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

   1 {%
   2         let flowtable_devices = fw4.resolve_offload_devices();
   3         let available_helpers = filter(fw4.helpers(), h => h.available);
   4         let defined_ipsets = fw4.ipsets();
   5 -%}
   6
   7 table inet fw4
   8 flush table inet fw4
   9 {% if (fw4.check_flowtable()): %}
  10 delete flowtable inet fw4 ft
  11 {% endif %}
  12 {% fw4.includes('ruleset-prepend') %}
  13
  14 table inet fw4 {
  15 {% if (length(flowtable_devices) > 0): %}
  16         #
  17         # Flowtable
  18         #
  19
  20         flowtable ft {
  21                 hook ingress priority 0;
  22                 devices = {{ fw4.set(flowtable_devices, true) }};
  23                 counter;
  24 {% if (fw4.default_option("flow_offloading_hw")): %}
  25                 flags offload;
  26 {% endif %}
  27         }
  28
  29
  30 {% endif %}
  31 {% if (length(available_helpers)): %}
  32         #
  33         # CT helper definitions
  34         #
  35
  36 {%  for (let helper in available_helpers): %}
  37 {%   for (let proto in helper.proto): %}
  38         ct helper {{ helper.name }} {
  39                 type {{ fw4.quote(helper.name, true) }} protocol {{ proto.name }};
  40         }
  41
  42 {%   endfor %}
  43 {%  endfor %}
  44
  45 {% endif %}
  46 {% if (length(defined_ipsets)): %}
  47         #
  48         # Set definitions
  49         #
  50
  51 {%  for (let set in defined_ipsets): %}
  52         set {{ set.name }} {
  53 {%   if (set.comment): %}
  54                 comment {{ fw4.quote(set.comment, true) }}
  55 {%   endif %}
  56                 type {{ fw4.concat(set.types) }}
  57 {%   if (set.maxelem > 0): %}
  58                 size {{ set.maxelem }}
  59 {%   endif %}
  60 {%   if (set.timeout > 0): %}
  61                 timeout {{ set.timeout }}s
  62 {%   endif %}
  63 {%   if (set.interval): %}
  64                 auto-merge
  65 {%   endif %}
  66 {%   if (set.flags): %}
  67                 flags {{ join(',', set.flags) }}
  68 {%   endif %}
  69 {%   fw4.print_setentries(set) %}
  70         }
  71
  72 {%  endfor %}
  73
  74 {% endif %}
  75         #
  76         # Defines
  77         #
  78
  79 {% for (let zone in fw4.zones()): %}
  80         define {{ replace(zone.name, /^[0-9]/, '_$&') }}_devices = {{ fw4.set(zone.match_devices, true) }}
  81         define {{ replace(zone.name, /^[0-9]/, '_$&') }}_subnets = {{ fw4.set(zone.match_subnets, true) }}
  82
  83 {% endfor %}
  84
  85         #
  86         # User includes
  87         #
  88
  89         include "/etc/nftables.d/*.nft"
  90 {% fw4.includes('table-prepend') %}
  91
  92
  93         #
  94         # Filter rules
  95         #
  96
  97         chain input {
  98                 type filter hook input priority filter; policy {{ fw4.input_policy(true) }};
  99
 100                 iifname "lo" accept comment "!fw4: Accept traffic from loopback"
 101
 102 {% fw4.includes('chain-prepend', 'input') %}
 103                 ct state established,related accept comment "!fw4: Allow inbound established and related flows"
 104 {% if (fw4.default_option("drop_invalid")): %}
 105                 ct state invalid drop comment "!fw4: Drop flows with invalid conntrack state"
 106 {% endif %}
 107 {% if (fw4.default_option("synflood_protect") && fw4.default_option("synflood_rate")): %}
 108                 tcp flags & (fin | syn | rst | ack) == syn jump syn_flood comment "!fw4: Rate limit TCP syn packets"
 109 {% endif %}
 110 {% for (let rule in fw4.rules("input")): %}
 111                 {%+ include("rule.uc", { fw4, rule }) %}
 112 {% endfor %}
 113 {% for (let zone in fw4.zones()): for (let rule in zone.match_rules): %}
 114                 {%+ include("zone-jump.uc", { fw4, zone, rule, direction: "input" }) %}
 115 {% endfor; endfor %}
 116 {% if (fw4.input_policy() == "reject"): %}
 117                 jump handle_reject
 118 {% endif %}
 119 {% fw4.includes('chain-append', 'input') %}
 120         }
 121
 122         chain forward {
 123                 type filter hook forward priority filter; policy {{ fw4.forward_policy(true) }};
 124
 125 {% if (length(flowtable_devices) > 0): %}
 126                 meta l4proto { tcp, udp } flow offload @ft;
 127 {% endif %}
 128 {% fw4.includes('chain-prepend', 'forward') %}
 129                 ct state established,related accept comment "!fw4: Allow forwarded established and related flows"
 130 {% if (fw4.default_option("drop_invalid")): %}
 131                 ct state invalid drop comment "!fw4: Drop flows with invalid conntrack state"
 132 {% endif %}
 133 {% for (let rule in fw4.rules("forward")): %}
 134                 {%+ include("rule.uc", { fw4, rule }) %}
 135 {% endfor %}
 136 {% for (let zone in fw4.zones()): for (let rule in zone.match_rules): %}
 137                 {%+ include("zone-jump.uc", { fw4, zone, rule, direction: "forward" }) %}
 138 {% endfor; endfor %}
 139 {% fw4.includes('chain-append', 'forward') %}
 140 {% if (fw4.forward_policy() == "reject"): %}
 141                 jump handle_reject
 142 {% endif %}
 143         }
 144
 145         chain output {
 146                 type filter hook output priority filter; policy {{ fw4.output_policy(true) }};
 147
 148                 oifname "lo" accept comment "!fw4: Accept traffic towards loopback"
 149
 150 {% fw4.includes('chain-prepend', 'output') %}
 151                 ct state established,related accept comment "!fw4: Allow outbound established and related flows"
 152 {% if (fw4.default_option("drop_invalid")): %}
 153                 ct state invalid drop comment "!fw4: Drop flows with invalid conntrack state"
 154 {% endif %}
 155 {% for (let rule in fw4.rules("output")): %}
 156                 {%+ include("rule.uc", { fw4, rule }) %}
 157 {% endfor %}
 158 {% for (let zone in fw4.zones()): %}
 159 {%  for (let rule in zone.match_rules): %}
 160 {%   if (zone.dflags.helper): %}
 161 {%    let devices_pos = fw4.filter_loopback_devs(rule.devices_pos, true); %}
 162 {%    let subnets_pos = fw4.filter_loopback_addrs(rule.subnets_pos, true); %}
 163 {%    if (devices_pos || subnets_pos): %}
 164                 {%+ include("zone-jump.uc", { fw4, zone, rule: { ...rule, devices_pos, subnets_pos }, direction: "helper" }) %}
 165 {%    endif %}
 166 {%   endif %}
 167                 {%+ include("zone-jump.uc", { fw4, zone, rule, direction: "output" }) %}
 168 {%  endfor %}
 169 {% endfor %}
 170 {% fw4.includes('chain-append', 'output') %}
 171 {% if (fw4.output_policy() == "reject"): %}
 172                 jump handle_reject
 173 {% endif %}
 174         }
 175
 176         chain prerouting {
 177                 type filter hook prerouting priority filter; policy accept;
 178 {% for (let zone in fw4.zones()): %}
 179 {%  if (zone.dflags.helper): %}
 180 {%   for (let rule in zone.match_rules): %}
 181 {%    let devices_pos = fw4.filter_loopback_devs(rule.devices_pos, false); %}
 182 {%    let subnets_pos = fw4.filter_loopback_addrs(rule.subnets_pos, false); %}
 183 {%    if (rule.devices_neg || rule.subnets_neg || devices_pos || subnets_pos): %}
 184                 {%+ include("zone-jump.uc", { fw4, zone, rule: { ...rule, devices_pos, subnets_pos }, direction: "helper" }) %}
 185 {%    endif %}
 186 {%   endfor %}
 187 {%  endif %}
 188 {% endfor %}
 189         }
 190
 191         chain handle_reject {
 192                 meta l4proto tcp reject with {{
 193                         (fw4.default_option("tcp_reject_code") != "tcp-reset")
 194                                 ? `icmpx type ${fw4.default_option("tcp_reject_code")}`
 195                                 : "tcp reset"
 196                 }} comment "!fw4: Reject TCP traffic"
 197                 reject with {{
 198                         (fw4.default_option("any_reject_code") != "tcp-reset")
 199                                 ? `icmpx type ${fw4.default_option("any_reject_code")}`
 200                                 : "tcp reset"
 201                 }} comment "!fw4: Reject any other traffic"
 202         }
 203
 204 {% if (fw4.default_option("synflood_protect") && fw4.default_option("synflood_rate")):
 205         let r = fw4.default_option("synflood_rate");
 206         let b = fw4.default_option("synflood_burst");
 207 %}
 208         chain syn_flood {
 209                 limit rate {{ r.rate }}/{{ r.unit }}
 210                 {%- if (b): %} burst {{ b }} packets{% endif %} return comment "!fw4: Accept SYN packets below rate-limit"
 211                 drop comment "!fw4: Drop excess packets"
 212         }
 213
 214 {% endif %}
 215 {% for (let zone in fw4.zones()): %}
 216         chain input_{{ zone.name }} {
 217 {%  fw4.includes('chain-prepend', `input_${zone.name}`) %}
 218 {%  for (let rule in fw4.rules(`input_${zone.name}`)): %}
 219                 {%+ include("rule.uc", { fw4, rule }) %}
 220 {%  endfor %}
 221 {%  if (zone.dflags.dnat): %}
 222                 ct status dnat accept comment "!fw4: Accept port redirections"
 223 {%  endif %}
 224 {%  fw4.includes('chain-append', `input_${zone.name}`) %}
 225                 jump {{ zone.input }}_from_{{ zone.name }}
 226         }
 227
 228         chain output_{{ zone.name }} {
 229 {%  fw4.includes('chain-prepend', `output_${zone.name}`) %}
 230 {%  for (let rule in fw4.rules(`output_${zone.name}`)): %}
 231                 {%+ include("rule.uc", { fw4, rule }) %}
 232 {%  endfor %}
 233 {%  fw4.includes('chain-append', `output_${zone.name}`) %}
 234                 jump {{ zone.output }}_to_{{ zone.name }}
 235         }
 236
 237         chain forward_{{ zone.name }} {
 238 {%  fw4.includes('chain-prepend', `forward_${zone.name}`) %}
 239 {%  for (let rule in fw4.rules(`forward_${zone.name}`)): %}
 240                 {%+ include("rule.uc", { fw4, rule }) %}
 241 {%  endfor %}
 242 {%  if (zone.dflags.dnat): %}
 243                 ct status dnat accept comment "!fw4: Accept port forwards"
 244 {%  endif %}
 245 {%  fw4.includes('chain-append', `forward_${zone.name}`) %}
 246                 jump {{ zone.forward }}_to_{{ zone.name }}
 247 {%  if (fw4.forward_policy() != "accept" && (zone.log & 1)): %}
 248                 log prefix "{{ fw4.forward_policy() }} {{ zone.name }} forward: "
 249 {%  endif %}
 250         }
 251
 252 {%  if (zone.dflags.helper): %}
 253         chain helper_{{ zone.name }} {
 254 {%   for (let rule in fw4.rules(`helper_${zone.name}`)): %}
 255                 {%+ include("rule.uc", { fw4, rule }) %}
 256 {%   endfor %}
 257         }
 258
 259 {%  endif %}
 260 {%  for (let verdict in ["accept", "reject", "drop"]): %}
 261 {%   if (zone.sflags[verdict]): %}
 262         chain {{ verdict }}_from_{{ zone.name }} {
 263 {%    for (let rule in zone.match_rules): %}
 264                 {%+ include("zone-verdict.uc", { fw4, zone, rule, egress: false, verdict }) %}
 265 {%    endfor %}
 266         }
 267
 268 {%   endif %}
 269 {%   if (zone.dflags[verdict]): %}
 270         chain {{ verdict }}_to_{{ zone.name }} {
 271 {%   for (let rule in zone.match_rules): %}
 272 {%     if (verdict == "accept" && (zone.masq || zone.masq6) && !zone.masq_allow_invalid): %}
 273                 {%+ include("zone-drop-invalid.uc", { fw4, zone, rule }) %}
 274 {%     endif %}
 275                 {%+ include("zone-verdict.uc", { fw4, zone, rule, egress: true, verdict }) %}
 276 {%   endfor %}
 277         }
 278
 279 {%   endif %}
 280 {%  endfor %}
 281 {% endfor %}
 282
 283         #
 284         # NAT rules
 285         #
 286
 287         chain dstnat {
 288                 type nat hook prerouting priority dstnat; policy accept;
 289 {% fw4.includes('chain-prepend', 'dstnat') %}
 290 {% for (let zone in fw4.zones()): %}
 291 {%  if (zone.dflags.dnat): %}
 292 {%   for (let rule in zone.match_rules): %}
 293                 {%+ include("zone-jump.uc", { fw4, zone, rule, direction: "dstnat" }) %}
 294 {%   endfor %}
 295 {%  endif %}
 296 {% endfor %}
 297 {% fw4.includes('chain-append', 'dstnat') %}
 298         }
 299
 300         chain srcnat {
 301                 type nat hook postrouting priority srcnat; policy accept;
 302 {% fw4.includes('chain-prepend', 'srcnat') %}
 303 {% for (let redirect in fw4.redirects("srcnat")): %}
 304                 {%+ include("redirect.uc", { fw4, redirect }) %}
 305 {% endfor %}
 306 {% for (let zone in fw4.zones()): %}
 307 {%  if (zone.dflags.snat): %}
 308 {%   for (let rule in zone.match_rules): %}
 309                 {%+ include("zone-jump.uc", { fw4, zone, rule, direction: "srcnat" }) %}
 310 {%   endfor %}
 311 {%  endif %}
 312 {% endfor %}
 313 {% fw4.includes('chain-append', 'srcnat') %}
 314         }
 315
 316 {% for (let zone in fw4.zones()): %}
 317 {%  if (zone.dflags.dnat): %}
 318         chain dstnat_{{ zone.name }} {
 319 {%   fw4.includes('chain-prepend', `dstnat_${zone.name}`) %}
 320 {%   for (let redirect in fw4.redirects(`dstnat_${zone.name}`)): %}
 321                 {%+ include("redirect.uc", { fw4, redirect }) %}
 322 {%   endfor %}
 323 {%   fw4.includes('chain-append', `dstnat_${zone.name}`) %}
 324         }
 325
 326 {%  endif %}
 327 {%  if (zone.dflags.snat): %}
 328         chain srcnat_{{ zone.name }} {
 329 {%   fw4.includes('chain-prepend', `srcnat_${zone.name}`) %}
 330 {%   for (let redirect in fw4.redirects(`srcnat_${zone.name}`)): %}
 331                 {%+ include("redirect.uc", { fw4, redirect }) %}
 332 {%   endfor %}
 333 {%   if (zone.masq): %}
 334 {%    for (let saddrs in zone.masq4_src_subnets): %}
 335 {%     for (let daddrs in zone.masq4_dest_subnets): %}
 336                 {%+ include("zone-masq.uc", { fw4, zone, family: 4, saddrs, daddrs }) %}
 337 {%     endfor %}
 338 {%    endfor %}
 339 {%   endif %}
 340 {%   if (zone.masq6): %}
 341 {%    for (let saddrs in zone.masq6_src_subnets): %}
 342 {%     for (let daddrs in zone.masq6_dest_subnets): %}
 343                 {%+ include("zone-masq.uc", { fw4, zone, family: 6, saddrs, daddrs }) %}
 344 {%     endfor %}
 345 {%    endfor %}
 346 {%   endif %}
 347 {%   fw4.includes('chain-append', `srcnat_${zone.name}`) %}
 348         }
 349
 350 {%  endif %}
 351 {% endfor %}
 352
 353         #
 354         # Raw rules (notrack)
 355         #
 356
 357         chain raw_prerouting {
 358                 type filter hook prerouting priority raw; policy accept;
 359 {% for (let zone in fw4.zones()): %}
 360 {%  if (zone.dflags["notrack"]): %}
 361 {%   for (let rule in zone.match_rules): %}
 362 {%    let devices_pos = fw4.filter_loopback_devs(rule.devices_pos, false); %}
 363 {%    let subnets_pos = fw4.filter_loopback_addrs(rule.subnets_pos, false); %}
 364 {%    if (rule.devices_neg || rule.subnets_neg || devices_pos || subnets_pos): %}
 365                 {%+ include("zone-jump.uc", { fw4, zone, rule: { ...rule, devices_pos, subnets_pos }, direction: "notrack" }) %}
 366 {%    endif %}
 367 {%   endfor %}
 368 {%  endif %}
 369 {% endfor %}
 370 {% fw4.includes('chain-append', 'raw_prerouting') %}
 371         }
 372
 373         chain raw_output {
 374                 type filter hook output priority raw; policy accept;
 375 {% fw4.includes('chain-prepend', 'raw_output') %}
 376 {% for (let zone in fw4.zones()): %}
 377 {%  if (zone.dflags["notrack"]): %}
 378 {%   for (let rule in zone.match_rules): %}
 379 {%    let devices_pos = fw4.filter_loopback_devs(rule.devices_pos, true); %}
 380 {%    let subnets_pos = fw4.filter_loopback_addrs(rule.subnets_pos, true); %}
 381 {%    if (devices_pos || subnets_pos): %}
 382                 {%+ include("zone-jump.uc", { fw4, zone, rule: { ...rule, devices_pos, subnets_pos }, direction: "notrack" }) %}
 383 {%    endif %}
 384 {%   endfor %}
 385 {%  endif %}
 386 {% endfor %}
 387 {% fw4.includes('chain-append', 'raw_output') %}
 388         }
 389
 390 {% for (let zone in fw4.zones()): %}
 391 {%   if (zone.dflags.notrack): %}
 392         chain notrack_{{ zone.name }} {
 393 {% for (let rule in fw4.rules(`notrack_${zone.name}`)): %}
 394                 {%+ include("rule.uc", { fw4, rule }) %}
 395 {% endfor %}
 396         }
 397
 398 {%   endif %}
 399 {% endfor %}
 400
 401         #
 402         # Mangle rules
 403         #
 404
 405         chain mangle_prerouting {
 406                 type filter hook prerouting priority mangle; policy accept;
 407 {% fw4.includes('chain-prepend', 'mangle_prerouting') %}
 408 {% for (let rule in fw4.rules("mangle_prerouting")): %}
 409                 {%+ include("rule.uc", { fw4, rule }) %}
 410 {% endfor %}
 411 {% fw4.includes('chain-append', 'mangle_prerouting') %}
 412         }
 413
 414         chain mangle_postrouting {
 415                 type filter hook postrouting priority mangle; policy accept;
 416 {% fw4.includes('chain-prepend', 'mangle_postrouting') %}
 417 {% for (let rule in fw4.rules("mangle_postrouting")): %}
 418                 {%+ include("rule.uc", { fw4, rule }) %}
 419 {% endfor %}
 420 {% fw4.includes('chain-append', 'mangle_postrouting') %}
 421         }
 422
 423         chain mangle_input {
 424                 type filter hook input priority mangle; policy accept;
 425 {% fw4.includes('chain-prepend', 'mangle_input') %}
 426 {% for (let rule in fw4.rules("mangle_input")): %}
 427                 {%+ include("rule.uc", { fw4, rule }) %}
 428 {% endfor %}
 429 {% fw4.includes('chain-append', 'mangle_input') %}
 430         }
 431
 432         chain mangle_output {
 433                 type route hook output priority mangle; policy accept;
 434 {% fw4.includes('chain-prepend', 'mangle_output') %}
 435 {% for (let rule in fw4.rules("mangle_output")): %}
 436                 {%+ include("rule.uc", { fw4, rule }) %}
 437 {% endfor %}
 438 {% fw4.includes('chain-append', 'mangle_output') %}
 439         }
 440
 441         chain mangle_forward {
 442                 type filter hook forward priority mangle; policy accept;
 443 {% fw4.includes('chain-prepend', 'mangle_forward') %}
 444 {% for (let rule in fw4.rules("mangle_forward")): %}
 445                 {%+ include("rule.uc", { fw4, rule }) %}
 446 {% endfor %}
 447 {% for (let zone in fw4.zones()): %}
 448 {%  if (zone.mtu_fix): %}
 449 {%   for (let rule in zone.match_rules): %}
 450                 {%+ include("zone-mssfix.uc", { fw4, zone, rule, egress: false }) %}
 451                 {%+ include("zone-mssfix.uc", { fw4, zone, rule, egress: true }) %}
 452 {%   endfor %}
 453 {%  endif %}
 454 {% endfor %}
 455 {% fw4.includes('chain-append', 'mangle_forward') %}
 456         }
 457 {% fw4.includes('table-append') %}
 458 }
 459 {% fw4.includes('ruleset-append') %}