1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
/* 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.
*/
/**
* \file
*
* \author Victor Julien <victor@inliniac.net>
*
* Flow utility functions
*/
#include "suricata-common.h"
#include "threads.h"
#include "flow.h"
#include "flow-private.h"
#include "flow-util.h"
#include "flow-var.h"
#include "app-layer.h"
#include "util-var.h"
#include "util-debug.h"
#include "flow-storage.h"
#include "detect.h"
#include "detect-engine-state.h"
/** \brief allocate a flow
*
* We check against the memuse counter. If it passes that check we increment
* the counter first, then we try to alloc.
*
* \retval f the flow or NULL on out of memory
*/
Flow *FlowAlloc(void)
{
Flow *f;
size_t size = sizeof(Flow) + FlowStorageSize();
if (!(FLOW_CHECK_MEMCAP(size))) {
return NULL;
}
(void) SC_ATOMIC_ADD(flow_memuse, size);
f = SCMalloc(size);
if (unlikely(f == NULL)) {
(void)SC_ATOMIC_SUB(flow_memuse, size);
return NULL;
}
memset(f, 0, size);
FLOW_INITIALIZE(f);
return f;
}
/**
* \brief cleanup & free the memory of a flow
*
* \param f flow to clear & destroy
*/
void FlowFree(Flow *f)
{
FLOW_DESTROY(f);
SCFree(f);
size_t size = sizeof(Flow) + FlowStorageSize();
(void) SC_ATOMIC_SUB(flow_memuse, size);
}
/**
* \brief Function to map the protocol to the defined FLOW_PROTO_* enumeration.
*
* \param proto protocol which is needed to be mapped
*/
uint8_t FlowGetProtoMapping(uint8_t proto)
{
switch (proto) {
case IPPROTO_TCP:
return FLOW_PROTO_TCP;
case IPPROTO_UDP:
return FLOW_PROTO_UDP;
case IPPROTO_ICMP:
return FLOW_PROTO_ICMP;
case IPPROTO_SCTP:
return FLOW_PROTO_SCTP;
default:
return FLOW_PROTO_DEFAULT;
}
}
uint8_t FlowGetReverseProtoMapping(uint8_t rproto)
{
switch (rproto) {
case FLOW_PROTO_TCP:
return IPPROTO_TCP;
case FLOW_PROTO_UDP:
return IPPROTO_UDP;
case FLOW_PROTO_ICMP:
return IPPROTO_ICMP;
case FLOW_PROTO_SCTP:
return IPPROTO_SCTP;
default:
exit(EXIT_FAILURE);
}
}
/* initialize the flow from the first packet
* we see from it. */
void FlowInit(Flow *f, const Packet *p)
{
SCEnter();
SCLogDebug("flow %p", f);
f->proto = p->proto;
f->recursion_level = p->recursion_level;
f->vlan_id[0] = p->vlan_id[0];
f->vlan_id[1] = p->vlan_id[1];
if (PKT_IS_IPV4(p)) {
FLOW_SET_IPV4_SRC_ADDR_FROM_PACKET(p, &f->src);
FLOW_SET_IPV4_DST_ADDR_FROM_PACKET(p, &f->dst);
f->flags |= FLOW_IPV4;
} else if (PKT_IS_IPV6(p)) {
FLOW_SET_IPV6_SRC_ADDR_FROM_PACKET(p, &f->src);
FLOW_SET_IPV6_DST_ADDR_FROM_PACKET(p, &f->dst);
f->flags |= FLOW_IPV6;
}
#ifdef DEBUG
/* XXX handle default */
else {
printf("FIXME: %s:%s:%" PRId32 "\n", __FILE__, __FUNCTION__, __LINE__);
}
#endif
if (p->tcph != NULL) { /* XXX MACRO */
SET_TCP_SRC_PORT(p,&f->sp);
SET_TCP_DST_PORT(p,&f->dp);
} else if (p->udph != NULL) { /* XXX MACRO */
SET_UDP_SRC_PORT(p,&f->sp);
SET_UDP_DST_PORT(p,&f->dp);
} else if (p->icmpv4h != NULL) {
f->type = p->type;
f->code = p->code;
} else if (p->icmpv6h != NULL) {
f->type = p->type;
f->code = p->code;
} else if (p->sctph != NULL) { /* XXX MACRO */
SET_SCTP_SRC_PORT(p,&f->sp);
SET_SCTP_DST_PORT(p,&f->dp);
} /* XXX handle default */
#ifdef DEBUG
else {
printf("FIXME: %s:%s:%" PRId32 "\n", __FILE__, __FUNCTION__, __LINE__);
}
#endif
COPY_TIMESTAMP(&p->ts, &f->startts);
f->protomap = FlowGetProtoMapping(f->proto);
SCReturn;
}
|
