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