/*
 * Copyright (C) 2019-2022 by Sukchan Lee <acetcom@gmail.com>
 *
 * This file is part of Open5GS.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

#include "ogs-proto.h"

#define PLMN_ID_DIGIT1(x) (((x) / 100) % 10)
#define PLMN_ID_DIGIT2(x) (((x) / 10) % 10)
#define PLMN_ID_DIGIT3(x) ((x) % 10)

uint32_t ogs_plmn_id_hexdump(void *plmn_id)
{
    uint32_t hex;
    ogs_assert(plmn_id);
    memcpy(&hex, plmn_id, sizeof(ogs_plmn_id_t));
    hex = be32toh(hex) >> 8;
    return hex;
}

uint16_t ogs_plmn_id_mcc(ogs_plmn_id_t *plmn_id)
{
    return plmn_id->mcc1 * 100 + plmn_id->mcc2 * 10 + plmn_id->mcc3;
}
uint16_t ogs_plmn_id_mnc(ogs_plmn_id_t *plmn_id)
{
    return plmn_id->mnc1 == 0xf ? plmn_id->mnc2 * 10 + plmn_id->mnc3 :
        plmn_id->mnc1 * 100 + plmn_id->mnc2 * 10 + plmn_id->mnc3;
}
uint16_t ogs_plmn_id_mnc_len(ogs_plmn_id_t *plmn_id)
{
    return plmn_id->mnc1 == 0xf ? 2 : 3;
}

void *ogs_plmn_id_build(ogs_plmn_id_t *plmn_id, 
        uint16_t mcc, uint16_t mnc, uint16_t mnc_len)
{
    plmn_id->mcc1 = PLMN_ID_DIGIT1(mcc);
    plmn_id->mcc2 = PLMN_ID_DIGIT2(mcc);
    plmn_id->mcc3 = PLMN_ID_DIGIT3(mcc);

    if (mnc_len == 2)
        plmn_id->mnc1 = 0xf;
    else
        plmn_id->mnc1 = PLMN_ID_DIGIT1(mnc);

    plmn_id->mnc2 = PLMN_ID_DIGIT2(mnc);
    plmn_id->mnc3 = PLMN_ID_DIGIT3(mnc);

    return plmn_id;
}

void *ogs_nas_from_plmn_id(
        ogs_nas_plmn_id_t *ogs_nas_plmn_id, ogs_plmn_id_t *plmn_id)
{
    memcpy(ogs_nas_plmn_id, plmn_id, OGS_PLMN_ID_LEN);
    if (plmn_id->mnc1 != 0xf) {
        ogs_nas_plmn_id->mnc1 = plmn_id->mnc1;
        ogs_nas_plmn_id->mnc2 = plmn_id->mnc2;
        ogs_nas_plmn_id->mnc3 = plmn_id->mnc3;
    }
    return ogs_nas_plmn_id;
}
void *ogs_nas_to_plmn_id(
        ogs_plmn_id_t *plmn_id, ogs_nas_plmn_id_t *ogs_nas_plmn_id)
{
    memcpy(plmn_id, ogs_nas_plmn_id, OGS_PLMN_ID_LEN);
    if (plmn_id->mnc1 != 0xf) {
        plmn_id->mnc1 = ogs_nas_plmn_id->mnc1;
        plmn_id->mnc2 = ogs_nas_plmn_id->mnc2;
        plmn_id->mnc3 = ogs_nas_plmn_id->mnc3;
    }
    return plmn_id;
}

char *ogs_serving_network_name_from_plmn_id(ogs_plmn_id_t *plmn_id)
{
    ogs_assert(plmn_id);
    return ogs_msprintf("5G:mnc%03d.mcc%03d.3gppnetwork.org",
            ogs_plmn_id_mnc(plmn_id), ogs_plmn_id_mcc(plmn_id));
}

char *ogs_plmn_id_mcc_string(ogs_plmn_id_t *plmn_id)
{
    ogs_assert(plmn_id);
    return ogs_msprintf("%03d", ogs_plmn_id_mcc(plmn_id));
}

char *ogs_plmn_id_mnc_string(ogs_plmn_id_t *plmn_id)
{
    ogs_assert(plmn_id);
    if (ogs_plmn_id_mnc_len(plmn_id) == 2)
        return ogs_msprintf("%02d", ogs_plmn_id_mnc(plmn_id));
    else
        return ogs_msprintf("%03d", ogs_plmn_id_mnc(plmn_id));
}

char *ogs_plmn_id_to_string(ogs_plmn_id_t *plmn_id, char *buf)
{
    ogs_assert(plmn_id);
    ogs_assert(buf);

    if (ogs_plmn_id_mnc_len(plmn_id) == 2)
        ogs_snprintf(buf, OGS_PLMNIDSTRLEN, "%03d%02d",
                ogs_plmn_id_mcc(plmn_id), ogs_plmn_id_mnc(plmn_id));
    else
        ogs_snprintf(buf, OGS_PLMNIDSTRLEN, "%03d%03d",
                ogs_plmn_id_mcc(plmn_id), ogs_plmn_id_mnc(plmn_id));

    return buf;
}

uint32_t ogs_amf_id_hexdump(ogs_amf_id_t *amf_id)
{
    uint32_t hex;

    ogs_assert(amf_id);

    memcpy(&hex, amf_id, sizeof(ogs_amf_id_t));
    hex = be32toh(hex) >> 8;

    return hex;
}

ogs_amf_id_t *ogs_amf_id_from_string(ogs_amf_id_t *amf_id, const char *hex)
{
    char hexbuf[sizeof(ogs_amf_id_t)];

    ogs_assert(amf_id);
    ogs_assert(hex);

    ogs_hex_from_string(hex, hexbuf, sizeof(hexbuf));

    amf_id->region = hexbuf[0];
    amf_id->set1 = hexbuf[1];
    amf_id->set2 = (hexbuf[2] & 0xc0) >> 6;
    amf_id->pointer = hexbuf[2] & 0x3f;

    return amf_id;
}

#define OGS_AMFIDSTRLEN    (sizeof(ogs_amf_id_t)*2+1)
char *ogs_amf_id_to_string(ogs_amf_id_t *amf_id)
{
    char *str = NULL;
    ogs_assert(amf_id);

    str = ogs_calloc(1, OGS_AMFIDSTRLEN);
    ogs_expect_or_return_val(str, NULL);

    ogs_hex_to_ascii(amf_id, sizeof(ogs_amf_id_t), str, OGS_AMFIDSTRLEN);

    return str;
}

uint8_t ogs_amf_region_id(ogs_amf_id_t *amf_id)
{
    ogs_assert(amf_id);
    return amf_id->region;
}
uint16_t ogs_amf_set_id(ogs_amf_id_t *amf_id)
{
    ogs_assert(amf_id);
    return (amf_id->set1 << 2) + amf_id->set2;
}
uint8_t ogs_amf_pointer(ogs_amf_id_t *amf_id)
{
    ogs_assert(amf_id);
    return amf_id->pointer;
}

ogs_amf_id_t *ogs_amf_id_build(ogs_amf_id_t *amf_id,
        uint8_t region, uint16_t set, uint8_t pointer)
{
    amf_id->region = region;
    amf_id->set1 = set >> 2;
    amf_id->set2 = set & 0x3;
    amf_id->pointer = pointer;

    return amf_id;
}

char *ogs_id_get_type(char *str)
{
    char *token, *p, *tmp;
    char *type = NULL;

    ogs_assert(str);
    tmp = ogs_strdup(str);
    if (!tmp) {
        ogs_error("ogs_strdup[%s] failed", str);
        goto cleanup;
    }

    p = tmp;
    token = strsep(&p, "-");
    if (!token) {
        ogs_error("strsep[%s] failed", str);
        goto cleanup;
    }
    type = ogs_strdup(token);
    if (!type) {
        ogs_error("ogs_strdup[%s:%s] failed", str, token);
        goto cleanup;
    }

cleanup:
    if (tmp)
        ogs_free(tmp);
    return type;
}

char *ogs_id_get_value(char *str)
{
    char *token, *p, *tmp;
    char *ueid = NULL;

    ogs_assert(str);
    tmp = ogs_strdup(str);
    if (!tmp) {
        ogs_error("ogs_strdup[%s] failed", str);
        goto cleanup;
    }

    p = tmp;
    token = strsep(&p, "-");
    if (!token) {
        ogs_error("strsep[%s] failed", str);
        goto cleanup;
    }
    token = strsep(&p, "-");
    if (!token) {
        ogs_error("strsep[%s] failed", str);
        goto cleanup;
    }
    ueid = ogs_strdup(token);
    if (!ueid) {
        ogs_error("ogs_strdup[%s:%s] failed", str, token);
        goto cleanup;
    }

cleanup:
    if (tmp)
        ogs_free(tmp);
    return ueid;
}

char *ogs_s_nssai_sd_to_string(ogs_uint24_t sd)
{
    char *string = NULL;

    if (sd.v == OGS_S_NSSAI_NO_SD_VALUE)
        return NULL;

    string = ogs_uint24_to_0string(sd);
    ogs_expect(string);

    return string;
}

ogs_uint24_t ogs_s_nssai_sd_from_string(const char *hex)
{
    ogs_uint24_t sd;

    sd.v = OGS_S_NSSAI_NO_SD_VALUE;
    if (hex == NULL)
        return sd;

    return ogs_uint24_from_string((char *)hex);
}

int ogs_fqdn_build(char *dst, char *src, int length)
{
    int i = 0, j = 0;

    for (i = 0, j = 0; i < length; i++, j++) {
        if (src[i] == '.') {
            dst[i-j] = j;
            j = -1;
        } else {
            dst[i+1] = src[i];
        }
    }
    dst[i-j] = j;

    return length+1;
}

int ogs_fqdn_parse(char *dst, char *src, int length)
{
    int i = 0, j = 0;
    uint8_t len = 0;

    while (i+1 < length) {
        len = src[i++];
        if ((j + len + 1) > length) {
            ogs_error("Invalid FQDN encoding[len:%d] + 1 > length[%d]",
                    len, length);
            ogs_log_hexdump(OGS_LOG_ERROR, (unsigned char *)src, length);
            return 0;
        }
        memcpy(&dst[j], &src[i], len);

        i += len;
        j += len;
        
        if (i+1 < length)
            dst[j++] = '.';
        else
            dst[j] = 0;
    }

    return j;
}

/* 8.13 Protocol Configuration Options (PCO) 
 * 10.5.6.3 Protocol configuration options in 3GPP TS 24.008 */
int ogs_pco_parse(ogs_pco_t *pco, unsigned char *data, int data_len)
{
    ogs_pco_t *source = (ogs_pco_t *)data;
    int size = 0;
    int i = 0;

    ogs_assert(pco);
    ogs_assert(data);
    ogs_assert(data_len);

    memset(pco, 0, sizeof(ogs_pco_t));

    pco->ext = source->ext;
    pco->configuration_protocol = source->configuration_protocol;
    size++;

    while(size < data_len && i < OGS_MAX_NUM_OF_PROTOCOL_OR_CONTAINER_ID) {
        ogs_pco_id_t *id = &pco->ids[i];
        ogs_assert(size + sizeof(id->id) <= data_len);
        memcpy(&id->id, data + size, sizeof(id->id));
        id->id = be16toh(id->id);
        size += sizeof(id->id);

        ogs_assert(size + sizeof(id->len) <= data_len);
        memcpy(&id->len, data + size, sizeof(id->len));
        size += sizeof(id->len);

        id->data = data + size;
        size += id->len;

        i++;
    }
    pco->num_of_id = i;
    ogs_assert(size == data_len);
    
    return size;
}
int ogs_pco_build(unsigned char *data, int data_len, ogs_pco_t *pco)
{
    ogs_pco_t target;
    int size = 0;
    int i = 0;

    ogs_assert(pco);
    ogs_assert(data);
    ogs_assert(data_len);

    memcpy(&target, pco, sizeof(ogs_pco_t));

    ogs_assert(size + 1 <= data_len);
    memcpy(data + size, &target, 1);
    size += 1;

    ogs_assert(target.num_of_id <= OGS_MAX_NUM_OF_PROTOCOL_OR_CONTAINER_ID);
    for (i = 0; i < target.num_of_id; i++) {
        ogs_pco_id_t *id = &target.ids[i];

        ogs_assert(size + sizeof(id->id) <= data_len);
        id->id = htobe16(id->id);
        memcpy(data + size, &id->id, sizeof(id->id));
        size += sizeof(id->id);

        ogs_assert(size + sizeof(id->len) <= data_len);
        memcpy(data + size, &id->len, sizeof(id->len));
        size += sizeof(id->len);

        ogs_assert(size + id->len <= data_len);
        memcpy(data + size, id->data, id->len);
        size += id->len;
    }

    return size;
}

int ogs_ip_to_sockaddr(ogs_ip_t *ip, uint16_t port, ogs_sockaddr_t **list)
{
    ogs_sockaddr_t *addr = NULL, *addr6 = NULL;

    ogs_assert(ip);
    ogs_assert(list);

    addr = ogs_calloc(1, sizeof(ogs_sockaddr_t));
    if (!addr) {
        ogs_error("ogs_calloc() failed");
        return OGS_ERROR;
    }
    addr->ogs_sa_family = AF_INET;
    addr->ogs_sin_port = htobe16(port);

    addr6 = ogs_calloc(1, sizeof(ogs_sockaddr_t));
    if (!addr6) {
        ogs_error("ogs_calloc() failed");
        ogs_free(addr);
        return OGS_ERROR;
    }
    addr6->ogs_sa_family = AF_INET6;
    addr6->ogs_sin_port = htobe16(port);

    if (ip->ipv4 && ip->ipv6) {
        addr->next = addr6;

        addr->sin.sin_addr.s_addr = ip->addr;
        memcpy(addr6->sin6.sin6_addr.s6_addr, ip->addr6, OGS_IPV6_LEN);

        *list = addr;
    } else if (ip->ipv4) {
        addr->sin.sin_addr.s_addr = ip->addr;
        ogs_free(addr6);

        *list = addr;
    } else if (ip->ipv6) {
        memcpy(addr6->sin6.sin6_addr.s6_addr, ip->addr6, OGS_IPV6_LEN);
        ogs_free(addr);

        *list = addr6;
    } else {
        ogs_error("No IPv4 and IPv6");
        ogs_free(addr);
        ogs_free(addr6);
        return OGS_ERROR;
    }

    return OGS_OK;
}

int ogs_sockaddr_to_ip(
        ogs_sockaddr_t *addr, ogs_sockaddr_t *addr6, ogs_ip_t *ip)
{
    ogs_expect_or_return_val(ip, OGS_ERROR);
    ogs_expect_or_return_val(addr || addr6, OGS_ERROR);

    memset(ip, 0, sizeof(ogs_ip_t));

    if (addr && addr6) {
        ip->ipv4 = 1;
        ip->ipv6 = 1;
        ip->len = OGS_IPV4V6_LEN;
        ip->addr = addr->sin.sin_addr.s_addr;
        memcpy(ip->addr6, addr6->sin6.sin6_addr.s6_addr, OGS_IPV6_LEN);
    } else if (addr) {
        ip->ipv4 = 1;
        ip->len = OGS_IPV4_LEN;
        ip->addr = addr->sin.sin_addr.s_addr;
    } else if (addr6) {
        ip->ipv6 = 1;
        ip->len = OGS_IPV6_LEN;
        memcpy(ip->addr6, addr6->sin6.sin6_addr.s6_addr, OGS_IPV6_LEN);
    } else
        ogs_assert_if_reached();

    return OGS_OK;
}

char *ogs_ipv4_to_string(uint32_t addr)
{
    char *buf = NULL;

    buf = ogs_calloc(1, OGS_ADDRSTRLEN);
    ogs_expect_or_return_val(buf, NULL);

    return (char*)OGS_INET_NTOP(&addr, buf);
}

char *ogs_ipv6addr_to_string(uint8_t *addr6)
{
    char *buf = NULL;
    ogs_assert(addr6);

    buf = ogs_calloc(1, OGS_ADDRSTRLEN);
    ogs_expect_or_return_val(buf, NULL);

    return (char *)OGS_INET6_NTOP(addr6, buf);
}

char *ogs_ipv6prefix_to_string(uint8_t *addr6, uint8_t prefixlen)
{
    char *buf = NULL;
    uint8_t tmp[OGS_IPV6_LEN];
    ogs_assert(addr6);

    memset(tmp, 0, OGS_IPV6_LEN);
    memcpy(tmp, addr6, prefixlen >> 3);

    buf = ogs_calloc(1, OGS_ADDRSTRLEN);
    ogs_expect_or_return_val(buf, NULL);

    if (OGS_INET6_NTOP(tmp, buf) == NULL) {
        ogs_fatal("Invalid IPv6 address");
        ogs_log_hexdump(OGS_LOG_FATAL, addr6, OGS_IPV6_LEN);
        ogs_assert_if_reached();
    }
    return ogs_mstrcatf(buf, "/%d", prefixlen);
}

int ogs_ipv4_from_string(uint32_t *addr, char *string)
{
    int rv;
    ogs_sockaddr_t tmp;

    ogs_assert(addr);
    ogs_assert(string);

    rv = ogs_inet_pton(AF_INET, string, &tmp);
    if (rv != OGS_OK) {
        ogs_error("Invalid IPv4 string = %s", string);
        return OGS_ERROR;
    }

    *addr = tmp.sin.sin_addr.s_addr;

    return OGS_OK;
}

int ogs_ipv6addr_from_string(uint8_t *addr6, char *string)
{
    int rv;
    ogs_sockaddr_t tmp;

    ogs_assert(addr6);
    ogs_assert(string);

    rv = ogs_inet_pton(AF_INET6, string, &tmp);
    if (rv != OGS_OK) {
        ogs_error("Invalid IPv6 string = %s", string);
        return OGS_ERROR;
    }

    memcpy(addr6, tmp.sin6.sin6_addr.s6_addr, OGS_IPV6_LEN);

    return OGS_OK;
}

int ogs_ipv6prefix_from_string(uint8_t *addr6, uint8_t *prefixlen, char *string)
{
    int rv;
    ogs_sockaddr_t tmp;
    char *v = NULL, *pv = NULL, *ipstr = NULL, *mask_or_numbits = NULL;

    ogs_assert(addr6);
    ogs_assert(prefixlen);
    ogs_assert(string);
    pv = v = ogs_strdup(string);
    ogs_expect_or_return_val(v, OGS_ERROR);

    ipstr = strsep(&v, "/");
    if (ipstr)
        mask_or_numbits = v;

    if (!ipstr || !mask_or_numbits) {
        ogs_error("Invalid IPv6 Prefix string = %s", v);
        ogs_free(v);
        return OGS_ERROR;
    }

    rv = ogs_inet_pton(AF_INET6, ipstr, &tmp);
    ogs_expect_or_return_val(rv == OGS_OK, rv);

    memcpy(addr6, tmp.sin6.sin6_addr.s6_addr, OGS_IPV6_LEN);
    *prefixlen = atoi(mask_or_numbits);

    ogs_free(pv);
    return OGS_OK;
}

int ogs_sockaddr_to_user_plane_ip_resource_info(
    ogs_sockaddr_t *addr, ogs_sockaddr_t *addr6,
    ogs_user_plane_ip_resource_info_t *info)
{
    ogs_assert(addr || addr6);
    ogs_assert(info);

    if (addr) {
        info->v4 = 1;
        info->addr = addr->sin.sin_addr.s_addr;
    }
    if (addr6) {
        info->v6 = 1;
        memcpy(info->addr6, addr6->sin6.sin6_addr.s6_addr, OGS_IPV6_LEN);
    }

    return OGS_OK;
}

int ogs_user_plane_ip_resource_info_to_sockaddr(
    ogs_user_plane_ip_resource_info_t *info,
    ogs_sockaddr_t **addr, ogs_sockaddr_t **addr6)
{
    ogs_assert(addr && addr6);
    ogs_assert(info);

    *addr = NULL;
    *addr6 = NULL;

    if (info->v4) {
        *addr = ogs_calloc(1, sizeof(**addr));
        ogs_assert(*addr);
        (*addr)->sin.sin_addr.s_addr = info->addr;
        (*addr)->ogs_sa_family = AF_INET;
    }

    if (info->v6) {
        *addr6 = ogs_calloc(1, sizeof(**addr6));
        ogs_assert(*addr6);
        memcpy((*addr6)->sin6.sin6_addr.s6_addr, info->addr6, OGS_IPV6_LEN);
        (*addr6)->ogs_sa_family = AF_INET6;
    }

    return OGS_OK;
}

ogs_slice_data_t *ogs_slice_find_by_s_nssai(
        ogs_slice_data_t *slice_data, int num_of_slice_data,
        ogs_s_nssai_t *s_nssai)
{
    int i;

    ogs_assert(slice_data);
    ogs_assert(num_of_slice_data);
    ogs_assert(s_nssai);

    /* Compare S-NSSAI */
    for (i = 0; i < num_of_slice_data; i++) {
        if (s_nssai->sst == slice_data[i].s_nssai.sst &&
                s_nssai->sd.v == slice_data[i].s_nssai.sd.v) {
            return slice_data + i;
        }
    }

    return NULL;
}

void ogs_subscription_data_free(ogs_subscription_data_t *subscription_data)
{
    int i, j;

    ogs_assert(subscription_data);

    if (subscription_data->imsi)
        ogs_free(subscription_data->imsi);
    if (subscription_data->mme_host)
        ogs_free(subscription_data->mme_host);
    if (subscription_data->mme_realm)
        ogs_free(subscription_data->mme_realm);

    for (i = 0; i < subscription_data->num_of_slice; i++) {
        ogs_slice_data_t *slice_data = &subscription_data->slice[i];

        for (j = 0; j < slice_data->num_of_session; j++) {
            if (slice_data->session[j].name)
                ogs_free(slice_data->session[j].name);
        }

        slice_data->num_of_session = 0;
    }

    subscription_data->num_of_slice = 0;

    subscription_data->num_of_msisdn = 0;
}

void ogs_session_data_free(ogs_session_data_t *session_data)
{
    int i;

    ogs_assert(session_data);

    if (session_data->session.name)
        ogs_free(session_data->session.name);

    for (i = 0; i < session_data->num_of_pcc_rule; i++)
        OGS_PCC_RULE_FREE(&session_data->pcc_rule[i]);
}

void ogs_ims_data_free(ogs_ims_data_t *ims_data)
{
    int i, j, k;

    ogs_assert(ims_data);

    for (i = 0; i < ims_data->num_of_media_component; i++) {
        ogs_media_component_t *media_component = &ims_data->media_component[i];

        for (j = 0; j < media_component->num_of_sub; j++) {
            ogs_media_sub_component_t *sub = &media_component->sub[j];

            for (k = 0; k < sub->num_of_flow; k++) {
                ogs_flow_t *flow = &sub->flow[k];

                if (flow->description) {
                    ogs_free(flow->description);
                } else
                    ogs_assert_if_reached();
            }
        }
    }
}

static int flow_rx_to_gx(ogs_flow_t *rx_flow, ogs_flow_t *gx_flow)
{
    int len;
    char *from_str, *to_str;

    ogs_assert(rx_flow);
    ogs_assert(gx_flow);

    if (!strncmp(rx_flow->description,
                "permit out", strlen("permit out"))) {
        gx_flow->direction = OGS_FLOW_DOWNLINK_ONLY;
        gx_flow->description = ogs_strdup(rx_flow->description);
        ogs_assert(gx_flow->description);

    } else if (!strncmp(rx_flow->description,
                "permit in", strlen("permit in"))) {
        gx_flow->direction = OGS_FLOW_UPLINK_ONLY;

        /* 'permit in' should be changed
         * 'permit out' in Gx Diameter */
        len = strlen(rx_flow->description)+2;
        gx_flow->description = ogs_calloc(1, len);
        ogs_assert(gx_flow->description);
        strcpy(gx_flow->description, "permit out");
        from_str = strstr(&rx_flow->description[strlen("permit in")], "from");
        ogs_assert(from_str);
        to_str = strstr(&rx_flow->description[strlen("permit in")], "to");
        ogs_assert(to_str);
        strncat(gx_flow->description,
            &rx_flow->description[strlen("permit in")],
            strlen(rx_flow->description) -
                strlen("permit in") - strlen(from_str));
        strcat(gx_flow->description, "from");
        strcat(gx_flow->description, &to_str[strlen("to")]);
        strcat(gx_flow->description, " to");
        strncat(gx_flow->description, &from_str[strlen("from")],
                strlen(from_str) - strlen(to_str) - strlen("from") - 1);
        ogs_assert(len == strlen(gx_flow->description)+1);
    } else {
        ogs_error("Invalid Flow Descripton : [%s]", rx_flow->description);
        return OGS_ERROR;
    }

    return OGS_OK;
}

int ogs_pcc_rule_num_of_flow_equal_to_media(
        ogs_pcc_rule_t *pcc_rule, ogs_media_component_t *media_component)
{
    int rv;
    int i, j, k;
    int matched = 0;
    int new = 0;

    ogs_assert(pcc_rule);
    ogs_assert(media_component);

    for (i = 0; i < media_component->num_of_sub; i++) {
        ogs_media_sub_component_t *sub = &media_component->sub[i];

        for (j = 0; j < sub->num_of_flow; j++) {
            new++;
        }
    }

    if (new == 0) {
        /* No new flow in Media-Component */
        return pcc_rule->num_of_flow;
    }

    for (i = 0; i < media_component->num_of_sub; i++) {
        ogs_media_sub_component_t *sub = &media_component->sub[i];

        for (j = 0; j < sub->num_of_flow &&
                    j < OGS_MAX_NUM_OF_FLOW_IN_MEDIA_SUB_COMPONENT; j++) {
            ogs_flow_t gx_flow;
            ogs_flow_t *rx_flow = &sub->flow[j];

            rv = flow_rx_to_gx(rx_flow, &gx_flow);
            if (rv != OGS_OK) {
                ogs_error("flow reformatting error");
                return OGS_ERROR;
            }

            for (k = 0; k < pcc_rule->num_of_flow; k++) {
                if (gx_flow.direction == pcc_rule->flow[k].direction &&
                    !strcmp(gx_flow.description,
                        pcc_rule->flow[k].description)) {
                    matched++;
                    break;
                }
            }

            OGS_FLOW_FREE(&gx_flow);
        }
    }

    return matched;
}

int ogs_pcc_rule_install_flow_from_media(
        ogs_pcc_rule_t *pcc_rule, ogs_media_component_t *media_component)
{
    int rv;
    int i, j;

    ogs_assert(pcc_rule);
    ogs_assert(media_component);

    /* Remove Flow from PCC Rule */
    for (i = 0; i < pcc_rule->num_of_flow; i++) {
        OGS_FLOW_FREE(&pcc_rule->flow[i]);
    }
    pcc_rule->num_of_flow = 0;

    for (i = 0; i < media_component->num_of_sub; i++) {
        ogs_media_sub_component_t *sub = &media_component->sub[i];

        /* Copy Flow to PCC Rule */
        for (j = 0; j < sub->num_of_flow &&
                    j < OGS_MAX_NUM_OF_FLOW_IN_MEDIA_SUB_COMPONENT; j++) {
            ogs_flow_t *rx_flow = NULL;
            ogs_flow_t *gx_flow = NULL;

            if (pcc_rule->num_of_flow < OGS_MAX_NUM_OF_FLOW_IN_PCC_RULE) {
                rx_flow = &sub->flow[j];
                gx_flow = &pcc_rule->flow[pcc_rule->num_of_flow];

                rv = flow_rx_to_gx(rx_flow, gx_flow);
                if (rv != OGS_OK) {
                    ogs_error("flow reformatting error");
                    return OGS_ERROR;
                }

                pcc_rule->num_of_flow++;
            } else {
                ogs_error("Overflow: Number of Flow");
                return OGS_ERROR;
            }
        }
    }

    return OGS_OK;
}

int ogs_pcc_rule_update_qos_from_media(
        ogs_pcc_rule_t *pcc_rule, ogs_media_component_t *media_component)
{
    int rv;
    int i, j;

    ogs_assert(pcc_rule);
    ogs_assert(media_component);

    pcc_rule->qos.mbr.downlink = 0;
    pcc_rule->qos.mbr.uplink = 0;
    pcc_rule->qos.gbr.downlink = 0;
    pcc_rule->qos.gbr.uplink = 0;

    for (i = 0; i < media_component->num_of_sub; i++) {
        ogs_media_sub_component_t *sub = &media_component->sub[i];

        for (j = 0; j < sub->num_of_flow &&
                    j < OGS_MAX_NUM_OF_FLOW_IN_MEDIA_SUB_COMPONENT; j++) {
            ogs_flow_t gx_flow;
            ogs_flow_t *rx_flow = &sub->flow[j];

            rv = flow_rx_to_gx(rx_flow, &gx_flow);
            if (rv != OGS_OK) {
                ogs_error("flow reformatting error");
                return OGS_ERROR;
            }

            if (gx_flow.direction == OGS_FLOW_DOWNLINK_ONLY) {
                if (sub->flow_usage == OGS_FLOW_USAGE_RTCP) {
                    if (media_component->rr_bandwidth &&
                        media_component->rs_bandwidth) {
                        pcc_rule->qos.mbr.downlink +=
                            (media_component->rr_bandwidth +
                            media_component->rs_bandwidth);
                    } else if (media_component->max_requested_bandwidth_dl) {
                        if (media_component->rr_bandwidth &&
                            !media_component->rs_bandwidth) {
                            pcc_rule->qos.mbr.downlink +=
                                ogs_max(0.05 *
                                    media_component->max_requested_bandwidth_dl,
                                    media_component->rr_bandwidth);
                        }
                        if (!media_component->rr_bandwidth &&
                            media_component->rs_bandwidth) {
                            pcc_rule->qos.mbr.downlink +=
                                ogs_max(0.05 *
                                    media_component->max_requested_bandwidth_dl,
                                    media_component->rs_bandwidth);
                        }
                        if (!media_component->rr_bandwidth &&
                            !media_component->rs_bandwidth) {
                            pcc_rule->qos.mbr.downlink +=
                                0.05 *
                                    media_component->max_requested_bandwidth_dl;
                        }
                    }
                } else {
                    if (gx_flow.description) {
                        pcc_rule->qos.mbr.downlink +=
                            media_component->max_requested_bandwidth_dl;
                        pcc_rule->qos.gbr.downlink +=
                            media_component->min_requested_bandwidth_dl;
                    }
                }
            } else if (gx_flow.direction == OGS_FLOW_UPLINK_ONLY) {
                if (sub->flow_usage == OGS_FLOW_USAGE_RTCP) {
                    if (media_component->rr_bandwidth &&
                        media_component->rs_bandwidth) {
                        pcc_rule->qos.mbr.uplink +=
                            (media_component->rr_bandwidth +
                            media_component->rs_bandwidth);
                    } else if (media_component->max_requested_bandwidth_ul) {
                        if (media_component->rr_bandwidth &&
                            !media_component->rs_bandwidth) {
                            pcc_rule->qos.mbr.uplink +=
                                ogs_max(0.05 *
                                    media_component->max_requested_bandwidth_ul,
                                    media_component->rr_bandwidth);
                        }
                        if (!media_component->rr_bandwidth &&
                            media_component->rs_bandwidth) {
                            pcc_rule->qos.mbr.uplink +=
                                ogs_max(0.05 *
                                    media_component->max_requested_bandwidth_ul,
                                    media_component->rs_bandwidth);
                        }
                        if (!media_component->rr_bandwidth &&
                            !media_component->rs_bandwidth) {
                            pcc_rule->qos.mbr.uplink +=
                                0.05 *
                                    media_component->max_requested_bandwidth_ul;
                        }
                    }
                } else {
                    if (gx_flow.description) {
                        pcc_rule->qos.mbr.uplink +=
                            media_component->max_requested_bandwidth_ul;
                        pcc_rule->qos.gbr.uplink +=
                            media_component->min_requested_bandwidth_ul;
                    }
                }
            } else
                ogs_assert_if_reached();

            OGS_FLOW_FREE(&gx_flow);
        }
    }

    if (pcc_rule->qos.mbr.downlink == 0) {
        pcc_rule->qos.mbr.downlink +=
            media_component->max_requested_bandwidth_dl;
        pcc_rule->qos.mbr.downlink +=
            (media_component->rr_bandwidth + media_component->rs_bandwidth);
    }

    if (pcc_rule->qos.mbr.uplink == 0) {
        pcc_rule->qos.mbr.uplink +=
            media_component->max_requested_bandwidth_ul;
        pcc_rule->qos.mbr.uplink +=
            (media_component->rr_bandwidth + media_component->rs_bandwidth);
    }

    if (pcc_rule->qos.gbr.downlink == 0)
        pcc_rule->qos.gbr.downlink = pcc_rule->qos.mbr.downlink;
    if (pcc_rule->qos.gbr.uplink == 0)
        pcc_rule->qos.gbr.uplink = pcc_rule->qos.mbr.uplink;

    return OGS_OK;
}