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

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