/*
- * pcap-dag.c: Packet capture interface for Endace DAG card.
+ * pcap-dag.c: Packet capture interface for Emulex EndaceDAG cards.
*
* The functionality of this code attempts to mimic that of pcap-linux as much
* as possible. This code is compiled in several different ways depending on
* is not defined then nothing is altered - the dag_ functions will be
* called as required from their pcap-linux/bpf equivalents.
*
- * Author: Richard Littin, Sean Irvine ({richard,sean}@reeltwo.com)
- *
- * Modifications:
- * Code shuffled around to suit fad-xxx.c structure
- * Added atexit() handler to stop DAG if application is too lazy
+ * Authors: Richard Littin, Sean Irvine ({richard,sean}@reeltwo.com)
+ * Modifications: Jesper Peterson
+ * Koryn Grant
*/
-#ifndef lint
-static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/libpcap/pcap-dag.c,v 1.6 2003-07-25 05:32:02 guy Exp $ (LBL)";
-#endif
-
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "pcap-int.h"
+#include <ctype.h>
+#include <netinet/in.h>
#include <sys/mman.h>
#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
struct mbuf; /* Squelch compiler warnings on some platforms for */
struct rtentry; /* declarations in <net/if.h> */
#include <net/if.h>
-#include <dagnew.h>
-#include <dagapi.h>
+#include "dagnew.h"
+#include "dagapi.h"
+#include "dagpci.h"
+
+#include "pcap-dag.h"
+
+/*
+ * DAG devices have names beginning with "dag", followed by a number
+ * from 0 to DAG_MAX_BOARDS, then optionally a colon and a stream number
+ * from 0 to DAG_STREAM_MAX.
+ */
+#ifndef DAG_MAX_BOARDS
+#define DAG_MAX_BOARDS 32
+#endif
+
+
+#ifndef TYPE_AAL5
+#define TYPE_AAL5 4
+#endif
+
+#ifndef TYPE_MC_HDLC
+#define TYPE_MC_HDLC 5
+#endif
+
+#ifndef TYPE_MC_RAW
+#define TYPE_MC_RAW 6
+#endif
+
+#ifndef TYPE_MC_ATM
+#define TYPE_MC_ATM 7
+#endif
+
+#ifndef TYPE_MC_RAW_CHANNEL
+#define TYPE_MC_RAW_CHANNEL 8
+#endif
+
+#ifndef TYPE_MC_AAL5
+#define TYPE_MC_AAL5 9
+#endif
+
+#ifndef TYPE_COLOR_HDLC_POS
+#define TYPE_COLOR_HDLC_POS 10
+#endif
+
+#ifndef TYPE_COLOR_ETH
+#define TYPE_COLOR_ETH 11
+#endif
+
+#ifndef TYPE_MC_AAL2
+#define TYPE_MC_AAL2 12
+#endif
+
+#ifndef TYPE_IP_COUNTER
+#define TYPE_IP_COUNTER 13
+#endif
+
+#ifndef TYPE_TCP_FLOW_COUNTER
+#define TYPE_TCP_FLOW_COUNTER 14
+#endif
+
+#ifndef TYPE_DSM_COLOR_HDLC_POS
+#define TYPE_DSM_COLOR_HDLC_POS 15
+#endif
+
+#ifndef TYPE_DSM_COLOR_ETH
+#define TYPE_DSM_COLOR_ETH 16
+#endif
+
+#ifndef TYPE_COLOR_MC_HDLC_POS
+#define TYPE_COLOR_MC_HDLC_POS 17
+#endif
+
+#ifndef TYPE_AAL2
+#define TYPE_AAL2 18
+#endif
+
+#ifndef TYPE_COLOR_HASH_POS
+#define TYPE_COLOR_HASH_POS 19
+#endif
+
+#ifndef TYPE_COLOR_HASH_ETH
+#define TYPE_COLOR_HASH_ETH 20
+#endif
+
+#ifndef TYPE_INFINIBAND
+#define TYPE_INFINIBAND 21
+#endif
+
+#ifndef TYPE_IPV4
+#define TYPE_IPV4 22
+#endif
+
+#ifndef TYPE_IPV6
+#define TYPE_IPV6 23
+#endif
+
+#ifndef TYPE_RAW_LINK
+#define TYPE_RAW_LINK 24
+#endif
+
+#ifndef TYPE_INFINIBAND_LINK
+#define TYPE_INFINIBAND_LINK 25
+#endif
+
+#ifndef TYPE_PAD
+#define TYPE_PAD 48
+#endif
+
+#define ATM_CELL_SIZE 52
+#define ATM_HDR_SIZE 4
+
+/*
+ * A header containing additional MTP information.
+ */
+#define MTP2_SENT_OFFSET 0 /* 1 byte */
+#define MTP2_ANNEX_A_USED_OFFSET 1 /* 1 byte */
+#define MTP2_LINK_NUMBER_OFFSET 2 /* 2 bytes */
+#define MTP2_HDR_LEN 4 /* length of the header */
+
+#define MTP2_ANNEX_A_NOT_USED 0
+#define MTP2_ANNEX_A_USED 1
+#define MTP2_ANNEX_A_USED_UNKNOWN 2
+
+/* SunATM pseudo header */
+struct sunatm_hdr {
+ unsigned char flags; /* destination and traffic type */
+ unsigned char vpi; /* VPI */
+ unsigned short vci; /* VCI */
+};
-#define MAX_DAG_SNAPLEN 2040
+/*
+ * Private data for capturing on DAG devices.
+ */
+struct pcap_dag {
+ struct pcap_stat stat;
+#ifdef HAVE_DAG_STREAMS_API
+ u_char *dag_mem_bottom; /* DAG card current memory bottom pointer */
+ u_char *dag_mem_top; /* DAG card current memory top pointer */
+#else /* HAVE_DAG_STREAMS_API */
+ void *dag_mem_base; /* DAG card memory base address */
+ u_int dag_mem_bottom; /* DAG card current memory bottom offset */
+ u_int dag_mem_top; /* DAG card current memory top offset */
+#endif /* HAVE_DAG_STREAMS_API */
+ int dag_fcs_bits; /* Number of checksum bits from link layer */
+ int dag_offset_flags; /* Flags to pass to dag_offset(). */
+ int dag_stream; /* DAG stream number */
+ int dag_timeout; /* timeout specified to pcap_open_live.
+ * Same as in linux above, introduce
+ * generally? */
+};
typedef struct pcap_dag_node {
- struct pcap_dag_node *next;
- pcap_t *p;
+ struct pcap_dag_node *next;
+ pcap_t *p;
+ pid_t pid;
} pcap_dag_node_t;
static pcap_dag_node_t *pcap_dags = NULL;
static int atexit_handler_installed = 0;
+static const unsigned short endian_test_word = 0x0100;
-#ifdef DAG_ONLY
-/* This code is reguired when compiling for a DAG device only. */
-#include "pcap-dag.h"
+#define IS_BIGENDIAN() (*((unsigned char *)&endian_test_word))
+
+#define MAX_DAG_PACKET 65536
-/* Replace dag function names with pcap equivalent. */
-#define dag_open_live pcap_open_live
-#define dag_platform_finddevs pcap_platform_finddevs
-#endif /* DAG_ONLY */
+static unsigned char TempPkt[MAX_DAG_PACKET];
static int dag_setfilter(pcap_t *p, struct bpf_program *fp);
static int dag_stats(pcap_t *p, struct pcap_stat *ps);
static int dag_set_datalink(pcap_t *p, int dlt);
+static int dag_get_datalink(pcap_t *p);
+static int dag_setnonblock(pcap_t *p, int nonblock, char *errbuf);
-static void delete_pcap_dag(pcap_t *p) {
- pcap_dag_node_t *curr = NULL, *prev = NULL;
-
- for (prev = NULL, curr = pcap_dags;
- curr != NULL && curr->p != p;
- prev = curr, curr = curr->next) {
- /* empty */
- }
-
- if (curr != NULL && curr->p == p) {
- if (prev != NULL) {
- prev->next = curr->next;
- } else {
- pcap_dags = curr->next;
- }
- }
+static void
+delete_pcap_dag(pcap_t *p)
+{
+ pcap_dag_node_t *curr = NULL, *prev = NULL;
+
+ for (prev = NULL, curr = pcap_dags; curr != NULL && curr->p != p; prev = curr, curr = curr->next) {
+ /* empty */
+ }
+
+ if (curr != NULL && curr->p == p) {
+ if (prev != NULL) {
+ prev->next = curr->next;
+ } else {
+ pcap_dags = curr->next;
+ }
+ }
}
/*
* in the pcap_t structure, and closes the file descriptor for the DAG card.
*/
-static void dag_platform_close(pcap_t *p) {
-
-#ifdef linux
- if (p != NULL && p->md.device != NULL) {
- if(dag_stop(p->fd) < 0)
- fprintf(stderr,"dag_stop %s: %s\n", p->md.device, strerror(errno));
- if(dag_close(p->fd) < 0)
- fprintf(stderr,"dag_close %s: %s\n", p->md.device, strerror(errno));
-
- free(p->md.device);
- }
+static void
+dag_platform_cleanup(pcap_t *p)
+{
+ struct pcap_dag *pd = p->priv;
+
+#ifdef HAVE_DAG_STREAMS_API
+ if(dag_stop_stream(p->fd, pd->dag_stream) < 0)
+ fprintf(stderr,"dag_stop_stream: %s\n", strerror(errno));
+
+ if(dag_detach_stream(p->fd, pd->dag_stream) < 0)
+ fprintf(stderr,"dag_detach_stream: %s\n", strerror(errno));
#else
- if (p != NULL) {
- if(dag_stop(p->fd) < 0)
- fprintf(stderr,"dag_stop: %s\n", strerror(errno));
- if(dag_close(p->fd) < 0)
- fprintf(stderr,"dag_close: %s\n", strerror(errno));
- }
-#endif
- delete_pcap_dag(p);
- /* XXX - does "dag_close()" do this? If so, we don't need to. */
- close(p->fd);
+ if(dag_stop(p->fd) < 0)
+ fprintf(stderr,"dag_stop: %s\n", strerror(errno));
+#endif /* HAVE_DAG_STREAMS_API */
+ if(p->fd != -1) {
+ if(dag_close(p->fd) < 0)
+ fprintf(stderr,"dag_close: %s\n", strerror(errno));
+ p->fd = -1;
+ }
+ delete_pcap_dag(p);
+ pcap_cleanup_live_common(p);
+ /* Note: don't need to call close(p->fd) here as dag_close(p->fd) does this. */
}
-static void atexit_handler(void) {
- while (pcap_dags != NULL) {
- dag_platform_close(pcap_dags->p);
- }
+static void
+atexit_handler(void)
+{
+ while (pcap_dags != NULL) {
+ if (pcap_dags->pid == getpid()) {
+ if (pcap_dags->p != NULL)
+ dag_platform_cleanup(pcap_dags->p);
+ } else {
+ delete_pcap_dag(pcap_dags->p);
+ }
+ }
}
-static int new_pcap_dag(pcap_t *p) {
- pcap_dag_node_t *node = NULL;
+static int
+new_pcap_dag(pcap_t *p)
+{
+ pcap_dag_node_t *node = NULL;
- if ((node = malloc(sizeof(pcap_dag_node_t))) == NULL) {
- return -1;
- }
+ if ((node = malloc(sizeof(pcap_dag_node_t))) == NULL) {
+ return -1;
+ }
- if (!atexit_handler_installed) {
- atexit(atexit_handler);
- atexit_handler_installed = 1;
- }
+ if (!atexit_handler_installed) {
+ atexit(atexit_handler);
+ atexit_handler_installed = 1;
+ }
- node->next = pcap_dags;
- node->p = p;
+ node->next = pcap_dags;
+ node->p = p;
+ node->pid = getpid();
- return 0;
-}
+ pcap_dags = node;
-/*
- * Get pointer to the ERF header for the next packet in the input
- * stream. This function blocks until a packet becomes available.
- */
-static dag_record_t *get_next_dag_header(pcap_t *p) {
- register dag_record_t *record;
- int rlen;
-
- if (p->md.dag_mem_top - p->md.dag_mem_bottom < dag_record_size) {
- p->md.dag_mem_top = dag_offset(p->fd, &(p->md.dag_mem_bottom), 0);
- }
-
- record = (dag_record_t *)(p->md.dag_mem_base + p->md.dag_mem_bottom);
- rlen = ntohs(record->rlen);
- while (p->md.dag_mem_top - p->md.dag_mem_bottom < rlen) {
- p->md.dag_mem_top = dag_offset(p->fd, &(p->md.dag_mem_bottom), 0);
- record = (dag_record_t *)(p->md.dag_mem_base + p->md.dag_mem_bottom);
- rlen = ntohs(record->rlen);
- }
-
- p->md.dag_mem_bottom += rlen;
-
- return record;
+ return 0;
}
-/* Size of payload in ATM packets */
-#define ATM_CAPTURE_SIZE 48
+static unsigned int
+dag_erf_ext_header_count(uint8_t * erf, size_t len)
+{
+ uint32_t hdr_num = 0;
+ uint8_t hdr_type;
-/* Size of payload of Ethernet packet */
-#define ETHERNET_LENGTH(h) min(ntohs((h)->wlen) - 4, ntohs((h)->rlen) - dag_record_size - 2 - (ntohs((h)->wlen) & 0x3))
+ /* basic sanity checks */
+ if ( erf == NULL )
+ return 0;
+ if ( len < 16 )
+ return 0;
-/* Size of HDLC packet */
-#define HDLC_LENGTH(h) min(ntohs((h)->wlen) - 4, ntohs((h)->rlen) - dag_record_size)
+ /* check if we have any extension headers */
+ if ( (erf[8] & 0x80) == 0x00 )
+ return 0;
-#ifndef min
-#define min(a, b) ((a) > (b) ? (b) : (a))
-#endif
+ /* loop over the extension headers */
+ do {
+
+ /* sanity check we have enough bytes */
+ if ( len < (24 + (hdr_num * 8)) )
+ return hdr_num;
+
+ /* get the header type */
+ hdr_type = erf[(16 + (hdr_num * 8))];
+ hdr_num++;
+
+ } while ( hdr_type & 0x80 );
+
+ return hdr_num;
+}
/*
- * Swap byte ordering of unsigned long long on a big endian
- * machine.
+ * Read at most max_packets from the capture stream and call the callback
+ * for each of them. Returns the number of packets handled, -1 if an
+ * error occured, or -2 if we were told to break out of the loop.
*/
-static unsigned long long swapll(unsigned long long ull) {
-#if (BYTE_ORDER == BIG_ENDIAN)
- return ((ull & 0xff00000000000000LL) >> 56) |
- ((ull & 0x00ff000000000000LL) >> 40) |
- ((ull & 0x0000ff0000000000LL) >> 24) |
- ((ull & 0x000000ff00000000LL) >> 8) |
- ((ull & 0x00000000ff000000LL) << 8) |
- ((ull & 0x0000000000ff0000LL) << 24) |
- ((ull & 0x000000000000ff00LL) << 40) |
- ((ull & 0x00000000000000ffLL) << 56) ;
+static int
+dag_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
+{
+ struct pcap_dag *pd = p->priv;
+ unsigned int processed = 0;
+ int flags = pd->dag_offset_flags;
+ unsigned int nonblocking = flags & DAGF_NONBLOCK;
+ unsigned int num_ext_hdr = 0;
+ unsigned int ticks_per_second;
+
+ /* Get the next bufferful of packets (if necessary). */
+ while (pd->dag_mem_top - pd->dag_mem_bottom < dag_record_size) {
+
+ /*
+ * Has "pcap_breakloop()" been called?
+ */
+ if (p->break_loop) {
+ /*
+ * Yes - clear the flag that indicates that
+ * it has, and return -2 to indicate that
+ * we were told to break out of the loop.
+ */
+ p->break_loop = 0;
+ return -2;
+ }
+
+#ifdef HAVE_DAG_STREAMS_API
+ /* dag_advance_stream() will block (unless nonblock is called)
+ * until 64kB of data has accumulated.
+ * If to_ms is set, it will timeout before 64kB has accumulated.
+ * We wait for 64kB because processing a few packets at a time
+ * can cause problems at high packet rates (>200kpps) due
+ * to inefficiencies.
+ * This does mean if to_ms is not specified the capture may 'hang'
+ * for long periods if the data rate is extremely slow (<64kB/sec)
+ * If non-block is specified it will return immediately. The user
+ * is then responsible for efficiency.
+ */
+ if ( NULL == (pd->dag_mem_top = dag_advance_stream(p->fd, pd->dag_stream, &(pd->dag_mem_bottom))) ) {
+ return -1;
+ }
#else
- return ull;
+ /* dag_offset does not support timeouts */
+ pd->dag_mem_top = dag_offset(p->fd, &(pd->dag_mem_bottom), flags);
+#endif /* HAVE_DAG_STREAMS_API */
+
+ if (nonblocking && (pd->dag_mem_top - pd->dag_mem_bottom < dag_record_size))
+ {
+ /* Pcap is configured to process only available packets, and there aren't any, return immediately. */
+ return 0;
+ }
+
+ if(!nonblocking &&
+ pd->dag_timeout &&
+ (pd->dag_mem_top - pd->dag_mem_bottom < dag_record_size))
+ {
+ /* Blocking mode, but timeout set and no data has arrived, return anyway.*/
+ return 0;
+ }
+
+ }
+
+ /* Process the packets. */
+ while (pd->dag_mem_top - pd->dag_mem_bottom >= dag_record_size) {
+
+ unsigned short packet_len = 0;
+ int caplen = 0;
+ struct pcap_pkthdr pcap_header;
+
+#ifdef HAVE_DAG_STREAMS_API
+ dag_record_t *header = (dag_record_t *)(pd->dag_mem_bottom);
+#else
+ dag_record_t *header = (dag_record_t *)(pd->dag_mem_base + pd->dag_mem_bottom);
+#endif /* HAVE_DAG_STREAMS_API */
+
+ u_char *dp = ((u_char *)header); /* + dag_record_size; */
+ unsigned short rlen;
+
+ /*
+ * Has "pcap_breakloop()" been called?
+ */
+ if (p->break_loop) {
+ /*
+ * Yes - clear the flag that indicates that
+ * it has, and return -2 to indicate that
+ * we were told to break out of the loop.
+ */
+ p->break_loop = 0;
+ return -2;
+ }
+
+ rlen = ntohs(header->rlen);
+ if (rlen < dag_record_size)
+ {
+ strncpy(p->errbuf, "dag_read: record too small", PCAP_ERRBUF_SIZE);
+ return -1;
+ }
+ pd->dag_mem_bottom += rlen;
+
+ /* Count lost packets. */
+ switch((header->type & 0x7f)) {
+ /* in these types the color value overwrites the lctr */
+ case TYPE_COLOR_HDLC_POS:
+ case TYPE_COLOR_ETH:
+ case TYPE_DSM_COLOR_HDLC_POS:
+ case TYPE_DSM_COLOR_ETH:
+ case TYPE_COLOR_MC_HDLC_POS:
+ case TYPE_COLOR_HASH_ETH:
+ case TYPE_COLOR_HASH_POS:
+ break;
+
+ default:
+ if (header->lctr) {
+ if (pd->stat.ps_drop > (UINT_MAX - ntohs(header->lctr))) {
+ pd->stat.ps_drop = UINT_MAX;
+ } else {
+ pd->stat.ps_drop += ntohs(header->lctr);
+ }
+ }
+ }
+
+ if ((header->type & 0x7f) == TYPE_PAD) {
+ continue;
+ }
+
+ num_ext_hdr = dag_erf_ext_header_count(dp, rlen);
+
+ /* ERF encapsulation */
+ /* The Extensible Record Format is not dropped for this kind of encapsulation,
+ * and will be handled as a pseudo header by the decoding application.
+ * The information carried in the ERF header and in the optional subheader (if present)
+ * could be merged with the libpcap information, to offer a better decoding.
+ * The packet length is
+ * o the length of the packet on the link (header->wlen),
+ * o plus the length of the ERF header (dag_record_size), as the length of the
+ * pseudo header will be adjusted during the decoding,
+ * o plus the length of the optional subheader (if present).
+ *
+ * The capture length is header.rlen and the byte stuffing for alignment will be dropped
+ * if the capture length is greater than the packet length.
+ */
+ if (p->linktype == DLT_ERF) {
+ packet_len = ntohs(header->wlen) + dag_record_size;
+ caplen = rlen;
+ switch ((header->type & 0x7f)) {
+ case TYPE_MC_AAL5:
+ case TYPE_MC_ATM:
+ case TYPE_MC_HDLC:
+ case TYPE_MC_RAW_CHANNEL:
+ case TYPE_MC_RAW:
+ case TYPE_MC_AAL2:
+ case TYPE_COLOR_MC_HDLC_POS:
+ packet_len += 4; /* MC header */
+ break;
+
+ case TYPE_COLOR_HASH_ETH:
+ case TYPE_DSM_COLOR_ETH:
+ case TYPE_COLOR_ETH:
+ case TYPE_ETH:
+ packet_len += 2; /* ETH header */
+ break;
+ } /* switch type */
+
+ /* Include ERF extension headers */
+ packet_len += (8 * num_ext_hdr);
+
+ if (caplen > packet_len) {
+ caplen = packet_len;
+ }
+ } else {
+ /* Other kind of encapsulation according to the header Type */
+
+ /* Skip over generic ERF header */
+ dp += dag_record_size;
+ /* Skip over extension headers */
+ dp += 8 * num_ext_hdr;
+
+ switch((header->type & 0x7f)) {
+ case TYPE_ATM:
+ case TYPE_AAL5:
+ if (header->type == TYPE_AAL5) {
+ packet_len = ntohs(header->wlen);
+ caplen = rlen - dag_record_size;
+ }
+ case TYPE_MC_ATM:
+ if (header->type == TYPE_MC_ATM) {
+ caplen = packet_len = ATM_CELL_SIZE;
+ dp+=4;
+ }
+ case TYPE_MC_AAL5:
+ if (header->type == TYPE_MC_AAL5) {
+ packet_len = ntohs(header->wlen);
+ caplen = rlen - dag_record_size - 4;
+ dp+=4;
+ }
+ /* Skip over extension headers */
+ caplen -= (8 * num_ext_hdr);
+
+ if (header->type == TYPE_ATM) {
+ caplen = packet_len = ATM_CELL_SIZE;
+ }
+ if (p->linktype == DLT_SUNATM) {
+ struct sunatm_hdr *sunatm = (struct sunatm_hdr *)dp;
+ unsigned long rawatm;
+
+ rawatm = ntohl(*((unsigned long *)dp));
+ sunatm->vci = htons((rawatm >> 4) & 0xffff);
+ sunatm->vpi = (rawatm >> 20) & 0x00ff;
+ sunatm->flags = ((header->flags.iface & 1) ? 0x80 : 0x00) |
+ ((sunatm->vpi == 0 && sunatm->vci == htons(5)) ? 6 :
+ ((sunatm->vpi == 0 && sunatm->vci == htons(16)) ? 5 :
+ ((dp[ATM_HDR_SIZE] == 0xaa &&
+ dp[ATM_HDR_SIZE+1] == 0xaa &&
+ dp[ATM_HDR_SIZE+2] == 0x03) ? 2 : 1)));
+
+ } else {
+ packet_len -= ATM_HDR_SIZE;
+ caplen -= ATM_HDR_SIZE;
+ dp += ATM_HDR_SIZE;
+ }
+ break;
+
+ case TYPE_COLOR_HASH_ETH:
+ case TYPE_DSM_COLOR_ETH:
+ case TYPE_COLOR_ETH:
+ case TYPE_ETH:
+ packet_len = ntohs(header->wlen);
+ packet_len -= (pd->dag_fcs_bits >> 3);
+ caplen = rlen - dag_record_size - 2;
+ /* Skip over extension headers */
+ caplen -= (8 * num_ext_hdr);
+ if (caplen > packet_len) {
+ caplen = packet_len;
+ }
+ dp += 2;
+ break;
+
+ case TYPE_COLOR_HASH_POS:
+ case TYPE_DSM_COLOR_HDLC_POS:
+ case TYPE_COLOR_HDLC_POS:
+ case TYPE_HDLC_POS:
+ packet_len = ntohs(header->wlen);
+ packet_len -= (pd->dag_fcs_bits >> 3);
+ caplen = rlen - dag_record_size;
+ /* Skip over extension headers */
+ caplen -= (8 * num_ext_hdr);
+ if (caplen > packet_len) {
+ caplen = packet_len;
+ }
+ break;
+
+ case TYPE_COLOR_MC_HDLC_POS:
+ case TYPE_MC_HDLC:
+ packet_len = ntohs(header->wlen);
+ packet_len -= (pd->dag_fcs_bits >> 3);
+ caplen = rlen - dag_record_size - 4;
+ /* Skip over extension headers */
+ caplen -= (8 * num_ext_hdr);
+ if (caplen > packet_len) {
+ caplen = packet_len;
+ }
+ /* jump the MC_HDLC_HEADER */
+ dp += 4;
+#ifdef DLT_MTP2_WITH_PHDR
+ if (p->linktype == DLT_MTP2_WITH_PHDR) {
+ /* Add the MTP2 Pseudo Header */
+ caplen += MTP2_HDR_LEN;
+ packet_len += MTP2_HDR_LEN;
+
+ TempPkt[MTP2_SENT_OFFSET] = 0;
+ TempPkt[MTP2_ANNEX_A_USED_OFFSET] = MTP2_ANNEX_A_USED_UNKNOWN;
+ *(TempPkt+MTP2_LINK_NUMBER_OFFSET) = ((header->rec.mc_hdlc.mc_header>>16)&0x01);
+ *(TempPkt+MTP2_LINK_NUMBER_OFFSET+1) = ((header->rec.mc_hdlc.mc_header>>24)&0xff);
+ memcpy(TempPkt+MTP2_HDR_LEN, dp, caplen);
+ dp = TempPkt;
+ }
#endif
+ break;
+
+ case TYPE_IPV4:
+ case TYPE_IPV6:
+ packet_len = ntohs(header->wlen);
+ caplen = rlen - dag_record_size;
+ /* Skip over extension headers */
+ caplen -= (8 * num_ext_hdr);
+ if (caplen > packet_len) {
+ caplen = packet_len;
+ }
+ break;
+
+ /* These types have no matching 'native' DLT, but can be used with DLT_ERF above */
+ case TYPE_MC_RAW:
+ case TYPE_MC_RAW_CHANNEL:
+ case TYPE_IP_COUNTER:
+ case TYPE_TCP_FLOW_COUNTER:
+ case TYPE_INFINIBAND:
+ case TYPE_RAW_LINK:
+ case TYPE_INFINIBAND_LINK:
+ default:
+ /* Unhandled ERF type.
+ * Ignore rather than generating error
+ */
+ continue;
+ } /* switch type */
+
+ } /* ERF encapsulation */
+
+ if (caplen > p->snapshot)
+ caplen = p->snapshot;
+
+ /* Run the packet filter if there is one. */
+ if ((p->fcode.bf_insns == NULL) || bpf_filter(p->fcode.bf_insns, dp, packet_len, caplen)) {
+
+ /* convert between timestamp formats */
+ register unsigned long long ts;
+
+ if (IS_BIGENDIAN()) {
+ ts = SWAPLL(header->ts);
+ } else {
+ ts = header->ts;
+ }
+
+ switch (p->opt.tstamp_precision) {
+ case PCAP_TSTAMP_PRECISION_NANO:
+ ticks_per_second = 1000000000;
+ break;
+ case PCAP_TSTAMP_PRECISION_MICRO:
+ default:
+ ticks_per_second = 1000000;
+ break;
+
+ }
+ pcap_header.ts.tv_sec = ts >> 32;
+ ts = (ts & 0xffffffffULL) * ticks_per_second;
+ ts += 0x80000000; /* rounding */
+ pcap_header.ts.tv_usec = ts >> 32;
+ if (pcap_header.ts.tv_usec >= ticks_per_second) {
+ pcap_header.ts.tv_usec -= ticks_per_second;
+ pcap_header.ts.tv_sec++;
+ }
+
+ /* Fill in our own header data */
+ pcap_header.caplen = caplen;
+ pcap_header.len = packet_len;
+
+ /* Count the packet. */
+ pd->stat.ps_recv++;
+
+ /* Call the user supplied callback function */
+ callback(user, &pcap_header, dp);
+
+ /* Only count packets that pass the filter, for consistency with standard Linux behaviour. */
+ processed++;
+ if (processed == cnt && !PACKET_COUNT_IS_UNLIMITED(cnt))
+ {
+ /* Reached the user-specified limit. */
+ return cnt;
+ }
+ }
+ }
+
+ return processed;
}
-/*
- * Read at most max_packets from the capture stream and call the callback
- * for each of them. Returns the number of packets handled or -1 if an
- * error occured. A blocking
- */
-static int dag_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user) {
- u_char *dp = NULL;
- int packet_len = 0, caplen = 0;
- struct pcap_pkthdr pcap_header;
-
- dag_record_t *header;
- register unsigned long long ts;
-
- /* Receive a single packet from the kernel */
- header = get_next_dag_header(p);
- dp = ((u_char *)header) + dag_record_size;
-
- switch(header->type) {
- case TYPE_ATM:
- packet_len = ATM_CAPTURE_SIZE;
- caplen = ATM_CAPTURE_SIZE;
- break;
- case TYPE_ETH:
- packet_len = ntohs(header->wlen);
- caplen = ETHERNET_LENGTH(header);
- dp += 2;
- break;
- case TYPE_HDLC_POS:
- packet_len = ntohs(header->wlen);
- caplen = HDLC_LENGTH(header);
- break;
- }
-
- if (caplen > p->snapshot)
- caplen = p->snapshot;
-
- /* Run the packet filter if not using kernel filter */
- if (p->fcode.bf_insns) {
- if (bpf_filter(p->fcode.bf_insns, dp, packet_len, caplen) == 0) {
- /* rejected by filter */
- return 0;
- }
- }
-
- /* convert between timestamp formats */
- ts = swapll(header->ts);
- pcap_header.ts.tv_sec = ts >> 32;
- ts = ((ts & 0xffffffffULL) * 1000 * 1000);
- ts += (ts & 0x80000000ULL) << 1; /* rounding */
- pcap_header.ts.tv_usec = ts >> 32;
- if (pcap_header.ts.tv_usec >= 1000000) {
- pcap_header.ts.tv_usec -= 1000000;
- pcap_header.ts.tv_sec += 1;
- }
-
- /* Fill in our own header data */
- pcap_header.caplen = caplen;
- pcap_header.len = packet_len;
-
- /*
- * Count the packet.
- */
- p->md.stat.ps_recv++;
-
- /* Call the user supplied callback function */
- callback(user, &pcap_header, dp);
-
- return 1;
+static int
+dag_inject(pcap_t *p, const void *buf _U_, size_t size _U_)
+{
+ strlcpy(p->errbuf, "Sending packets isn't supported on DAG cards",
+ PCAP_ERRBUF_SIZE);
+ return (-1);
}
/*
* Get a handle for a live capture from the given DAG device. Passing a NULL
* device will result in a failure. The promisc flag is ignored because DAG
- * cards are always promiscuous. The to_ms parameter is also ignored as it is
- * not supported in hardware.
- *
+ * cards are always promiscuous. The to_ms parameter is used in setting the
+ * API polling parameters.
+ *
+ * snaplen is now also ignored, until we get per-stream slen support. Set
+ * slen with approprite DAG tool BEFORE pcap_activate().
+ *
* See also pcap(3).
*/
-pcap_t *dag_open_live(const char *device, int snaplen, int promisc, int to_ms, char *ebuf) {
- char conf[30]; /* dag configure string */
- pcap_t *handle;
-
- if (device == NULL) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE, "device is NULL: %s", pcap_strerror(errno));
- return NULL;
- }
- /* Allocate a handle for this session. */
-
- handle = malloc(sizeof(*handle));
- if (handle == NULL) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc %s: %s", device, pcap_strerror(errno));
- return NULL;
- }
-
- /* Initialize some components of the pcap structure. */
-
- memset(handle, 0, sizeof(*handle));
-
- if (strstr(device, "/dev") == NULL) {
- char * newDev = (char *)malloc(strlen(device) + 6);
- newDev[0] = '\0';
- strcat(newDev, "/dev/");
- strcat(newDev,device);
- device = newDev;
- }
-
- /* setup device parameters */
- if((handle->fd = dag_open((char *)device)) < 0) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE, "dag_open %s: %s", device, pcap_strerror(errno));
- return NULL;
- }
-
- /* set the card snap length as specified by the specified snaplen parameter */
- if (snaplen > MAX_DAG_SNAPLEN) {
- snaplen = MAX_DAG_SNAPLEN;
- }
- snprintf(conf, 30, "varlen slen=%d", (snaplen % 4) ? (snaplen + 3) & ~3 : snaplen); /* snap len has to be a multiple of 4 */
- fprintf(stderr, "Configuring DAG with '%s'.\n", conf);
- if(dag_configure(handle->fd, conf) < 0) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE,"dag_configure %s: %s\n", device, pcap_strerror(errno));
- return NULL;
- }
-
- if((handle->md.dag_mem_base = dag_mmap(handle->fd)) == MAP_FAILED) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE,"dag_mmap %s: %s\n", device, pcap_strerror(errno));
- return NULL;
- }
-
- if(dag_start(handle->fd) < 0) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE, "dag_start %s: %s\n", device, pcap_strerror(errno));
- return NULL;
- }
-
- /*
- * Important! You have to ensure bottom is properly
- * initialized to zero on startup, it won't give you
- * a compiler warning if you make this mistake!
- */
- handle->md.dag_mem_bottom = 0;
- handle->md.dag_mem_top = 0;
-
- handle->snapshot = snaplen;
- /*handle->md.timeout = to_ms; */
-
-#ifdef linux
- if (device) {
- handle->md.device = strdup(device);
- }
-
- if (handle->md.device == NULL) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE, "str_dup %s: %s\n", device, pcap_strerror(errno));
- free(handle);
- return NULL;
- }
-#endif
-
- /* set link type */
-
- /* Check the type through a dagapi call.
- */
- switch(dag_linktype(handle->fd)) {
- case TYPE_HDLC_POS:
- handle->linktype = DLT_CHDLC;
- fprintf(stderr, "Set DAG linktype to %d (DLT_CHDLC)\n", handle->linktype);
- break;
- case TYPE_ETH:
- handle->linktype = DLT_EN10MB;
- fprintf(stderr, "Set DAG linktype to %d (DLT_EN10MB)\n", handle->linktype);
- break;
- case TYPE_ATM:
- handle->linktype = DLT_ATM_RFC1483;
- fprintf(stderr, "Set DAG linktype to %d (DLT_ATM_RFC1483)\n", handle->linktype);
- break;
- case TYPE_LEGACY:
- handle->linktype = DLT_NULL;
- fprintf(stderr, "Set DAG linktype to %d (DLT_NULL)\n", handle->linktype);
- break;
- default:
- snprintf(ebuf, PCAP_ERRBUF_SIZE, "dag_open_live %s: unknown linktype %d\n", device, dag_linktype(handle->fd));
- return NULL;
- }
-
- handle->bufsize = 0;/*handle->snapshot;*/
-
- if (new_pcap_dag(handle) < 0) {
- snprintf(ebuf, PCAP_ERRBUF_SIZE, "new_pcap_dag %s: %s\n", device, pcap_strerror(errno));
- return NULL;
- }
-
- handle->read_op = dag_read;
- handle->setfilter_op = dag_setfilter;
- handle->set_datalink_op = dag_set_datalink;
- handle->stats_op = dag_stats;
- handle->close_op = dag_platform_close;
-
- return handle;
+static int dag_activate(pcap_t* handle)
+{
+ struct pcap_dag *handlep = handle->priv;
+#if 0
+ char conf[30]; /* dag configure string */
+#endif
+ char *s;
+ int n;
+ daginf_t* daginf;
+ char * newDev = NULL;
+ char * device = handle->opt.device;
+#ifdef HAVE_DAG_STREAMS_API
+ uint32_t mindata;
+ struct timeval maxwait;
+ struct timeval poll;
+#endif
+
+ if (device == NULL) {
+ pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "device is NULL: %s", pcap_strerror(errno));
+ return -1;
+ }
+
+ /* Initialize some components of the pcap structure. */
+
+#ifdef HAVE_DAG_STREAMS_API
+ newDev = (char *)malloc(strlen(device) + 16);
+ if (newDev == NULL) {
+ pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't allocate string for device name: %s", pcap_strerror(errno));
+ goto fail;
+ }
+
+ /* Parse input name to get dag device and stream number if provided */
+ if (dag_parse_name(device, newDev, strlen(device) + 16, &handlep->dag_stream) < 0) {
+ pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_parse_name: %s", pcap_strerror(errno));
+ goto fail;
+ }
+ device = newDev;
+
+ if (handlep->dag_stream%2) {
+ pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_parse_name: tx (even numbered) streams not supported for capture");
+ goto fail;
+ }
+#else
+ if (strncmp(device, "/dev/", 5) != 0) {
+ newDev = (char *)malloc(strlen(device) + 5);
+ if (newDev == NULL) {
+ pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't allocate string for device name: %s", pcap_strerror(errno));
+ goto fail;
+ }
+ strcpy(newDev, "/dev/");
+ strcat(newDev, device);
+ device = newDev;
+ }
+#endif /* HAVE_DAG_STREAMS_API */
+
+ /* setup device parameters */
+ if((handle->fd = dag_open((char *)device)) < 0) {
+ pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_open %s: %s", device, pcap_strerror(errno));
+ goto fail;
+ }
+
+#ifdef HAVE_DAG_STREAMS_API
+ /* Open requested stream. Can fail if already locked or on error */
+ if (dag_attach_stream(handle->fd, handlep->dag_stream, 0, 0) < 0) {
+ pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_attach_stream: %s", pcap_strerror(errno));
+ goto failclose;
+ }
+
+ /* Set up default poll parameters for stream
+ * Can be overridden by pcap_set_nonblock()
+ */
+ if (dag_get_stream_poll(handle->fd, handlep->dag_stream,
+ &mindata, &maxwait, &poll) < 0) {
+ pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_get_stream_poll: %s", pcap_strerror(errno));
+ goto faildetach;
+ }
+
+ if (handle->opt.immediate) {
+ /* Call callback immediately.
+ * XXX - is this the right way to handle this?
+ */
+ mindata = 0;
+ } else {
+ /* Amount of data to collect in Bytes before calling callbacks.
+ * Important for efficiency, but can introduce latency
+ * at low packet rates if to_ms not set!
+ */
+ mindata = 65536;
+ }
+
+ /* Obey opt.timeout (was to_ms) if supplied. This is a good idea!
+ * Recommend 10-100ms. Calls will time out even if no data arrived.
+ */
+ maxwait.tv_sec = handle->opt.timeout/1000;
+ maxwait.tv_usec = (handle->opt.timeout%1000) * 1000;
+
+ if (dag_set_stream_poll(handle->fd, handlep->dag_stream,
+ mindata, &maxwait, &poll) < 0) {
+ pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_set_stream_poll: %s", pcap_strerror(errno));
+ goto faildetach;
+ }
+
+#else
+ if((handlep->dag_mem_base = dag_mmap(handle->fd)) == MAP_FAILED) {
+ pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,"dag_mmap %s: %s", device, pcap_strerror(errno));
+ goto failclose;
+ }
+
+#endif /* HAVE_DAG_STREAMS_API */
+
+ /* XXX Not calling dag_configure() to set slen; this is unsafe in
+ * multi-stream environments as the gpp config is global.
+ * Once the firmware provides 'per-stream slen' this can be supported
+ * again via the Config API without side-effects */
+#if 0
+ /* set the card snap length to the specified snaplen parameter */
+ /* This is a really bad idea, as different cards have different
+ * valid slen ranges. Should fix in Config API. */
+ if (handle->snapshot == 0 || handle->snapshot > MAX_DAG_SNAPLEN) {
+ handle->snapshot = MAX_DAG_SNAPLEN;
+ } else if (snaplen < MIN_DAG_SNAPLEN) {
+ handle->snapshot = MIN_DAG_SNAPLEN;
+ }
+ /* snap len has to be a multiple of 4 */
+ pcap_snprintf(conf, 30, "varlen slen=%d", (snaplen + 3) & ~3);
+
+ if(dag_configure(handle->fd, conf) < 0) {
+ pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,"dag_configure %s: %s", device, pcap_strerror(errno));
+ goto faildetach;
+ }
+#endif
+
+#ifdef HAVE_DAG_STREAMS_API
+ if(dag_start_stream(handle->fd, handlep->dag_stream) < 0) {
+ pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_start_stream %s: %s", device, pcap_strerror(errno));
+ goto faildetach;
+ }
+#else
+ if(dag_start(handle->fd) < 0) {
+ pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_start %s: %s", device, pcap_strerror(errno));
+ goto failclose;
+ }
+#endif /* HAVE_DAG_STREAMS_API */
+
+ /*
+ * Important! You have to ensure bottom is properly
+ * initialized to zero on startup, it won't give you
+ * a compiler warning if you make this mistake!
+ */
+ handlep->dag_mem_bottom = 0;
+ handlep->dag_mem_top = 0;
+
+ /*
+ * Find out how many FCS bits we should strip.
+ * First, query the card to see if it strips the FCS.
+ */
+ daginf = dag_info(handle->fd);
+ if ((0x4200 == daginf->device_code) || (0x4230 == daginf->device_code)) {
+ /* DAG 4.2S and 4.23S already strip the FCS. Stripping the final word again truncates the packet. */
+ handlep->dag_fcs_bits = 0;
+
+ /* Note that no FCS will be supplied. */
+ handle->linktype_ext = LT_FCS_DATALINK_EXT(0);
+ } else {
+ /*
+ * Start out assuming it's 32 bits.
+ */
+ handlep->dag_fcs_bits = 32;
+
+ /* Allow an environment variable to override. */
+ if ((s = getenv("ERF_FCS_BITS")) != NULL) {
+ if ((n = atoi(s)) == 0 || n == 16 || n == 32) {
+ handlep->dag_fcs_bits = n;
+ } else {
+ pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+ "pcap_activate %s: bad ERF_FCS_BITS value (%d) in environment", device, n);
+ goto failstop;
+ }
+ }
+
+ /*
+ * Did the user request that they not be stripped?
+ */
+ if ((s = getenv("ERF_DONT_STRIP_FCS")) != NULL) {
+ /* Yes. Note the number of bytes that will be
+ supplied. */
+ handle->linktype_ext = LT_FCS_DATALINK_EXT(handlep->dag_fcs_bits/16);
+
+ /* And don't strip them. */
+ handlep->dag_fcs_bits = 0;
+ }
+ }
+
+ handlep->dag_timeout = handle->opt.timeout;
+
+ handle->linktype = -1;
+ if (dag_get_datalink(handle) < 0)
+ goto failstop;
+
+ handle->bufsize = 0;
+
+ if (new_pcap_dag(handle) < 0) {
+ pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "new_pcap_dag %s: %s", device, pcap_strerror(errno));
+ goto failstop;
+ }
+
+ /*
+ * "select()" and "poll()" don't work on DAG device descriptors.
+ */
+ handle->selectable_fd = -1;
+
+ if (newDev != NULL) {
+ free((char *)newDev);
+ }
+
+ handle->read_op = dag_read;
+ handle->inject_op = dag_inject;
+ handle->setfilter_op = dag_setfilter;
+ handle->setdirection_op = NULL; /* Not implemented.*/
+ handle->set_datalink_op = dag_set_datalink;
+ handle->getnonblock_op = pcap_getnonblock_fd;
+ handle->setnonblock_op = dag_setnonblock;
+ handle->stats_op = dag_stats;
+ handle->cleanup_op = dag_platform_cleanup;
+ handlep->stat.ps_drop = 0;
+ handlep->stat.ps_recv = 0;
+ handlep->stat.ps_ifdrop = 0;
+ return 0;
+
+#ifdef HAVE_DAG_STREAMS_API
+failstop:
+ if (dag_stop_stream(handle->fd, handlep->dag_stream) < 0) {
+ fprintf(stderr,"dag_stop_stream: %s\n", strerror(errno));
+ }
+
+faildetach:
+ if (dag_detach_stream(handle->fd, handlep->dag_stream) < 0)
+ fprintf(stderr,"dag_detach_stream: %s\n", strerror(errno));
+#else
+failstop:
+ if (dag_stop(handle->fd) < 0)
+ fprintf(stderr,"dag_stop: %s\n", strerror(errno));
+#endif /* HAVE_DAG_STREAMS_API */
+
+failclose:
+ if (dag_close(handle->fd) < 0)
+ fprintf(stderr,"dag_close: %s\n", strerror(errno));
+ delete_pcap_dag(handle);
+
+fail:
+ pcap_cleanup_live_common(handle);
+ if (newDev != NULL) {
+ free((char *)newDev);
+ }
+
+ return PCAP_ERROR;
+}
+
+pcap_t *dag_create(const char *device, char *ebuf, int *is_ours)
+{
+ const char *cp;
+ char *cpend;
+ long devnum;
+ pcap_t *p;
+#ifdef HAVE_DAG_STREAMS_API
+ long stream = 0;
+#endif
+
+ /* Does this look like a DAG device? */
+ cp = strrchr(device, '/');
+ if (cp == NULL)
+ cp = device;
+ /* Does it begin with "dag"? */
+ if (strncmp(cp, "dag", 3) != 0) {
+ /* Nope, doesn't begin with "dag" */
+ *is_ours = 0;
+ return NULL;
+ }
+ /* Yes - is "dag" followed by a number from 0 to DAG_MAX_BOARDS-1 */
+ cp += 3;
+ devnum = strtol(cp, &cpend, 10);
+#ifdef HAVE_DAG_STREAMS_API
+ if (*cpend == ':') {
+ /* Followed by a stream number. */
+ stream = strtol(++cpend, &cpend, 10);
+ }
+#endif
+ if (cpend == cp || *cpend != '\0') {
+ /* Not followed by a number. */
+ *is_ours = 0;
+ return NULL;
+ }
+ if (devnum < 0 || devnum >= DAG_MAX_BOARDS) {
+ /* Followed by a non-valid number. */
+ *is_ours = 0;
+ return NULL;
+ }
+#ifdef HAVE_DAG_STREAMS_API
+ if (stream <0 || stream >= DAG_STREAM_MAX) {
+ /* Followed by a non-valid stream number. */
+ *is_ours = 0;
+ return NULL;
+ }
+#endif
+
+ /* OK, it's probably ours. */
+ *is_ours = 1;
+
+ p = pcap_create_common(ebuf, sizeof (struct pcap_dag));
+ if (p == NULL)
+ return NULL;
+
+ p->activate_op = dag_activate;
+
+ /*
+ * We claim that we support microsecond and nanosecond time
+ * stamps.
+ *
+ * XXX Our native precision is 2^-32s, but libpcap doesn't support
+ * power of two precisions yet. We can convert to either MICRO or NANO.
+ */
+ p->tstamp_precision_count = 2;
+ p->tstamp_precision_list = malloc(2 * sizeof(u_int));
+ if (p->tstamp_precision_list == NULL) {
+ pcap_snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s",
+ pcap_strerror(errno));
+ pcap_close(p);
+ return NULL;
+ }
+ p->tstamp_precision_list[0] = PCAP_TSTAMP_PRECISION_MICRO;
+ p->tstamp_precision_list[1] = PCAP_TSTAMP_PRECISION_NANO;
+ return p;
}
-static int dag_stats(pcap_t *p, struct pcap_stat *ps) {
- /* This needs to be filled out correctly. Hopefully a dagapi call will
- provide all necessary information.
- */
- /*p->md.stat.ps_recv = 0;*/
- /*p->md.stat.ps_drop = 0;*/
-
- *ps = p->md.stat;
-
- return 0;
+static int
+dag_stats(pcap_t *p, struct pcap_stat *ps) {
+ struct pcap_dag *pd = p->priv;
+
+ /* This needs to be filled out correctly. Hopefully a dagapi call will
+ provide all necessary information.
+ */
+ /*pd->stat.ps_recv = 0;*/
+ /*pd->stat.ps_drop = 0;*/
+
+ *ps = pd->stat;
+
+ return 0;
}
/*
- * Get from "/proc/dag" all interfaces listed there; if they're
- * already in the list of interfaces we have, that won't add another
- * instance, but if they're not, that'll add them.
- *
- * We don't bother getting any addresses for them.
+ * Previously we just generated a list of all possible names and let
+ * pcap_add_if() attempt to open each one, but with streams this adds up
+ * to 81 possibilities which is inefficient.
*
- * We also don't fail if we couldn't open "/proc/dag"; we just leave
- * the list of interfaces as is.
+ * Since we know more about the devices we can prune the tree here.
+ * pcap_add_if() will still retest each device but the total number of
+ * open attempts will still be much less than the naive approach.
*/
int
-dag_platform_finddevs(pcap_if_t **devlistp, char *errbuf)
+dag_findalldevs(pcap_if_t **devlistp, char *errbuf)
{
- FILE *proc_dag_f;
- char linebuf[512];
- int linenum;
- unsigned char *p;
- char name[512]; /* XXX - pick a size */
- char *q, *saveq;
- struct ifreq ifrflags;
- int ret = 0;
-
- /* Quick exit if /proc/dag not readable */
- proc_dag_f = fopen("/proc/dag", "r");
- if (proc_dag_f == NULL)
- {
- int i, fd;
- char dev[16] = "dagx";
-
- for (i = '0'; ret == 0 && i <= '9'; i++) {
- dev[3] = i;
- if (pcap_add_if(devlistp, dev, 0, NULL, errbuf) == -1) {
- /*
- * Failure.
- */
- ret = -1;
- }
- }
-
- return (ret);
- }
-
- for (linenum = 1;
- fgets(linebuf, sizeof linebuf, proc_dag_f) != NULL; linenum++) {
-
- /*
- * Skip the first two lines - they're headers.
- */
- if (linenum <= 2)
- continue;
-
- p = &linebuf[0];
-
- if (*p == '\0' || *p == '\n' || *p != 'D')
- continue; /* not a Dag line */
-
- /*
- * Get the interface name.
- */
- q = &name[0];
- while (*p != '\0' && *p != ':') {
- if (*p != ' ')
- *q++ = tolower(*p++);
- else
- p++;
- }
- *q = '\0';
-
- /*
- * Add an entry for this interface, with no addresses.
- */
- p[strlen(p) - 1] = '\0'; /* get rid of \n */
- if (pcap_add_if(devlistp, name, 0, strdup(p + 2), errbuf) == -1) {
- /*
- * Failure.
- */
- ret = -1;
- break;
- }
- }
- if (ret != -1) {
- /*
- * Well, we didn't fail for any other reason; did we
- * fail due to an error reading the file?
- */
- if (ferror(proc_dag_f)) {
- (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
- "Error reading /proc/dag: %s",
- pcap_strerror(errno));
- ret = -1;
- }
- }
-
- (void)fclose(proc_dag_f);
- return (ret);
+ char name[12]; /* XXX - pick a size */
+ int ret = 0;
+ int c;
+ char dagname[DAGNAME_BUFSIZE];
+ int dagstream;
+ int dagfd;
+ dag_card_inf_t *inf;
+ char *description;
+
+ /* Try all the DAGs 0-DAG_MAX_BOARDS */
+ for (c = 0; c < DAG_MAX_BOARDS; c++) {
+ pcap_snprintf(name, 12, "dag%d", c);
+ if (-1 == dag_parse_name(name, dagname, DAGNAME_BUFSIZE, &dagstream))
+ {
+ return -1;
+ }
+ description = NULL;
+ if ( (dagfd = dag_open(dagname)) >= 0 ) {
+ if ((inf = dag_pciinfo(dagfd)))
+ description = dag_device_name(inf->device_code, 1);
+ if (pcap_add_if(devlistp, name, 0, description, errbuf) == -1) {
+ /*
+ * Failure.
+ */
+ ret = -1;
+ }
+#ifdef HAVE_DAG_STREAMS_API
+ {
+ int stream, rxstreams;
+ rxstreams = dag_rx_get_stream_count(dagfd);
+ for(stream=0;stream<DAG_STREAM_MAX;stream+=2) {
+ if (0 == dag_attach_stream(dagfd, stream, 0, 0)) {
+ dag_detach_stream(dagfd, stream);
+
+ pcap_snprintf(name, 10, "dag%d:%d", c, stream);
+ if (pcap_add_if(devlistp, name, 0, description, errbuf) == -1) {
+ /*
+ * Failure.
+ */
+ ret = -1;
+ }
+
+ rxstreams--;
+ if(rxstreams <= 0) {
+ break;
+ }
+ }
+ }
+ }
+#endif /* HAVE_DAG_STREAMS_API */
+ dag_close(dagfd);
+ }
+
+ }
+ return (ret);
}
/*
- * Installs the gven bpf filter program in the given pcap structure. There is
+ * Installs the given bpf filter program in the given pcap structure. There is
* no attempt to store the filter in kernel memory as that is not supported
* with DAG cards.
*/
-static int dag_setfilter(pcap_t *p, struct bpf_program *fp) {
- if (!p)
- return -1;
- if (!fp) {
- strncpy(p->errbuf, "setfilter: No filter specified",
- sizeof(p->errbuf));
- return -1;
- }
-
- /* Make our private copy of the filter */
-
- if (install_bpf_program(p, fp) < 0) {
- snprintf(p->errbuf, sizeof(p->errbuf),
- "malloc: %s", pcap_strerror(errno));
- return -1;
- }
-
- p->md.use_bpf = 0;
-
- return (0);
+static int
+dag_setfilter(pcap_t *p, struct bpf_program *fp)
+{
+ if (!p)
+ return -1;
+ if (!fp) {
+ strncpy(p->errbuf, "setfilter: No filter specified",
+ sizeof(p->errbuf));
+ return -1;
+ }
+
+ /* Make our private copy of the filter */
+
+ if (install_bpf_program(p, fp) < 0)
+ return -1;
+
+ return (0);
}
static int
dag_set_datalink(pcap_t *p, int dlt)
{
+ p->linktype = dlt;
+
+ return (0);
+}
+
+static int
+dag_setnonblock(pcap_t *p, int nonblock, char *errbuf)
+{
+ struct pcap_dag *pd = p->priv;
+
+ /*
+ * Set non-blocking mode on the FD.
+ * XXX - is that necessary? If not, don't bother calling it,
+ * and have a "dag_getnonblock()" function that looks at
+ * "pd->dag_offset_flags".
+ */
+ if (pcap_setnonblock_fd(p, nonblock, errbuf) < 0)
+ return (-1);
+#ifdef HAVE_DAG_STREAMS_API
+ {
+ uint32_t mindata;
+ struct timeval maxwait;
+ struct timeval poll;
+
+ if (dag_get_stream_poll(p->fd, pd->dag_stream,
+ &mindata, &maxwait, &poll) < 0) {
+ pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "dag_get_stream_poll: %s", pcap_strerror(errno));
+ return -1;
+ }
+
+ /* Amount of data to collect in Bytes before calling callbacks.
+ * Important for efficiency, but can introduce latency
+ * at low packet rates if to_ms not set!
+ */
+ if(nonblock)
+ mindata = 0;
+ else
+ mindata = 65536;
+
+ if (dag_set_stream_poll(p->fd, pd->dag_stream,
+ mindata, &maxwait, &poll) < 0) {
+ pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "dag_set_stream_poll: %s", pcap_strerror(errno));
+ return -1;
+ }
+ }
+#endif /* HAVE_DAG_STREAMS_API */
+ if (nonblock) {
+ pd->dag_offset_flags |= DAGF_NONBLOCK;
+ } else {
+ pd->dag_offset_flags &= ~DAGF_NONBLOCK;
+ }
+ return (0);
+}
+
+static int
+dag_get_datalink(pcap_t *p)
+{
+ struct pcap_dag *pd = p->priv;
+ int index=0, dlt_index=0;
+ uint8_t types[255];
+
+ memset(types, 0, 255);
+
+ if (p->dlt_list == NULL && (p->dlt_list = malloc(255*sizeof(*(p->dlt_list)))) == NULL) {
+ (void)pcap_snprintf(p->errbuf, sizeof(p->errbuf), "malloc: %s", pcap_strerror(errno));
+ return (-1);
+ }
+
+ p->linktype = 0;
+
+#ifdef HAVE_DAG_GET_STREAM_ERF_TYPES
+ /* Get list of possible ERF types for this card */
+ if (dag_get_stream_erf_types(p->fd, pd->dag_stream, types, 255) < 0) {
+ pcap_snprintf(p->errbuf, sizeof(p->errbuf), "dag_get_stream_erf_types: %s", pcap_strerror(errno));
+ return (-1);
+ }
+
+ while (types[index]) {
+
+#elif defined HAVE_DAG_GET_ERF_TYPES
+ /* Get list of possible ERF types for this card */
+ if (dag_get_erf_types(p->fd, types, 255) < 0) {
+ pcap_snprintf(p->errbuf, sizeof(p->errbuf), "dag_get_erf_types: %s", pcap_strerror(errno));
+ return (-1);
+ }
+
+ while (types[index]) {
+#else
+ /* Check the type through a dagapi call. */
+ types[index] = dag_linktype(p->fd);
+
+ {
+#endif
+ switch((types[index] & 0x7f)) {
+
+ case TYPE_HDLC_POS:
+ case TYPE_COLOR_HDLC_POS:
+ case TYPE_DSM_COLOR_HDLC_POS:
+ case TYPE_COLOR_HASH_POS:
+
+ if (p->dlt_list != NULL) {
+ p->dlt_list[dlt_index++] = DLT_CHDLC;
+ p->dlt_list[dlt_index++] = DLT_PPP_SERIAL;
+ p->dlt_list[dlt_index++] = DLT_FRELAY;
+ }
+ if(!p->linktype)
+ p->linktype = DLT_CHDLC;
+ break;
+
+ case TYPE_ETH:
+ case TYPE_COLOR_ETH:
+ case TYPE_DSM_COLOR_ETH:
+ case TYPE_COLOR_HASH_ETH:
+ /*
+ * This is (presumably) a real Ethernet capture; give it a
+ * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
+ * that an application can let you choose it, in case you're
+ * capturing DOCSIS traffic that a Cisco Cable Modem
+ * Termination System is putting out onto an Ethernet (it
+ * doesn't put an Ethernet header onto the wire, it puts raw
+ * DOCSIS frames out on the wire inside the low-level
+ * Ethernet framing).
+ */
+ if (p->dlt_list != NULL) {
+ p->dlt_list[dlt_index++] = DLT_EN10MB;
+ p->dlt_list[dlt_index++] = DLT_DOCSIS;
+ }
+ if(!p->linktype)
+ p->linktype = DLT_EN10MB;
+ break;
+
+ case TYPE_ATM:
+ case TYPE_AAL5:
+ case TYPE_MC_ATM:
+ case TYPE_MC_AAL5:
+ if (p->dlt_list != NULL) {
+ p->dlt_list[dlt_index++] = DLT_ATM_RFC1483;
+ p->dlt_list[dlt_index++] = DLT_SUNATM;
+ }
+ if(!p->linktype)
+ p->linktype = DLT_ATM_RFC1483;
+ break;
+
+ case TYPE_COLOR_MC_HDLC_POS:
+ case TYPE_MC_HDLC:
+ if (p->dlt_list != NULL) {
+ p->dlt_list[dlt_index++] = DLT_CHDLC;
+ p->dlt_list[dlt_index++] = DLT_PPP_SERIAL;
+ p->dlt_list[dlt_index++] = DLT_FRELAY;
+ p->dlt_list[dlt_index++] = DLT_MTP2;
+ p->dlt_list[dlt_index++] = DLT_MTP2_WITH_PHDR;
+ p->dlt_list[dlt_index++] = DLT_LAPD;
+ }
+ if(!p->linktype)
+ p->linktype = DLT_CHDLC;
+ break;
+
+ case TYPE_IPV4:
+ case TYPE_IPV6:
+ if(!p->linktype)
+ p->linktype = DLT_RAW;
+ break;
+
+ case TYPE_LEGACY:
+ case TYPE_MC_RAW:
+ case TYPE_MC_RAW_CHANNEL:
+ case TYPE_IP_COUNTER:
+ case TYPE_TCP_FLOW_COUNTER:
+ case TYPE_INFINIBAND:
+ case TYPE_RAW_LINK:
+ case TYPE_INFINIBAND_LINK:
+ default:
+ /* Libpcap cannot deal with these types yet */
+ /* Add no 'native' DLTs, but still covered by DLT_ERF */
+ break;
+
+ } /* switch */
+ index++;
+ }
+
+ p->dlt_list[dlt_index++] = DLT_ERF;
+
+ p->dlt_count = dlt_index;
+
+ if(!p->linktype)
+ p->linktype = DLT_ERF;
+
+ return p->linktype;
+}
+
+#ifdef DAG_ONLY
+/*
+ * This libpcap build supports only DAG cards, not regular network
+ * interfaces.
+ */
+
+/*
+ * There are no regular interfaces, just DAG interfaces.
+ */
+int
+pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
+{
+ *alldevsp = NULL;
return (0);
}
+
+/*
+ * Attempts to open a regular interface fail.
+ */
+pcap_t *
+pcap_create_interface(const char *device, char *errbuf)
+{
+ pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "This version of libpcap only supports DAG cards");
+ return NULL;
+}
+#endif
projects / libpcap / blobdiff