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source/erf: Handle ERF META and PAD record types and extension headers

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Add support for ERF record types META and PAD, plus additional ETH types.

Add support for ERF extension headers.

These types and extension headers were already supported by erf-source-dag.

Made source-erf-file and source-erf-dag more consistent.

Ticket: 8962
pull/16141/head
Stephen Donnelly 2 weeks ago committed by Victor Julien
parent c6dd80f787
commit 3d42f7cf63
2 changed files with 100 additions and 39 deletions
Show Stats Download Patch File Download Diff File

25
src/source-erf-dag.c
Unescape Escape View File

@ -89,6 +89,9 @@ NoErfDagSupportExit(ThreadVars *tv, const void *initdata, void **data)
/* Number of bytes per loop to process before fetching more data. */
#define BYTES_PER_LOOP (4 * 1024 * 1024) /* 4 MB */
#define ERF_EXT_LEN 8
#define ERF_ETH_PAD_LEN 2
extern uint32_t max_pending_packets;
typedef struct ErfDagThreadVars_ {
@ -394,6 +397,10 @@ ProcessErfDagRecords(ErfDagThreadVars *ewtn, uint8_t *top, uint32_t *pkts_read)
while (((top - ewtn->btm) >= dag_record_size) &&
((processed + dag_record_size) < BYTES_PER_LOOP)) {
if (suricata_ctl_flags & SURICATA_STOP) {
SCReturnInt(TM_ECODE_OK);
}
/* Make sure we have at least one packet in the packet pool,
* to prevent us from alloc'ing packets at line rate. */
PacketPoolWait();
@ -419,7 +426,7 @@ ProcessErfDagRecords(ErfDagThreadVars *ewtn, uint8_t *top, uint32_t *pkts_read)
processed += rlen;
/* Only support ethernet at this time. */
switch (hdr_type & 0x7f) {
switch (hdr_type & ERF_TYPE_MASK) {
case ERF_TYPE_PAD:
case ERF_TYPE_META:
/* Skip. */
@ -461,10 +468,10 @@ ProcessErfDagRecord(ErfDagThreadVars *ewtn, char *prec)
{
SCEnter();
int wlen = 0;
int rlen = 0;
uint16_t wlen = 0;
uint16_t rlen = 0;
int hdr_num = 0;
char hdr_type = 0;
uint8_t hdr_type = 0;
dag_record_t *dr = (dag_record_t*)prec;
erf_payload_t *pload;
Packet *p;
@ -474,23 +481,23 @@ ProcessErfDagRecord(ErfDagThreadVars *ewtn, char *prec)
rlen = SCNtohs(dr->rlen);
/* count extension headers */
while (hdr_type & 0x80) {
if (rlen < (dag_record_size + (hdr_num * 8))) {
while (hdr_type & ERF_TYPE_MORE_EXT) {
if (rlen < (dag_record_size + (hdr_num * ERF_EXT_LEN))) {
SCLogError("Insufficient captured packet length.");
SCReturnInt(TM_ECODE_FAILED);
}
hdr_type = prec[(dag_record_size + (hdr_num * 8))];
hdr_type = prec[(dag_record_size + (hdr_num * ERF_EXT_LEN))];
hdr_num++;
}
/* Check that the whole frame was captured */
if (rlen < (dag_record_size + (8 * hdr_num) + 2 + wlen)) {
if (rlen < (dag_record_size + (hdr_num * ERF_EXT_LEN) + ERF_ETH_PAD_LEN + wlen)) {
SCLogInfo("Incomplete frame captured.");
SCReturnInt(TM_ECODE_OK);
}
/* skip over extension headers */
pload = (erf_payload_t *)(prec + dag_record_size + (8 * hdr_num));
pload = (erf_payload_t *)(prec + dag_record_size + (hdr_num * ERF_EXT_LEN));
p = PacketGetFromQueueOrAlloc();
if (p == NULL) {

76
src/source-erf-file.c
Unescape Escape View File

@ -31,7 +31,21 @@
#include "source-erf-file.h"
#include "util-datalink.h"
#define DAG_TYPE_ETH 2
#define ERF_HEADER_LEN 16
#define ERF_EXT_LEN 8
#define ERF_ETH_PAD_LEN 2
#ifndef HAVE_DAG
#define ERF_TYPE_MASK 0x7f
#define ERF_TYPE_MORE_EXT 0x80
#define ERF_TYPE_ETH 2
#define ERF_TYPE_COLOR_ETH 11
#define ERF_TYPE_DSM_COLOR_ETH 16
#define ERF_TYPE_COLOR_HASH_ETH 20
#else /* Implied we do have DAG support */
#include <dagapi.h>
#endif
typedef struct DagFlags_ {
uint8_t iface:2;
@ -50,7 +64,6 @@ typedef struct DagRecord_ {
uint16_t rlen;
uint16_t lctr;
uint16_t wlen;
uint16_t pad;
} __attribute__((packed)) DagRecord;
typedef struct ErfFileThreadVars_ {
@ -131,7 +144,9 @@ TmEcode ReceiveErfFileLoop(ThreadVars *tv, void *data, void *slot)
* to prevent us from alloc'ing packets at line rate. */
PacketPoolWait();
if (p == NULL) {
p = PacketGetFromQueueOrAlloc();
}
if (unlikely(p == NULL)) {
SCLogError("Failed to allocate a packet.");
EngineStop();
@ -144,11 +159,15 @@ TmEcode ReceiveErfFileLoop(ThreadVars *tv, void *data, void *slot)
EngineStop();
SCReturnInt(TM_ECODE_FAILED);
}
if (GET_PKT_LEN(p) == 0) {
continue;
}
if (TmThreadsSlotProcessPkt(etv->tv, etv->slot, p) != TM_ECODE_OK) {
EngineStop();
SCReturnInt(TM_ECODE_FAILED);
}
p = NULL;
}
SCReturnInt(TM_ECODE_FAILED);
}
@ -159,6 +178,8 @@ static inline TmEcode ReadErfRecord(ThreadVars *tv, Packet *p, void *data)
ErfFileThreadVars *etv = (ErfFileThreadVars *)data;
DagRecord dr;
unsigned int hdr_num = 0;
char ext_hdr[ERF_EXT_LEN];
size_t r = fread(&dr, sizeof(DagRecord), 1, etv->erf);
if (r < 1) {
@ -170,19 +191,21 @@ static inline TmEcode ReadErfRecord(ThreadVars *tv, Packet *p, void *data)
}
SCReturnInt(TM_ECODE_FAILED);
}
uint8_t hdr_type = dr.type;
uint16_t rlen = SCNtohs(dr.rlen);
if (rlen < sizeof(DagRecord)) {
if (rlen < ERF_HEADER_LEN) {
SCLogError("Bad ERF record, "
"record length less than size of header");
SCReturnInt(TM_ECODE_FAILED);
}
uint32_t caplen = rlen - sizeof(DagRecord);
if (caplen > MAX_PACKET_SIZE) {
SCLogError("Bad ERF record, capture length %u exceeds max %d", caplen, MAX_PACKET_SIZE);
/* count extension headers */
while (hdr_type & ERF_TYPE_MORE_EXT) {
if (rlen < (ERF_HEADER_LEN + ((hdr_num + 1) * 8))) {
SCLogError("Insufficient captured packet length.");
SCReturnInt(TM_ECODE_FAILED);
}
r = fread(etv->buffer, caplen, 1, etv->erf);
r = fread(ext_hdr, ERF_EXT_LEN, 1, etv->erf);
if (r < 1) {
if (feof(etv->erf)) {
SCLogInfo("End of ERF file reached");
@ -191,6 +214,31 @@ static inline TmEcode ReadErfRecord(ThreadVars *tv, Packet *p, void *data)
}
SCReturnInt(TM_ECODE_FAILED);
}
hdr_type = ext_hdr[0];
hdr_num++;
}
/* read and discard ERF Ethernet pad */
if (rlen < (ERF_HEADER_LEN + (hdr_num * ERF_EXT_LEN) + ERF_ETH_PAD_LEN)) {
SCLogError("Insufficient captured packet length.");
SCReturnInt(TM_ECODE_FAILED);
}
r = fread(ext_hdr, ERF_ETH_PAD_LEN, 1, etv->erf);
if (r < 1) {
if (feof(etv->erf)) {
SCLogInfo("End of ERF file reached");
} else {
SCLogInfo("Error reading ERF record");
}
SCReturnInt(TM_ECODE_FAILED);
}
uint32_t caplen = rlen - (hdr_num * ERF_EXT_LEN) - ERF_HEADER_LEN - ERF_ETH_PAD_LEN;
if (caplen > MAX_PACKET_SIZE) {
SCLogError("Bad ERF record, capture length %u exceeds max %d", caplen, MAX_PACKET_SIZE);
SCReturnInt(TM_ECODE_FAILED);
}
r = fread(etv->buffer, caplen, 1, etv->erf);
if (r < 1) {
if (feof(etv->erf)) {
@ -202,10 +250,16 @@ static inline TmEcode ReadErfRecord(ThreadVars *tv, Packet *p, void *data)
SCReturnInt(TM_ECODE_FAILED);
}
/* Only support ethernet at this time. */
if (dr.type != DAG_TYPE_ETH) {
SCLogError("DAG record type %d not implemented.", dr.type);
SCReturnInt(TM_ECODE_FAILED);
/* Only support ethernet at this time. Return TM_ECODE_OK with pkt len = 0 to indicate skipped
* record */
switch (dr.type & ERF_TYPE_MASK) {
case ERF_TYPE_DSM_COLOR_ETH:
case ERF_TYPE_COLOR_ETH:
case ERF_TYPE_COLOR_HASH_ETH:
case ERF_TYPE_ETH:
break;
default:
SCReturnInt(TM_ECODE_OK);
}
if (PacketCopyData(p, etv->buffer, caplen) != 0) {

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