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