uci_package *p)
38 struct uci_section *s;
39 struct uci_element *e;
40 struct fw3_forward *forward;
43 INIT_LIST_HEAD(&state->forwards);
45 uci_foreach_element(&p->sections, e)
47 s = uci_to_section(e);
49 if (strcmp(s->type, "forwarding"))
52 forward = calloc(1, sizeof(*forward));
56 forward->enabled = true;
58 fw3_parse_options(forward, fw3_forward_opts, s);
60 if (!forward->enabled)
62 fw3_free_forward(forward);
66 if (forward->src.invert || forward->dest.invert)
68 warn_elem(e, "must not have inverted 'src' or 'dest' options");
69 fw3_free_forward(forward);
72 else if (forward->src.set && !forward->src.any &&
73 !(forward->_src = fw3_lookup_zone(state, forward->src.name)))
75 warn_elem(e, "refers to not existing zone '%s'", forward->src.name);
76 fw3_free_forward(forward);
79 else if (forward->dest.set && !forward->dest.any &&
80 !(forward->_dest = fw3_lookup_zone(state, forward->dest.name)))
82 warn_elem(e, "refers to not existing zone '%s'", forward->dest.name);
83 fw3_free_forward(forward);
87 list_add_tail(&forward->list, &state->forwards);
91 /* Propagate conntrack requirement flag into all zones connected through
92 forwarding entries and repeat until all zones are normalized */
96 list_for_each_entry(forward, &state->forwards, list)
98 /* NB: forward family... */
101 fw3_setbit(forward->_dest->flags[0], FW3_FLAG_ACCEPT);
102 fw3_setbit(forward->_dest->flags[1], FW3_FLAG_ACCEPT);
105 (forward->_src->conntrack != forward->_dest->conntrack))
107 forward->_src->conntrack = true;
108 forward->_dest->conntrack = true;
119 append_chain(struct fw3_ipt_rule *r, struct fw3_forward *forward)
121 if (forward->src.any || !forward->src.set)
122 fw3_ipt_rule_append(r, "FORWARD");
124 fw3_ipt_rule_append(r, "zone_%s_forward", forward->src.name);
127 static void set_target(struct fw3_ipt_rule *r, struct fw3_forward *forward)
129 if (forward->dest.any || !forward->dest.set)
130 fw3_ipt_rule_target(r, "ACCEPT");
132 fw3_ipt_rule_target(r, "zone_%s_dest_ACCEPT", forward->dest.name);
136 print_forward(struct fw3_ipt_handle *handle, struct fw3_forward *forward)
139 struct fw3_ipt_rule *r;
141 if (handle->table != FW3_TABLE_FILTER)
144 if (!fw3_is_family(forward, handle->family))
147 s = forward->_src ? forward->_src->name : "*";
148 d = forward->_dest ? forward->_dest->name : "*";
150 info(" * Forward '%s' -> '%s'", s, d);
152 if (!fw3_is_family(forward->_src, handle->family) ||
153 !fw3_is_family(forward->_dest, handle->family))
155 info(" ! Skipping due to different family of zone");
159 r = fw3_ipt_rule_new(handle);
160 fw3_ipt_rule_comment(r, "forwarding %s -> %s", s, d);
161 set_target(r, forward);
162 append_chain(r, forward);
166 fw3_print_forwards(struct fw3_ipt_handle *handle, struct fw3_state *state)
168 struct fw3_forward *forward;
170 list_for_each_entry(forward, &state->forwards, list)
171 print_forward(handle, forward);