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