nexmon – Blame information for rev 1

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1 office 1 #ifdef HAVE_CONFIG_H
2 #include "config.h"
3 #endif
4  
5 #include <sys/param.h>
6  
7 #include <stdlib.h>
8 #include <string.h>
9 #include <errno.h>
10  
11 #include <ctype.h>
12 #include <netinet/in.h>
13 #include <sys/mman.h>
14 #include <sys/socket.h>
15 #include <sys/types.h>
16 #include <unistd.h>
17  
18 #include <snf.h>
19 #if SNF_VERSION_API >= 0x0003
20 #define SNF_HAVE_INJECT_API
21 #endif
22  
23 #include "pcap-int.h"
24 #include "pcap-snf.h"
25  
26 /*
27 * Private data for capturing on SNF devices.
28 */
29 struct pcap_snf {
30 snf_handle_t snf_handle; /* opaque device handle */
31 snf_ring_t snf_ring; /* opaque device ring handle */
32 #ifdef SNF_HAVE_INJECT_API
33 snf_inject_t snf_inj; /* inject handle, if inject is used */
34 #endif
35 int snf_timeout;
36 int snf_boardnum;
37 };
38  
39 static int
40 snf_set_datalink(pcap_t *p, int dlt)
41 {
42 p->linktype = dlt;
43 return (0);
44 }
45  
46 static int
47 snf_pcap_stats(pcap_t *p, struct pcap_stat *ps)
48 {
49 struct snf_ring_stats stats;
50 struct pcap_snf *snfps = p->priv;
51 int rc;
52  
53 if ((rc = snf_ring_getstats(snfps->snf_ring, &stats))) {
54 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "snf_get_stats: %s",
55 pcap_strerror(rc));
56 return -1;
57 }
58 ps->ps_recv = stats.ring_pkt_recv + stats.ring_pkt_overflow;
59 ps->ps_drop = stats.ring_pkt_overflow;
60 ps->ps_ifdrop = stats.nic_pkt_overflow + stats.nic_pkt_bad;
61 return 0;
62 }
63  
64 static void
65 snf_platform_cleanup(pcap_t *p)
66 {
67 struct pcap_snf *ps = p->priv;
68  
69 if (p == NULL)
70 return;
71  
72 #ifdef SNF_HAVE_INJECT_API
73 if (ps->snf_inj)
74 snf_inject_close(ps->snf_inj);
75 #endif
76 snf_ring_close(ps->snf_ring);
77 snf_close(ps->snf_handle);
78 pcap_cleanup_live_common(p);
79 }
80  
81 static int
82 snf_getnonblock(pcap_t *p, char *errbuf)
83 {
84 struct pcap_snf *ps = p->priv;
85  
86 return (ps->snf_timeout == 0);
87 }
88  
89 static int
90 snf_setnonblock(pcap_t *p, int nonblock, char *errbuf)
91 {
92 struct pcap_snf *ps = p->priv;
93  
94 if (nonblock)
95 ps->snf_timeout = 0;
96 else {
97 if (p->opt.timeout <= 0)
98 ps->snf_timeout = -1; /* forever */
99 else
100 ps->snf_timeout = p->opt.timeout;
101 }
102 return (0);
103 }
104  
105 #define _NSEC_PER_SEC 1000000000
106  
107 static inline
108 struct timeval
109 snf_timestamp_to_timeval(const int64_t ts_nanosec, const int tstamp_precision)
110 {
111 struct timeval tv;
112 long tv_nsec;
113  
114 if (ts_nanosec == 0)
115 return (struct timeval) { 0, 0 };
116  
117 tv.tv_sec = ts_nanosec / _NSEC_PER_SEC;
118 tv_nsec = (ts_nanosec % _NSEC_PER_SEC);
119  
120 /* libpcap expects tv_usec to be nanos if using nanosecond precision. */
121 if (tstamp_precision == PCAP_TSTAMP_PRECISION_NANO)
122 tv.tv_usec = tv_nsec;
123 else
124 tv.tv_usec = tv_nsec / 1000;
125  
126 return tv;
127 }
128  
129 static int
130 snf_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
131 {
132 struct pcap_snf *ps = p->priv;
133 struct pcap_pkthdr hdr;
134 int i, flags, err, caplen, n;
135 struct snf_recv_req req;
136 int nonblock, timeout;
137  
138 if (!p)
139 return -1;
140  
141 n = 0;
142 timeout = ps->snf_timeout;
143 while (n < cnt || PACKET_COUNT_IS_UNLIMITED(cnt)) {
144 /*
145 * Has "pcap_breakloop()" been called?
146 */
147 if (p->break_loop) {
148 if (n == 0) {
149 p->break_loop = 0;
150 return (-2);
151 } else {
152 return (n);
153 }
154 }
155  
156 err = snf_ring_recv(ps->snf_ring, timeout, &req);
157  
158 if (err) {
159 if (err == EBUSY || err == EAGAIN) {
160 return (n);
161 }
162 else if (err == EINTR) {
163 timeout = 0;
164 continue;
165 }
166 else {
167 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "snf_read: %s",
168 pcap_strerror(err));
169 return -1;
170 }
171 }
172  
173 caplen = req.length;
174 if (caplen > p->snapshot)
175 caplen = p->snapshot;
176  
177 if ((p->fcode.bf_insns == NULL) ||
178 bpf_filter(p->fcode.bf_insns, req.pkt_addr, req.length, caplen)) {
179 hdr.ts = snf_timestamp_to_timeval(req.timestamp, p->opt.tstamp_precision);
180 hdr.caplen = caplen;
181 hdr.len = req.length;
182 callback(user, &hdr, req.pkt_addr);
183 }
184 n++;
185  
186 /* After one successful packet is received, we won't block
187 * again for that timeout. */
188 if (timeout != 0)
189 timeout = 0;
190 }
191 return (n);
192 }
193  
194 static int
195 snf_setfilter(pcap_t *p, struct bpf_program *fp)
196 {
197 if (!p)
198 return -1;
199 if (!fp) {
200 strncpy(p->errbuf, "setfilter: No filter specified",
201 sizeof(p->errbuf));
202 return -1;
203 }
204  
205 /* Make our private copy of the filter */
206  
207 if (install_bpf_program(p, fp) < 0)
208 return -1;
209  
210 return (0);
211 }
212  
213 static int
214 snf_inject(pcap_t *p, const void *buf _U_, size_t size _U_)
215 {
216 #ifdef SNF_HAVE_INJECT_API
217 struct pcap_snf *ps = p->priv;
218 int rc;
219 if (ps->snf_inj == NULL) {
220 rc = snf_inject_open(ps->snf_boardnum, 0, &ps->snf_inj);
221 if (rc) {
222 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
223 "snf_inject_open: %s", pcap_strerror(rc));
224 return (-1);
225 }
226 }
227  
228 rc = snf_inject_send(ps->snf_inj, -1, 0, buf, size);
229 if (!rc) {
230 return (size);
231 }
232 else {
233 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "snf_inject_send: %s",
234 pcap_strerror(rc));
235 return (-1);
236 }
237 #else
238 strlcpy(p->errbuf, "Sending packets isn't supported with this snf version",
239 PCAP_ERRBUF_SIZE);
240 return (-1);
241 #endif
242 }
243  
244 static int
245 snf_activate(pcap_t* p)
246 {
247 struct pcap_snf *ps = p->priv;
248 char *device = p->opt.source;
249 const char *nr = NULL;
250 int err;
251 int flags = -1, ring_id = -1;
252  
253 if (device == NULL) {
254 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
255 "device is NULL: %s", pcap_strerror(errno));
256 return -1;
257 }
258  
259 /* In Libpcap, we set pshared by default if NUM_RINGS is set to > 1.
260 * Since libpcap isn't thread-safe */
261 if ((nr = getenv("SNF_FLAGS")) && *nr)
262 flags = strtol(nr, NULL, 0);
263 else if ((nr = getenv("SNF_NUM_RINGS")) && *nr && atoi(nr) > 1)
264 flags = SNF_F_PSHARED;
265 else
266 nr = NULL;
267  
268 err = snf_open(ps->snf_boardnum,
269 0, /* let SNF API parse SNF_NUM_RINGS, if set */
270 NULL, /* default RSS, or use SNF_RSS_FLAGS env */
271 0, /* default to SNF_DATARING_SIZE from env */
272 flags, /* may want pshared */
273 &ps->snf_handle);
274 if (err != 0) {
275 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
276 "snf_open failed: %s", pcap_strerror(err));
277 return -1;
278 }
279  
280 if ((nr = getenv("SNF_PCAP_RING_ID")) && *nr) {
281 ring_id = (int) strtol(nr, NULL, 0);
282 }
283 err = snf_ring_open_id(ps->snf_handle, ring_id, &ps->snf_ring);
284 if (err != 0) {
285 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
286 "snf_ring_open_id(ring=%d) failed: %s",
287 ring_id, pcap_strerror(err));
288 return -1;
289 }
290  
291 if (p->opt.timeout <= 0)
292 ps->snf_timeout = -1;
293 else
294 ps->snf_timeout = p->opt.timeout;
295  
296 err = snf_start(ps->snf_handle);
297 if (err != 0) {
298 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
299 "snf_start failed: %s", pcap_strerror(err));
300 return -1;
301 }
302  
303 /*
304 * "select()" and "poll()" don't work on snf descriptors.
305 */
306 p->selectable_fd = -1;
307 p->linktype = DLT_EN10MB;
308 p->read_op = snf_read;
309 p->inject_op = snf_inject;
310 p->setfilter_op = snf_setfilter;
311 p->setdirection_op = NULL; /* Not implemented.*/
312 p->set_datalink_op = snf_set_datalink;
313 p->getnonblock_op = snf_getnonblock;
314 p->setnonblock_op = snf_setnonblock;
315 p->stats_op = snf_pcap_stats;
316 p->cleanup_op = snf_platform_cleanup;
317 #ifdef SNF_HAVE_INJECT_API
318 ps->snf_inj = NULL;
319 #endif
320 return 0;
321 }
322  
323 #define MAX_DESC_LENGTH 128
324 int
325 snf_findalldevs(pcap_if_t **devlistp, char *errbuf)
326 {
327 pcap_if_t *devlist = NULL,*curdev,*prevdev;
328 pcap_addr_t *curaddr;
329 struct snf_ifaddrs *ifaddrs, *ifa;
330 char desc[MAX_DESC_LENGTH];
331 int ret;
332  
333 if (snf_init(SNF_VERSION_API))
334 return (-1);
335  
336 if (snf_getifaddrs(&ifaddrs) || ifaddrs == NULL)
337 {
338 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
339 "snf_getifaddrs: %s", pcap_strerror(errno));
340 return (-1);
341 }
342 ifa = ifaddrs;
343 while (ifa)
344 {
345 /*
346 * Allocate a new entry
347 */
348 curdev = (pcap_if_t *)malloc(sizeof(pcap_if_t));
349 if (curdev == NULL) {
350 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
351 "snf_findalldevs malloc: %s", pcap_strerror(errno));
352 return (-1);
353 }
354 if (devlist == NULL) /* save first entry */
355 devlist = curdev;
356 else
357 prevdev->next = curdev;
358 /*
359 * Fill in the entry.
360 */
361 curdev->next = NULL;
362 curdev->name = strdup(ifa->snf_ifa_name);
363 if (curdev->name == NULL) {
364 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
365 "snf_findalldevs strdup: %s", pcap_strerror(errno));
366 free(curdev);
367 return (-1);
368 }
369 (void)snprintf(desc,MAX_DESC_LENGTH,"Myricom snf%d",
370 ifa->snf_ifa_portnum);
371 curdev->description = strdup(desc);
372 if (curdev->description == NULL) {
373 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
374 "snf_findalldevs strdup1: %s", pcap_strerror(errno));
375 free(curdev->name);
376 free(curdev);
377 return (-1);
378 }
379 curdev->addresses = NULL;
380 curdev->flags = 0;
381  
382 curaddr = (pcap_addr_t *)malloc(sizeof(pcap_addr_t));
383 if (curaddr == NULL) {
384 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
385 "snf_findalldevs malloc1: %s", pcap_strerror(errno));
386 free(curdev->description);
387 free(curdev->name);
388 free(curdev);
389 return (-1);
390 }
391 curdev->addresses = curaddr;
392 curaddr->next = NULL;
393 curaddr->addr = (struct sockaddr*)malloc(sizeof(struct sockaddr_storage));
394 if (curaddr->addr == NULL) {
395 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
396 "malloc2: %s", pcap_strerror(errno));
397 free(curdev->description);
398 free(curdev->name);
399 free(curaddr);
400 free(curdev);
401 return (-1);
402 }
403 curaddr->addr->sa_family = AF_INET;
404 curaddr->netmask = NULL;
405 curaddr->broadaddr = NULL;
406 curaddr->dstaddr = NULL;
407 curaddr->next = NULL;
408  
409 prevdev = curdev;
410 ifa = ifa->snf_ifa_next;
411 }
412 snf_freeifaddrs(ifaddrs);
413 *devlistp = devlist;
414  
415 /*
416 * There are no platform-specific devices since each device
417 * exists as a regular Ethernet device.
418 */
419 return 0;
420 }
421  
422 pcap_t *
423 snf_create(const char *device, char *ebuf, int *is_ours)
424 {
425 pcap_t *p;
426 int boardnum = -1;
427 struct snf_ifaddrs *ifaddrs, *ifa;
428 size_t devlen;
429 struct pcap_snf *ps;
430  
431 if (snf_init(SNF_VERSION_API)) {
432 /* Can't initialize the API, so no SNF devices */
433 *is_ours = 0;
434 return NULL;
435 }
436  
437 /*
438 * Match a given interface name to our list of interface names, from
439 * which we can obtain the intended board number
440 */
441 if (snf_getifaddrs(&ifaddrs) || ifaddrs == NULL) {
442 /* Can't get SNF addresses */
443 *is_ours = 0;
444 return NULL;
445 }
446 devlen = strlen(device) + 1;
447 ifa = ifaddrs;
448 while (ifa) {
449 if (!strncmp(device, ifa->snf_ifa_name, devlen)) {
450 boardnum = ifa->snf_ifa_boardnum;
451 break;
452 }
453 ifa = ifa->snf_ifa_next;
454 }
455 snf_freeifaddrs(ifaddrs);
456  
457 if (ifa == NULL) {
458 /*
459 * If we can't find the device by name, support the name "snfX"
460 * and "snf10gX" where X is the board number.
461 */
462 if (sscanf(device, "snf10g%d", &boardnum) != 1 &&
463 sscanf(device, "snf%d", &boardnum) != 1) {
464 /* Nope, not a supported name */
465 *is_ours = 0;
466 return NULL;
467 }
468 }
469  
470 /* OK, it's probably ours. */
471 *is_ours = 1;
472  
473 p = pcap_create_common(device, ebuf, sizeof (struct pcap_snf));
474 if (p == NULL)
475 return NULL;
476 ps = p->priv;
477  
478 /*
479 * We support microsecond and nanosecond time stamps.
480 */
481 p->tstamp_precision_count = 2;
482 p->tstamp_precision_list = malloc(2 * sizeof(u_int));
483 if (p->tstamp_precision_list == NULL) {
484 snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s",
485 pcap_strerror(errno));
486 if (p->tstamp_type_list != NULL)
487 free(p->tstamp_type_list);
488 free(p);
489 return NULL;
490 }
491 p->tstamp_precision_list[0] = PCAP_TSTAMP_PRECISION_MICRO;
492 p->tstamp_precision_list[1] = PCAP_TSTAMP_PRECISION_NANO;
493  
494 p->activate_op = snf_activate;
495 ps->snf_boardnum = boardnum;
496 return p;
497 }