source-ipfw.c

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/* Copyright (C) 2007-2014 Open Information Security Foundation
 *
 * You can copy, redistribute or modify this Program under the terms of
 * the GNU General Public License version 2 as published by the Free
 * Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * version 2 along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */
 
/**
 * \file
 *
 * \author Nick Rogness <nick@rogness.net>
 * \author Eric Leblond <eric@regit.org>
 *
 * IPFW packet acquisition support
 */
 
#include "suricata-common.h"
#include "suricata.h"
#include "decode.h"
#include "packet.h"
#include "packet-queue.h"
#include "threads.h"
#include "threadvars.h"
#include "tm-queuehandlers.h"
#include "tm-threads.h"
#include "source-ipfw.h"
#include "util-debug.h"
#include "conf.h"
#include "util-byte.h"
#include "util-privs.h"
#include "util-datalink.h"
#include "util-device-private.h"
#include "runmodes.h"
 
#ifndef IPFW
/* Handle the case if --enable-ipfw was not used
 *
 */
 
TmEcode NoIPFWSupportExit(ThreadVars *, const void *, void **);
 
void TmModuleReceiveIPFWRegister (void)
{
 
    tmm_modules[TMM_RECEIVEIPFW].name = "ReceiveIPFW";
    tmm_modules[TMM_RECEIVEIPFW].ThreadInit = NoIPFWSupportExit;
    tmm_modules[TMM_RECEIVEIPFW].Func = NULL;
    tmm_modules[TMM_RECEIVEIPFW].ThreadExitPrintStats = NULL;
    tmm_modules[TMM_RECEIVEIPFW].ThreadDeinit = NULL;
    tmm_modules[TMM_RECEIVEIPFW].flags = TM_FLAG_RECEIVE_TM;
}
 
void TmModuleVerdictIPFWRegister (void)
{
    tmm_modules[TMM_VERDICTIPFW].name = "VerdictIPFW";
    tmm_modules[TMM_VERDICTIPFW].ThreadInit = NoIPFWSupportExit;
    tmm_modules[TMM_VERDICTIPFW].Func = NULL;
    tmm_modules[TMM_VERDICTIPFW].ThreadExitPrintStats = NULL;
    tmm_modules[TMM_VERDICTIPFW].ThreadDeinit = NULL;
    tmm_modules[TMM_VERDICTIPFW].flags = TM_FLAG_VERDICT_TM;
}
 
void TmModuleDecodeIPFWRegister (void)
{
    tmm_modules[TMM_DECODEIPFW].name = "DecodeIPFW";
    tmm_modules[TMM_DECODEIPFW].ThreadInit = NoIPFWSupportExit;
    tmm_modules[TMM_DECODEIPFW].Func = NULL;
    tmm_modules[TMM_DECODEIPFW].ThreadExitPrintStats = NULL;
    tmm_modules[TMM_DECODEIPFW].ThreadDeinit = NULL;
    tmm_modules[TMM_DECODEIPFW].cap_flags = 0;
    tmm_modules[TMM_DECODEIPFW].flags = TM_FLAG_DECODE_TM;
}
 
TmEcode NoIPFWSupportExit(ThreadVars *tv, const void *initdata, void **data)
{
 
    SCLogError("Error creating thread %s: you do not have support for ipfw "
               "enabled please recompile with --enable-ipfw",
            tv->name);
    exit(EXIT_FAILURE);
}
 
#else /* We have IPFW compiled in */
 
#include "action-globals.h"
 
#define IPFW_ACCEPT 0
#define IPFW_DROP   1
 
#define IPFW_SOCKET_POLL_MSEC 300
 
extern uint32_t max_pending_packets;
 
/**
 * \brief Structure to hold thread specific variables.
 */
typedef struct IPFWThreadVars_
{
    /* data link type for the thread, probably not needed */
    int datalink;
 
    /* this one should be not changing after init */
    uint16_t port_num;
    /* position into the NFQ queue var array */
    uint16_t ipfw_index;
 
    /* counters */
    uint32_t pkts;
    uint64_t bytes;
    uint32_t errs;
    uint32_t accepted;
    uint32_t dropped;
} IPFWThreadVars;
 
static IPFWThreadVars ipfw_t[IPFW_MAX_QUEUE];
static IPFWQueueVars ipfw_q[IPFW_MAX_QUEUE];
static uint16_t receive_port_num = 0;
static SCMutex ipfw_init_lock;
 
/* IPFW Prototypes */
static void *IPFWGetQueue(int number);
static TmEcode ReceiveIPFWThreadInit(ThreadVars *, const void *, void **);
static TmEcode ReceiveIPFWLoop(ThreadVars *tv, void *data, void *slot);
static void ReceiveIPFWThreadExitStats(ThreadVars *, void *);
static TmEcode ReceiveIPFWThreadDeinit(ThreadVars *, void *);
 
static TmEcode IPFWSetVerdict(ThreadVars *, IPFWThreadVars *, Packet *);
static TmEcode VerdictIPFW(ThreadVars *, Packet *, void *);
static TmEcode VerdictIPFWThreadInit(ThreadVars *, const void *, void **);
static void VerdictIPFWThreadExitStats(ThreadVars *, void *);
static TmEcode VerdictIPFWThreadDeinit(ThreadVars *, void *);
 
static TmEcode DecodeIPFWThreadInit(ThreadVars *, const void *, void **);
static TmEcode DecodeIPFWThreadDeinit(ThreadVars *tv, void *data);
static TmEcode DecodeIPFW(ThreadVars *, Packet *, void *);
 
/**
 * \brief Registration Function for RecieveIPFW.
 * \todo Unit tests are needed for this module.
 */
void TmModuleReceiveIPFWRegister (void)
{
    SCMutexInit(&ipfw_init_lock, NULL);
 
    tmm_modules[TMM_RECEIVEIPFW].name = "ReceiveIPFW";
    tmm_modules[TMM_RECEIVEIPFW].ThreadInit = ReceiveIPFWThreadInit;
    tmm_modules[TMM_RECEIVEIPFW].Func = NULL;
    tmm_modules[TMM_RECEIVEIPFW].PktAcqLoop = ReceiveIPFWLoop;
    tmm_modules[TMM_RECEIVEIPFW].PktAcqBreakLoop = NULL;
    tmm_modules[TMM_RECEIVEIPFW].ThreadExitPrintStats = ReceiveIPFWThreadExitStats;
    tmm_modules[TMM_RECEIVEIPFW].ThreadDeinit = ReceiveIPFWThreadDeinit;
    tmm_modules[TMM_RECEIVEIPFW].cap_flags = SC_CAP_NET_ADMIN | SC_CAP_NET_RAW |
                                             SC_CAP_NET_BIND_SERVICE |
                                             SC_CAP_NET_BROADCAST; /** \todo untested */
    tmm_modules[TMM_RECEIVEIPFW].flags = TM_FLAG_RECEIVE_TM;
}
 
/**
 * \brief Registration Function for VerdictIPFW.
 * \todo Unit tests are needed for this module.
 */
void TmModuleVerdictIPFWRegister (void)
{
    tmm_modules[TMM_VERDICTIPFW].name = "VerdictIPFW";
    tmm_modules[TMM_VERDICTIPFW].ThreadInit = VerdictIPFWThreadInit;
    tmm_modules[TMM_VERDICTIPFW].Func = VerdictIPFW;
    tmm_modules[TMM_VERDICTIPFW].ThreadExitPrintStats = VerdictIPFWThreadExitStats;
    tmm_modules[TMM_VERDICTIPFW].ThreadDeinit = VerdictIPFWThreadDeinit;
    tmm_modules[TMM_VERDICTIPFW].cap_flags = SC_CAP_NET_ADMIN | SC_CAP_NET_RAW |
                                             SC_CAP_NET_BIND_SERVICE; /** \todo untested */
    tmm_modules[TMM_VERDICTIPFW].flags = TM_FLAG_VERDICT_TM;
}
 
/**
 * \brief Registration Function for DecodeIPFW.
 * \todo Unit tests are needed for this module.
 */
void TmModuleDecodeIPFWRegister (void)
{
    tmm_modules[TMM_DECODEIPFW].name = "DecodeIPFW";
    tmm_modules[TMM_DECODEIPFW].ThreadInit = DecodeIPFWThreadInit;
    tmm_modules[TMM_DECODEIPFW].Func = DecodeIPFW;
    tmm_modules[TMM_DECODEIPFW].ThreadExitPrintStats = NULL;
    tmm_modules[TMM_DECODEIPFW].ThreadDeinit = DecodeIPFWThreadDeinit;
    tmm_modules[TMM_DECODEIPFW].flags = TM_FLAG_DECODE_TM;
}
 
static inline void IPFWMutexInit(IPFWQueueVars *nq)
{
    char *active_runmode = RunmodeGetActive();
 
    if (active_runmode && !strcmp("workers", active_runmode)) {
        nq->use_mutex = 0;
        SCLogInfo("IPFW running in 'workers' runmode, will not use mutex.");
    } else {
        nq->use_mutex = 1;
    }
    if (nq->use_mutex)
        SCMutexInit(&nq->socket_lock, NULL);
}
 
static inline void IPFWMutexLock(IPFWQueueVars *nq)
{
    if (nq->use_mutex)
        SCMutexLock(&nq->socket_lock);
}
 
static inline void IPFWMutexUnlock(IPFWQueueVars *nq)
{
    if (nq->use_mutex)
        SCMutexUnlock(&nq->socket_lock);
}
 
#ifndef IP_MAXPACKET
#define IP_MAXPACKET 65535
#endif
 
TmEcode ReceiveIPFWLoop(ThreadVars *tv, void *data, void *slot)
{
    SCEnter();
 
    IPFWThreadVars *ptv = (IPFWThreadVars *)data;
    IPFWQueueVars *nq = NULL;
    uint8_t pkt[IP_MAXPACKET];
    int pktlen=0;
    struct pollfd IPFWpoll;
    struct timeval IPFWts;
    Packet *p = NULL;
 
    nq = IPFWGetQueue(ptv->ipfw_index);
    if (nq == NULL) {
        SCLogWarning("Can't get thread variable");
        SCReturnInt(TM_ECODE_FAILED);
    }
 
    SCLogInfo("Thread '%s' will run on port %d (item %d)",
              tv->name, nq->port_num, ptv->ipfw_index);
 
    // Indicate that the thread is actually running its application level code (i.e., it can poll
    // packets)
    TmThreadsSetFlag(tv, THV_RUNNING);
 
    while (1) {
        if (unlikely(suricata_ctl_flags != 0)) {
            SCReturnInt(TM_ECODE_OK);
        }
 
        IPFWpoll.fd = nq->fd;
        IPFWpoll.events = POLLRDNORM;
        /* Poll the socket for status */
        if ( (poll(&IPFWpoll, 1, IPFW_SOCKET_POLL_MSEC)) > 0) {
            if (!(IPFWpoll.revents & (POLLRDNORM | POLLERR)))
                continue;
        }
 
        if ((pktlen = recvfrom(nq->fd, pkt, sizeof(pkt), 0,
                               (struct sockaddr *)&nq->ipfw_sin,
                               &nq->ipfw_sinlen)) == -1) {
            /* We received an error on socket read */
            if (errno == EINTR || errno == EWOULDBLOCK) {
                /* Nothing for us to process */
                continue;
            } else {
                SCLogWarning("Read from IPFW divert socket failed: %s", strerror(errno));
                SCReturnInt(TM_ECODE_FAILED);
            }
        }
        /* We have a packet to process */
        memset (&IPFWts, 0, sizeof(struct timeval));
        gettimeofday(&IPFWts, NULL);
 
        /* make sure we have at least one packet in the packet pool, to prevent
         * us from alloc'ing packets at line rate */
        PacketPoolWait();
 
        p = PacketGetFromQueueOrAlloc();
        if (p == NULL) {
            SCReturnInt(TM_ECODE_FAILED);
        }
        PKT_SET_SRC(p, PKT_SRC_WIRE);
 
        SCLogDebug("Received Packet Len: %d", pktlen);
 
        p->ts = SCTIME_FROM_TIMEVAL(&IPFWts);
 
        ptv->pkts++;
        ptv->bytes += pktlen;
 
        p->datalink = ptv->datalink;
 
        p->ipfw_v.ipfw_index = ptv->ipfw_index;
 
        PacketCopyData(p, pkt, pktlen);
        SCLogDebug("Packet info: pkt_len: %" PRIu32 " (pkt %02x, pkt_data %02x)",
                   GET_PKT_LEN(p), *pkt, *(GET_PKT_DATA(p)));
 
        if (TmThreadsSlotProcessPkt(tv, ((TmSlot *) slot)->slot_next, p)
                != TM_ECODE_OK) {
            SCReturnInt(TM_ECODE_FAILED);
        }
 
        StatsSyncCountersIfSignalled(tv);
    }
 
    SCReturnInt(TM_ECODE_OK);
}
 
/**
 * \brief Init function for RecieveIPFW.
 *
 * This is a setup function for receiving packets
 * via ipfw divert, binds a socket, and prepares to
 * to read from it.
 *
 * \param tv pointer to ThreadVars
 * \param initdata pointer to the divert port passed from the user
 * \param data pointer gets populated with IPFWThreadVars
 *
 */
TmEcode ReceiveIPFWThreadInit(ThreadVars *tv, const void *initdata, void **data)
{
    struct timeval timev;
    IPFWThreadVars *ntv = (IPFWThreadVars *) initdata;
    IPFWQueueVars *nq = IPFWGetQueue(ntv->ipfw_index);
 
    sigset_t sigs;
    sigfillset(&sigs);
    pthread_sigmask(SIG_UNBLOCK, &sigs, NULL);
 
    SCEnter();
 
    IPFWMutexInit(nq);
    /* We need a divert socket to play with */
#ifdef PF_DIVERT
    if ((nq->fd = socket(PF_DIVERT, SOCK_RAW, 0)) == -1) {
#else
    if ((nq->fd = socket(PF_INET, SOCK_RAW, IPPROTO_DIVERT)) == -1) {
#endif
        SCLogError("Can't create divert socket: %s", strerror(errno));
        SCReturnInt(TM_ECODE_FAILED);
    }
 
    /* set a timeout to the socket so we can check for a signal
     * in case we don't get packets for a longer period. */
    timev.tv_sec = 1;
    timev.tv_usec = 0;
 
    if (setsockopt(nq->fd, SOL_SOCKET, SO_RCVTIMEO, &timev, sizeof(timev)) == -1) {
        SCLogError("Can't set IPFW divert socket timeout: %s", strerror(errno));
        SCReturnInt(TM_ECODE_FAILED);
    }
 
    nq->ipfw_sinlen=sizeof(nq->ipfw_sin);
    memset(&nq->ipfw_sin, 0, nq->ipfw_sinlen);
    nq->ipfw_sin.sin_family = PF_INET;
    nq->ipfw_sin.sin_addr.s_addr = INADDR_ANY;
    nq->ipfw_sin.sin_port = htons(nq->port_num);
 
    /* Bind that SOB */
    if (bind(nq->fd, (struct sockaddr *)&nq->ipfw_sin, nq->ipfw_sinlen) == -1) {
        SCLogError("Can't bind divert socket on port %d: %s", nq->port_num, strerror(errno));
        SCReturnInt(TM_ECODE_FAILED);
    }
 
    ntv->datalink = DLT_RAW;
    DatalinkSetGlobalType(DLT_RAW);
 
    *data = (void *)ntv;
 
    SCReturnInt(TM_ECODE_OK);
}
 
/**
 * \brief This function prints stats to the screen at exit.
 * \todo Unit tests are needed for this module.
 * \param tv pointer to ThreadVars
 * \param data pointer that gets cast into IPFWThreadVars for ptv
 */
void ReceiveIPFWThreadExitStats(ThreadVars *tv, void *data)
{
    IPFWThreadVars *ptv = (IPFWThreadVars *)data;
 
    SCEnter();
 
    SCLogNotice("(%s) Treated: Pkts %" PRIu32 ", Bytes %" PRIu64 ", Errors %" PRIu32 "",
            tv->name, ptv->pkts, ptv->bytes, ptv->errs);
    SCLogNotice("(%s) Verdict: Accepted %"PRIu32", Dropped %"PRIu32 "",
            tv->name, ptv->accepted, ptv->dropped);
 
 
    SCReturn;
}
 
/**
 * \brief DeInit function closes divert socket at exit.
 * \todo Unit tests are needed for this module.
 * \param tv pointer to ThreadVars
 * \param data pointer that gets cast into IPFWThreadVars for ptv
 */
TmEcode ReceiveIPFWThreadDeinit(ThreadVars *tv, void *data)
{
    IPFWThreadVars *ptv = (IPFWThreadVars *)data;
    IPFWQueueVars *nq = IPFWGetQueue(ptv->ipfw_index);
 
    SCEnter();
 
    if (close(nq->fd) < 0) {
        SCLogWarning("Unable to disable ipfw socket: %s", strerror(errno));
        SCReturnInt(TM_ECODE_FAILED);
    }
 
    SCReturnInt(TM_ECODE_OK);
}
 
/**
 * \brief This function passes off to link type decoders.
 * \todo Unit tests are needed for this module.
 *
 * DecodeIPFW decodes packets from IPFW and passes
 * them off to the proper link type decoder.
 *
 * \param tv pointer to ThreadVars
 * \param p pointer to the current packet
 * \param data pointer that gets cast into IPFWThreadVars for ptv
 */
TmEcode DecodeIPFW(ThreadVars *tv, Packet *p, void *data)
{
    IPV4Hdr *ip4h = (IPV4Hdr *)GET_PKT_DATA(p);
    IPV6Hdr *ip6h = (IPV6Hdr *)GET_PKT_DATA(p);
    DecodeThreadVars *dtv = (DecodeThreadVars *)data;
 
    SCEnter();
 
    BUG_ON(PKT_IS_PSEUDOPKT(p));
 
    /* update counters */
    DecodeUpdatePacketCounters(tv, dtv, p);
 
    /* Process IP packets */
    if (IPV4_GET_RAW_VER(ip4h) == 4) {
        if (unlikely(GET_PKT_LEN(p) > USHRT_MAX)) {
            return TM_ECODE_FAILED;
        }
        SCLogDebug("DecodeIPFW ip4 processing");
        DecodeIPV4(tv, dtv, p, GET_PKT_DATA(p), GET_PKT_LEN(p));
 
    } else if(IPV6_GET_RAW_VER(ip6h) == 6) {
        if (unlikely(GET_PKT_LEN(p) > USHRT_MAX)) {
            return TM_ECODE_FAILED;
        }
        SCLogDebug("DecodeIPFW ip6 processing");
        DecodeIPV6(tv, dtv, p, GET_PKT_DATA(p), GET_PKT_LEN(p));
 
    } else {
        /* We don't support anything besides IP packets for now, bridged packets? */
        SCLogInfo("IPFW unknown protocol support %02x", *GET_PKT_DATA(p));
       SCReturnInt(TM_ECODE_FAILED);
    }
 
    PacketDecodeFinalize(tv, dtv, p);
 
    SCReturnInt(TM_ECODE_OK);
}
 
/**
 * \brief This function initializes the DecodeThreadVariables
 *
 *
 * \param tv pointer to ThreadVars
 * \param initdata pointer for passing in args
 * \param data pointer that gets cast into IPFWThreadVars for ptv
 */
TmEcode DecodeIPFWThreadInit(ThreadVars *tv, const void *initdata, void **data)
{
    DecodeThreadVars *dtv = NULL;
    dtv = DecodeThreadVarsAlloc(tv);
 
    if (dtv == NULL)
        SCReturnInt(TM_ECODE_FAILED);
 
    DecodeRegisterPerfCounters(dtv, tv);
 
    *data = (void *)dtv;
 
    SCReturnInt(TM_ECODE_OK);
}
 
TmEcode DecodeIPFWThreadDeinit(ThreadVars *tv, void *data)
{
    if (data != NULL)
        DecodeThreadVarsFree(tv, data);
    SCReturnInt(TM_ECODE_OK);
}
 
/**
 * \brief This function sets the Verdict and processes the packet
 *
 *
 * \param tv pointer to ThreadVars
 * \param p pointer to the Packet
 */
TmEcode IPFWSetVerdict(ThreadVars *tv, IPFWThreadVars *ptv, Packet *p)
{
    uint32_t verdict;
#if 0
    struct pollfd IPFWpoll;
#endif
    IPFWQueueVars *nq = NULL;
 
    SCEnter();
 
    if (p == NULL) {
        SCLogWarning("Packet is NULL");
        SCReturnInt(TM_ECODE_FAILED);
    }
 
    nq = IPFWGetQueue(p->ipfw_v.ipfw_index);
    if (nq == NULL) {
        SCLogWarning("No thread found");
        SCReturnInt(TM_ECODE_FAILED);
    }
 
#if 0
    IPFWpoll.fd = nq->fd;
    IPFWpoll.events = POLLWRNORM;
#endif
 
    if (PacketCheckAction(p, ACTION_DROP)) {
        verdict = IPFW_DROP;
    } else {
        verdict = IPFW_ACCEPT;
    }
 
    if (verdict == IPFW_ACCEPT) {
        SCLogDebug("IPFW Verdict is to Accept");
        ptv->accepted++;
 
        /* For divert sockets, accepting means writing the
         * packet back to the socket for ipfw to pick up
         */
        SCLogDebug("IPFWSetVerdict writing to socket %d, %p, %u", nq->fd, GET_PKT_DATA(p),GET_PKT_LEN(p));
 
#if 0
        while ((poll(&IPFWpoll,1,IPFW_SOCKET_POLL_MSEC)) < 1) {
            /* Did we receive a signal to shutdown */
            if (TmThreadsCheckFlag(tv, THV_KILL) || TmThreadsCheckFlag(tv, THV_PAUSE)) {
                SCLogInfo("Received ThreadShutdown: IPFW divert socket writing interrupted");
                SCReturnInt(TM_ECODE_OK);
            }
        }
#endif
 
        IPFWMutexLock(nq);
        if (sendto(nq->fd, GET_PKT_DATA(p), GET_PKT_LEN(p), 0,(struct sockaddr *)&nq->ipfw_sin, nq->ipfw_sinlen) == -1) {
            int r = errno;
            switch (r) {
                default:
                    SCLogWarning("Write to ipfw divert socket failed: %s", strerror(r));
                    IPFWMutexUnlock(nq);
                    SCReturnInt(TM_ECODE_FAILED);
                case EHOSTDOWN:
                case ENETDOWN:
                    break;
            }
        }
 
        IPFWMutexUnlock(nq);
 
        SCLogDebug("Sent Packet back into IPFW Len: %d",GET_PKT_LEN(p));
 
    } /* end IPFW_ACCEPT */
 
 
    if (verdict == IPFW_DROP) {
        SCLogDebug("IPFW SetVerdict is to DROP");
        ptv->dropped++;
 
        /** \todo For divert sockets, dropping means not writing the packet back to the socket.
         * Need to see if there is some better way to free the packet from the queue */
 
    } /* end IPFW_DROP */
 
    SCReturnInt(TM_ECODE_OK);
}
 
 
/**
 * \brief This function handles the Verdict processing
 * \todo Unit tests are needed for this module.
 *
 *
 * \param tv pointer to ThreadVars
 * \param p pointer to the Packet
 * \param data pointer that gets cast into IPFWThreadVars for ptv
 */
TmEcode VerdictIPFW(ThreadVars *tv, Packet *p, void *data)
{
    IPFWThreadVars *ptv = (IPFWThreadVars *)data;
    TmEcode retval = TM_ECODE_OK;
 
    SCEnter();
 
    /* can't verdict a "fake" packet */
    if (p->flags & PKT_PSEUDO_STREAM_END) {
        SCReturnInt(TM_ECODE_OK);
    }
 
    /* This came from NFQ.
     * If this is a tunnel packet we check if we are ready to verdict already. */
    if (PacketIsTunnel(p)) {
        bool verdict = VerdictTunnelPacket(p);
 
        /* don't verdict if we are not ready */
        if (verdict) {
            SCLogDebug("Setting verdict on tunnel");
            retval = IPFWSetVerdict(tv, ptv, p->root ? p->root : p);
        }
    } else {
        /* no tunnel, verdict normally */
        SCLogDebug("Setting verdict on non-tunnel");
        retval = IPFWSetVerdict(tv, ptv, p);
    }
 
    SCReturnInt(retval);
}
 
/**
 * \brief This function initializes the VerdictThread
 *
 *
 * \param t pointer to ThreadVars
 * \param initdata pointer for passing in args
 * \param data pointer that gets cast into IPFWThreadVars for ptv
 */
TmEcode VerdictIPFWThreadInit(ThreadVars *tv, const void *initdata, void **data)
{
 
    IPFWThreadVars *ptv = NULL;
 
    SCEnter();
 
    /* Setup Thread vars */
    if ((ptv = SCCalloc(1, sizeof(IPFWThreadVars))) == NULL)
        SCReturnInt(TM_ECODE_FAILED);
 
    *data = (void *)ptv;
 
    SCReturnInt(TM_ECODE_OK);
}
 
/**
 * \brief This function deinitializes the VerdictThread
 *
 *
 * \param tv pointer to ThreadVars
 * \param data pointer that gets cast into IPFWThreadVars for ptv
 */
TmEcode VerdictIPFWThreadDeinit(ThreadVars *tv, void *data)
{
 
    SCEnter();
 
    /* We don't need to do anything...not sure quite yet */
 
 
    SCReturnInt(TM_ECODE_OK);
}
 
/**
 * \brief This function prints stats for the VerdictThread
 *
 *
 * \param tv pointer to ThreadVars
 * \param data pointer that gets cast into IPFWThreadVars for ptv
 */
void VerdictIPFWThreadExitStats(ThreadVars *tv, void *data)
{
    IPFWThreadVars *ptv = (IPFWThreadVars *)data;
    SCLogInfo("IPFW Processing: - (%s) Pkts accepted %" PRIu32 ", dropped %" PRIu32 "", tv->name, ptv->accepted, ptv->dropped);
}
 
/**
 *  \brief Add an IPFW divert
 *
 *  \param string with the queue name
 *
 *  \retval 0 on success.
 *  \retval -1 on failure.
 */
int IPFWRegisterQueue(char *queue)
{
    IPFWThreadVars *ntv = NULL;
    IPFWQueueVars *nq = NULL;
    /* Extract the queue number from the specified command line argument */
    uint16_t port_num = 0;
    if ((StringParseUint16(&port_num, 10, strlen(queue), queue)) < 0)
    {
        SCLogError("specified queue number %s is not "
                   "valid",
                queue);
        return -1;
    }
 
    SCMutexLock(&ipfw_init_lock);
    if (receive_port_num >= IPFW_MAX_QUEUE) {
        SCLogError("too much IPFW divert port registered (%d)", receive_port_num);
        SCMutexUnlock(&ipfw_init_lock);
        return -1;
    }
    if (receive_port_num == 0) {
        memset(&ipfw_t, 0, sizeof(ipfw_t));
        memset(&ipfw_q, 0, sizeof(ipfw_q));
    }
 
    ntv = &ipfw_t[receive_port_num];
    ntv->ipfw_index = receive_port_num;
 
    nq = &ipfw_q[receive_port_num];
    nq->port_num = port_num;
    receive_port_num++;
    SCMutexUnlock(&ipfw_init_lock);
    LiveRegisterDeviceName(queue);
 
    SCLogDebug("Queue \"%s\" registered.", queue);
    return 0;
}
 
/**
 *  \brief Get a pointer to the IPFW queue at index
 *
 *  \param number idx of the queue in our array
 *
 *  \retval ptr pointer to the IPFWThreadVars at index
 *  \retval NULL on error
 */
void *IPFWGetQueue(int number)
{
    if (number >= receive_port_num)
        return NULL;
 
    return (void *)&ipfw_q[number];
}
 
/**
 *  \brief Get a pointer to the IPFW thread at index
 *
 *  This function is temporary used as configuration parser.
 *
 *  \param number idx of the queue in our array
 *
 *  \retval ptr pointer to the IPFWThreadVars at index
 *  \retval NULL on error
 */
void *IPFWGetThread(int number)
{
    if (number >= receive_port_num)
        return NULL;
 
    return (void *)&ipfw_t[number];
}
 
#endif /* End ifdef IPFW */
 
/* eof */