509 lines
11 KiB
C
509 lines
11 KiB
C
/*
|
|
* Copyright (C) 1997 by Darren Reed & Guido van Rooij.
|
|
*
|
|
* Redistribution and use in source and binary forms are permitted
|
|
* provided that this notice is preserved and due credit is given
|
|
* to the original author and the contributors.
|
|
*/
|
|
#if !defined(lint)
|
|
static const char rcsid[] = "@(#)$FreeBSD$";
|
|
#endif
|
|
|
|
#if defined(KERNEL) && !defined(_KERNEL)
|
|
#define _KERNEL
|
|
#endif
|
|
#define __FreeBSD_version 300000 /* just a hack - no <sys/osreldate.h> */
|
|
|
|
#if !defined(_KERNEL) && !defined(KERNEL)
|
|
# include <stdlib.h>
|
|
# include <string.h>
|
|
#endif
|
|
#include <sys/errno.h>
|
|
#include <sys/types.h>
|
|
#include <sys/param.h>
|
|
#include <sys/time.h>
|
|
#include <sys/file.h>
|
|
#if defined(KERNEL) && (__FreeBSD_version >= 220000)
|
|
# include <sys/filio.h>
|
|
# include <sys/fcntl.h>
|
|
#else
|
|
# include <sys/ioctl.h>
|
|
#endif
|
|
#include <sys/uio.h>
|
|
#ifndef linux
|
|
# include <sys/protosw.h>
|
|
#endif
|
|
#include <sys/socket.h>
|
|
#if defined(_KERNEL) && !defined(linux)
|
|
# include <sys/systm.h>
|
|
#endif
|
|
#if !defined(__SVR4) && !defined(__svr4__)
|
|
# ifndef linux
|
|
# include <sys/mbuf.h>
|
|
# endif
|
|
#else
|
|
# include <sys/filio.h>
|
|
# include <sys/byteorder.h>
|
|
# include <sys/dditypes.h>
|
|
# include <sys/stream.h>
|
|
# include <sys/kmem.h>
|
|
#endif
|
|
#if defined(KERNEL) && (__FreeBSD_version >= 300000)
|
|
# include <sys/malloc.h>
|
|
#endif
|
|
#if defined(__NetBSD__) || defined(__OpenBSD__) || defined(bsdi)
|
|
# include <machine/cpu.h>
|
|
#endif
|
|
#include <net/if.h>
|
|
#ifdef sun
|
|
#include <net/af.h>
|
|
#endif
|
|
#if !defined(KERNEL) && (__FreeBSD_version >= 300000)
|
|
# include <net/if_var.h>
|
|
#endif
|
|
#include <net/route.h>
|
|
#include <netinet/in.h>
|
|
#include <netinet/in_systm.h>
|
|
#include <netinet/ip.h>
|
|
#ifndef KERNEL
|
|
#define KERNEL
|
|
#define NOT_KERNEL
|
|
#endif
|
|
#ifndef linux
|
|
# include <netinet/ip_var.h>
|
|
#endif
|
|
#ifdef NOT_KERNEL
|
|
#undef KERNEL
|
|
#endif
|
|
#ifdef __sgi
|
|
# ifdef IFF_DRVRLOCK /* IRIX6 */
|
|
#include <sys/hashing.h>
|
|
# endif
|
|
#endif
|
|
#include <netinet/tcp.h>
|
|
#if defined(__sgi) && !defined(IFF_DRVRLOCK) /* IRIX < 6 */
|
|
extern struct ifqueue ipintrq; /* ip packet input queue */
|
|
#else
|
|
# ifndef linux
|
|
# include <netinet/in_var.h>
|
|
# include <netinet/tcp_fsm.h>
|
|
# endif
|
|
#endif
|
|
#include <netinet/udp.h>
|
|
#include <netinet/ip_icmp.h>
|
|
#include "netinet/ip_compat.h"
|
|
#include <netinet/tcpip.h>
|
|
#include "netinet/ip_fil.h"
|
|
#include "netinet/ip_auth.h"
|
|
#if !SOLARIS && !defined(linux)
|
|
# include <net/netisr.h>
|
|
# ifdef __FreeBSD__
|
|
# include <machine/cpufunc.h>
|
|
# endif
|
|
#endif
|
|
|
|
|
|
#if (SOLARIS || defined(__sgi)) && defined(_KERNEL)
|
|
extern kmutex_t ipf_auth;
|
|
# if SOLARIS
|
|
extern kcondvar_t ipfauthwait;
|
|
# endif
|
|
#endif
|
|
#ifdef linux
|
|
static struct wait_queue *ipfauthwait = NULL;
|
|
#endif
|
|
|
|
int fr_authsize = FR_NUMAUTH;
|
|
int fr_authused = 0;
|
|
int fr_defaultauthage = 600;
|
|
fr_authstat_t fr_authstats;
|
|
static frauth_t fr_auth[FR_NUMAUTH];
|
|
mb_t *fr_authpkts[FR_NUMAUTH];
|
|
static int fr_authstart = 0, fr_authend = 0, fr_authnext = 0;
|
|
static frauthent_t *fae_list = NULL;
|
|
frentry_t *ipauth = NULL;
|
|
|
|
|
|
/*
|
|
* Check if a packet has authorization. If the packet is found to match an
|
|
* authorization result and that would result in a feedback loop (i.e. it
|
|
* will end up returning FR_AUTH) then return FR_BLOCK instead.
|
|
*/
|
|
int fr_checkauth(ip, fin)
|
|
ip_t *ip;
|
|
fr_info_t *fin;
|
|
{
|
|
u_short id = ip->ip_id;
|
|
u_32_t pass;
|
|
int i;
|
|
|
|
MUTEX_ENTER(&ipf_auth);
|
|
for (i = fr_authstart; i != fr_authend; ) {
|
|
/*
|
|
* index becomes -2 only after an SIOCAUTHW. Check this in
|
|
* case the same packet gets sent again and it hasn't yet been
|
|
* auth'd.
|
|
*/
|
|
if ((fr_auth[i].fra_index == -2) &&
|
|
(id == fr_auth[i].fra_info.fin_id) &&
|
|
!bcmp((char *)fin,(char *)&fr_auth[i].fra_info,FI_CSIZE)) {
|
|
/*
|
|
* Avoid feedback loop.
|
|
*/
|
|
if (!(pass = fr_auth[i].fra_pass) || (pass & FR_AUTH))
|
|
pass = FR_BLOCK;
|
|
fr_authstats.fas_hits++;
|
|
fr_auth[i].fra_index = -1;
|
|
fr_authused--;
|
|
if (i == fr_authstart) {
|
|
while (fr_auth[i].fra_index == -1) {
|
|
i++;
|
|
if (i == FR_NUMAUTH)
|
|
i = 0;
|
|
fr_authstart = i;
|
|
if (i == fr_authend)
|
|
break;
|
|
}
|
|
if (fr_authstart == fr_authend) {
|
|
fr_authnext = 0;
|
|
fr_authstart = fr_authend = 0;
|
|
}
|
|
}
|
|
MUTEX_EXIT(&ipf_auth);
|
|
return pass;
|
|
}
|
|
i++;
|
|
if (i == FR_NUMAUTH)
|
|
i = 0;
|
|
}
|
|
fr_authstats.fas_miss++;
|
|
MUTEX_EXIT(&ipf_auth);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Check if we have room in the auth array to hold details for another packet.
|
|
* If we do, store it and wake up any user programs which are waiting to
|
|
* hear about these events.
|
|
*/
|
|
int fr_newauth(m, fin, ip
|
|
#if defined(_KERNEL) && SOLARIS
|
|
, qif)
|
|
qif_t *qif;
|
|
#else
|
|
)
|
|
#endif
|
|
mb_t *m;
|
|
fr_info_t *fin;
|
|
ip_t *ip;
|
|
{
|
|
int i;
|
|
|
|
MUTEX_ENTER(&ipf_auth);
|
|
if ((fr_authstart > fr_authend) && (fr_authstart - fr_authend == -1)) {
|
|
fr_authstats.fas_nospace++;
|
|
MUTEX_EXIT(&ipf_auth);
|
|
return 0;
|
|
}
|
|
if (fr_authend - fr_authstart == FR_NUMAUTH - 1) {
|
|
fr_authstats.fas_nospace++;
|
|
MUTEX_EXIT(&ipf_auth);
|
|
return 0;
|
|
}
|
|
|
|
fr_authstats.fas_added++;
|
|
fr_authused++;
|
|
i = fr_authend++;
|
|
if (fr_authend == FR_NUMAUTH)
|
|
fr_authend = 0;
|
|
MUTEX_EXIT(&ipf_auth);
|
|
fr_auth[i].fra_index = i;
|
|
fr_auth[i].fra_pass = 0;
|
|
fr_auth[i].fra_age = fr_defaultauthage;
|
|
bcopy((char *)fin, (char *)&fr_auth[i].fra_info, sizeof(*fin));
|
|
#if !defined(sparc) && !defined(m68k)
|
|
/*
|
|
* No need to copyback here as we want to undo the changes, not keep
|
|
* them.
|
|
*/
|
|
# if SOLARIS && defined(_KERNEL)
|
|
if (ip == (ip_t *)m->b_rptr)
|
|
# endif
|
|
{
|
|
register u_short bo;
|
|
|
|
bo = ip->ip_len;
|
|
ip->ip_len = htons(bo);
|
|
# if !SOLARIS /* 4.4BSD converts this ip_input.c, but I don't in solaris.c */
|
|
bo = ip->ip_id;
|
|
ip->ip_id = htons(bo);
|
|
# endif
|
|
bo = ip->ip_off;
|
|
ip->ip_off = htons(bo);
|
|
}
|
|
#endif
|
|
#if SOLARIS && defined(_KERNEL)
|
|
m->b_rptr -= qif->qf_off;
|
|
fr_authpkts[i] = *(mblk_t **)fin->fin_mp;
|
|
fr_auth[i].fra_q = qif->qf_q;
|
|
cv_signal(&ipfauthwait);
|
|
#else
|
|
fr_authpkts[i] = m;
|
|
# if defined(linux) && defined(_KERNEL)
|
|
wake_up_interruptible(&ipfauthwait);
|
|
# else
|
|
WAKEUP(&fr_authnext);
|
|
# endif
|
|
#endif
|
|
return 1;
|
|
}
|
|
|
|
|
|
int fr_auth_ioctl(data, cmd, fr, frptr)
|
|
caddr_t data;
|
|
#if defined(__NetBSD__) || defined(__OpenBSD__) || (__FreeBSD_version >= 300003)
|
|
u_long cmd;
|
|
#else
|
|
int cmd;
|
|
#endif
|
|
frentry_t *fr, **frptr;
|
|
{
|
|
mb_t *m;
|
|
#if defined(_KERNEL)
|
|
# if !SOLARIS
|
|
struct ifqueue *ifq;
|
|
int s;
|
|
# endif
|
|
#endif
|
|
frauth_t auth, *au = &auth;
|
|
frauthent_t *fae, **faep;
|
|
int i, error = 0;
|
|
|
|
switch (cmd)
|
|
{
|
|
case SIOCINIFR :
|
|
case SIOCRMIFR :
|
|
case SIOCADIFR :
|
|
error = EINVAL;
|
|
break;
|
|
case SIOCINAFR :
|
|
case SIOCRMAFR :
|
|
case SIOCADAFR :
|
|
for (faep = &fae_list; (fae = *faep); )
|
|
if (&fae->fae_fr == fr)
|
|
break;
|
|
else
|
|
faep = &fae->fae_next;
|
|
if (cmd == SIOCRMAFR) {
|
|
if (!fae)
|
|
error = ESRCH;
|
|
else {
|
|
*faep = fae->fae_next;
|
|
*frptr = fr->fr_next;
|
|
KFREE(fae);
|
|
}
|
|
} else {
|
|
KMALLOC(fae, frauthent_t *, sizeof(*fae));
|
|
if (fae != NULL) {
|
|
IRCOPY((char *)data, (char *)&fae->fae_fr,
|
|
sizeof(fae->fae_fr));
|
|
if (!fae->fae_age)
|
|
fae->fae_age = fr_defaultauthage;
|
|
fae->fae_fr.fr_hits = 0;
|
|
fae->fae_fr.fr_next = *frptr;
|
|
*frptr = &fae->fae_fr;
|
|
fae->fae_next = *faep;
|
|
*faep = fae;
|
|
} else
|
|
error = ENOMEM;
|
|
}
|
|
break;
|
|
case SIOCATHST:
|
|
IWCOPY((char *)&fr_authstats, data, sizeof(fr_authstats));
|
|
break;
|
|
case SIOCAUTHW:
|
|
fr_authioctlloop:
|
|
MUTEX_ENTER(&ipf_auth);
|
|
if ((fr_authnext != fr_authend) && fr_authpkts[fr_authnext]) {
|
|
IWCOPY((char *)&fr_auth[fr_authnext++], data,
|
|
sizeof(fr_info_t));
|
|
if (fr_authnext == FR_NUMAUTH)
|
|
fr_authnext = 0;
|
|
MUTEX_EXIT(&ipf_auth);
|
|
return 0;
|
|
}
|
|
#ifdef _KERNEL
|
|
# if SOLARIS
|
|
if (!cv_wait_sig(&ipfauthwait, &ipf_auth)) {
|
|
mutex_exit(&ipf_auth);
|
|
return EINTR;
|
|
}
|
|
# else
|
|
# ifdef linux
|
|
interruptible_sleep_on(&ipfauthwait);
|
|
if (current->signal & ~current->blocked)
|
|
error = -EINTR;
|
|
# else
|
|
error = SLEEP(&fr_authnext, "fr_authnext");
|
|
# endif
|
|
# endif
|
|
#endif
|
|
MUTEX_EXIT(&ipf_auth);
|
|
if (!error)
|
|
goto fr_authioctlloop;
|
|
break;
|
|
case SIOCAUTHR:
|
|
IRCOPY(data, (caddr_t)&auth, sizeof(auth));
|
|
MUTEX_ENTER(&ipf_auth);
|
|
i = au->fra_index;
|
|
if ((i < 0) || (i > FR_NUMAUTH) ||
|
|
(fr_auth[i].fra_info.fin_id != au->fra_info.fin_id)) {
|
|
MUTEX_EXIT(&ipf_auth);
|
|
return EINVAL;
|
|
}
|
|
m = fr_authpkts[i];
|
|
fr_auth[i].fra_index = -2;
|
|
fr_auth[i].fra_pass = au->fra_pass;
|
|
fr_authpkts[i] = NULL;
|
|
#ifdef _KERNEL
|
|
MUTEX_EXIT(&ipf_auth);
|
|
SPL_NET(s);
|
|
# ifndef linux
|
|
if (m && au->fra_info.fin_out) {
|
|
# if SOLARIS
|
|
error = fr_qout(fr_auth[i].fra_q, m);
|
|
# else /* SOLARIS */
|
|
error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL);
|
|
# endif /* SOLARIS */
|
|
if (error)
|
|
fr_authstats.fas_sendfail++;
|
|
else
|
|
fr_authstats.fas_sendok++;
|
|
} else if (m) {
|
|
# if SOLARIS
|
|
error = fr_qin(fr_auth[i].fra_q, m);
|
|
# else /* SOLARIS */
|
|
ifq = &ipintrq;
|
|
if (IF_QFULL(ifq)) {
|
|
IF_DROP(ifq);
|
|
m_freem(m);
|
|
error = ENOBUFS;
|
|
} else {
|
|
IF_ENQUEUE(ifq, m);
|
|
schednetisr(NETISR_IP);
|
|
}
|
|
# endif /* SOLARIS */
|
|
if (error)
|
|
fr_authstats.fas_quefail++;
|
|
else
|
|
fr_authstats.fas_queok++;
|
|
} else
|
|
error = EINVAL;
|
|
# endif
|
|
# if SOLARIS
|
|
if (error)
|
|
error = EINVAL;
|
|
# else
|
|
/*
|
|
* If we experience an error which will result in the packet
|
|
* not being processed, make sure we advance to the next one.
|
|
*/
|
|
if (error == ENOBUFS) {
|
|
fr_authused--;
|
|
fr_auth[i].fra_index = -1;
|
|
fr_auth[i].fra_pass = 0;
|
|
if (i == fr_authstart) {
|
|
while (fr_auth[i].fra_index == -1) {
|
|
i++;
|
|
if (i == FR_NUMAUTH)
|
|
i = 0;
|
|
fr_authstart = i;
|
|
if (i == fr_authend)
|
|
break;
|
|
}
|
|
if (fr_authstart == fr_authend) {
|
|
fr_authnext = 0;
|
|
fr_authstart = fr_authend = 0;
|
|
}
|
|
}
|
|
}
|
|
# endif
|
|
SPL_X(s);
|
|
#endif /* _KERNEL */
|
|
break;
|
|
default :
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
|
|
#ifdef _KERNEL
|
|
/*
|
|
* Free all network buffer memory used to keep saved packets.
|
|
*/
|
|
void fr_authunload()
|
|
{
|
|
register int i;
|
|
register frauthent_t *fae, **faep;
|
|
mb_t *m;
|
|
|
|
MUTEX_ENTER(&ipf_auth);
|
|
for (i = 0; i < FR_NUMAUTH; i++) {
|
|
if ((m = fr_authpkts[i])) {
|
|
FREE_MB_T(m);
|
|
fr_authpkts[i] = NULL;
|
|
fr_auth[i].fra_index = -1;
|
|
}
|
|
}
|
|
|
|
|
|
for (faep = &fae_list; (fae = *faep); ) {
|
|
*faep = fae->fae_next;
|
|
KFREE(fae);
|
|
}
|
|
MUTEX_EXIT(&ipf_auth);
|
|
}
|
|
|
|
|
|
/*
|
|
* Slowly expire held auth records. Timeouts are set
|
|
* in expectation of this being called twice per second.
|
|
*/
|
|
void fr_authexpire()
|
|
{
|
|
register int i;
|
|
register frauth_t *fra;
|
|
register frauthent_t *fae, **faep;
|
|
mb_t *m;
|
|
#if !SOLARIS
|
|
int s;
|
|
#endif
|
|
|
|
SPL_NET(s);
|
|
MUTEX_ENTER(&ipf_auth);
|
|
for (i = 0, fra = fr_auth; i < FR_NUMAUTH; i++, fra++) {
|
|
if ((!--fra->fra_age) && (m = fr_authpkts[i])) {
|
|
FREE_MB_T(m);
|
|
fr_authpkts[i] = NULL;
|
|
fr_auth[i].fra_index = -1;
|
|
fr_authstats.fas_expire++;
|
|
fr_authused--;
|
|
}
|
|
}
|
|
|
|
for (faep = &fae_list; (fae = *faep); ) {
|
|
if (!--fra->fra_age) {
|
|
*faep = fae->fae_next;
|
|
KFREE(fae);
|
|
fr_authstats.fas_expire++;
|
|
} else
|
|
faep = &fae->fae_next;
|
|
}
|
|
MUTEX_EXIT(&ipf_auth);
|
|
SPL_X(s);
|
|
}
|
|
#endif
|