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                 {%+ if (rule.family): -%}
 151                         meta nfproto {{ fw4.nfproto(rule.family) }} {%+ endif -%}
 152                 {%+ include("zone-match.uc", { fw4, egress: false, rule: { ...rule, devices_pos, subnets_pos } }) -%}
 153                 jump helper_{{ zone.name }} comment "!fw4: {{ zone.name }} {{ fw4.nfproto(rule.family, true) }} CT helper assignment"
 154 {%    endif %}
 155 {%   endif %}
 156                 {%+ include("zone-jump.uc", { fw4, zone, rule, direction: "output" }) %}
 157 {%  endfor %}
 158 {% endfor %}
 159 {% if (fw4.output_policy() == "reject"): %}
 160                 jump handle_reject
 161 {% endif %}
 162         }
 163
 164         chain prerouting {
 165                 type filter hook prerouting priority filter; policy accept;
 166 {% for (let zone in fw4.zones()): %}
 167 {%  if (zone.dflags.helper): %}
 168 {%   for (let rule in zone.match_rules): %}
 169 {%    let devices_pos = fw4.filter_loopback_devs(rule.devices_pos, false); %}
 170 {%    let subnets_pos = fw4.filter_loopback_addrs(rule.subnets_pos, false); %}
 171 {%    if (rule.devices_neg || rule.subnets_neg || devices_pos || subnets_pos): %}
 172                 {%+ if (rule.family): -%}
 173                         meta nfproto {{ fw4.nfproto(rule.family) }} {%+ endif -%}
 174                 {%+ include("zone-match.uc", { fw4, egress: false, rule: { ...rule, devices_pos, subnets_pos } }) -%}
 175                 jump helper_{{ zone.name }} comment "!fw4: {{ zone.name }} {{ fw4.nfproto(rule.family, true) }} CT helper assignment"
 176 {%    endif %}
 177 {%   endfor %}
 178 {%  endif %}
 179 {% endfor %}
 180         }
 181
 182         chain handle_reject {
 183                 meta l4proto tcp reject with {{
 184                         (fw4.default_option("tcp_reject_code") != "tcp-reset")
 185                                 ? `icmpx type ${fw4.default_option("tcp_reject_code")}`
 186                                 : "tcp reset"
 187                 }} comment "!fw4: Reject TCP traffic"
 188                 reject with {{
 189                         (fw4.default_option("any_reject_code") != "tcp-reset")
 190                                 ? `icmpx type ${fw4.default_option("any_reject_code")}`
 191                                 : "tcp reset"
 192                 }} comment "!fw4: Reject any other traffic"
 193         }
 194
 195 {% if (fw4.default_option("synflood_protect") && fw4.default_option("synflood_rate")):
 196         let r = fw4.default_option("synflood_rate");
 197         let b = fw4.default_option("synflood_burst");
 198 %}
 199         chain syn_flood {
 200                 limit rate {{ r.rate }}/{{ r.unit }}
 201                 {%- if (b): %} burst {{ b }} packets{% endif %} return comment "!fw4: Accept SYN packets below rate-limit"
 202                 drop comment "!fw4: Drop excess packets"
 203         }
 204
 205 {% endif %}
 206 {% for (let zone in fw4.zones()): %}
 207         chain input_{{ zone.name }} {
 208 {%  for (let rule in fw4.rules(`input_${zone.name}`)): %}
 209                 {%+ include("rule.uc", { fw4, rule }) %}
 210 {%  endfor %}
 211 {%  if (zone.dflags.dnat): %}
 212                 ct status dnat accept comment "!fw4: Accept port redirections"
 213 {%  endif %}
 214                 jump {{ zone.input }}_from_{{ zone.name }}
 215         }
 216
 217         chain output_{{ zone.name }} {
 218 {%  for (let rule in fw4.rules(`output_${zone.name}`)): %}
 219                 {%+ include("rule.uc", { fw4, rule }) %}
 220 {%  endfor %}
 221                 jump {{ zone.output }}_to_{{ zone.name }}
 222         }
 223
 224         chain forward_{{ zone.name }} {
 225 {%  for (let rule in fw4.rules(`forward_${zone.name}`)): %}
 226                 {%+ include("rule.uc", { fw4, rule }) %}
 227 {%  endfor %}
 228 {%  if (zone.dflags.dnat): %}
 229                 ct status dnat accept comment "!fw4: Accept port forwards"
 230 {%  endif %}
 231                 jump {{ zone.forward }}_to_{{ zone.name }}
 232         }
 233
 234 {%  if (zone.dflags.helper): %}
 235         chain helper_{{ zone.name }} {
 236 {%   for (let rule in fw4.rules(`helper_${zone.name}`)): %}
 237                 {%+ include("rule.uc", { fw4, rule }) %}
 238 {%   endfor %}
 239         }
 240
 241 {%  endif %}
 242 {%  for (let verdict in ["accept", "reject", "drop"]): %}
 243 {%   if (zone.sflags[verdict]): %}
 244         chain {{ verdict }}_from_{{ zone.name }} {
 245 {%    for (let rule in zone.match_rules): %}
 246                 {%+ include("zone-verdict.uc", { fw4, zone, rule, egress: false, verdict }) %}
 247 {%    endfor %}
 248         }
 249
 250 {%   endif %}
 251 {%   if (zone.dflags[verdict]): %}
 252         chain {{ verdict }}_to_{{ zone.name }} {
 253 {%   for (let rule in zone.match_rules): %}
 254                 {%+ include("zone-verdict.uc", { fw4, zone, rule, egress: true, verdict }) %}
 255 {%   endfor %}
 256         }
 257
 258 {%   endif %}
 259 {%  endfor %}
 260 {% endfor %}
 261
 262         #
 263         # NAT rules
 264         #
 265
 266         chain dstnat {
 267                 type nat hook prerouting priority dstnat; policy accept;
 268 {% for (let zone in fw4.zones()): %}
 269 {%  if (zone.dflags.dnat): %}
 270 {%   for (let rule in zone.match_rules): %}
 271                 {%+ include("zone-jump.uc", { fw4, zone, rule, direction: "dstnat" }) %}
 272 {%   endfor %}
 273 {%  endif %}
 274 {% endfor %}
 275         }
 276
 277         chain srcnat {
 278                 type nat hook postrouting priority srcnat; policy accept;
 279 {% for (let redirect in fw4.redirects("srcnat")): %}
 280                 {%+ include("redirect.uc", { fw4, redirect }) %}
 281 {% endfor %}
 282 {% for (let zone in fw4.zones()): %}
 283 {%  if (zone.dflags.snat): %}
 284 {%   for (let rule in zone.match_rules): %}
 285                 {%+ include("zone-jump.uc", { fw4, zone, rule, direction: "srcnat" }) %}
 286 {%   endfor %}
 287 {%  endif %}
 288 {% endfor %}
 289         }
 290
 291 {% for (let zone in fw4.zones()): %}
 292 {%  if (zone.dflags.dnat): %}
 293         chain dstnat_{{ zone.name }} {
 294 {%   for (let redirect in fw4.redirects(`dstnat_${zone.name}`)): %}
 295                 {%+ include("redirect.uc", { fw4, redirect }) %}
 296 {%   endfor %}
 297         }
 298
 299 {%  endif %}
 300 {%  if (zone.dflags.snat): %}
 301         chain srcnat_{{ zone.name }} {
 302 {%   for (let redirect in fw4.redirects(`srcnat_${zone.name}`)): %}
 303                 {%+ include("redirect.uc", { fw4, redirect }) %}
 304 {%   endfor %}
 305 {%   if (zone.masq): %}
 306 {%    for (let saddrs in zone.masq4_src_subnets): %}
 307 {%     for (let daddrs in zone.masq4_dest_subnets): %}
 308                 {%+ include("zone-masq.uc", { fw4, zone, family: 4, saddrs, daddrs }) %}
 309 {%     endfor %}
 310 {%    endfor %}
 311 {%   endif %}
 312 {%   if (zone.masq6): %}
 313 {%    for (let saddrs in zone.masq6_src_subnets): %}
 314 {%     for (let daddrs in zone.masq6_dest_subnets): %}
 315                 {%+ include("zone-masq.uc", { fw4, zone, family: 6, saddrs, daddrs }) %}
 316 {%     endfor %}
 317 {%    endfor %}
 318 {%   endif %}
 319         }
 320
 321 {%  endif %}
 322 {% endfor %}
 323
 324         #
 325         # Raw rules (notrack)
 326         #
 327
 328         chain raw_prerouting {
 329                 type filter hook prerouting priority raw; policy accept;
 330 {% for (let zone in fw4.zones()): %}
 331 {%  if (zone.dflags["notrack"]): %}
 332 {%   for (let rule in zone.match_rules): %}
 333 {%    let devices_pos = fw4.filter_loopback_devs(rule.devices_pos, false); %}
 334 {%    let subnets_pos = fw4.filter_loopback_addrs(rule.subnets_pos, false); %}
 335 {%    if (rule.devices_neg || rule.subnets_neg || devices_pos || subnets_pos): %}
 336                 {%+ if (rule.family): -%}
 337                         meta nfproto {{ fw4.nfproto(rule.family) }} {%+ endif -%}
 338                 {%+ include("zone-match.uc", { fw4, egress: false, rule: { ...rule, devices_pos, subnets_pos } }) -%}
 339                 jump notrack_{{ zone.name }} comment "!fw4: {{ zone.name }} {{ fw4.nfproto(rule.family, true) }} CT bypass"
 340 {%    endif %}
 341 {%   endfor %}
 342 {%  endif %}
 343 {% endfor %}
 344         }
 345
 346         chain raw_output {
 347                 type filter hook output priority raw; policy accept;
 348 {% for (let zone in fw4.zones()): %}
 349 {%  if (zone.dflags["notrack"]): %}
 350 {%   for (let rule in zone.match_rules): %}
 351 {%    let devices_pos = fw4.filter_loopback_devs(rule.devices_pos, true); %}
 352 {%    let subnets_pos = fw4.filter_loopback_addrs(rule.subnets_pos, true); %}
 353 {%    if (devices_pos || subnets_pos): %}
 354                 {%+ if (rule.family): -%}
 355                         meta nfproto {{ fw4.nfproto(rule.family) }} {%+ endif -%}
 356                 {%+ include("zone-match.uc", { fw4, egress: false, rule: { ...rule, devices_pos, subnets_pos } }) -%}
 357                 jump notrack_{{ zone.name }} comment "!fw4: {{ zone.name }} {{ fw4.nfproto(rule.family, true) }} CT bypass"
 358 {%    endif %}
 359 {%   endfor %}
 360 {%  endif %}
 361 {% endfor %}
 362         }
 363
 364 {% for (let zone in fw4.zones()): %}
 365 {%   if (zone.dflags.notrack): %}
 366         chain notrack_{{ zone.name }} {
 367 {% for (let rule in fw4.rules(`notrack_${zone.name}`)): %}
 368                 {%+ include("rule.uc", { fw4, rule }) %}
 369 {% endfor %}
 370         }
 371
 372 {%   endif %}
 373 {% endfor %}
 374
 375         #
 376         # Mangle rules
 377         #
 378
 379         chain mangle_prerouting {
 380                 type filter hook prerouting priority mangle; policy accept;
 381 {% for (let rule in fw4.rules("mangle_prerouting")): %}
 382                 {%+ include("rule.uc", { fw4, rule }) %}
 383 {% endfor %}
 384         }
 385
 386         chain mangle_postrouting {
 387                 type filter hook postrouting priority mangle; policy accept;
 388 {% for (let rule in fw4.rules("mangle_postrouting")): %}
 389                 {%+ include("rule.uc", { fw4, rule }) %}
 390 {% endfor %}
 391         }
 392
 393         chain mangle_input {
 394                 type filter hook input priority mangle; policy accept;
 395 {% for (let rule in fw4.rules("mangle_input")): %}
 396                 {%+ include("rule.uc", { fw4, rule }) %}
 397 {% endfor %}
 398         }
 399
 400         chain mangle_output {
 401                 type route hook output priority mangle; policy accept;
 402 {% for (let rule in fw4.rules("mangle_output")): %}
 403                 {%+ include("rule.uc", { fw4, rule }) %}
 404 {% endfor %}
 405         }
 406
 407         chain mangle_forward {
 408                 type filter hook forward priority mangle; policy accept;
 409 {% for (let rule in fw4.rules("mangle_forward")): %}
 410                 {%+ include("rule.uc", { fw4, rule }) %}
 411 {% endfor %}
 412 {% for (let zone in fw4.zones()): %}
 413 {%  if (zone.mtu_fix): %}
 414 {%   for (let rule in zone.match_rules): %}
 415                 {%+ include("zone-mssfix.uc", { fw4, zone, rule, egress: false }) %}
 416                 {%+ include("zone-mssfix.uc", { fw4, zone, rule, egress: true }) %}
 417 {%   endfor %}
 418 {%  endif %}
 419 {% endfor %}
 420         }
 421 }