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         #
  21         # Set definitions
  22         #
  23
  24 {% for (let set in fw4.ipsets()): %}
  25         set {{ set.name }} {
  26                 type {{ fw4.concat(set.types) }}
  27 {%  if (set.maxelem > 0): %}
  28                 size {{ set.maxelem }}
  29 {%  endif %}
  30 {%  if (set.timeout >= 0): %}
  31                 timeout {{ set.timeout }}s
  32 {% endif %}
  33 {%  if (set.interval): %}
  34                 flags interval
  35 {%  endif %}
  36 {%  fw4.print_setentries(set) %}
  37         }
  38
  39 {% endfor %}
  40
  41         #
  42         # Defines
  43         #
  44
  45 {% for (let zone in fw4.zones()): %}
  46 {%  if (length(zone.match_devices)): %}
  47         define {{ zone.name }}_devices = {{ fw4.set(zone.match_devices, true) }}
  48 {%  endif %}
  49 {%  if (length(zone.match_subnets)): %}
  50         define {{ zone.name }}_subnets = {{ fw4.set(zone.match_subnets, true) }}
  51 {%  endif %}
  52 {% endfor %}
  53
  54         #
  55         # User includes
  56         #
  57
  58         include "/etc/nftables.d/*.nft"
  59
  60
  61         #
  62         # Filter rules
  63         #
  64
  65         chain input {
  66                 type filter hook input priority filter; policy {{ fw4.input_policy(true) }};
  67
  68                 iifname "lo" accept comment "!fw4: Accept traffic from loopback"
  69
  70                 ct state established,related accept comment "!fw4: Allow inbound established and related flows"
  71 {% if (fw4.default_option("drop_invalid")): %}
  72                 ct state invalid drop comment "!fw4: Drop flows with invalid conntrack state"
  73 {% endif %}
  74 {% if (fw4.default_option("synflood_protect")): %}
  75                 tcp flags & (fin | syn | rst | ack) == syn jump syn_flood comment "!fw4: Rate limit TCP syn packets"
  76 {% endif %}
  77 {% for (let rule in fw4.rules("input")): %}
  78                 {%+ include("rule.uc", { fw4, rule }) %}
  79 {% endfor %}
  80 {% for (let zone in fw4.zones()): for (let rule in zone.match_rules): %}
  81                 {%+ include("zone-match.uc", { fw4, zone, rule, direction: "input" }) %}
  82 {% endfor; endfor %}
  83 {% if (fw4.input_policy() == "reject"): %}
  84                 jump handle_reject
  85 {% endif %}
  86         }
  87
  88         chain forward {
  89                 type filter hook forward priority filter; policy {{ fw4.forward_policy(true) }};
  90
  91 {% if (fw4.default_option("flow_offloading") && length(devices) > 0): %}
  92                 meta l4proto { tcp, udp } flow offload @ft;
  93 {% endif %}
  94                 ct state established,related accept comment "!fw4: Allow forwarded 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 {% for (let rule in fw4.rules("forward")): %}
  99                 {%+ include("rule.uc", { fw4, rule }) %}
 100 {% endfor %}
 101 {% for (let zone in fw4.zones()): for (let rule in zone.match_rules): %}
 102                 {%+ include("zone-match.uc", { fw4, zone, rule, direction: "forward" }) %}
 103 {% endfor; endfor %}
 104 {% if (fw4.forward_policy() == "reject"): %}
 105                 jump handle_reject
 106 {% endif %}
 107         }
 108
 109         chain output {
 110                 type filter hook output priority filter; policy {{ fw4.output_policy(true) }};
 111
 112                 oifname "lo" accept comment "!fw4: Accept traffic towards loopback"
 113
 114                 ct state established,related accept comment "!fw4: Allow outbound established and related flows"
 115 {% if (fw4.default_option("drop_invalid")): %}
 116                 ct state invalid drop comment "!fw4: Drop flows with invalid conntrack state"
 117 {% endif %}
 118 {% for (let rule in fw4.rules("output")): %}
 119                 {%+ include("rule.uc", { fw4, rule }) %}
 120 {% endfor %}
 121 {% for (let zone in fw4.zones()): for (let rule in zone.match_rules): %}
 122                 {%+ include("zone-match.uc", { fw4, zone, rule, direction: "output" }) %}
 123 {% endfor; endfor %}
 124 {% if (fw4.output_policy() == "reject"): %}
 125                 jump handle_reject
 126 {% endif %}
 127         }
 128
 129         chain handle_reject {
 130                 meta l4proto tcp reject with {{
 131                         (fw4.default_option("tcp_reject_code") != "tcp-reset")
 132                                 ? "icmpx type " + fw4.default_option("tcp_reject_code")
 133                                 : "tcp reset"
 134                 }} comment "!fw4: Reject TCP traffic"
 135                 reject with {{
 136                         (fw4.default_option("any_reject_code") != "tcp-reset")
 137                                 ? "icmpx type " + fw4.default_option("any_reject_code")
 138                                 : "tcp reset"
 139                 }} comment "!fw4: Reject any other traffic"
 140         }
 141
 142 {% if (fw4.default_option("synflood_protect")):
 143         let r = fw4.default_option("synflood_rate");
 144         let b = fw4.default_option("synflood_burst");
 145 %}
 146         chain syn_flood {
 147                 tcp flags & (fin | syn | rst | ack) == syn
 148                 {%- if (r): %} limit rate {{ r.rate }}/{{ r.unit }}{% endif %}
 149                 {%- if (b): %} burst {{ b }} packets{% endif %} return comment "!fw4: Accept SYN packets below rate-limit"
 150                 drop comment "!fw4: Drop excess packets"
 151         }
 152
 153 {% endif %}
 154 {% for (let zone in fw4.zones()): %}
 155         chain input_{{ zone.name }} {
 156 {%  for (let rule in fw4.rules("input_"+zone.name)): %}
 157                 {%+ include("rule.uc", { fw4, rule }) %}
 158 {%  endfor %}
 159 {%  if (zone.dflags.dnat): %}
 160                 ct status dnat accept comment "!fw4: Accept port redirections"
 161 {%  endif %}
 162                 jump {{ zone.input }}_from_{{ zone.name }}
 163         }
 164
 165         chain output_{{ zone.name }} {
 166 {%  for (let rule in fw4.rules("output_"+zone.name)): %}
 167                 {%+ include("rule.uc", { fw4, rule }) %}
 168 {%  endfor %}
 169                 jump {{ zone.output }}_to_{{ zone.name }}
 170         }
 171
 172         chain forward_{{ zone.name }} {
 173 {%  for (let rule in fw4.rules("forward_"+zone.name)): %}
 174                 {%+ include("rule.uc", { fw4, rule }) %}
 175 {%  endfor %}
 176 {%  if (zone.dflags.dnat): %}
 177                 ct status dnat accept comment "!fw4: Accept port forwards"
 178 {%  endif %}
 179                 jump {{ zone.forward }}_to_{{ zone.name }}
 180         }
 181
 182 {%  for (let verdict in ["accept", "reject", "drop"]): %}
 183 {%   if (zone.sflags[verdict]): %}
 184         chain {{ verdict }}_from_{{ zone.name }} {
 185 {%    for (let rule in zone.match_rules): %}
 186                 {%+ include("zone-verdict.uc", { fw4, zone, rule, egress: false, verdict }) %}
 187 {%    endfor %}
 188         }
 189
 190 {%   endif %}
 191 {%   if (zone.dflags[verdict]): %}
 192         chain {{ verdict }}_to_{{ zone.name }} {
 193 {%   for (let rule in zone.match_rules): %}
 194                 {%+ include("zone-verdict.uc", { fw4, zone, rule, egress: true, verdict }) %}
 195 {%   endfor %}
 196         }
 197
 198 {%   endif %}
 199 {%  endfor %}
 200 {% endfor %}
 201
 202         #
 203         # NAT rules
 204         #
 205
 206         chain dstnat {
 207                 type nat hook prerouting priority dstnat; policy accept;
 208 {% for (let zone in fw4.zones()): %}
 209 {%  if (zone.dflags.dnat): %}
 210 {%   for (let rule in zone.match_rules): %}
 211                 {%+ include("zone-match.uc", { fw4, zone, rule, direction: "dstnat" }) %}
 212 {%   endfor %}
 213 {%  endif %}
 214 {% endfor %}
 215         }
 216
 217         chain srcnat {
 218                 type nat hook postrouting priority srcnat; policy accept;
 219 {% for (let redirect in fw4.redirects("srcnat")): %}
 220                 {%+ include("redirect.uc", { fw4, redirect }) %}
 221 {% endfor %}
 222 {% for (let zone in fw4.zones()): %}
 223 {%  if (zone.dflags.snat): %}
 224 {%   for (let rule in zone.match_rules): %}
 225                 {%+ include("zone-match.uc", { fw4, zone, rule, direction: "srcnat" }) %}
 226 {%   endfor %}
 227 {%  endif %}
 228 {% endfor %}
 229         }
 230
 231 {% for (let zone in fw4.zones()): %}
 232 {%  if (zone.dflags.dnat): %}
 233         chain dstnat_{{ zone.name }} {
 234 {% for (let redirect in fw4.redirects("dstnat_"+zone.name)): %}
 235                 {%+ include("redirect.uc", { fw4, redirect }) %}
 236 {% endfor %}
 237         }
 238
 239 {%  endif %}
 240 {%  if (zone.dflags.snat): %}
 241         chain srcnat_{{ zone.name }} {
 242 {% for (let redirect in fw4.redirects("srcnat_"+zone.name)): %}
 243                 {%+ include("redirect.uc", { fw4, redirect }) %}
 244 {% endfor %}
 245 {%   if (zone.masq): %}
 246                 meta nfproto ipv4 {%+ if (zone.masq4_src_pos): -%}
 247                         ip saddr {{ fw4.set(zone.masq4_src_pos) }} {%+ endif -%}
 248                 {%+ if (zone.masq4_src_neg): -%}
 249                         ip saddr != {{ fw4.set(zone.masq4_src_neg) }} {%+ endif -%}
 250                 {%+ if (zone.masq4_dest_pos): -%}
 251                         ip daddr {{ fw4.set(zone.masq4_dest_pos) }} {%+ endif -%}
 252                 {%+ if (zone.masq4_dest_neg): -%}
 253                         ip daddr != {{ fw4.set(zone.masq4_dest_neg) }} {%+ endif -%}
 254                 masquerade comment "!fw4: Masquerade IPv4 {{ zone.name }} traffic"
 255 {%   endif %}
 256 {%   if (zone.masq6): %}
 257                 meta nfproto ipv6 {%+ if (zone.masq6_src_pos): -%}
 258                         ip6 saddr {{ fw4.set(zone.masq6_src_pos) }} {%+ endif -%}
 259                 {%+ if (zone.masq6_src_neg): -%}
 260                         ip6 saddr != {{ fw4.set(zone.masq6_src_neg) }} {%+ endif -%}
 261                 {%+ if (zone.masq6_dest_pos): -%}
 262                         ip6 daddr {{ fw4.set(zone.masq6_dest_pos) }} {%+ endif -%}
 263                 {%+ if (zone.masq6_dest_neg): -%}
 264                         ip6 daddr != {{ fw4.set(zone.masq6_dest_neg) }} {%+ endif -%}
 265                 masquerade comment "!fw4: Masquerade IPv6 {{ zone.name }} traffic"
 266 {%   endif %}
 267         }
 268
 269 {%  endif %}
 270 {% endfor %}
 271
 272         #
 273         # Raw rules (notrack & helper)
 274         #
 275
 276         chain raw_prerouting {
 277                 type filter hook prerouting priority raw; policy accept;
 278 {% for (let target in ["helper", "notrack"]): %}
 279 {%  for (let zone in fw4.zones()): %}
 280 {%   if (zone.dflags[target]): %}
 281 {%    for (let rule in zone.match_rules): %}
 282 {%     let devs = fw4.filter_loopback_devs(rule.devices_pos, false); %}
 283 {%     let nets = fw4.filter_loopback_addrs(rule.subnets_pos, false); %}
 284 {%     if (rule.devices_neg || rule.subnets_neg || length(devs) || length(nets)): %}
 285                 {%+ if (rule.family): -%}
 286                         meta nfproto {{ fw4.nfproto(rule.family) }} {%+ endif -%}
 287                 {%+ if (length(devs)): -%}
 288                         iifname {{ fw4.set(devs) }} {%+ endif -%}
 289                 {%+ if (rule.devices_neg): -%}
 290                         iifname != {{ fw4.set(rule.devices_neg) }} {%+ endif -%}
 291                 {%+ if (length(nets)): -%}
 292                         {{ fw4.ipproto(rule.family) }} saddr {{ fw4.set(nets) }} {%+ endif -%}
 293                 {%+ if (rule.subnets_neg): -%}
 294                         {{ fw4.ipproto(rule.family) }} saddr != {{ fw4.set(rule.subnets_neg) }} {%+ endif -%}
 295                 jump {{ target }}_{{ zone.name }} comment "!fw4: {{ zone.name }} {{ fw4.nfproto(rule.family, true) }} {{
 296                         (target == "helper") ? "CT helper assignment" : "CT bypass"
 297                 }}"
 298 {%     endif %}
 299 {%    endfor %}
 300 {%   endif %}
 301 {%  endfor %}
 302 {% endfor %}
 303         }
 304
 305         chain raw_output {
 306                 type filter hook output priority raw; policy accept;
 307 {% for (let target in ["helper", "notrack"]): %}
 308 {%  for (let zone in fw4.zones()): %}
 309 {%   if (zone.dflags[target]): %}
 310 {%    for (let rule in zone.match_rules): %}
 311 {%     let devs = fw4.filter_loopback_devs(rule.devices_pos, true); %}
 312 {%     let nets = fw4.filter_loopback_addrs(rule.subnets_pos, true); %}
 313 {%     if (length(devs) || length(nets)): %}
 314                 {%+ if (rule.family): -%}
 315                         meta nfproto {{ fw4.nfproto(rule.family) }} {%+ endif -%}
 316                 {%+ if (length(devs)): -%}
 317                         iifname {{ fw4.set(devs) }} {%+ endif -%}
 318                 {%+ if (length(nets)): -%}
 319                         {{ fw4.ipproto(rule.family) }} saddr {{ fw4.set(nets) }} {%+ endif -%}
 320                 jump {{ target }}_{{ zone.name }} comment "!fw4: {{ zone.name }} {{ fw4.nfproto(rule.family, true) }} {{
 321                         (target == "helper") ? "CT helper assignment" : "CT bypass"
 322                 }}"
 323 {%     endif %}
 324 {%    endfor %}
 325 {%   endif %}
 326 {%  endfor %}
 327 {% endfor %}
 328         }
 329
 330 {% for (let helper in fw4.helpers()): %}
 331 {%  if (helper.available): %}
 332 {%   for (let proto in helper.proto): %}
 333         ct helper {{ helper.name }} {
 334                 type {{ fw4.quote(helper.name, true) }} protocol {{ proto.name }};
 335         }
 336
 337 {%   endfor %}
 338 {%  endif %}
 339 {% endfor %}
 340 {% for (let target in ["helper", "notrack"]): %}
 341 {%  for (let zone in fw4.zones()): %}
 342 {%   if (zone.dflags[target]): %}
 343         chain {{ target }}_{{ zone.name }} {
 344 {% for (let rule in fw4.rules(target+"_"+zone.name)): %}
 345                 {%+ include("rule.uc", { fw4, rule }) %}
 346 {% endfor %}
 347         }
 348
 349 {%   endif %}
 350 {%  endfor %}
 351 {% endfor %}
 352
 353         #
 354         # Mangle rules
 355         #
 356
 357         chain mangle_prerouting {
 358                 type filter hook prerouting priority mangle; policy accept;
 359 {% for (let rule in fw4.rules("mangle_prerouting")): %}
 360                 {%+ include("rule.uc", { fw4, rule }) %}
 361 {% endfor %}
 362         }
 363
 364         chain mangle_output {
 365                 type filter 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 zone in fw4.zones()): %}
 374 {%  if (zone.mtu_fix): %}
 375 {%   for (let rule in zone.match_rules): %}
 376                 {%+ include("zone-mssfix.uc", { fw4, zone, rule, egress: false }) %}
 377                 {%+ include("zone-mssfix.uc", { fw4, zone, rule, egress: true }) %}
 378 {%   endfor %}
 379 {%  endif %}
 380 {% endfor %}
 381         }
 382 }