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/* Copyright (C) 2007-2022 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.
*/
#include "packet.h"
#include "pkt-var.h"
#include "flow.h"
#include "host.h"
#include "util-profiling.h"
#include "util-validate.h"
#include "action-globals.h"
/** \brief issue drop action
*
* Set drop (+reject) flags in both current and root packet.
*
* \param action action bit flags. Must be limited to ACTION_DROP_REJECT
*/
void PacketDrop(Packet *p, const uint8_t action, enum PacketDropReason r)
{
DEBUG_VALIDATE_BUG_ON((action & ~ACTION_DROP_REJECT) != 0);
if (p->drop_reason == PKT_DROP_REASON_NOT_SET)
p->drop_reason = (uint8_t)r;
if (p->root) {
p->root->action |= action;
if (p->root->drop_reason == PKT_DROP_REASON_NOT_SET) {
p->root->drop_reason = PKT_DROP_REASON_INNER_PACKET;
}
}
p->action |= action;
}
bool PacketCheckAction(const Packet *p, const uint8_t a)
{
if (likely(p->root == NULL)) {
return (p->action & a) != 0;
} else {
/* check against both */
const uint8_t actions = p->action | p->root->action;
return (actions & a) != 0;
}
}
/**
* \brief Initialize a packet structure for use.
*/
void PacketInit(Packet *p)
{
SCSpinInit(&p->persistent.tunnel_lock, 0);
p->alerts.alerts = PacketAlertCreate();
PACKET_RESET_CHECKSUMS(p);
p->livedev = NULL;
}
void PacketReleaseRefs(Packet *p)
{
FlowDeReference(&p->flow);
HostDeReference(&p->host_src);
HostDeReference(&p->host_dst);
}
/**
* \brief Recycle a packet structure for reuse.
*/
void PacketReinit(Packet *p)
{
/* clear the address structure by setting all fields to 0 */
#define CLEAR_ADDR(a) \
do { \
(a)->family = 0; \
(a)->addr_data32[0] = 0; \
(a)->addr_data32[1] = 0; \
(a)->addr_data32[2] = 0; \
(a)->addr_data32[3] = 0; \
} while (0)
CLEAR_ADDR(&p->src);
CLEAR_ADDR(&p->dst);
p->sp = 0;
p->dp = 0;
p->proto = 0;
p->recursion_level = 0;
PACKET_FREE_EXTDATA(p);
p->app_update_direction = 0;
p->flags = 0;
p->flowflags = 0;
p->pkt_src = 0;
p->vlan_id[0] = 0;
p->vlan_id[1] = 0;
p->vlan_idx = 0;
SCTIME_INIT(p->ts);
p->datalink = 0;
p->drop_reason = 0;
#define PACKET_RESET_ACTION(p) (p)->action = 0
PACKET_RESET_ACTION(p);
if (p->pktvar != NULL) {
PktVarFree(p->pktvar);
p->pktvar = NULL;
}
p->ethh = NULL;
if (p->ip4h != NULL) {
CLEAR_IPV4_PACKET(p);
}
if (p->ip6h != NULL) {
CLEAR_IPV6_PACKET(p);
}
if (p->tcph != NULL) {
CLEAR_TCP_PACKET(p);
}
if (p->udph != NULL) {
CLEAR_UDP_PACKET(p);
}
if (p->sctph != NULL) {
CLEAR_SCTP_PACKET(p);
}
if (p->esph != NULL) {
CLEAR_ESP_PACKET(p);
}
if (p->icmpv4h != NULL) {
CLEAR_ICMPV4_PACKET(p);
}
if (p->icmpv6h != NULL) {
CLEAR_ICMPV6_PACKET(p);
}
p->ppph = NULL;
p->pppoesh = NULL;
p->pppoedh = NULL;
p->greh = NULL;
p->payload = NULL;
p->payload_len = 0;
p->BypassPacketsFlow = NULL;
#define RESET_PKT_LEN(p) ((p)->pktlen = 0)
RESET_PKT_LEN(p);
p->alerts.cnt = 0;
p->alerts.discarded = 0;
p->alerts.suppressed = 0;
p->alerts.drop.action = 0;
p->pcap_cnt = 0;
p->tunnel_rtv_cnt = 0;
p->tunnel_tpr_cnt = 0;
p->events.cnt = 0;
AppLayerDecoderEventsResetEvents(p->app_layer_events);
p->next = NULL;
p->prev = NULL;
p->root = NULL;
p->livedev = NULL;
PACKET_RESET_CHECKSUMS(p);
PACKET_PROFILING_RESET(p);
p->tenant_id = 0;
p->nb_decoded_layers = 0;
}
void PacketRecycle(Packet *p)
{
PacketReleaseRefs(p);
PacketReinit(p);
}
/**
* \brief Cleanup a packet so that we can free it. No memset needed..
*/
void PacketDestructor(Packet *p)
{
PacketReleaseRefs(p);
if (p->pktvar != NULL) {
PktVarFree(p->pktvar);
}
PacketAlertFree(p->alerts.alerts);
PACKET_FREE_EXTDATA(p);
SCSpinDestroy(&p->persistent.tunnel_lock);
AppLayerDecoderEventsFreeEvents(&p->app_layer_events);
PACKET_PROFILING_RESET(p);
}
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