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/*
* BIRD -- Firewall Protocol Configuration
*
* (c) 2011 Alexander V. Chernikov <<A HREF="http://trubka.network.cz/mailman/listinfo/bird-users">melifaro at FreeBSD.org</A>>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
/**
* DOC: Firewall
*
* Firewall protocol is very simple. It adds or removes exported routes to given firewall
* table with zero (or filter-specified) value. Table can be flushed on startup to
* avoid error messages on bird restart.
*/
#undef LOCAL_DEBUG
#include "nest/bird.h"
#include "nest/iface.h"
#include "nest/protocol.h"
#include "nest/route.h"
#include "conf/conf.h"
#include "filter/filter.h"
#include "lib/string.h"
#include "firewall.h"
static int init_done = 0;
static void
firewall_collect(void)
{
memset(&firewalls, 0, sizeof(firewalls));
log(L_DEBUG "Initializing firewalls..");
#ifdef CONFIG_FIREWALL_IPFW
firewalls[FWTYPE_IPFW] = &fw_ipfw;
log(L_DEBUG "IPFW..");
#endif
#ifdef CONFIG_FIREWALL_PF
firewalls[FWTYPE_PF] = &fw_pf;
log(L_DEBUG "PF..");
#endif
#ifdef CONFIG_FIREWALL_IPSET
firewalls[FWTYPE_IPSET] = &fw_ipset;
log(L_DEBUG "IPSET..");
#endif
}
static void
firewall_rt_notify(struct proto *P, rtable *src_table, net *n, rte *new, rte *old, ea_list *attrs)
{
struct firewall_proto *p = (struct firewall_proto *) P;
u32 prefix_val;
char prefix_data[10];
if (!new && !old)
return;
prefix_val = ea_get_int(attrs, EA_FIREWALL_VALUE, 0);
if (prefix_val)
bsnprintf(prefix_data, sizeof(prefix_data), "%u", prefix_val);
else
prefix_data[0] = '\0';
DBG("Got prefix %I/%d with data '%s'\n", n->n.prefix, n->n.pxlen, prefix_data);
if (old && new && p->fw->fw_replace)
{
if (!p->fw->fw_replace(p->fwdata, n, prefix_data))
log(L_ERR "Replacing prefix %I/%d with data '%S' failed", n->n.prefix, n->n.pxlen, prefix_data);
return;
}
if (old)
if (!p->fw->fw_del(p->fwdata, n))
log(L_ERR "Removing prefix %I/%d failed", n->n.prefix, n->n.pxlen);
if (new)
if (!p->fw->fw_add(p->fwdata, n, prefix_data))
log(L_ERR "Adding prefix %I/%d with data '%s' failed", n->n.prefix, n->n.pxlen, prefix_data);
}
static int
firewall_start(struct proto *P)
{
struct firewall_proto *p = (struct firewall_proto *) P;
struct firewall_config *c = (struct firewall_config *)P->cf;
void *fwdata;
if ((fwdata = p->fw->fw_init(P, c->fwtable)) == NULL)
return PS_DOWN;
p->fwdata = fwdata;
/* Flush table if needed */
if ((c->flush_start) && (p->fw->fw_flush))
if (!p->fw->fw_flush(fwdata))
{
log(L_ERR "flush failed for table %s", c->fwtable);
return PS_DOWN;
}
return PS_UP;
}
static int
firewall_shutdown(struct proto *P)
{
struct firewall_proto *p = (struct firewall_proto *) P;
struct firewall_config *c = (struct firewall_config *)P->cf;
log(L_DEBUG, "Shutdown requested");
/* Flush table if needed */
if ((c->flush_shutdown) && (p->fw->fw_flush))
if (!p->fw->fw_flush(p->fwdata))
log(L_ERR "flush failed for table %s", c->fwtable);
p->fw->fw_shutdown(p->fwdata);
return PS_DOWN;
}
static struct proto *
firewall_init(struct proto_config *C)
{
struct firewall_config *c = (struct firewall_config *) C;
struct proto *P = proto_new(C, sizeof(struct firewall_proto));
struct firewall_proto *p = (struct firewall_proto *) P;
/* Configure firewalls */
if (!init_done)
{
init_done = 1;
firewall_collect();
}
p->fwtype = c->fwtype;
p->fw = firewalls[p->fwtype];
P->accept_ra_types = RA_OPTIMAL;
P->rt_notify = firewall_rt_notify;
return P;
}
static int
firewall_reconfigure(struct proto *P, struct proto_config *new)
{
struct firewall_config *o = (struct firewall_config *) P->cf;
struct firewall_config *n = (struct firewall_config *) new;
if ((o->fwtype != n->fwtype) || (strcmp(o->fwtable, n->fwtable)))
return 0;
return 1;
}
static void
firewall_copy_config(struct proto_config *dest, struct proto_config *src)
{
/* Just a shallow copy, not many items here */
proto_copy_rest(dest, src, sizeof(struct firewall_config));
}
static void
firewall_get_status(struct proto *P, byte *buf)
{
struct firewall_config *c = (struct firewall_config *) P->cf;
bsprintf(buf, "Table [%s]", c ? c->fwtable : "none");
}
static int
firewall_get_attr(eattr * a, byte * buf, int buflen UNUSED)
{
switch (a->id)
{
case EA_FIREWALL_VALUE:
bsprintf(buf, "fw_value");
return GA_NAME;
default:
return GA_UNKNOWN;
}
}
struct protocol proto_firewall = {
name: "Firewall",
template: "fw%d",
class: PROTOCOL_FIREWALL,
init: firewall_init,
start: firewall_start,
shutdown: firewall_shutdown,
reconfigure: firewall_reconfigure,
copy_config: firewall_copy_config,
get_status: firewall_get_status,
get_attr: firewall_get_attr,
};
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