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                 ip protocol { tcp , udp } flow offload @ft;
  93                 ip6 nexthdr { tcp , udp } flow offload @ft;
  94 {% endif %}
  95                 ct state established,related accept comment "!fw4: Allow forwarded established and related flows"
  96 {% if (fw4.default_option("drop_invalid")): %}
  97                 ct state invalid drop comment "!fw4: Drop flows with invalid conntrack state"
  98 {% endif %}
  99 {% for (let rule in fw4.rules("forward")): %}
 100                 {%+ include("rule.uc", { fw4, rule }) %}
 101 {% endfor %}
 102 {% for (let zone in fw4.zones()): for (let rule in zone.match_rules): %}
 103                 {%+ include("zone-match.uc", { fw4, zone, rule, direction: "forward" }) %}
 104 {% endfor; endfor %}
 105 {% if (fw4.forward_policy() == "reject"): %}
 106                 jump handle_reject
 107 {% endif %}
 108         }
 109
 110         chain output {
 111                 type filter hook output priority filter; policy {{ fw4.output_policy(true) }};
 112
 113                 oifname "lo" accept comment "!fw4: Accept traffic towards loopback"
 114
 115                 ct state established,related accept comment "!fw4: Allow outbound established and related flows"
 116 {% if (fw4.default_option("drop_invalid")): %}
 117                 ct state invalid drop comment "!fw4: Drop flows with invalid conntrack state"
 118 {% endif %}
 119 {% for (let rule in fw4.rules("output")): %}
 120                 {%+ include("rule.uc", { fw4, rule }) %}
 121 {% endfor %}
 122 {% for (let zone in fw4.zones()): for (let rule in zone.match_rules): %}
 123                 {%+ include("zone-match.uc", { fw4, zone, rule, direction: "output" }) %}
 124 {% endfor; endfor %}
 125 {% if (fw4.output_policy() == "reject"): %}
 126                 jump handle_reject
 127 {% endif %}
 128         }
 129
 130         chain handle_reject {
 131                 meta l4proto tcp reject with {{
 132                         (fw4.default_option("tcp_reject_code") != "tcp-reset")
 133                                 ? "icmpx type " + fw4.default_option("tcp_reject_code")
 134                                 : "tcp reset"
 135                 }} comment "!fw4: Reject TCP traffic"
 136                 reject with {{
 137                         (fw4.default_option("any_reject_code") != "tcp-reset")
 138                                 ? "icmpx type " + fw4.default_option("any_reject_code")
 139                                 : "tcp reset"
 140                 }} comment "!fw4: Reject any other traffic"
 141         }
 142
 143 {% if (fw4.default_option("synflood_protect")):
 144         let r = fw4.default_option("synflood_rate");
 145         let b = fw4.default_option("synflood_burst");
 146 %}
 147         chain syn_flood {
 148                 tcp flags & (fin | syn | rst | ack) == syn
 149                 {%- if (r): %} limit rate {{ r.rate }}/{{ r.unit }}{% endif %}
 150                 {%- if (b): %} burst {{ b }} packets{% endif %} return comment "!fw4: Accept SYN packets below rate-limit"
 151                 drop comment "!fw4: Drop excess packets"
 152         }
 153
 154 {% endif %}
 155 {% for (let zone in fw4.zones()): %}
 156         chain input_{{ zone.name }} {
 157 {%  for (let rule in fw4.rules("input_"+zone.name)): %}
 158                 {%+ include("rule.uc", { fw4, rule }) %}
 159 {%  endfor %}
 160 {%  if (zone.dflags.dnat): %}
 161                 ct status dnat accept comment "!fw4: Accept port redirections"
 162 {%  endif %}
 163                 jump {{ zone.input }}_from_{{ zone.name }}
 164         }
 165
 166         chain output_{{ zone.name }} {
 167 {%  for (let rule in fw4.rules("output_"+zone.name)): %}
 168                 {%+ include("rule.uc", { fw4, rule }) %}
 169 {%  endfor %}
 170                 jump {{ zone.output }}_to_{{ zone.name }}
 171         }
 172
 173         chain forward_{{ zone.name }} {
 174 {%  for (let rule in fw4.rules("forward_"+zone.name)): %}
 175                 {%+ include("rule.uc", { fw4, rule }) %}
 176 {%  endfor %}
 177 {%  if (zone.dflags.dnat): %}
 178                 ct status dnat accept comment "!fw4: Accept port forwards"
 179 {%  endif %}
 180                 jump {{ zone.forward }}_to_{{ zone.name }}
 181         }
 182
 183 {%  for (let verdict in ["accept", "reject", "drop"]): %}
 184 {%   if (zone.sflags[verdict]): %}
 185         chain {{ verdict }}_from_{{ zone.name }} {
 186 {%    for (let rule in zone.match_rules): %}
 187                 {%+ include("zone-verdict.uc", { fw4, zone, rule, egress: false, verdict }) %}
 188 {%    endfor %}
 189         }
 190
 191 {%   endif %}
 192 {%   if (zone.dflags[verdict]): %}
 193         chain {{ verdict }}_to_{{ zone.name }} {
 194 {%   for (let rule in zone.match_rules): %}
 195                 {%+ include("zone-verdict.uc", { fw4, zone, rule, egress: true, verdict }) %}
 196 {%   endfor %}
 197         }
 198
 199 {%   endif %}
 200 {%  endfor %}
 201 {% endfor %}
 202
 203         #
 204         # NAT rules
 205         #
 206
 207         chain dstnat {
 208                 type nat hook prerouting priority dstnat; policy accept;
 209 {% for (let zone in fw4.zones()): %}
 210 {%  if (zone.dflags.dnat): %}
 211 {%   for (let rule in zone.match_rules): %}
 212                 {%+ include("zone-match.uc", { fw4, zone, rule, direction: "dstnat" }) %}
 213 {%   endfor %}
 214 {%  endif %}
 215 {% endfor %}
 216         }
 217
 218         chain srcnat {
 219                 type nat hook postrouting priority srcnat; policy accept;
 220 {% for (let redirect in fw4.redirects("srcnat")): %}
 221                 {%+ include("redirect.uc", { fw4, redirect }) %}
 222 {% endfor %}
 223 {% for (let zone in fw4.zones()): %}
 224 {%  if (zone.dflags.snat): %}
 225 {%   for (let rule in zone.match_rules): %}
 226                 {%+ include("zone-match.uc", { fw4, zone, rule, direction: "srcnat" }) %}
 227 {%   endfor %}
 228 {%  endif %}
 229 {% endfor %}
 230         }
 231
 232 {% for (let zone in fw4.zones()): %}
 233 {%  if (zone.dflags.dnat): %}
 234         chain dstnat_{{ zone.name }} {
 235 {% for (let redirect in fw4.redirects("dstnat_"+zone.name)): %}
 236                 {%+ include("redirect.uc", { fw4, redirect }) %}
 237 {% endfor %}
 238         }
 239
 240 {%  endif %}
 241 {%  if (zone.dflags.snat): %}
 242         chain srcnat_{{ zone.name }} {
 243 {% for (let redirect in fw4.redirects("srcnat_"+zone.name)): %}
 244                 {%+ include("redirect.uc", { fw4, redirect }) %}
 245 {% endfor %}
 246 {%   if (zone.masq): %}
 247                 meta nfproto ipv4 {%+ if (zone.masq4_src_pos): -%}
 248                         ip saddr {{ fw4.set(zone.masq4_src_pos) }} {%+ endif -%}
 249                 {%+ if (zone.masq4_src_neg): -%}
 250                         ip saddr != {{ fw4.set(zone.masq4_src_neg) }} {%+ endif -%}
 251                 {%+ if (zone.masq4_dest_pos): -%}
 252                         ip daddr {{ fw4.set(zone.masq4_dest_pos) }} {%+ endif -%}
 253                 {%+ if (zone.masq4_dest_neg): -%}
 254                         ip daddr != {{ fw4.set(zone.masq4_dest_neg) }} {%+ endif -%}
 255                 masquerade comment "!fw4: Masquerade IPv4 {{ zone.name }} traffic"
 256 {%   endif %}
 257 {%   if (zone.masq6): %}
 258                 meta nfproto ipv6 {%+ if (zone.masq6_src_pos): -%}
 259                         ip6 saddr {{ fw4.set(zone.masq6_src_pos) }} {%+ endif -%}
 260                 {%+ if (zone.masq6_src_neg): -%}
 261                         ip6 saddr != {{ fw4.set(zone.masq6_src_neg) }} {%+ endif -%}
 262                 {%+ if (zone.masq6_dest_pos): -%}
 263                         ip6 daddr {{ fw4.set(zone.masq6_dest_pos) }} {%+ endif -%}
 264                 {%+ if (zone.masq6_dest_neg): -%}
 265                         ip6 daddr != {{ fw4.set(zone.masq6_dest_neg) }} {%+ endif -%}
 266                 masquerade comment "!fw4: Masquerade IPv6 {{ zone.name }} traffic"
 267 {%   endif %}
 268         }
 269
 270 {%  endif %}
 271 {% endfor %}
 272
 273         #
 274         # Raw rules (notrack & helper)
 275         #
 276
 277         chain raw_prerouting {
 278                 type filter hook prerouting priority raw; policy accept;
 279 {% for (let target in ["helper", "notrack"]): %}
 280 {%  for (let zone in fw4.zones()): %}
 281 {%   if (zone.dflags[target]): %}
 282 {%    for (let rule in zone.match_rules): %}
 283 {%     let devs = fw4.filter_loopback_devs(rule.devices_pos, false); %}
 284 {%     let nets = fw4.filter_loopback_addrs(rule.subnets_pos, false); %}
 285 {%     if (rule.devices_neg || rule.subnets_neg || length(devs) || length(nets)): %}
 286                 {%+ if (rule.family): -%}
 287                         meta nfproto {{ fw4.nfproto(rule.family) }} {%+ endif -%}
 288                 {%+ if (length(devs)): -%}
 289                         iifname {{ fw4.set(devs) }} {%+ endif -%}
 290                 {%+ if (rule.devices_neg): -%}
 291                         iifname != {{ fw4.set(rule.devices_neg) }} {%+ endif -%}
 292                 {%+ if (length(nets)): -%}
 293                         {{ fw4.ipproto(rule.family) }} saddr {{ fw4.set(nets) }} {%+ endif -%}
 294                 {%+ if (rule.subnets_neg): -%}
 295                         {{ fw4.ipproto(rule.family) }} saddr != {{ fw4.set(rule.subnets_neg) }} {%+ endif -%}
 296                 jump {{ target }}_{{ zone.name }} comment "!fw4: {{ zone.name }} {{ fw4.nfproto(rule.family, true) }} {{
 297                         (target == "helper") ? "CT helper assignment" : "CT bypass"
 298                 }}"
 299 {%     endif %}
 300 {%    endfor %}
 301 {%   endif %}
 302 {%  endfor %}
 303 {% endfor %}
 304         }
 305
 306         chain raw_output {
 307                 type filter hook output priority raw; policy accept;
 308 {% for (let target in ["helper", "notrack"]): %}
 309 {%  for (let zone in fw4.zones()): %}
 310 {%   if (zone.dflags[target]): %}
 311 {%    for (let rule in zone.match_rules): %}
 312 {%     let devs = fw4.filter_loopback_devs(rule.devices_pos, true); %}
 313 {%     let nets = fw4.filter_loopback_addrs(rule.subnets_pos, true); %}
 314 {%     if (length(devs) || length(nets)): %}
 315                 {%+ if (rule.family): -%}
 316                         meta nfproto {{ fw4.nfproto(rule.family) }} {%+ endif -%}
 317                 {%+ if (length(devs)): -%}
 318                         iifname {{ fw4.set(devs) }} {%+ endif -%}
 319                 {%+ if (length(nets)): -%}
 320                         {{ fw4.ipproto(rule.family) }} saddr {{ fw4.set(nets) }} {%+ endif -%}
 321                 jump {{ target }}_{{ zone.name }} comment "!fw4: {{ zone.name }} {{ fw4.nfproto(rule.family, true) }} {{
 322                         (target == "helper") ? "CT helper assignment" : "CT bypass"
 323                 }}"
 324 {%     endif %}
 325 {%    endfor %}
 326 {%   endif %}
 327 {%  endfor %}
 328 {% endfor %}
 329         }
 330
 331 {% for (let helper in fw4.helpers()): %}
 332 {%  if (helper.available): %}
 333 {%   for (let proto in helper.proto): %}
 334         ct helper {{ helper.name }} {
 335                 type {{ fw4.quote(helper.name, true) }} protocol {{ proto.name }};
 336         }
 337
 338 {%   endfor %}
 339 {%  endif %}
 340 {% endfor %}
 341 {% for (let target in ["helper", "notrack"]): %}
 342 {%  for (let zone in fw4.zones()): %}
 343 {%   if (zone.dflags[target]): %}
 344         chain {{ target }}_{{ zone.name }} {
 345 {% for (let rule in fw4.rules(target+"_"+zone.name)): %}
 346                 {%+ include("rule.uc", { fw4, rule }) %}
 347 {% endfor %}
 348         }
 349
 350 {%   endif %}
 351 {%  endfor %}
 352 {% endfor %}
 353
 354         #
 355         # Mangle rules
 356         #
 357
 358         chain mangle_prerouting {
 359                 type filter hook prerouting priority mangle; policy accept;
 360 {% for (let rule in fw4.rules("mangle_prerouting")): %}
 361                 {%+ include("rule.uc", { fw4, rule }) %}
 362 {% endfor %}
 363         }
 364
 365         chain mangle_output {
 366                 type filter hook output priority mangle; policy accept;
 367 {% for (let rule in fw4.rules("mangle_output")): %}
 368                 {%+ include("rule.uc", { fw4, rule }) %}
 369 {% endfor %}
 370         }
 371
 372         chain mangle_forward {
 373                 type filter hook forward priority mangle; policy accept;
 374 {% for (let zone in fw4.zones()): %}
 375 {%  if (zone.mtu_fix): %}
 376 {%   for (let rule in zone.match_rules): %}
 377                 {%+ include("zone-mssfix.uc", { fw4, zone, rule, egress: false }) %}
 378                 {%+ include("zone-mssfix.uc", { fw4, zone, rule, egress: true }) %}
 379 {%   endfor %}
 380 {%  endif %}
 381 {% endfor %}
 382         }
 383 }