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