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f-stack/freebsd/contrib/ipfilter/netinet/ip_auth.c

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/* $FreeBSD$ */
/*
* Copyright (C) 2012 by Darren Reed.
*
* 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>
# ifdef _STDC_C99
# include <stdbool.h>
# endif
# 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 (defined(_BSDI_VERSION) && (_BSDI_VERSION >= 199802)) || \
(defined(__FreeBSD_version) &&(__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
#if defined(__NetBSD_Version__) && (__NetBSD_Version__ >= 400000) && \
!defined(_KERNEL)
# include <stdbool.h>
#endif
#include <net/if.h>
#ifdef sun
# include <net/af.h>
#endif
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#if !defined(linux)
# include <netinet/ip_var.h>
#endif
#if !defined(_KERNEL) && !defined(__osf__) && !defined(__sgi)
# define KERNEL
# define _KERNEL
# define NOT_KERNEL
#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[] = "@(#)$FreeBSD$";
/* static const char rcsid[] = "@(#)$Id: ip_auth.c,v 2.73.2.24 2007/09/09 11:32:04 darrenr Exp $"; */
#endif
static void ipf_auth_deref __P((frauthent_t **));
static void ipf_auth_deref_unlocked __P((ipf_auth_softc_t *, frauthent_t **));
static int ipf_auth_geniter __P((ipf_main_softc_t *, ipftoken_t *,
ipfgeniter_t *, ipfobj_t *));
static int ipf_auth_reply __P((ipf_main_softc_t *, ipf_auth_softc_t *, char *));
static int ipf_auth_wait __P((ipf_main_softc_t *, ipf_auth_softc_t *, char *));
static int ipf_auth_flush __P((void *));
/* ------------------------------------------------------------------------ */
/* Function: ipf_auth_main_load */
/* Returns: int - 0 == success, else error */
/* Parameters: None */
/* */
/* A null-op function that exists as a placeholder so that the flow in */
/* other functions is obvious. */
/* ------------------------------------------------------------------------ */
int
ipf_auth_main_load()
{
return 0;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_auth_main_unload */
/* Returns: int - 0 == success, else error */
/* Parameters: None */
/* */
/* A null-op function that exists as a placeholder so that the flow in */
/* other functions is obvious. */
/* ------------------------------------------------------------------------ */
int
ipf_auth_main_unload()
{
return 0;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_auth_soft_create */
/* Returns: int - NULL = failure, else success */
/* Parameters: softc(I) - pointer to soft context data */
/* */
/* Create a structre to store all of the run-time data for packet auth in */
/* and initialise some fields to their defaults. */
/* ------------------------------------------------------------------------ */
void *
ipf_auth_soft_create(softc)
ipf_main_softc_t *softc;
{
ipf_auth_softc_t *softa;
KMALLOC(softa, ipf_auth_softc_t *);
if (softa == NULL)
return NULL;
bzero((char *)softa, sizeof(*softa));
softa->ipf_auth_size = FR_NUMAUTH;
softa->ipf_auth_defaultage = 600;
RWLOCK_INIT(&softa->ipf_authlk, "ipf IP User-Auth rwlock");
MUTEX_INIT(&softa->ipf_auth_mx, "ipf auth log mutex");
#if SOLARIS && defined(_KERNEL)
cv_init(&softa->ipf_auth_wait, "ipf auth condvar", CV_DRIVER, NULL);
#endif
return softa;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_auth_soft_init */
/* Returns: int - 0 == success, else error */
/* Parameters: softc(I) - pointer to soft context data */
/* arg(I) - opaque pointer to auth context data */
/* */
/* Allocate memory and initialise data structures used in handling auth */
/* rules. */
/* ------------------------------------------------------------------------ */
int
ipf_auth_soft_init(softc, arg)
ipf_main_softc_t *softc;
void *arg;
{
ipf_auth_softc_t *softa = arg;
KMALLOCS(softa->ipf_auth, frauth_t *,
softa->ipf_auth_size * sizeof(*softa->ipf_auth));
if (softa->ipf_auth == NULL)
return -1;
bzero((char *)softa->ipf_auth,
softa->ipf_auth_size * sizeof(*softa->ipf_auth));
KMALLOCS(softa->ipf_auth_pkts, mb_t **,
softa->ipf_auth_size * sizeof(*softa->ipf_auth_pkts));
if (softa->ipf_auth_pkts == NULL)
return -2;
bzero((char *)softa->ipf_auth_pkts,
softa->ipf_auth_size * sizeof(*softa->ipf_auth_pkts));
#if defined(linux) && defined(_KERNEL)
init_waitqueue_head(&softa->ipf_auth_next_linux);
#endif
return 0;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_auth_soft_fini */
/* Returns: int - 0 == success, else error */
/* Parameters: softc(I) - pointer to soft context data */
/* arg(I) - opaque pointer to auth context data */
/* */
/* Free all network buffer memory used to keep saved packets that have been */
/* connectedd to the soft soft context structure *but* do not free that: it */
/* is free'd by _destroy(). */
/* ------------------------------------------------------------------------ */
int
ipf_auth_soft_fini(softc, arg)
ipf_main_softc_t *softc;
void *arg;
{
ipf_auth_softc_t *softa = arg;
frauthent_t *fae, **faep;
frentry_t *fr, **frp;
mb_t *m;
int i;
if (softa->ipf_auth != NULL) {
KFREES(softa->ipf_auth,
softa->ipf_auth_size * sizeof(*softa->ipf_auth));
softa->ipf_auth = NULL;
}
if (softa->ipf_auth_pkts != NULL) {
for (i = 0; i < softa->ipf_auth_size; i++) {
m = softa->ipf_auth_pkts[i];
if (m != NULL) {
FREE_MB_T(m);
softa->ipf_auth_pkts[i] = NULL;
}
}
KFREES(softa->ipf_auth_pkts,
softa->ipf_auth_size * sizeof(*softa->ipf_auth_pkts));
softa->ipf_auth_pkts = NULL;
}
faep = &softa->ipf_auth_entries;
while ((fae = *faep) != NULL) {
*faep = fae->fae_next;
KFREE(fae);
}
softa->ipf_auth_ip = NULL;
if (softa->ipf_auth_rules != NULL) {
for (frp = &softa->ipf_auth_rules; ((fr = *frp) != NULL); ) {
if (fr->fr_ref == 1) {
*frp = fr->fr_next;
MUTEX_DESTROY(&fr->fr_lock);
KFREE(fr);
} else
frp = &fr->fr_next;
}
}
return 0;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_auth_soft_destroy */
/* Returns: void */
/* Parameters: softc(I) - pointer to soft context data */
/* arg(I) - opaque pointer to auth context data */
/* */
/* Undo what was done in _create() - i.e. free the soft context data. */
/* ------------------------------------------------------------------------ */
void
ipf_auth_soft_destroy(softc, arg)
ipf_main_softc_t *softc;
void *arg;
{
ipf_auth_softc_t *softa = arg;
# if SOLARIS && defined(_KERNEL)
cv_destroy(&softa->ipf_auth_wait);
# endif
MUTEX_DESTROY(&softa->ipf_auth_mx);
RW_DESTROY(&softa->ipf_authlk);
KFREE(softa);
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_auth_setlock */
/* Returns: void */
/* Paramters: arg(I) - pointer to soft context data */
/* tmp(I) - value to assign to auth lock */
/* */
/* ------------------------------------------------------------------------ */
void
ipf_auth_setlock(arg, tmp)
void *arg;
int tmp;
{
ipf_auth_softc_t *softa = arg;
softa->ipf_auth_lock = tmp;
}
/* ------------------------------------------------------------------------ */
/* 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;
{
ipf_main_softc_t *softc = fin->fin_main_soft;
ipf_auth_softc_t *softa = softc->ipf_auth_soft;
frentry_t *fr;
frauth_t *fra;
u_32_t pass;
u_short id;
ip_t *ip;
int i;
if (softa->ipf_auth_lock || !softa->ipf_auth_used)
return NULL;
ip = fin->fin_ip;
id = ip->ip_id;
READ_ENTER(&softa->ipf_authlk);
for (i = softa->ipf_auth_start; i != softa->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 = softa->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 = FRB_AUTHFEEDBACK;
}
/*
* 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;
MUTEX_INIT(&fr->fr_lock,
"ipf auth rule");
}
} else
fr = fra->fra_info.fin_fr;
fin->fin_fr = fr;
fin->fin_flx |= fra->fra_flx;
RWLOCK_EXIT(&softa->ipf_authlk);
WRITE_ENTER(&softa->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 = softa->ipf_auth_rules;
softa->ipf_auth_rules = fr;
}
softa->ipf_auth_stats.fas_hits++;
fra->fra_index = -1;
softa->ipf_auth_used--;
softa->ipf_auth_replies--;
if (i == softa->ipf_auth_start) {
while (fra->fra_index == -1) {
i++;
fra++;
if (i == softa->ipf_auth_size) {
i = 0;
fra = softa->ipf_auth;
}
softa->ipf_auth_start = i;
if (i == softa->ipf_auth_end)
break;
}
if (softa->ipf_auth_start ==
softa->ipf_auth_end) {
softa->ipf_auth_next = 0;
softa->ipf_auth_start = 0;
softa->ipf_auth_end = 0;
}
}
RWLOCK_EXIT(&softa->ipf_authlk);
if (passp != NULL)
*passp = pass;
softa->ipf_auth_stats.fas_hits++;
return fr;
}
i++;
if (i == softa->ipf_auth_size)
i = 0;
}
RWLOCK_EXIT(&softa->ipf_authlk);
softa->ipf_auth_stats.fas_miss++;
return NULL;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_auth_new */
/* Returns: int - 1 == success, 0 = did not put packet on auth queue */
/* 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;
{
ipf_main_softc_t *softc = fin->fin_main_soft;
ipf_auth_softc_t *softa = softc->ipf_auth_soft;
#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 (softa->ipf_auth_lock)
return 0;
WRITE_ENTER(&softa->ipf_authlk);
if (((softa->ipf_auth_end + 1) % softa->ipf_auth_size) ==
softa->ipf_auth_start) {
softa->ipf_auth_stats.fas_nospace++;
RWLOCK_EXIT(&softa->ipf_authlk);
return 0;
}
softa->ipf_auth_stats.fas_added++;
softa->ipf_auth_used++;
i = softa->ipf_auth_end++;
if (softa->ipf_auth_end == softa->ipf_auth_size)
softa->ipf_auth_end = 0;
fra = softa->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 = softa->ipf_auth_defaultage;
bcopy((char *)fin, (char *)&fra->fra_info, sizeof(*fin));
fra->fra_flx = fra->fra_info.fin_flx & (FI_STATE|FI_NATED);
fra->fra_info.fin_flx &= ~(FI_STATE|FI_NATED);
#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_v, fin->fin_ifp, fra->fra_info.fin_ifname);
m->b_rptr -= qpi->qpi_off;
fra->fra_q = qpi->qpi_q; /* The queue can disappear! */
fra->fra_m = *fin->fin_mp;
fra->fra_info.fin_mp = &fra->fra_m;
softa->ipf_auth_pkts[i] = *(mblk_t **)fin->fin_mp;
RWLOCK_EXIT(&softa->ipf_authlk);
cv_signal(&softa->ipf_auth_wait);
pollwakeup(&softc->ipf_poll_head[IPL_LOGAUTH], POLLIN|POLLRDNORM);
#else
softa->ipf_auth_pkts[i] = m;
RWLOCK_EXIT(&softa->ipf_authlk);
WAKEUP(&softa->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 */
/* ------------------------------------------------------------------------ */
int
ipf_auth_ioctl(softc, data, cmd, mode, uid, ctx)
ipf_main_softc_t *softc;
caddr_t data;
ioctlcmd_t cmd;
int mode, uid;
void *ctx;
{
ipf_auth_softc_t *softa = softc->ipf_auth_soft;
int error = 0, i;
SPL_INT(s);
switch (cmd)
{
case SIOCGENITER :
{
ipftoken_t *token;
ipfgeniter_t iter;
ipfobj_t obj;
error = ipf_inobj(softc, data, &obj, &iter, IPFOBJ_GENITER);
if (error != 0)
break;
SPL_SCHED(s);
token = ipf_token_find(softc, IPFGENITER_AUTH, uid, ctx);
if (token != NULL)
error = ipf_auth_geniter(softc, token, &iter, &obj);
else {
WRITE_ENTER(&softc->ipf_tokens);
ipf_token_deref(softc, token);
RWLOCK_EXIT(&softc->ipf_tokens);
IPFERROR(10001);
error = ESRCH;
}
SPL_X(s);
break;
}
case SIOCADAFR :
case SIOCRMAFR :
if (!(mode & FWRITE)) {
IPFERROR(10002);
error = EPERM;
} else
error = frrequest(softc, IPL_LOGAUTH, cmd, data,
softc->ipf_active, 1);
break;
case SIOCSTLCK :
if (!(mode & FWRITE)) {
IPFERROR(10003);
error = EPERM;
} else {
error = ipf_lock(data, &softa->ipf_auth_lock);
}
break;
case SIOCATHST:
softa->ipf_auth_stats.fas_faelist = softa->ipf_auth_entries;
error = ipf_outobj(softc, data, &softa->ipf_auth_stats,
IPFOBJ_AUTHSTAT);
break;
case SIOCIPFFL:
SPL_NET(s);
WRITE_ENTER(&softa->ipf_authlk);
i = ipf_auth_flush(softa);
RWLOCK_EXIT(&softa->ipf_authlk);
SPL_X(s);
error = BCOPYOUT(&i, data, sizeof(i));
if (error != 0) {
IPFERROR(10004);
error = EFAULT;
}
break;
case SIOCAUTHW:
error = ipf_auth_wait(softc, softa, data);
break;
case SIOCAUTHR:
error = ipf_auth_reply(softc, softa, data);
break;
default :
IPFERROR(10005);
error = EINVAL;
break;
}
return error;
}
/* ------------------------------------------------------------------------ */
/* 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(softc)
ipf_main_softc_t *softc;
{
ipf_auth_softc_t *softa = softc->ipf_auth_soft;
frauthent_t *fae, **faep;
frentry_t *fr, **frp;
frauth_t *fra;
mb_t *m;
int i;
SPL_INT(s);
if (softa->ipf_auth_lock)
return;
SPL_NET(s);
WRITE_ENTER(&softa->ipf_authlk);
for (i = 0, fra = softa->ipf_auth; i < softa->ipf_auth_size;
i++, fra++) {
fra->fra_age--;
if ((fra->fra_age == 0) &&
(softa->ipf_auth[i].fra_index != -1)) {
if ((m = softa->ipf_auth_pkts[i]) != NULL) {
FREE_MB_T(m);
softa->ipf_auth_pkts[i] = NULL;
} else if (softa->ipf_auth[i].fra_index == -2) {
softa->ipf_auth_replies--;
}
softa->ipf_auth[i].fra_index = -1;
softa->ipf_auth_stats.fas_expire++;
softa->ipf_auth_used--;
}
}
/*
* Expire pre-auth rules
*/
for (faep = &softa->ipf_auth_entries; ((fae = *faep) != NULL); ) {
fae->fae_age--;
if (fae->fae_age == 0) {
ipf_auth_deref(&fae);
softa->ipf_auth_stats.fas_expire++;
} else
faep = &fae->fae_next;
}
if (softa->ipf_auth_entries != NULL)
softa->ipf_auth_ip = &softa->ipf_auth_entries->fae_fr;
else
softa->ipf_auth_ip = NULL;
for (frp = &softa->ipf_auth_rules; ((fr = *frp) != NULL); ) {
if (fr->fr_ref == 1) {
*frp = fr->fr_next;
MUTEX_DESTROY(&fr->fr_lock);
KFREE(fr);
} else
frp = &fr->fr_next;
}
RWLOCK_EXIT(&softa->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(softc, cmd, fr, frptr)
ipf_main_softc_t *softc;
ioctlcmd_t cmd;
frentry_t *fr, **frptr;
{
ipf_auth_softc_t *softa = softc->ipf_auth_soft;
frauthent_t *fae, **faep;
int error = 0;
SPL_INT(s);
if ((cmd != SIOCADAFR) && (cmd != SIOCRMAFR)) {
IPFERROR(10006);
return EIO;
}
for (faep = &softa->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) {
IPFERROR(10007);
error = EINVAL;
} else if (fae == NULL) {
IPFERROR(10008);
error = ESRCH;
} else {
SPL_NET(s);
WRITE_ENTER(&softa->ipf_authlk);
*faep = fae->fae_next;
if (softa->ipf_auth_ip == &fae->fae_fr)
softa->ipf_auth_ip = softa->ipf_auth_entries ?
&softa->ipf_auth_entries->fae_fr : NULL;
RWLOCK_EXIT(&softa->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(&softa->ipf_authlk);
fae->fae_age = softa->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;
softa->ipf_auth_ip = &softa->ipf_auth_entries->fae_fr;
RWLOCK_EXIT(&softa->ipf_authlk);
SPL_X(s);
} else {
IPFERROR(10009);
error = ENOMEM;
}
} else {
IPFERROR(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. */
/* ------------------------------------------------------------------------ */
static int
ipf_auth_flush(arg)
void *arg;
{
ipf_auth_softc_t *softa = arg;
int i, num_flushed;
mb_t *m;
if (softa->ipf_auth_lock)
return -1;
num_flushed = 0;
for (i = 0 ; i < softa->ipf_auth_size; i++) {
if (softa->ipf_auth[i].fra_index != -1) {
m = softa->ipf_auth_pkts[i];
if (m != NULL) {
FREE_MB_T(m);
softa->ipf_auth_pkts[i] = NULL;
}
softa->ipf_auth[i].fra_index = -1;
/* perhaps add & use a flush counter inst.*/
softa->ipf_auth_stats.fas_expire++;
num_flushed++;
}
}
softa->ipf_auth_start = 0;
softa->ipf_auth_end = 0;
softa->ipf_auth_next = 0;
softa->ipf_auth_used = 0;
softa->ipf_auth_replies = 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(softc)
ipf_main_softc_t *softc;
{
ipf_auth_softc_t *softa = softc->ipf_auth_soft;
return (softa->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 */
/* objp(I) - pointer to ipf object destription */
/* */
/* Iterate through the list of entries in the auth queue list. */
/* objp is used here to get the location of where to do the copy out to. */
/* Stomping over various fields with new information will not harm anything */
/* ------------------------------------------------------------------------ */
static int
ipf_auth_geniter(softc, token, itp, objp)
ipf_main_softc_t *softc;
ipftoken_t *token;
ipfgeniter_t *itp;
ipfobj_t *objp;
{
ipf_auth_softc_t *softa = softc->ipf_auth_soft;
frauthent_t *fae, *next, zero;
int error;
if (itp->igi_data == NULL) {
IPFERROR(10011);
return EFAULT;
}
if (itp->igi_type != IPFGENITER_AUTH) {
IPFERROR(10012);
return EINVAL;
}
objp->ipfo_type = IPFOBJ_FRAUTH;
objp->ipfo_ptr = itp->igi_data;
objp->ipfo_size = sizeof(frauth_t);
READ_ENTER(&softa->ipf_authlk);
fae = token->ipt_data;
if (fae == NULL) {
next = softa->ipf_auth_entries;
} else {
next = fae->fae_next;
}
/*
* If we found an auth entry to use, bump its reference count
* so that it can be used for is_next when we come back.
*/
if (next != NULL) {
ATOMIC_INC(next->fae_ref);
token->ipt_data = next;
} else {
bzero(&zero, sizeof(zero));
next = &zero;
token->ipt_data = NULL;
}
RWLOCK_EXIT(&softa->ipf_authlk);
error = ipf_outobjk(softc, objp, next);
if (fae != NULL)
ipf_auth_deref_unlocked(softa, &fae);
if (next->fae_next == NULL)
ipf_token_mark_complete(token);
return error;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_auth_deref_unlocked */
/* Returns: None */
/* Parameters: faep(IO) - pointer to caller's frauthent_t pointer */
/* */
/* Wrapper for ipf_auth_deref for when a write lock on ipf_authlk is not */
/* held. */
/* ------------------------------------------------------------------------ */
static void
ipf_auth_deref_unlocked(softa, faep)
ipf_auth_softc_t *softa;
frauthent_t **faep;
{
WRITE_ENTER(&softa->ipf_authlk);
ipf_auth_deref(faep);
RWLOCK_EXIT(&softa->ipf_authlk);
}
/* ------------------------------------------------------------------------ */
/* 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. */
/* ------------------------------------------------------------------------ */
static 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_pkt */
/* 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. */
/* ------------------------------------------------------------------------ */
static int
ipf_auth_wait(softc, softa, data)
ipf_main_softc_t *softc;
ipf_auth_softc_t *softa;
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(softc, data, NULL, 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.
*/
SPL_NET(s);
READ_ENTER(&softa->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 (softa->ipf_auth_used > 0) {
while (softa->ipf_auth_pkts[softa->ipf_auth_next] == NULL) {
softa->ipf_auth_next++;
if (softa->ipf_auth_next == softa->ipf_auth_size)
softa->ipf_auth_next = 0;
}
error = ipf_outobj(softc, data,
&softa->ipf_auth[softa->ipf_auth_next],
IPFOBJ_FRAUTH);
if (error != 0) {
RWLOCK_EXIT(&softa->ipf_authlk);
SPL_X(s);
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 = softa->ipf_auth_pkts[softa->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(softc, MTOD(m, char *),
&t, i);
len -= i;
t += i;
if (error != 0) {
RWLOCK_EXIT(&softa->ipf_authlk);
SPL_X(s);
return error;
}
m = m->m_next;
}
}
RWLOCK_EXIT(&softa->ipf_authlk);
SPL_NET(s);
WRITE_ENTER(&softa->ipf_authlk);
softa->ipf_auth_next++;
if (softa->ipf_auth_next == softa->ipf_auth_size)
softa->ipf_auth_next = 0;
RWLOCK_EXIT(&softa->ipf_authlk);
SPL_X(s);
return 0;
}
RWLOCK_EXIT(&softa->ipf_authlk);
SPL_X(s);
MUTEX_ENTER(&softa->ipf_auth_mx);
#ifdef _KERNEL
# if SOLARIS
error = 0;
if (!cv_wait_sig(&softa->ipf_auth_wait, &softa->ipf_auth_mx.ipf_lk)) {
IPFERROR(10014);
error = EINTR;
}
# else /* SOLARIS */
# ifdef __hpux
{
lock_t *l;
l = get_sleep_lock(&softa->ipf_auth_next);
error = sleep(&softa->ipf_auth_next, PZERO+1);
spinunlock(l);
}
# else
# ifdef __osf__
error = mpsleep(&softa->ipf_auth_next, PSUSP|PCATCH, "ipf_auth_next",
0, &softa->ipf_auth_mx, MS_LOCK_SIMPLE);
# else
error = SLEEP(&softa->ipf_auth_next, "ipf_auth_next");
# endif /* __osf__ */
# endif /* __hpux */
# endif /* SOLARIS */
#endif
MUTEX_EXIT(&softa->ipf_auth_mx);
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. */
/* ------------------------------------------------------------------------ */
static int
ipf_auth_reply(softc, softa, data)
ipf_main_softc_t *softc;
ipf_auth_softc_t *softa;
char *data;
{
frauth_t auth, *au = &auth, *fra;
fr_info_t fin;
int error, i;
mb_t *m;
SPL_INT(s);
error = ipf_inobj(softc, data, NULL, &auth, IPFOBJ_FRAUTH);
if (error != 0)
return error;
SPL_NET(s);
WRITE_ENTER(&softa->ipf_authlk);
i = au->fra_index;
fra = softa->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 >= softa->ipf_auth_size)) {
RWLOCK_EXIT(&softa->ipf_authlk);
SPL_X(s);
IPFERROR(10015);
return ESRCH;
}
if (fra->fra_info.fin_id != au->fra_info.fin_id) {
RWLOCK_EXIT(&softa->ipf_authlk);
SPL_X(s);
IPFERROR(10019);
return ESRCH;
}
m = softa->ipf_auth_pkts[i];
fra->fra_index = -2;
fra->fra_pass = au->fra_pass;
softa->ipf_auth_pkts[i] = NULL;
softa->ipf_auth_replies++;
bcopy(&fra->fra_info, &fin, sizeof(fin));
RWLOCK_EXIT(&softa->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(&fin, m);
if (error != 0) {
IPFERROR(10016);
error = ENOBUFS;
softa->ipf_auth_stats.fas_sendfail++;
} else {
softa->ipf_auth_stats.fas_sendok++;
}
} else if (m) {
error = ipf_inject(&fin, m);
if (error != 0) {
IPFERROR(10017);
error = ENOBUFS;
softa->ipf_auth_stats.fas_quefail++;
} else {
softa->ipf_auth_stats.fas_queok++;
}
} else {
IPFERROR(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) {
WRITE_ENTER(&softa->ipf_authlk);
softa->ipf_auth_used--;
fra->fra_index = -1;
fra->fra_pass = 0;
if (i == softa->ipf_auth_start) {
while (fra->fra_index == -1) {
i++;
if (i == softa->ipf_auth_size)
i = 0;
softa->ipf_auth_start = i;
if (i == softa->ipf_auth_end)
break;
}
if (softa->ipf_auth_start == softa->ipf_auth_end) {
softa->ipf_auth_next = 0;
softa->ipf_auth_start = 0;
softa->ipf_auth_end = 0;
}
}
RWLOCK_EXIT(&softa->ipf_authlk);
}
#endif /* _KERNEL */
SPL_X(s);
return 0;
}
u_32_t
ipf_auth_pre_scanlist(softc, fin, pass)
ipf_main_softc_t *softc;
fr_info_t *fin;
u_32_t pass;
{
ipf_auth_softc_t *softa = softc->ipf_auth_soft;
if (softa->ipf_auth_ip != NULL)
return ipf_scanlist(fin, softc->ipf_pass);
return pass;
}
frentry_t **
ipf_auth_rulehead(softc)
ipf_main_softc_t *softc;
{
ipf_auth_softc_t *softa = softc->ipf_auth_soft;
return &softa->ipf_auth_ip;
}
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