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

   1 table inet fw4
   2 flush table inet fw4
   3 {% if (flowtable): %}
   4 delete flowtable inet fw4 ft
   5 {% endif %}
   6
   7 table inet fw4 {
   8 {% if (fw4.default_option("flow_offloading") && length(devices) > 0): %}
   9         #
  10         # Flowtable
  11         #
  12
  13         flowtable ft {
  14                 hook ingress priority 0;
  15                 devices = {{ fw4.set(devices, true) }};
  16 {% if (fw4.default_option("flow_offloading_hw")): %}
  17                 flags offload;
  18 {% endif %}
  19         }
  20
  21 {% endif %}
  22         #
  23         # Set definitions
  24         #
  25
  26 {% for (let set in fw4.ipsets()): %}
  27         set {{ set.name }} {
  28                 type {{ fw4.concat(set.types) }}
  29 {%  if (set.maxelem > 0): %}
  30                 size {{ set.maxelem }}
  31 {%  endif %}
  32 {%  if (set.timeout >= 0): %}
  33                 timeout {{ set.timeout }}s
  34 {% endif %}
  35 {%  if (set.interval): %}
  36                 flags interval
  37 {%  endif %}
  38 {%  fw4.print_setentries(set) %}
  39         }
  40
  41 {% endfor %}
  42
  43         #
  44         # Defines
  45         #
  46
  47 {% for (let zone in fw4.zones()): %}
  48 {%  if (length(zone.match_devices)): %}
  49         define {{ zone.name }}_devices = {{ fw4.set(zone.match_devices, true) }}
  50 {%  endif %}
  51 {%  if (length(zone.match_subnets)): %}
  52         define {{ zone.name }}_subnets = {{ fw4.set(zone.match_subnets, true) }}
  53 {%  endif %}
  54 {% endfor %}
  55
  56         #
  57         # User includes
  58         #
  59
  60         include "/etc/nftables.d/*.nft"
  61
  62
  63         #
  64         # Filter rules
  65         #
  66
  67         chain input {
  68                 type filter hook input priority filter; policy {{ fw4.input_policy(true) }};
  69
  70                 iifname "lo" accept comment "!fw4: Accept traffic from loopback"
  71
  72                 ct state established,related accept comment "!fw4: Allow inbound established and related flows"
  73 {% if (fw4.default_option("drop_invalid")): %}
  74                 ct state invalid drop comment "!fw4: Drop flows with invalid conntrack state"
  75 {% endif %}
  76 {% if (fw4.default_option("synflood_protect") && fw4.default_option("synflood_rate")): %}
  77                 tcp flags & (fin | syn | rst | ack) == syn jump syn_flood comment "!fw4: Rate limit TCP syn packets"
  78 {% endif %}
  79 {% for (let rule in fw4.rules("input")): %}
  80                 {%+ include("rule.uc", { fw4, rule }) %}
  81 {% endfor %}
  82 {% for (let zone in fw4.zones()): for (let rule in zone.match_rules): %}
  83                 {%+ include("zone-jump.uc", { fw4, zone, rule, direction: "input" }) %}
  84 {% endfor; endfor %}
  85 {% if (fw4.input_policy() == "reject"): %}
  86                 jump handle_reject
  87 {% endif %}
  88         }
  89
  90         chain forward {
  91                 type filter hook forward priority filter; policy {{ fw4.forward_policy(true) }};
  92
  93 {% if (fw4.default_option("flow_offloading") && length(devices) > 0): %}
  94                 meta l4proto { tcp, udp } flow offload @ft;
  95 {% endif %}
  96                 ct state established,related accept comment "!fw4: Allow forwarded established and related flows"
  97 {% if (fw4.default_option("drop_invalid")): %}
  98                 ct state invalid drop comment "!fw4: Drop flows with invalid conntrack state"
  99 {% endif %}
 100 {% for (let rule in fw4.rules("forward")): %}
 101                 {%+ include("rule.uc", { fw4, rule }) %}
 102 {% endfor %}
 103 {% for (let zone in fw4.zones()): for (let rule in zone.match_rules): %}
 104                 {%+ include("zone-jump.uc", { fw4, zone, rule, direction: "forward" }) %}
 105 {% endfor; endfor %}
 106 {% if (fw4.forward_policy() == "reject"): %}
 107                 jump handle_reject
 108 {% endif %}
 109         }
 110
 111         chain output {
 112                 type filter hook output priority filter; policy {{ fw4.output_policy(true) }};
 113
 114                 oifname "lo" accept comment "!fw4: Accept traffic towards loopback"
 115
 116                 ct state established,related accept comment "!fw4: Allow outbound established and related flows"
 117 {% if (fw4.default_option("drop_invalid")): %}
 118                 ct state invalid drop comment "!fw4: Drop flows with invalid conntrack state"
 119 {% endif %}
 120 {% for (let rule in fw4.rules("output")): %}
 121                 {%+ include("rule.uc", { fw4, rule }) %}
 122 {% endfor %}
 123 {% for (let zone in fw4.zones()): for (let rule in zone.match_rules): %}
 124                 {%+ include("zone-jump.uc", { fw4, zone, rule, direction: "output" }) %}
 125 {% endfor; endfor %}
 126 {% if (fw4.output_policy() == "reject"): %}
 127                 jump handle_reject
 128 {% endif %}
 129         }
 130
 131         chain handle_reject {
 132                 meta l4proto tcp reject with {{
 133                         (fw4.default_option("tcp_reject_code") != "tcp-reset")
 134                                 ? "icmpx type " + fw4.default_option("tcp_reject_code")
 135                                 : "tcp reset"
 136                 }} comment "!fw4: Reject TCP traffic"
 137                 reject with {{
 138                         (fw4.default_option("any_reject_code") != "tcp-reset")
 139                                 ? "icmpx type " + fw4.default_option("any_reject_code")
 140                                 : "tcp reset"
 141                 }} comment "!fw4: Reject any other traffic"
 142         }
 143
 144 {% if (fw4.default_option("synflood_protect") && fw4.default_option("synflood_rate")):
 145         let r = fw4.default_option("synflood_rate");
 146         let b = fw4.default_option("synflood_burst");
 147 %}
 148         chain syn_flood {
 149                 limit rate {{ r.rate }}/{{ r.unit }}
 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-jump.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-jump.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 {%    for (let saddrs in zone.masq4_src_subnets): %}
 248 {%     for (let daddrs in zone.masq4_dest_subnets): %}
 249                 {%+ include("zone-masq.uc", { fw4, zone, family: 4, saddrs, daddrs }) %}
 250 {%     endfor %}
 251 {%    endfor %}
 252 {%   endif %}
 253 {%   if (zone.masq6): %}
 254 {%    for (let saddrs in zone.masq6_src_subnets): %}
 255 {%     for (let daddrs in zone.masq6_dest_subnets): %}
 256                 {%+ include("zone-masq.uc", { fw4, zone, family: 6, saddrs, daddrs }) %}
 257 {%     endfor %}
 258 {%    endfor %}
 259 {%   endif %}
 260         }
 261
 262 {%  endif %}
 263 {% endfor %}
 264
 265         #
 266         # Raw rules (notrack & helper)
 267         #
 268
 269         chain raw_prerouting {
 270                 type filter hook prerouting priority raw; policy accept;
 271 {% for (let target in ["helper", "notrack"]): %}
 272 {%  for (let zone in fw4.zones()): %}
 273 {%   if (zone.dflags[target]): %}
 274 {%    for (let rule in zone.match_rules): %}
 275 {%     let devices_pos = fw4.filter_loopback_devs(rule.devices_pos, false); %}
 276 {%     let subnets_pos = fw4.filter_loopback_addrs(rule.subnets_pos, false); %}
 277 {%     if (rule.devices_neg || rule.subnets_neg || devices_pos || subnets_pos): %}
 278                 {%+ if (rule.family): -%}
 279                         meta nfproto {{ fw4.nfproto(rule.family) }} {%+ endif -%}
 280                 {%+ include("zone-match.uc", { fw4, egress: false, rule: { ...rule, devices_pos, subnets_pos } }) -%}
 281                 jump {{ target }}_{{ zone.name }} comment "!fw4: {{ zone.name }} {{ fw4.nfproto(rule.family, true) }} {{
 282                         (target == "helper") ? "CT helper assignment" : "CT bypass"
 283                 }}"
 284 {%     endif %}
 285 {%    endfor %}
 286 {%   endif %}
 287 {%  endfor %}
 288 {% endfor %}
 289         }
 290
 291         chain raw_output {
 292                 type filter hook output priority raw; policy accept;
 293 {% for (let target in ["helper", "notrack"]): %}
 294 {%  for (let zone in fw4.zones()): %}
 295 {%   if (zone.dflags[target]): %}
 296 {%    for (let rule in zone.match_rules): %}
 297 {%     let devices_pos = fw4.filter_loopback_devs(rule.devices_pos, true); %}
 298 {%     let subnets_pos = fw4.filter_loopback_addrs(rule.subnets_pos, true); %}
 299 {%     if (devices_pos || subnets_pos): %}
 300                 {%+ if (rule.family): -%}
 301                         meta nfproto {{ fw4.nfproto(rule.family) }} {%+ endif -%}
 302                 {%+ include("zone-match.uc", { fw4, egress: false, rule: { ...rule, devices_pos, subnets_pos } }) -%}
 303                 jump {{ target }}_{{ zone.name }} comment "!fw4: {{ zone.name }} {{ fw4.nfproto(rule.family, true) }} {{
 304                         (target == "helper") ? "CT helper assignment" : "CT bypass"
 305                 }}"
 306 {%     endif %}
 307 {%    endfor %}
 308 {%   endif %}
 309 {%  endfor %}
 310 {% endfor %}
 311         }
 312
 313 {% for (let helper in fw4.helpers()): %}
 314 {%  if (helper.available): %}
 315 {%   for (let proto in helper.proto): %}
 316         ct helper {{ helper.name }} {
 317                 type {{ fw4.quote(helper.name, true) }} protocol {{ proto.name }};
 318         }
 319
 320 {%   endfor %}
 321 {%  endif %}
 322 {% endfor %}
 323 {% for (let target in ["helper", "notrack"]): %}
 324 {%  for (let zone in fw4.zones()): %}
 325 {%   if (zone.dflags[target]): %}
 326         chain {{ target }}_{{ zone.name }} {
 327 {% for (let rule in fw4.rules(target+"_"+zone.name)): %}
 328                 {%+ include("rule.uc", { fw4, rule }) %}
 329 {% endfor %}
 330         }
 331
 332 {%   endif %}
 333 {%  endfor %}
 334 {% endfor %}
 335
 336         #
 337         # Mangle rules
 338         #
 339
 340         chain mangle_prerouting {
 341                 type filter hook prerouting priority mangle; policy accept;
 342 {% for (let rule in fw4.rules("mangle_prerouting")): %}
 343                 {%+ include("rule.uc", { fw4, rule }) %}
 344 {% endfor %}
 345         }
 346
 347         chain mangle_postrouting {
 348                 type filter hook postrouting priority mangle; policy accept;
 349 {% for (let rule in fw4.rules("mangle_postrouting")): %}
 350                 {%+ include("rule.uc", { fw4, rule }) %}
 351 {% endfor %}
 352         }
 353
 354         chain mangle_input {
 355                 type filter hook input priority mangle; policy accept;
 356 {% for (let rule in fw4.rules("mangle_input")): %}
 357                 {%+ include("rule.uc", { fw4, rule }) %}
 358 {% endfor %}
 359         }
 360
 361         chain mangle_output {
 362                 type filter hook output priority mangle; policy accept;
 363 {% for (let rule in fw4.rules("mangle_output")): %}
 364                 {%+ include("rule.uc", { fw4, rule }) %}
 365 {% endfor %}
 366         }
 367
 368         chain mangle_forward {
 369                 type filter hook forward priority mangle; policy accept;
 370 {% for (let rule in fw4.rules("mangle_forward")): %}
 371                 {%+ include("rule.uc", { fw4, rule }) %}
 372 {% endfor %}
 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 }