root/usr/share/firewall4/templates/ruleset.uc

   1 table inet fw4
   2 flush table inet fw4
   3
   4 table inet fw4 {
   5         #
   6         # Set definitions
   7         #
   8
   9 {% for (let set in fw4.ipsets()): %}
  10         set {{ set.name }} {
  11                 type {{ fw4.concat(set.types) }}
  12 {%  if (set.maxelem > 0): %}
  13                 size {{ set.maxelem }}
  14 {%  endif %}
  15 {%  if (set.interval): %}
  16                 flags interval
  17 {%  endif %}
  18 {%  fw4.print_setentries(set) %}
  19         }
  20
  21 {% endfor %}
  22
  23         #
  24         # Defines
  25         #
  26
  27 {% for (let zone in fw4.zones()): %}
  28 {%  if (length(zone.match_devices)): %}
  29         define {{ zone.name }}_devices = {{ fw4.set(zone.match_devices, true) }}
  30 {%  endif %}
  31 {%  if (length(zone.match_subnets)): %}
  32         define {{ zone.name }}_subnets = {{ fw4.set(zone.match_subnets, true) }}
  33 {%  endif %}
  34 {% endfor %}
  35
  36         #
  37         # User includes
  38         #
  39
  40         include "/etc/nftables.d/*.nft"
  41
  42
  43         #
  44         # Filter rules
  45         #
  46
  47         chain input {
  48                 type filter hook input priority filter; policy {{ fw4.input_policy(true) }};
  49
  50                 iifname "lo" accept comment "!fw4: Accept traffic from loopback"
  51
  52                 ct state established,related accept comment "!fw4: Allow inbound established and related flows"
  53 {% if (fw4.default_option("drop_invalid")): %}
  54                 ct state invalid drop comment "!fw4: Drop flows with invalid conntrack state"
  55 {% endif %}
  56 {% if (fw4.default_option("synflood_protect")): %}
  57                 tcp flags & (fin | syn | rst | ack) == syn jump syn_flood comment "!fw4: Rate limit TCP syn packets"
  58 {% endif %}
  59 {% for (let rule in fw4.rules("input")): %}
  60                 {%+ include("rule.uc", { fw4, rule }) %}
  61 {% endfor %}
  62 {% for (let zone in fw4.zones()): for (let rule in zone.match_rules): %}
  63                 {%+ include("zone-match.uc", { fw4, zone, rule, direction: "input" }) %}
  64 {% endfor; endfor %}
  65 {% if (fw4.input_policy() == "reject"): %}
  66                 jump handle_reject
  67 {% endif %}
  68         }
  69
  70         chain forward {
  71                 type filter hook forward priority filter; policy {{ fw4.forward_policy(true) }};
  72
  73                 ct state established,related accept comment "!fw4: Allow forwarded established and related flows"
  74 {% if (fw4.default_option("drop_invalid")): %}
  75                 ct state invalid drop comment "!fw4: Drop flows with invalid conntrack state"
  76 {% endif %}
  77 {% for (let rule in fw4.rules("forward")): %}
  78                 {%+ include("rule.uc", { fw4, rule }) %}
  79 {% endfor %}
  80 {% for (let zone in fw4.zones()): for (let rule in zone.match_rules): %}
  81                 {%+ include("zone-match.uc", { fw4, zone, rule, direction: "forward" }) %}
  82 {% endfor; endfor %}
  83 {% if (fw4.forward_policy() == "reject"): %}
  84                 jump handle_reject
  85 {% endif %}
  86         }
  87
  88         chain output {
  89                 type filter hook output priority filter; policy {{ fw4.output_policy(true) }};
  90
  91                 oifname "lo" accept comment "!fw4: Accept traffic towards loopback"
  92
  93                 ct state established,related accept comment "!fw4: Allow outbound established and related flows"
  94 {% if (fw4.default_option("drop_invalid")): %}
  95                 ct state invalid drop comment "!fw4: Drop flows with invalid conntrack state"
  96 {% endif %}
  97 {% for (let rule in fw4.rules("output")): %}
  98                 {%+ include("rule.uc", { fw4, rule }) %}
  99 {% endfor %}
 100 {% for (let zone in fw4.zones()): for (let rule in zone.match_rules): %}
 101                 {%+ include("zone-match.uc", { fw4, zone, rule, direction: "output" }) %}
 102 {% endfor; endfor %}
 103 {% if (fw4.output_policy() == "reject"): %}
 104                 jump handle_reject
 105 {% endif %}
 106         }
 107
 108         chain handle_reject {
 109                 meta l4proto tcp reject with {{
 110                         (fw4.default_option("tcp_reject_code") != "tcp-reset")
 111                                 ? "icmpx type " + fw4.default_option("tcp_reject_code")
 112                                 : "tcp reset"
 113                 }} comment "!fw4: Reject TCP traffic"
 114                 reject with {{
 115                         (fw4.default_option("any_reject_code") != "tcp-reset")
 116                                 ? "icmpx type " + fw4.default_option("any_reject_code")
 117                                 : "tcp reset"
 118                 }} comment "!fw4: Reject any other traffic"
 119         }
 120
 121 {% if (fw4.default_option("synflood_protect")):
 122         let r = fw4.default_option("synflood_rate");
 123         let b = fw4.default_option("synflood_burst");
 124 %}
 125         chain syn_flood {
 126                 tcp flags & (fin | syn | rst | ack) == syn
 127                 {%- if (r): %} limit rate {{ r.rate }}/{{ r.unit }}{% endif %}
 128                 {%- if (b): %} burst {{ b }} packets{% endif %} return comment "!fw4: Accept SYN packets below rate-limit"
 129                 drop comment "!fw4: Drop excess packets"
 130         }
 131
 132 {% endif %}
 133 {% for (let zone in fw4.zones()): %}
 134         chain input_{{ zone.name }} {
 135 {%  for (let rule in fw4.rules("input_"+zone.name)): %}
 136                 {%+ include("rule.uc", { fw4, rule }) %}
 137 {%  endfor %}
 138 {%  if (zone.dflags.dnat): %}
 139                 ct status dnat accept comment "!fw4: Accept port redirections"
 140 {%  endif %}
 141                 jump {{ zone.input }}_from_{{ zone.name }}
 142         }
 143
 144         chain output_{{ zone.name }} {
 145 {%  for (let rule in fw4.rules("output_"+zone.name)): %}
 146                 {%+ include("rule.uc", { fw4, rule }) %}
 147 {%  endfor %}
 148                 jump {{ zone.output }}_to_{{ zone.name }}
 149         }
 150
 151         chain forward_{{ zone.name }} {
 152 {%  for (let rule in fw4.rules("forward_"+zone.name)): %}
 153                 {%+ include("rule.uc", { fw4, rule }) %}
 154 {%  endfor %}
 155 {%  if (zone.dflags.dnat): %}
 156                 ct status dnat accept comment "!fw4: Accept port forwards"
 157 {%  endif %}
 158                 jump {{ zone.forward }}_to_{{ zone.name }}
 159         }
 160
 161 {%  for (let verdict in ["accept", "reject", "drop"]): %}
 162 {%   if (zone.sflags[verdict]): %}
 163         chain {{ verdict }}_from_{{ zone.name }} {
 164 {%    for (let rule in zone.match_rules): %}
 165                 {%+ include("zone-verdict.uc", { fw4, zone, rule, egress: false, verdict }) %}
 166 {%    endfor %}
 167         }
 168
 169 {%   endif %}
 170 {%   if (zone.dflags[verdict]): %}
 171         chain {{ verdict }}_to_{{ zone.name }} {
 172 {%   for (let rule in zone.match_rules): %}
 173                 {%+ include("zone-verdict.uc", { fw4, zone, rule, egress: true, verdict }) %}
 174 {%   endfor %}
 175         }
 176
 177 {%   endif %}
 178 {%  endfor %}
 179 {% endfor %}
 180
 181         #
 182         # NAT rules
 183         #
 184
 185         chain dstnat {
 186                 type nat hook prerouting priority dstnat; policy accept;
 187 {% for (let zone in fw4.zones()): %}
 188 {%  if (zone.dflags.dnat): %}
 189 {%   for (let rule in zone.match_rules): %}
 190                 {%+ include("zone-match.uc", { fw4, zone, rule, direction: "dstnat" }) %}
 191 {%   endfor %}
 192 {%  endif %}
 193 {% endfor %}
 194         }
 195
 196         chain srcnat {
 197                 type nat hook postrouting priority srcnat; policy accept;
 198 {% for (let redirect in fw4.redirects("srcnat")): %}
 199                 {%+ include("redirect.uc", { fw4, redirect }) %}
 200 {% endfor %}
 201 {% for (let zone in fw4.zones()): %}
 202 {%  if (zone.dflags.snat): %}
 203 {%   for (let rule in zone.match_rules): %}
 204                 {%+ include("zone-match.uc", { fw4, zone, rule, direction: "srcnat" }) %}
 205 {%   endfor %}
 206 {%  endif %}
 207 {% endfor %}
 208         }
 209
 210 {% for (let zone in fw4.zones()): %}
 211 {%  if (zone.dflags.dnat): %}
 212         chain dstnat_{{ zone.name }} {
 213 {% for (let redirect in fw4.redirects("dstnat_"+zone.name)): %}
 214                 {%+ include("redirect.uc", { fw4, redirect }) %}
 215 {% endfor %}
 216         }
 217
 218 {%  endif %}
 219 {%  if (zone.dflags.snat): %}
 220         chain srcnat_{{ zone.name }} {
 221 {% for (let redirect in fw4.redirects("srcnat_"+zone.name)): %}
 222                 {%+ include("redirect.uc", { fw4, redirect }) %}
 223 {% endfor %}
 224 {%   if (zone.masq): %}
 225                 meta nfproto ipv4 {%+ if (zone.masq4_src_pos): -%}
 226                         ip saddr {{ fw4.set(zone.masq4_src_pos) }} {%+ endif -%}
 227                 {%+ if (zone.masq4_src_neg): -%}
 228                         ip saddr != {{ fw4.set(zone.masq4_src_neg) }} {%+ endif -%}
 229                 {%+ if (zone.masq4_dest_pos): -%}
 230                         ip daddr {{ fw4.set(zone.masq4_dest_pos) }} {%+ endif -%}
 231                 {%+ if (zone.masq4_dest_neg): -%}
 232                         ip daddr != {{ fw4.set(zone.masq4_dest_neg) }} {%+ endif -%}
 233                 masquerade comment "!fw4: Masquerade IPv4 {{ zone.name }} traffic"
 234 {%   endif %}
 235 {%   if (zone.masq6): %}
 236                 meta nfproto ipv6 {%+ if (zone.masq6_src_pos): -%}
 237                         ip6 saddr {{ fw4.set(zone.masq6_src_pos) }} {%+ endif -%}
 238                 {%+ if (zone.masq6_src_neg): -%}
 239                         ip6 saddr != {{ fw4.set(zone.masq6_src_neg) }} {%+ endif -%}
 240                 {%+ if (zone.masq6_dest_pos): -%}
 241                         ip6 daddr {{ fw4.set(zone.masq6_dest_pos) }} {%+ endif -%}
 242                 {%+ if (zone.masq6_dest_neg): -%}
 243                         ip6 daddr != {{ fw4.set(zone.masq6_dest_neg) }} {%+ endif -%}
 244                 masquerade comment "!fw4: Masquerade IPv6 {{ zone.name }} traffic"
 245 {%   endif %}
 246         }
 247
 248 {%  endif %}
 249 {% endfor %}
 250
 251         #
 252         # Raw rules (notrack & helper)
 253         #
 254
 255         chain raw_prerouting {
 256                 type filter hook prerouting priority raw; policy accept;
 257 {% for (let target in ["helper", "notrack"]): %}
 258 {%  for (let zone in fw4.zones()): %}
 259 {%   if (zone.dflags[target]): %}
 260 {%    for (let rule in zone.match_rules): %}
 261 {%     let devs = fw4.filter_loopback_devs(rule.devices_pos, false); %}
 262 {%     let nets = fw4.filter_loopback_addrs(rule.subnets_pos, false); %}
 263 {%     if (rule.devices_neg || rule.subnets_neg || length(devs) || length(nets)): %}
 264                 {%+ if (rule.family): -%}
 265                         meta nfproto {{ fw4.nfproto(rule.family) }} {%+ endif -%}
 266                 {%+ if (length(devs)): -%}
 267                         iifname {{ fw4.set(devs) }} {%+ endif -%}
 268                 {%+ if (rule.devices_neg): -%}
 269                         iifname != {{ fw4.set(rule.devices_neg) }} {%+ endif -%}
 270                 {%+ if (length(nets)): -%}
 271                         {{ fw4.ipproto(rule.family) }} saddr {{ fw4.set(nets) }} {%+ endif -%}
 272                 {%+ if (rule.subnets_neg): -%}
 273                         {{ fw4.ipproto(rule.family) }} saddr != {{ fw4.set(rule.subnets_neg) }} {%+ endif -%}
 274                 jump {{ target }}_{{ zone.name }} comment "!fw4: {{ zone.name }} {{ fw4.nfproto(rule.family, true) }} {{
 275                         (target == "helper") ? "CT helper assignment" : "CT bypass"
 276                 }}"
 277 {%     endif %}
 278 {%    endfor %}
 279 {%   endif %}
 280 {%  endfor %}
 281 {% endfor %}
 282         }
 283
 284         chain raw_output {
 285                 type filter hook output priority raw; policy accept;
 286 {% for (let target in ["helper", "notrack"]): %}
 287 {%  for (let zone in fw4.zones()): %}
 288 {%   if (zone.dflags[target]): %}
 289 {%    for (let rule in zone.match_rules): %}
 290 {%     let devs = fw4.filter_loopback_devs(rule.devices_pos, true); %}
 291 {%     let nets = fw4.filter_loopback_addrs(rule.subnets_pos, true); %}
 292 {%     if (length(devs) || length(nets)): %}
 293                 {%+ if (rule.family): -%}
 294                         meta nfproto {{ fw4.nfproto(rule.family) }} {%+ endif -%}
 295                 {%+ if (length(devs)): -%}
 296                         iifname {{ fw4.set(devs) }} {%+ endif -%}
 297                 {%+ if (length(nets)): -%}
 298                         {{ fw4.ipproto(rule.family) }} saddr {{ fw4.set(nets) }} {%+ endif -%}
 299                 jump {{ target }}_{{ zone.name }} comment "!fw4: {{ zone.name }} {{ fw4.nfproto(rule.family, true) }} {{
 300                         (target == "helper") ? "CT helper assignment" : "CT bypass"
 301                 }}"
 302 {%     endif %}
 303 {%    endfor %}
 304 {%   endif %}
 305 {%  endfor %}
 306 {% endfor %}
 307         }
 308
 309 {% for (let helper in fw4.helpers()): %}
 310 {%  if (helper.available): %}
 311 {%   for (let proto in helper.proto): %}
 312         ct helper {{ helper.name }} {
 313                 type {{ fw4.quote(helper.name, true) }} protocol {{ proto.name }};
 314         }
 315
 316 {%   endfor %}
 317 {%  endif %}
 318 {% endfor %}
 319 {% for (let target in ["helper", "notrack"]): %}
 320 {%  for (let zone in fw4.zones()): %}
 321 {%   if (zone.dflags[target]): %}
 322         chain {{ target }}_{{ zone.name }} {
 323 {% for (let rule in fw4.rules(target+"_"+zone.name)): %}
 324                 {%+ include("rule.uc", { fw4, rule }) %}
 325 {% endfor %}
 326         }
 327
 328 {%   endif %}
 329 {%  endfor %}
 330 {% endfor %}
 331
 332         #
 333         # Mangle rules
 334         #
 335
 336         chain mangle_prerouting {
 337                 type filter hook prerouting priority mangle; policy accept;
 338 {% for (let rule in fw4.rules("mangle_prerouting")): %}
 339                 {%+ include("rule.uc", { fw4, rule }) %}
 340 {% endfor %}
 341         }
 342
 343         chain mangle_output {
 344                 type filter hook output priority mangle; policy accept;
 345 {% for (let rule in fw4.rules("mangle_output")): %}
 346                 {%+ include("rule.uc", { fw4, rule }) %}
 347 {% endfor %}
 348         }
 349
 350         chain mangle_forward {
 351                 type filter hook forward priority mangle; policy accept;
 352 {% for (let zone in fw4.zones()): %}
 353 {%  if (zone.mtu_fix): %}
 354 {%   for (let rule in zone.match_rules): %}
 355                 {%+ include("zone-mssfix.uc", { fw4, zone, rule, egress: false }) %}
 356                 {%+ include("zone-mssfix.uc", { fw4, zone, rule, egress: true }) %}
 357 {%   endfor %}
 358 {%  endif %}
 359 {% endfor %}
 360         }
 361 }