diff options
author | Ashlee Young <ashlee@onosfw.com> | 2015-09-09 22:21:41 -0700 |
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committer | Ashlee Young <ashlee@onosfw.com> | 2015-09-09 22:21:41 -0700 |
commit | 8879b125d26e8db1a5633de5a9c692eb2d1c4f83 (patch) | |
tree | c7259d85a991b83dfa85ab2e339360669fc1f58e /framework/src/suricata/src/decode-erspan.c | |
parent | 13d05bc8458758ee39cb829098241e89616717ee (diff) |
suricata checkin based on commit id a4bce14770beee46a537eda3c3f6e8e8565d5d0a
Change-Id: I9a214fa0ee95e58fc640e50bd604dac7f42db48f
Diffstat (limited to 'framework/src/suricata/src/decode-erspan.c')
-rw-r--r-- | framework/src/suricata/src/decode-erspan.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/framework/src/suricata/src/decode-erspan.c b/framework/src/suricata/src/decode-erspan.c new file mode 100644 index 00000000..f2fb0eb1 --- /dev/null +++ b/framework/src/suricata/src/decode-erspan.c @@ -0,0 +1,81 @@ +/* Copyright (C) 2015 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 Victor Julien <victor@inliniac.net> + * + * Decodes ERSPAN + */ + +#include "suricata-common.h" +#include "suricata.h" +#include "decode.h" +#include "decode-events.h" +#include "decode-erspan.h" + +#include "util-unittest.h" +#include "util-debug.h" + +/** + * \brief Function to decode ERSPAN packets + */ + +int DecodeERSPAN(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, uint8_t *pkt, uint16_t len, PacketQueue *pq) +{ + StatsIncr(tv, dtv->counter_erspan); + + if (len < sizeof(ErspanHdr)) { + ENGINE_SET_EVENT(p,ERSPAN_HEADER_TOO_SMALL); + return TM_ECODE_FAILED; + } + + const ErspanHdr *ehdr = (const ErspanHdr *)pkt; + uint16_t version = ntohs(ehdr->ver_vlan) >> 12; + uint16_t vlan_id = ntohs(ehdr->ver_vlan) & 0x0fff; + + SCLogDebug("ERSPAN: version %u vlan %u", version, vlan_id); + + /* only v1 is tested at this time */ + if (version != 1) { + ENGINE_SET_EVENT(p,ERSPAN_UNSUPPORTED_VERSION); + return TM_ECODE_FAILED; + } + + if (vlan_id > 0 && dtv->vlan_disabled == 0) { + if (p->vlan_idx >= 2) { + ENGINE_SET_EVENT(p,ERSPAN_TOO_MANY_VLAN_LAYERS); + return TM_ECODE_FAILED; + } + p->vlan_id[p->vlan_idx] = vlan_id; + p->vlan_idx++; + } + + return DecodeEthernet(tv, dtv, p, pkt + sizeof(ErspanHdr), len - sizeof(ErspanHdr), pq); +} + +/** + * @} + */ |