root/usr/share/firewall4/templates/ruleset.uc

   1 {% let flowtable_devices = fw4.resolve_offload_devices(); -%}
   2
   3 table inet fw4
   4 flush table inet fw4
   5 {% if (fw4.check_flowtable()): %}
   6 delete flowtable inet fw4 ft
   7 {% endif %}
   8
   9 table inet fw4 {
  10 {% if (length(flowtable_devices) > 0): %}
  11         #
  12         # Flowtable
  13         #
  14
  15         flowtable ft {
  16                 hook ingress priority 0;
  17                 devices = {{ fw4.set(flowtable_devices, true) }};
  18 {% if (fw4.default_option("flow_offloading_hw")): %}
  19                 flags offload;
  20 {% endif %}
  21         }
  22
  23 {% endif %}
  24         #
  25         # Set definitions
  26         #
  27
  28 {% for (let set in fw4.ipsets()): %}
  29         set {{ set.name }} {
  30                 type {{ fw4.concat(set.types) }}
  31 {%  if (set.maxelem > 0): %}
  32                 size {{ set.maxelem }}
  33 {%  endif %}
  34 {%  if (set.timeout >= 0): %}
  35                 timeout {{ set.timeout }}s
  36 {% endif %}
  37 {%  if (set.interval): %}
  38                 flags interval
  39                 auto-merge
  40 {%  endif %}
  41 {%  fw4.print_setentries(set) %}
  42         }
  43
  44 {% endfor %}
  45
  46         #
  47         # Defines
  48         #
  49
  50 {% for (let zone in fw4.zones()): %}
  51 {%  if (length(zone.match_devices)): %}
  52         define {{ zone.name }}_devices = {{ fw4.set(zone.match_devices, true) }}
  53 {%  endif %}
  54 {%  if (length(zone.match_subnets)): %}
  55         define {{ zone.name }}_subnets = {{ fw4.set(zone.match_subnets, true) }}
  56 {%  endif %}
  57 {% endfor %}
  58
  59         #
  60         # User includes
  61         #
  62
  63         include "/etc/nftables.d/*.nft"
  64
  65
  66         #
  67         # Filter rules
  68         #
  69
  70         chain input {
  71                 type filter hook input priority filter; policy {{ fw4.input_policy(true) }};
  72
  73                 iifname "lo" accept comment "!fw4: Accept traffic from loopback"
  74
  75                 ct state established,related accept comment "!fw4: Allow inbound established and related flows"
  76 {% if (fw4.default_option("drop_invalid")): %}
  77                 ct state invalid drop comment "!fw4: Drop flows with invalid conntrack state"
  78 {% endif %}
  79 {% if (fw4.default_option("synflood_protect") && fw4.default_option("synflood_rate")): %}
  80                 tcp flags & (fin | syn | rst | ack) == syn jump syn_flood comment "!fw4: Rate limit TCP syn packets"
  81 {% endif %}
  82 {% for (let rule in fw4.rules("input")): %}
  83                 {%+ include("rule.uc", { fw4, rule }) %}
  84 {% endfor %}
  85 {% for (let zone in fw4.zones()): for (let rule in zone.match_rules): %}
  86                 {%+ include("zone-jump.uc", { fw4, zone, rule, direction: "input" }) %}
  87 {% endfor; endfor %}
  88 {% if (fw4.input_policy() == "reject"): %}
  89                 jump handle_reject
  90 {% endif %}
  91         }
  92
  93         chain forward {
  94                 type filter hook forward priority filter; policy {{ fw4.forward_policy(true) }};
  95
  96 {% if (length(flowtable_devices) > 0): %}
  97                 meta l4proto { tcp, udp } flow offload @ft;
  98 {% endif %}
  99                 ct state established,related accept comment "!fw4: Allow forwarded 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 {% for (let rule in fw4.rules("forward")): %}
 104                 {%+ include("rule.uc", { fw4, rule }) %}
 105 {% endfor %}
 106 {% for (let zone in fw4.zones()): for (let rule in zone.match_rules): %}
 107                 {%+ include("zone-jump.uc", { fw4, zone, rule, direction: "forward" }) %}
 108 {% endfor; endfor %}
 109 {% if (fw4.forward_policy() == "reject"): %}
 110                 jump handle_reject
 111 {% endif %}
 112         }
 113
 114         chain output {
 115                 type filter hook output priority filter; policy {{ fw4.output_policy(true) }};
 116
 117                 oifname "lo" accept comment "!fw4: Accept traffic towards loopback"
 118
 119                 ct state established,related accept comment "!fw4: Allow outbound established and related flows"
 120 {% if (fw4.default_option("drop_invalid")): %}
 121                 ct state invalid drop comment "!fw4: Drop flows with invalid conntrack state"
 122 {% endif %}
 123 {% for (let rule in fw4.rules("output")): %}
 124                 {%+ include("rule.uc", { fw4, rule }) %}
 125 {% endfor %}
 126 {% for (let zone in fw4.zones()): for (let rule in zone.match_rules): %}
 127                 {%+ include("zone-jump.uc", { fw4, zone, rule, direction: "output" }) %}
 128 {% endfor; endfor %}
 129 {% if (fw4.output_policy() == "reject"): %}
 130                 jump handle_reject
 131 {% endif %}
 132         }
 133
 134         chain handle_reject {
 135                 meta l4proto tcp reject with {{
 136                         (fw4.default_option("tcp_reject_code") != "tcp-reset")
 137                                 ? `icmpx type ${fw4.default_option("tcp_reject_code")}`
 138                                 : "tcp reset"
 139                 }} comment "!fw4: Reject TCP traffic"
 140                 reject with {{
 141                         (fw4.default_option("any_reject_code") != "tcp-reset")
 142                                 ? `icmpx type ${fw4.default_option("any_reject_code")}`
 143                                 : "tcp reset"
 144                 }} comment "!fw4: Reject any other traffic"
 145         }
 146
 147 {% if (fw4.default_option("synflood_protect") && fw4.default_option("synflood_rate")):
 148         let r = fw4.default_option("synflood_rate");
 149         let b = fw4.default_option("synflood_burst");
 150 %}
 151         chain syn_flood {
 152                 limit rate {{ r.rate }}/{{ r.unit }}
 153                 {%- if (b): %} burst {{ b }} packets{% endif %} return comment "!fw4: Accept SYN packets below rate-limit"
 154                 drop comment "!fw4: Drop excess packets"
 155         }
 156
 157 {% endif %}
 158 {% for (let zone in fw4.zones()): %}
 159         chain input_{{ zone.name }} {
 160 {%  for (let rule in fw4.rules(`input_${zone.name}`)): %}
 161                 {%+ include("rule.uc", { fw4, rule }) %}
 162 {%  endfor %}
 163 {%  if (zone.dflags.dnat): %}
 164                 ct status dnat accept comment "!fw4: Accept port redirections"
 165 {%  endif %}
 166                 jump {{ zone.input }}_from_{{ zone.name }}
 167         }
 168
 169         chain output_{{ zone.name }} {
 170 {%  for (let rule in fw4.rules(`output_${zone.name}`)): %}
 171                 {%+ include("rule.uc", { fw4, rule }) %}
 172 {%  endfor %}
 173                 jump {{ zone.output }}_to_{{ zone.name }}
 174         }
 175
 176         chain forward_{{ zone.name }} {
 177 {%  for (let rule in fw4.rules(`forward_${zone.name}`)): %}
 178                 {%+ include("rule.uc", { fw4, rule }) %}
 179 {%  endfor %}
 180 {%  if (zone.dflags.dnat): %}
 181                 ct status dnat accept comment "!fw4: Accept port forwards"
 182 {%  endif %}
 183                 jump {{ zone.forward }}_to_{{ zone.name }}
 184         }
 185
 186 {%  for (let verdict in ["accept", "reject", "drop"]): %}
 187 {%   if (zone.sflags[verdict]): %}
 188         chain {{ verdict }}_from_{{ zone.name }} {
 189 {%    for (let rule in zone.match_rules): %}
 190                 {%+ include("zone-verdict.uc", { fw4, zone, rule, egress: false, verdict }) %}
 191 {%    endfor %}
 192         }
 193
 194 {%   endif %}
 195 {%   if (zone.dflags[verdict]): %}
 196         chain {{ verdict }}_to_{{ zone.name }} {
 197 {%   for (let rule in zone.match_rules): %}
 198                 {%+ include("zone-verdict.uc", { fw4, zone, rule, egress: true, verdict }) %}
 199 {%   endfor %}
 200         }
 201
 202 {%   endif %}
 203 {%  endfor %}
 204 {% endfor %}
 205
 206         #
 207         # NAT rules
 208         #
 209
 210         chain dstnat {
 211                 type nat hook prerouting priority dstnat; policy accept;
 212 {% for (let zone in fw4.zones()): %}
 213 {%  if (zone.dflags.dnat): %}
 214 {%   for (let rule in zone.match_rules): %}
 215                 {%+ include("zone-jump.uc", { fw4, zone, rule, direction: "dstnat" }) %}
 216 {%   endfor %}
 217 {%  endif %}
 218 {% endfor %}
 219         }
 220
 221         chain srcnat {
 222                 type nat hook postrouting priority srcnat; policy accept;
 223 {% for (let redirect in fw4.redirects("srcnat")): %}
 224                 {%+ include("redirect.uc", { fw4, redirect }) %}
 225 {% endfor %}
 226 {% for (let zone in fw4.zones()): %}
 227 {%  if (zone.dflags.snat): %}
 228 {%   for (let rule in zone.match_rules): %}
 229                 {%+ include("zone-jump.uc", { fw4, zone, rule, direction: "srcnat" }) %}
 230 {%   endfor %}
 231 {%  endif %}
 232 {% endfor %}
 233         }
 234
 235 {% for (let zone in fw4.zones()): %}
 236 {%  if (zone.dflags.dnat): %}
 237         chain dstnat_{{ zone.name }} {
 238 {%   for (let redirect in fw4.redirects(`dstnat_${zone.name}`)): %}
 239                 {%+ include("redirect.uc", { fw4, redirect }) %}
 240 {%   endfor %}
 241         }
 242
 243 {%  endif %}
 244 {%  if (zone.dflags.snat): %}
 245         chain srcnat_{{ zone.name }} {
 246 {%   for (let redirect in fw4.redirects(`srcnat_${zone.name}`)): %}
 247                 {%+ include("redirect.uc", { fw4, redirect }) %}
 248 {%   endfor %}
 249 {%   if (zone.masq): %}
 250 {%    for (let saddrs in zone.masq4_src_subnets): %}
 251 {%     for (let daddrs in zone.masq4_dest_subnets): %}
 252                 {%+ include("zone-masq.uc", { fw4, zone, family: 4, saddrs, daddrs }) %}
 253 {%     endfor %}
 254 {%    endfor %}
 255 {%   endif %}
 256 {%   if (zone.masq6): %}
 257 {%    for (let saddrs in zone.masq6_src_subnets): %}
 258 {%     for (let daddrs in zone.masq6_dest_subnets): %}
 259                 {%+ include("zone-masq.uc", { fw4, zone, family: 6, saddrs, daddrs }) %}
 260 {%     endfor %}
 261 {%    endfor %}
 262 {%   endif %}
 263         }
 264
 265 {%  endif %}
 266 {% endfor %}
 267
 268         #
 269         # Raw rules (notrack & helper)
 270         #
 271
 272         chain raw_prerouting {
 273                 type filter hook prerouting priority raw; policy accept;
 274 {% for (let target in ["helper", "notrack"]): %}
 275 {%  for (let zone in fw4.zones()): %}
 276 {%   if (zone.dflags[target]): %}
 277 {%    for (let rule in zone.match_rules): %}
 278 {%     let devices_pos = fw4.filter_loopback_devs(rule.devices_pos, false); %}
 279 {%     let subnets_pos = fw4.filter_loopback_addrs(rule.subnets_pos, false); %}
 280 {%     if (rule.devices_neg || rule.subnets_neg || devices_pos || subnets_pos): %}
 281                 {%+ if (rule.family): -%}
 282                         meta nfproto {{ fw4.nfproto(rule.family) }} {%+ endif -%}
 283                 {%+ include("zone-match.uc", { fw4, egress: false, rule: { ...rule, devices_pos, subnets_pos } }) -%}
 284                 jump {{ target }}_{{ zone.name }} comment "!fw4: {{ zone.name }} {{ fw4.nfproto(rule.family, true) }} {{
 285                         (target == "helper") ? "CT helper assignment" : "CT bypass"
 286                 }}"
 287 {%     endif %}
 288 {%    endfor %}
 289 {%   endif %}
 290 {%  endfor %}
 291 {% endfor %}
 292         }
 293
 294         chain raw_output {
 295                 type filter hook output priority raw; policy accept;
 296 {% for (let target in ["helper", "notrack"]): %}
 297 {%  for (let zone in fw4.zones()): %}
 298 {%   if (zone.dflags[target]): %}
 299 {%    for (let rule in zone.match_rules): %}
 300 {%     let devices_pos = fw4.filter_loopback_devs(rule.devices_pos, true); %}
 301 {%     let subnets_pos = fw4.filter_loopback_addrs(rule.subnets_pos, true); %}
 302 {%     if (devices_pos || subnets_pos): %}
 303                 {%+ if (rule.family): -%}
 304                         meta nfproto {{ fw4.nfproto(rule.family) }} {%+ endif -%}
 305                 {%+ include("zone-match.uc", { fw4, egress: false, rule: { ...rule, devices_pos, subnets_pos } }) -%}
 306                 jump {{ target }}_{{ zone.name }} comment "!fw4: {{ zone.name }} {{ fw4.nfproto(rule.family, true) }} {{
 307                         (target == "helper") ? "CT helper assignment" : "CT bypass"
 308                 }}"
 309 {%     endif %}
 310 {%    endfor %}
 311 {%   endif %}
 312 {%  endfor %}
 313 {% endfor %}
 314         }
 315
 316 {% for (let helper in fw4.helpers()): %}
 317 {%  if (helper.available): %}
 318 {%   for (let proto in helper.proto): %}
 319         ct helper {{ helper.name }} {
 320                 type {{ fw4.quote(helper.name, true) }} protocol {{ proto.name }};
 321         }
 322
 323 {%   endfor %}
 324 {%  endif %}
 325 {% endfor %}
 326 {% for (let target in ["helper", "notrack"]): %}
 327 {%  for (let zone in fw4.zones()): %}
 328 {%   if (zone.dflags[target]): %}
 329         chain {{ target }}_{{ zone.name }} {
 330 {% for (let rule in fw4.rules(`${target}_${zone.name}`)): %}
 331                 {%+ include("rule.uc", { fw4, rule }) %}
 332 {% endfor %}
 333         }
 334
 335 {%   endif %}
 336 {%  endfor %}
 337 {% endfor %}
 338
 339         #
 340         # Mangle rules
 341         #
 342
 343         chain mangle_prerouting {
 344                 type filter hook prerouting priority mangle; policy accept;
 345 {% for (let rule in fw4.rules("mangle_prerouting")): %}
 346                 {%+ include("rule.uc", { fw4, rule }) %}
 347 {% endfor %}
 348         }
 349
 350         chain mangle_postrouting {
 351                 type filter hook postrouting priority mangle; policy accept;
 352 {% for (let rule in fw4.rules("mangle_postrouting")): %}
 353                 {%+ include("rule.uc", { fw4, rule }) %}
 354 {% endfor %}
 355         }
 356
 357         chain mangle_input {
 358                 type filter hook input priority mangle; policy accept;
 359 {% for (let rule in fw4.rules("mangle_input")): %}
 360                 {%+ include("rule.uc", { fw4, rule }) %}
 361 {% endfor %}
 362         }
 363
 364         chain mangle_output {
 365                 type route hook output priority mangle; policy accept;
 366 {% for (let rule in fw4.rules("mangle_output")): %}
 367                 {%+ include("rule.uc", { fw4, rule }) %}
 368 {% endfor %}
 369         }
 370
 371         chain mangle_forward {
 372                 type filter hook forward priority mangle; policy accept;
 373 {% for (let rule in fw4.rules("mangle_forward")): %}
 374                 {%+ include("rule.uc", { fw4, rule }) %}
 375 {% endfor %}
 376 {% for (let zone in fw4.zones()): %}
 377 {%  if (zone.mtu_fix): %}
 378 {%   for (let rule in zone.match_rules): %}
 379                 {%+ include("zone-mssfix.uc", { fw4, zone, rule, egress: false }) %}
 380                 {%+ include("zone-mssfix.uc", { fw4, zone, rule, egress: true }) %}
 381 {%   endfor %}
 382 {%  endif %}
 383 {% endfor %}
 384         }
 385 }