#include "fwd.h"
#include "fwd_addr.h"
#include "fwd_rules.h"
+#include "fwd_xtables.h"
static void
fwd_ipt_rule_append(struct fwd_ipt_rulebuf *r, const char *fmt, ...)
}
}
+static void fwd_ipt_add_policy_target(
+ struct fwd_ipt_rulebuf *r, enum fwd_policy p
+) {
+ fwd_ipt_rule_append(r, " -j %s",
+ (p == FWD_P_ACCEPT)
+ ? "handle_accept"
+ : (p == FWD_P_REJECT)
+ ? "handle_reject"
+ : "handle_drop"
+ );
+}
+
+static void fwd_ipt_add_comment(
+ struct fwd_ipt_rulebuf *r, const char *t, struct fwd_zone *z,
+ struct fwd_network_list *n, struct fwd_network_list *n2
+) {
+ if( (n != NULL) && (n2 != NULL) )
+ fwd_ipt_add_format(r, " -m comment --comment '%s:%s src:%s dest:%s'",
+ t, z->name, n->name, n2->name);
+ else if( (n == NULL) && (n2 != NULL) )
+ fwd_ipt_add_format(r, " -m comment --comment '%s:%s dest:%s'",
+ t, z->name, n2->name);
+ else
+ fwd_ipt_add_format(r, " -m comment --comment '%s:%s src:%s'",
+ t, z->name, n->name);
+}
+
static void fwd_ipt_exec(struct fwd_ipt_rulebuf *r)
{
if( r->len )
fwd_free_ptr(r);
}
-static const char * fwd_str_policy(enum fwd_policy pol)
-{
- return (pol == FWD_P_ACCEPT ? "ACCEPT" : "DROP");
+/* -P <chain> <policy> */
+static void fwd_r_set_policy(
+ struct iptc_handle *h, const char *chain, const char *policy
+) {
+ iptc_set_policy(chain, policy, NULL, h);
}
-static const char * fwd_str_target(enum fwd_policy pol)
+/* -N <chain> */
+static void fwd_r_new_chain(struct iptc_handle *h, const char *chain)
{
- switch(pol)
- {
- case FWD_P_ACCEPT:
- return "ACCEPT";
+ iptc_create_chain(chain, h);
+}
- case FWD_P_REJECT:
- return "REJECT";
+/* -A <chain1> -j <chain2> */
+static void fwd_r_jump_chain(
+ struct iptc_handle *h, const char *chain1, const char *chain2
+) {
+ struct fwd_xt_rule *r;
- default:
- return "DROP";
+ if( (r = fwd_xt_init_rule(h)) != NULL )
+ {
+ fwd_xt_get_target(r, chain2);
+ fwd_xt_exec_rule(r, chain1);
}
-
- return "DROP";
}
-
-static void fwd_ipt_defaults_create(struct fwd_data *d)
+/* -A <chain> -m state --state INVALID -j DROP */
+static void fwd_r_drop_invalid(struct iptc_handle *h, const char *chain)
{
- struct fwd_defaults *def = &d->section.defaults;
-
- /* policies */
- fwd_ipt_exec_format("filter", " -P INPUT %s", fwd_str_policy(def->input));
- fwd_ipt_exec_format("filter", " -P OUTPUT %s", fwd_str_policy(def->output));
- fwd_ipt_exec_format("filter", " -P FORWARD %s", fwd_str_policy(def->forward));
+ struct fwd_xt_rule *r;
+ struct xtables_match *m;
- /* invalid state drop */
- if( def->drop_invalid )
+ if( (r = fwd_xt_init_rule(h)) != NULL )
{
- fwd_ipt_exec_format("filter", " -A INPUT --state INVALID -j DROP");
- fwd_ipt_exec_format("filter", " -A OUTPUT --state INVALID -j DROP");
- fwd_ipt_exec_format("filter", " -A FORWARD --state INVALID -j DROP");
+ if( (m = fwd_xt_get_match(r, "state")) != NULL )
+ {
+ fwd_xt_parse_match(r, m, "--state", "INVALID", 0);
+ fwd_xt_get_target(r, "DROP");
+ fwd_xt_exec_rule(r, chain);
+ }
}
+}
- /* default accept related */
- fwd_ipt_exec_format("filter", " -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT");
- fwd_ipt_exec_format("filter", " -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT");
- fwd_ipt_exec_format("filter", " -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT");
-
- /* default accept on lo */
- fwd_ipt_exec_format("filter", " -A INPUT -i lo -j ACCEPT");
- fwd_ipt_exec_format("filter", " -A OUTPUT -o lo -j ACCEPT");
+/* -A <chain> -m state --state RELATED,ESTABLISHED -j ACCEPT */
+static void fwd_r_accept_related(struct iptc_handle *h, const char *chain)
+{
+ struct fwd_xt_rule *r;
+ struct xtables_match *m;
- /* syn flood protection */
- if( def->syn_flood )
+ if( (r = fwd_xt_init_rule(h)) != NULL )
{
- fwd_ipt_exec_format("filter", " -N syn_flood");
+ if( (m = fwd_xt_get_match(r, "state")) != NULL )
+ {
+ fwd_xt_parse_match(r, m, "--state", "RELATED,ESTABLISHED", 0);
+ fwd_xt_get_target(r, "ACCEPT");
+ fwd_xt_exec_rule(r, chain);
+ }
+ }
+}
- fwd_ipt_exec_format("filter",
- " -A syn_flood -p tcp --syn -m limit --limit %i/second"
- " --limit-burst %i -j RETURN",
- def->syn_rate, def->syn_burst);
+/* -A INPUT -i lo -j ACCEPT; -A OUTPUT -o lo -j ACCEPT */
+static void fwd_r_accept_lo(struct iptc_handle *h)
+{
+ struct fwd_network_list n;
+ struct fwd_xt_rule *r;
- fwd_ipt_exec_format("filter", " -A syn_flood -j DROP");
- fwd_ipt_exec_format("filter", " -A INPUT -p tcp --syn -j syn_flood");
+ n.ifname = "lo";
+
+ if( (r = fwd_xt_init_rule(h)) != NULL )
+ {
+ fwd_xt_parse_in(r, &n, 0);
+ fwd_xt_get_target(r, "ACCEPT");
+ fwd_xt_exec_rule(r, "INPUT");
}
- /* standard input/output/forward chain */
- fwd_ipt_exec_format("filter", " -N input");
- fwd_ipt_exec_format("filter", " -N output");
- fwd_ipt_exec_format("filter", " -N forward");
- fwd_ipt_exec_format("filter", " -A INPUT -j input");
- fwd_ipt_exec_format("filter", " -A OUTPUT -j output");
- fwd_ipt_exec_format("filter", " -A FORWARD -j forward");
-
- /* standard reject chain */
- fwd_ipt_exec_format("filter", " -N reject");
- fwd_ipt_exec_format("filter", " -A reject -p tcp -j REJECT --reject-with tcp-reset");
- fwd_ipt_exec_format("filter", " -A reject -j REJECT --reject-with icmp-port-unreachable");
+ if( (r = fwd_xt_init_rule(h)) != NULL )
+ {
+ fwd_xt_parse_out(r, &n, 0);
+ fwd_xt_get_target(r, "ACCEPT");
+ fwd_xt_exec_rule(r, "OUTPUT");
+ }
}
-static void fwd_ipt_zone_create(struct fwd_data *d)
+/* build syn_flood chain and jump rule */
+static void fwd_r_add_synflood(struct iptc_handle *h, struct fwd_defaults *def)
{
- struct fwd_zone *z = &d->section.zone;
+ struct fwd_proto p;
+ struct fwd_xt_rule *r;
+ struct xtables_match *m;
+ char buf[32];
- if( !strcmp(z->name, "loopback") )
- return;
+ /* -N syn_flood */
+ fwd_r_new_chain(h, "syn_flood");
+
+ /* return rule */
+ if( (r = fwd_xt_init_rule(h)) != NULL )
+ {
+ /* -p tcp */
+ p.type = FWD_PR_TCP;
+ fwd_xt_parse_proto(r, &p, 0);
- fwd_ipt_exec_format("filter", " -N zone_%s", z->name);
- fwd_ipt_exec_format("filter", " -N zone_%s_forward", z->name);
- fwd_ipt_exec_format("filter", " -N zone_%s_ACCEPT", z->name);
- fwd_ipt_exec_format("filter", " -N zone_%s_REJECT", z->name);
- fwd_ipt_exec_format("filter", " -N zone_%s_DROP", z->name);
- fwd_ipt_exec_format("filter", " -N zone_%s_MSSFIX", z->name);
+ /* -m tcp --syn */
+ if( (m = fwd_xt_get_match(r, "tcp")) != NULL )
+ {
+ fwd_xt_parse_match(r, m, "--syn", NULL, 0);
+ }
- if( z->forward != FWD_P_UNSPEC )
- fwd_ipt_exec_format("filter", " -A zone_%s_forward -j zone_%s_%s",
- z->name, z->name, fwd_str_target(z->forward));
+ /* -m limit --limit x/second --limit-burst y */
+ if( (m = fwd_xt_get_match(r, "limit")) != NULL )
+ {
+ sprintf(buf, "%i/second", def->syn_rate);
+ fwd_xt_parse_match(r, m, "--limit", buf, 0);
- if( z->input != FWD_P_UNSPEC )
- fwd_ipt_exec_format("filter", " -A zone_%s -j zone_%s_%s",
- z->name, z->name, fwd_str_target(z->input));
+ sprintf(buf, "%i", def->syn_burst);
+ fwd_xt_parse_match(r, m, "--limit-burst", buf, 0);
+ }
- if( z->output != FWD_P_UNSPEC )
- fwd_ipt_exec_format("filter", " -A output -j zone_%s_%s",
- z->name, fwd_str_target(z->output));
+ /* -j RETURN; -A syn_flood */
+ fwd_xt_get_target(r, "RETURN");
+ fwd_xt_exec_rule(r, "syn_flood");
+ }
- fwd_ipt_exec_format("nat", " -N zone_%s_nat", z->name);
- fwd_ipt_exec_format("nat", " -N zone_%s_prerouting", z->name);
- fwd_ipt_exec_format("raw", " -N zone_%s_notrack", z->name);
+ /* drop rule */
+ if( (r = fwd_xt_init_rule(h)) != NULL )
+ {
+ /* -j DROP; -A syn_flood */
+ fwd_xt_get_target(r, "DROP");
+ fwd_xt_exec_rule(r, "syn_flood");
+ }
- if( z->masq )
- fwd_ipt_exec_format("nat", " -A POSTROUTING -j zone_%s_nat",
- z->name);
+ /* jump to syn_flood rule */
+ if( (r = fwd_xt_init_rule(h)) != NULL )
+ {
+ /* -p tcp */
+ p.type = FWD_PR_TCP;
+ fwd_xt_parse_proto(r, &p, 0);
- if( z->mtu_fix )
- fwd_ipt_exec_format("filter", " -A FORWARD -j zone_%s_MSSFIX",
- z->name);
+ /* -m tcp --syn */
+ if( (m = fwd_xt_get_match(r, "tcp")) != NULL )
+ {
+ fwd_xt_parse_match(r, m, "--syn", NULL, 0);
+ }
+
+ /* -j syn_flood; -A INPUT */
+ fwd_xt_get_target(r, "syn_flood");
+ fwd_xt_exec_rule(r, "INPUT");
+ }
}
-static void fwd_ipt_forwarding_create(struct fwd_data *d)
+/* build reject target chain */
+static void fwd_r_handle_reject(struct iptc_handle *h)
{
- struct fwd_forwarding *f = &d->section.forwarding;
- struct fwd_ipt_rulebuf *b;
+ struct fwd_proto p;
+ struct fwd_xt_rule *r;
+ struct xtables_target *t;
- b = fwd_ipt_init("filter");
+ /* -N handle_reject */
+ fwd_r_new_chain(h, "handle_reject");
- if( f->src )
- fwd_ipt_add_format(b, " -I zone_%s_forward 1", f->src->name);
- else
- fwd_ipt_add_format(b, " -I forward 1");
+ /* tcp reject rule */
+ if( (r = fwd_xt_init_rule(h)) != NULL )
+ {
+ /* -p tcp */
+ p.type = FWD_PR_TCP;
+ fwd_xt_parse_proto(r, &p, 0);
- if( f->dest )
- fwd_ipt_add_format(b, " -j zone_%s_ACCEPT", f->dest->name);
- else
- fwd_ipt_add_format(b, " -j ACCEPT");
+ /* -j REJECT --reject-with tcp-reset */
+ if( (t = fwd_xt_get_target(r, "REJECT")) != NULL )
+ {
+ fwd_xt_parse_target(r, t, "--reject-with", "tcp-reset", 0);
+ }
+
+ /* -A handle_reject */
+ fwd_xt_exec_rule(r, "handle_reject");
+ }
+
+ /* common reject rule */
+ if( (r = fwd_xt_init_rule(h)) != NULL )
+ {
+ /* -j REJECT --reject-with icmp-port-unreachable */
+ if( (t = fwd_xt_get_target(r, "REJECT")) != NULL )
+ {
+ fwd_xt_parse_target(r, t, "--reject-with",
+ "icmp-port-unreachable", 0);
+ }
- fwd_ipt_exec(b);
+ /* -A handle_reject */
+ fwd_xt_exec_rule(r, "handle_reject");
+ }
}
-static void fwd_ipt_redirect_create(struct fwd_data *d)
+/* build drop target chain */
+static void fwd_r_handle_drop(struct iptc_handle *h)
{
- struct fwd_redirect *r = &d->section.redirect;
- struct fwd_ipt_rulebuf *b;
+ struct fwd_xt_rule *r;
+
+ /* -N handle_drop */
+ fwd_r_new_chain(h, "handle_drop");
- b = fwd_ipt_init("nat");
- fwd_ipt_add_format(b, " -A zone_%s_prerouting", r->src->name);
- fwd_ipt_add_proto(b, r->proto);
- fwd_ipt_add_srcaddr(b, r->src_ip);
- fwd_ipt_add_srcport(b, r->src_port);
- fwd_ipt_add_destport(b, r->src_dport);
- fwd_ipt_add_srcmac(b, r->src_mac);
- fwd_ipt_add_dnat_target(b, r->dest_ip, r->dest_port);
- fwd_ipt_exec(b);
-
- b = fwd_ipt_init("nat");
- fwd_ipt_add_format(b, " -I zone_%s_forward 1", r->src->name);
- fwd_ipt_add_proto(b, r->proto);
- fwd_ipt_add_srcmac(b, r->src_mac);
- fwd_ipt_add_srcaddr(b, r->src_ip);
- fwd_ipt_add_srcport(b, r->src_port);
- fwd_ipt_add_destaddr(b, r->dest_ip);
- fwd_ipt_add_destport(b, r->dest_port);
- fwd_ipt_add_format(b, " -j ACCEPT");
- fwd_ipt_exec(b);
+ /* common drop rule */
+ if( (r = fwd_xt_init_rule(h)) != NULL )
+ {
+ /* -j DROP; -A handle_reject */
+ fwd_xt_get_target(r, "DROP");
+ fwd_xt_exec_rule(r, "handle_reject");
+ }
}
-static void fwd_ipt_rule_create(struct fwd_data *d)
+/* build accept target chain */
+static void fwd_r_handle_accept(struct iptc_handle *h)
{
- struct fwd_rule *r = &d->section.rule;
- struct fwd_ipt_rulebuf *b;
+ struct fwd_xt_rule *r;
- b = fwd_ipt_init("filter");
+ /* -N handle_accept */
+ fwd_r_new_chain(h, "handle_accept");
- if( r->dest )
- fwd_ipt_add_format(b, " -A zone_%s_forward", r->src->name);
- else
- fwd_ipt_add_format(b, " -A zone_%s", r->src->name);
-
- fwd_ipt_add_proto(b, r->proto);
- fwd_ipt_add_icmptype(b, r->icmp_type);
- fwd_ipt_add_srcmac(b, r->src_mac);
- fwd_ipt_add_srcaddr(b, r->src_ip);
- fwd_ipt_add_srcport(b, r->src_port);
- fwd_ipt_add_destaddr(b, r->dest_ip);
- fwd_ipt_add_destport(b, r->dest_port);
-
- if( r->dest )
- fwd_ipt_add_format(b, " -j zone_%s_%s",
- r->dest->name, fwd_str_target(r->target));
- else
- fwd_ipt_add_format(b, " -j %s", fwd_str_target(r->target));
-
- fwd_ipt_exec(b);
+ /* common accept rule */
+ if( (r = fwd_xt_init_rule(h)) != NULL )
+ {
+ /* -j ACCEPT; -A handle_accept */
+ fwd_xt_get_target(r, "ACCEPT");
+ fwd_xt_exec_rule(r, "handle_accept");
+ }
}
-static struct fwd_network_list *
-fwd_lookup_network(struct fwd_network_list *n, const char *net)
+static void fwd_ipt_defaults_create(struct fwd_data *d)
{
- struct fwd_network_list *e;
+ struct fwd_defaults *def = &d->section.defaults;
+ struct iptc_handle *h_filter, *h_nat;
- if( n != NULL )
- for( e = n; e; e = e->next )
- if( !strcmp(e->name, net) )
- return e;
+ if( !(h_filter = iptc_init("filter")) || !(h_nat = iptc_init("nat")) )
+ fwd_fatal("Unable to obtain libiptc handle");
- return NULL;
-}
+ /* policies */
+ fwd_r_set_policy(h_filter, "INPUT",
+ def->input == FWD_P_ACCEPT ? "ACCEPT" : "DROP");
+ fwd_r_set_policy(h_filter, "OUTPUT",
+ def->output == FWD_P_ACCEPT ? "ACCEPT" : "DROP");
+ fwd_r_set_policy(h_filter, "FORWARD",
+ def->forward == FWD_P_ACCEPT ? "ACCEPT" : "DROP");
-static struct fwd_addr_list *
-fwd_lookup_addr(struct fwd_addr_list *a, const char *ifname)
-{
- struct fwd_addr_list *e;
+ /* invalid state drop */
+ if( def->drop_invalid )
+ {
+ fwd_r_drop_invalid(h_filter, "INPUT");
+ fwd_r_drop_invalid(h_filter, "OUTPUT");
+ fwd_r_drop_invalid(h_filter, "FORWARD");
+ }
- if( a != NULL )
- for( e = a; e; e = e->next )
- if( !strcmp(e->ifname, ifname) )
- return e;
+ /* default accept related */
+ fwd_r_accept_related(h_filter, "INPUT");
+ fwd_r_accept_related(h_filter, "OUTPUT");
+ fwd_r_accept_related(h_filter, "FORWARD");
- return NULL;
+ /* default accept on lo */
+ fwd_r_accept_lo(h_filter);
+
+ /* syn flood protection */
+ if( def->syn_flood )
+ {
+ fwd_r_add_synflood(h_filter, def);
+ }
+
+ /* rule container chains */
+ fwd_r_new_chain(h_filter, "mssfix");
+ fwd_r_new_chain(h_filter, "zones");
+ fwd_r_new_chain(h_filter, "rules");
+ fwd_r_new_chain(h_filter, "redirects");
+ fwd_r_new_chain(h_filter, "forwardings");
+ fwd_r_jump_chain(h_filter, "INPUT", "rules");
+ fwd_r_jump_chain(h_filter, "FORWARD", "mssfix");
+ fwd_r_jump_chain(h_filter, "FORWARD", "zones");
+ fwd_r_jump_chain(h_filter, "FORWARD", "rules");
+ fwd_r_jump_chain(h_filter, "FORWARD", "redirects");
+ fwd_r_jump_chain(h_filter, "FORWARD", "forwardings");
+ fwd_r_new_chain(h_nat, "zonemasq");
+ fwd_r_new_chain(h_nat, "redirects");
+ fwd_r_jump_chain(h_nat, "POSTROUTING", "zonemasq");
+ fwd_r_jump_chain(h_nat, "PREROUTING", "redirects");
+ fwd_r_jump_chain(h_nat, "POSTROUTING", "redirects");
+
+ /* standard drop, accept, reject chain */
+ fwd_r_handle_drop(h_filter);
+ fwd_r_handle_accept(h_filter);
+ fwd_r_handle_reject(h_filter);
+
+
+ if( !iptc_commit(h_nat) )
+ fwd_fatal("Cannot commit nat table: %s", iptc_strerror(errno));
+
+ if( !iptc_commit(h_filter) )
+ fwd_fatal("Cannot commit filter table: %s", iptc_strerror(errno));
+
+ iptc_free(h_nat);
+ iptc_free(h_filter);
}
{
struct fwd_data *e;
+ fwd_xt_init();
+
for( e = h->conf; e; e = e->next )
{
switch(e->type)
fwd_ipt_defaults_create(e);
break;
- case FWD_S_ZONE:
- printf("\n## ZONE %s\n", e->section.zone.name);
- fwd_ipt_zone_create(e);
+ case FWD_S_INCLUDE:
+ printf("\n## INCLUDE %s\n", e->section.include.path);
break;
+ case FWD_S_ZONE:
case FWD_S_FORWARD:
- printf("\n## FORWARD %s -> %s\n",
- e->section.forwarding.src
- ? e->section.forwarding.src->name : "(all)",
- e->section.forwarding.dest
- ? e->section.forwarding.dest->name : "(all)");
- fwd_ipt_forwarding_create(e);
- break;
-
case FWD_S_REDIRECT:
- printf("\n## REDIRECT %s\n", e->section.forwarding.src->name);
- fwd_ipt_redirect_create(e);
- break;
-
case FWD_S_RULE:
- printf("\n## RULE %s\n", e->section.rule.src->name);
- fwd_ipt_rule_create(e);
- break;
-
- case FWD_S_INCLUDE:
- printf("\n## INCLUDE %s\n", e->section.include.path);
+ /* Make gcc happy */
break;
}
}
}
-void fwd_ipt_addif(struct fwd_handle *h, const char *net)
+
+static struct fwd_zone *
+fwd_lookup_zone(struct fwd_handle *h, const char *net)
{
struct fwd_data *e;
- struct fwd_zone *z;
- struct fwd_addr_list *a;
struct fwd_network_list *n;
for( e = h->conf; e; e = e->next )
- {
- if( (e->type != FWD_S_ZONE) ||
- !(n = fwd_lookup_network(e->section.zone.networks, net)) ||
- !(a = fwd_lookup_addr(h->addrs, n->ifname)) )
- continue;
+ if( e->type == FWD_S_ZONE )
+ for( n = e->section.zone.networks; n; n = n->next )
+ if( !strcmp(n->name, net) )
+ return &e->section.zone;
+
+ return NULL;
+}
+
+static struct fwd_network_list *
+fwd_lookup_network(struct fwd_zone *z, const char *net)
+{
+ struct fwd_network_list *n;
+
+ for( n = z->networks; n; n = n->next )
+ if( !strcmp(n->name, net) )
+ return n;
+
+ return NULL;
+}
- z = &e->section.zone;
+static struct fwd_addr_list *
+fwd_lookup_addr(struct fwd_handle *h, struct fwd_network_list *n)
+{
+ struct fwd_addr_list *a;
- printf("\n## NETWORK %s (%s - %s/%u)\n",
- n->name, n->ifname,
- inet_ntoa(a->ipaddr.v4), a->prefix
- );
+ if( n != NULL )
+ for( a = h->addrs; a; a = a->next )
+ if( !strcmp(a->ifname, n->ifname) )
+ return a;
- fwd_ipt_exec_format("filter", " -A input -i %s -j zone_%s",
- n->ifname, z->name);
+ return NULL;
+}
- fwd_ipt_exec_format("filter",
- " -I zone_%s_MSSFIX 1 -o %s -p tcp --tcp-flags SYN,RST SYN"
- " -j TCPMSS --clamp-mss-to-pmtu",
- z->name, n->ifname);
+void fwd_ipt_addif(struct fwd_handle *h, const char *net)
+{
+ struct fwd_data *e;
+ struct fwd_zone *z;
+ struct fwd_ipt_rulebuf *b;
+ struct fwd_rule *c;
+ struct fwd_redirect *r;
+ struct fwd_forwarding *f;
+ struct fwd_addr_list *a, *a2;
+ struct fwd_network_list *n, *n2;
+
+ if( !(z = fwd_lookup_zone(h, net)) )
+ return;
+
+ if( !(n = fwd_lookup_network(z, net)) )
+ return;
- fwd_ipt_exec_format("filter", " -I zone_%s_ACCEPT 1 -o %s -j ACCEPT",
- z->name, n->ifname);
+ if( !(a = fwd_lookup_addr(h, n)) )
+ return;
- fwd_ipt_exec_format("filter", " -I zone_%s_DROP 1 -o %s -j DROP",
- z->name, n->ifname);
+ printf("\n\n#\n# addif(%s)\n#\n", net);
- fwd_ipt_exec_format("filter", " -I zone_%s_REJECT 1 -o %s -j reject",
- z->name, n->ifname);
+ /* Build masquerading rule */
+ if( z->masq )
+ {
+ printf("\n# Net %s (%s) - masq\n", n->name, n->ifname);
- fwd_ipt_exec_format("filter", " -I zone_%s_ACCEPT 1 -i %s -j ACCEPT",
- z->name, n->ifname);
+ b = fwd_ipt_init("nat");
+ fwd_ipt_add_format(b, " -A zonemasq -o %s -j MASQUERADE", n->ifname);
+ fwd_ipt_add_comment(b, "masq", z, NULL, n);
+ fwd_ipt_exec(b);
+ }
- fwd_ipt_exec_format("filter", " -I zone_%s_DROP 1 -i %s -j DROP",
- z->name, n->ifname);
+ /* Build MSS fix rule */
+ if( z->mtu_fix )
+ {
+ printf("\n# Net %s (%s) - mtu_fix\n", n->name, n->ifname);
+
+ b = fwd_ipt_init("filter");
+ fwd_ipt_add_format(b,
+ " -A mssfix -o %s -p tcp --tcp-flags SYN,RST SYN"
+ " -j TCPMSS --clamp-mss-to-pmtu", n->ifname);
+ fwd_ipt_add_comment(b, "mssfix", z, NULL, n);
+ fwd_ipt_exec(b);
+ }
- fwd_ipt_exec_format("filter", " -I zone_%s_REJECT 1 -i %s -j reject",
- z->name, n->ifname);
+ /* Build intra-zone forwarding rules */
+ for( n2 = z->networks; n2; n2 = n2->next )
+ {
+ if( (a2 = fwd_lookup_addr(h, n2)) != NULL )
+ {
+ printf("\n# Net %s (%s) - intra-zone-forwarding"
+ " Z:%s N:%s I:%s -> Z:%s N:%s I:%s\n",
+ n->name, n->ifname, z->name, n->name, n->ifname,
+ z->name, n2->name, n2->ifname);
+
+ b = fwd_ipt_init("filter");
+ fwd_ipt_add_format(b, " -A zones -i %s -o %s",
+ n->ifname, n2->ifname);
+ fwd_ipt_add_policy_target(b, z->forward);
+ fwd_ipt_add_comment(b, "zone", z, n, n2);
+ fwd_ipt_exec(b);
+ }
+ }
- fwd_ipt_exec_format("filter",
- " -I zone_%s_nat 1 -t nat -o %s -j MASQUERADE",
- z->name, n->ifname);
+ /* Build inter-zone forwarding rules */
+ for( e = z->forwardings; e && (f = &e->section.forwarding); e = e->next )
+ {
+ for( n2 = f->dest->networks; n2; n2 = n2->next )
+ {
+ printf("\n# Net %s (%s) - inter-zone-forwarding"
+ " Z:%s N:%s I:%s -> Z:%s N:%s I:%s\n",
+ n->name, n->ifname, z->name, n->name, n->ifname,
+ f->dest->name, n2->name, n2->ifname);
+
+ /* Build forwarding rule */
+ b = fwd_ipt_init("filter");
+ fwd_ipt_add_format(b, " -A forwardings -i %s -o %s",
+ n->ifname, n2->ifname);
+ fwd_ipt_add_policy_target(b, FWD_P_ACCEPT);
+ fwd_ipt_add_comment(b, "forward", z, n, n2);
+ fwd_ipt_exec(b);
+ }
+ }
- fwd_ipt_exec_format("filter",
- " -I PREROUTING 1 -t nat -i %s -j zone_%s_prerouting",
- n->ifname, z->name);
+ /* Build DNAT rules */
+ for( e = z->redirects; e && (r = &e->section.redirect); e = e->next )
+ {
+ printf("\n# Net %s (%s) - redirect Z:%s N:%s I:%s\n",
+ n->name, n->ifname, z->name, n->name, n->ifname);
+
+ /* DNAT */
+ b = fwd_ipt_init("nat");
+ fwd_ipt_add_format(b, " -A redirects -i %s -d %s",
+ n->ifname, inet_ntoa(a->ipaddr.v4));
+ fwd_ipt_add_proto(b, r->proto);
+ fwd_ipt_add_srcaddr(b, r->src_ip);
+ fwd_ipt_add_srcport(b, r->src_port);
+ fwd_ipt_add_destport(b, r->src_dport);
+ fwd_ipt_add_srcmac(b, r->src_mac);
+ fwd_ipt_add_dnat_target(b, r->dest_ip, r->dest_port);
+ fwd_ipt_add_comment(b, "redir", z, n, NULL);
+ fwd_ipt_exec(b);
+
+ /* Forward */
+ b = fwd_ipt_init("filter");
+ fwd_ipt_add_format(b, " -A redirects -i %s", n->ifname);
+ fwd_ipt_add_proto(b, r->proto);
+ fwd_ipt_add_srcmac(b, r->src_mac);
+ fwd_ipt_add_srcaddr(b, r->src_ip);
+ fwd_ipt_add_srcport(b, r->src_port);
+ fwd_ipt_add_destaddr(b, r->dest_ip);
+ fwd_ipt_add_destport(b, r->dest_port);
+ fwd_ipt_add_policy_target(b, FWD_P_ACCEPT);
+ fwd_ipt_add_comment(b, "redir", z, n, NULL);
+ fwd_ipt_exec(b);
+
+ /* Add loopback rule if neither src_ip nor src_mac are defined */
+ if( !r->src_ip && !r->src_mac )
+ {
+ b = fwd_ipt_init("nat");
+ fwd_ipt_add_format(b, " -A redirects -i ! %s -d %s",
+ n->ifname, inet_ntoa(r->dest_ip->addr));
+ fwd_ipt_add_proto(b, r->proto);
+ fwd_ipt_add_srcport(b, r->src_port);
+ fwd_ipt_add_destport(b, r->src_dport);
+ fwd_ipt_add_format(b, " -j MASQUERADE");
+ fwd_ipt_add_comment(b, "redir", z, n, NULL);
+ fwd_ipt_exec(b);
+ }
+ }
- fwd_ipt_exec_format("filter", " -A forward -i %s -j zone_%s_forward",
- n->ifname, z->name);
+ /* Build rules */
+ for( e = z->rules; e && (c = &e->section.rule); e = e->next )
+ {
+ /* Has destination, add forward rule for each network in target zone */
+ if( c->dest )
+ {
+ for( n2 = c->dest->networks; n2; n2 = n2->next )
+ {
+ printf("\n# Net %s (%s) - rule+dest"
+ " Z:%s N:%s I:%s -> Z:%s N:%s I:%s\n",
+ n->name, n->ifname, z->name, n->name, n->ifname,
+ f->dest->name, n2->name, n2->ifname);
+
+ b = fwd_ipt_init("filter");
+ fwd_ipt_add_format(b, " -A rules -i %s -o %s",
+ n->ifname, n2->ifname);
+ fwd_ipt_add_proto(b, c->proto);
+ fwd_ipt_add_icmptype(b, c->icmp_type);
+ fwd_ipt_add_srcmac(b, c->src_mac);
+ fwd_ipt_add_srcaddr(b, c->src_ip);
+ fwd_ipt_add_srcport(b, c->src_port);
+ fwd_ipt_add_destaddr(b, c->dest_ip);
+ fwd_ipt_add_destport(b, c->dest_port);
+ fwd_ipt_add_policy_target(b, c->target);
+ fwd_ipt_add_comment(b, "rule", z, n, n2);
+ fwd_ipt_exec(b);
+ }
+ }
- fwd_ipt_exec_format("raw", " -I PREROUTING 1 -i %s -j zone_%s_notrack",
- n->ifname, z->name);
+ /* No destination specified, treat it as input rule */
+ else
+ {
+ printf("\n# Net %s (%s) - rule Z:%s N:%s I:%s\n",
+ n->name, n->ifname, z->name, n->name, n->ifname);
+
+ b = fwd_ipt_init("filter");
+ fwd_ipt_add_format(b, " -A rules -i %s", n->ifname);
+ fwd_ipt_add_proto(b, c->proto);
+ fwd_ipt_add_icmptype(b, c->icmp_type);
+ fwd_ipt_add_srcmac(b, c->src_mac);
+ fwd_ipt_add_srcaddr(b, c->src_ip);
+ fwd_ipt_add_srcport(b, c->src_port);
+ fwd_ipt_add_destaddr(b, c->dest_ip);
+ fwd_ipt_add_destport(b, c->dest_port);
+ fwd_ipt_add_policy_target(b, c->target);
+ fwd_ipt_add_comment(b, "rule", z, n, n2);
+ fwd_ipt_exec(b);
+ }
}
}
projects / project / luci.git / blobdiff