1 #ifdef HAVE_CONFIG_H
2 #include <config.h>
3 #endif
4
5 #ifndef _WIN32
6 #include <sys/param.h>
7 #endif /* !_WIN32 */
8
9 #include <stdlib.h>
10 #include <string.h>
11 #include <errno.h>
12
13 #include <ctype.h>
14 #ifndef _WIN32
15 #include <netinet/in.h>
16 #include <sys/mman.h>
17 #include <sys/socket.h>
18 #include <sys/types.h>
19 #include <unistd.h>
20 #endif /* !_WIN32 */
21
22 #include <snf.h>
23 #if SNF_VERSION_API >= 0x0003
24 #define SNF_HAVE_INJECT_API
25 #endif
26
27 #include "pcap-int.h"
28 #include "pcap-snf.h"
29
30 /*
31 * Private data for capturing on SNF devices.
32 */
33 struct pcap_snf {
34 snf_handle_t snf_handle; /* opaque device handle */
35 snf_ring_t snf_ring; /* opaque device ring handle */
36 #ifdef SNF_HAVE_INJECT_API
37 snf_inject_t snf_inj; /* inject handle, if inject is used */
38 #endif
39 int snf_timeout;
40 int snf_boardnum;
41 };
42
43 static int
snf_set_datalink(pcap_t * p,int dlt)44 snf_set_datalink(pcap_t *p, int dlt)
45 {
46 p->linktype = dlt;
47 return (0);
48 }
49
50 static int
snf_pcap_stats(pcap_t * p,struct pcap_stat * ps)51 snf_pcap_stats(pcap_t *p, struct pcap_stat *ps)
52 {
53 struct snf_ring_stats stats;
54 struct pcap_snf *snfps = p->priv;
55 int rc;
56
57 if ((rc = snf_ring_getstats(snfps->snf_ring, &stats))) {
58 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
59 rc, "snf_get_stats");
60 return -1;
61 }
62 ps->ps_recv = stats.ring_pkt_recv + stats.ring_pkt_overflow;
63 ps->ps_drop = stats.ring_pkt_overflow;
64 ps->ps_ifdrop = stats.nic_pkt_overflow + stats.nic_pkt_bad;
65 return 0;
66 }
67
68 static void
snf_platform_cleanup(pcap_t * p)69 snf_platform_cleanup(pcap_t *p)
70 {
71 struct pcap_snf *ps = p->priv;
72
73 #ifdef SNF_HAVE_INJECT_API
74 if (ps->snf_inj)
75 snf_inject_close(ps->snf_inj);
76 #endif
77 snf_ring_close(ps->snf_ring);
78 snf_close(ps->snf_handle);
79 pcap_cleanup_live_common(p);
80 }
81
82 static int
snf_getnonblock(pcap_t * p)83 snf_getnonblock(pcap_t *p)
84 {
85 struct pcap_snf *ps = p->priv;
86
87 return (ps->snf_timeout == 0);
88 }
89
90 static int
snf_setnonblock(pcap_t * p,int nonblock)91 snf_setnonblock(pcap_t *p, int nonblock)
92 {
93 struct pcap_snf *ps = p->priv;
94
95 if (nonblock)
96 ps->snf_timeout = 0;
97 else {
98 if (p->opt.timeout <= 0)
99 ps->snf_timeout = -1; /* forever */
100 else
101 ps->snf_timeout = p->opt.timeout;
102 }
103 return (0);
104 }
105
106 #define _NSEC_PER_SEC 1000000000
107
108 static inline
109 struct timeval
snf_timestamp_to_timeval(const int64_t ts_nanosec,const int tstamp_precision)110 snf_timestamp_to_timeval(const int64_t ts_nanosec, const int tstamp_precision)
111 {
112 struct timeval tv;
113 long tv_nsec;
114 const static struct timeval zero_timeval;
115
116 if (ts_nanosec == 0)
117 return zero_timeval;
118
119 tv.tv_sec = ts_nanosec / _NSEC_PER_SEC;
120 tv_nsec = (ts_nanosec % _NSEC_PER_SEC);
121
122 /* libpcap expects tv_usec to be nanos if using nanosecond precision. */
123 if (tstamp_precision == PCAP_TSTAMP_PRECISION_NANO)
124 tv.tv_usec = tv_nsec;
125 else
126 tv.tv_usec = tv_nsec / 1000;
127
128 return tv;
129 }
130
131 static int
snf_read(pcap_t * p,int cnt,pcap_handler callback,u_char * user)132 snf_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
133 {
134 struct pcap_snf *ps = p->priv;
135 struct pcap_pkthdr hdr;
136 int i, flags, err, caplen, n;
137 struct snf_recv_req req;
138 int nonblock, timeout;
139
140 if (!p)
141 return -1;
142
143 n = 0;
144 timeout = ps->snf_timeout;
145 while (n < cnt || PACKET_COUNT_IS_UNLIMITED(cnt)) {
146 /*
147 * Has "pcap_breakloop()" been called?
148 */
149 if (p->break_loop) {
150 if (n == 0) {
151 p->break_loop = 0;
152 return (-2);
153 } else {
154 return (n);
155 }
156 }
157
158 err = snf_ring_recv(ps->snf_ring, timeout, &req);
159
160 if (err) {
161 if (err == EBUSY || err == EAGAIN) {
162 return (n);
163 }
164 else if (err == EINTR) {
165 timeout = 0;
166 continue;
167 }
168 else {
169 pcap_fmt_errmsg_for_errno(p->errbuf,
170 PCAP_ERRBUF_SIZE, err, "snf_read");
171 return -1;
172 }
173 }
174
175 caplen = req.length;
176 if (caplen > p->snapshot)
177 caplen = p->snapshot;
178
179 if ((p->fcode.bf_insns == NULL) ||
180 bpf_filter(p->fcode.bf_insns, req.pkt_addr, req.length, caplen)) {
181 hdr.ts = snf_timestamp_to_timeval(req.timestamp, p->opt.tstamp_precision);
182 hdr.caplen = caplen;
183 hdr.len = req.length;
184 callback(user, &hdr, req.pkt_addr);
185 }
186 n++;
187
188 /* After one successful packet is received, we won't block
189 * again for that timeout. */
190 if (timeout != 0)
191 timeout = 0;
192 }
193 return (n);
194 }
195
196 static int
snf_setfilter(pcap_t * p,struct bpf_program * fp)197 snf_setfilter(pcap_t *p, struct bpf_program *fp)
198 {
199 if (!p)
200 return -1;
201 if (!fp) {
202 strncpy(p->errbuf, "setfilter: No filter specified",
203 sizeof(p->errbuf));
204 return -1;
205 }
206
207 /* Make our private copy of the filter */
208
209 if (install_bpf_program(p, fp) < 0)
210 return -1;
211
212 return (0);
213 }
214
215 static int
snf_inject(pcap_t * p,const void * buf _U_,size_t size _U_)216 snf_inject(pcap_t *p, const void *buf _U_, size_t size _U_)
217 {
218 #ifdef SNF_HAVE_INJECT_API
219 struct pcap_snf *ps = p->priv;
220 int rc;
221 if (ps->snf_inj == NULL) {
222 rc = snf_inject_open(ps->snf_boardnum, 0, &ps->snf_inj);
223 if (rc) {
224 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
225 rc, "snf_inject_open");
226 return (-1);
227 }
228 }
229
230 rc = snf_inject_send(ps->snf_inj, -1, 0, buf, size);
231 if (!rc) {
232 return (size);
233 }
234 else {
235 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
236 rc, "snf_inject_send");
237 return (-1);
238 }
239 #else
240 strlcpy(p->errbuf, "Sending packets isn't supported with this snf version",
241 PCAP_ERRBUF_SIZE);
242 return (-1);
243 #endif
244 }
245
246 static int
snf_activate(pcap_t * p)247 snf_activate(pcap_t* p)
248 {
249 struct pcap_snf *ps = p->priv;
250 char *device = p->opt.device;
251 const char *nr = NULL;
252 int err;
253 int flags = -1, ring_id = -1;
254
255 if (device == NULL) {
256 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "device is NULL");
257 return -1;
258 }
259
260 /* In Libpcap, we set pshared by default if NUM_RINGS is set to > 1.
261 * Since libpcap isn't thread-safe */
262 if ((nr = getenv("SNF_FLAGS")) && *nr)
263 flags = strtol(nr, NULL, 0);
264 else if ((nr = getenv("SNF_NUM_RINGS")) && *nr && atoi(nr) > 1)
265 flags = SNF_F_PSHARED;
266 else
267 nr = NULL;
268
269
270 /* Allow pcap_set_buffer_size() to set dataring_size.
271 * Default is zero which allows setting from env SNF_DATARING_SIZE.
272 * pcap_set_buffer_size() is in bytes while snf_open() accepts values
273 * between 0 and 1048576 in Megabytes. Values in this range are
274 * mapped to 1MB.
275 */
276 err = snf_open(ps->snf_boardnum,
277 0, /* let SNF API parse SNF_NUM_RINGS, if set */
278 NULL, /* default RSS, or use SNF_RSS_FLAGS env */
279 (p->opt.buffer_size > 0 && p->opt.buffer_size < 1048576) ? 1048576 : p->opt.buffer_size, /* default to SNF_DATARING_SIZE from env */
280 flags, /* may want pshared */
281 &ps->snf_handle);
282 if (err != 0) {
283 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
284 err, "snf_open failed");
285 return -1;
286 }
287
288 if ((nr = getenv("SNF_PCAP_RING_ID")) && *nr) {
289 ring_id = (int) strtol(nr, NULL, 0);
290 }
291 err = snf_ring_open_id(ps->snf_handle, ring_id, &ps->snf_ring);
292 if (err != 0) {
293 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
294 err, "snf_ring_open_id(ring=%d) failed", ring_id);
295 return -1;
296 }
297
298 /*
299 * Turn a negative snapshot value (invalid), a snapshot value of
300 * 0 (unspecified), or a value bigger than the normal maximum
301 * value, into the maximum allowed value.
302 *
303 * If some application really *needs* a bigger snapshot
304 * length, we should just increase MAXIMUM_SNAPLEN.
305 */
306 if (p->snapshot <= 0 || p->snapshot > MAXIMUM_SNAPLEN)
307 p->snapshot = MAXIMUM_SNAPLEN;
308
309 if (p->opt.timeout <= 0)
310 ps->snf_timeout = -1;
311 else
312 ps->snf_timeout = p->opt.timeout;
313
314 err = snf_start(ps->snf_handle);
315 if (err != 0) {
316 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
317 err, "snf_start failed");
318 return -1;
319 }
320
321 /*
322 * "select()" and "poll()" don't work on snf descriptors.
323 */
324 #ifndef _WIN32
325 p->selectable_fd = -1;
326 #endif /* !_WIN32 */
327 p->linktype = DLT_EN10MB;
328 p->read_op = snf_read;
329 p->inject_op = snf_inject;
330 p->setfilter_op = snf_setfilter;
331 p->setdirection_op = NULL; /* Not implemented.*/
332 p->set_datalink_op = snf_set_datalink;
333 p->getnonblock_op = snf_getnonblock;
334 p->setnonblock_op = snf_setnonblock;
335 p->stats_op = snf_pcap_stats;
336 p->cleanup_op = snf_platform_cleanup;
337 #ifdef SNF_HAVE_INJECT_API
338 ps->snf_inj = NULL;
339 #endif
340 return 0;
341 }
342
343 #define MAX_DESC_LENGTH 128
344 int
snf_findalldevs(pcap_if_list_t * devlistp,char * errbuf)345 snf_findalldevs(pcap_if_list_t *devlistp, char *errbuf)
346 {
347 pcap_if_t *dev;
348 #ifdef _WIN32
349 struct sockaddr_in addr;
350 #endif
351 struct snf_ifaddrs *ifaddrs, *ifa;
352 char name[MAX_DESC_LENGTH];
353 char desc[MAX_DESC_LENGTH];
354 int ret, allports = 0, merge = 0;
355 const char *nr = NULL;
356
357 if (snf_init(SNF_VERSION_API)) {
358 (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
359 "snf_getifaddrs: snf_init failed");
360 return (-1);
361 }
362
363 if (snf_getifaddrs(&ifaddrs) || ifaddrs == NULL)
364 {
365 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
366 errno, "snf_getifaddrs");
367 return (-1);
368 }
369 if ((nr = getenv("SNF_FLAGS")) && *nr) {
370 errno = 0;
371 merge = strtol(nr, NULL, 0);
372 if (errno) {
373 (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
374 "snf_getifaddrs: SNF_FLAGS is not a valid number");
375 return (-1);
376 }
377 merge = merge & SNF_F_AGGREGATE_PORTMASK;
378 }
379
380 for (ifa = ifaddrs; ifa != NULL; ifa = ifa->snf_ifa_next) {
381 /*
382 * Myricom SNF adapter ports may appear as regular
383 * network interfaces, which would already have been
384 * added to the list of adapters by pcap_platform_finddevs()
385 * if this isn't an SNF-only version of libpcap.
386 *
387 * Our create routine intercepts pcap_create() calls for
388 * those interfaces and arranges that they will be
389 * opened using the SNF API instead.
390 *
391 * So if we already have an entry for the device, we
392 * don't add an additional entry for it, we just
393 * update the description for it, if any, to indicate
394 * which snfN device it is. Otherwise, we add an entry
395 * for it.
396 *
397 * In either case, if SNF_F_AGGREGATE_PORTMASK is set
398 * in SNF_FLAGS, we add this port to the bitmask
399 * of ports, which we use to generate a device
400 * we can use to capture on all ports.
401 *
402 * Generate the description string. If port aggregation
403 * is set, use 2^{port number} as the unit number,
404 * rather than {port number}.
405 *
406 * XXX - do entries in this list have IP addresses for
407 * the port? If so, should we add them to the
408 * entry for the device, if they're not already in the
409 * list of IP addresses for the device?
410 */
411 (void)pcap_snprintf(desc,MAX_DESC_LENGTH,"Myricom %ssnf%d",
412 merge ? "Merge Bitmask Port " : "",
413 merge ? 1 << ifa->snf_ifa_portnum : ifa->snf_ifa_portnum);
414 /*
415 * Add the port to the bitmask.
416 */
417 if (merge)
418 allports |= 1 << ifa->snf_ifa_portnum;
419 /*
420 * See if there's already an entry for the device
421 * with the name ifa->snf_ifa_name.
422 */
423 dev = find_dev(devlistp, ifa->snf_ifa_name);
424 if (dev != NULL) {
425 /*
426 * Yes. Update its description.
427 */
428 char *desc_str;
429
430 desc_str = strdup(desc);
431 if (desc_str == NULL) {
432 pcap_fmt_errmsg_for_errno(errbuf,
433 PCAP_ERRBUF_SIZE, errno,
434 "snf_findalldevs strdup");
435 return -1;
436 }
437 free(dev->description);
438 dev->description = desc_str;
439 } else {
440 /*
441 * No. Add an entry for it.
442 *
443 * XXX - is there a notion of "up" or "running",
444 * and can we determine whether something's
445 * plugged into the adapter and set
446 * PCAP_IF_CONNECTION_STATUS_CONNECTED or
447 * PCAP_IF_CONNECTION_STATUS_DISCONNECTED?
448 */
449 dev = add_dev(devlistp, ifa->snf_ifa_name, 0, desc,
450 errbuf);
451 if (dev == NULL)
452 return -1;
453 #ifdef _WIN32
454 /*
455 * On Windows, fill in IP# from device name
456 */
457 ret = inet_pton(AF_INET, dev->name, &addr.sin_addr);
458 if (ret == 1) {
459 /*
460 * Successful conversion of device name
461 * to IPv4 address.
462 */
463 addr.sin_family = AF_INET;
464 if (add_addr_to_dev(dev, &addr, sizeof(addr),
465 NULL, 0, NULL, 0, NULL, 0, errbuf) == -1)
466 return -1;
467 } else if (ret == -1) {
468 /*
469 * Error.
470 */
471 pcap_fmt_errmsg_for_errno(errbuf,
472 PCAP_ERRBUF_SIZE, errno,
473 "sinf_findalldevs inet_pton");
474 return -1;
475 }
476 #endif _WIN32
477 }
478 }
479 snf_freeifaddrs(ifaddrs);
480 /*
481 * Create a snfX entry if port aggregation is enabled
482 */
483 if (merge) {
484 /*
485 * Add a new entry with all ports bitmask
486 */
487 (void)pcap_snprintf(name,MAX_DESC_LENGTH,"snf%d",allports);
488 (void)pcap_snprintf(desc,MAX_DESC_LENGTH,"Myricom Merge Bitmask All Ports snf%d",
489 allports);
490 /*
491 * XXX - is there any notion of "up" and "running" that
492 * would apply to this device, given that it handles
493 * multiple ports?
494 *
495 * Presumably, there's no notion of "connected" vs.
496 * "disconnected", as "is this plugged into a network?"
497 * would be a per-port property.
498 */
499 if (add_dev(devlistp, name,
500 PCAP_IF_CONNECTION_STATUS_NOT_APPLICABLE, desc,
501 errbuf) == NULL)
502 return (-1);
503 /*
504 * XXX - should we give it a list of addresses with all
505 * the addresses for all the ports?
506 */
507 }
508
509 return 0;
510 }
511
512 pcap_t *
snf_create(const char * device,char * ebuf,int * is_ours)513 snf_create(const char *device, char *ebuf, int *is_ours)
514 {
515 pcap_t *p;
516 int boardnum = -1;
517 struct snf_ifaddrs *ifaddrs, *ifa;
518 size_t devlen;
519 struct pcap_snf *ps;
520
521 if (snf_init(SNF_VERSION_API)) {
522 /* Can't initialize the API, so no SNF devices */
523 *is_ours = 0;
524 return NULL;
525 }
526
527 /*
528 * Match a given interface name to our list of interface names, from
529 * which we can obtain the intended board number
530 */
531 if (snf_getifaddrs(&ifaddrs) || ifaddrs == NULL) {
532 /* Can't get SNF addresses */
533 *is_ours = 0;
534 return NULL;
535 }
536 devlen = strlen(device) + 1;
537 ifa = ifaddrs;
538 while (ifa) {
539 if (strncmp(device, ifa->snf_ifa_name, devlen) == 0) {
540 boardnum = ifa->snf_ifa_boardnum;
541 break;
542 }
543 ifa = ifa->snf_ifa_next;
544 }
545 snf_freeifaddrs(ifaddrs);
546
547 if (ifa == NULL) {
548 /*
549 * If we can't find the device by name, support the name "snfX"
550 * and "snf10gX" where X is the board number.
551 */
552 if (sscanf(device, "snf10g%d", &boardnum) != 1 &&
553 sscanf(device, "snf%d", &boardnum) != 1) {
554 /* Nope, not a supported name */
555 *is_ours = 0;
556 return NULL;
557 }
558 }
559
560 /* OK, it's probably ours. */
561 *is_ours = 1;
562
563 p = pcap_create_common(ebuf, sizeof (struct pcap_snf));
564 if (p == NULL)
565 return NULL;
566 ps = p->priv;
567
568 /*
569 * We support microsecond and nanosecond time stamps.
570 */
571 p->tstamp_precision_count = 2;
572 p->tstamp_precision_list = malloc(2 * sizeof(u_int));
573 if (p->tstamp_precision_list == NULL) {
574 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE, errno,
575 "malloc");
576 pcap_close(p);
577 return NULL;
578 }
579 p->tstamp_precision_list[0] = PCAP_TSTAMP_PRECISION_MICRO;
580 p->tstamp_precision_list[1] = PCAP_TSTAMP_PRECISION_NANO;
581
582 p->activate_op = snf_activate;
583 ps->snf_boardnum = boardnum;
584 return p;
585 }
586
587 #ifdef SNF_ONLY
588 /*
589 * This libpcap build supports only SNF cards, not regular network
590 * interfaces..
591 */
592
593 /*
594 * There are no regular interfaces, just SNF interfaces.
595 */
596 int
pcap_platform_finddevs(pcap_if_list_t * devlistp,char * errbuf)597 pcap_platform_finddevs(pcap_if_list_t *devlistp, char *errbuf)
598 {
599 return (0);
600 }
601
602 /*
603 * Attempts to open a regular interface fail.
604 */
605 pcap_t *
pcap_create_interface(const char * device,char * errbuf)606 pcap_create_interface(const char *device, char *errbuf)
607 {
608 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
609 "This version of libpcap only supports SNF cards");
610 return NULL;
611 }
612
613 /*
614 * Libpcap version string.
615 */
616 const char *
pcap_lib_version(void)617 pcap_lib_version(void)
618 {
619 return (PCAP_VERSION_STRING " (SNF-only)");
620 }
621 #endif
622