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Convert IPDIVERT into a loadable module. This makes use of the dynamic loadability

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of protocols.  The call to divert_packet() is done through a function pointer.  All
semantics of IPDIVERT remain intact.  If IPDIVERT is not loaded ipfw will refuse to
install divert rules and  natd will complain about 'protocol not supported'.  Once
it is loaded both will work and accept rules and open the divert socket.  The module
can only be unloaded if no divert sockets are open.  It does not close any divert
sockets when an unload is requested but will return EBUSY instead.
This commit is contained in:
Andre Oppermann 2004-10-19 21:14:57 +00:00
parent 969bb53e80
commit 72584fd2c0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=136714
6 changed files with 100 additions and 37 deletions
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8
sys/modules/ipdivert/Makefile Normal file
View File

@ -0,0 +1,8 @@
# $FreeBSD$
.PATH: ${.CURDIR}/../../netinet
KMOD= ipdivert
SRCS= ip_divert.c
.include <bsd.kmod.mk>

13
sys/netinet/in_proto.c
View File

@ -30,7 +30,6 @@
* $FreeBSD$
*/
#include "opt_ipdivert.h"
#include "opt_ipx.h"
#include "opt_mrouting.h"
#include "opt_ipsec.h"
@ -54,7 +53,6 @@
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/ip_icmp.h>
#include <netinet/ip_divert.h>
#include <netinet/igmp_var.h>
#ifdef PIM
#include <netinet/pim_var.h>
@ -215,14 +213,6 @@ struct protosw inetsw[] = {
&rip_usrreqs
},
#endif
#ifdef IPDIVERT
{ SOCK_RAW, &inetdomain, IPPROTO_DIVERT, PR_ATOMIC|PR_ADDR,
div_input, 0, div_ctlinput, ip_ctloutput,
0,
div_init, 0, 0, 0,
&div_usrreqs,
},
#endif
#ifdef IPXIP
{ SOCK_RAW, &inetdomain, IPPROTO_IDP, PR_ATOMIC|PR_ADDR|PR_LASTHDR,
ipxip_input, 0, ipxip_ctlinput, 0,
@ -297,9 +287,6 @@ SYSCTL_NODE(_net_inet, IPPROTO_AH, ipsec, CTLFLAG_RW, 0, "IPSEC");
#endif /* IPSEC */
#endif /* !FAST_IPSEC */
SYSCTL_NODE(_net_inet, IPPROTO_RAW, raw, CTLFLAG_RW, 0, "RAW");
#ifdef IPDIVERT
SYSCTL_NODE(_net_inet, IPPROTO_DIVERT, divert, CTLFLAG_RW, 0, "DIVERT");
#endif
#ifdef PIM
SYSCTL_NODE(_net_inet, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM");
#endif

75
sys/netinet/ip_divert.c
View File

@ -29,15 +29,13 @@
* $FreeBSD$
*/
#if !defined(KLD_MODULE)
#include "opt_inet.h"
#include "opt_ipfw.h"
#include "opt_ipdivert.h"
#include "opt_ipsec.h"
#include "opt_mac.h"
#ifndef INET
#error "IPDIVERT requires INET."
#endif
#endif
#include <sys/param.h>
#include <sys/kernel.h>
@ -45,6 +43,8 @@
#include <sys/malloc.h>
#include <sys/mac.h>
#include <sys/mbuf.h>
#include <sys/module.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/protosw.h>
#include <sys/signalvar.h>
@ -102,7 +102,7 @@
* will cause it to be effectively considered as a standard packet).
*/
/* Internal variables */
/* Internal variables. */
static struct inpcbhead divcb;
static struct inpcbinfo divcbinfo;
@ -147,7 +147,7 @@ div_input(struct mbuf *m, int off)
* Setup generic address and protocol structures for div_input routine,
* then pass them along with mbuf chain.
*/
void
static void
divert_packet(struct mbuf *m, int incoming)
{
struct ip *ip;
@ -650,10 +650,11 @@ div_peeraddr(struct socket *so, struct sockaddr **nam)
return (in_setpeeraddr(so, nam, &divcbinfo));
}
SYSCTL_DECL(_net_inet_divert);
#ifdef SYSCTL_NODE
SYSCTL_NODE(_net_inet, IPPROTO_DIVERT, divert, CTLFLAG_RW, 0, "IPDIVERT");
SYSCTL_PROC(_net_inet_divert, OID_AUTO, pcblist, CTLFLAG_RD, 0, 0,
div_pcblist, "S,xinpcb", "List of active divert sockets");
#endif
struct pr_usrreqs div_usrreqs = {
div_abort, pru_accept_notsupp, div_attach, div_bind,
@ -662,3 +663,61 @@ struct pr_usrreqs div_usrreqs = {
pru_rcvoob_notsupp, div_send, pru_sense_null, div_shutdown,
div_sockaddr, sosend, soreceive, sopoll, in_pcbsosetlabel
};
struct protosw div_protosw = {
SOCK_RAW, NULL, IPPROTO_DIVERT, PR_ATOMIC|PR_ADDR,
div_input, NULL, div_ctlinput, ip_ctloutput,
NULL,
div_init, NULL, NULL, NULL,
&div_usrreqs
};
static int
div_modevent(module_t mod, int type, void *unused)
{
int err = 0;
int n;
switch (type) {
case MOD_LOAD:
/*
* Protocol will be initialized by pf_proto_register().
* We don't have to register ip_protox because we are not
* a true IP protocol that goes over the wire.
*/
err = pf_proto_register(PF_INET, &div_protosw);
ip_divert_ptr = divert_packet;
break;
case MOD_UNLOAD:
/*
* Module ipdivert can only be unloaded if no sockets are
* connected. Maybe this can be changed later to forcefully
* disconnect any open sockets.
*/
INP_INFO_RLOCK(&divcbinfo);
n = divcbinfo.ipi_count;
INP_INFO_RUNLOCK(&divcbinfo);
if (n != 0) {
err = EBUSY;
break;
}
ip_divert_ptr = NULL;
err = pf_proto_unregister(PF_INET, IPPROTO_DIVERT, SOCK_RAW);
INP_INFO_LOCK_DESTROY(&divcbinfo);
break;
default:
return EINVAL;
break;
}
return err;
}
static moduledata_t ipdivertmod = {
"ipdivert",
div_modevent,
0
};
DECLARE_MODULE(ipdivert, ipdivertmod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY);
MODULE_DEPEND(dummynet, ipfw, 2, 2, 2);
MODULE_VERSION(ipdivert, 1);

14
sys/netinet/ip_divert.h
View File

@ -35,10 +35,16 @@
#ifndef _NETINET_IP_DIVERT_H_
#define _NETINET_IP_DIVERT_H_
/*
* Sysctl declaration.
*/
#ifdef SYSCTL_DECL
SYSCTL_DECL(_net_inet_divert);
#endif
/*
* Divert socket definitions.
*/
struct divert_tag {
u_int32_t info; /* port & flags */
u_int16_t cookie; /* ipfw rule number */
@ -74,10 +80,10 @@ divert_find_info(struct mbuf *m)
return mtag ? divert_info(mtag) : 0;
}
typedef void ip_divert_packet_t(struct mbuf *m, int incoming);
extern ip_divert_packet_t *ip_divert_ptr;
extern void div_init(void);
extern void div_input(struct mbuf *, int);
extern void div_ctlinput(int, struct sockaddr *, void *);
extern void divert_packet(struct mbuf *m, int incoming);
extern struct mbuf *divert_clone(struct mbuf *);
extern struct pr_usrreqs div_usrreqs;
#endif /* _NETINET_IP_DIVERT_H_ */

6
sys/netinet/ip_fw2.c
View File

@ -35,7 +35,6 @@
#if !defined(KLD_MODULE)
#include "opt_ipfw.h"
#include "opt_ipdn.h"
#include "opt_ipdivert.h"
#include "opt_inet.h"
#include "opt_ipsec.h"
#ifndef INET
@ -3077,9 +3076,8 @@ check_ipfw_struct(struct ip_fw *rule, int size)
case O_DIVERT:
case O_TEE:
#ifndef IPDIVERT
return EINVAL;
#endif
if (ip_divert_ptr == NULL)
return EINVAL;
case O_FORWARD_MAC: /* XXX not implemented yet */
case O_CHECK_STATE:
case O_COUNT:

21
sys/netinet/ip_fw_pfil.c
View File

@ -29,7 +29,6 @@
#if !defined(KLD_MODULE)
#include "opt_ipfw.h"
#include "opt_ipdn.h"
#include "opt_ipdivert.h"
#include "opt_inet.h"
#ifndef INET
#error IPFIREWALL requires INET.
@ -67,11 +66,14 @@ static int ipfw_pfil_hooked = 0;
/* Dummynet hooks. */
ip_dn_ruledel_t *ip_dn_ruledel_ptr = NULL;
/* Divert hooks. */
ip_divert_packet_t *ip_divert_ptr = NULL;
/* Forward declarations. */
static int ipfw_divert(struct mbuf **, int, int);
#define DIV_DIR_IN 1
#define DIV_DIR_OUT 0
static int ipfw_divert(struct mbuf **, int, int);
int
ipfw_check_in(void *arg, struct mbuf **m0, struct ifnet *ifp, int dir,
struct inpcb *inp)
@ -255,13 +257,16 @@ ipfw_divert(struct mbuf **m, int incoming, int tee)
* If tee is set, copy packet and return original.
* If not tee, consume packet and send it to divert socket.
*/
#ifdef IPDIVERT
struct mbuf *clone, *reass;
struct ip *ip;
int hlen;
reass = NULL;
/* Is divert module loaded? */
if (ip_divert_ptr == NULL)
goto nodivert;
/* Cloning needed for tee? */
if (tee)
clone = m_dup(*m, M_DONTWAIT);
@ -309,8 +314,8 @@ ipfw_divert(struct mbuf **m, int incoming, int tee)
}
/* Do the dirty job... */
if (clone)
divert_packet(clone, incoming);
if (clone && ip_divert_ptr != NULL)
ip_divert_ptr(clone, incoming);
teeout:
/*
@ -322,10 +327,10 @@ ipfw_divert(struct mbuf **m, int incoming, int tee)
/* Packet diverted and consumed */
return 1;
#else
nodivert:
m_freem(*m);
return 1;
#endif /* ipdivert */
}
static int