#include "zones.h"
#include "ubus.h"
+#include "helpers.h"
#define C(f, tbl, tgt, fmt) \
{ FW3_FAMILY_##f, FW3_TABLE_##tbl, FW3_FLAG_##tgt, fmt }
static const struct fw3_chain_spec zone_chains[] = {
- C(ANY, FILTER, UNSPEC, "zone_%s_input"),
- C(ANY, FILTER, UNSPEC, "zone_%s_output"),
- C(ANY, FILTER, UNSPEC, "zone_%s_forward"),
+ C(ANY, FILTER, UNSPEC, "zone_?_input"),
+ C(ANY, FILTER, UNSPEC, "zone_?_output"),
+ C(ANY, FILTER, UNSPEC, "zone_?_forward"),
- C(ANY, FILTER, SRC_ACCEPT, "zone_%s_src_ACCEPT"),
- C(ANY, FILTER, SRC_REJECT, "zone_%s_src_REJECT"),
- C(ANY, FILTER, SRC_DROP, "zone_%s_src_DROP"),
+ C(ANY, FILTER, SRC_ACCEPT, "zone_?_src_ACCEPT"),
+ C(ANY, FILTER, SRC_REJECT, "zone_?_src_REJECT"),
+ C(ANY, FILTER, SRC_DROP, "zone_?_src_DROP"),
- C(ANY, FILTER, ACCEPT, "zone_%s_dest_ACCEPT"),
- C(ANY, FILTER, REJECT, "zone_%s_dest_REJECT"),
- C(ANY, FILTER, DROP, "zone_%s_dest_DROP"),
+ C(ANY, FILTER, ACCEPT, "zone_?_dest_ACCEPT"),
+ C(ANY, FILTER, REJECT, "zone_?_dest_REJECT"),
+ C(ANY, FILTER, DROP, "zone_?_dest_DROP"),
- C(V4, NAT, SNAT, "zone_%s_postrouting"),
- C(V4, NAT, DNAT, "zone_%s_prerouting"),
+ C(V4, NAT, SNAT, "zone_?_postrouting"),
+ C(V4, NAT, DNAT, "zone_?_prerouting"),
- C(ANY, RAW, NOTRACK, "zone_%s_notrack"),
+ C(ANY, RAW, HELPER, "zone_?_helper"),
+ C(ANY, RAW, NOTRACK, "zone_?_notrack"),
- C(ANY, FILTER, CUSTOM_CHAINS, "input_%s_rule"),
- C(ANY, FILTER, CUSTOM_CHAINS, "output_%s_rule"),
- C(ANY, FILTER, CUSTOM_CHAINS, "forwarding_%s_rule"),
+ C(ANY, FILTER, CUSTOM_CHAINS, "input_?_rule"),
+ C(ANY, FILTER, CUSTOM_CHAINS, "output_?_rule"),
+ C(ANY, FILTER, CUSTOM_CHAINS, "forwarding_?_rule"),
- C(V4, NAT, CUSTOM_CHAINS, "prerouting_%s_rule"),
- C(V4, NAT, CUSTOM_CHAINS, "postrouting_%s_rule"),
+ C(V4, NAT, CUSTOM_CHAINS, "prerouting_?_rule"),
+ C(V4, NAT, CUSTOM_CHAINS, "postrouting_?_rule"),
{ }
};
+enum fw3_zone_logmask {
+ FW3_ZONE_LOG_FILTER = (1 << 0),
+ FW3_ZONE_LOG_MANGLE = (1 << 1),
+};
+
const struct fw3_option fw3_zone_opts[] = {
FW3_OPT("enabled", bool, zone, enabled),
FW3_OPT("mtu_fix", bool, zone, mtu_fix),
FW3_OPT("custom_chains", bool, zone, custom_chains),
- FW3_OPT("log", bool, zone, log),
+ FW3_OPT("log", int, zone, log),
FW3_OPT("log_limit", limit, zone, log_limit),
+ FW3_OPT("auto_helper", bool, zone, auto_helper),
+ FW3_LIST("helper", cthelper, zone, cthelpers),
+
FW3_OPT("__flags_v4", int, zone, flags[0]),
FW3_OPT("__flags_v6", int, zone, flags[1]),
{ }
};
-
static void
check_policy(struct uci_element *e, enum fw3_flag *pol, enum fw3_flag def,
const char *name)
}
}
+static bool
+check_masq_addrs(struct list_head *head)
+{
+ struct fw3_address *addr;
+ int n_addr = 0, n_failed = 0;
+
+ list_for_each_entry(addr, head, list)
+ {
+ if (addr->invert)
+ continue;
+
+ n_addr++;
+
+ if (!addr->set && addr->resolved)
+ n_failed++;
+ }
+
+ return (n_addr == 0 || n_failed < n_addr);
+}
+
static void
resolve_networks(struct uci_element *e, struct fw3_zone *zone)
{
- struct fw3_device *net, *tmp;
+ struct fw3_device *net, *dev, *tmp;
list_for_each_entry(net, &zone->networks, list)
{
continue;
}
+ list_for_each_entry(dev, &zone->devices, list)
+ if (!strcmp(dev->name, tmp->name))
+ goto alias;
+
snprintf(tmp->network, sizeof(tmp->network), "%s", net->name);
list_add_tail(&tmp->list, &zone->devices);
+ continue;
+alias:
+ free(tmp);
+ }
+}
+
+static void
+resolve_cthelpers(struct fw3_state *s, struct uci_element *e, struct fw3_zone *zone)
+{
+ struct fw3_cthelpermatch *match;
+
+ if (list_empty(&zone->cthelpers))
+ {
+ if (!zone->masq && zone->auto_helper)
+ {
+ fw3_setbit(zone->flags[0], FW3_FLAG_HELPER);
+ fw3_setbit(zone->flags[1], FW3_FLAG_HELPER);
+ }
+
+ return;
+ }
+
+ list_for_each_entry(match, &zone->cthelpers, list)
+ {
+ if (match->invert)
+ {
+ warn_elem(e, "must not use a negated helper match");
+ continue;
+ }
+
+ match->ptr = fw3_lookup_cthelper(s, match->name);
+
+ if (!match->ptr)
+ {
+ warn_elem(e, "refers to not existing helper '%s'", match->name);
+ continue;
+ }
+
+ if (fw3_is_family(match->ptr, FW3_FAMILY_V4))
+ fw3_setbit(zone->flags[0], FW3_FLAG_HELPER);
+
+ if (fw3_is_family(match->ptr, FW3_FAMILY_V6))
+ fw3_setbit(zone->flags[1], FW3_FLAG_HELPER);
}
}
INIT_LIST_HEAD(&zone->subnets);
INIT_LIST_HEAD(&zone->masq_src);
INIT_LIST_HEAD(&zone->masq_dest);
+ INIT_LIST_HEAD(&zone->cthelpers);
INIT_LIST_HEAD(&zone->old_addrs);
zone->enabled = true;
+ zone->auto_helper = true;
zone->custom_chains = true;
zone->log_limit.rate = 10;
if (!zone)
continue;
- fw3_parse_options(zone, fw3_zone_opts, s);
+ if (!fw3_parse_options(zone, fw3_zone_opts, s))
+ warn_elem(e, "has invalid options");
if (!zone->enabled)
{
if (!defs->custom_chains && zone->custom_chains)
zone->custom_chains = false;
+ if (!defs->auto_helper && zone->auto_helper)
+ zone->auto_helper = false;
+
if (!zone->name || !*zone->name)
{
warn_elem(e, "has no name - ignoring");
warn_elem(e, "has no device, network, subnet or extra options");
}
+ if (!check_masq_addrs(&zone->masq_src))
+ {
+ warn_elem(e, "has unresolved masq_src, disabling masq");
+ zone->masq = false;
+ }
+
+ if (!check_masq_addrs(&zone->masq_dest))
+ {
+ warn_elem(e, "has unresolved masq_dest, disabling masq");
+ zone->masq = false;
+ }
+
check_policy(e, &zone->policy_input, defs->policy_input, "input");
check_policy(e, &zone->policy_output, defs->policy_output, "output");
check_policy(e, &zone->policy_forward, defs->policy_forward, "forward");
fw3_setbit(zone->flags[0], FW3_FLAG_DNAT);
}
+ resolve_cthelpers(state, e, zone);
+
fw3_setbit(zone->flags[0], fw3_to_src_target(zone->policy_input));
fw3_setbit(zone->flags[0], zone->policy_forward);
fw3_setbit(zone->flags[0], zone->policy_output);
}
+static char *
+format_chain(const char *fmt, const char *zonename)
+{
+ static char chain[32];
+ size_t rem;
+ char *p;
+ int len;
+
+ for (p = chain, rem = sizeof(chain); *fmt; fmt++) {
+ if (*fmt == '?') {
+ len = snprintf(p, rem, "%s", zonename);
+
+ if (len < 0 || len >= rem)
+ break;
+
+ rem -= len;
+ p += len;
+ }
+ else {
+ if (rem <= 1)
+ break;
+
+ *p++ = *fmt;
+ rem--;
+ }
+ }
+
+ *p = 0;
+
+ return chain;
+}
+
static void
print_zone_chain(struct fw3_ipt_handle *handle, struct fw3_state *state,
bool reload, struct fw3_zone *zone)
if (!fw3_is_family(zone, handle->family))
return;
- info(" * Zone '%s'", zone->name);
-
set(zone->flags, handle->family, handle->table);
if (zone->custom_chains)
for (c = zone_chains; c->format; c++)
{
- /* don't touch user chains on selective stop */
- if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
- continue;
-
if (!fw3_is_family(c, handle->family))
continue;
!fw3_hasbit(zone->flags[handle->family == FW3_FAMILY_V6], c->flag))
continue;
- fw3_ipt_create_chain(handle, c->format, zone->name);
+ fw3_ipt_create_chain(handle, reload, format_chain(c->format, zone->name));
}
if (zone->custom_chains)
for (i = 0; i < sizeof(flt_chains)/sizeof(flt_chains[0]); i += 2)
{
r = fw3_ipt_rule_new(handle);
- fw3_ipt_rule_comment(r, "user chain for %s", flt_chains[i+1]);
+ fw3_ipt_rule_comment(r, "Custom %s %s rule chain", zone->name, flt_chains[i+1]);
fw3_ipt_rule_target(r, "%s_%s_rule", flt_chains[i+1], zone->name);
fw3_ipt_rule_append(r, "zone_%s_%s", zone->name, flt_chains[i]);
}
for (i = 0; i < sizeof(nat_chains)/sizeof(nat_chains[0]); i += 2)
{
r = fw3_ipt_rule_new(handle);
- fw3_ipt_rule_comment(r, "user chain for %s", nat_chains[i+1]);
+ fw3_ipt_rule_comment(r, "Custom %s %s rule chain", zone->name, nat_chains[i+1]);
fw3_ipt_rule_target(r, "%s_%s_rule", nat_chains[i+1], zone->name);
fw3_ipt_rule_append(r, "zone_%s_%s", zone->name, nat_chains[i]);
}
{
for (t = FW3_FLAG_ACCEPT; t <= FW3_FLAG_DROP; t++)
{
+ if (t > FW3_FLAG_ACCEPT && zone->log & FW3_ZONE_LOG_FILTER)
+ {
+ if (has(zone->flags, handle->family, fw3_to_src_target(t)))
+ {
+ r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
+
+ snprintf(buf, sizeof(buf) - 1, "%s %s in: ",
+ fw3_flag_names[t], zone->name);
+
+ fw3_ipt_rule_limit(r, &zone->log_limit);
+ fw3_ipt_rule_target(r, "LOG");
+ fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
+ fw3_ipt_rule_replace(r, "zone_%s_src_%s",
+ zone->name, fw3_flag_names[t]);
+ }
+
+ if (has(zone->flags, handle->family, t))
+ {
+ r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
+
+ snprintf(buf, sizeof(buf) - 1, "%s %s out: ",
+ fw3_flag_names[t], zone->name);
+
+ fw3_ipt_rule_limit(r, &zone->log_limit);
+ fw3_ipt_rule_target(r, "LOG");
+ fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
+ fw3_ipt_rule_replace(r, "zone_%s_dest_%s",
+ zone->name, fw3_flag_names[t]);
+ }
+ }
+
if (has(zone->flags, handle->family, fw3_to_src_target(t)))
{
r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
{
if (zone->mtu_fix)
{
- if (zone->log)
+ if (zone->log & FW3_ZONE_LOG_MANGLE)
{
- snprintf(buf, sizeof(buf) - 1, "MSSFIX(%s): ", zone->name);
+ snprintf(buf, sizeof(buf) - 1, "MSSFIX %s out: ", zone->name);
r = fw3_ipt_rule_create(handle, &tcp, NULL, dev, NULL, sub);
fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
fw3_ipt_rule_addarg(r, false, "SYN", NULL);
fw3_ipt_rule_limit(r, &zone->log_limit);
- fw3_ipt_rule_comment(r, "%s (mtu_fix logging)", zone->name);
+ fw3_ipt_rule_comment(r, "Zone %s MTU fix logging", zone->name);
fw3_ipt_rule_target(r, "LOG");
fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
fw3_ipt_rule_replace(r, "FORWARD");
r = fw3_ipt_rule_create(handle, &tcp, NULL, dev, NULL, sub);
fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
fw3_ipt_rule_addarg(r, false, "SYN", NULL);
- fw3_ipt_rule_comment(r, "%s (mtu_fix)", zone->name);
+ fw3_ipt_rule_comment(r, "Zone %s MTU fixing", zone->name);
+ fw3_ipt_rule_target(r, "TCPMSS");
+ fw3_ipt_rule_addarg(r, false, "--clamp-mss-to-pmtu", NULL);
+ fw3_ipt_rule_replace(r, "FORWARD");
+
+ r = fw3_ipt_rule_create(handle, &tcp, dev, NULL, sub, NULL);
+ fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
+ fw3_ipt_rule_addarg(r, false, "SYN", NULL);
+ fw3_ipt_rule_comment(r, "Zone %s MTU fixing", zone->name);
fw3_ipt_rule_target(r, "TCPMSS");
fw3_ipt_rule_addarg(r, false, "--clamp-mss-to-pmtu", NULL);
fw3_ipt_rule_replace(r, "FORWARD");
}
else if (handle->table == FW3_TABLE_RAW)
{
+ bool loopback_dev = (dev != NULL && !dev->any &&
+ !dev->invert && fw3_check_loopback_dev(dev->name));
+ char *chain = loopback_dev || (sub != NULL && !sub->invert && fw3_check_loopback_addr(sub)) ?
+ "OUTPUT" : "PREROUTING";
+
+ if (has(zone->flags, handle->family, FW3_FLAG_HELPER))
+ {
+ r = fw3_ipt_rule_create(handle, NULL, loopback_dev ? NULL : dev, NULL, sub, NULL);
+ fw3_ipt_rule_comment(r, "%s CT helper assignment", zone->name);
+ fw3_ipt_rule_target(r, "zone_%s_helper", zone->name);
+ fw3_ipt_rule_extra(r, zone->extra_src);
+ fw3_ipt_rule_replace(r, chain);
+ }
+
if (has(zone->flags, handle->family, FW3_FLAG_NOTRACK))
{
- r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
+ r = fw3_ipt_rule_create(handle, NULL, loopback_dev ? NULL : dev, NULL, sub, NULL);
+ fw3_ipt_rule_comment(r, "%s CT bypass", zone->name);
fw3_ipt_rule_target(r, "zone_%s_notrack", zone->name);
fw3_ipt_rule_extra(r, zone->extra_src);
- fw3_ipt_rule_replace(r, "PREROUTING");
+ fw3_ipt_rule_replace(r, chain);
}
}
}
if (!fw3_is_family(sub, handle->family))
continue;
- if (!dev && !sub)
+ if (!dev && !sub && !zone->extra_src && !zone->extra_dest)
continue;
print_interface_rule(handle, state, reload, zone, dev, sub);
{
rv = list_entry(p, struct fw3_address, list);
- if (fw3_is_family(rv, family) && rv->invert == invert)
+ if (fw3_is_family(rv, family) && rv->set && rv->invert == invert)
return rv;
}
struct fw3_address *mdest;
struct fw3_ipt_rule *r;
- enum fw3_flag t;
- char buf[32];
-
if (!fw3_is_family(zone, handle->family))
return;
+ info(" * Zone '%s'", zone->name);
+
switch (handle->table)
{
case FW3_TABLE_FILTER:
fw3_flag_names[zone->policy_output]);
fw3_ipt_rule_append(r, "zone_%s_output", zone->name);
- if (zone->log)
- {
- for (t = FW3_FLAG_REJECT; t <= FW3_FLAG_DROP; t++)
- {
- if (has(zone->flags, handle->family, fw3_to_src_target(t)))
- {
- r = fw3_ipt_rule_new(handle);
-
- snprintf(buf, sizeof(buf) - 1, "%s(src %s)",
- fw3_flag_names[t], zone->name);
-
- fw3_ipt_rule_limit(r, &zone->log_limit);
- fw3_ipt_rule_target(r, "LOG");
- fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
- fw3_ipt_rule_append(r, "zone_%s_src_%s",
- zone->name, fw3_flag_names[t]);
- }
-
- if (has(zone->flags, handle->family, t))
- {
- r = fw3_ipt_rule_new(handle);
-
- snprintf(buf, sizeof(buf) - 1, "%s(dest %s)",
- fw3_flag_names[t], zone->name);
-
- fw3_ipt_rule_limit(r, &zone->log_limit);
- fw3_ipt_rule_target(r, "LOG");
- fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
- fw3_ipt_rule_append(r, "zone_%s_dest_%s",
- zone->name, fw3_flag_names[t]);
- }
- }
- }
break;
case FW3_TABLE_NAT:
break;
case FW3_TABLE_RAW:
+ fw3_print_cthelpers(handle, state, zone);
+ break;
+
case FW3_TABLE_MANGLE:
break;
}
{
struct fw3_zone *z, *tmp;
const struct fw3_chain_spec *c;
- char chain[32];
list_for_each_entry_safe(z, tmp, &state->zones, list)
{
if (!has(z->flags, handle->family, handle->table))
continue;
+ /* first flush all rules ... */
for (c = zone_chains; c->format; c++)
{
/* don't touch user chains on selective stop */
if (c->flag && !has(z->flags, handle->family, c->flag))
continue;
- snprintf(chain, sizeof(chain), c->format, z->name);
- fw3_ipt_flush_chain(handle, chain);
+ fw3_ipt_flush_chain(handle, format_chain(c->format, z->name));
+ }
- /* keep certain basic chains that do not depend on any settings to
- avoid purging unrelated user rules pointing to them */
- if (reload && !c->flag)
+ /* ... then remove the chains */
+ for (c = zone_chains; c->format; c++)
+ {
+ if (!fw3_is_family(c, handle->family))
+ continue;
+
+ if (c->table != handle->table)
+ continue;
+
+ if (c->flag && !has(z->flags, handle->family, c->flag))
continue;
- fw3_ipt_delete_chain(handle, chain);
+ fw3_ipt_delete_chain(handle, reload,
+ format_chain(c->format, z->name));
}
del(z->flags, handle->family, handle->table);