Cosmetic output changes
[project/firewall3.git] / forwards.c
1 /*
2  * firewall3 - 3rd OpenWrt UCI firewall implementation
3  *
4  *   Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
5  *
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.
9  *
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.
17  */
18
19 #include "forwards.h"
20
21
22 const struct fw3_option fw3_forward_opts[] = {
23         FW3_OPT("enabled",             bool,     forward,     enabled),
24
25         FW3_OPT("name",                string,   forward,     name),
26         FW3_OPT("family",              family,   forward,     family),
27
28         FW3_OPT("src",                 device,   forward,     src),
29         FW3_OPT("dest",                device,   forward,     dest),
30
31         { }
32 };
33
34
35 void
36 fw3_load_forwards(struct fw3_state *state, struct uci_package *p)
37 {
38         struct uci_section *s;
39         struct uci_element *e;
40         struct fw3_forward *forward;
41
42         INIT_LIST_HEAD(&state->forwards);
43
44         uci_foreach_element(&p->sections, e)
45         {
46                 s = uci_to_section(e);
47
48                 if (strcmp(s->type, "forwarding"))
49                         continue;
50
51                 forward = malloc(sizeof(*forward));
52
53                 if (!forward)
54                         continue;
55
56                 memset(forward, 0, sizeof(*forward));
57
58                 forward->enabled = true;
59
60                 fw3_parse_options(forward, fw3_forward_opts, s);
61
62                 if (!forward->enabled)
63                 {
64                         fw3_free_forward(forward);
65                         continue;
66                 }
67
68                 if (forward->src.invert || forward->dest.invert)
69                 {
70                         warn_elem(e, "must not have inverted 'src' or 'dest' options");
71                         fw3_free_forward(forward);
72                         continue;
73                 }
74                 else if (forward->src.set && !forward->src.any &&
75                          !(forward->_src = fw3_lookup_zone(state, forward->src.name, false)))
76                 {
77                         warn_elem(e, "refers to not existing zone '%s'", forward->src.name);
78                         fw3_free_forward(forward);
79                         continue;
80                 }
81                 else if (forward->dest.set && !forward->dest.any &&
82                          !(forward->_dest = fw3_lookup_zone(state, forward->dest.name, false)))
83                 {
84                         warn_elem(e, "refers to not existing zone '%s'", forward->dest.name);
85                         fw3_free_forward(forward);
86                         continue;
87                 }
88
89                 if (forward->_dest)
90                 {
91                         setbit(forward->_dest->flags, FW3_TARGET_ACCEPT);
92
93                         if (forward->_src &&
94                             (forward->_src->conntrack || forward->_dest->conntrack))
95                         {
96                                 forward->_src->conntrack = forward->_dest->conntrack = true;
97                         }
98                 }
99
100                 list_add_tail(&forward->list, &state->forwards);
101                 continue;
102         }
103 }
104
105
106 static void
107 print_chain(struct fw3_forward *forward)
108 {
109         if (forward->src.any || !forward->src.set)
110                 fw3_pr("-A delegate_forward");
111         else
112                 fw3_pr("-A zone_%s_forward", forward->src.name);
113 }
114
115 static void print_target(struct fw3_forward *forward)
116 {
117         if (forward->dest.any || !forward->dest.set)
118                 fw3_pr(" -j ACCEPT\n");
119         else
120                 fw3_pr(" -j zone_%s_dest_ACCEPT\n", forward->dest.name);
121 }
122
123 static void
124 print_forward(enum fw3_table table, enum fw3_family family,
125               struct fw3_forward *forward)
126 {
127         const char *s, *d;
128
129         if (table != FW3_TABLE_FILTER)
130                 return;
131
132         if (!fw3_is_family(forward, family))
133                 return;
134
135         s = forward->_src  ? forward->_src->name  : "*";
136         d = forward->_dest ? forward->_dest->name : "*";
137
138         info("   * Forward '%s' -> '%s'", s, d);
139
140         if (!fw3_is_family(forward->_src, family) ||
141             !fw3_is_family(forward->_dest, family))
142         {
143                 info("     ! Skipping due to different family of zone");
144                 return;
145         }
146
147         print_chain(forward);
148         fw3_format_comment("forwarding ", s, "->", d);
149         print_target(forward);
150 }
151
152 void
153 fw3_print_forwards(enum fw3_table table, enum fw3_family family,
154                    struct fw3_state *state)
155 {
156         struct fw3_forward *forward;
157
158         list_for_each_entry(forward, &state->forwards, list)
159                 print_forward(table, family, forward);
160 }