/* Copyright (C) 2007-2012 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 Victor Julien <victor@inliniac.net>
 */

#ifndef __FLOW_UTIL_H__
#define __FLOW_UTIL_H__

#include "flow.h"
#include "stream-tcp-private.h"

#define RESET_COUNTERS(f)                                                                          \
    do {                                                                                           \
        (f)->todstpktcnt = 0;                                                                      \
        (f)->tosrcpktcnt = 0;                                                                      \
        (f)->todstbytecnt = 0;                                                                     \
        (f)->tosrcbytecnt = 0;                                                                     \
    } while (0)

#define FLOW_INITIALIZE(f)                                                                         \
    do {                                                                                           \
        (f)->sp = 0;                                                                               \
        (f)->dp = 0;                                                                               \
        (f)->proto = 0;                                                                            \
        (f)->livedev = NULL;                                                                       \
        (f)->timeout_at = 0;                                                                       \
        (f)->timeout_policy = 0;                                                                   \
        (f)->vlan_idx = 0;                                                                         \
        (f)->next = NULL;                                                                          \
        (f)->flow_state = 0;                                                                       \
        (f)->tenant_id = 0;                                                                        \
        (f)->parent_id = 0;                                                                        \
        (f)->probing_parser_toserver_alproto_masks = 0;                                            \
        (f)->probing_parser_toclient_alproto_masks = 0;                                            \
        (f)->flags = 0;                                                                            \
        (f)->file_flags = 0;                                                                       \
        (f)->protodetect_dp = 0;                                                                   \
        SCTIME_INIT((f)->lastts);                                                                  \
        FLOWLOCK_INIT((f));                                                                        \
        (f)->protoctx = NULL;                                                                      \
        (f)->flow_end_flags = 0;                                                                   \
        (f)->alproto = 0;                                                                          \
        (f)->alproto_ts = 0;                                                                       \
        (f)->alproto_tc = 0;                                                                       \
        (f)->alproto_orig = 0;                                                                     \
        (f)->alproto_expect = 0;                                                                   \
        (f)->de_ctx_version = 0;                                                                   \
        (f)->thread_id[0] = 0;                                                                     \
        (f)->thread_id[1] = 0;                                                                     \
        (f)->alparser = NULL;                                                                      \
        (f)->alstate = NULL;                                                                       \
        (f)->sgh_toserver = NULL;                                                                  \
        (f)->sgh_toclient = NULL;                                                                  \
        (f)->flowvar = NULL;                                                                       \
        RESET_COUNTERS((f));                                                                       \
    } while (0)

/** \brief macro to recycle a flow before it goes into the spare queue for reuse.
 *
 *  Note that the lnext, lprev, hnext fields are untouched, those are
 *  managed by the queueing code. Same goes for fb (FlowBucket ptr) field.
 */
#define FLOW_RECYCLE(f)                                                                            \
    do {                                                                                           \
        FlowCleanupAppLayer((f));                                                                  \
        (f)->sp = 0;                                                                               \
        (f)->dp = 0;                                                                               \
        (f)->proto = 0;                                                                            \
        (f)->livedev = NULL;                                                                       \
        (f)->vlan_idx = 0;                                                                         \
        (f)->ffr = 0;                                                                              \
        (f)->next = NULL;                                                                          \
        (f)->timeout_at = 0;                                                                       \
        (f)->timeout_policy = 0;                                                                   \
        (f)->flow_state = 0;                                                                       \
        (f)->tenant_id = 0;                                                                        \
        (f)->parent_id = 0;                                                                        \
        (f)->probing_parser_toserver_alproto_masks = 0;                                            \
        (f)->probing_parser_toclient_alproto_masks = 0;                                            \
        (f)->flags = 0;                                                                            \
        (f)->file_flags = 0;                                                                       \
        (f)->protodetect_dp = 0;                                                                   \
        SCTIME_INIT((f)->lastts);                                                                  \
        (f)->protoctx = NULL;                                                                      \
        (f)->flow_end_flags = 0;                                                                   \
        (f)->alparser = NULL;                                                                      \
        (f)->alstate = NULL;                                                                       \
        (f)->alproto = 0;                                                                          \
        (f)->alproto_ts = 0;                                                                       \
        (f)->alproto_tc = 0;                                                                       \
        (f)->alproto_orig = 0;                                                                     \
        (f)->alproto_expect = 0;                                                                   \
        (f)->de_ctx_version = 0;                                                                   \
        (f)->thread_id[0] = 0;                                                                     \
        (f)->thread_id[1] = 0;                                                                     \
        (f)->sgh_toserver = NULL;                                                                  \
        (f)->sgh_toclient = NULL;                                                                  \
        GenericVarFree((f)->flowvar);                                                              \
        (f)->flowvar = NULL;                                                                       \
        RESET_COUNTERS((f));                                                                       \
    } while (0)

#define FLOW_DESTROY(f)                                                                            \
    do {                                                                                           \
        FlowCleanupAppLayer((f));                                                                  \
                                                                                                   \
        FLOWLOCK_DESTROY((f));                                                                     \
        GenericVarFree((f)->flowvar);                                                              \
    } while (0)

/** \brief check if a memory alloc would fit in the memcap
 *
 *  \param size memory allocation size to check
 *
 *  \retval 1 it fits
 *  \retval 0 no fit
 */
#define FLOW_CHECK_MEMCAP(size)                                                                    \
    ((((uint64_t)SC_ATOMIC_GET(flow_memuse) + (uint64_t)(size)) <=                                 \
            SC_ATOMIC_GET(flow_config.memcap)))

Flow *FlowAlloc(void);
void FlowFree(Flow *);
uint8_t FlowGetProtoMapping(uint8_t);
void FlowInit(Flow *, const Packet *);
uint8_t FlowGetReverseProtoMapping(uint8_t rproto);

/* flow end counter logic */

typedef struct FlowEndCounters_ {
    uint16_t flow_state[FLOW_STATE_SIZE];
    uint16_t flow_tcp_state[TCP_CLOSED + 1];
    uint16_t flow_tcp_liberal;
} FlowEndCounters;

static inline void FlowEndCountersUpdate(ThreadVars *tv, FlowEndCounters *fec, Flow *f)
{
    if (f->proto == IPPROTO_TCP && f->protoctx != NULL) {
        TcpSession *ssn = f->protoctx;
        StatsIncr(tv, fec->flow_tcp_state[ssn->state]);
        if (ssn->flags & STREAMTCP_FLAG_LOSSY_BE_LIBERAL) {
            StatsIncr(tv, fec->flow_tcp_liberal);
        }
    }
    StatsIncr(tv, fec->flow_state[f->flow_state]);
}

void FlowEndCountersRegister(ThreadVars *t, FlowEndCounters *fec);

#endif /* __FLOW_UTIL_H__ */