Rivoreo Source Code Repositories
src.rivoreo.one / net / ipfilter / 86f247c30fe5168943d0819a500a983d9bcbcac1 / . / ip_auth.c
blob: c4142964d52734a0985cbba6438baa5ffb0dbafe [file] [log] [blame] [raw]
/*
* Copyright (C) 1998-2003 by Darren Reed & Guido van Rooij.
*
* See the IPFILTER.LICENCE file for details on licencing.
*/
#if defined(KERNEL) || defined(_KERNEL)
# undef KERNEL
# undef _KERNEL
# define KERNEL 1
# define _KERNEL 1
#endif
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/file.h>
#if !defined(_KERNEL)
# include <stdio.h>
# include <stdlib.h>
# include <string.h>
# define _KERNEL
# ifdef __OpenBSD__
struct file;
# endif
# include <sys/uio.h>
# undef _KERNEL
#endif
#if defined(_KERNEL) && (__FreeBSD_version >= 220000)
# include <sys/filio.h>
# include <sys/fcntl.h>
#else
# include <sys/ioctl.h>
#endif
#if !defined(linux)
# include <sys/protosw.h>
#endif
#include <sys/socket.h>
#if defined(_KERNEL)
# include <sys/systm.h>
# if !defined(__SVR4) && !defined(__svr4__) && !defined(linux)
# include <sys/mbuf.h>
# endif
#endif
#if defined(__SVR4) || defined(__svr4__)
# 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
#if defined(_KERNEL) && defined(__NetBSD__) && (__NetBSD_Version__ >= 104000000)
# include <sys/proc.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>
#if !defined(_KERNEL) && !defined(__osf__) && !defined(__sgi)
# define KERNEL
# define _KERNEL
# define NOT_KERNEL
#endif
#if !defined(linux)
# include <netinet/ip_var.h>
#endif
#ifdef NOT_KERNEL
# undef _KERNEL
# undef KERNEL
#endif
#include <netinet/tcp.h>
#if defined(IRIX) && (IRIX < 60516) /* IRIX < 6 */
extern struct ifqueue ipintrq; /* ip packet input queue */
#else
# if !defined(__hpux) && !defined(linux)
# if __FreeBSD_version >= 300000
# include <net/if_var.h>
# if __FreeBSD_version >= 500042
# define IF_QFULL _IF_QFULL
# define IF_DROP _IF_DROP
# endif /* __FreeBSD_version >= 500042 */
# 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 !defined(MENTAT) && !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(IPFILTER_LKM)
# include <sys/libkern.h>
# include <sys/systm.h>
# endif
#endif
/* END OF INCLUDES */
#if !defined(lint)
static const char rcsid[] = "@(#)$Id$";
#endif
#if SOLARIS && defined(_KERNEL)
extern kcondvar_t ipf_auth_wait;
extern struct pollhead ipf_poll_head[IPL_LOGSIZE];
#endif /* SOLARIS */
#if defined(linux) && defined(_KERNEL)
wait_queue_head_t ipf_auth_next_linux;
#endif
int ipf_auth_size = FR_NUMAUTH;
int ipf_auth_used = 0;
int ipf_auth_defaultage = 600;
int ipf_auth_lock = 0;
int ipf_auth_inited = 0;
ipf_authstat_t ipf_auth_stats;
static frauth_t *ipf_auth = NULL;
mb_t **ipf_auth_pkts = NULL;
int ipf_auth_start = 0, ipf_auth_end = 0, ipf_auth_next = 0;
frauthent_t *ipf_auth_entries = NULL;
frentry_t *ipf_auth_ip = NULL,
*ipf_auth_rules = NULL;
void ipf_auth_deref __P((frauthent_t **));
int ipf_auth_geniter __P((ipftoken_t *, ipfgeniter_t *));
int ipf_auth_reply __P((char *));
int ipf_auth_wait __P((char *));
/* ------------------------------------------------------------------------ */
/* Function: ipf_auth_init */
/* Returns: int - 0 == success, else error */
/* Parameters: None */
/* */
/* Allocate memory and initialise data structures used in handling auth */
/* rules. */
/* ------------------------------------------------------------------------ */
int
ipf_auth_init()
{
KMALLOCS(ipf_auth, frauth_t *, ipf_auth_size * sizeof(*ipf_auth));
if (ipf_auth != NULL)
bzero((char *)ipf_auth, ipf_auth_size * sizeof(*ipf_auth));
else
return -1;
KMALLOCS(ipf_auth_pkts, mb_t **,
ipf_auth_size * sizeof(*ipf_auth_pkts));
if (ipf_auth_pkts != NULL)
bzero((char *)ipf_auth_pkts,
ipf_auth_size * sizeof(*ipf_auth_pkts));
else
return -2;
MUTEX_INIT(&ipf_auth_mx, "ipf auth log mutex");
RWLOCK_INIT(&ipf_authlk, "ipf IP User-Auth rwlock");
#if SOLARIS && defined(_KERNEL)
cv_init(&ipf_auth_wait, "ipf auth condvar", CV_DRIVER, NULL);
#endif
#if defined(linux) && defined(_KERNEL)
init_waitqueue_head(&ipf_auth_next_linux);
#endif
ipf_auth_inited = 1;
return 0;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_auth_check */
/* Returns: frentry_t* - pointer to ipf rule if match found, else NULL */
/* Parameters: fin(I) - pointer to ipftoken structure */
/* passp(I) - pointer to ipfgeniter structure */
/* */
/* 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. */
/* ------------------------------------------------------------------------ */
frentry_t *
ipf_auth_check(fin, passp)
fr_info_t *fin;
u_32_t *passp;
{
frentry_t *fr;
frauth_t *fra;
u_32_t pass;
u_short id;
ip_t *ip;
int i;
if (ipf_auth_lock || !ipf_auth_used)
return NULL;
ip = fin->fin_ip;
id = ip->ip_id;
READ_ENTER(&ipf_authlk);
for (i = ipf_auth_start; i != ipf_auth_end; ) {
/*
* 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.
*/
fra = ipf_auth + i;
if ((fra->fra_index == -2) && (id == fra->fra_info.fin_id) &&
!bcmp((char *)fin, (char *)&fra->fra_info, FI_CSIZE)) {
/*
* Avoid feedback loop.
*/
if (!(pass = fra->fra_pass) || (FR_ISAUTH(pass))) {
pass = FR_BLOCK;
fin->fin_reason = 9;
}
/*
* Create a dummy rule for the stateful checking to
* use and return. Zero out any values we don't
* trust from userland!
*/
if ((pass & FR_KEEPSTATE) || ((pass & FR_KEEPFRAG) &&
(fin->fin_flx & FI_FRAG))) {
KMALLOC(fr, frentry_t *);
if (fr) {
bcopy((char *)fra->fra_info.fin_fr,
(char *)fr, sizeof(*fr));
fr->fr_grp = NULL;
fr->fr_ifa = fin->fin_ifp;
fr->fr_func = NULL;
fr->fr_ref = 1;
fr->fr_flags = pass;
fr->fr_ifas[1] = NULL;
fr->fr_ifas[2] = NULL;
fr->fr_ifas[3] = NULL;
}
} else
fr = fra->fra_info.fin_fr;
fin->fin_fr = fr;
RWLOCK_EXIT(&ipf_authlk);
WRITE_ENTER(&ipf_authlk);
/*
* ipf_auth_rules is populated with the rules malloc'd
* above and only those.
*/
if ((fr != NULL) && (fr != fra->fra_info.fin_fr)) {
fr->fr_next = ipf_auth_rules;
ipf_auth_rules = fr;
}
ipf_auth_stats.fas_hits++;
fra->fra_index = -1;
ipf_auth_used--;
if (i == ipf_auth_start) {
while (fra->fra_index == -1) {
i++;
fra++;
if (i == ipf_auth_size) {
i = 0;
fra = ipf_auth;
}
ipf_auth_start = i;
if (i == ipf_auth_end)
break;
}
if (ipf_auth_start == ipf_auth_end) {
ipf_auth_next = 0;
ipf_auth_start = ipf_auth_end = 0;
}
}
RWLOCK_EXIT(&ipf_authlk);
if (passp != NULL)
*passp = pass;
ATOMIC_INC64(ipf_auth_stats.fas_hits);
return fr;
}
i++;
if (i == ipf_auth_size)
i = 0;
}
ipf_auth_stats.fas_miss++;
RWLOCK_EXIT(&ipf_authlk);
ATOMIC_INC64(ipf_auth_stats.fas_miss);
return NULL;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_auth_new */
/* Returns: int - 0 == success, else error */
/* Parameters: m(I) - pointer to mb_t with packet in it */
/* fin(I) - pointer to packet information */
/* */
/* 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
ipf_auth_new(m, fin)
mb_t *m;
fr_info_t *fin;
{
#if defined(_KERNEL) && defined(MENTAT)
qpktinfo_t *qpi = fin->fin_qpi;
#endif
frauth_t *fra;
#if !defined(sparc) && !defined(m68k)
ip_t *ip;
#endif
int i;
if (ipf_auth_lock)
return 0;
WRITE_ENTER(&ipf_authlk);
if (((ipf_auth_end + 1) % ipf_auth_size) == ipf_auth_start) {
ipf_auth_stats.fas_nospace++;
RWLOCK_EXIT(&ipf_authlk);
return 0;
}
ipf_auth_stats.fas_added++;
ipf_auth_used++;
i = ipf_auth_end++;
if (ipf_auth_end == ipf_auth_size)
ipf_auth_end = 0;
RWLOCK_EXIT(&ipf_authlk);
fra = ipf_auth + i;
fra->fra_index = i;
if (fin->fin_fr != NULL)
fra->fra_pass = fin->fin_fr->fr_flags;
else
fra->fra_pass = 0;
fra->fra_age = ipf_auth_defaultage;
bcopy((char *)fin, (char *)&fra->fra_info, sizeof(*fin));
#if !defined(sparc) && !defined(m68k)
/*
* No need to copyback here as we want to undo the changes, not keep
* them.
*/
ip = fin->fin_ip;
# if defined(MENTAT) && defined(_KERNEL)
if ((ip == (ip_t *)m->b_rptr) && (fin->fin_v == 4))
# endif
{
register u_short bo;
bo = ip->ip_len;
ip->ip_len = htons(bo);
bo = ip->ip_off;
ip->ip_off = htons(bo);
}
#endif
#if SOLARIS && defined(_KERNEL)
COPYIFNAME(fin->fin_ifp, fra->fra_info.fin_ifname);
m->b_rptr -= qpi->qpi_off;
ipf_auth_pkts[i] = *(mblk_t **)fin->fin_mp;
fra->fra_q = qpi->qpi_q; /* The queue can disappear! */
fra->fra_m = *fin->fin_mp;
fra->fra_info.fin_mp = &fra->fra_m;
cv_signal(&ipf_auth_wait);
pollwakeup(&ipf_poll_head[IPL_LOGAUTH], POLLIN|POLLRDNORM);
#else
ipf_auth_pkts[i] = m;
WAKEUP(&ipf_auth_next,0);
#endif
return 1;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_auth_ioctl */
/* Returns: int - 0 == success, else error */
/* Parameters: data(IO) - pointer to ioctl data */
/* cmd(I) - ioctl command */
/* mode(I) - mode flags associated with open descriptor */
/* uid(I) - uid associatd with application making the call */
/* ctx(I) - pointer for context */
/* */
/* This function handles all of the ioctls recognised by the auth component */
/* in IPFilter - ie ioctls called on an open fd for /dev/ipf_auth_ip */
/* ------------------------------------------------------------------------ */
int
ipf_auth_ioctl(data, cmd, mode, uid, ctx)
caddr_t data;
ioctlcmd_t cmd;
int mode, uid;
void *ctx;
{
int error = 0, i;
SPL_INT(s);
switch (cmd)
{
case SIOCGENITER :
{
ipftoken_t *token;
ipfgeniter_t iter;
error = ipf_inobj(data, &iter, IPFOBJ_GENITER);
if (error != 0)
break;
SPL_SCHED(s);
token = ipf_findtoken(IPFGENITER_AUTH, uid, ctx);
if (token != NULL)
error = ipf_auth_geniter(token, &iter);
else {
ipf_interror = 10001;
error = ESRCH;
}
RWLOCK_EXIT(&ipf_tokens);
SPL_X(s);
break;
}
case SIOCADAFR :
case SIOCRMAFR :
if (!(mode & FWRITE)) {
ipf_interror = 10002;
error = EPERM;
} else
error = frrequest(IPL_LOGAUTH, cmd, data,
ipf_active, 1);
break;
case SIOCSTLCK :
if (!(mode & FWRITE)) {
ipf_interror = 10003;
error = EPERM;
} else {
error = ipf_lock(data, &ipf_auth_lock);
}
break;
case SIOCATHST:
ipf_auth_stats.fas_faelist = ipf_auth_entries;
error = ipf_outobj(data, &ipf_auth_stats, IPFOBJ_AUTHSTAT);
break;
case SIOCIPFFL:
SPL_NET(s);
WRITE_ENTER(&ipf_authlk);
i = ipf_auth_flush();
RWLOCK_EXIT(&ipf_authlk);
SPL_X(s);
error = BCOPYOUT(&i, data, sizeof(i));
if (error != 0) {
ipf_interror = 10004;
error = EFAULT;
}
break;
case SIOCAUTHW:
error = ipf_auth_wait(data);
break;
case SIOCAUTHR:
error = ipf_auth_reply(data);
break;
default :
ipf_interror = 10005;
error = EINVAL;
break;
}
return error;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_auth_unload */
/* Returns: None */
/* Parameters: None */
/* */
/* Free all network buffer memory used to keep saved packets. */
/* ------------------------------------------------------------------------ */
void
ipf_auth_unload()
{
register int i;
register frauthent_t *fae, **faep;
frentry_t *fr, **frp;
mb_t *m;
if (ipf_auth != NULL) {
KFREES(ipf_auth, ipf_auth_size * sizeof(*ipf_authlk));
ipf_auth = NULL;
}
if (ipf_auth_pkts != NULL) {
for (i = 0; i < ipf_auth_size; i++) {
m = ipf_auth_pkts[i];
if (m != NULL) {
FREE_MB_T(m);
ipf_auth_pkts[i] = NULL;
}
}
KFREES(ipf_auth_pkts, ipf_auth_size * sizeof(*ipf_auth_pkts));
ipf_auth_pkts = NULL;
}
faep = &ipf_auth_entries;
while ((fae = *faep) != NULL) {
*faep = fae->fae_next;
KFREE(fae);
}
ipf_auth_ip = NULL;
if (ipf_auth_rules != NULL) {
for (frp = &ipf_auth_rules; ((fr = *frp) != NULL); ) {
if (fr->fr_ref == 1) {
*frp = fr->fr_next;
KFREE(fr);
} else
frp = &fr->fr_next;
}
}
if (ipf_auth_inited == 1) {
# if SOLARIS && defined(_KERNEL)
cv_destroy(&ipf_auth_wait);
# endif
MUTEX_DESTROY(&ipf_auth_mx);
RW_DESTROY(&ipf_authlk);
ipf_auth_inited = 0;
}
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_auth_expire */
/* Returns: None */
/* Parameters: None */
/* */
/* Slowly expire held auth records. Timeouts are set in expectation of */
/* this being called twice per second. */
/* ------------------------------------------------------------------------ */
void
ipf_auth_expire()
{
frauthent_t *fae, **faep;
frentry_t *fr, **frp;
frauth_t *fra;
mb_t *m;
int i;
SPL_INT(s);
if (ipf_auth_lock)
return;
SPL_NET(s);
WRITE_ENTER(&ipf_authlk);
for (i = 0, fra = ipf_auth; i < ipf_auth_size; i++, fra++) {
fra->fra_age--;
if ((fra->fra_age == 0) && (m = ipf_auth_pkts[i])) {
FREE_MB_T(m);
ipf_auth_pkts[i] = NULL;
ipf_auth[i].fra_index = -1;
ipf_auth_stats.fas_expire++;
ipf_auth_used--;
}
}
/*
* Expire pre-auth rules
*/
for (faep = &ipf_auth_entries; ((fae = *faep) != NULL); ) {
fae->fae_age--;
if (fae->fae_age == 0) {
ipf_auth_deref(&fae);
ipf_auth_stats.fas_expire++;
} else
faep = &fae->fae_next;
}
if (ipf_auth_entries != NULL)
ipf_auth_ip = &ipf_auth_entries->fae_fr;
else
ipf_auth_ip = NULL;
for (frp = &ipf_auth_rules; ((fr = *frp) != NULL); ) {
if (fr->fr_ref == 1) {
*frp = fr->fr_next;
KFREE(fr);
} else
frp = &fr->fr_next;
}
RWLOCK_EXIT(&ipf_authlk);
SPL_X(s);
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_auth_precmd */
/* Returns: int - 0 == success, else error */
/* Parameters: cmd(I) - ioctl command for rule */
/* fr(I) - pointer to ipf rule */
/* fptr(I) - pointer to caller's 'fr' */
/* */
/* ------------------------------------------------------------------------ */
int
ipf_auth_precmd(cmd, fr, frptr)
ioctlcmd_t cmd;
frentry_t *fr, **frptr;
{
frauthent_t *fae, **faep;
int error = 0;
SPL_INT(s);
if ((cmd != SIOCADAFR) && (cmd != SIOCRMAFR)) {
ipf_interror = 10006;
return EIO;
}
for (faep = &ipf_auth_entries; ((fae = *faep) != NULL); ) {
if (&fae->fae_fr == fr)
break;
else
faep = &fae->fae_next;
}
if (cmd == (ioctlcmd_t)SIOCRMAFR) {
if (fr == NULL || frptr == NULL) {
ipf_interror = 10007;
error = EINVAL;
} else if (fae == NULL) {
ipf_interror = 10008;
error = ESRCH;
} else {
SPL_NET(s);
WRITE_ENTER(&ipf_authlk);
*faep = fae->fae_next;
if (ipf_auth_ip == &fae->fae_fr)
ipf_auth_ip = ipf_auth_entries ?
&ipf_auth_entries->fae_fr : NULL;
RWLOCK_EXIT(&ipf_authlk);
SPL_X(s);
KFREE(fae);
}
} else if (fr != NULL && frptr != NULL) {
KMALLOC(fae, frauthent_t *);
if (fae != NULL) {
bcopy((char *)fr, (char *)&fae->fae_fr,
sizeof(*fr));
SPL_NET(s);
WRITE_ENTER(&ipf_authlk);
fae->fae_age = ipf_auth_defaultage;
fae->fae_fr.fr_hits = 0;
fae->fae_fr.fr_next = *frptr;
fae->fae_ref = 1;
*frptr = &fae->fae_fr;
fae->fae_next = *faep;
*faep = fae;
ipf_auth_ip = &ipf_auth_entries->fae_fr;
RWLOCK_EXIT(&ipf_authlk);
SPL_X(s);
} else {
ipf_interror = 10009;
error = ENOMEM;
}
} else {
ipf_interror = 10010;
error = EINVAL;
}
return error;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_auth_flush */
/* Returns: int - number of auth entries flushed */
/* Parameters: None */
/* Locks: WRITE(ipf_authlk) */
/* */
/* This function flushs the ipf_auth_pkts array of any packet data with */
/* references still there. */
/* It is expected that the caller has already acquired the correct locks or */
/* set the priority level correctly for this to block out other code paths */
/* into these data structures. */
/* ------------------------------------------------------------------------ */
int
ipf_auth_flush()
{
register int i, num_flushed;
mb_t *m;
if (ipf_auth_lock)
return -1;
num_flushed = 0;
for (i = 0 ; i < ipf_auth_size; i++) {
m = ipf_auth_pkts[i];
if (m != NULL) {
FREE_MB_T(m);
ipf_auth_pkts[i] = NULL;
ipf_auth[i].fra_index = -1;
/* perhaps add & use a flush counter inst.*/
ipf_auth_stats.fas_expire++;
ipf_auth_used--;
num_flushed++;
}
}
ipf_auth_start = 0;
ipf_auth_end = 0;
ipf_auth_next = 0;
return num_flushed;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_auth_waiting */
/* Returns: int - number of packets in the auth queue */
/* Parameters: None */
/* */
/* Simple truth check to see if there are any packets waiting in the auth */
/* queue. */
/* ------------------------------------------------------------------------ */
int
ipf_auth_waiting()
{
return (ipf_auth_used != 0);
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_auth_geniter */
/* Returns: int - 0 == success, else error */
/* Parameters: token(I) - pointer to ipftoken structure */
/* itp(I) - pointer to ipfgeniter structure */
/* */
/* ------------------------------------------------------------------------ */
int
ipf_auth_geniter(token, itp)
ipftoken_t *token;
ipfgeniter_t *itp;
{
frauthent_t *fae, *next, zero;
int error;
if (itp->igi_data == NULL) {
ipf_interror = 10011;
return EFAULT;
}
if (itp->igi_type != IPFGENITER_AUTH)
ipf_interror = 10012;
return EINVAL;
fae = token->ipt_data;
READ_ENTER(&ipf_authlk);
if (fae == NULL) {
next = ipf_auth_entries;
} else {
next = fae->fae_next;
}
if (next != NULL) {
/*
* If we find an auth entry to use, bump its reference count
* so that it can be used for is_next when we come back.
*/
ATOMIC_INC(next->fae_ref);
if (next->fae_next == NULL) {
ipf_freetoken(token);
token = NULL;
} else {
token->ipt_data = next;
}
} else {
bzero(&zero, sizeof(zero));
next = &zero;
}
RWLOCK_EXIT(&ipf_authlk);
/*
* If we had a prior pointer to an auth entry, release it.
*/
if (fae != NULL) {
WRITE_ENTER(&ipf_authlk);
ipf_auth_deref(&fae);
RWLOCK_EXIT(&ipf_authlk);
}
/*
* This should arguably be via ipf_outobj() so that the auth
* structure can (if required) be massaged going out.
*/
error = COPYOUT(next, itp->igi_data, sizeof(*next));
if (error != 0) {
ipf_interror = 10013;
error = EFAULT;
}
return error;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_auth_deref */
/* Returns: None */
/* Parameters: faep(IO) - pointer to caller's frauthent_t pointer */
/* Locks: WRITE(ipf_authlk) */
/* */
/* This function unconditionally sets the pointer in the caller to NULL, */
/* to make it clear that it should no longer use that pointer, and drops */
/* the reference count on the structure by 1. If it reaches 0, free it up. */
/* ------------------------------------------------------------------------ */
void
ipf_auth_deref(faep)
frauthent_t **faep;
{
frauthent_t *fae;
fae = *faep;
*faep = NULL;
fae->fae_ref--;
if (fae->fae_ref == 0) {
KFREE(fae);
}
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_auth_wait */
/* Returns: int - 0 == success, else error */
/* Parameters: data(I) - pointer to data from ioctl call */
/* */
/* This function is called when an application is waiting for a packet to */
/* match an "auth" rule by issuing an SIOCAUTHW ioctl. If there is already */
/* a packet waiting on the queue then we will return that _one_ immediately.*/
/* If there are no packets present in the queue (ipf_auth_pkts) then we go */
/* to sleep. */
/* ------------------------------------------------------------------------ */
int
ipf_auth_wait(data)
char *data;
{
frauth_t auth, *au = &auth;
int error, len, i;
mb_t *m;
char *t;
SPL_INT(s);
ipf_auth_ioctlloop:
error = ipf_inobj(data, au, IPFOBJ_FRAUTH);
if (error != 0)
return error;
/*
* XXX Locks are held below over calls to copyout...a better
* solution needs to be found so this isn't necessary. The situation
* we are trying to guard against here is an error in the copyout
* steps should not cause the packet to "disappear" from the queue.
*/
READ_ENTER(&ipf_authlk);
/*
* If ipf_auth_next is not equal to ipf_auth_end it will be because
* there is a packet waiting to be delt with in the ipf_auth_pkts
* array. We copy as much of that out to user space as requested.
*/
if (ipf_auth_used > 0) {
while (ipf_auth_pkts[ipf_auth_next] == NULL) {
ipf_auth_next++;
if (ipf_auth_next == ipf_auth_size)
ipf_auth_next = 0;
}
error = ipf_outobj(data, &ipf_auth[ipf_auth_next],
IPFOBJ_FRAUTH);
if (error != 0)
return error;
if (auth.fra_len != 0 && auth.fra_buf != NULL) {
/*
* Copy packet contents out to user space if
* requested. Bail on an error.
*/
m = ipf_auth_pkts[ipf_auth_next];
len = MSGDSIZE(m);
if (len > auth.fra_len)
len = auth.fra_len;
auth.fra_len = len;
for (t = auth.fra_buf; m && (len > 0); ) {
i = MIN(M_LEN(m), len);
error = copyoutptr(MTOD(m, char *), &t, i);
len -= i;
t += i;
if (error != 0)
return error;
m = m->m_next;
}
}
RWLOCK_EXIT(&ipf_authlk);
SPL_NET(s);
WRITE_ENTER(&ipf_authlk);
ipf_auth_next++;
if (ipf_auth_next == ipf_auth_size)
ipf_auth_next = 0;
RWLOCK_EXIT(&ipf_authlk);
SPL_X(s);
return 0;
}
RWLOCK_EXIT(&ipf_authlk);
/*
* We exit ipf_global here because a program that enters in
* here will have a lock on it and goto sleep having this lock.
* If someone were to do an 'ipf -D' the system would then
* deadlock. The catch with releasing it here is that the
* caller of this function expects it to be held when we
* return so we have to reacquire it in here.
*/
RWLOCK_EXIT(&ipf_global);
MUTEX_ENTER(&ipf_auth_mx);
#ifdef _KERNEL
# if SOLARIS
error = 0;
if (!cv_wait_sig(&ipf_auth_wait, &ipf_auth_mx.ipf_lk)) {
ipf_interror = 10014;
error = EINTR;
}
# else /* SOLARIS */
# ifdef __hpux
{
lock_t *l;
l = get_sleep_lock(&ipf_auth_next);
error = sleep(&ipf_auth_next, PZERO+1);
spinunlock(l);
}
# else
# ifdef __osf__
error = mpsleep(&ipf_auth_next, PSUSP|PCATCH, "ipf_auth_next", 0,
&ipf_auth_mx, MS_LOCK_SIMPLE);
# else
error = SLEEP(&ipf_auth_next, "ipf_auth_next");
# endif /* __osf__ */
# endif /* __hpux */
# endif /* SOLARIS */
#endif
MUTEX_EXIT(&ipf_auth_mx);
READ_ENTER(&ipf_global);
if (error == 0)
goto ipf_auth_ioctlloop;
return error;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_auth_reply */
/* Returns: int - 0 == success, else error */
/* Parameters: data(I) - pointer to data from ioctl call */
/* */
/* This function is called by an application when it wants to return a */
/* decision on a packet using the SIOCAUTHR ioctl. This is after it has */
/* received information using an SIOCAUTHW. The decision returned in the */
/* form of flags, the same as those used in each rule. */
/* ------------------------------------------------------------------------ */
int
ipf_auth_reply(data)
char *data;
{
frauth_t auth, *au = &auth, *fra;
int error, i;
mb_t *m;
SPL_INT(s);
error = ipf_inobj(data, &auth, IPFOBJ_FRAUTH);
if (error != 0)
return error;
SPL_NET(s);
WRITE_ENTER(&ipf_authlk);
i = au->fra_index;
fra = ipf_auth + i;
error = 0;
/*
* Check the validity of the information being returned with two simple
* checks. First, the auth index value should be within the size of
* the array and second the packet id being returned should also match.
*/
if ((i < 0) || (i >= ipf_auth_size)) {
RWLOCK_EXIT(&ipf_authlk);
SPL_X(s);
ipf_interror = 10015;
return ESRCH;
}
if (fra->fra_info.fin_id != au->fra_info.fin_id) {
RWLOCK_EXIT(&ipf_authlk);
SPL_X(s);
ipf_interror = 10019;
return ESRCH;
}
m = ipf_auth_pkts[i];
fra->fra_index = -2;
fra->fra_pass = au->fra_pass;
ipf_auth_pkts[i] = NULL;
RWLOCK_EXIT(&ipf_authlk);
/*
* Re-insert the packet back into the packet stream flowing through
* the kernel in a manner that will mean IPFilter sees the packet
* again. This is not the same as is done with fastroute,
* deliberately, as we want to resume the normal packet processing
* path for it.
*/
#ifdef _KERNEL
if ((m != NULL) && (au->fra_info.fin_out != 0)) {
error = ipf_inject(&fra->fra_info, m);
if (error != 0) {
ipf_interror = 10016;
error = ENOBUFS;
ipf_auth_stats.fas_sendfail++;
} else {
ipf_auth_stats.fas_sendok++;
}
} else if (m) {
error = ipf_inject(&fra->fra_info, m);
if (error != 0) {
ipf_interror = 10017;
error = ENOBUFS;
ipf_auth_stats.fas_quefail++;
} else {
ipf_auth_stats.fas_queok++;
}
} else {
ipf_interror = 10018;
error = EINVAL;
}
/*
* 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) {
ipf_auth_used--;
fra->fra_index = -1;
fra->fra_pass = 0;
if (i == ipf_auth_start) {
while (fra->fra_index == -1) {
i++;
if (i == ipf_auth_size)
i = 0;
ipf_auth_start = i;
if (i == ipf_auth_end)
break;
}
if (ipf_auth_start == ipf_auth_end) {
ipf_auth_next = 0;
ipf_auth_start = ipf_auth_end = 0;
}
}
}
#endif /* _KERNEL */
SPL_X(s);
return 0;
}