2 * Copyright (C) 2009 Luigi Rizzo, Marta Carbone, Universita` di Pisa
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * $Id: ipfw2_mod.c 4671 2010-01-04 17:50:51Z luigi $
29 * The main interface to build ipfw+dummynet as a linux module.
30 * (and possibly as a windows module as well, though that part
31 * is not complete yet).
33 * The control interface uses the sockopt mechanism
34 * on a socket(AF_INET, SOCK_RAW, IPPROTO_RAW).
36 * The data interface uses the netfilter interface, at the moment
37 * hooked to the PRE_ROUTING and POST_ROUTING hooks.
38 * Unfortunately the netfilter interface is a moving target,
39 * so we need a set of macros to adapt to the various cases.
41 * In the netfilter hook we just mark packet as 'QUEUE' and then
42 * let the queue handler to do the whole work (filtering and
43 * possibly emulation).
44 * As we receive packets, we wrap them with an mbuf descriptor
45 * so the existing ipfw+dummynet code runs unmodified.
48 #include <sys/cdefs.h>
49 #include <sys/mbuf.h> /* sizeof struct mbuf */
50 #include <sys/param.h> /* NGROUPS */
53 #include <linux/module.h>
54 #include <linux/kernel.h>
55 #include <linux/netfilter.h>
56 #include <linux/netfilter_ipv4.h> /* NF_IP_PRI_FILTER */
58 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,25)
59 #include <net/netfilter/nf_queue.h> /* nf_queue */
62 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,17)
66 #endif /* !__linux__ */
68 #include <netinet/in.h> /* in_addr */
69 #include <netinet/ip_fw.h> /* ip_fw_ctl_t, ip_fw_chk_t */
70 #include <netinet/ipfw/ip_fw_private.h> /* ip_fw_ctl_t, ip_fw_chk_t */
71 #include <netinet/ip_dummynet.h> /* ip_dn_ctl_t, ip_dn_io_t */
72 #include <net/pfil.h> /* PFIL_IN, PFIL_OUT */
73 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
74 #warning --- inet_hashtables not present on 2.4
75 #include <linux/tcp.h>
76 #include <net/route.h>
78 static inline int inet_iif(const struct sk_buff *skb)
80 return ((struct rtable *)skb->dst)->rt_iif;
84 #include <net/inet_hashtables.h> /* inet_lookup */
86 #include <net/route.h> /* inet_iif */
89 * Here we allocate some global variables used in the firewall.
91 //ip_dn_ctl_t *ip_dn_ctl_ptr;
92 int (*ip_dn_ctl_ptr)(struct sockopt *);
94 ip_fw_ctl_t *ip_fw_ctl_ptr;
96 int (*ip_dn_io_ptr)(struct mbuf **m, int dir, struct ip_fw_args *fwa);
97 ip_fw_chk_t *ip_fw_chk_ptr;
99 void (*bridge_dn_p)(struct mbuf *, struct ifnet *);
102 * Glue code to implement the registration of children with the parent.
103 * Each child should call my_mod_register() when linking, so that
104 * module_init() and module_exit() can call init_children() and
105 * fini_children() to provide the necessary initialization.
106 * We use the same mechanism for MODULE_ and SYSINIT_.
107 * The former only get a pointer to the moduledata,
108 * the latter have two function pointers (init/uninit)
110 #include <sys/module.h>
114 struct moduledata *mod;
115 void (*init)(void), (*uninit)(void);
118 static unsigned int mod_idx;
119 static struct mod_args mods[10]; /* hard limit to 10 modules */
122 my_mod_register(const char *name, int order,
123 struct moduledata *mod, void *init, void *uninit);
125 * my_mod_register should be called automatically as the init
126 * functions in the submodules. Unfortunately this compiler/linker
127 * trick is not supported yet so we call it manually.
130 my_mod_register(const char *name, int order,
131 struct moduledata *mod, void *init, void *uninit)
133 struct mod_args m = { .name = name, .order = order,
134 .mod = mod, .init = init, .uninit = uninit };
136 printf("%s %s called\n", __FUNCTION__, name);
137 if (mod_idx < sizeof(mods) / sizeof(mods[0]))
147 /* Call the functions registered at init time. */
148 printf("%s mod_idx value %d\n", __FUNCTION__, mod_idx);
149 for (i = 0; i < mod_idx; i++) {
150 struct mod_args *m = &mods[i];
151 printf("+++ start module %d %s %s at %p order 0x%x\n",
152 i, m->name, m->mod ? m->mod->name : "SYSINIT",
154 if (m->mod && m->mod->evhand)
155 m->mod->evhand(NULL, MOD_LOAD, m->mod->priv);
166 /* Call the functions registered at init time. */
167 for (i = mod_idx - 1; i >= 0; i--) {
168 struct mod_args *m = &mods[i];
169 printf("+++ end module %d %s %s at %p order 0x%x\n",
170 i, m->name, m->mod ? m->mod->name : "SYSINIT",
172 if (m->mod && m->mod->evhand)
173 m->mod->evhand(NULL, MOD_UNLOAD, m->mod->priv);
178 /*--- end of module binding helper functions ---*/
182 * ipfw_ctl_h() is a wrapper for linux to FreeBSD sockopt call convention.
183 * then call the ipfw handler in order to manage requests.
184 * In turn this is called by the linux set/get handlers.
187 ipfw_ctl_h(struct sockopt *s, int cmd, int dir, int len, void __user *user)
192 memset(s, 0, sizeof(s));
195 s->sopt_valsize = len;
198 /* sopt_td is not used but it is referenced */
199 memset(&t, 0, sizeof(t));
202 // printf("%s called with cmd %d len %d\n", __FUNCTION__, cmd, len);
204 if (cmd < IP_DUMMYNET_CONFIGURE && ip_fw_ctl_ptr)
205 ret = ip_fw_ctl_ptr(s);
206 else if (cmd >= IP_DUMMYNET_CONFIGURE && ip_dn_ctl_ptr)
207 ret = ip_dn_ctl_ptr(s);
209 return -ret; /* errors are < 0 on linux */
215 netisr_dispatch(int __unused num, struct mbuf *m)
220 ip_output(struct mbuf *m, struct mbuf __unused *opt,
221 struct route __unused *ro, int __unused flags,
222 struct ip_moptions __unused *imo, struct inpcb __unused *inp)
224 netisr_dispatch(0, m);
228 #else /* this is the linux glue */
230 * setsockopt hook has no return value other than the error code.
233 do_ipfw_set_ctl(struct sock __unused *sk, int cmd,
234 void __user *user, unsigned int len)
236 struct sockopt s; /* pass arguments */
238 return ipfw_ctl_h(&s, cmd, SOPT_SET, len, user);
242 * getsockopt can can return a block of data in response.
245 do_ipfw_get_ctl(struct sock __unused *sk,
246 int cmd, void __user *user, int *len)
248 struct sockopt s; /* pass arguments */
249 int ret = ipfw_ctl_h(&s, cmd, SOPT_GET, *len, user);
251 *len = s.sopt_valsize; /* return lenght back to the caller */
256 * declare our [get|set]sockopt hooks
258 static struct nf_sockopt_ops ipfw_sockopts = {
260 .set_optmin = _IPFW_SOCKOPT_BASE,
261 .set_optmax = _IPFW_SOCKOPT_END,
262 .set = do_ipfw_set_ctl,
263 .get_optmin = _IPFW_SOCKOPT_BASE,
264 .get_optmax = _IPFW_SOCKOPT_END,
265 .get = do_ipfw_get_ctl,
266 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
267 .owner = THIS_MODULE,
272 * We need a number of macros to adapt to the various APIs in
273 * different linux versions. Among them:
275 * - the hook names change between macros (NF_IP*) and enum NF_INET_*
277 * - the second argument to the netfilter hook is
278 * struct sk_buff ** in kernels <= 2.6.22
279 * struct sk_buff * in kernels > 2.6.22
281 * - NF_STOP is not defined before 2.6 so we remap it to NF_ACCEPT
283 * - the packet descriptor passed to the queue handler is
284 * struct nf_info in kernels <= 2.6.24
285 * struct nf_queue_entry in kernels <= 2.6.24
287 * - the arguments to the queue handler also change;
291 * declare hook to grab packets from the netfilter interface.
292 * The NF_* names change in different versions of linux, in some
293 * cases they are #defines, in others they are enum, so we
296 #ifndef NF_IP_PRE_ROUTING
297 #define NF_IP_PRE_ROUTING NF_INET_PRE_ROUTING
299 #ifndef NF_IP_POST_ROUTING
300 #define NF_IP_POST_ROUTING NF_INET_POST_ROUTING
304 * ipfw hooks into the POST_ROUTING and the PRE_ROUTING chains.
305 * PlanetLab sets skb_tag to the slice id in the LOCAL_INPUT and
306 * POST_ROUTING chains, so if we want to use that information we
307 * need to hook the LOCAL_INPUT chain instead of the PRE_ROUTING.
308 * However at the moment the skb_tag info is not reliable so
309 * we stay with the standard hooks.
311 #if 0 // defined(IPFW_PLANETLAB)
312 #define IPFW_HOOK_IN NF_IP_LOCAL_IN
314 #define IPFW_HOOK_IN NF_IP_PRE_ROUTING
318 * The main netfilter hook.
319 * To make life simple, we queue everything and then do all the
320 * decision in the queue handler.
322 * XXX note that in 2.4 and up to 2.6.22 the skbuf is passed as sk_buff**
323 * so we have an #ifdef to set the proper argument type.
326 call_ipfw(unsigned int __unused hooknum,
327 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) // in 2.6.22 we have **
328 struct sk_buff __unused **skb,
330 struct sk_buff __unused *skb,
332 const struct net_device __unused *in,
333 const struct net_device __unused *out,
334 int __unused (*okfn)(struct sk_buff *))
339 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
340 #define NF_STOP NF_ACCEPT
343 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25)
346 * nf_queue_entry is a recent addition, in previous versions
347 * of the code the struct is called nf_info.
349 #define nf_queue_entry nf_info /* for simplicity */
351 /* also, 2.4 and perhaps something else have different arguments */
352 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) /* unsure on the exact boundary */
353 /* on 2.4 we use nf_info */
354 #define QH_ARGS struct sk_buff *skb, struct nf_info *info, void *data
355 #else /* 2.6.1.. 2.6.24 */
356 #define QH_ARGS struct sk_buff *skb, struct nf_info *info, unsigned int qnum, void *data
359 #define DEFINE_SKB /* nothing, already an argument */
360 #define REINJECT(_inf, _verd) nf_reinject(skb, _inf, _verd)
362 #else /* 2.6.25 and above */
364 #define QH_ARGS struct nf_queue_entry *info, unsigned int queuenum
365 #define DEFINE_SKB struct sk_buff *skb = info->skb;
366 #define REINJECT(_inf, _verd) nf_reinject(_inf, _verd)
370 * used by dummynet when dropping packets
371 * XXX use dummynet_send()
374 reinject_drop(struct mbuf* m)
376 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25) /* unsure on the exact boundary */
377 struct sk_buff *skb = (struct sk_buff *)m;
379 REINJECT(m->queue_entry, NF_DROP);
383 * The real call to the firewall. nf_queue_entry points to the skbuf,
384 * and eventually we need to return both through nf_reinject().
387 ipfw2_queue_handler(QH_ARGS)
389 DEFINE_SKB /* no semicolon here, goes in the macro */
390 int ret = 0; /* return value */
393 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
394 if (skb->nh.iph == NULL) {
395 printf("null dp, len %d reinject now\n", skb->len);
396 REINJECT(info, NF_ACCEPT);
400 m = malloc(sizeof(*m), 0, 0);
402 printf("malloc fail, len %d reinject now\n", skb->len);
403 REINJECT(info, NF_ACCEPT);
408 m->m_len = skb->len; /* len in this skbuf */
409 m->m_pkthdr.len = skb->len; /* total packet len */
410 m->m_pkthdr.rcvif = info->indev;
411 m->queue_entry = info;
412 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
413 m->m_data = skb->nh.iph;
415 m->m_data = skb_network_header(skb);
418 /* XXX add the interface */
419 if (info->hook == IPFW_HOOK_IN) {
420 ret = ipfw_check_hook(NULL, &m, info->indev, PFIL_IN, NULL);
422 ret = ipfw_check_hook(NULL, &m, info->outdev, PFIL_OUT, NULL);
425 if (m != NULL) { /* Accept. reinject and free the mbuf */
426 REINJECT(info, NF_ACCEPT);
428 } else if (ret == 0) {
429 /* dummynet has kept the packet, will reinject later. */
432 * Packet dropped by ipfw or dummynet. Nothing to do as
433 * FREE_PKT already did a reinject as NF_DROP
444 /* XXX should include prototypes for netisr_dispatch and ip_output */
446 * The reinjection routine after a packet comes out from dummynet.
447 * We must update the skb timestamp so ping reports the right time.
450 netisr_dispatch(int num, struct mbuf *m)
452 struct nf_queue_entry *info = m->queue_entry;
453 struct sk_buff *skb = m->m_skb; /* always used */
457 KASSERT((info != NULL), ("%s info null!\n", __FUNCTION__));
458 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22) // XXX above 2.6.x ?
459 __net_timestamp(skb); /* update timestamp */
462 /* XXX to obey one-pass, possibly call the queue handler here */
463 REINJECT(info, ((num == -1)?NF_DROP:NF_STOP)); /* accept but no more firewall */
467 ip_output(struct mbuf *m, struct mbuf __unused *opt,
468 struct route __unused *ro, int __unused flags,
469 struct ip_moptions __unused *imo, struct inpcb __unused *inp)
471 netisr_dispatch(0, m);
476 * socket lookup function for linux.
477 * This code is used to associate uid, gid, jail/xid to packets,
478 * and store the info in a cache *ugp where they can be accessed quickly.
479 * The function returns 1 if the info is found, -1 otherwise.
481 * We do this only on selected protocols: TCP, ...
483 * The chain is the following
484 * sk_buff* sock* socket* file*
485 * skb -> sk ->sk_socket->file ->f_owner ->pid
486 * skb -> sk ->sk_socket->file ->f_uid (direct)
487 * skb -> sk ->sk_socket->file ->f_cred->fsuid (2.6.29+)
490 * linux/skbuff.h struct skbuff
491 * net/sock.h struct sock
492 * linux/net.h struct socket
493 * linux/fs.h struct file
495 * With vserver we may have sk->sk_xid and sk->sk_nid that
496 * which we store in fw_groups[1] (matches O_JAIL) and fw_groups[2]
499 * Note- for locally generated, outgoing packets we should not need
500 * need a lookup because the sk_buff already points to the socket where
503 extern struct inet_hashinfo tcp_hashinfo;
505 linux_lookup(const int proto, const __be32 saddr, const __be16 sport,
506 const __be32 daddr, const __be16 dport,
507 struct sk_buff *skb, int dir, struct bsd_ucred *u)
509 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,0)
513 int ret = -1; /* default return value */
514 int st = -1; /* state */
517 if (proto != IPPROTO_TCP) /* XXX extend for UDP */
520 if ((dir ? (void *)skb_dst(skb) : (void *)skb->dev) == NULL) {
521 panic(" -- this should not happen\n");
529 * Try a lookup. On a match, sk has a refcount that we must
530 * release on exit (we know it because skb->sk = NULL).
532 * inet_lookup above 2.6.24 has an additional 'net' parameter
533 * so we use a macro to conditionally supply it.
534 * swap dst and src depending on the direction.
536 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,24)
539 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26)
540 /* there is no dev_net() on 2.6.25 */
541 #define _OPT_NET_ARG (skb->dev->nd_net),
542 #else /* 2.6.26 and above */
543 #define _OPT_NET_ARG dev_net(skb->dev),
546 sk = (dir) ? /* dir != 0 on output */
547 inet_lookup(_OPT_NET_ARG &tcp_hashinfo,
548 daddr, dport, saddr, sport, // match outgoing
550 inet_lookup(_OPT_NET_ARG &tcp_hashinfo,
551 saddr, sport, daddr, dport, // match incoming
555 if (sk == NULL) /* no match, nothing to be done */
558 ret = 1; /* retrying won't make things better */
560 #ifdef CONFIG_VSERVER
567 * Exclude tcp states where sk points to a inet_timewait_sock which
568 * has no sk_socket field (surely TCP_TIME_WAIT, perhaps more).
569 * To be safe, use a whitelist and not a blacklist.
570 * Before dereferencing sk_socket grab a lock on sk_callback_lock.
572 * Once again we need conditional code because the UID and GID
573 * location changes between kernels.
575 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,28)
576 /* use the current's real uid/gid */
577 #define _CURR_UID f_uid
578 #define _CURR_GID f_gid
579 #else /* 2.6.29 and above */
580 /* use the current's file access real uid/gid */
581 #define _CURR_UID f_cred->fsuid
582 #define _CURR_GID f_cred->fsgid
585 #define GOOD_STATES ( \
586 (1<<TCP_LISTEN) | (1<<TCP_SYN_RECV) | (1<<TCP_SYN_SENT) | \
587 (1<<TCP_ESTABLISHED) | (1<<TCP_FIN_WAIT1) | (1<<TCP_FIN_WAIT2) )
588 // surely exclude TCP_CLOSE, TCP_TIME_WAIT, TCP_LAST_ACK
589 // uncertain TCP_CLOSE_WAIT and TCP_CLOSING
591 if ((1<<st) & GOOD_STATES) {
592 read_lock_bh(&sk->sk_callback_lock);
593 if (sk->sk_socket && sk->sk_socket->file) {
594 u->uid = sk->sk_socket->file->_CURR_UID;
595 u->gid = sk->sk_socket->file->_CURR_GID;
597 read_unlock_bh(&sk->sk_callback_lock);
601 if (!skb->sk) /* return the reference that came from the lookup */
608 #endif /* LINUX > 2.4 */
612 * Now prepare to hook the various functions.
613 * Linux 2.4 has a different API so we need some adaptation
614 * for register and unregister hooks
616 * the unregister function changed arguments between 2.6.22 and 2.6.24
618 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
620 nf_register_hooks(struct nf_hook_ops *ops, int n)
623 for (i = 0; i < n; i++) {
624 ret = nf_register_hook(ops + i);
632 nf_unregister_hooks(struct nf_hook_ops *ops, int n)
635 for (i = 0; i < n; i++) {
636 nf_unregister_hook(ops + i);
639 #define REG_QH_ARG(fn) fn, NULL /* argument for nf_[un]register_queue_handler */
640 #define UNREG_QH_ARG(fn) //fn /* argument for nf_[un]register_queue_handler */
641 #define SET_MOD_OWNER
643 #else /* linux >= 2.6.0 */
645 struct nf_queue_handler ipfw2_queue_handler_desc = {
646 .outfn = ipfw2_queue_handler,
647 .name = "ipfw2 dummynet queue",
649 #define REG_QH_ARG(fn) &(fn ## _desc)
651 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24)
652 #define UNREG_QH_ARG(fn) //fn /* argument for nf_[un]register_queue_handler */
654 #define UNREG_QH_ARG(fn) , &(fn ## _desc)
655 #endif /* 2.6.0 < LINUX > 2.6.24 */
657 #define SET_MOD_OWNER .owner = THIS_MODULE,
659 #endif /* !LINUX < 2.6.0 */
661 static struct nf_hook_ops ipfw_ops[] __read_mostly = {
665 .hooknum = IPFW_HOOK_IN,
666 .priority = NF_IP_PRI_FILTER,
672 .hooknum = NF_IP_POST_ROUTING,
673 .priority = NF_IP_PRI_FILTER,
677 #endif /* !__linux__ */
679 /* descriptors for the children, until i find a way for the
680 * linker to produce them
682 extern moduledata_t *moddesc_ipfw;
683 extern moduledata_t *moddesc_dummynet;
684 extern void *sysinit_ipfw_init;
685 extern void *sysuninit_ipfw_destroy;
686 extern void *sysinit_vnet_ipfw_init;
687 extern void *sysuninit_vnet_ipfw_uninit;
690 * Module glue - init and exit function.
693 ipfw_module_init(void)
697 printf("%s in-hook %d svn id %s\n", __FUNCTION__, IPFW_HOOK_IN, "$Id: ipfw2_mod.c 4671 2010-01-04 17:50:51Z luigi $");
701 my_mod_register("ipfw", 1, moddesc_ipfw, NULL, NULL);
702 my_mod_register("sy_ipfw", 2, NULL,
703 sysinit_ipfw_init, sysuninit_ipfw_destroy);
704 my_mod_register("sy_Vnet_ipfw", 3, NULL,
705 sysinit_vnet_ipfw_init, sysuninit_vnet_ipfw_uninit);
706 my_mod_register("dummynet", 4, moddesc_dummynet, NULL, NULL);
712 #else /* linux hook */
713 /* sockopt register, in order to talk with user space */
714 ret = nf_register_sockopt(&ipfw_sockopts);
716 printf("error %d in nf_register_sockopt\n", ret);
720 /* queue handler registration, in order to get network
721 * packet under a private queue */
722 ret = nf_register_queue_handler(PF_INET, REG_QH_ARG(ipfw2_queue_handler) );
723 if (ret < 0) /* queue busy */
724 goto unregister_sockopt;
726 ret = nf_register_hooks(ipfw_ops, ARRAY_SIZE(ipfw_ops));
728 goto unregister_sockopt;
730 printf("%s loaded\n", __FUNCTION__);
734 /* handle errors on load */
736 nf_unregister_queue_handler(PF_INET UNREG_QH_ARG(ipfw2_queue_handler) );
737 nf_unregister_sockopt(&ipfw_sockopts);
741 printf("%s error\n", __FUNCTION__);
747 /* module shutdown */
749 ipfw_module_exit(void)
752 #else /* linux hook */
753 nf_unregister_hooks(ipfw_ops, ARRAY_SIZE(ipfw_ops));
754 /* maybe drain the queue before unregistering ? */
755 nf_unregister_queue_handler(PF_INET UNREG_QH_ARG(ipfw2_queue_handler) );
756 nf_unregister_sockopt(&ipfw_sockopts);
761 printf("%s unloaded\n", __FUNCTION__);
765 module_init(ipfw_module_init)
766 module_exit(ipfw_module_exit)
767 MODULE_LICENSE("Dual BSD/GPL"); /* the code here is all BSD. */