static int DecodeIPV6Packet (ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, uint8_t *pkt, uint16_t len)
{
if (unlikely(len < IPV6_HEADER_LEN)) {
return -1;
}
if (unlikely(IP_GET_RAW_VER(pkt) != 6)) {
SCLogDebug("wrong ip version %" PRIu8 "",IP_GET_RAW_VER(pkt));
ENGINE_SET_INVALID_EVENT(p, IPV6_WRONG_IP_VER);
return -1;
}
p->ip6h = (IPV6Hdr *)pkt;
if (unlikely(len < (IPV6_HEADER_LEN + IPV6_GET_PLEN(p))))
{
ENGINE_SET_INVALID_EVENT(p, IPV6_TRUNC_PKT);
return -1;
}
SET_IPV6_SRC_ADDR(p,&p->src);
SET_IPV6_DST_ADDR(p,&p->dst);
return 0;
}
static int DecodeTCPPacket(ThreadVars *tv, Packet *p, uint8_t *pkt, uint16_t len)
{
if (unlikely(len < TCP_HEADER_LEN)) {
ENGINE_SET_INVALID_EVENT(p, TCP_PKT_TOO_SMALL);
return -1;
}
p->tcph = (TCPHdr *)pkt;
uint8_t hlen = TCP_GET_HLEN(p);
if (unlikely(len < hlen)) {
ENGINE_SET_INVALID_EVENT(p, TCP_HLEN_TOO_SMALL);
return -1;
}
uint8_t tcp_opt_len = hlen - TCP_HEADER_LEN;
if (unlikely(tcp_opt_len > TCP_OPTLENMAX)) {
ENGINE_SET_INVALID_EVENT(p, TCP_INVALID_OPTLEN);
return -1;
}
if (likely(tcp_opt_len > 0)) {
DecodeTCPOptions(p, pkt + TCP_HEADER_LEN, tcp_opt_len);
}
SET_TCP_SRC_PORT(p,&p->sp);
SET_TCP_DST_PORT(p,&p->dp);
p->proto = IPPROTO_TCP;
p->payload = pkt + hlen;
p->payload_len = len - hlen;
return 0;
}
static int DecodeUDPPacket(ThreadVars *t, Packet *p, uint8_t *pkt, uint16_t len)
{
if (unlikely(len < UDP_HEADER_LEN)) {
ENGINE_SET_INVALID_EVENT(p, UDP_HLEN_TOO_SMALL);
return -1;
}
p->udph = (UDPHdr *)pkt;
if (unlikely(len < UDP_GET_LEN(p))) {
ENGINE_SET_INVALID_EVENT(p, UDP_PKT_TOO_SMALL);
return -1;
}
if (unlikely(len != UDP_GET_LEN(p))) {
ENGINE_SET_INVALID_EVENT(p, UDP_HLEN_INVALID);
return -1;
}
SET_UDP_SRC_PORT(p,&p->sp);
SET_UDP_DST_PORT(p,&p->dp);
p->payload = pkt + UDP_HEADER_LEN;
p->payload_len = len - UDP_HEADER_LEN;
p->proto = IPPROTO_UDP;
return 0;
}
int DecodeRaw(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, uint8_t *pkt, uint32_t len, PacketQueue *pq)
{
StatsIncr(tv, dtv->counter_raw);
/* If it is ipv4 or ipv6 it should at least be the size of ipv4 */
if (unlikely(len < IPV4_HEADER_LEN)) {
ENGINE_SET_INVALID_EVENT(p, IPV4_PKT_TOO_SMALL);
return TM_ECODE_FAILED;
}
if (IP_GET_RAW_VER(pkt) == 4) {
if (unlikely(GET_PKT_LEN(p) > USHRT_MAX)) {
return TM_ECODE_FAILED;
}
SCLogDebug("IPV4 Packet");
DecodeIPV4(tv, dtv, p, GET_PKT_DATA(p), GET_PKT_LEN(p), pq);
} else if (IP_GET_RAW_VER(pkt) == 6) {
if (unlikely(GET_PKT_LEN(p) > USHRT_MAX)) {
return TM_ECODE_FAILED;
}
SCLogDebug("IPV6 Packet");
DecodeIPV6(tv, dtv, p, GET_PKT_DATA(p), GET_PKT_LEN(p), pq);
} else {
SCLogDebug("Unknown ip version %" PRIu8 "", IP_GET_RAW_VER(pkt));
ENGINE_SET_EVENT(p,IPRAW_INVALID_IPV);
}
return TM_ECODE_OK;
}
int DecodeEthernet(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p,
uint8_t *pkt, uint16_t len, PacketQueue *pq)
{
StatsIncr(tv, dtv->counter_eth);
if (unlikely(len < ETHERNET_HEADER_LEN)) {
ENGINE_SET_INVALID_EVENT(p, ETHERNET_PKT_TOO_SMALL);
return TM_ECODE_FAILED;
}
p->ethh = (EthernetHdr *)pkt;
if (unlikely(p->ethh == NULL))
return TM_ECODE_FAILED;
SCLogDebug("p %p pkt %p ether type %04x", p, pkt, ntohs(p->ethh->eth_type));
switch (ntohs(p->ethh->eth_type)) {
case ETHERNET_TYPE_IP:
//printf("DecodeEthernet ip4\n");
DecodeIPV4(tv, dtv, p, pkt + ETHERNET_HEADER_LEN,
len - ETHERNET_HEADER_LEN, pq);
break;
case ETHERNET_TYPE_IPV6:
//printf("DecodeEthernet ip6\n");
DecodeIPV6(tv, dtv, p, pkt + ETHERNET_HEADER_LEN,
len - ETHERNET_HEADER_LEN, pq);
break;
case ETHERNET_TYPE_PPPOE_SESS:
//printf("DecodeEthernet PPPOE Session\n");
DecodePPPOESession(tv, dtv, p, pkt + ETHERNET_HEADER_LEN,
len - ETHERNET_HEADER_LEN, pq);
break;
case ETHERNET_TYPE_PPPOE_DISC:
//printf("DecodeEthernet PPPOE Discovery\n");
DecodePPPOEDiscovery(tv, dtv, p, pkt + ETHERNET_HEADER_LEN,
len - ETHERNET_HEADER_LEN, pq);
break;
case ETHERNET_TYPE_VLAN:
case ETHERNET_TYPE_8021QINQ:
DecodeVLAN(tv, dtv, p, pkt + ETHERNET_HEADER_LEN,
len - ETHERNET_HEADER_LEN, pq);
break;
case ETHERNET_TYPE_MPLS_UNICAST:
case ETHERNET_TYPE_MPLS_MULTICAST:
DecodeMPLS(tv, dtv, p, pkt + ETHERNET_HEADER_LEN,
len - ETHERNET_HEADER_LEN, pq);
break;
default:
SCLogDebug("p %p pkt %p ether type %04x not supported", p,
pkt, ntohs(p->ethh->eth_type));
}
return TM_ECODE_OK;
}
static int DecodeSCTPPacket(ThreadVars *tv, Packet *p, uint8_t *pkt, uint16_t len)
{
if (unlikely(len < SCTP_HEADER_LEN)) {
ENGINE_SET_INVALID_EVENT(p, SCTP_PKT_TOO_SMALL);
return -1;
}
p->sctph = (SCTPHdr *)pkt;
SET_SCTP_SRC_PORT(p,&p->sp);
SET_SCTP_DST_PORT(p,&p->dp);
p->payload = pkt + sizeof(SCTPHdr);
p->payload_len = len - sizeof(SCTPHdr);
p->proto = IPPROTO_SCTP;
return 0;
}
/**
* \brief Function to decode IPv6 in IPv6 packets
*
*/
static int DecodeIP6inIP6(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, uint8_t *pkt, uint16_t plen, PacketQueue *pq)
{
if (unlikely(plen < IPV6_HEADER_LEN)) {
ENGINE_SET_INVALID_EVENT(p, IPV6_IN_IPV6_PKT_TOO_SMALL);
return TM_ECODE_FAILED;
}
if (IP_GET_RAW_VER(pkt) == 6) {
if (unlikely(pq != NULL)) {
Packet *tp = PacketTunnelPktSetup(tv, dtv, p, pkt, plen, DECODE_TUNNEL_IPV6, pq);
if (tp != NULL) {
PKT_SET_SRC(tp, PKT_SRC_DECODER_IPV6);
PacketEnqueue(pq,tp);
StatsIncr(tv, dtv->counter_ipv6inipv6);
}
}
} else {
ENGINE_SET_EVENT(p, IPV6_IN_IPV6_WRONG_IP_VER);
}
return TM_ECODE_OK;
}
/**
* \brief Function to decode IPv4 in IPv6 packets
*
*/
static void DecodeIPv4inIPv6(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, uint8_t *pkt, uint16_t plen, PacketQueue *pq)
{
if (unlikely(plen < IPV4_HEADER_LEN)) {
ENGINE_SET_INVALID_EVENT(p, IPV4_IN_IPV6_PKT_TOO_SMALL);
return;
}
if (IP_GET_RAW_VER(pkt) == 4) {
if (pq != NULL) {
Packet *tp = PacketTunnelPktSetup(tv, dtv, p, pkt, plen, DECODE_TUNNEL_IPV4, pq);
if (tp != NULL) {
PKT_SET_SRC(tp, PKT_SRC_DECODER_IPV6);
/* add the tp to the packet queue. */
PacketEnqueue(pq,tp);
StatsIncr(tv, dtv->counter_ipv4inipv6);
return;
}
}
} else {
ENGINE_SET_EVENT(p, IPV4_IN_IPV6_WRONG_IP_VER);
}
return;
}
/**
* Note, this is the IP header, plus a bit of the original packet, not the whole thing!
*/
int DecodePartialIPV4( Packet* p, uint8_t* partial_packet, uint16_t len )
{
/** Check the sizes, the header must fit at least */
if (len < IPV4_HEADER_LEN) {
SCLogDebug("DecodePartialIPV4: ICMPV4_IPV4_TRUNC_PKT");
ENGINE_SET_INVALID_EVENT(p, ICMPV4_IPV4_TRUNC_PKT);
return -1;
}
IPV4Hdr *icmp4_ip4h = (IPV4Hdr*)partial_packet;
/** Check the embedded version */
if (IPV4_GET_RAW_VER(icmp4_ip4h) != 4) {
/** Check the embedded version */
SCLogDebug("DecodePartialIPV4: ICMPv4 contains Unknown IPV4 version "
"ICMPV4_IPV4_UNKNOWN_VER");
ENGINE_SET_INVALID_EVENT(p, ICMPV4_IPV4_UNKNOWN_VER);
return -1;
}
/** We need to fill icmpv4vars */
p->icmpv4vars.emb_ipv4h = icmp4_ip4h;
/** Get the IP address from the contained packet */
p->icmpv4vars.emb_ip4_src = IPV4_GET_RAW_IPSRC(icmp4_ip4h);
p->icmpv4vars.emb_ip4_dst = IPV4_GET_RAW_IPDST(icmp4_ip4h);
p->icmpv4vars.emb_ip4_hlen=IPV4_GET_RAW_HLEN(icmp4_ip4h) << 2;
switch (IPV4_GET_RAW_IPPROTO(icmp4_ip4h)) {
case IPPROTO_TCP:
if (len >= IPV4_HEADER_LEN + TCP_HEADER_LEN ) {
p->icmpv4vars.emb_tcph = (TCPHdr*)(partial_packet + IPV4_HEADER_LEN);
p->icmpv4vars.emb_sport = ntohs(p->icmpv4vars.emb_tcph->th_sport);
p->icmpv4vars.emb_dport = ntohs(p->icmpv4vars.emb_tcph->th_dport);
p->icmpv4vars.emb_ip4_proto = IPPROTO_TCP;
SCLogDebug("DecodePartialIPV4: ICMPV4->IPV4->TCP header sport: "
"%"PRIu8" dport %"PRIu8"", p->icmpv4vars.emb_sport,
p->icmpv4vars.emb_dport);
} else if (len >= IPV4_HEADER_LEN + 4) {
/* only access th_sport and th_dport */
TCPHdr *emb_tcph = (TCPHdr*)(partial_packet + IPV4_HEADER_LEN);
p->icmpv4vars.emb_tcph = NULL;
p->icmpv4vars.emb_sport = ntohs(emb_tcph->th_sport);
p->icmpv4vars.emb_dport = ntohs(emb_tcph->th_dport);
p->icmpv4vars.emb_ip4_proto = IPPROTO_TCP;
SCLogDebug("DecodePartialIPV4: ICMPV4->IPV4->TCP partial header sport: "
"%"PRIu8" dport %"PRIu8"", p->icmpv4vars.emb_sport,
p->icmpv4vars.emb_dport);
} else {
SCLogDebug("DecodePartialIPV4: Warning, ICMPV4->IPV4->TCP "
"header Didn't fit in the packet!");
p->icmpv4vars.emb_sport = 0;
p->icmpv4vars.emb_dport = 0;
}
break;
case IPPROTO_UDP:
if (len >= IPV4_HEADER_LEN + UDP_HEADER_LEN ) {
p->icmpv4vars.emb_udph = (UDPHdr*)(partial_packet + IPV4_HEADER_LEN);
p->icmpv4vars.emb_sport = ntohs(p->icmpv4vars.emb_udph->uh_sport);
p->icmpv4vars.emb_dport = ntohs(p->icmpv4vars.emb_udph->uh_dport);
p->icmpv4vars.emb_ip4_proto = IPPROTO_UDP;
SCLogDebug("DecodePartialIPV4: ICMPV4->IPV4->UDP header sport: "
"%"PRIu8" dport %"PRIu8"", p->icmpv4vars.emb_sport,
p->icmpv4vars.emb_dport);
} else {
SCLogDebug("DecodePartialIPV4: Warning, ICMPV4->IPV4->UDP "
"header Didn't fit in the packet!");
p->icmpv4vars.emb_sport = 0;
p->icmpv4vars.emb_dport = 0;
}
break;
case IPPROTO_ICMP:
if (len >= IPV4_HEADER_LEN + ICMPV4_HEADER_LEN ) {
p->icmpv4vars.emb_icmpv4h = (ICMPV4Hdr*)(partial_packet + IPV4_HEADER_LEN);
p->icmpv4vars.emb_sport = 0;
p->icmpv4vars.emb_dport = 0;
p->icmpv4vars.emb_ip4_proto = IPPROTO_ICMP;
SCLogDebug("DecodePartialIPV4: ICMPV4->IPV4->ICMP header");
}
break;
}
/* debug print */
#ifdef DEBUG
char s[16], d[16];
PrintInet(AF_INET, &(p->icmpv4vars.emb_ip4_src), s, sizeof(s));
PrintInet(AF_INET, &(p->icmpv4vars.emb_ip4_dst), d, sizeof(d));
SCLogDebug("ICMPv4 embedding IPV4 %s->%s - PROTO: %" PRIu32 " ID: %" PRIu32 "", s,d,
IPV4_GET_RAW_IPPROTO(icmp4_ip4h), IPV4_GET_RAW_IPID(icmp4_ip4h));
#endif
return 0;
}
/** DecodeICMPV4
* \brief Main ICMPv4 decoding function
*/
int DecodeICMPV4(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, uint8_t *pkt, uint16_t len, PacketQueue *pq)
{
StatsIncr(tv, dtv->counter_icmpv4);
if (len < ICMPV4_HEADER_LEN) {
ENGINE_SET_INVALID_EVENT(p, ICMPV4_PKT_TOO_SMALL);
return TM_ECODE_FAILED;
}
p->icmpv4h = (ICMPV4Hdr *)pkt;
SCLogDebug("ICMPV4 TYPE %" PRIu32 " CODE %" PRIu32 "", p->icmpv4h->type, p->icmpv4h->code);
p->proto = IPPROTO_ICMP;
p->type = p->icmpv4h->type;
p->code = p->icmpv4h->code;
p->payload = pkt + ICMPV4_HEADER_LEN;
p->payload_len = len - ICMPV4_HEADER_LEN;
ICMPV4ExtHdr* icmp4eh = (ICMPV4ExtHdr*) p->icmpv4h;
switch (p->icmpv4h->type)
{
case ICMP_ECHOREPLY:
p->icmpv4vars.id=icmp4eh->id;
p->icmpv4vars.seq=icmp4eh->seq;
if (p->icmpv4h->code!=0) {
ENGINE_SET_EVENT(p,ICMPV4_UNKNOWN_CODE);
}
break;
case ICMP_DEST_UNREACH:
if (p->icmpv4h->code > NR_ICMP_UNREACH) {
ENGINE_SET_EVENT(p,ICMPV4_UNKNOWN_CODE);
} else {
/* parse IP header plus 64 bytes */
if (len > ICMPV4_HEADER_PKT_OFFSET) {
if (DecodePartialIPV4(p, (uint8_t *)(pkt + ICMPV4_HEADER_PKT_OFFSET),
len - ICMPV4_HEADER_PKT_OFFSET ) == 0)
{
/* ICMP ICMP_DEST_UNREACH influence TCP/UDP flows */
if (ICMPV4_DEST_UNREACH_IS_VALID(p)) {
FlowHandlePacket(tv, dtv, p);
}
}
}
}
break;
case ICMP_SOURCE_QUENCH:
if (p->icmpv4h->code!=0) {
ENGINE_SET_EVENT(p,ICMPV4_UNKNOWN_CODE);
} else {
// parse IP header plus 64 bytes
if (len >= ICMPV4_HEADER_PKT_OFFSET)
DecodePartialIPV4( p, (uint8_t*) (pkt + ICMPV4_HEADER_PKT_OFFSET), len - ICMPV4_HEADER_PKT_OFFSET );
}
break;
case ICMP_REDIRECT:
if (p->icmpv4h->code>ICMP_REDIR_HOSTTOS) {
ENGINE_SET_EVENT(p,ICMPV4_UNKNOWN_CODE);
} else {
// parse IP header plus 64 bytes
if (len > ICMPV4_HEADER_PKT_OFFSET)
DecodePartialIPV4( p, (uint8_t*) (pkt + ICMPV4_HEADER_PKT_OFFSET), len - ICMPV4_HEADER_PKT_OFFSET );
}
break;
case ICMP_ECHO:
p->icmpv4vars.id=icmp4eh->id;
p->icmpv4vars.seq=icmp4eh->seq;
if (p->icmpv4h->code!=0) {
ENGINE_SET_EVENT(p,ICMPV4_UNKNOWN_CODE);
}
break;
case ICMP_TIME_EXCEEDED:
if (p->icmpv4h->code>ICMP_EXC_FRAGTIME) {
ENGINE_SET_EVENT(p,ICMPV4_UNKNOWN_CODE);
} else {
// parse IP header plus 64 bytes
if (len > ICMPV4_HEADER_PKT_OFFSET)
DecodePartialIPV4( p, (uint8_t*) (pkt + ICMPV4_HEADER_PKT_OFFSET), len - ICMPV4_HEADER_PKT_OFFSET );
}
break;
case ICMP_PARAMETERPROB:
if (p->icmpv4h->code!=0) {
ENGINE_SET_EVENT(p,ICMPV4_UNKNOWN_CODE);
} else {
// parse IP header plus 64 bytes
if (len > ICMPV4_HEADER_PKT_OFFSET)
DecodePartialIPV4( p, (uint8_t*) (pkt + ICMPV4_HEADER_PKT_OFFSET), len - ICMPV4_HEADER_PKT_OFFSET );
}
break;
case ICMP_TIMESTAMP:
p->icmpv4vars.id=icmp4eh->id;
p->icmpv4vars.seq=icmp4eh->seq;
if (p->icmpv4h->code!=0) {
ENGINE_SET_EVENT(p,ICMPV4_UNKNOWN_CODE);
}
break;
case ICMP_TIMESTAMPREPLY:
p->icmpv4vars.id=icmp4eh->id;
p->icmpv4vars.seq=icmp4eh->seq;
if (p->icmpv4h->code!=0) {
ENGINE_SET_EVENT(p,ICMPV4_UNKNOWN_CODE);
}
break;
case ICMP_INFO_REQUEST:
p->icmpv4vars.id=icmp4eh->id;
p->icmpv4vars.seq=icmp4eh->seq;
if (p->icmpv4h->code!=0) {
ENGINE_SET_EVENT(p,ICMPV4_UNKNOWN_CODE);
}
break;
case ICMP_INFO_REPLY:
p->icmpv4vars.id=icmp4eh->id;
p->icmpv4vars.seq=icmp4eh->seq;
if (p->icmpv4h->code!=0) {
ENGINE_SET_EVENT(p,ICMPV4_UNKNOWN_CODE);
}
break;
case ICMP_ADDRESS:
p->icmpv4vars.id=icmp4eh->id;
p->icmpv4vars.seq=icmp4eh->seq;
if (p->icmpv4h->code!=0) {
ENGINE_SET_EVENT(p,ICMPV4_UNKNOWN_CODE);
}
break;
case ICMP_ADDRESSREPLY:
p->icmpv4vars.id=icmp4eh->id;
p->icmpv4vars.seq=icmp4eh->seq;
if (p->icmpv4h->code!=0) {
ENGINE_SET_EVENT(p,ICMPV4_UNKNOWN_CODE);
}
break;
default:
ENGINE_SET_EVENT(p,ICMPV4_UNKNOWN_TYPE);
}
return TM_ECODE_OK;
}
int DecodeGRE(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, uint8_t *pkt, uint16_t len, PacketQueue *pq)
{
uint16_t header_len = GRE_HDR_LEN;
GRESreHdr *gsre = NULL;
StatsIncr(tv, dtv->counter_gre);
if(len < GRE_HDR_LEN) {
ENGINE_SET_INVALID_EVENT(p, GRE_PKT_TOO_SMALL);
return TM_ECODE_FAILED;
}
p->greh = (GREHdr *)pkt;
if(p->greh == NULL)
return TM_ECODE_FAILED;
SCLogDebug("p %p pkt %p GRE protocol %04x Len: %d GRE version %x",
p, pkt, GRE_GET_PROTO(p->greh), len,GRE_GET_VERSION(p->greh));
switch (GRE_GET_VERSION(p->greh))
{
case GRE_VERSION_0:
/* GRE version 0 doenst support the fields below RFC 1701 */
/**
* \todo We need to make sure this does not allow bypassing
* inspection. A server may just ignore these and
* continue processing the packet, but we will not look
* further into it.
*/
if (GRE_FLAG_ISSET_RECUR(p->greh)) {
ENGINE_SET_INVALID_EVENT(p, GRE_VERSION0_RECUR);
return TM_ECODE_OK;
}
if (GREV1_FLAG_ISSET_FLAGS(p->greh)) {
ENGINE_SET_INVALID_EVENT(p, GRE_VERSION0_FLAGS);
return TM_ECODE_OK;
}
/* Adjust header length based on content */
if (GRE_FLAG_ISSET_KY(p->greh))
header_len += GRE_KEY_LEN;
if (GRE_FLAG_ISSET_SQ(p->greh))
header_len += GRE_SEQ_LEN;
if (GRE_FLAG_ISSET_CHKSUM(p->greh) || GRE_FLAG_ISSET_ROUTE(p->greh))
header_len += GRE_CHKSUM_LEN + GRE_OFFSET_LEN;
if (header_len > len) {
ENGINE_SET_INVALID_EVENT(p, GRE_VERSION0_HDR_TOO_BIG);
return TM_ECODE_OK;
}
if (GRE_FLAG_ISSET_ROUTE(p->greh))
{
while (1)
{
if ((header_len + GRE_SRE_HDR_LEN) > len) {
ENGINE_SET_INVALID_EVENT(p,
GRE_VERSION0_MALFORMED_SRE_HDR);
return TM_ECODE_OK;
}
gsre = (GRESreHdr *)(pkt + header_len);
header_len += GRE_SRE_HDR_LEN;
if ((ntohs(gsre->af) == 0) && (gsre->sre_length == 0))
break;
header_len += gsre->sre_length;
if (header_len > len) {
ENGINE_SET_INVALID_EVENT(p,
GRE_VERSION0_MALFORMED_SRE_HDR);
return TM_ECODE_OK;
}
}
}
break;
case GRE_VERSION_1:
/* GRE version 1 doenst support the fields below RFC 1701 */
/**
* \todo We need to make sure this does not allow bypassing
* inspection. A server may just ignore these and
* continue processing the packet, but we will not look
* further into it.
*/
if (GRE_FLAG_ISSET_CHKSUM(p->greh)) {
ENGINE_SET_INVALID_EVENT(p,GRE_VERSION1_CHKSUM);
return TM_ECODE_OK;
}
if (GRE_FLAG_ISSET_ROUTE(p->greh)) {
ENGINE_SET_INVALID_EVENT(p,GRE_VERSION1_ROUTE);
return TM_ECODE_OK;
}
if (GRE_FLAG_ISSET_SSR(p->greh)) {
ENGINE_SET_INVALID_EVENT(p,GRE_VERSION1_SSR);
return TM_ECODE_OK;
}
if (GRE_FLAG_ISSET_RECUR(p->greh)) {
ENGINE_SET_INVALID_EVENT(p,GRE_VERSION1_RECUR);
return TM_ECODE_OK;
}
if (GREV1_FLAG_ISSET_FLAGS(p->greh)) {
ENGINE_SET_INVALID_EVENT(p,GRE_VERSION1_FLAGS);
return TM_ECODE_OK;
}
if (GRE_GET_PROTO(p->greh) != GRE_PROTO_PPP) {
ENGINE_SET_INVALID_EVENT(p,GRE_VERSION1_WRONG_PROTOCOL);
return TM_ECODE_OK;
}
if (!(GRE_FLAG_ISSET_KY(p->greh))) {
ENGINE_SET_INVALID_EVENT(p,GRE_VERSION1_NO_KEY);
return TM_ECODE_OK;
}
header_len += GRE_KEY_LEN;
/* Adjust header length based on content */
if (GRE_FLAG_ISSET_SQ(p->greh))
header_len += GRE_SEQ_LEN;
if (GREV1_FLAG_ISSET_ACK(p->greh))
header_len += GREV1_ACK_LEN;
if (header_len > len) {
ENGINE_SET_INVALID_EVENT(p, GRE_VERSION1_HDR_TOO_BIG);
return TM_ECODE_OK;
}
break;
default:
ENGINE_SET_INVALID_EVENT(p, GRE_WRONG_VERSION);
return TM_ECODE_OK;
}
switch (GRE_GET_PROTO(p->greh))
{
case ETHERNET_TYPE_IP:
{
if (pq != NULL) {
Packet *tp = PacketTunnelPktSetup(tv, dtv, p, pkt + header_len,
len - header_len, DECODE_TUNNEL_IPV4, pq);
if (tp != NULL) {
PKT_SET_SRC(tp, PKT_SRC_DECODER_GRE);
PacketEnqueue(pq,tp);
}
}
break;
}
case GRE_PROTO_PPP:
{
if (pq != NULL) {
Packet *tp = PacketTunnelPktSetup(tv, dtv, p, pkt + header_len,
len - header_len, DECODE_TUNNEL_PPP, pq);
if (tp != NULL) {
PKT_SET_SRC(tp, PKT_SRC_DECODER_GRE);
PacketEnqueue(pq,tp);
}
}
break;
}
case ETHERNET_TYPE_IPV6:
{
if (pq != NULL) {
Packet *tp = PacketTunnelPktSetup(tv, dtv, p, pkt + header_len,
len - header_len, DECODE_TUNNEL_IPV6, pq);
if (tp != NULL) {
PKT_SET_SRC(tp, PKT_SRC_DECODER_GRE);
PacketEnqueue(pq,tp);
}
}
break;
}
case ETHERNET_TYPE_VLAN:
{
if (pq != NULL) {
Packet *tp = PacketTunnelPktSetup(tv, dtv, p, pkt + header_len,
len - header_len, DECODE_TUNNEL_VLAN, pq);
if (tp != NULL) {
PKT_SET_SRC(tp, PKT_SRC_DECODER_GRE);
PacketEnqueue(pq,tp);
}
}
break;
}
case ETHERNET_TYPE_ERSPAN:
{
if (pq != NULL) {
Packet *tp = PacketTunnelPktSetup(tv, dtv, p, pkt + header_len,
len - header_len, DECODE_TUNNEL_ERSPAN, pq);
if (tp != NULL) {
PKT_SET_SRC(tp, PKT_SRC_DECODER_GRE);
PacketEnqueue(pq,tp);
}
}
break;
}
case ETHERNET_TYPE_BRIDGE:
{
if (pq != NULL) {
Packet *tp = PacketTunnelPktSetup(tv, dtv, p, pkt + header_len,
len - header_len, DECODE_TUNNEL_ETHERNET, pq);
if (tp != NULL) {
PKT_SET_SRC(tp, PKT_SRC_DECODER_GRE);
PacketEnqueue(pq,tp);
}
}
break;
}
default:
return TM_ECODE_OK;
}
return TM_ECODE_OK;
}
static int DecodeTCPOptions(Packet *p, uint8_t *pkt, uint16_t len)
{
uint8_t tcp_opt_cnt = 0;
TCPOpt tcp_opts[TCP_OPTMAX];
uint16_t plen = len;
while (plen)
{
/* single byte options */
if (*pkt == TCP_OPT_EOL) {
break;
} else if (*pkt == TCP_OPT_NOP) {
pkt++;
plen--;
/* multibyte options */
} else {
if (plen < 2) {
break;
}
/* we already know that the total options len is valid,
* so here the len of the specific option must be bad.
* Also check for invalid lengths 0 and 1. */
if (unlikely(*(pkt+1) > plen || *(pkt+1) < 2)) {
ENGINE_SET_INVALID_EVENT(p, TCP_OPT_INVALID_LEN);
return -1;
}
tcp_opts[tcp_opt_cnt].type = *pkt;
tcp_opts[tcp_opt_cnt].len = *(pkt+1);
if (plen > 2)
tcp_opts[tcp_opt_cnt].data = (pkt+2);
else
tcp_opts[tcp_opt_cnt].data = NULL;
/* we are parsing the most commonly used opts to prevent
* us from having to walk the opts list for these all the
* time. */
switch (tcp_opts[tcp_opt_cnt].type) {
case TCP_OPT_WS:
if (tcp_opts[tcp_opt_cnt].len != TCP_OPT_WS_LEN) {
ENGINE_SET_EVENT(p,TCP_OPT_INVALID_LEN);
} else {
if (p->tcpvars.ws.type != 0) {
ENGINE_SET_EVENT(p,TCP_OPT_DUPLICATE);
} else {
SET_OPTS(p->tcpvars.ws, tcp_opts[tcp_opt_cnt]);
}
}
break;
case TCP_OPT_MSS:
if (tcp_opts[tcp_opt_cnt].len != TCP_OPT_MSS_LEN) {
ENGINE_SET_EVENT(p,TCP_OPT_INVALID_LEN);
} else {
if (p->tcpvars.mss.type != 0) {
ENGINE_SET_EVENT(p,TCP_OPT_DUPLICATE);
} else {
SET_OPTS(p->tcpvars.mss, tcp_opts[tcp_opt_cnt]);
}
}
break;
case TCP_OPT_SACKOK:
if (tcp_opts[tcp_opt_cnt].len != TCP_OPT_SACKOK_LEN) {
ENGINE_SET_EVENT(p,TCP_OPT_INVALID_LEN);
} else {
if (p->tcpvars.sackok.type != 0) {
ENGINE_SET_EVENT(p,TCP_OPT_DUPLICATE);
} else {
SET_OPTS(p->tcpvars.sackok, tcp_opts[tcp_opt_cnt]);
}
}
break;
case TCP_OPT_TS:
if (tcp_opts[tcp_opt_cnt].len != TCP_OPT_TS_LEN) {
ENGINE_SET_EVENT(p,TCP_OPT_INVALID_LEN);
} else {
if (p->tcpvars.ts_set) {
ENGINE_SET_EVENT(p,TCP_OPT_DUPLICATE);
} else {
uint32_t values[2];
memcpy(&values, tcp_opts[tcp_opt_cnt].data, sizeof(values));
p->tcpvars.ts_val = ntohl(values[0]);
p->tcpvars.ts_ecr = ntohl(values[1]);
p->tcpvars.ts_set = TRUE;
}
}
break;
case TCP_OPT_SACK:
SCLogDebug("SACK option, len %u", tcp_opts[tcp_opt_cnt].len);
if (tcp_opts[tcp_opt_cnt].len < TCP_OPT_SACK_MIN_LEN ||
tcp_opts[tcp_opt_cnt].len > TCP_OPT_SACK_MAX_LEN ||
!((tcp_opts[tcp_opt_cnt].len - 2) % 8 == 0))
{
ENGINE_SET_EVENT(p,TCP_OPT_INVALID_LEN);
} else {
if (p->tcpvars.sack.type != 0) {
ENGINE_SET_EVENT(p,TCP_OPT_DUPLICATE);
} else {
SET_OPTS(p->tcpvars.sack, tcp_opts[tcp_opt_cnt]);
}
}
break;
}
pkt += tcp_opts[tcp_opt_cnt].len;
plen -= (tcp_opts[tcp_opt_cnt].len);
tcp_opt_cnt++;
}
}
return 0;
}
/**
* \brief Main decoding function for PPPOE Discovery packets
*/
int DecodePPPOEDiscovery(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, uint8_t *pkt, uint16_t len, PacketQueue *pq)
{
SCPerfCounterIncr(dtv->counter_pppoe, tv->sc_perf_pca);
if (len < PPPOE_DISCOVERY_HEADER_MIN_LEN) {
ENGINE_SET_INVALID_EVENT(p, PPPOE_PKT_TOO_SMALL);
return TM_ECODE_FAILED;
}
p->pppoedh = (PPPOEDiscoveryHdr *)pkt;
if (p->pppoedh == NULL)
return TM_ECODE_FAILED;
/* parse the PPPOE code */
switch (p->pppoedh->pppoe_code)
{
case PPPOE_CODE_PADI:
break;
case PPPOE_CODE_PADO:
break;
case PPPOE_CODE_PADR:
break;
case PPPOE_CODE_PADS:
break;
case PPPOE_CODE_PADT:
break;
default:
SCLogDebug("unknown PPPOE code: 0x%0"PRIX8"", p->pppoedh->pppoe_code);
ENGINE_SET_INVALID_EVENT(p, PPPOE_WRONG_CODE);
return TM_ECODE_OK;
}
/* parse any tags we have in the packet */
uint16_t tag_length = 0;
PPPOEDiscoveryTag* pppoedt = (PPPOEDiscoveryTag*) (p->pppoedh + PPPOE_DISCOVERY_HEADER_MIN_LEN);
uint16_t pppoe_length = ntohs(p->pppoedh->pppoe_length);
uint16_t packet_length = len - PPPOE_DISCOVERY_HEADER_MIN_LEN ;
SCLogDebug("pppoe_length %"PRIu16", packet_length %"PRIu16"",
pppoe_length, packet_length);
if (pppoe_length > packet_length) {
SCLogDebug("malformed PPPOE tags");
ENGINE_SET_INVALID_EVENT(p, PPPOE_MALFORMED_TAGS);
return TM_ECODE_OK;
}
while (pppoedt < (PPPOEDiscoveryTag*) (pkt + (len - sizeof(PPPOEDiscoveryTag))) && pppoe_length >=4 && packet_length >=4)
{
#ifdef DEBUG
uint16_t tag_type = ntohs(pppoedt->pppoe_tag_type);
#endif
tag_length = ntohs(pppoedt->pppoe_tag_length);
SCLogDebug ("PPPoE Tag type %x, length %u", tag_type, tag_length);
if (pppoe_length >= (4 + tag_length)) {
pppoe_length -= (4 + tag_length);
} else {
pppoe_length = 0; // don't want an underflow
}
if (packet_length >= 4 + tag_length) {
packet_length -= (4 + tag_length);
} else {
packet_length = 0; // don't want an underflow
}
pppoedt = pppoedt + (4 + tag_length);
}
return TM_ECODE_OK;
}
/**
* \brief Main decoding function for PPPOE Session packets
*/
int DecodePPPOESession(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, uint8_t *pkt, uint16_t len, PacketQueue *pq)
{
SCPerfCounterIncr(dtv->counter_pppoe, tv->sc_perf_pca);
if (len < PPPOE_SESSION_HEADER_LEN) {
ENGINE_SET_INVALID_EVENT(p, PPPOE_PKT_TOO_SMALL);
return TM_ECODE_FAILED;
}
p->pppoesh = (PPPOESessionHdr *)pkt;
if (p->pppoesh == NULL)
return TM_ECODE_FAILED;
SCLogDebug("PPPOE VERSION %" PRIu32 " TYPE %" PRIu32 " CODE %" PRIu32 " SESSIONID %" PRIu32 " LENGTH %" PRIu32 "",
PPPOE_SESSION_GET_VERSION(p->pppoesh), PPPOE_SESSION_GET_TYPE(p->pppoesh), p->pppoesh->pppoe_code, ntohs(p->pppoesh->session_id), ntohs(p->pppoesh->pppoe_length));
/* can't use DecodePPP() here because we only get a single 2-byte word to indicate protocol instead of the full PPP header */
if (ntohs(p->pppoesh->pppoe_length) > 0) {
/* decode contained PPP packet */
switch (ntohs(p->pppoesh->protocol))
{
case PPP_VJ_COMP:
case PPP_IPX:
case PPP_OSI:
case PPP_NS:
case PPP_DECNET:
case PPP_APPLE:
case PPP_BRPDU:
case PPP_STII:
case PPP_VINES:
case PPP_HELLO:
case PPP_LUXCOM:
case PPP_SNS:
case PPP_MPLS_UCAST:
case PPP_MPLS_MCAST:
case PPP_IPCP:
case PPP_OSICP:
case PPP_NSCP:
case PPP_DECNETCP:
case PPP_APPLECP:
case PPP_IPXCP:
case PPP_STIICP:
case PPP_VINESCP:
case PPP_IPV6CP:
case PPP_MPLSCP:
case PPP_LCP:
case PPP_PAP:
case PPP_LQM:
case PPP_CHAP:
ENGINE_SET_EVENT(p,PPP_UNSUP_PROTO);
break;
case PPP_VJ_UCOMP:
if(len < (PPPOE_SESSION_HEADER_LEN + IPV4_HEADER_LEN)) {
ENGINE_SET_INVALID_EVENT(p, PPPVJU_PKT_TOO_SMALL);
return TM_ECODE_OK;
}
if(IPV4_GET_RAW_VER((IPV4Hdr *)(pkt + PPPOE_SESSION_HEADER_LEN)) == 4) {
DecodeIPV4(tv, dtv, p, pkt + PPPOE_SESSION_HEADER_LEN, len - PPPOE_SESSION_HEADER_LEN, pq );
}
break;
case PPP_IP:
if(len < (PPPOE_SESSION_HEADER_LEN + IPV4_HEADER_LEN)) {
ENGINE_SET_INVALID_EVENT(p, PPPIPV4_PKT_TOO_SMALL);
return TM_ECODE_OK;
}
DecodeIPV4(tv, dtv, p, pkt + PPPOE_SESSION_HEADER_LEN, len - PPPOE_SESSION_HEADER_LEN, pq );
break;
/* PPP IPv6 was not tested */
case PPP_IPV6:
if(len < (PPPOE_SESSION_HEADER_LEN + IPV6_HEADER_LEN)) {
ENGINE_SET_INVALID_EVENT(p, PPPIPV6_PKT_TOO_SMALL);
return TM_ECODE_OK;
}
DecodeIPV6(tv, dtv, p, pkt + PPPOE_SESSION_HEADER_LEN, len - PPPOE_SESSION_HEADER_LEN, pq );
break;
default:
SCLogDebug("unknown PPP protocol: %" PRIx32 "",ntohs(p->ppph->protocol));
ENGINE_SET_INVALID_EVENT(p, PPP_WRONG_TYPE);
return TM_ECODE_OK;
}
}
return TM_ECODE_OK;
}
static int DecodeTCPOptions(Packet *p, uint8_t *pkt, uint16_t len)
{
uint16_t plen = len;
while (plen)
{
/* single byte options */
if (*pkt == TCP_OPT_EOL) {
break;
} else if (*pkt == TCP_OPT_NOP) {
pkt++;
plen--;
/* multibyte options */
} else {
if (plen < 2) {
break;
}
/* we already know that the total options len is valid,
* so here the len of the specific option must be bad.
* Also check for invalid lengths 0 and 1. */
if (unlikely(*(pkt+1) > plen || *(pkt+1) < 2)) {
ENGINE_SET_INVALID_EVENT(p, TCP_OPT_INVALID_LEN);
return -1;
}
p->TCP_OPTS[p->TCP_OPTS_CNT].type = *pkt;
p->TCP_OPTS[p->TCP_OPTS_CNT].len = *(pkt+1);
if (plen > 2)
p->TCP_OPTS[p->TCP_OPTS_CNT].data = (pkt+2);
else
p->TCP_OPTS[p->TCP_OPTS_CNT].data = NULL;
/* we are parsing the most commonly used opts to prevent
* us from having to walk the opts list for these all the
* time. */
switch (p->TCP_OPTS[p->TCP_OPTS_CNT].type) {
case TCP_OPT_WS:
if (p->TCP_OPTS[p->TCP_OPTS_CNT].len != TCP_OPT_WS_LEN) {
ENGINE_SET_EVENT(p,TCP_OPT_INVALID_LEN);
} else {
if (p->tcpvars.ws != NULL) {
ENGINE_SET_EVENT(p,TCP_OPT_DUPLICATE);
} else {
p->tcpvars.ws = &p->TCP_OPTS[p->TCP_OPTS_CNT];
}
}
break;
case TCP_OPT_MSS:
if (p->TCP_OPTS[p->TCP_OPTS_CNT].len != TCP_OPT_MSS_LEN) {
ENGINE_SET_EVENT(p,TCP_OPT_INVALID_LEN);
} else {
if (p->tcpvars.mss != NULL) {
ENGINE_SET_EVENT(p,TCP_OPT_DUPLICATE);
} else {
p->tcpvars.mss = &p->TCP_OPTS[p->TCP_OPTS_CNT];
}
}
break;
case TCP_OPT_SACKOK:
if (p->TCP_OPTS[p->TCP_OPTS_CNT].len != TCP_OPT_SACKOK_LEN) {
ENGINE_SET_EVENT(p,TCP_OPT_INVALID_LEN);
} else {
if (p->tcpvars.sackok != NULL) {
ENGINE_SET_EVENT(p,TCP_OPT_DUPLICATE);
} else {
p->tcpvars.sackok = &p->TCP_OPTS[p->TCP_OPTS_CNT];
}
}
break;
case TCP_OPT_TS:
if (p->TCP_OPTS[p->TCP_OPTS_CNT].len != TCP_OPT_TS_LEN) {
ENGINE_SET_EVENT(p,TCP_OPT_INVALID_LEN);
} else {
if (p->tcpvars.ts != NULL) {
ENGINE_SET_EVENT(p,TCP_OPT_DUPLICATE);
} else {
p->tcpvars.ts = &p->TCP_OPTS[p->TCP_OPTS_CNT];
}
}
break;
case TCP_OPT_SACK:
SCLogDebug("SACK option, len %u", p->TCP_OPTS[p->TCP_OPTS_CNT].len);
if (p->TCP_OPTS[p->TCP_OPTS_CNT].len < TCP_OPT_SACK_MIN_LEN ||
p->TCP_OPTS[p->TCP_OPTS_CNT].len > TCP_OPT_SACK_MAX_LEN ||
!((p->TCP_OPTS[p->TCP_OPTS_CNT].len - 2) % 8 == 0))
{
ENGINE_SET_EVENT(p,TCP_OPT_INVALID_LEN);
} else {
if (p->tcpvars.sack != NULL) {
ENGINE_SET_EVENT(p,TCP_OPT_DUPLICATE);
} else {
p->tcpvars.sack = &p->TCP_OPTS[p->TCP_OPTS_CNT];
}
}
break;
}
pkt += p->TCP_OPTS[p->TCP_OPTS_CNT].len;
plen -= (p->TCP_OPTS[p->TCP_OPTS_CNT].len);
p->TCP_OPTS_CNT++;
}
}
return 0;
}
int DecodeMPLS(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, uint8_t *pkt,
uint16_t len, PacketQueue *pq)
{
uint32_t shim;
int label;
int event = 0;
StatsIncr(tv, dtv->counter_mpls);
do {
if (len < MPLS_HEADER_LEN) {
ENGINE_SET_INVALID_EVENT(p, MPLS_HEADER_TOO_SMALL);
return TM_ECODE_FAILED;
}
shim = *(uint32_t *)pkt;
pkt += MPLS_HEADER_LEN;
len -= MPLS_HEADER_LEN;
} while (MPLS_BOTTOM(shim) == 0);
label = MPLS_LABEL(shim);
if (label == MPLS_LABEL_IPV4) {
return DecodeIPV4(tv, dtv, p, pkt, len, pq);
}
else if (label == MPLS_LABEL_ROUTER_ALERT) {
/* Not valid at the bottom of the stack. */
event = MPLS_BAD_LABEL_ROUTER_ALERT;
}
else if (label == MPLS_LABEL_IPV6) {
return DecodeIPV6(tv, dtv, p, pkt, len, pq);
}
else if (label == MPLS_LABEL_NULL) {
/* Shouldn't appear on the wire. */
event = MPLS_BAD_LABEL_IMPLICIT_NULL;
}
else if (label < MPLS_MAX_RESERVED_LABEL) {
event = MPLS_BAD_LABEL_RESERVED;
}
if (event) {
goto end;
}
/* Best guess at inner packet. */
switch (pkt[0] >> 4) {
case MPLS_PROTO_IPV4:
DecodeIPV4(tv, dtv, p, pkt, len, pq);
break;
case MPLS_PROTO_IPV6:
DecodeIPV6(tv, dtv, p, pkt, len, pq);
break;
case MPLS_PROTO_ETHERNET_PW:
DecodeEthernet(tv, dtv, p, pkt + MPLS_PW_LEN, len - MPLS_PW_LEN,
pq);
break;
default:
ENGINE_SET_INVALID_EVENT(p, MPLS_UNKNOWN_PAYLOAD_TYPE);
return TM_ECODE_OK;
}
end:
if (event) {
ENGINE_SET_EVENT(p, event);
}
return TM_ECODE_OK;
}
int DecodePPP(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, uint8_t *pkt, uint16_t len, PacketQueue *pq)
{
StatsIncr(tv, dtv->counter_ppp);
if (unlikely(len < PPP_HEADER_LEN)) {
ENGINE_SET_INVALID_EVENT(p, PPP_PKT_TOO_SMALL);
return TM_ECODE_FAILED;
}
p->ppph = (PPPHdr *)pkt;
if (unlikely(p->ppph == NULL))
return TM_ECODE_FAILED;
SCLogDebug("p %p pkt %p PPP protocol %04x Len: %" PRId32 "",
p, pkt, ntohs(p->ppph->protocol), len);
switch (ntohs(p->ppph->protocol))
{
case PPP_VJ_UCOMP:
if (unlikely(len < (PPP_HEADER_LEN + IPV4_HEADER_LEN))) {
ENGINE_SET_INVALID_EVENT(p,PPPVJU_PKT_TOO_SMALL);
p->ppph = NULL;
return TM_ECODE_FAILED;
}
if (likely(IPV4_GET_RAW_VER((IPV4Hdr *)(pkt + PPP_HEADER_LEN)) == 4)) {
return DecodeIPV4(tv, dtv, p, pkt + PPP_HEADER_LEN, len - PPP_HEADER_LEN, pq);
} else
return TM_ECODE_FAILED;
break;
case PPP_IP:
if (unlikely(len < (PPP_HEADER_LEN + IPV4_HEADER_LEN))) {
ENGINE_SET_INVALID_EVENT(p,PPPIPV4_PKT_TOO_SMALL);
p->ppph = NULL;
return TM_ECODE_FAILED;
}
return DecodeIPV4(tv, dtv, p, pkt + PPP_HEADER_LEN, len - PPP_HEADER_LEN, pq);
/* PPP IPv6 was not tested */
case PPP_IPV6:
if (unlikely(len < (PPP_HEADER_LEN + IPV6_HEADER_LEN))) {
ENGINE_SET_INVALID_EVENT(p,PPPIPV6_PKT_TOO_SMALL);
p->ppph = NULL;
return TM_ECODE_FAILED;
}
return DecodeIPV6(tv, dtv, p, pkt + PPP_HEADER_LEN, len - PPP_HEADER_LEN, pq);
case PPP_VJ_COMP:
case PPP_IPX:
case PPP_OSI:
case PPP_NS:
case PPP_DECNET:
case PPP_APPLE:
case PPP_BRPDU:
case PPP_STII:
case PPP_VINES:
case PPP_HELLO:
case PPP_LUXCOM:
case PPP_SNS:
case PPP_MPLS_UCAST:
case PPP_MPLS_MCAST:
case PPP_IPCP:
case PPP_OSICP:
case PPP_NSCP:
case PPP_DECNETCP:
case PPP_APPLECP:
case PPP_IPXCP:
case PPP_STIICP:
case PPP_VINESCP:
case PPP_IPV6CP:
case PPP_MPLSCP:
case PPP_LCP:
case PPP_PAP:
case PPP_LQM:
case PPP_CHAP:
ENGINE_SET_EVENT(p,PPP_UNSUP_PROTO);
return TM_ECODE_OK;
default:
SCLogDebug("unknown PPP protocol: %" PRIx32 "",ntohs(p->ppph->protocol));
ENGINE_SET_INVALID_EVENT(p, PPP_WRONG_TYPE);
return TM_ECODE_OK;
}
}
/**
* \internal
* \brief this function is used to decode IEEE802.1q packets
*
* \param tv pointer to the thread vars
* \param dtv pointer code thread vars
* \param p pointer to the packet struct
* \param pkt pointer to the raw packet
* \param len packet len
* \param pq pointer to the packet queue
*
*/
int DecodeVLAN(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, uint8_t *pkt, uint16_t len, PacketQueue *pq)
{
uint32_t proto;
SCPerfCounterIncr(dtv->counter_vlan, tv->sc_perf_pca);
if(len < VLAN_HEADER_LEN) {
ENGINE_SET_INVALID_EVENT(p, VLAN_HEADER_TOO_SMALL);
return TM_ECODE_FAILED;
}
if (p->vlan_idx >= 2) {
ENGINE_SET_EVENT(p,VLAN_HEADER_TOO_MANY_LAYERS);
return TM_ECODE_FAILED;
}
p->vlanh[p->vlan_idx] = (VLANHdr *)pkt;
if(p->vlanh[p->vlan_idx] == NULL)
return TM_ECODE_FAILED;
proto = GET_VLAN_PROTO(p->vlanh[p->vlan_idx]);
SCLogDebug("p %p pkt %p VLAN protocol %04x VLAN PRI %d VLAN CFI %d VLAN ID %d Len: %" PRId32 "",
p, pkt, proto, GET_VLAN_PRIORITY(p->vlanh[p->vlan_idx]),
GET_VLAN_CFI(p->vlanh[p->vlan_idx]), GET_VLAN_ID(p->vlanh[p->vlan_idx]), len);
/* only store the id for flow hashing if it's not disabled. */
if (dtv->vlan_disabled == 0)
p->vlan_id[p->vlan_idx] = (uint16_t)GET_VLAN_ID(p->vlanh[p->vlan_idx]);
p->vlan_idx++;
switch (proto) {
case ETHERNET_TYPE_IP:
DecodeIPV4(tv, dtv, p, pkt + VLAN_HEADER_LEN,
len - VLAN_HEADER_LEN, pq);
break;
case ETHERNET_TYPE_IPV6:
DecodeIPV6(tv, dtv, p, pkt + VLAN_HEADER_LEN,
len - VLAN_HEADER_LEN, pq);
break;
case ETHERNET_TYPE_PPPOE_SESS:
DecodePPPOESession(tv, dtv, p, pkt + VLAN_HEADER_LEN,
len - VLAN_HEADER_LEN, pq);
break;
case ETHERNET_TYPE_PPPOE_DISC:
DecodePPPOEDiscovery(tv, dtv, p, pkt + VLAN_HEADER_LEN,
len - VLAN_HEADER_LEN, pq);
break;
case ETHERNET_TYPE_VLAN:
if (p->vlan_idx >= 2) {
ENGINE_SET_EVENT(p,VLAN_HEADER_TOO_MANY_LAYERS);
return TM_ECODE_OK;
} else {
DecodeVLAN(tv, dtv, p, pkt + VLAN_HEADER_LEN,
len - VLAN_HEADER_LEN, pq);
}
break;
default:
SCLogDebug("unknown VLAN type: %" PRIx32 "", proto);
ENGINE_SET_INVALID_EVENT(p, VLAN_UNKNOWN_TYPE);
return TM_ECODE_OK;
}
return TM_ECODE_OK;
}
int DecodeMPLS(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, uint8_t *pkt,
uint32_t len, PacketQueue *pq)
{
uint32_t shim;
int label;
int event = 0;
StatsIncr(tv, dtv->counter_mpls);
do {
if (len < MPLS_HEADER_LEN) {
ENGINE_SET_INVALID_EVENT(p, MPLS_HEADER_TOO_SMALL);
return TM_ECODE_FAILED;
}
memcpy(&shim, pkt, sizeof(shim));
pkt += MPLS_HEADER_LEN;
len -= MPLS_HEADER_LEN;
} while (MPLS_BOTTOM(shim) == 0);
label = MPLS_LABEL(shim);
if (label == MPLS_LABEL_IPV4) {
if (len > USHRT_MAX) {
return TM_ECODE_FAILED;
}
return DecodeIPV4(tv, dtv, p, pkt, len, pq);
}
else if (label == MPLS_LABEL_ROUTER_ALERT) {
/* Not valid at the bottom of the stack. */
event = MPLS_BAD_LABEL_ROUTER_ALERT;
}
else if (label == MPLS_LABEL_IPV6) {
if (len > USHRT_MAX) {
return TM_ECODE_FAILED;
}
return DecodeIPV6(tv, dtv, p, pkt, len, pq);
}
else if (label == MPLS_LABEL_NULL) {
/* Shouldn't appear on the wire. */
event = MPLS_BAD_LABEL_IMPLICIT_NULL;
}
else if (label < MPLS_MAX_RESERVED_LABEL) {
event = MPLS_BAD_LABEL_RESERVED;
}
if (event) {
goto end;
}
// Make sure we still have enough data. While we only need 1 byte to test
// for IPv4 and IPv4, we need for to check for ethernet.
if (len < MPLS_PW_LEN) {
ENGINE_SET_INVALID_EVENT(p, MPLS_PKT_TOO_SMALL);
return TM_ECODE_FAILED;
}
/* Best guess at inner packet. */
switch (pkt[0] >> 4) {
case MPLS_PROTO_IPV4:
if (len > USHRT_MAX) {
return TM_ECODE_FAILED;
}
DecodeIPV4(tv, dtv, p, pkt, len, pq);
break;
case MPLS_PROTO_IPV6:
if (len > USHRT_MAX) {
return TM_ECODE_FAILED;
}
DecodeIPV6(tv, dtv, p, pkt, len, pq);
break;
case MPLS_PROTO_ETHERNET_PW:
DecodeEthernet(tv, dtv, p, pkt + MPLS_PW_LEN, len - MPLS_PW_LEN,
pq);
break;
default:
ENGINE_SET_INVALID_EVENT(p, MPLS_UNKNOWN_PAYLOAD_TYPE);
return TM_ECODE_OK;
}
end:
if (event) {
ENGINE_SET_EVENT(p, event);
}
return TM_ECODE_OK;
}
