diff options
Diffstat (limited to 'framework/src/suricata/src/decode-gre.c')
-rw-r--r-- | framework/src/suricata/src/decode-gre.c | 400 |
1 files changed, 0 insertions, 400 deletions
diff --git a/framework/src/suricata/src/decode-gre.c b/framework/src/suricata/src/decode-gre.c deleted file mode 100644 index 6ad9e397..00000000 --- a/framework/src/suricata/src/decode-gre.c +++ /dev/null @@ -1,400 +0,0 @@ -/* Copyright (C) 2007-2013 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. - */ - -/** - * \ingroup decode - * - * @{ - */ - - -/** - * \file - * - * \author Breno Silva <breno.silva@gmail.com> - * - * Decodes GRE - */ - -#include "suricata-common.h" -#include "suricata.h" -#include "decode.h" -#include "decode-events.h" -#include "decode-gre.h" - -#include "util-unittest.h" -#include "util-debug.h" - -/** - * \brief Function to decode GRE packets - */ - -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; - } - - default: - return TM_ECODE_OK; - } - return TM_ECODE_OK; -} - - -#ifdef UNITTESTS -/** - * \test DecodeGRETest01 is a test for small gre packet - */ - -static int DecodeGREtest01 (void) -{ - - uint8_t raw_gre[] = { 0x00 ,0x6e ,0x62 }; - Packet *p = PacketGetFromAlloc(); - if (unlikely(p == NULL)) - return 0; - ThreadVars tv; - DecodeThreadVars dtv; - - memset(&tv, 0, sizeof(ThreadVars)); - memset(&dtv, 0, sizeof(DecodeThreadVars)); - - DecodeGRE(&tv, &dtv, p, raw_gre, sizeof(raw_gre), NULL); - - if(ENGINE_ISSET_EVENT(p,GRE_PKT_TOO_SMALL)) { - SCFree(p); - return 1; - } - - SCFree(p); - return 0; -} - -/** - * \test DecodeGRETest02 is a test for wrong gre version - */ - -static int DecodeGREtest02 (void) -{ - uint8_t raw_gre[] = { - 0x00, 0x6e, 0x62, 0xac, 0x40, 0x00, 0x40, 0x2f, - 0xc2, 0xc7, 0x0a, 0x00, 0x00, 0x64, 0x0a, 0x00, - 0x00, 0x8a, 0x30, 0x01, 0x0b, 0x00, 0x4e, 0x00, - 0x00, 0x00, 0x18, 0x4a, 0x50, 0xff, 0x03, 0x00, - 0x21, 0x45, 0x00, 0x00, 0x4a, 0x00, 0x00, 0x40, - 0x00, 0x40, 0x11, 0x94, 0x22, 0x50, 0x7e, 0x2b, - 0x2d, 0xc2, 0x6d, 0x68, 0x68, 0x80, 0x0e, 0x00, - 0x35, 0x00, 0x36, 0x9f, 0x18, 0xdb, 0xc4, 0x01, - 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, - 0x01, 0x03, 0x73, 0x31, 0x36, 0x09, 0x73, 0x69, - 0x74, 0x65, 0x6d, 0x65, 0x74, 0x65, 0x72, 0x03, - 0x63, 0x6f, 0x6d, 0x00, 0x00, 0x01, 0x00, 0x01, - 0x00, 0x00, 0x29, 0x10, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0x00 }; - Packet *p = PacketGetFromAlloc(); - if (unlikely(p == NULL)) - return 0; - ThreadVars tv; - DecodeThreadVars dtv; - - memset(&tv, 0, sizeof(ThreadVars)); - memset(&dtv, 0, sizeof(DecodeThreadVars)); - - DecodeGRE(&tv, &dtv, p, raw_gre, sizeof(raw_gre), NULL); - - if(ENGINE_ISSET_EVENT(p,GRE_WRONG_VERSION)) { - SCFree(p); - return 1; - } - - SCFree(p); - return 0; -} - - -/** - * \test DecodeGRETest03 is a test for valid gre packet - */ - -static int DecodeGREtest03 (void) -{ - uint8_t raw_gre[] = { - 0x00, 0x6e, 0x62, 0xac, 0x40, 0x00, 0x40, 0x2f, - 0xc2, 0xc7, 0x0a, 0x00, 0x00, 0x64, 0x0a, 0x00, - 0x00, 0x8a, 0x30, 0x01, 0x88, 0x0b, 0x00, 0x4e, - 0x00, 0x00, 0x00, 0x18, 0x4a, 0x50, 0xff, 0x03, - 0x00, 0x21, 0x45, 0x00, 0x00, 0x4a, 0x00, 0x00, - 0x40, 0x00, 0x40, 0x11, 0x94, 0x22, 0x50, 0x7e, - 0x2b, 0x2d, 0xc2, 0x6d, 0x68, 0x68, 0x80, 0x0e, - 0x00, 0x35, 0x00, 0x36, 0x9f, 0x18, 0xdb, 0xc4, - 0x01, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x01, 0x03, 0x73, 0x31, 0x36, 0x09, 0x73, - 0x69, 0x74, 0x65, 0x6d, 0x65, 0x74, 0x65, 0x72, - 0x03, 0x63, 0x6f, 0x6d, 0x00, 0x00, 0x01, 0x00, - 0x01, 0x00, 0x00, 0x29, 0x10, 0x00, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x00 }; - Packet *p = PacketGetFromAlloc(); - if (unlikely(p == NULL)) - return 0; - ThreadVars tv; - DecodeThreadVars dtv; - - memset(&tv, 0, sizeof(ThreadVars)); - memset(&dtv, 0, sizeof(DecodeThreadVars)); - - DecodeGRE(&tv, &dtv, p, raw_gre, sizeof(raw_gre), NULL); - - if(p->greh == NULL) { - SCFree(p); - return 0; - } - - - SCFree(p); - return 1; -} -#endif /* UNITTESTS */ - -/** - * \brief this function registers unit tests for GRE decoder - */ - -void DecodeGRERegisterTests(void) -{ -#ifdef UNITTESTS - UtRegisterTest("DecodeGREtest01", DecodeGREtest01, 1); - UtRegisterTest("DecodeGREtest02", DecodeGREtest02, 1); - UtRegisterTest("DecodeGREtest03", DecodeGREtest03, 1); -#endif /* UNITTESTS */ -} -/** - * @} - */ |