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- /*
- * firewall3 - 3rd OpenWrt UCI firewall implementation
- *
- * Copyright (C) 2013 Jo-Philipp Wich <jo@mein.io>
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
- #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_?_input"),
- C(ANY, FILTER, UNSPEC, "zone_?_output"),
- C(ANY, FILTER, UNSPEC, "zone_?_forward"),
- 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_?_dest_ACCEPT"),
- C(ANY, FILTER, REJECT, "zone_?_dest_REJECT"),
- C(ANY, FILTER, DROP, "zone_?_dest_DROP"),
- C(V4, NAT, SNAT, "zone_?_postrouting"),
- C(V4, NAT, DNAT, "zone_?_prerouting"),
- C(ANY, RAW, HELPER, "zone_?_helper"),
- C(ANY, RAW, NOTRACK, "zone_?_notrack"),
- 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_?_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("name", string, zone, name),
- FW3_OPT("family", family, zone, family),
- FW3_LIST("network", device, zone, networks),
- FW3_LIST("device", device, zone, devices),
- FW3_LIST("subnet", network, zone, subnets),
- FW3_OPT("input", target, zone, policy_input),
- FW3_OPT("forward", target, zone, policy_forward),
- FW3_OPT("output", target, zone, policy_output),
- FW3_OPT("masq", bool, zone, masq),
- FW3_OPT("masq_allow_invalid", bool, zone, masq_allow_invalid),
- FW3_LIST("masq_src", network, zone, masq_src),
- FW3_LIST("masq_dest", network, zone, masq_dest),
- FW3_OPT("extra", string, zone, extra_src),
- FW3_OPT("extra_src", string, zone, extra_src),
- FW3_OPT("extra_dest", string, zone, extra_dest),
- FW3_OPT("mtu_fix", bool, zone, mtu_fix),
- FW3_OPT("custom_chains", bool, zone, custom_chains),
- 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]),
- FW3_LIST("__addrs", address, zone, old_addrs),
- { }
- };
- static void
- check_policy(struct uci_element *e, enum fw3_flag *pol, enum fw3_flag def,
- const char *name)
- {
- if (*pol == FW3_FLAG_UNSPEC)
- {
- warn_elem(e, "has no %s policy specified, using default", name);
- *pol = def;
- }
- else if (*pol > FW3_FLAG_DROP)
- {
- warn_elem(e, "has invalid %s policy, using default", name);
- *pol = def;
- }
- }
- 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, *dev, *tmp;
- list_for_each_entry(net, &zone->networks, list)
- {
- tmp = fw3_ubus_device(net->name);
- if (!tmp)
- {
- warn_elem(e, "cannot resolve device of network '%s'", net->name);
- 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);
- }
- }
- struct fw3_zone *
- fw3_alloc_zone(void)
- {
- struct fw3_zone *zone;
- zone = calloc(1, sizeof(*zone));
- if (!zone)
- return NULL;
- INIT_LIST_HEAD(&zone->networks);
- INIT_LIST_HEAD(&zone->devices);
- 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;
- return zone;
- }
- void
- fw3_load_zones(struct fw3_state *state, struct uci_package *p)
- {
- struct uci_section *s;
- struct uci_element *e;
- struct fw3_zone *zone;
- struct fw3_defaults *defs = &state->defaults;
- INIT_LIST_HEAD(&state->zones);
- uci_foreach_element(&p->sections, e)
- {
- s = uci_to_section(e);
- if (strcmp(s->type, "zone"))
- continue;
- zone = fw3_alloc_zone();
- if (!zone)
- continue;
- if (!fw3_parse_options(zone, fw3_zone_opts, s))
- warn_elem(e, "has invalid options");
- if (!zone->enabled)
- {
- fw3_free_zone(zone);
- continue;
- }
- if (!zone->extra_dest)
- zone->extra_dest = zone->extra_src;
- 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");
- fw3_free_zone(zone);
- continue;
- }
- if (strlen(zone->name) > FW3_ZONE_MAXNAMELEN)
- {
- warn_elem(e, "must not have a name longer than %u characters",
- FW3_ZONE_MAXNAMELEN);
- fw3_free_zone(zone);
- continue;
- }
- fw3_ubus_zone_devices(zone);
- if (list_empty(&zone->networks) && list_empty(&zone->devices) &&
- list_empty(&zone->subnets) && !zone->extra_src)
- {
- 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");
- resolve_networks(e, zone);
- if (zone->masq)
- {
- fw3_setbit(zone->flags[0], FW3_FLAG_SNAT);
- }
- if (zone->custom_chains)
- {
- fw3_setbit(zone->flags[0], FW3_FLAG_SNAT);
- 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);
- fw3_setbit(zone->flags[1], fw3_to_src_target(zone->policy_input));
- fw3_setbit(zone->flags[1], zone->policy_forward);
- fw3_setbit(zone->flags[1], zone->policy_output);
- list_add_tail(&zone->list, &state->zones);
- }
- }
- 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)
- {
- int i;
- struct fw3_ipt_rule *r;
- const struct fw3_chain_spec *c;
- const char *flt_chains[] = {
- "input", "input",
- "output", "output",
- "forward", "forwarding",
- };
- const char *nat_chains[] = {
- "prerouting", "prerouting",
- "postrouting", "postrouting",
- };
- if (!fw3_is_family(zone, handle->family))
- return;
- set(zone->flags, handle->family, handle->table);
- if (zone->custom_chains)
- set(zone->flags, handle->family, FW3_FLAG_CUSTOM_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 &&
- !fw3_hasbit(zone->flags[handle->family == FW3_FAMILY_V6], c->flag))
- continue;
- fw3_ipt_create_chain(handle, reload, format_chain(c->format, zone->name));
- }
- if (zone->custom_chains)
- {
- if (handle->table == FW3_TABLE_FILTER)
- {
- for (i = 0; i < sizeof(flt_chains)/sizeof(flt_chains[0]); i += 2)
- {
- r = fw3_ipt_rule_new(handle);
- 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]);
- }
- }
- else if (handle->table == FW3_TABLE_NAT)
- {
- for (i = 0; i < sizeof(nat_chains)/sizeof(nat_chains[0]); i += 2)
- {
- r = fw3_ipt_rule_new(handle);
- 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]);
- }
- }
- }
- set(zone->flags, handle->family, handle->table);
- }
- static void
- print_interface_rule(struct fw3_ipt_handle *handle, struct fw3_state *state,
- bool reload, struct fw3_zone *zone,
- struct fw3_device *dev, struct fw3_address *sub)
- {
- struct fw3_protocol tcp = { .protocol = 6 };
- struct fw3_ipt_rule *r;
- enum fw3_flag t;
- char buf[32];
- int i;
- const char *chains[] = {
- "input", "INPUT",
- "output", "OUTPUT",
- "forward", "FORWARD",
- };
- #define jump_target(t) \
- ((t == FW3_FLAG_REJECT) ? "reject" : fw3_flag_names[t])
- if (handle->table == FW3_TABLE_FILTER)
- {
- 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);
- fw3_ipt_rule_target(r, jump_target(t));
- fw3_ipt_rule_extra(r, zone->extra_src);
- if (t == FW3_FLAG_ACCEPT && !state->defaults.drop_invalid)
- fw3_ipt_rule_extra(r,
- "-m conntrack --ctstate NEW,UNTRACKED");
- fw3_ipt_rule_replace(r, "zone_%s_src_%s", zone->name,
- fw3_flag_names[t]);
- }
- if (has(zone->flags, handle->family, t))
- {
- if (t == FW3_FLAG_ACCEPT &&
- zone->masq && !zone->masq_allow_invalid)
- {
- r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
- fw3_ipt_rule_extra(r, "-m conntrack --ctstate INVALID");
- fw3_ipt_rule_comment(r, "Prevent NAT leakage");
- fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_DROP]);
- fw3_ipt_rule_replace(r, "zone_%s_dest_%s", zone->name,
- fw3_flag_names[t]);
- }
- r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
- fw3_ipt_rule_target(r, jump_target(t));
- fw3_ipt_rule_extra(r, zone->extra_dest);
- fw3_ipt_rule_replace(r, "zone_%s_dest_%s", zone->name,
- fw3_flag_names[t]);
- }
- }
- for (i = 0; i < sizeof(chains)/sizeof(chains[0]); i += 2)
- {
- if (*chains[i] == 'o')
- r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
- else
- r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
- fw3_ipt_rule_target(r, "zone_%s_%s", zone->name, chains[i]);
- if (*chains[i] == 'o')
- fw3_ipt_rule_extra(r, zone->extra_dest);
- else
- fw3_ipt_rule_extra(r, zone->extra_src);
- fw3_ipt_rule_replace(r, chains[i + 1]);
- }
- }
- else if (handle->table == FW3_TABLE_NAT)
- {
- if (has(zone->flags, handle->family, FW3_FLAG_DNAT))
- {
- r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
- fw3_ipt_rule_target(r, "zone_%s_prerouting", zone->name);
- fw3_ipt_rule_extra(r, zone->extra_src);
- fw3_ipt_rule_replace(r, "PREROUTING");
- }
- if (has(zone->flags, handle->family, FW3_FLAG_SNAT))
- {
- r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
- fw3_ipt_rule_target(r, "zone_%s_postrouting", zone->name);
- fw3_ipt_rule_extra(r, zone->extra_dest);
- fw3_ipt_rule_replace(r, "POSTROUTING");
- }
- }
- else if (handle->table == FW3_TABLE_MANGLE)
- {
- if (zone->mtu_fix)
- {
- if (zone->log & FW3_ZONE_LOG_MANGLE)
- {
- 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, "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, "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, 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, chain);
- }
- }
- }
- static void
- print_interface_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
- bool reload, struct fw3_zone *zone)
- {
- struct fw3_device *dev;
- struct fw3_address *sub;
- fw3_foreach(dev, &zone->devices)
- fw3_foreach(sub, &zone->subnets)
- {
- if (!fw3_is_family(sub, handle->family))
- continue;
- if (!dev && !sub && !zone->extra_src && !zone->extra_dest)
- continue;
- print_interface_rule(handle, state, reload, zone, dev, sub);
- }
- }
- static struct fw3_address *
- next_addr(struct fw3_address *addr, struct list_head *list,
- enum fw3_family family, bool invert)
- {
- struct list_head *p;
- struct fw3_address *rv;
- for (p = addr ? addr->list.next : list->next; p != list; p = p->next)
- {
- rv = list_entry(p, struct fw3_address, list);
- if (fw3_is_family(rv, family) && rv->set && rv->invert == invert)
- return rv;
- }
- return NULL;
- }
- static void
- print_zone_rule(struct fw3_ipt_handle *handle, struct fw3_state *state,
- bool reload, struct fw3_zone *zone)
- {
- bool first_src, first_dest;
- struct fw3_address *msrc;
- struct fw3_address *mdest;
- struct fw3_ipt_rule *r;
- if (!fw3_is_family(zone, handle->family))
- return;
- info(" * Zone '%s'", zone->name);
- switch (handle->table)
- {
- case FW3_TABLE_FILTER:
- if (has(zone->flags, handle->family, FW3_FLAG_DNAT))
- {
- r = fw3_ipt_rule_new(handle);
- fw3_ipt_rule_extra(r, "-m conntrack --ctstate DNAT");
- fw3_ipt_rule_comment(r, "Accept port redirections");
- fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_ACCEPT]);
- fw3_ipt_rule_append(r, "zone_%s_input", zone->name);
- r = fw3_ipt_rule_new(handle);
- fw3_ipt_rule_extra(r, "-m conntrack --ctstate DNAT");
- fw3_ipt_rule_comment(r, "Accept port forwards");
- fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_ACCEPT]);
- fw3_ipt_rule_append(r, "zone_%s_forward", zone->name);
- }
- r = fw3_ipt_rule_new(handle);
- fw3_ipt_rule_target(r, "zone_%s_src_%s", zone->name,
- fw3_flag_names[zone->policy_input]);
- fw3_ipt_rule_append(r, "zone_%s_input", zone->name);
- r = fw3_ipt_rule_new(handle);
- fw3_ipt_rule_target(r, "zone_%s_dest_%s", zone->name,
- fw3_flag_names[zone->policy_forward]);
- fw3_ipt_rule_append(r, "zone_%s_forward", zone->name);
- r = fw3_ipt_rule_new(handle);
- fw3_ipt_rule_target(r, "zone_%s_dest_%s", zone->name,
- fw3_flag_names[zone->policy_output]);
- fw3_ipt_rule_append(r, "zone_%s_output", zone->name);
- break;
- case FW3_TABLE_NAT:
- if (zone->masq && handle->family == FW3_FAMILY_V4)
- {
- /* for any negated masq_src ip, emit -s addr -j RETURN rules */
- for (msrc = NULL;
- (msrc = next_addr(msrc, &zone->masq_src,
- handle->family, true)) != NULL; )
- {
- msrc->invert = false;
- r = fw3_ipt_rule_new(handle);
- fw3_ipt_rule_src_dest(r, msrc, NULL);
- fw3_ipt_rule_target(r, "RETURN");
- fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
- msrc->invert = true;
- }
- /* for any negated masq_dest ip, emit -d addr -j RETURN rules */
- for (mdest = NULL;
- (mdest = next_addr(mdest, &zone->masq_dest,
- handle->family, true)) != NULL; )
- {
- mdest->invert = false;
- r = fw3_ipt_rule_new(handle);
- fw3_ipt_rule_src_dest(r, NULL, mdest);
- fw3_ipt_rule_target(r, "RETURN");
- fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
- mdest->invert = true;
- }
- /* emit masquerading entries for non-negated addresses
- and ensure that both src and dest loops run at least once,
- even if there are no relevant addresses */
- for (first_src = true, msrc = NULL;
- (msrc = next_addr(msrc, &zone->masq_src,
- handle->family, false)) || first_src;
- first_src = false)
- {
- for (first_dest = true, mdest = NULL;
- (mdest = next_addr(mdest, &zone->masq_dest,
- handle->family, false)) || first_dest;
- first_dest = false)
- {
- r = fw3_ipt_rule_new(handle);
- fw3_ipt_rule_src_dest(r, msrc, mdest);
- fw3_ipt_rule_target(r, "MASQUERADE");
- fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
- }
- }
- }
- break;
- case FW3_TABLE_RAW:
- fw3_print_cthelpers(handle, state, zone);
- break;
- case FW3_TABLE_MANGLE:
- break;
- }
- print_interface_rules(handle, state, reload, zone);
- }
- void
- fw3_print_zone_chains(struct fw3_ipt_handle *handle, struct fw3_state *state,
- bool reload)
- {
- struct fw3_zone *zone;
- list_for_each_entry(zone, &state->zones, list)
- print_zone_chain(handle, state, reload, zone);
- }
- void
- fw3_print_zone_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
- bool reload)
- {
- struct fw3_zone *zone;
- list_for_each_entry(zone, &state->zones, list)
- print_zone_rule(handle, state, reload, zone);
- }
- void
- fw3_flush_zones(struct fw3_ipt_handle *handle, struct fw3_state *state,
- bool reload)
- {
- struct fw3_zone *z, *tmp;
- const struct fw3_chain_spec *c;
- 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 (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
- continue;
- 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_flush_chain(handle, format_chain(c->format, z->name));
- }
- /* ... 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, reload,
- format_chain(c->format, z->name));
- }
- del(z->flags, handle->family, handle->table);
- }
- }
- void
- fw3_hotplug_zones(struct fw3_state *state, bool add)
- {
- struct fw3_zone *z;
- struct fw3_device *d;
- list_for_each_entry(z, &state->zones, list)
- {
- if (add != fw3_hasbit(z->flags[0], FW3_FLAG_HOTPLUG))
- {
- list_for_each_entry(d, &z->devices, list)
- fw3_hotplug(add, z, d);
- if (add)
- fw3_setbit(z->flags[0], FW3_FLAG_HOTPLUG);
- else
- fw3_delbit(z->flags[0], FW3_FLAG_HOTPLUG);
- }
- }
- }
- struct fw3_zone *
- fw3_lookup_zone(struct fw3_state *state, const char *name)
- {
- struct fw3_zone *z;
- if (list_empty(&state->zones))
- return NULL;
- list_for_each_entry(z, &state->zones, list)
- {
- if (strcmp(z->name, name))
- continue;
- return z;
- }
- return NULL;
- }
- struct list_head *
- fw3_resolve_zone_addresses(struct fw3_zone *zone, struct fw3_address *addr)
- {
- struct fw3_device *net;
- struct fw3_address *cur, *tmp;
- struct list_head *all;
- all = calloc(1, sizeof(*all));
- if (!all)
- return NULL;
- INIT_LIST_HEAD(all);
- if (addr && addr->set)
- {
- tmp = malloc(sizeof(*tmp));
- if (tmp)
- {
- *tmp = *addr;
- list_add_tail(&tmp->list, all);
- }
- }
- else
- {
- list_for_each_entry(net, &zone->networks, list)
- fw3_ubus_address(all, net->name);
- list_for_each_entry(cur, &zone->subnets, list)
- {
- tmp = malloc(sizeof(*tmp));
- if (!tmp)
- continue;
- *tmp = *cur;
- list_add_tail(&tmp->list, all);
- }
- }
- return all;
- }
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