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

   1 {% let flowtable_devices = fw4.resolve_offload_devices(); -%}
   2
   3 table inet fw4
   4 flush table inet fw4
   5 {% if (fw4.check_flowtable()): %}
   6 delete flowtable inet fw4 ft
   7 {% endif %}
   8
   9 table inet fw4 {
  10 {% if (length(flowtable_devices) > 0): %}
  11         #
  12         # Flowtable
  13         #
  14
  15         flowtable ft {
  16                 hook ingress priority 0;
  17                 devices = {{ fw4.set(flowtable_devices, true) }};
  18 {% if (fw4.default_option("flow_offloading_hw")): %}
  19                 flags offload;
  20 {% endif %}
  21         }
  22
  23 {% endif %}
  24         #
  25         # Set definitions
  26         #
  27
  28 {% for (let set in fw4.ipsets()): %}
  29         set {{ set.name }} {
  30                 type {{ fw4.concat(set.types) }}
  31 {%  if (set.maxelem > 0): %}
  32                 size {{ set.maxelem }}
  33 {%  endif %}
  34 {%  if (set.timeout >= 0): %}
  35                 timeout {{ set.timeout }}s
  36 {% endif %}
  37 {%  if (set.interval): %}
  38                 flags interval
  39 {%  endif %}
  40 {%  fw4.print_setentries(set) %}
  41         }
  42
  43 {% endfor %}
  44
  45         #
  46         # Defines
  47         #
  48
  49 {% for (let zone in fw4.zones()): %}
  50 {%  if (length(zone.match_devices)): %}
  51         define {{ zone.name }}_devices = {{ fw4.set(zone.match_devices, true) }}
  52 {%  endif %}
  53 {%  if (length(zone.match_subnets)): %}
  54         define {{ zone.name }}_subnets = {{ fw4.set(zone.match_subnets, true) }}
  55 {%  endif %}
  56 {% endfor %}
  57
  58         #
  59         # User includes
  60         #
  61
  62         include "/etc/nftables.d/*.nft"
  63
  64
  65         #
  66         # Filter rules
  67         #
  68
  69         chain input {
  70                 type filter hook input priority filter; policy {{ fw4.input_policy(true) }};
  71
  72                 iifname "lo" accept comment "!fw4: Accept traffic from loopback"
  73
  74                 ct state established,related accept comment "!fw4: Allow inbound established and related flows"
  75 {% if (fw4.default_option("drop_invalid")): %}
  76                 ct state invalid drop comment "!fw4: Drop flows with invalid conntrack state"
  77 {% endif %}
  78 {% if (fw4.default_option("synflood_protect") && fw4.default_option("synflood_rate")): %}
  79                 tcp flags & (fin | syn | rst | ack) == syn jump syn_flood comment "!fw4: Rate limit TCP syn packets"
  80 {% endif %}
  81 {% for (let rule in fw4.rules("input")): %}
  82                 {%+ include("rule.uc", { fw4, rule }) %}
  83 {% endfor %}
  84 {% for (let zone in fw4.zones()): for (let rule in zone.match_rules): %}
  85                 {%+ include("zone-jump.uc", { fw4, zone, rule, direction: "input" }) %}
  86 {% endfor; endfor %}
  87 {% if (fw4.input_policy() == "reject"): %}
  88                 jump handle_reject
  89 {% endif %}
  90         }
  91
  92         chain forward {
  93                 type filter hook forward priority filter; policy {{ fw4.forward_policy(true) }};
  94
  95 {% if (length(flowtable_devices) > 0): %}
  96                 meta l4proto { tcp, udp } flow offload @ft;
  97 {% endif %}
  98                 ct state established,related accept comment "!fw4: Allow forwarded established and related flows"
  99 {% if (fw4.default_option("drop_invalid")): %}
 100                 ct state invalid drop comment "!fw4: Drop flows with invalid conntrack state"
 101 {% endif %}
 102 {% for (let rule in fw4.rules("forward")): %}
 103                 {%+ include("rule.uc", { fw4, rule }) %}
 104 {% endfor %}
 105 {% for (let zone in fw4.zones()): for (let rule in zone.match_rules): %}
 106                 {%+ include("zone-jump.uc", { fw4, zone, rule, direction: "forward" }) %}
 107 {% endfor; endfor %}
 108 {% if (fw4.forward_policy() == "reject"): %}
 109                 jump handle_reject
 110 {% endif %}
 111         }
 112
 113         chain output {
 114                 type filter hook output priority filter; policy {{ fw4.output_policy(true) }};
 115
 116                 oifname "lo" accept comment "!fw4: Accept traffic towards loopback"
 117
 118                 ct state established,related accept comment "!fw4: Allow outbound established and related flows"
 119 {% if (fw4.default_option("drop_invalid")): %}
 120                 ct state invalid drop comment "!fw4: Drop flows with invalid conntrack state"
 121 {% endif %}
 122 {% for (let rule in fw4.rules("output")): %}
 123                 {%+ include("rule.uc", { fw4, rule }) %}
 124 {% endfor %}
 125 {% for (let zone in fw4.zones()): for (let rule in zone.match_rules): %}
 126                 {%+ include("zone-jump.uc", { fw4, zone, rule, direction: "output" }) %}
 127 {% endfor; endfor %}
 128 {% if (fw4.output_policy() == "reject"): %}
 129                 jump handle_reject
 130 {% endif %}
 131         }
 132
 133         chain handle_reject {
 134                 meta l4proto tcp reject with {{
 135                         (fw4.default_option("tcp_reject_code") != "tcp-reset")
 136                                 ? "icmpx type " + fw4.default_option("tcp_reject_code")
 137                                 : "tcp reset"
 138                 }} comment "!fw4: Reject TCP traffic"
 139                 reject with {{
 140                         (fw4.default_option("any_reject_code") != "tcp-reset")
 141                                 ? "icmpx type " + fw4.default_option("any_reject_code")
 142                                 : "tcp reset"
 143                 }} comment "!fw4: Reject any other traffic"
 144         }
 145
 146 {% if (fw4.default_option("synflood_protect") && fw4.default_option("synflood_rate")):
 147         let r = fw4.default_option("synflood_rate");
 148         let b = fw4.default_option("synflood_burst");
 149 %}
 150         chain syn_flood {
 151                 limit rate {{ r.rate }}/{{ r.unit }}
 152                 {%- if (b): %} burst {{ b }} packets{% endif %} return comment "!fw4: Accept SYN packets below rate-limit"
 153                 drop comment "!fw4: Drop excess packets"
 154         }
 155
 156 {% endif %}
 157 {% for (let zone in fw4.zones()): %}
 158         chain input_{{ zone.name }} {
 159 {%  for (let rule in fw4.rules("input_"+zone.name)): %}
 160                 {%+ include("rule.uc", { fw4, rule }) %}
 161 {%  endfor %}
 162 {%  if (zone.dflags.dnat): %}
 163                 ct status dnat accept comment "!fw4: Accept port redirections"
 164 {%  endif %}
 165                 jump {{ zone.input }}_from_{{ zone.name }}
 166         }
 167
 168         chain output_{{ zone.name }} {
 169 {%  for (let rule in fw4.rules("output_"+zone.name)): %}
 170                 {%+ include("rule.uc", { fw4, rule }) %}
 171 {%  endfor %}
 172                 jump {{ zone.output }}_to_{{ zone.name }}
 173         }
 174
 175         chain forward_{{ zone.name }} {
 176 {%  for (let rule in fw4.rules("forward_"+zone.name)): %}
 177                 {%+ include("rule.uc", { fw4, rule }) %}
 178 {%  endfor %}
 179 {%  if (zone.dflags.dnat): %}
 180                 ct status dnat accept comment "!fw4: Accept port forwards"
 181 {%  endif %}
 182                 jump {{ zone.forward }}_to_{{ zone.name }}
 183         }
 184
 185 {%  for (let verdict in ["accept", "reject", "drop"]): %}
 186 {%   if (zone.sflags[verdict]): %}
 187         chain {{ verdict }}_from_{{ zone.name }} {
 188 {%    for (let rule in zone.match_rules): %}
 189                 {%+ include("zone-verdict.uc", { fw4, zone, rule, egress: false, verdict }) %}
 190 {%    endfor %}
 191         }
 192
 193 {%   endif %}
 194 {%   if (zone.dflags[verdict]): %}
 195         chain {{ verdict }}_to_{{ zone.name }} {
 196 {%   for (let rule in zone.match_rules): %}
 197                 {%+ include("zone-verdict.uc", { fw4, zone, rule, egress: true, verdict }) %}
 198 {%   endfor %}
 199         }
 200
 201 {%   endif %}
 202 {%  endfor %}
 203 {% endfor %}
 204
 205         #
 206         # NAT rules
 207         #
 208
 209         chain dstnat {
 210                 type nat hook prerouting priority dstnat; policy accept;
 211 {% for (let zone in fw4.zones()): %}
 212 {%  if (zone.dflags.dnat): %}
 213 {%   for (let rule in zone.match_rules): %}
 214                 {%+ include("zone-jump.uc", { fw4, zone, rule, direction: "dstnat" }) %}
 215 {%   endfor %}
 216 {%  endif %}
 217 {% endfor %}
 218         }
 219
 220         chain srcnat {
 221                 type nat hook postrouting priority srcnat; policy accept;
 222 {% for (let redirect in fw4.redirects("srcnat")): %}
 223                 {%+ include("redirect.uc", { fw4, redirect }) %}
 224 {% endfor %}
 225 {% for (let zone in fw4.zones()): %}
 226 {%  if (zone.dflags.snat): %}
 227 {%   for (let rule in zone.match_rules): %}
 228                 {%+ include("zone-jump.uc", { fw4, zone, rule, direction: "srcnat" }) %}
 229 {%   endfor %}
 230 {%  endif %}
 231 {% endfor %}
 232         }
 233
 234 {% for (let zone in fw4.zones()): %}
 235 {%  if (zone.dflags.dnat): %}
 236         chain dstnat_{{ zone.name }} {
 237 {%   for (let redirect in fw4.redirects("dstnat_"+zone.name)): %}
 238                 {%+ include("redirect.uc", { fw4, redirect }) %}
 239 {%   endfor %}
 240         }
 241
 242 {%  endif %}
 243 {%  if (zone.dflags.snat): %}
 244         chain srcnat_{{ zone.name }} {
 245 {%   for (let redirect in fw4.redirects("srcnat_"+zone.name)): %}
 246                 {%+ include("redirect.uc", { fw4, redirect }) %}
 247 {%   endfor %}
 248 {%   if (zone.masq): %}
 249 {%    for (let saddrs in zone.masq4_src_subnets): %}
 250 {%     for (let daddrs in zone.masq4_dest_subnets): %}
 251                 {%+ include("zone-masq.uc", { fw4, zone, family: 4, saddrs, daddrs }) %}
 252 {%     endfor %}
 253 {%    endfor %}
 254 {%   endif %}
 255 {%   if (zone.masq6): %}
 256 {%    for (let saddrs in zone.masq6_src_subnets): %}
 257 {%     for (let daddrs in zone.masq6_dest_subnets): %}
 258                 {%+ include("zone-masq.uc", { fw4, zone, family: 6, saddrs, daddrs }) %}
 259 {%     endfor %}
 260 {%    endfor %}
 261 {%   endif %}
 262         }
 263
 264 {%  endif %}
 265 {% endfor %}
 266
 267         #
 268         # Raw rules (notrack & helper)
 269         #
 270
 271         chain raw_prerouting {
 272                 type filter hook prerouting priority raw; policy accept;
 273 {% for (let target in ["helper", "notrack"]): %}
 274 {%  for (let zone in fw4.zones()): %}
 275 {%   if (zone.dflags[target]): %}
 276 {%    for (let rule in zone.match_rules): %}
 277 {%     let devices_pos = fw4.filter_loopback_devs(rule.devices_pos, false); %}
 278 {%     let subnets_pos = fw4.filter_loopback_addrs(rule.subnets_pos, false); %}
 279 {%     if (rule.devices_neg || rule.subnets_neg || devices_pos || subnets_pos): %}
 280                 {%+ if (rule.family): -%}
 281                         meta nfproto {{ fw4.nfproto(rule.family) }} {%+ endif -%}
 282                 {%+ include("zone-match.uc", { fw4, egress: false, rule: { ...rule, devices_pos, subnets_pos } }) -%}
 283                 jump {{ target }}_{{ zone.name }} comment "!fw4: {{ zone.name }} {{ fw4.nfproto(rule.family, true) }} {{
 284                         (target == "helper") ? "CT helper assignment" : "CT bypass"
 285                 }}"
 286 {%     endif %}
 287 {%    endfor %}
 288 {%   endif %}
 289 {%  endfor %}
 290 {% endfor %}
 291         }
 292
 293         chain raw_output {
 294                 type filter hook output priority raw; policy accept;
 295 {% for (let target in ["helper", "notrack"]): %}
 296 {%  for (let zone in fw4.zones()): %}
 297 {%   if (zone.dflags[target]): %}
 298 {%    for (let rule in zone.match_rules): %}
 299 {%     let devices_pos = fw4.filter_loopback_devs(rule.devices_pos, true); %}
 300 {%     let subnets_pos = fw4.filter_loopback_addrs(rule.subnets_pos, true); %}
 301 {%     if (devices_pos || subnets_pos): %}
 302                 {%+ if (rule.family): -%}
 303                         meta nfproto {{ fw4.nfproto(rule.family) }} {%+ endif -%}
 304                 {%+ include("zone-match.uc", { fw4, egress: false, rule: { ...rule, devices_pos, subnets_pos } }) -%}
 305                 jump {{ target }}_{{ zone.name }} comment "!fw4: {{ zone.name }} {{ fw4.nfproto(rule.family, true) }} {{
 306                         (target == "helper") ? "CT helper assignment" : "CT bypass"
 307                 }}"
 308 {%     endif %}
 309 {%    endfor %}
 310 {%   endif %}
 311 {%  endfor %}
 312 {% endfor %}
 313         }
 314
 315 {% for (let helper in fw4.helpers()): %}
 316 {%  if (helper.available): %}
 317 {%   for (let proto in helper.proto): %}
 318         ct helper {{ helper.name }} {
 319                 type {{ fw4.quote(helper.name, true) }} protocol {{ proto.name }};
 320         }
 321
 322 {%   endfor %}
 323 {%  endif %}
 324 {% endfor %}
 325 {% for (let target in ["helper", "notrack"]): %}
 326 {%  for (let zone in fw4.zones()): %}
 327 {%   if (zone.dflags[target]): %}
 328         chain {{ target }}_{{ zone.name }} {
 329 {% for (let rule in fw4.rules(target+"_"+zone.name)): %}
 330                 {%+ include("rule.uc", { fw4, rule }) %}
 331 {% endfor %}
 332         }
 333
 334 {%   endif %}
 335 {%  endfor %}
 336 {% endfor %}
 337
 338         #
 339         # Mangle rules
 340         #
 341
 342         chain mangle_prerouting {
 343                 type filter hook prerouting priority mangle; policy accept;
 344 {% for (let rule in fw4.rules("mangle_prerouting")): %}
 345                 {%+ include("rule.uc", { fw4, rule }) %}
 346 {% endfor %}
 347         }
 348
 349         chain mangle_postrouting {
 350                 type filter hook postrouting priority mangle; policy accept;
 351 {% for (let rule in fw4.rules("mangle_postrouting")): %}
 352                 {%+ include("rule.uc", { fw4, rule }) %}
 353 {% endfor %}
 354         }
 355
 356         chain mangle_input {
 357                 type filter hook input priority mangle; policy accept;
 358 {% for (let rule in fw4.rules("mangle_input")): %}
 359                 {%+ include("rule.uc", { fw4, rule }) %}
 360 {% endfor %}
 361         }
 362
 363         chain mangle_output {
 364                 type filter hook output priority mangle; policy accept;
 365 {% for (let rule in fw4.rules("mangle_output")): %}
 366                 {%+ include("rule.uc", { fw4, rule }) %}
 367 {% endfor %}
 368         }
 369
 370         chain mangle_forward {
 371                 type filter hook forward priority mangle; policy accept;
 372 {% for (let rule in fw4.rules("mangle_forward")): %}
 373                 {%+ include("rule.uc", { fw4, rule }) %}
 374 {% endfor %}
 375 {% for (let zone in fw4.zones()): %}
 376 {%  if (zone.mtu_fix): %}
 377 {%   for (let rule in zone.match_rules): %}
 378                 {%+ include("zone-mssfix.uc", { fw4, zone, rule, egress: false }) %}
 379                 {%+ include("zone-mssfix.uc", { fw4, zone, rule, egress: true }) %}
 380 {%   endfor %}
 381 {%  endif %}
 382 {% endfor %}
 383         }
 384 }