[PATCH 1/1] * Add draft support for firewall protocol
Alexander V. Chernikov
melifaro at ipfw.ru
Tue Dec 6 13:11:22 CET 2011
---
configure.in | 3 +-
nest/proto.c | 3 +
nest/protocol.h | 2 +-
proto/firewall/Doc | 1 +
proto/firewall/Makefile | 6 ++
proto/firewall/config.Y | 71 +++++++++++++++++
proto/firewall/firewall.c | 152 +++++++++++++++++++++++++++++++++++++
proto/firewall/firewall.h | 48 ++++++++++++
sysdep/autoconf.h.in | 5 +
sysdep/bsd/Modules | 1 +
sysdep/bsd/fw.c | 185 +++++++++++++++++++++++++++++++++++++++++++++
11 files changed, 475 insertions(+), 2 deletions(-)
create mode 100644 proto/firewall/Doc
create mode 100644 proto/firewall/Makefile
create mode 100644 proto/firewall/config.Y
create mode 100644 proto/firewall/firewall.c
create mode 100644 proto/firewall/firewall.h
create mode 100644 sysdep/bsd/fw.c
diff --git a/configure.in b/configure.in
index 46a6ecd..48d8968 100644
--- a/configure.in
+++ b/configure.in
@@ -47,7 +47,7 @@ if test "$enable_ipv6" = yes ; then
else
ip=ipv4
SUFFIX6=""
- all_protocols=bgp,ospf,pipe,rip,static
+ all_protocols=bgp,ospf,pipe,rip,static,firewall
fi
if test "$with_protocols" = all ; then
@@ -130,6 +130,7 @@ else
ipv6:freebsd*) sysdesc=bsd-v6
;;
ipv4:freebsd*) sysdesc=bsd
+ AC_DEFINE(CONFIG_FIREWALL_IPFW, 1)
;;
ipv6:kfreebsd*) sysdesc=bsd-v6
;;
diff --git a/nest/proto.c b/nest/proto.c
index d55c348..85bdb19 100644
--- a/nest/proto.c
+++ b/nest/proto.c
@@ -632,6 +632,9 @@ protos_build(void)
#ifdef CONFIG_BGP
proto_build(&proto_bgp);
#endif
+#ifdef CONFIG_FIREWALL
+ proto_build(&proto_firewall);
+#endif
proto_pool = rp_new(&root_pool, "Protocols");
proto_flush_event = ev_new(proto_pool);
proto_flush_event->hook = proto_flush_all;
diff --git a/nest/protocol.h b/nest/protocol.h
index a7518c2..d09a556 100644
--- a/nest/protocol.h
+++ b/nest/protocol.h
@@ -73,7 +73,7 @@ void protos_dump_all(void);
extern struct protocol
proto_device, proto_radv, proto_rip, proto_static,
- proto_ospf, proto_pipe, proto_bgp;
+ proto_ospf, proto_pipe, proto_bgp, proto_firewall;
/*
* Routing Protocol Instance
diff --git a/proto/firewall/Doc b/proto/firewall/Doc
new file mode 100644
index 0000000..5779342
--- /dev/null
+++ b/proto/firewall/Doc
@@ -0,0 +1 @@
+S firewall.c
diff --git a/proto/firewall/Makefile b/proto/firewall/Makefile
new file mode 100644
index 0000000..a322ab6
--- /dev/null
+++ b/proto/firewall/Makefile
@@ -0,0 +1,6 @@
+source=firewall.c
+root-rel=../../
+dir-name=proto/firewall
+
+include ../../Rules
+
diff --git a/proto/firewall/config.Y b/proto/firewall/config.Y
new file mode 100644
index 0000000..bbe314a
--- /dev/null
+++ b/proto/firewall/config.Y
@@ -0,0 +1,71 @@
+/*
+ * BIRD -- Firewall Protocol Configuration
+ *
+ * (c) 2011 Alexander V. Chernikov <melifaro at FreeBSD.org>
+ *
+ * Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+CF_HDR
+
+#include "proto/firewall/firewall.h"
+
+CF_DEFINES
+
+#define FIREWALL_CFG ((struct firewall_config *) this_proto)
+
+CF_DECLS
+
+CF_KEYWORDS(FIREWALL, FWTABLE, FWTYPE, IPFW, PF, IPTABLES, FLUSH)
+
+%type <i> firewall_type
+CF_GRAMMAR
+
+CF_ADDTO(proto, firewall_proto '}')
+
+firewall_proto_start: proto_start FIREWALL {
+ this_proto = proto_config_new(&proto_firewall, sizeof(struct firewall_config), $1);
+ this_proto->preference = 0;
+ }
+ ;
+
+firewall_proto:
+ firewall_proto_start proto_name '{'
+ | firewall_proto proto_item ';'
+ | firewall_proto firewall_proto_item ';'
+ ;
+
+firewall_proto_item:
+ FWTYPE firewall_type {
+ switch ($2)
+ {
+#ifdef CONFIG_FIREWALL_IPFW
+ case FWTYPE_IPFW:
+ break;
+#endif
+#ifdef CONFIG_FIREWALL_PF
+ case FWTYPE_PF:
+ break;
+#endif
+#ifdef CONFIG_FIREWALL_IPTABLES
+ case FWTYPE_IPTABLES:
+ break;
+#endif
+ default:
+ cf_error("firewall type is not supported by your OS");
+ }
+ FIREWALL_CFG->fwtype = $2;
+ };
+ | FWTABLE TEXT { FIREWALL_CFG->fwtable = $2; }
+ | FLUSH { FIREWALL_CFG->flush = 1; }
+ ;
+
+firewall_type:
+ IPFW { $$ = FWTYPE_IPFW; }
+ | PF { $$ = FWTYPE_PF; }
+ | IPTABLES { $$ = FWTYPE_IPTABLES; }
+ ;
+
+CF_CODE
+
+CF_END
diff --git a/proto/firewall/firewall.c b/proto/firewall/firewall.c
new file mode 100644
index 0000000..070b608
--- /dev/null
+++ b/proto/firewall/firewall.c
@@ -0,0 +1,152 @@
+/*
+ * BIRD -- Firewall Protocol Configuration
+ *
+ * (c) 2011 Alexander V. Chernikov <melifaro at FreeBSD.org>
+ *
+ * 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_IPTABLES
+ firewalls[FWTYPE_IPTABLES] = &fw_iptables;
+ log(L_DEBUG "IPTABLES..");
+#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;
+
+ if (!new && !old)
+ return;
+
+ char *prefix_data = "";
+
+ DBG("Got prefix %I/%d with data '%s'\n", n->n.prefix, n->n.pxlen, prefix_data);
+
+ 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;
+
+ if ((c->flush) && (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 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");
+}
+
+
+struct protocol proto_firewall = {
+ name: "Firewall",
+ template: "fw%d",
+ init: firewall_init,
+ start: firewall_start,
+ reconfigure: firewall_reconfigure,
+ copy_config: firewall_copy_config,
+ get_status: firewall_get_status,
+};
diff --git a/proto/firewall/firewall.h b/proto/firewall/firewall.h
new file mode 100644
index 0000000..c08cb73
--- /dev/null
+++ b/proto/firewall/firewall.h
@@ -0,0 +1,48 @@
+/*
+ * BIRD -- Table-to-Table Routing Protocol a.k.a Pipe
+ *
+ * (c) 1999 Martin Mares <mj at ucw.cz>
+ *
+ * Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+#ifndef _BIRD_FIREWALL_H_
+#define _BIRD_FIREWALL_H_
+
+#define FWTYPE_IPFW 0
+#define FWTYPE_PF 1
+#define FWTYPE_IPTABLES 2
+
+#define FWTYPE_MAX 3
+
+struct firewall_config {
+ struct proto_config c;
+ int fwtype; /* Firewall type */
+ char *fwtable; /* Firewall table to write to */
+ int flush; /* Do table flush on startup? */
+};
+
+struct firewall_control {
+ int fwtype; /* Firewall type */
+ char *description; /* Firewall description */
+ void *(*fw_init)(struct proto *, char *); /* Init firewall instance */
+ void (*fw_shutdown)(void *); /* Shutdown firewall instance */
+ int (*fw_flush)(void *); /* Flush firewall table */
+ int (*fw_add)(void *, net *, char *); /* Add record to table */
+ int (*fw_del)(void *, net *); /* Remove record from table */
+};
+
+struct firewall_control * firewalls[FWTYPE_MAX];
+
+struct firewall_proto {
+ struct proto p;
+ int fwtype; /* Firewall type */
+ struct firewall_control *fw; /* Pointer to configured protocol type */
+ void *fwdata; /* Firewall instance private data */
+};
+
+extern struct protocol proto_firewall;
+
+extern struct firewall_control fw_ipfw, fw_pf, fw_iptables;
+
+#endif
diff --git a/sysdep/autoconf.h.in b/sysdep/autoconf.h.in
index d029e2a..1980d20 100644
--- a/sysdep/autoconf.h.in
+++ b/sysdep/autoconf.h.in
@@ -42,6 +42,11 @@
#undef CONFIG_BGP
#undef CONFIG_OSPF
#undef CONFIG_PIPE
+#undef CONFIG_FIREWALL
+
+#undef CONFIG_FIREWALL_IPFW
+#undef CONFIG_FIREWALL_PF
+#undef CONFIG_FIREWALL_IPTABLES
/* We have <syslog.h> and syslog() */
#undef HAVE_SYSLOG
diff --git a/sysdep/bsd/Modules b/sysdep/bsd/Modules
index 84abffd..77f26e3 100644
--- a/sysdep/bsd/Modules
+++ b/sysdep/bsd/Modules
@@ -4,3 +4,4 @@ sysio.h
krt-set.h
krt-sock.c
krt-sock.h
+fw.c
diff --git a/sysdep/bsd/fw.c b/sysdep/bsd/fw.c
new file mode 100644
index 0000000..b626e65
--- /dev/null
+++ b/sysdep/bsd/fw.c
@@ -0,0 +1,185 @@
+/*
+ * BIRD -- IPFW/PF manipulations
+ *
+ * (c) 2011 Alexander V. Chernikov <melifaro at FreeBSD.org>
+ *
+ * Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <ctype.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/sysctl.h>
+#include <sys/ioctl.h>
+#include <netinet/in.h>
+#include <errno.h>
+#include <err.h>
+#include <net/route.h>
+#include <net/if.h>
+#include <net/if_dl.h>
+
+#define LOCAL_DEBUG
+
+#include "nest/bird.h"
+#include "nest/iface.h"
+#include "nest/route.h"
+#include "nest/protocol.h"
+#include "nest/iface.h"
+#include "lib/timer.h"
+#include "lib/unix.h"
+#include "lib/krt.h"
+#include "lib/string.h"
+#include "lib/socket.h"
+#ifdef CONFIG_FIREWALL
+#include "proto/firewall/firewall.h"
+#ifdef CONFIG_FIREWALL_IPFW
+#include "netinet/ip_fw.h"
+#endif
+
+#ifdef CONFIG_FIREWALL_IPFW
+
+struct ipfw_priv {
+ int fd; /* file descriptor */
+ int table; /* Table number */
+ pool *pool; /* Protocol pool */
+};
+
+int
+ipfw_do_cmd(struct ipfw_priv *priv, int optname, void *optval, uintptr_t optlen)
+{
+ return setsockopt(priv->fd, IPPROTO_IP, optname, optval, optlen);
+}
+
+void *
+ipfw_fw_init(struct proto *p, char *table)
+{
+ pool *fwpool = p->pool;
+ int table_num = strtol(table, NULL, 10);
+ int fd;
+
+ if ((table_num < 0) || (table_num > 127))
+ {
+ log(L_ERR "ipfw table %d is not within possible range");
+ return NULL;
+ }
+
+ if ((fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) == -1)
+ {
+ log(L_ERR "ipfw: error opering raw socket: %m");
+ return NULL;
+ }
+
+ struct ipfw_priv *priv = mb_alloc(fwpool, sizeof(struct ipfw_priv));
+
+ priv->table = table_num;
+ priv->pool = fwpool;
+ priv->fd = fd;
+
+ DBG("Opened IPFW socked %d\n", priv->fd);
+
+ return priv;
+}
+
+void
+ipfw_fw_shutdown(void *_priv)
+{
+ struct ipfw_priv *priv = _priv;
+
+ if (priv->fd != -1)
+ close(priv->fd);
+
+ mb_free(priv);
+}
+
+int
+ipfw_fw_flush(void *_priv)
+{
+ struct ipfw_priv *priv = _priv;
+ ipfw_table_entry ent;
+
+ memset(&ent, 0, sizeof(ent));
+ ent.tbl = priv->table;
+
+ log(L_ERR "Flushing ipfw table %d", priv->table);
+
+ if (ipfw_do_cmd(priv, IP_FW_TABLE_FLUSH, &ent.tbl, sizeof(ent.tbl)) == -1)
+ {
+ log(L_ERR "Error flushing ipfw table %d: %m", priv->table);
+ return 0;
+ }
+
+ return 1;
+}
+
+int
+ipfw_fw_add(void *_priv, net *n, char *prefixdata)
+{
+ struct ipfw_priv *priv = _priv;
+ ip_addr addr;
+ ipfw_table_entry ent;
+
+ addr = n->n.prefix;
+ ipa_hton(addr);
+
+ ent.masklen = n->n.pxlen;
+ memcpy(&ent.addr, &addr, sizeof(ip_addr));
+ ent.value = strtol(prefixdata, NULL, 0);
+ ent.tbl = priv->table;
+
+
+ log(L_ERR "Adding %I/%d to ipfw table %d with value %s", n->n.prefix, n->n.pxlen, priv->table, prefixdata);
+
+ if (ipfw_do_cmd(priv, IP_FW_TABLE_ADD, &ent, sizeof(ent)) == -1)
+ {
+ log(L_ERR "Error adding %I/%d to ipfw table %d: %m", n->n.prefix, n->n.pxlen, priv->table);
+ return 0;
+ }
+
+ return 1;
+}
+
+int
+ipfw_fw_del(void *_priv, net *n)
+{
+ struct ipfw_priv *priv = _priv;
+ ip_addr addr;
+ ipfw_table_entry ent;
+
+ addr = n->n.prefix;
+ ipa_hton(addr);
+
+ ent.masklen = n->n.pxlen;
+ memcpy(&ent.addr, &addr, sizeof(ip_addr));
+ ent.value = 0;
+ ent.tbl = priv->table;
+
+ log(L_ERR "Removing %I/%d from ipfw table %d", n->n.prefix, n->n.pxlen, priv->table);
+
+ if (ipfw_do_cmd(priv, IP_FW_TABLE_DEL, &ent, sizeof(ent)) == -1)
+ {
+ log(L_ERR "Error removing %I/%d from ipfw table %d: %m", n->n.prefix, n->n.pxlen, priv->table);
+ return 0;
+ }
+
+ return 1;
+}
+
+struct firewall_control fw_ipfw = {
+ fwtype: FWTYPE_IPFW,
+ description: "IPFW",
+ fw_init: ipfw_fw_init,
+ fw_shutdown: ipfw_fw_shutdown,
+ fw_flush: ipfw_fw_flush,
+ fw_add: ipfw_fw_add,
+ fw_del: ipfw_fw_del,
+};
+#endif
+
+#endif
+
--
1.7.3.2
--------------060202010104050107080409--
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