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freebsd-skq/sys/netinet/ip_auth.c
jlemon 954e1d2ccd Lock down the network interface queues. The queue mutex must be obtained 
before adding/removing packets from the queue.  Also, the if_obytes and
if_omcasts fields should only be manipulated under protection of the mutex.

IF_ENQUEUE, IF_PREPEND, and IF_DEQUEUE perform all necessary locking on
the queue.  An IF_LOCK macro is provided, as well as the old (mutex-less)
versions of the macros in the form _IF_ENQUEUE, _IF_QFULL, for code which
needs them, but their use is discouraged.

Two new macros are introduced: IF_DRAIN() to drain a queue, and IF_HANDOFF,
which takes care of locking/enqueue, and also statistics updating/start
if necessary.
2000-11-25 07:35:38 +00:00

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/*
* Copyright (C) 1998-2000 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[] = "@(#)$Id: ip_auth.c,v 2.1.2.2 2000/01/16 10:12:14 darrenr Exp $";*/
static const char rcsid[] = "@(#)$FreeBSD$";
#endif
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/file.h>
#if !defined(_KERNEL) && !defined(KERNEL)
# include <stdio.h>
# include <stdlib.h>
# include <string.h>
#endif
#if (defined(KERNEL) || 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(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>
# ifdef _KERNEL
# include <sys/dditypes.h>
# endif
# include <sys/stream.h>
# include <sys/kmem.h>
#endif
#if (_BSDI_VERSION >= 199802) || (__FreeBSD_version >= 400000)
# include <sys/queue.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
#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
# if __FreeBSD_version >= 300000
# include <net/if_var.h>
# endif
# 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 (__FreeBSD_version >= 300000)
# include <sys/malloc.h>
# if (defined(_KERNEL) || defined(KERNEL)) && !defined(IPFILTER_LKM)
# include <sys/libkern.h>
# include <sys/systm.h>
# endif
#endif
#if (SOLARIS || defined(__sgi)) && defined(_KERNEL)
extern KRWLOCK_T ipf_auth;
extern kmutex_t ipf_authmx;
# 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;
int fr_auth_lock = 0;
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.
*/
u_32_t fr_checkauth(ip, fin)
ip_t *ip;
fr_info_t *fin;
{
u_short id = ip->ip_id;
u_32_t pass;
int i;
if (fr_auth_lock)
return 0;
READ_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;
RWLOCK_EXIT(&ipf_auth);
WRITE_ENTER(&ipf_auth);
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;
}
}
RWLOCK_EXIT(&ipf_auth);
return pass;
}
i++;
if (i == FR_NUMAUTH)
i = 0;
}
fr_authstats.fas_miss++;
RWLOCK_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)
mb_t *m;
fr_info_t *fin;
ip_t *ip;
{
#if defined(_KERNEL) && SOLARIS
qif_t *qif = fin->fin_qif;
#endif
int i;
if (fr_auth_lock)
return 0;
WRITE_ENTER(&ipf_auth);
if (fr_authstart > fr_authend) {
fr_authstats.fas_nospace++;
RWLOCK_EXIT(&ipf_auth);
return 0;
} else {
if ((fr_authstart == 0) && (fr_authend == FR_NUMAUTH - 1)) {
fr_authstats.fas_nospace++;
RWLOCK_EXIT(&ipf_auth);
return 0;
}
}
fr_authstats.fas_added++;
fr_authused++;
i = fr_authend++;
if (fr_authend == FR_NUMAUTH)
fr_authend = 0;
RWLOCK_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) && (ip->ip_v == 4))
# endif
{
register u_short bo;
bo = ip->ip_len;
ip->ip_len = htons(bo);
# if !SOLARIS && !defined(__NetBSD__) && !defined(__FreeBSD__)
/* 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;
frauth_t auth, *au = &auth;
frauthent_t *fae, **faep;
int i, error = 0;
switch (cmd)
{
case SIOCSTLCK :
error = fr_lock(data, &fr_auth_lock);
break;
case SIOCINIFR :
case SIOCRMIFR :
case SIOCADIFR :
error = EINVAL;
break;
case SIOCINAFR :
error = EINVAL;
break;
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 {
WRITE_ENTER(&ipf_auth);
*faep = fae->fae_next;
*frptr = fr->fr_next;
RWLOCK_EXIT(&ipf_auth);
KFREE(fae);
}
} else {
KMALLOC(fae, frauthent_t *);
if (fae != NULL) {
bcopy((char *)fr, (char *)&fae->fae_fr,
sizeof(*fr));
WRITE_ENTER(&ipf_auth);
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;
ipauth = &fae_list->fae_fr;
RWLOCK_EXIT(&ipf_auth);
} else
error = ENOMEM;
}
break;
case SIOCATHST:
READ_ENTER(&ipf_auth);
fr_authstats.fas_faelist = fae_list;
RWLOCK_EXIT(&ipf_auth);
error = IWCOPYPTR((char *)&fr_authstats, data,
sizeof(fr_authstats));
break;
case SIOCAUTHW:
fr_authioctlloop:
READ_ENTER(&ipf_auth);
if ((fr_authnext != fr_authend) && fr_authpkts[fr_authnext]) {
error = IWCOPYPTR((char *)&fr_auth[fr_authnext], data,
sizeof(fr_info_t));
RWLOCK_EXIT(&ipf_auth);
if (error)
break;
WRITE_ENTER(&ipf_auth);
fr_authnext++;
if (fr_authnext == FR_NUMAUTH)
fr_authnext = 0;
RWLOCK_EXIT(&ipf_auth);
return 0;
}
#ifdef _KERNEL
# if SOLARIS
mutex_enter(&ipf_authmx);
if (!cv_wait_sig(&ipfauthwait, &ipf_authmx)) {
mutex_exit(&ipf_authmx);
return EINTR;
}
mutex_exit(&ipf_authmx);
# else
# ifdef linux
interruptible_sleep_on(&ipfauthwait);
if (current->signal & ~current->blocked)
error = -EINTR;
# else
error = SLEEP(&fr_authnext, "fr_authnext");
# endif
# endif
#endif
RWLOCK_EXIT(&ipf_auth);
if (!error)
goto fr_authioctlloop;
break;
case SIOCAUTHR:
error = IRCOPYPTR(data, (caddr_t)&auth, sizeof(auth));
if (error)
return error;
WRITE_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)) {
RWLOCK_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
RWLOCK_EXIT(&ipf_auth);
# ifndef linux
if (m && au->fra_info.fin_out) {
# if SOLARIS
error = fr_qout(fr_auth[i].fra_q, m);
# else /* SOLARIS */
# if (_BSDI_VERSION >= 199802) || defined(__OpenBSD__)
error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL,
NULL);
# else
error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL);
# endif
# 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 */
if (! IF_HANDOFF(&ipintrq, m, NULL))
error = ENOBUFS;
else
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
#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;
WRITE_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);
}
ipauth = NULL;
RWLOCK_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
if (fr_auth_lock)
return;
SPL_NET(s);
WRITE_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 (!--fae->fae_age) {
*faep = fae->fae_next;
KFREE(fae);
fr_authstats.fas_expire++;
} else
faep = &fae->fae_next;
}
ipauth = &fae_list->fae_fr;
RWLOCK_EXIT(&ipf_auth);
SPL_X(s);
}
#endif
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