blob: 82939b941661c20e4d2b918771ab404e6970999c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
|
# Copyright (C) 2009-2010 OpenWrt.org
# Copyright (C) 2008 John Crispin <blogic@openwrt.org>
FW_INITIALIZED=
FW_ZONES=
FW_CONNTRACK_ZONES=
FW_NOTRACK_DISABLED=
FW_DEFAULTS_APPLIED=
FW_ADD_CUSTOM_CHAINS=
FW_ACCEPT_REDIRECTS=
FW_ACCEPT_SRC_ROUTE=
FW_DEFAULT_INPUT_POLICY=REJECT
FW_DEFAULT_OUTPUT_POLICY=REJECT
FW_DEFAULT_FORWARD_POLICY=REJECT
fw_load_defaults() {
fw_config_get_section "$1" defaults { \
string input $FW_DEFAULT_INPUT_POLICY \
string output $FW_DEFAULT_OUTPUT_POLICY \
string forward $FW_DEFAULT_FORWARD_POLICY \
boolean drop_invalid 0 \
boolean syn_flood 0 \
boolean synflood_protect 0 \
string synflood_rate 25 \
string synflood_burst 50 \
boolean tcp_syncookies 1 \
boolean tcp_ecn 0 \
boolean tcp_westwood 0 \
boolean tcp_window_scaling 1 \
boolean accept_redirects 0 \
boolean accept_source_route 0 \
boolean custom_chains 1 \
} || return
[ -n "$FW_DEFAULTS_APPLIED" ] && {
echo "Error: multiple defaults sections detected"
return 1
}
FW_DEFAULTS_APPLIED=1
FW_DEFAULT_INPUT_POLICY=$defaults_input
FW_DEFAULT_OUTPUT_POLICY=$defaults_output
FW_DEFAULT_FORWARD_POLICY=$defaults_forward
FW_ADD_CUSTOM_CHAINS=$defaults_custom_chains
FW_ACCEPT_REDIRECTS=$defaults_accept_redirects
FW_ACCEPT_SRC_ROUTE=$defaults_accept_source_route
fw_callback pre defaults
# Seems like there are only one sysctl for both IP versions.
for s in syncookies ecn westwood window_scaling; do
eval "sysctl -e -w net.ipv4.tcp_${s}=\$defaults_tcp_${s}" >/dev/null
done
fw_sysctl_interface all
[ $defaults_drop_invalid == 1 ] && {
fw add i f INPUT DROP { -m state --state INVALID }
fw add i f OUTPUT DROP { -m state --state INVALID }
fw add i f FORWARD DROP { -m state --state INVALID }
FW_NOTRACK_DISABLED=1
}
fw add i f INPUT ACCEPT { -m state --state RELATED,ESTABLISHED }
fw add i f OUTPUT ACCEPT { -m state --state RELATED,ESTABLISHED }
fw add i f FORWARD ACCEPT { -m state --state RELATED,ESTABLISHED }
fw add i f INPUT ACCEPT { -i lo }
fw add i f OUTPUT ACCEPT { -o lo }
# Compatibility to old 'syn_flood' parameter
[ $defaults_syn_flood == 1 ] && \
defaults_synflood_protect=1
[ $defaults_synflood_protect == 1 ] && {
echo "Loading synflood protection"
fw_callback pre synflood
fw add i f syn_flood
fw add i f syn_flood RETURN { \
-p tcp --syn \
-m limit --limit "${defaults_synflood_rate}/second" --limit-burst "${defaults_synflood_burst}" \
}
fw add i f syn_flood DROP
fw add i f INPUT syn_flood { -p tcp --syn }
fw_callback post synflood
}
[ $defaults_custom_chains == 1 ] && {
echo "Adding custom chains"
fw add i f input_rule
fw add i f output_rule
fw add i f forwarding_rule
fw add i n prerouting_rule
fw add i n postrouting_rule
fw add i f INPUT input_rule
fw add i f OUTPUT output_rule
fw add i f FORWARD forwarding_rule
fw add i n PREROUTING prerouting_rule
fw add i n POSTROUTING postrouting_rule
}
fw add i f input
fw add i f output
fw add i f forward
fw add i f INPUT input
fw add i f OUTPUT output
fw add i f FORWARD forward
fw add i f reject
fw add i f reject REJECT { --reject-with tcp-reset -p tcp }
fw add i f reject REJECT { --reject-with port-unreach }
fw_set_filter_policy
fw_callback post defaults
}
fw_config_get_zone() {
[ "${zone_NAME}" != "$1" ] || return
fw_config_get_section "$1" zone { \
string name "$1" \
string network "" \
string input "$FW_DEFAULT_INPUT_POLICY" \
string output "$FW_DEFAULT_OUTPUT_POLICY" \
string forward "$FW_DEFAULT_FORWARD_POLICY" \
boolean masq 0 \
boolean conntrack 0 \
boolean mtu_fix 0 \
boolean custom_chains "$FW_ADD_CUSTOM_CHAINS" \
} || return
[ -n "$zone_name" ] || zone_name=$zone_NAME
[ -n "$zone_network" ] || zone_network=$zone_name
}
fw_load_zone() {
fw_config_get_zone "$1"
list_contains FW_ZONES $zone_name && {
fw_die "zone ${zone_name}: duplicated zone"
}
append FW_ZONES $zone_name
fw_callback pre zone
[ $zone_conntrack = 1 -o $zone_masq = 1 ] && \
append FW_CONNTRACK_ZONES "$zone_NAME"
local chain=zone_${zone_name}
fw add i f ${chain}_ACCEPT
fw add i f ${chain}_DROP
fw add i f ${chain}_REJECT
fw add i f ${chain}_MSSFIX
# TODO: Rename to ${chain}_input
fw add i f ${chain}
fw add i f ${chain} ${chain}_${zone_input} $
fw add i f ${chain}_forward
fw add i f ${chain}_forward ${chain}_${zone_forward} $
# TODO: add ${chain}_output
fw add i f output ${chain}_${zone_output} $
# TODO: Rename to ${chain}_MASQUERADE
fw add i n ${chain}_nat
fw add i n ${chain}_prerouting
fw add i r ${chain}_notrack
[ $zone_masq == 1 ] && \
fw add i n POSTROUTING ${chain}_nat $
[ $zone_mtu_fix == 1 ] && \
fw add i f FORWARD ${chain}_MSSFIX ^
[ $zone_custom_chains == 1 ] && {
[ $FW_ADD_CUSTOM_CHAINS == 1 ] || \
fw_die "zone ${zone_name}: custom_chains globally disabled"
fw add i f input_${zone_name}
fw add i f ${chain} input_${zone_name} ^
fw add i f forwarding_${zone_name}
fw add i f ${chain}_forward forwarding_${zone_name} ^
fw add i n prerouting_${zone_name}
fw add i n ${chain}_prerouting prerouting_${zone_name} ^
}
fw_callback post zone
}
fw_load_notrack_zone() {
list_contains FW_CONNTRACK_ZONES "$1" && return
fw_config_get_zone "$1"
fw_callback pre notrack
fw add i f zone_${zone_name}_notrack NOTRACK $
fw_callback post notrack
}
fw_load_include() {
local name="$1"
local path; config_get path ${name} path
[ -e $path ] && . $path
}
fw_clear() {
local policy=$1
fw_set_filter_policy $policy
local tab
for tab in f n r; do
fw del i $tab
done
}
fw_set_filter_policy() {
local policy=$1
local chn tgt
for chn in INPUT OUTPUT FORWARD; do
eval "tgt=\${policy:-\${FW_DEFAULT_${chn}_POLICY}}"
[ $tgt == "REJECT" ] && tgt=reject
[ $tgt == "ACCEPT" -o $tgt == "DROP" ] || {
fw add i f $chn $tgt $
tgt=DROP
}
fw policy i f $chn $tgt
done
}
fw_callback() {
local pp=$1
local hk=$2
local libs lib
eval "libs=\$FW_CB_${pp}_${hk}"
[ -n "$libs" ] || return
for lib in $libs; do
${lib}_${pp}_${hk}_cb
done
}
|
