1 /* $NetBSD: pcap-dag.c,v 1.8 2024/09/02 15:33:37 christos Exp $ */
2
3 /*
4 * pcap-dag.c: Packet capture interface for Endace DAG cards.
5 *
6 * Authors: Richard Littin, Sean Irvine ({richard,sean}@reeltwo.com)
7 * Modifications: Jesper Peterson
8 * Koryn Grant
9 * Stephen Donnelly <stephen.donnelly@endace.com>
10 */
11
12 #include <sys/cdefs.h>
13 __RCSID("$NetBSD: pcap-dag.c,v 1.8 2024/09/02 15:33:37 christos Exp $");
14
15 #include <config.h>
16
17 #include <sys/param.h> /* optionally get BSD define */
18
19 #include <stdlib.h>
20 #include <string.h>
21 #include <errno.h>
22
23 #include "pcap-int.h"
24
25 #include <netinet/in.h>
26 #include <sys/mman.h>
27 #include <sys/socket.h>
28 #include <sys/types.h>
29 #include <unistd.h>
30
31 struct mbuf; /* Squelch compiler warnings on some platforms for */
32 struct rtentry; /* declarations in <net/if.h> */
33 #include <net/if.h>
34
35 #include "dagnew.h"
36 #include "dagapi.h"
37 #include "dagpci.h"
38 #include "dag_config_api.h"
39
40 #include "pcap-dag.h"
41
42 /*
43 * DAG devices have names beginning with "dag", followed by a number
44 * from 0 to DAG_MAX_BOARDS, then optionally a colon and a stream number
45 * from 0 to DAG_STREAM_MAX.
46 */
47 #ifndef DAG_MAX_BOARDS
48 #define DAG_MAX_BOARDS 32
49 #endif
50
51
52 #ifndef ERF_TYPE_AAL5
53 #define ERF_TYPE_AAL5 4
54 #endif
55
56 #ifndef ERF_TYPE_MC_HDLC
57 #define ERF_TYPE_MC_HDLC 5
58 #endif
59
60 #ifndef ERF_TYPE_MC_RAW
61 #define ERF_TYPE_MC_RAW 6
62 #endif
63
64 #ifndef ERF_TYPE_MC_ATM
65 #define ERF_TYPE_MC_ATM 7
66 #endif
67
68 #ifndef ERF_TYPE_MC_RAW_CHANNEL
69 #define ERF_TYPE_MC_RAW_CHANNEL 8
70 #endif
71
72 #ifndef ERF_TYPE_MC_AAL5
73 #define ERF_TYPE_MC_AAL5 9
74 #endif
75
76 #ifndef ERF_TYPE_COLOR_HDLC_POS
77 #define ERF_TYPE_COLOR_HDLC_POS 10
78 #endif
79
80 #ifndef ERF_TYPE_COLOR_ETH
81 #define ERF_TYPE_COLOR_ETH 11
82 #endif
83
84 #ifndef ERF_TYPE_MC_AAL2
85 #define ERF_TYPE_MC_AAL2 12
86 #endif
87
88 #ifndef ERF_TYPE_IP_COUNTER
89 #define ERF_TYPE_IP_COUNTER 13
90 #endif
91
92 #ifndef ERF_TYPE_TCP_FLOW_COUNTER
93 #define ERF_TYPE_TCP_FLOW_COUNTER 14
94 #endif
95
96 #ifndef ERF_TYPE_DSM_COLOR_HDLC_POS
97 #define ERF_TYPE_DSM_COLOR_HDLC_POS 15
98 #endif
99
100 #ifndef ERF_TYPE_DSM_COLOR_ETH
101 #define ERF_TYPE_DSM_COLOR_ETH 16
102 #endif
103
104 #ifndef ERF_TYPE_COLOR_MC_HDLC_POS
105 #define ERF_TYPE_COLOR_MC_HDLC_POS 17
106 #endif
107
108 #ifndef ERF_TYPE_AAL2
109 #define ERF_TYPE_AAL2 18
110 #endif
111
112 #ifndef ERF_TYPE_COLOR_HASH_POS
113 #define ERF_TYPE_COLOR_HASH_POS 19
114 #endif
115
116 #ifndef ERF_TYPE_COLOR_HASH_ETH
117 #define ERF_TYPE_COLOR_HASH_ETH 20
118 #endif
119
120 #ifndef ERF_TYPE_INFINIBAND
121 #define ERF_TYPE_INFINIBAND 21
122 #endif
123
124 #ifndef ERF_TYPE_IPV4
125 #define ERF_TYPE_IPV4 22
126 #endif
127
128 #ifndef ERF_TYPE_IPV6
129 #define ERF_TYPE_IPV6 23
130 #endif
131
132 #ifndef ERF_TYPE_RAW_LINK
133 #define ERF_TYPE_RAW_LINK 24
134 #endif
135
136 #ifndef ERF_TYPE_INFINIBAND_LINK
137 #define ERF_TYPE_INFINIBAND_LINK 25
138 #endif
139
140 #ifndef ERF_TYPE_META
141 #define ERF_TYPE_META 27
142 #endif
143
144 #ifndef ERF_TYPE_PAD
145 #define ERF_TYPE_PAD 48
146 #endif
147
148 #define ATM_CELL_SIZE 52
149 #define ATM_HDR_SIZE 4
150
151 /*
152 * A header containing additional MTP information.
153 */
154 #define MTP2_SENT_OFFSET 0 /* 1 byte */
155 #define MTP2_ANNEX_A_USED_OFFSET 1 /* 1 byte */
156 #define MTP2_LINK_NUMBER_OFFSET 2 /* 2 bytes */
157 #define MTP2_HDR_LEN 4 /* length of the header */
158
159 #define MTP2_ANNEX_A_NOT_USED 0
160 #define MTP2_ANNEX_A_USED 1
161 #define MTP2_ANNEX_A_USED_UNKNOWN 2
162
163 /* SunATM pseudo header */
164 struct sunatm_hdr {
165 unsigned char flags; /* destination and traffic type */
166 unsigned char vpi; /* VPI */
167 unsigned short vci; /* VCI */
168 };
169
170 /*
171 * Private data for capturing on DAG devices.
172 */
173 struct pcap_dag {
174 struct pcap_stat stat;
175 u_char *dag_mem_bottom; /* DAG card current memory bottom pointer */
176 u_char *dag_mem_top; /* DAG card current memory top pointer */
177 int dag_fcs_bits; /* Number of checksum bits from link layer */
178 int dag_flags; /* Flags */
179 int dag_stream; /* DAG stream number */
180 int dag_timeout; /* timeout specified to pcap_open_live.
181 * Same as in linux above, introduce
182 * generally? */
183 dag_card_ref_t dag_ref; /* DAG Configuration/Status API card reference */
184 dag_component_t dag_root; /* DAG CSAPI Root component */
185 attr_uuid_t drop_attr; /* DAG Stream Drop Attribute handle, if available */
186 struct timeval required_select_timeout;
187 /* Timeout caller must use in event loops */
188 };
189
190 typedef struct pcap_dag_node {
191 struct pcap_dag_node *next;
192 pcap_t *p;
193 pid_t pid;
194 } pcap_dag_node_t;
195
196 static pcap_dag_node_t *pcap_dags = NULL;
197 static int atexit_handler_installed = 0;
198 static const unsigned short endian_test_word = 0x0100;
199
200 #define IS_BIGENDIAN() (*((unsigned char *)&endian_test_word))
201
202 #define MAX_DAG_PACKET 65536
203
204 static unsigned char TempPkt[MAX_DAG_PACKET];
205
206 #ifndef HAVE_DAG_LARGE_STREAMS_API
207 #define dag_attach_stream64(a, b, c, d) dag_attach_stream(a, b, c, d)
208 #define dag_get_stream_poll64(a, b, c, d, e) dag_get_stream_poll(a, b, c, d, e)
209 #define dag_set_stream_poll64(a, b, c, d, e) dag_set_stream_poll(a, b, c, d, e)
210 #define dag_size_t uint32_t
211 #endif
212
213 static int dag_stats(pcap_t *p, struct pcap_stat *ps);
214 static int dag_set_datalink(pcap_t *p, int dlt);
215 static int dag_get_datalink(pcap_t *p);
216 static int dag_setnonblock(pcap_t *p, int nonblock);
217
218 static void
delete_pcap_dag(const pcap_t * p)219 delete_pcap_dag(const pcap_t *p)
220 {
221 pcap_dag_node_t *curr = NULL, *prev = NULL;
222
223 for (prev = NULL, curr = pcap_dags; curr != NULL && curr->p != p; prev = curr, curr = curr->next) {
224 /* empty */
225 }
226
227 if (curr != NULL && curr->p == p) {
228 if (prev != NULL) {
229 prev->next = curr->next;
230 } else {
231 pcap_dags = curr->next;
232 }
233 }
234 }
235
236 /*
237 * Performs a graceful shutdown of the DAG card, frees dynamic memory held
238 * in the pcap_t structure, and closes the file descriptor for the DAG card.
239 */
240
241 static void
dag_platform_cleanup(pcap_t * p)242 dag_platform_cleanup(pcap_t *p)
243 {
244 struct pcap_dag *pd = p->priv;
245
246 if(dag_stop_stream(p->fd, pd->dag_stream) < 0)
247 fprintf(stderr,"dag_stop_stream: %s\n", strerror(errno));
248
249 if(dag_detach_stream(p->fd, pd->dag_stream) < 0)
250 fprintf(stderr,"dag_detach_stream: %s\n", strerror(errno));
251
252 if(pd->dag_ref != NULL) {
253 dag_config_dispose(pd->dag_ref);
254 /*
255 * Note: we don't need to call close(p->fd) or
256 * dag_close(p->fd), as dag_config_dispose(pd->dag_ref)
257 * does this.
258 *
259 * Set p->fd to -1 to make sure that's not done.
260 */
261 p->fd = -1;
262 pd->dag_ref = NULL;
263 }
264 delete_pcap_dag(p);
265 pcapint_cleanup_live_common(p);
266 }
267
268 static void
atexit_handler(void)269 atexit_handler(void)
270 {
271 while (pcap_dags != NULL) {
272 if (pcap_dags->pid == getpid()) {
273 if (pcap_dags->p != NULL)
274 dag_platform_cleanup(pcap_dags->p);
275 } else {
276 delete_pcap_dag(pcap_dags->p);
277 }
278 }
279 }
280
281 static int
new_pcap_dag(pcap_t * p)282 new_pcap_dag(pcap_t *p)
283 {
284 pcap_dag_node_t *node = NULL;
285
286 if ((node = malloc(sizeof(pcap_dag_node_t))) == NULL) {
287 return -1;
288 }
289
290 if (!atexit_handler_installed) {
291 atexit(atexit_handler);
292 atexit_handler_installed = 1;
293 }
294
295 node->next = pcap_dags;
296 node->p = p;
297 node->pid = getpid();
298
299 pcap_dags = node;
300
301 return 0;
302 }
303
304 static unsigned int
dag_erf_ext_header_count(const uint8_t * erf,size_t len)305 dag_erf_ext_header_count(const uint8_t *erf, size_t len)
306 {
307 uint32_t hdr_num = 0;
308 uint8_t hdr_type;
309
310 /* basic sanity checks */
311 if ( erf == NULL )
312 return 0;
313 if ( len < 16 )
314 return 0;
315
316 /* check if we have any extension headers */
317 if ( (erf[8] & 0x80) == 0x00 )
318 return 0;
319
320 /* loop over the extension headers */
321 do {
322
323 /* sanity check we have enough bytes */
324 if ( len < (24 + (hdr_num * 8)) )
325 return hdr_num;
326
327 /* get the header type */
328 hdr_type = erf[(16 + (hdr_num * 8))];
329 hdr_num++;
330
331 } while ( hdr_type & 0x80 );
332
333 return hdr_num;
334 }
335
336 /*
337 * Read at most max_packets from the capture stream and call the callback
338 * for each of them. Returns the number of packets handled, -1 if an
339 * error occurred, or -2 if we were told to break out of the loop.
340 */
341 static int
dag_read(pcap_t * p,int cnt,pcap_handler callback,u_char * user)342 dag_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
343 {
344 struct pcap_dag *pd = p->priv;
345 unsigned int processed = 0;
346 unsigned int nonblocking = pd->dag_flags & DAGF_NONBLOCK;
347 unsigned int num_ext_hdr = 0;
348 unsigned int ticks_per_second;
349
350 /* Get the next bufferful of packets (if necessary). */
351 while (pd->dag_mem_top - pd->dag_mem_bottom < dag_record_size) {
352
353 /*
354 * Has "pcap_breakloop()" been called?
355 */
356 if (p->break_loop) {
357 /*
358 * Yes - clear the flag that indicates that
359 * it has, and return -2 to indicate that
360 * we were told to break out of the loop.
361 */
362 p->break_loop = 0;
363 return -2;
364 }
365
366 /* dag_advance_stream() will block (unless nonblock is called)
367 * until 64kB of data has accumulated.
368 * If to_ms is set, it will timeout before 64kB has accumulated.
369 * We wait for 64kB because processing a few packets at a time
370 * can cause problems at high packet rates (>200kpps) due
371 * to inefficiencies.
372 * This does mean if to_ms is not specified the capture may 'hang'
373 * for long periods if the data rate is extremely slow (<64kB/sec)
374 * If non-block is specified it will return immediately. The user
375 * is then responsible for efficiency.
376 */
377 if ( NULL == (pd->dag_mem_top = dag_advance_stream(p->fd, pd->dag_stream, &(pd->dag_mem_bottom))) ) {
378 return -1;
379 }
380
381 if (nonblocking && (pd->dag_mem_top - pd->dag_mem_bottom < dag_record_size))
382 {
383 /* Pcap is configured to process only available packets, and there aren't any, return immediately. */
384 return 0;
385 }
386
387 if(!nonblocking &&
388 pd->dag_timeout &&
389 (pd->dag_mem_top - pd->dag_mem_bottom < dag_record_size))
390 {
391 /* Blocking mode, but timeout set and no data has arrived, return anyway.*/
392 return 0;
393 }
394
395 }
396
397 /*
398 * Process the packets.
399 *
400 * This assumes that a single buffer of packets will have
401 * <= INT_MAX packets, so the packet count doesn't overflow.
402 */
403 while (pd->dag_mem_top - pd->dag_mem_bottom >= dag_record_size) {
404
405 unsigned short packet_len = 0;
406 int caplen = 0;
407 struct pcap_pkthdr pcap_header;
408
409 dag_record_t *header = (dag_record_t *)(pd->dag_mem_bottom);
410
411 u_char *dp = ((u_char *)header); /* + dag_record_size; */
412 unsigned short rlen;
413
414 /*
415 * Has "pcap_breakloop()" been called?
416 */
417 if (p->break_loop) {
418 /*
419 * Yes - clear the flag that indicates that
420 * it has, and return -2 to indicate that
421 * we were told to break out of the loop.
422 */
423 p->break_loop = 0;
424 return -2;
425 }
426
427 rlen = ntohs(header->rlen);
428 if (rlen < dag_record_size)
429 {
430 pcapint_strlcpy(p->errbuf, "dag_read: record too small",
431 PCAP_ERRBUF_SIZE);
432 return -1;
433 }
434 pd->dag_mem_bottom += rlen;
435
436 /* Count lost packets. */
437 switch((header->type & 0x7f)) {
438 /* in these types the color value overwrites the lctr */
439 case ERF_TYPE_COLOR_HDLC_POS:
440 case ERF_TYPE_COLOR_ETH:
441 case ERF_TYPE_DSM_COLOR_HDLC_POS:
442 case ERF_TYPE_DSM_COLOR_ETH:
443 case ERF_TYPE_COLOR_MC_HDLC_POS:
444 case ERF_TYPE_COLOR_HASH_ETH:
445 case ERF_TYPE_COLOR_HASH_POS:
446 break;
447
448 default:
449 if ( (pd->drop_attr == kNullAttributeUuid) && (header->lctr) ) {
450 pd->stat.ps_drop += ntohs(header->lctr);
451 }
452 }
453
454 if ((header->type & 0x7f) == ERF_TYPE_PAD) {
455 continue;
456 }
457
458 num_ext_hdr = dag_erf_ext_header_count(dp, rlen);
459
460 /* ERF encapsulation */
461 /* The Extensible Record Format is not dropped for this kind of encapsulation,
462 * and will be handled as a pseudo header by the decoding application.
463 * The information carried in the ERF header and in the optional subheader (if present)
464 * could be merged with the libpcap information, to offer a better decoding.
465 * The packet length is
466 * o the length of the packet on the link (header->wlen),
467 * o plus the length of the ERF header (dag_record_size), as the length of the
468 * pseudo header will be adjusted during the decoding,
469 * o plus the length of the optional subheader (if present).
470 *
471 * The capture length is header.rlen and the byte stuffing for alignment will be dropped
472 * if the capture length is greater than the packet length.
473 */
474 if (p->linktype == DLT_ERF) {
475 packet_len = ntohs(header->wlen) + dag_record_size;
476 caplen = rlen;
477 switch ((header->type & 0x7f)) {
478 case ERF_TYPE_MC_AAL5:
479 case ERF_TYPE_MC_ATM:
480 case ERF_TYPE_MC_HDLC:
481 case ERF_TYPE_MC_RAW_CHANNEL:
482 case ERF_TYPE_MC_RAW:
483 case ERF_TYPE_MC_AAL2:
484 case ERF_TYPE_COLOR_MC_HDLC_POS:
485 packet_len += 4; /* MC header */
486 break;
487
488 case ERF_TYPE_COLOR_HASH_ETH:
489 case ERF_TYPE_DSM_COLOR_ETH:
490 case ERF_TYPE_COLOR_ETH:
491 case ERF_TYPE_ETH:
492 packet_len += 2; /* ETH header */
493 break;
494 } /* switch type */
495
496 /* Include ERF extension headers */
497 packet_len += (8 * num_ext_hdr);
498
499 if (caplen > packet_len) {
500 caplen = packet_len;
501 }
502 } else {
503 /* Other kind of encapsulation according to the header Type */
504
505 /* Skip over generic ERF header */
506 dp += dag_record_size;
507 /* Skip over extension headers */
508 dp += 8 * num_ext_hdr;
509
510 switch((header->type & 0x7f)) {
511 case ERF_TYPE_ATM:
512 case ERF_TYPE_AAL5:
513 if ((header->type & 0x7f) == ERF_TYPE_AAL5) {
514 packet_len = ntohs(header->wlen);
515 caplen = rlen - dag_record_size;
516 }
517 case ERF_TYPE_MC_ATM:
518 if ((header->type & 0x7f) == ERF_TYPE_MC_ATM) {
519 caplen = packet_len = ATM_CELL_SIZE;
520 dp+=4;
521 }
522 case ERF_TYPE_MC_AAL5:
523 if ((header->type & 0x7f) == ERF_TYPE_MC_AAL5) {
524 packet_len = ntohs(header->wlen);
525 caplen = rlen - dag_record_size - 4;
526 dp+=4;
527 }
528 /* Skip over extension headers */
529 caplen -= (8 * num_ext_hdr);
530
531 if ((header->type & 0x7f) == ERF_TYPE_ATM) {
532 caplen = packet_len = ATM_CELL_SIZE;
533 }
534 if (p->linktype == DLT_SUNATM) {
535 struct sunatm_hdr *sunatm = (struct sunatm_hdr *)dp;
536 unsigned long rawatm;
537
538 rawatm = ntohl(*((unsigned long *)dp));
539 sunatm->vci = htons((rawatm >> 4) & 0xffff);
540 sunatm->vpi = (rawatm >> 20) & 0x00ff;
541 sunatm->flags = ((header->flags.iface & 1) ? 0x80 : 0x00) |
542 ((sunatm->vpi == 0 && sunatm->vci == htons(5)) ? 6 :
543 ((sunatm->vpi == 0 && sunatm->vci == htons(16)) ? 5 :
544 ((dp[ATM_HDR_SIZE] == 0xaa &&
545 dp[ATM_HDR_SIZE+1] == 0xaa &&
546 dp[ATM_HDR_SIZE+2] == 0x03) ? 2 : 1)));
547
548 } else if (p->linktype == DLT_ATM_RFC1483) {
549 packet_len -= ATM_HDR_SIZE;
550 caplen -= ATM_HDR_SIZE;
551 dp += ATM_HDR_SIZE;
552 } else
553 continue;
554 break;
555
556 case ERF_TYPE_COLOR_HASH_ETH:
557 case ERF_TYPE_DSM_COLOR_ETH:
558 case ERF_TYPE_COLOR_ETH:
559 case ERF_TYPE_ETH:
560 if ((p->linktype != DLT_EN10MB) &&
561 (p->linktype != DLT_DOCSIS))
562 continue;
563 packet_len = ntohs(header->wlen);
564 packet_len -= (pd->dag_fcs_bits >> 3);
565 caplen = rlen - dag_record_size - 2;
566 /* Skip over extension headers */
567 caplen -= (8 * num_ext_hdr);
568 if (caplen > packet_len) {
569 caplen = packet_len;
570 }
571 dp += 2;
572 break;
573
574 case ERF_TYPE_COLOR_HASH_POS:
575 case ERF_TYPE_DSM_COLOR_HDLC_POS:
576 case ERF_TYPE_COLOR_HDLC_POS:
577 case ERF_TYPE_HDLC_POS:
578 if ((p->linktype != DLT_CHDLC) &&
579 (p->linktype != DLT_PPP_SERIAL) &&
580 (p->linktype != DLT_FRELAY))
581 continue;
582 packet_len = ntohs(header->wlen);
583 packet_len -= (pd->dag_fcs_bits >> 3);
584 caplen = rlen - dag_record_size;
585 /* Skip over extension headers */
586 caplen -= (8 * num_ext_hdr);
587 if (caplen > packet_len) {
588 caplen = packet_len;
589 }
590 break;
591
592 case ERF_TYPE_COLOR_MC_HDLC_POS:
593 case ERF_TYPE_MC_HDLC:
594 if ((p->linktype != DLT_CHDLC) &&
595 (p->linktype != DLT_PPP_SERIAL) &&
596 (p->linktype != DLT_FRELAY) &&
597 (p->linktype != DLT_MTP2) &&
598 (p->linktype != DLT_MTP2_WITH_PHDR) &&
599 (p->linktype != DLT_LAPD))
600 continue;
601 packet_len = ntohs(header->wlen);
602 packet_len -= (pd->dag_fcs_bits >> 3);
603 caplen = rlen - dag_record_size - 4;
604 /* Skip over extension headers */
605 caplen -= (8 * num_ext_hdr);
606 if (caplen > packet_len) {
607 caplen = packet_len;
608 }
609 /* jump the MC_HDLC_HEADER */
610 dp += 4;
611 #ifdef DLT_MTP2_WITH_PHDR
612 if (p->linktype == DLT_MTP2_WITH_PHDR) {
613 /* Add the MTP2 Pseudo Header */
614 caplen += MTP2_HDR_LEN;
615 packet_len += MTP2_HDR_LEN;
616
617 TempPkt[MTP2_SENT_OFFSET] = 0;
618 TempPkt[MTP2_ANNEX_A_USED_OFFSET] = MTP2_ANNEX_A_USED_UNKNOWN;
619 *(TempPkt+MTP2_LINK_NUMBER_OFFSET) = ((header->rec.mc_hdlc.mc_header>>16)&0x01);
620 *(TempPkt+MTP2_LINK_NUMBER_OFFSET+1) = ((header->rec.mc_hdlc.mc_header>>24)&0xff);
621 memcpy(TempPkt+MTP2_HDR_LEN, dp, caplen);
622 dp = TempPkt;
623 }
624 #endif
625 break;
626
627 case ERF_TYPE_IPV4:
628 if ((p->linktype != DLT_RAW) &&
629 (p->linktype != DLT_IPV4))
630 continue;
631 packet_len = ntohs(header->wlen);
632 caplen = rlen - dag_record_size;
633 /* Skip over extension headers */
634 caplen -= (8 * num_ext_hdr);
635 if (caplen > packet_len) {
636 caplen = packet_len;
637 }
638 break;
639
640 case ERF_TYPE_IPV6:
641 if ((p->linktype != DLT_RAW) &&
642 (p->linktype != DLT_IPV6))
643 continue;
644 packet_len = ntohs(header->wlen);
645 caplen = rlen - dag_record_size;
646 /* Skip over extension headers */
647 caplen -= (8 * num_ext_hdr);
648 if (caplen > packet_len) {
649 caplen = packet_len;
650 }
651 break;
652
653 /* These types have no matching 'native' DLT, but can be used with DLT_ERF above */
654 case ERF_TYPE_MC_RAW:
655 case ERF_TYPE_MC_RAW_CHANNEL:
656 case ERF_TYPE_IP_COUNTER:
657 case ERF_TYPE_TCP_FLOW_COUNTER:
658 case ERF_TYPE_INFINIBAND:
659 case ERF_TYPE_RAW_LINK:
660 case ERF_TYPE_INFINIBAND_LINK:
661 default:
662 /* Unhandled ERF type.
663 * Ignore rather than generating error
664 */
665 continue;
666 } /* switch type */
667
668 } /* ERF encapsulation */
669
670 if (caplen > p->snapshot)
671 caplen = p->snapshot;
672
673 /* Run the packet filter if there is one. */
674 if ((p->fcode.bf_insns == NULL) || pcapint_filter(p->fcode.bf_insns, dp, packet_len, caplen)) {
675
676 /* convert between timestamp formats */
677 register unsigned long long ts;
678
679 if (IS_BIGENDIAN()) {
680 ts = SWAPLL(header->ts);
681 } else {
682 ts = header->ts;
683 }
684
685 switch (p->opt.tstamp_precision) {
686 case PCAP_TSTAMP_PRECISION_NANO:
687 ticks_per_second = 1000000000;
688 break;
689 case PCAP_TSTAMP_PRECISION_MICRO:
690 default:
691 ticks_per_second = 1000000;
692 break;
693
694 }
695 pcap_header.ts.tv_sec = ts >> 32;
696 ts = (ts & 0xffffffffULL) * ticks_per_second;
697 ts += 0x80000000; /* rounding */
698 pcap_header.ts.tv_usec = ts >> 32;
699 if (pcap_header.ts.tv_usec >= ticks_per_second) {
700 pcap_header.ts.tv_usec -= ticks_per_second;
701 pcap_header.ts.tv_sec++;
702 }
703
704 /* Fill in our own header data */
705 pcap_header.caplen = caplen;
706 pcap_header.len = packet_len;
707
708 /* Count the packet. */
709 pd->stat.ps_recv++;
710
711 /* Call the user supplied callback function */
712 callback(user, &pcap_header, dp);
713
714 /* Only count packets that pass the filter, for consistency with standard Linux behaviour. */
715 processed++;
716 if (processed == cnt && !PACKET_COUNT_IS_UNLIMITED(cnt))
717 {
718 /* Reached the user-specified limit. */
719 return cnt;
720 }
721 }
722 }
723
724 return processed;
725 }
726
727 static int
dag_inject(pcap_t * p,const void * buf _U_,int size _U_)728 dag_inject(pcap_t *p, const void *buf _U_, int size _U_)
729 {
730 pcapint_strlcpy(p->errbuf, "Sending packets isn't supported on DAG cards",
731 PCAP_ERRBUF_SIZE);
732 return (-1);
733 }
734
735 /*
736 * Get a handle for a live capture from the given DAG device. Passing a NULL
737 * device will result in a failure. The promisc flag is ignored because DAG
738 * cards are always promiscuous. The to_ms parameter is used in setting the
739 * API polling parameters.
740 *
741 * snaplen is now also ignored, until we get per-stream slen support. Set
742 * slen with appropriate DAG tool BEFORE pcap_activate().
743 *
744 * See also pcap(3).
745 */
dag_activate(pcap_t * p)746 static int dag_activate(pcap_t* p)
747 {
748 struct pcap_dag *pd = p->priv;
749 char *s;
750 int n;
751 daginf_t* daginf;
752 char * newDev = NULL;
753 char * device = p->opt.device;
754 int ret;
755 dag_size_t mindata;
756 struct timeval maxwait;
757 struct timeval poll;
758
759 if (device == NULL) {
760 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "device is NULL");
761 return PCAP_ERROR;
762 }
763
764 /* Initialize some components of the pcap structure. */
765 newDev = (char *)malloc(strlen(device) + 16);
766 if (newDev == NULL) {
767 ret = PCAP_ERROR;
768 pcapint_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
769 errno, "Can't allocate string for device name");
770 goto fail;
771 }
772
773 /* Parse input name to get dag device and stream number if provided */
774 if (dag_parse_name(device, newDev, strlen(device) + 16, &pd->dag_stream) < 0) {
775 /*
776 * XXX - it'd be nice if this indicated what was wrong
777 * with the name. Does this reliably set errno?
778 * Should this return PCAP_ERROR_NO_SUCH_DEVICE in some
779 * cases?
780 */
781 ret = PCAP_ERROR;
782 pcapint_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
783 errno, "dag_parse_name");
784 goto fail;
785 }
786 device = newDev;
787
788 if (pd->dag_stream%2) {
789 ret = PCAP_ERROR;
790 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "dag_parse_name: tx (even numbered) streams not supported for capture");
791 goto fail;
792 }
793
794 /* setup device parameters */
795 if((pd->dag_ref = dag_config_init((char *)device)) == NULL) {
796 /*
797 * XXX - does this reliably set errno?
798 */
799 if (errno == ENOENT) {
800 /*
801 * There's nothing more to say, so clear
802 * the error message.
803 */
804 ret = PCAP_ERROR_NO_SUCH_DEVICE;
805 p->errbuf[0] = '\0';
806 } else if (errno == EPERM || errno == EACCES) {
807 ret = PCAP_ERROR_PERM_DENIED;
808 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
809 "Attempt to open %s failed with %s - additional privileges may be required",
810 device, (errno == EPERM) ? "EPERM" : "EACCES");
811 } else {
812 ret = PCAP_ERROR;
813 pcapint_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
814 errno, "dag_config_init %s", device);
815 }
816 goto fail;
817 }
818
819 if((p->fd = dag_config_get_card_fd(pd->dag_ref)) < 0) {
820 /*
821 * XXX - does this reliably set errno?
822 */
823 ret = PCAP_ERROR;
824 pcapint_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
825 errno, "dag_config_get_card_fd %s", device);
826 goto failclose;
827 }
828
829 /* Open requested stream. Can fail if already locked or on error */
830 if (dag_attach_stream64(p->fd, pd->dag_stream, 0, 0) < 0) {
831 ret = PCAP_ERROR;
832 pcapint_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
833 errno, "dag_attach_stream");
834 goto failclose;
835 }
836
837 /* Try to find Stream Drop attribute */
838 pd->drop_attr = kNullAttributeUuid;
839 pd->dag_root = dag_config_get_root_component(pd->dag_ref);
840 if ( dag_component_get_subcomponent(pd->dag_root, kComponentStreamFeatures, 0) )
841 {
842 pd->drop_attr = dag_config_get_indexed_attribute_uuid(pd->dag_ref, kUint32AttributeStreamDropCount, pd->dag_stream/2);
843 }
844
845 /* Set up default poll parameters for stream
846 * Can be overridden by pcap_set_nonblock()
847 */
848 if (dag_get_stream_poll64(p->fd, pd->dag_stream,
849 &mindata, &maxwait, &poll) < 0) {
850 ret = PCAP_ERROR;
851 pcapint_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
852 errno, "dag_get_stream_poll");
853 goto faildetach;
854 }
855
856 /* Use the poll time as the required select timeout for callers
857 * who are using select()/etc. in an event loop waiting for
858 * packets to arrive.
859 */
860 pd->required_select_timeout = poll;
861 p->required_select_timeout = &pd->required_select_timeout;
862
863 /*
864 * Turn a negative snapshot value (invalid), a snapshot value of
865 * 0 (unspecified), or a value bigger than the normal maximum
866 * value, into the maximum allowed value.
867 *
868 * If some application really *needs* a bigger snapshot
869 * length, we should just increase MAXIMUM_SNAPLEN.
870 */
871 if (p->snapshot <= 0 || p->snapshot > MAXIMUM_SNAPLEN)
872 p->snapshot = MAXIMUM_SNAPLEN;
873
874 if (p->opt.immediate) {
875 /* Call callback immediately.
876 * XXX - is this the right way to p this?
877 */
878 mindata = 0;
879 } else {
880 /* Amount of data to collect in Bytes before calling callbacks.
881 * Important for efficiency, but can introduce latency
882 * at low packet rates if to_ms not set!
883 */
884 mindata = 65536;
885 }
886
887 /* Obey opt.timeout (was to_ms) if supplied. This is a good idea!
888 * Recommend 10-100ms. Calls will time out even if no data arrived.
889 */
890 maxwait.tv_sec = p->opt.timeout/1000;
891 maxwait.tv_usec = (p->opt.timeout%1000) * 1000;
892
893 if (dag_set_stream_poll64(p->fd, pd->dag_stream,
894 mindata, &maxwait, &poll) < 0) {
895 ret = PCAP_ERROR;
896 pcapint_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
897 errno, "dag_set_stream_poll");
898 goto faildetach;
899 }
900
901 /* XXX Not calling dag_configure() to set slen; this is unsafe in
902 * multi-stream environments as the gpp config is global.
903 * Once the firmware provides 'per-stream slen' this can be supported
904 * again via the Config API without side-effects */
905 #if 0
906 /* set the card snap length to the specified snaplen parameter */
907 /* This is a really bad idea, as different cards have different
908 * valid slen ranges. Should fix in Config API. */
909 if (p->snapshot == 0 || p->snapshot > MAX_DAG_SNAPLEN) {
910 p->snapshot = MAX_DAG_SNAPLEN;
911 } else if (snaplen < MIN_DAG_SNAPLEN) {
912 p->snapshot = MIN_DAG_SNAPLEN;
913 }
914 /* snap len has to be a multiple of 4 */
915 #endif
916
917 if(dag_start_stream(p->fd, pd->dag_stream) < 0) {
918 ret = PCAP_ERROR;
919 pcapint_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
920 errno, "dag_start_stream %s", device);
921 goto faildetach;
922 }
923
924 /*
925 * Important! You have to ensure bottom is properly
926 * initialized to zero on startup, it won't give you
927 * a compiler warning if you make this mistake!
928 */
929 pd->dag_mem_bottom = 0;
930 pd->dag_mem_top = 0;
931
932 /*
933 * Find out how many FCS bits we should strip.
934 * First, query the card to see if it strips the FCS.
935 */
936 daginf = dag_info(p->fd);
937 if ((0x4200 == daginf->device_code) || (0x4230 == daginf->device_code)) {
938 /* DAG 4.2S and 4.23S already strip the FCS. Stripping the final word again truncates the packet. */
939 pd->dag_fcs_bits = 0;
940
941 /* Note that no FCS will be supplied. */
942 p->linktype_ext = LT_FCS_DATALINK_EXT(0);
943 } else {
944 /*
945 * Start out assuming it's 32 bits.
946 */
947 pd->dag_fcs_bits = 32;
948
949 /* Allow an environment variable to override. */
950 if ((s = getenv("ERF_FCS_BITS")) != NULL) {
951 if ((n = atoi(s)) == 0 || n == 16 || n == 32) {
952 pd->dag_fcs_bits = n;
953 } else {
954 ret = PCAP_ERROR;
955 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
956 "pcap_activate %s: bad ERF_FCS_BITS value (%d) in environment", device, n);
957 goto failstop;
958 }
959 }
960
961 /*
962 * Did the user request that they not be stripped?
963 */
964 if ((s = getenv("ERF_DONT_STRIP_FCS")) != NULL) {
965 /* Yes. Note the number of 16-bit words that will be
966 supplied. */
967 p->linktype_ext = LT_FCS_DATALINK_EXT(pd->dag_fcs_bits/16);
968
969 /* And don't strip them. */
970 pd->dag_fcs_bits = 0;
971 }
972 }
973
974 pd->dag_timeout = p->opt.timeout;
975
976 p->linktype = -1;
977 if (dag_get_datalink(p) < 0) {
978 ret = PCAP_ERROR;
979 goto failstop;
980 }
981
982 p->bufsize = 0;
983
984 if (new_pcap_dag(p) < 0) {
985 ret = PCAP_ERROR;
986 pcapint_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
987 errno, "new_pcap_dag %s", device);
988 goto failstop;
989 }
990
991 /*
992 * "select()" and "poll()" don't work on DAG device descriptors.
993 */
994 p->selectable_fd = -1;
995
996 if (newDev != NULL) {
997 free((char *)newDev);
998 }
999
1000 p->read_op = dag_read;
1001 p->inject_op = dag_inject;
1002 p->setfilter_op = pcapint_install_bpf_program;
1003 p->setdirection_op = NULL; /* Not implemented.*/
1004 p->set_datalink_op = dag_set_datalink;
1005 p->getnonblock_op = pcapint_getnonblock_fd;
1006 p->setnonblock_op = dag_setnonblock;
1007 p->stats_op = dag_stats;
1008 p->cleanup_op = dag_platform_cleanup;
1009 pd->stat.ps_drop = 0;
1010 pd->stat.ps_recv = 0;
1011 pd->stat.ps_ifdrop = 0;
1012 return 0;
1013
1014 failstop:
1015 if (dag_stop_stream(p->fd, pd->dag_stream) < 0) {
1016 fprintf(stderr,"dag_stop_stream: %s\n", strerror(errno));
1017 }
1018
1019 faildetach:
1020 if (dag_detach_stream(p->fd, pd->dag_stream) < 0)
1021 fprintf(stderr,"dag_detach_stream: %s\n", strerror(errno));
1022
1023 failclose:
1024 dag_config_dispose(pd->dag_ref);
1025 /*
1026 * Note: we don't need to call close(p->fd) or dag_close(p->fd),
1027 * as dag_config_dispose(pd->dag_ref) does this.
1028 *
1029 * Set p->fd to -1 to make sure that's not done.
1030 */
1031 p->fd = -1;
1032 pd->dag_ref = NULL;
1033 delete_pcap_dag(p);
1034
1035 fail:
1036 pcapint_cleanup_live_common(p);
1037 if (newDev != NULL) {
1038 free((char *)newDev);
1039 }
1040
1041 return ret;
1042 }
1043
dag_create(const char * device,char * ebuf,int * is_ours)1044 pcap_t *dag_create(const char *device, char *ebuf, int *is_ours)
1045 {
1046 const char *cp;
1047 char *cpend;
1048 long devnum;
1049 pcap_t *p;
1050 long stream = 0;
1051
1052 /* Does this look like a DAG device? */
1053 cp = strrchr(device, '/');
1054 if (cp == NULL)
1055 cp = device;
1056 /* Does it begin with "dag"? */
1057 if (strncmp(cp, "dag", 3) != 0) {
1058 /* Nope, doesn't begin with "dag" */
1059 *is_ours = 0;
1060 return NULL;
1061 }
1062 /* Yes - is "dag" followed by a number from 0 to DAG_MAX_BOARDS-1 */
1063 cp += 3;
1064 devnum = strtol(cp, &cpend, 10);
1065 if (*cpend == ':') {
1066 /* Followed by a stream number. */
1067 stream = strtol(++cpend, &cpend, 10);
1068 }
1069
1070 if (cpend == cp || *cpend != '\0') {
1071 /* Not followed by a number. */
1072 *is_ours = 0;
1073 return NULL;
1074 }
1075
1076 if (devnum < 0 || devnum >= DAG_MAX_BOARDS) {
1077 /* Followed by a non-valid number. */
1078 *is_ours = 0;
1079 return NULL;
1080 }
1081
1082 if (stream <0 || stream >= DAG_STREAM_MAX) {
1083 /* Followed by a non-valid stream number. */
1084 *is_ours = 0;
1085 return NULL;
1086 }
1087
1088 /* OK, it's probably ours. */
1089 *is_ours = 1;
1090
1091 p = PCAP_CREATE_COMMON(ebuf, struct pcap_dag);
1092 if (p == NULL)
1093 return NULL;
1094
1095 p->activate_op = dag_activate;
1096
1097 /*
1098 * We claim that we support microsecond and nanosecond time
1099 * stamps.
1100 *
1101 * XXX Our native precision is 2^-32s, but libpcap doesn't support
1102 * power of two precisions yet. We can convert to either MICRO or NANO.
1103 */
1104 p->tstamp_precision_list = malloc(2 * sizeof(u_int));
1105 if (p->tstamp_precision_list == NULL) {
1106 pcapint_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1107 errno, "malloc");
1108 pcap_close(p);
1109 return NULL;
1110 }
1111 p->tstamp_precision_list[0] = PCAP_TSTAMP_PRECISION_MICRO;
1112 p->tstamp_precision_list[1] = PCAP_TSTAMP_PRECISION_NANO;
1113 p->tstamp_precision_count = 2;
1114 return p;
1115 }
1116
1117 static int
dag_stats(pcap_t * p,struct pcap_stat * ps)1118 dag_stats(pcap_t *p, struct pcap_stat *ps) {
1119 struct pcap_dag *pd = p->priv;
1120 uint32_t stream_drop;
1121 dag_err_t dag_error;
1122
1123 /*
1124 * Packet records received (ps_recv) are counted in dag_read().
1125 * Packet records dropped (ps_drop) are read from Stream Drop attribute if present,
1126 * otherwise integrate the ERF Header lctr counts (if available) in dag_read().
1127 * We are reporting that no records are dropped by the card/driver (ps_ifdrop).
1128 */
1129
1130 if(pd->drop_attr != kNullAttributeUuid) {
1131 /* Note this counter is cleared at start of capture and will wrap at UINT_MAX.
1132 * The application is responsible for polling ps_drop frequently enough
1133 * to detect each wrap and integrate total drop with a wider counter */
1134 if ((dag_error = dag_config_get_uint32_attribute_ex(pd->dag_ref, pd->drop_attr, &stream_drop)) == kDagErrNone) {
1135 pd->stat.ps_drop = stream_drop;
1136 } else {
1137 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "reading stream drop attribute: %s",
1138 dag_config_strerror(dag_error));
1139 return -1;
1140 }
1141 }
1142
1143 *ps = pd->stat;
1144
1145 return 0;
1146 }
1147
1148 /*
1149 * Add all DAG devices.
1150 */
1151 int
dag_findalldevs(pcap_if_list_t * devlistp,char * errbuf)1152 dag_findalldevs(pcap_if_list_t *devlistp, char *errbuf)
1153 {
1154 char name[12]; /* XXX - pick a size */
1155 int c;
1156 char dagname[DAGNAME_BUFSIZE];
1157 int dagstream;
1158 int dagfd;
1159 dag_card_inf_t *inf;
1160 char *description;
1161 int stream, rxstreams;
1162
1163 /* Try all the DAGs 0-DAG_MAX_BOARDS */
1164 for (c = 0; c < DAG_MAX_BOARDS; c++) {
1165 snprintf(name, 12, "dag%d", c);
1166 if (-1 == dag_parse_name(name, dagname, DAGNAME_BUFSIZE, &dagstream))
1167 {
1168 (void) snprintf(errbuf, PCAP_ERRBUF_SIZE,
1169 "dag: device name %s can't be parsed", name);
1170 return (-1);
1171 }
1172 if ( (dagfd = dag_open(dagname)) >= 0 ) {
1173 description = NULL;
1174 if ((inf = dag_pciinfo(dagfd)))
1175 description = dag_device_name(inf->device_code, 1);
1176 /*
1177 * XXX - is there a way to determine whether
1178 * the card is plugged into a network or not?
1179 * If so, we should check that and set
1180 * PCAP_IF_CONNECTION_STATUS_CONNECTED or
1181 * PCAP_IF_CONNECTION_STATUS_DISCONNECTED.
1182 *
1183 * Also, are there notions of "up" and "running"?
1184 */
1185 if (pcapint_add_dev(devlistp, name, 0, description, errbuf) == NULL) {
1186 /*
1187 * Failure.
1188 */
1189 return (-1);
1190 }
1191 rxstreams = dag_rx_get_stream_count(dagfd);
1192 for(stream=0;stream<DAG_STREAM_MAX;stream+=2) {
1193 if (0 == dag_attach_stream64(dagfd, stream, 0, 0)) {
1194 dag_detach_stream(dagfd, stream);
1195
1196 snprintf(name, 10, "dag%d:%d", c, stream);
1197 if (pcapint_add_dev(devlistp, name, 0, description, errbuf) == NULL) {
1198 /*
1199 * Failure.
1200 */
1201 return (-1);
1202 }
1203
1204 rxstreams--;
1205 if(rxstreams <= 0) {
1206 break;
1207 }
1208 }
1209 }
1210 dag_close(dagfd);
1211 }
1212
1213 }
1214 return (0);
1215 }
1216
1217 static int
dag_set_datalink(pcap_t * p,int dlt)1218 dag_set_datalink(pcap_t *p, int dlt)
1219 {
1220 p->linktype = dlt;
1221
1222 return (0);
1223 }
1224
1225 static int
dag_setnonblock(pcap_t * p,int nonblock)1226 dag_setnonblock(pcap_t *p, int nonblock)
1227 {
1228 struct pcap_dag *pd = p->priv;
1229 dag_size_t mindata;
1230 struct timeval maxwait;
1231 struct timeval poll;
1232
1233 /*
1234 * Set non-blocking mode on the FD.
1235 * XXX - is that necessary? If not, don't bother calling it,
1236 * and have a "dag_getnonblock()" function that looks at
1237 * "pd->dag_flags".
1238 */
1239 if (pcapint_setnonblock_fd(p, nonblock) < 0)
1240 return (-1);
1241
1242 if (dag_get_stream_poll64(p->fd, pd->dag_stream,
1243 &mindata, &maxwait, &poll) < 0) {
1244 pcapint_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
1245 errno, "dag_get_stream_poll");
1246 return -1;
1247 }
1248
1249 /* Amount of data to collect in Bytes before calling callbacks.
1250 * Important for efficiency, but can introduce latency
1251 * at low packet rates if to_ms not set!
1252 */
1253 if(nonblock)
1254 mindata = 0;
1255 else
1256 mindata = 65536;
1257
1258 if (dag_set_stream_poll64(p->fd, pd->dag_stream,
1259 mindata, &maxwait, &poll) < 0) {
1260 pcapint_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
1261 errno, "dag_set_stream_poll");
1262 return -1;
1263 }
1264
1265 if (nonblock) {
1266 pd->dag_flags |= DAGF_NONBLOCK;
1267 } else {
1268 pd->dag_flags &= ~DAGF_NONBLOCK;
1269 }
1270 return (0);
1271 }
1272
1273 static int
dag_get_datalink(pcap_t * p)1274 dag_get_datalink(pcap_t *p)
1275 {
1276 struct pcap_dag *pd = p->priv;
1277 int index=0, dlt_index=0;
1278 uint8_t types[255];
1279
1280 memset(types, 0, 255);
1281
1282 if (p->dlt_list == NULL && (p->dlt_list = malloc(255*sizeof(*(p->dlt_list)))) == NULL) {
1283 pcapint_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
1284 errno, "malloc");
1285 return (-1);
1286 }
1287
1288 p->linktype = 0;
1289
1290 #ifdef HAVE_DAG_GET_STREAM_ERF_TYPES
1291 /* Get list of possible ERF types for this card */
1292 if (dag_get_stream_erf_types(p->fd, pd->dag_stream, types, 255) < 0) {
1293 pcapint_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
1294 errno, "dag_get_stream_erf_types");
1295 return (-1);
1296 }
1297
1298 while (types[index]) {
1299
1300 #elif defined HAVE_DAG_GET_ERF_TYPES
1301 /* Get list of possible ERF types for this card */
1302 if (dag_get_erf_types(p->fd, types, 255) < 0) {
1303 pcapint_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
1304 errno, "dag_get_erf_types");
1305 return (-1);
1306 }
1307
1308 while (types[index]) {
1309 #else
1310 /* Check the type through a dagapi call. */
1311 types[index] = dag_linktype(p->fd);
1312
1313 {
1314 #endif
1315 switch((types[index] & 0x7f)) {
1316
1317 case ERF_TYPE_HDLC_POS:
1318 case ERF_TYPE_COLOR_HDLC_POS:
1319 case ERF_TYPE_DSM_COLOR_HDLC_POS:
1320 case ERF_TYPE_COLOR_HASH_POS:
1321 p->dlt_list[dlt_index++] = DLT_CHDLC;
1322 p->dlt_list[dlt_index++] = DLT_PPP_SERIAL;
1323 p->dlt_list[dlt_index++] = DLT_FRELAY;
1324 if(!p->linktype)
1325 p->linktype = DLT_CHDLC;
1326 break;
1327
1328 case ERF_TYPE_ETH:
1329 case ERF_TYPE_COLOR_ETH:
1330 case ERF_TYPE_DSM_COLOR_ETH:
1331 case ERF_TYPE_COLOR_HASH_ETH:
1332 /*
1333 * This is (presumably) a real Ethernet capture; give it a
1334 * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
1335 * that an application can let you choose it, in case you're
1336 * capturing DOCSIS traffic that a Cisco Cable Modem
1337 * Termination System is putting out onto an Ethernet (it
1338 * doesn't put an Ethernet header onto the wire, it puts raw
1339 * DOCSIS frames out on the wire inside the low-level
1340 * Ethernet framing).
1341 */
1342 p->dlt_list[dlt_index++] = DLT_EN10MB;
1343 p->dlt_list[dlt_index++] = DLT_DOCSIS;
1344 if(!p->linktype)
1345 p->linktype = DLT_EN10MB;
1346 break;
1347
1348 case ERF_TYPE_ATM:
1349 case ERF_TYPE_AAL5:
1350 case ERF_TYPE_MC_ATM:
1351 case ERF_TYPE_MC_AAL5:
1352 p->dlt_list[dlt_index++] = DLT_ATM_RFC1483;
1353 p->dlt_list[dlt_index++] = DLT_SUNATM;
1354 if(!p->linktype)
1355 p->linktype = DLT_ATM_RFC1483;
1356 break;
1357
1358 case ERF_TYPE_COLOR_MC_HDLC_POS:
1359 case ERF_TYPE_MC_HDLC:
1360 p->dlt_list[dlt_index++] = DLT_CHDLC;
1361 p->dlt_list[dlt_index++] = DLT_PPP_SERIAL;
1362 p->dlt_list[dlt_index++] = DLT_FRELAY;
1363 p->dlt_list[dlt_index++] = DLT_MTP2;
1364 p->dlt_list[dlt_index++] = DLT_MTP2_WITH_PHDR;
1365 p->dlt_list[dlt_index++] = DLT_LAPD;
1366 if(!p->linktype)
1367 p->linktype = DLT_CHDLC;
1368 break;
1369
1370 case ERF_TYPE_IPV4:
1371 p->dlt_list[dlt_index++] = DLT_RAW;
1372 p->dlt_list[dlt_index++] = DLT_IPV4;
1373 if(!p->linktype)
1374 p->linktype = DLT_RAW;
1375 break;
1376
1377 case ERF_TYPE_IPV6:
1378 p->dlt_list[dlt_index++] = DLT_RAW;
1379 p->dlt_list[dlt_index++] = DLT_IPV6;
1380 if(!p->linktype)
1381 p->linktype = DLT_RAW;
1382 break;
1383
1384 case ERF_TYPE_LEGACY:
1385 case ERF_TYPE_MC_RAW:
1386 case ERF_TYPE_MC_RAW_CHANNEL:
1387 case ERF_TYPE_IP_COUNTER:
1388 case ERF_TYPE_TCP_FLOW_COUNTER:
1389 case ERF_TYPE_INFINIBAND:
1390 case ERF_TYPE_RAW_LINK:
1391 case ERF_TYPE_INFINIBAND_LINK:
1392 case ERF_TYPE_META:
1393 default:
1394 /* Libpcap cannot deal with these types yet */
1395 /* Add no 'native' DLTs, but still covered by DLT_ERF */
1396 break;
1397
1398 } /* switch */
1399 index++;
1400 }
1401
1402 p->dlt_list[dlt_index++] = DLT_ERF;
1403
1404 p->dlt_count = dlt_index;
1405
1406 if(!p->linktype)
1407 p->linktype = DLT_ERF;
1408
1409 return p->linktype;
1410 }
1411
1412 #ifdef DAG_ONLY
1413 /*
1414 * This libpcap build supports only DAG cards, not regular network
1415 * interfaces.
1416 */
1417
1418 /*
1419 * There are no regular interfaces, just DAG interfaces.
1420 */
1421 int
1422 pcapint_platform_finddevs(pcap_if_list_t *devlistp _U_, char *errbuf)
1423 {
1424 return (0);
1425 }
1426
1427 /*
1428 * Attempts to open a regular interface fail.
1429 */
1430 pcap_t *
1431 pcapint_create_interface(const char *device, char *errbuf)
1432 {
1433 snprintf(errbuf, PCAP_ERRBUF_SIZE,
1434 "This version of libpcap only supports DAG cards");
1435 return NULL;
1436 }
1437
1438 /*
1439 * Libpcap version string.
1440 */
1441 const char *
1442 pcap_lib_version(void)
1443 {
1444 return (PCAP_VERSION_STRING " (DAG-only)");
1445 }
1446 #endif
1447