static bool TcpCaCheck(int flow_id)
{
unsigned long pkt_num;
pkt_num = FlowPktNum(flow_id);
if (pkt_num > limit_pkts || (pkt_num > 0 && FlowIsClose(flow_id) == TRUE)) {
return TRUE;
}
return FALSE;
}
static bool TcpCaCheckGrp(int flow_id)
{
unsigned long pkt_num;
bool elab;
tca_flow *niflw;
pkt_num = FlowPktNum(flow_id);
if (pkt_num > limit_pkts || (pkt_num > 0 && FlowIsClose(flow_id) == TRUE)) {
niflw = xmalloc(sizeof(tca_flow));
if (niflw == NULL) {
return FALSE;
}
memset(niflw, 0, sizeof(tca_flow));
niflw->nxt = NULL;
niflw->pre = NULL;
niflw->flow_id = flow_id;
niflw->pkt_elb = 0;
pthread_mutex_lock(&pthrs_mux);
niflw->nxt = prl_thrs[pthrs_ins];
prl_thrs[pthrs_ins] = niflw;
if (prl_thrs_en[pthrs_ins] != 0) {
elab = TRUE;
}
else {
prl_thrs_en[pthrs_ins] = 1;
elab = FALSE;
}
pthrs_ins++;
if (pthrs_dim == pthrs_ins) {
pthrs_ins = 0;
}
pthread_mutex_unlock(&pthrs_mux);
if (elab) {
FlowSetElab(flow_id, -1);
}
return TRUE;
}
return FALSE;
}
static bool RtpCheck(int flow_id)
{
const pstack_f *ip;
packet *pkt;
bool ret;
ftval ips, ipx, port;
bool ipv4, cmp;
int pt_1, pt_2;
unsigned int ssrc_1, ssrc_2;
int cnt, ecnt;
rtp_hdr *rtp;
unsigned short min_size;
if (FlowPktNum(flow_id) < RTP_PKT_LIMIT && FlowIsClose(flow_id) == FALSE) {
return FALSE;
}
ipv4 = FALSE;
ret = FALSE;
cnt = ecnt = 0;
pkt = FlowGetPktCp(flow_id);
if (pkt != NULL) {
/* check port */
ProtGetAttr(pkt->stk, uport_dst_id, &port);
if (port.uint16 < 1024) {
PktFree(pkt);
return FALSE;
}
ProtGetAttr(pkt->stk, uport_src_id, &port);
if (port.uint16 < 1024) {
PktFree(pkt);
return FALSE;
}
/* check ip */
ip = ProtGetNxtFrame(pkt->stk);
if (ProtFrameProtocol(ip) == ip_id)
ipv4 = TRUE;
if (ipv4 == TRUE)
ProtGetAttr(ip, ip_src_id, &ips);
else
ProtGetAttr(ip, ipv6_src_id, &ips);
while (pkt->len == 0) {
PktFree(pkt);
pkt = FlowGetPktCp(flow_id);
if (pkt == NULL)
break;
}
}
if (pkt != NULL) {
pt_1 = pt_2 = -1;
do {
if (pkt->len > sizeof(rtp_hdr)) {
rtp = (rtp_hdr *)pkt->data;
if (rtp->version != 2) {
cnt = 0;
ecnt++;
}
else {
ip = ProtGetNxtFrame(pkt->stk);
if (ipv4 == TRUE) {
ProtGetAttr(ip, ip_src_id, &ipx);
cmp = FTCmp(&ips, &ipx, FT_IPv4, FT_OP_EQ, NULL);
if (cmp) {
if (pt_1 == -1) {
pt_1 = rtp->pt;
ssrc_1 = rtp->ssrc;
}
else if (pt_1 != rtp->pt || ssrc_1 != rtp->ssrc)
break;
}
else {
if (pt_2 == -1) {
pt_2 = rtp->pt;
ssrc_2 = rtp->ssrc;
}
else if (pt_2 != rtp->pt || ssrc_2 != rtp->ssrc)
break;
}
/* check size */
if (rtp->cc != 0) {
min_size = rtp->cc * 4; /* every CSRC has 4 byte */
min_size += sizeof(rtp_hdr);
if (pkt->len < min_size)
break;
}
}
else {
ProtGetAttr(ip, ipv6_src_id, &ipx);
cmp = FTCmp(&ips, &ipx, FT_IPv6, FT_OP_EQ, NULL);
if (cmp) {
if (pt_1 == -1) {
pt_1 = rtp->pt;
ssrc_1 = rtp->ssrc;
}
else if (pt_1 != rtp->pt || ssrc_1 != rtp->ssrc)
break;
}
else {
if (pt_2 == -1) {
pt_2 = rtp->pt;
ssrc_2 = rtp->ssrc;
}
else if (pt_2 != rtp->pt || ssrc_2 != rtp->ssrc)
break;
}
/* check size */
if (rtp->cc != 0) {
min_size = rtp->cc * 4; /* every CSRC has 4 byte */
min_size += sizeof(rtp_hdr);
if (pkt->len < min_size)
break;
}
}
cnt++;
}
}
else {
cnt = 0;
ecnt++;
}
PktFree(pkt);
pkt = FlowGetPktCp(flow_id);
} while (ecnt != RTP_PKT_ERR_CHECK && cnt != RTP_PKT_CHECK && pkt != NULL);
}
if (pkt != NULL) {
PktFree(pkt);
pkt = NULL;
}
if (cnt == RTP_PKT_CHECK) {
ret = TRUE;
}
return ret;
}
