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")): %}
  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")):
 142         let r = fw4.default_option("synflood_rate");
 143         let b = fw4.default_option("synflood_burst");
 144 %}
 145         chain syn_flood {
 146                 tcp flags & (fin | syn | rst | ack) == syn
 147                 {%- if (r): %} limit rate {{ r.rate }}/{{ r.unit }}{% endif %}
 148                 {%- if (b): %} burst {{ b }} packets{% endif %} return comment "!fw4: Accept SYN packets below rate-limit"
 149                 drop comment "!fw4: Drop excess packets"
 150         }
 151
 152 {% endif %}
 153 {% for (let zone in fw4.zones()): %}
 154         chain input_{{ zone.name }} {
 155 {%  for (let rule in fw4.rules("input_"+zone.name)): %}
 156                 {%+ include("rule.uc", { fw4, rule }) %}
 157 {%  endfor %}
 158 {%  if (zone.dflags.dnat): %}
 159                 ct status dnat accept comment "!fw4: Accept port redirections"
 160 {%  endif %}
 161                 jump {{ zone.input }}_from_{{ zone.name }}
 162         }
 163
 164         chain output_{{ zone.name }} {
 165 {%  for (let rule in fw4.rules("output_"+zone.name)): %}
 166                 {%+ include("rule.uc", { fw4, rule }) %}
 167 {%  endfor %}
 168                 jump {{ zone.output }}_to_{{ zone.name }}
 169         }
 170
 171         chain forward_{{ zone.name }} {
 172 {%  for (let rule in fw4.rules("forward_"+zone.name)): %}
 173                 {%+ include("rule.uc", { fw4, rule }) %}
 174 {%  endfor %}
 175 {%  if (zone.dflags.dnat): %}
 176                 ct status dnat accept comment "!fw4: Accept port forwards"
 177 {%  endif %}
 178                 jump {{ zone.forward }}_to_{{ zone.name }}
 179         }
 180
 181 {%  for (let verdict in ["accept", "reject", "drop"]): %}
 182 {%   if (zone.sflags[verdict]): %}
 183         chain {{ verdict }}_from_{{ zone.name }} {
 184 {%    for (let rule in zone.match_rules): %}
 185                 {%+ include("zone-verdict.uc", { fw4, zone, rule, egress: false, verdict }) %}
 186 {%    endfor %}
 187         }
 188
 189 {%   endif %}
 190 {%   if (zone.dflags[verdict]): %}
 191         chain {{ verdict }}_to_{{ zone.name }} {
 192 {%   for (let rule in zone.match_rules): %}
 193                 {%+ include("zone-verdict.uc", { fw4, zone, rule, egress: true, verdict }) %}
 194 {%   endfor %}
 195         }
 196
 197 {%   endif %}
 198 {%  endfor %}
 199 {% endfor %}
 200
 201         #
 202         # NAT rules
 203         #
 204
 205         chain dstnat {
 206                 type nat hook prerouting priority dstnat; policy accept;
 207 {% for (let zone in fw4.zones()): %}
 208 {%  if (zone.dflags.dnat): %}
 209 {%   for (let rule in zone.match_rules): %}
 210                 {%+ include("zone-jump.uc", { fw4, zone, rule, direction: "dstnat" }) %}
 211 {%   endfor %}
 212 {%  endif %}
 213 {% endfor %}
 214         }
 215
 216         chain srcnat {
 217                 type nat hook postrouting priority srcnat; policy accept;
 218 {% for (let redirect in fw4.redirects("srcnat")): %}
 219                 {%+ include("redirect.uc", { fw4, redirect }) %}
 220 {% endfor %}
 221 {% for (let zone in fw4.zones()): %}
 222 {%  if (zone.dflags.snat): %}
 223 {%   for (let rule in zone.match_rules): %}
 224                 {%+ include("zone-jump.uc", { fw4, zone, rule, direction: "srcnat" }) %}
 225 {%   endfor %}
 226 {%  endif %}
 227 {% endfor %}
 228         }
 229
 230 {% for (let zone in fw4.zones()): %}
 231 {%  if (zone.dflags.dnat): %}
 232         chain dstnat_{{ zone.name }} {
 233 {% for (let redirect in fw4.redirects("dstnat_"+zone.name)): %}
 234                 {%+ include("redirect.uc", { fw4, redirect }) %}
 235 {% endfor %}
 236         }
 237
 238 {%  endif %}
 239 {%  if (zone.dflags.snat): %}
 240         chain srcnat_{{ zone.name }} {
 241 {% for (let redirect in fw4.redirects("srcnat_"+zone.name)): %}
 242                 {%+ include("redirect.uc", { fw4, redirect }) %}
 243 {% endfor %}
 244 {%   if (zone.masq): %}
 245                 meta nfproto ipv4 {%+ if (zone.masq4_src_pos): -%}
 246                         ip saddr {{ fw4.set(zone.masq4_src_pos) }} {%+ endif -%}
 247                 {%+ if (zone.masq4_src_neg): -%}
 248                         ip saddr != {{ fw4.set(zone.masq4_src_neg) }} {%+ endif -%}
 249                 {%+ if (zone.masq4_dest_pos): -%}
 250                         ip daddr {{ fw4.set(zone.masq4_dest_pos) }} {%+ endif -%}
 251                 {%+ if (zone.masq4_dest_neg): -%}
 252                         ip daddr != {{ fw4.set(zone.masq4_dest_neg) }} {%+ endif -%}
 253                 masquerade comment "!fw4: Masquerade IPv4 {{ zone.name }} traffic"
 254 {%   endif %}
 255 {%   if (zone.masq6): %}
 256                 meta nfproto ipv6 {%+ if (zone.masq6_src_pos): -%}
 257                         ip6 saddr {{ fw4.set(zone.masq6_src_pos) }} {%+ endif -%}
 258                 {%+ if (zone.masq6_src_neg): -%}
 259                         ip6 saddr != {{ fw4.set(zone.masq6_src_neg) }} {%+ endif -%}
 260                 {%+ if (zone.masq6_dest_pos): -%}
 261                         ip6 daddr {{ fw4.set(zone.masq6_dest_pos) }} {%+ endif -%}
 262                 {%+ if (zone.masq6_dest_neg): -%}
 263                         ip6 daddr != {{ fw4.set(zone.masq6_dest_neg) }} {%+ endif -%}
 264                 masquerade comment "!fw4: Masquerade IPv6 {{ zone.name }} traffic"
 265 {%   endif %}
 266         }
 267
 268 {%  endif %}
 269 {% endfor %}
 270
 271         #
 272         # Raw rules (notrack & helper)
 273         #
 274
 275         chain raw_prerouting {
 276                 type filter hook prerouting priority raw; policy accept;
 277 {% for (let target in ["helper", "notrack"]): %}
 278 {%  for (let zone in fw4.zones()): %}
 279 {%   if (zone.dflags[target]): %}
 280 {%    for (let rule in zone.match_rules): %}
 281 {%     let devices_pos = fw4.filter_loopback_devs(rule.devices_pos, false); %}
 282 {%     let subnets_pos = fw4.filter_loopback_addrs(rule.subnets_pos, false); %}
 283 {%     if (rule.devices_neg || rule.subnets_neg || devices_pos || subnets_pos): %}
 284                 {%+ if (rule.family): -%}
 285                         meta nfproto {{ fw4.nfproto(rule.family) }} {%+ endif -%}
 286                 {%+ include("zone-match.uc", { fw4, rule: { ...rule, devices_pos, subnets_pos } }) -%}
 287                 jump {{ target }}_{{ zone.name }} comment "!fw4: {{ zone.name }} {{ fw4.nfproto(rule.family, true) }} {{
 288                         (target == "helper") ? "CT helper assignment" : "CT bypass"
 289                 }}"
 290 {%     endif %}
 291 {%    endfor %}
 292 {%   endif %}
 293 {%  endfor %}
 294 {% endfor %}
 295         }
 296
 297         chain raw_output {
 298                 type filter hook output priority raw; policy accept;
 299 {% for (let target in ["helper", "notrack"]): %}
 300 {%  for (let zone in fw4.zones()): %}
 301 {%   if (zone.dflags[target]): %}
 302 {%    for (let rule in zone.match_rules): %}
 303 {%     let devices_pos = fw4.filter_loopback_devs(rule.devices_pos, true); %}
 304 {%     let subnets_pos = fw4.filter_loopback_addrs(rule.subnets_pos, true); %}
 305 {%     if (devices_pos || subnets_pos): %}
 306                 {%+ if (rule.family): -%}
 307                         meta nfproto {{ fw4.nfproto(rule.family) }} {%+ endif -%}
 308                 {%+ include("zone-match.uc", { fw4, rule: { ...rule, devices_pos, subnets_pos } }) -%}
 309                 jump {{ target }}_{{ zone.name }} comment "!fw4: {{ zone.name }} {{ fw4.nfproto(rule.family, true) }} {{
 310                         (target == "helper") ? "CT helper assignment" : "CT bypass"
 311                 }}"
 312 {%     endif %}
 313 {%    endfor %}
 314 {%   endif %}
 315 {%  endfor %}
 316 {% endfor %}
 317         }
 318
 319 {% for (let helper in fw4.helpers()): %}
 320 {%  if (helper.available): %}
 321 {%   for (let proto in helper.proto): %}
 322         ct helper {{ helper.name }} {
 323                 type {{ fw4.quote(helper.name, true) }} protocol {{ proto.name }};
 324         }
 325
 326 {%   endfor %}
 327 {%  endif %}
 328 {% endfor %}
 329 {% for (let target in ["helper", "notrack"]): %}
 330 {%  for (let zone in fw4.zones()): %}
 331 {%   if (zone.dflags[target]): %}
 332         chain {{ target }}_{{ zone.name }} {
 333 {% for (let rule in fw4.rules(target+"_"+zone.name)): %}
 334                 {%+ include("rule.uc", { fw4, rule }) %}
 335 {% endfor %}
 336         }
 337
 338 {%   endif %}
 339 {%  endfor %}
 340 {% endfor %}
 341
 342         #
 343         # Mangle rules
 344         #
 345
 346         chain mangle_prerouting {
 347                 type filter hook prerouting priority mangle; policy accept;
 348 {% for (let rule in fw4.rules("mangle_prerouting")): %}
 349                 {%+ include("rule.uc", { fw4, rule }) %}
 350 {% endfor %}
 351         }
 352
 353         chain mangle_postrouting {
 354                 type filter hook postrouting priority mangle; policy accept;
 355 {% for (let rule in fw4.rules("mangle_postrouting")): %}
 356                 {%+ include("rule.uc", { fw4, rule }) %}
 357 {% endfor %}
 358         }
 359
 360         chain mangle_input {
 361                 type filter hook input priority mangle; policy accept;
 362 {% for (let rule in fw4.rules("mangle_input")): %}
 363                 {%+ include("rule.uc", { fw4, rule }) %}
 364 {% endfor %}
 365         }
 366
 367         chain mangle_output {
 368                 type filter hook output priority mangle; policy accept;
 369 {% for (let rule in fw4.rules("mangle_output")): %}
 370                 {%+ include("rule.uc", { fw4, rule }) %}
 371 {% endfor %}
 372         }
 373
 374         chain mangle_forward {
 375                 type filter hook forward priority mangle; policy accept;
 376 {% for (let rule in fw4.rules("mangle_forward")): %}
 377                 {%+ include("rule.uc", { fw4, rule }) %}
 378 {% endfor %}
 379 {% for (let zone in fw4.zones()): %}
 380 {%  if (zone.mtu_fix): %}
 381 {%   for (let rule in zone.match_rules): %}
 382                 {%+ include("zone-mssfix.uc", { fw4, zone, rule, egress: false }) %}
 383                 {%+ include("zone-mssfix.uc", { fw4, zone, rule, egress: true }) %}
 384 {%   endfor %}
 385 {%  endif %}
 386 {% endfor %}
 387         }
 388 }