2 * netsniff-ng - the packet sniffing beast
3 * Copyright 2009-2013 Daniel Borkmann.
4 * Copyright 2010 Emmanuel Roullit.
5 * Subject to the GPL, version 2.
16 #include <sys/socket.h>
17 #include <sys/types.h>
20 #include <sys/fsuid.h>
46 #include "tstamping.h"
47 #include "dissector.h"
56 char *device_in
, *device_out
, *device_trans
, *filter
, *prefix
;
57 int cpu
, rfraw
, dump
, print_mode
, dump_dir
, packet_type
;
58 unsigned long kpull
, dump_interval
, tx_bytes
, tx_packets
;
60 bool randomize
, promiscuous
, enforce
, jumbo
, dump_bpf
, hwtimestamp
, verbose
;
61 enum pcap_ops_groups pcap
;
62 enum dump_mode dump_mode
;
65 uint32_t link_type
, magic
;
66 uint32_t fanout_group
, fanout_type
;
69 static volatile sig_atomic_t sigint
= 0;
70 static volatile bool next_dump
= false;
72 static const char *short_options
= "d:i:o:rf:MNJt:S:k:n:b:HQmcsqXlvhF:RGAP:Vu:g:T:DBUC:K:L:";
73 static const struct option long_options
[] = {
74 {"dev", required_argument
, NULL
, 'd'},
75 {"in", required_argument
, NULL
, 'i'},
76 {"out", required_argument
, NULL
, 'o'},
77 {"filter", required_argument
, NULL
, 'f'},
78 {"num", required_argument
, NULL
, 'n'},
79 {"type", required_argument
, NULL
, 't'},
80 {"interval", required_argument
, NULL
, 'F'},
81 {"ring-size", required_argument
, NULL
, 'S'},
82 {"kernel-pull", required_argument
, NULL
, 'k'},
83 {"bind-cpu", required_argument
, NULL
, 'b'},
84 {"prefix", required_argument
, NULL
, 'P'},
85 {"user", required_argument
, NULL
, 'u'},
86 {"group", required_argument
, NULL
, 'g'},
87 {"magic", required_argument
, NULL
, 'T'},
88 {"fanout-group", required_argument
, NULL
, 'C'},
89 {"fanout-type", required_argument
, NULL
, 'K'},
90 {"fanout-opts", required_argument
, NULL
, 'L'},
91 {"rand", no_argument
, NULL
, 'r'},
92 {"rfraw", no_argument
, NULL
, 'R'},
93 {"mmap", no_argument
, NULL
, 'm'},
94 {"sg", no_argument
, NULL
, 'G'},
95 {"clrw", no_argument
, NULL
, 'c'},
96 {"jumbo-support", no_argument
, NULL
, 'J'},
97 {"no-promisc", no_argument
, NULL
, 'M'},
98 {"no-hwtimestamp", no_argument
, NULL
, 'N'},
99 {"prio-high", no_argument
, NULL
, 'H'},
100 {"notouch-irq", no_argument
, NULL
, 'Q'},
101 {"dump-pcap-types", no_argument
, NULL
, 'D'},
102 {"dump-bpf", no_argument
, NULL
, 'B'},
103 {"silent", no_argument
, NULL
, 's'},
104 {"less", no_argument
, NULL
, 'q'},
105 {"hex", no_argument
, NULL
, 'X'},
106 {"ascii", no_argument
, NULL
, 'l'},
107 {"no-sock-mem", no_argument
, NULL
, 'A'},
108 {"update", no_argument
, NULL
, 'U'},
109 {"verbose", no_argument
, NULL
, 'V'},
110 {"version", no_argument
, NULL
, 'v'},
111 {"help", no_argument
, NULL
, 'h'},
115 static const char *copyright
= "Please report bugs to <bugs@netsniff-ng.org>\n"
116 "Copyright (C) 2009-2013 Daniel Borkmann <dborkma@tik.ee.ethz.ch>\n"
117 "Copyright (C) 2009-2012 Emmanuel Roullit <emmanuel.roullit@gmail.com>\n"
118 "Copyright (C) 2012 Markus Amend <markus@netsniff-ng.org>\n"
119 "Swiss federal institute of technology (ETH Zurich)\n"
120 "License: GNU GPL version 2.0\n"
121 "This is free software: you are free to change and redistribute it.\n"
122 "There is NO WARRANTY, to the extent permitted by law.";
125 static struct itimerval itimer
;
126 static unsigned long frame_count_max
= 0, interval
= TX_KERNEL_PULL_INT
;
128 #define __pcap_io pcap_ops[ctx->pcap]
130 static void signal_handler(int number
)
143 static void timer_elapsed(int unused __maybe_unused
)
147 set_itimer_interval_value(&itimer
, 0, interval
);
149 ret
= pull_and_flush_tx_ring(tx_sock
);
150 if (unlikely(ret
< 0)) {
151 /* We could hit EBADF if the socket has been closed before
152 * the timer was triggered.
154 if (errno
!= EBADF
&& errno
!= ENOBUFS
)
155 panic("Flushing TX_RING failed: %s!\n", strerror(errno
));
158 setitimer(ITIMER_REAL
, &itimer
, NULL
);
161 static void timer_purge(void)
165 ret
= pull_and_flush_tx_ring_wait(tx_sock
);
166 if (unlikely(ret
< 0)) {
167 if (errno
!= EBADF
&& errno
!= ENOBUFS
)
168 panic("Flushing TX_RING failed: %s!\n", strerror(errno
));
171 set_itimer_interval_value(&itimer
, 0, 0);
172 setitimer(ITIMER_REAL
, &itimer
, NULL
);
175 static void timer_next_dump(int unused __maybe_unused
)
177 set_itimer_interval_value(&itimer
, interval
, 0);
179 setitimer(ITIMER_REAL
, &itimer
, NULL
);
182 static inline bool dump_to_pcap(struct ctx
*ctx
)
187 static void pcap_to_xmit(struct ctx
*ctx
)
190 int ifindex
, fd
= 0, ret
;
193 unsigned long trunced
= 0;
195 struct frame_map
*hdr
;
196 struct sock_fprog bpf_ops
;
197 struct timeval start
, end
, diff
;
200 if (!device_up_and_running(ctx
->device_out
) && !ctx
->rfraw
)
201 panic("Device not up and running!\n");
205 tx_sock
= pf_socket();
207 if (!strncmp("-", ctx
->device_in
, strlen("-"))) {
208 fd
= dup_or_die(fileno(stdin
));
209 close(fileno(stdin
));
210 if (ctx
->pcap
== PCAP_OPS_MM
)
211 ctx
->pcap
= PCAP_OPS_SG
;
213 fd
= open_or_die(ctx
->device_in
, O_RDONLY
| O_LARGEFILE
| O_NOATIME
);
216 if (__pcap_io
->init_once_pcap
)
217 __pcap_io
->init_once_pcap();
219 ret
= __pcap_io
->pull_fhdr_pcap(fd
, &ctx
->magic
, &ctx
->link_type
);
221 panic("Error reading pcap header!\n");
223 if (__pcap_io
->prepare_access_pcap
) {
224 ret
= __pcap_io
->prepare_access_pcap(fd
, PCAP_MODE_RD
, ctx
->jumbo
);
226 panic("Error prepare reading pcap!\n");
230 ctx
->device_trans
= xstrdup(ctx
->device_out
);
231 xfree(ctx
->device_out
);
233 enter_rfmon_mac80211(ctx
->device_trans
, &ctx
->device_out
);
234 if (ctx
->link_type
!= LINKTYPE_IEEE802_11
&&
235 ctx
->link_type
!= LINKTYPE_IEEE802_11_RADIOTAP
)
236 panic("Wrong linktype of pcap!\n");
239 ifindex
= device_ifindex(ctx
->device_out
);
240 size
= ring_size(ctx
->device_out
, ctx
->reserve_size
);
242 bpf_parse_rules(ctx
->filter
, &bpf_ops
, ctx
->link_type
);
244 bpf_dump_all(&bpf_ops
);
246 ring_tx_setup(&tx_ring
, tx_sock
, size
, ifindex
, ctx
->jumbo
, ctx
->verbose
);
248 dissector_init_all(ctx
->print_mode
);
250 if (ctx
->cpu
>= 0 && ifindex
> 0) {
251 int irq
= device_irq_number(ctx
->device_out
);
252 device_set_irq_affinity(irq
, ctx
->cpu
);
255 printf("IRQ: %s:%d > CPU%d\n",
256 ctx
->device_out
, irq
, ctx
->cpu
);
260 interval
= ctx
->kpull
;
262 set_itimer_interval_value(&itimer
, 0, interval
);
263 setitimer(ITIMER_REAL
, &itimer
, NULL
);
265 drop_privileges(ctx
->enforce
, ctx
->uid
, ctx
->gid
);
267 printf("Running! Hang up with ^C!\n\n");
270 bug_on(gettimeofday(&start
, NULL
));
272 while (likely(sigint
== 0)) {
273 while (user_may_pull_from_tx(tx_ring
.frames
[it
].iov_base
)) {
274 hdr
= tx_ring
.frames
[it
].iov_base
;
275 out
= ((uint8_t *) hdr
) + TPACKET2_HDRLEN
- sizeof(struct sockaddr_ll
);
278 ret
= __pcap_io
->read_pcap(fd
, &phdr
, ctx
->magic
, out
,
279 ring_frame_size(&tx_ring
));
280 if (unlikely(ret
<= 0))
283 if (ring_frame_size(&tx_ring
) <
284 pcap_get_length(&phdr
, ctx
->magic
)) {
285 pcap_set_length(&phdr
, ctx
->magic
,
286 ring_frame_size(&tx_ring
));
289 } while (ctx
->filter
&&
290 !bpf_run_filter(&bpf_ops
, out
,
291 pcap_get_length(&phdr
, ctx
->magic
)));
293 pcap_pkthdr_to_tpacket_hdr(&phdr
, ctx
->magic
, &hdr
->tp_h
, NULL
);
295 ctx
->tx_bytes
+= hdr
->tp_h
.tp_len
;;
298 show_frame_hdr(out
, hdr
->tp_h
.tp_snaplen
,
299 ctx
->link_type
, hdr
, ctx
->print_mode
);
301 dissector_entry_point(out
, hdr
->tp_h
.tp_snaplen
,
302 ctx
->link_type
, ctx
->print_mode
);
304 kernel_may_pull_from_tx(&hdr
->tp_h
);
307 if (it
>= tx_ring
.layout
.tp_frame_nr
)
310 if (unlikely(sigint
== 1))
313 if (frame_count_max
!= 0) {
314 if (ctx
->tx_packets
>= frame_count_max
) {
323 bug_on(gettimeofday(&end
, NULL
));
324 timersub(&end
, &start
, &diff
);
328 bpf_release(&bpf_ops
);
330 dissector_cleanup_all();
331 destroy_tx_ring(tx_sock
, &tx_ring
);
334 leave_rfmon_mac80211(ctx
->device_out
);
336 if (__pcap_io
->prepare_close_pcap
)
337 __pcap_io
->prepare_close_pcap(fd
, PCAP_MODE_RD
);
339 if (!strncmp("-", ctx
->device_in
, strlen("-")))
340 dup2(fd
, fileno(stdin
));
347 printf("\r%12lu packets outgoing\n", ctx
->tx_packets
);
348 printf("\r%12lu packets truncated in file\n", trunced
);
349 printf("\r%12lu bytes outgoing\n", ctx
->tx_bytes
);
350 printf("\r%12lu sec, %lu usec in total\n", diff
.tv_sec
, diff
.tv_usec
);
353 static void receive_to_xmit(struct ctx
*ctx
)
357 int rx_sock
, ifindex_in
, ifindex_out
, ret
;
358 size_t size_in
, size_out
;
359 unsigned int it_in
= 0, it_out
= 0;
360 unsigned long frame_count
= 0;
361 struct frame_map
*hdr_in
, *hdr_out
;
362 struct ring tx_ring
, rx_ring
;
363 struct pollfd rx_poll
;
364 struct sock_fprog bpf_ops
;
366 if (!strncmp(ctx
->device_in
, ctx
->device_out
, IFNAMSIZ
))
367 panic("Ingress/egress devices must be different!\n");
368 if (!device_up_and_running(ctx
->device_out
))
369 panic("Egress device not up and running!\n");
371 rx_sock
= pf_socket();
372 tx_sock
= pf_socket();
374 ifindex_in
= device_ifindex(ctx
->device_in
);
375 ifindex_out
= device_ifindex(ctx
->device_out
);
377 size_in
= ring_size(ctx
->device_in
, ctx
->reserve_size
);
378 size_out
= ring_size(ctx
->device_out
, ctx
->reserve_size
);
380 enable_kernel_bpf_jit_compiler();
382 bpf_parse_rules(ctx
->filter
, &bpf_ops
, ctx
->link_type
);
384 bpf_dump_all(&bpf_ops
);
385 bpf_attach_to_sock(rx_sock
, &bpf_ops
);
387 ring_rx_setup(&rx_ring
, rx_sock
, size_in
, ifindex_in
, &rx_poll
, false, ctx
->jumbo
,
388 ctx
->verbose
, ctx
->fanout_group
, ctx
->fanout_type
);
389 ring_tx_setup(&tx_ring
, tx_sock
, size_out
, ifindex_out
, ctx
->jumbo
, ctx
->verbose
);
391 dissector_init_all(ctx
->print_mode
);
393 if (ctx
->promiscuous
)
394 ifflags
= device_enter_promiscuous_mode(ctx
->device_in
);
397 interval
= ctx
->kpull
;
399 set_itimer_interval_value(&itimer
, 0, interval
);
400 setitimer(ITIMER_REAL
, &itimer
, NULL
);
402 drop_privileges(ctx
->enforce
, ctx
->uid
, ctx
->gid
);
404 printf("Running! Hang up with ^C!\n\n");
407 while (likely(sigint
== 0)) {
408 while (user_may_pull_from_rx(rx_ring
.frames
[it_in
].iov_base
)) {
409 hdr_in
= rx_ring
.frames
[it_in
].iov_base
;
410 in
= ((uint8_t *) hdr_in
) + hdr_in
->tp_h
.tp_mac
;
414 if (ctx
->packet_type
!= -1)
415 if (ctx
->packet_type
!= hdr_in
->s_ll
.sll_pkttype
)
418 hdr_out
= tx_ring
.frames
[it_out
].iov_base
;
419 out
= ((uint8_t *) hdr_out
) + TPACKET2_HDRLEN
- sizeof(struct sockaddr_ll
);
421 while (!user_may_pull_from_tx(tx_ring
.frames
[it_out
].iov_base
) &&
424 next_rnd_slot(&it_out
, &tx_ring
);
427 if (it_out
>= tx_ring
.layout
.tp_frame_nr
)
431 hdr_out
= tx_ring
.frames
[it_out
].iov_base
;
432 out
= ((uint8_t *) hdr_out
) + TPACKET2_HDRLEN
- sizeof(struct sockaddr_ll
);
435 tpacket_hdr_clone(&hdr_out
->tp_h
, &hdr_in
->tp_h
);
436 fmemcpy(out
, in
, hdr_in
->tp_h
.tp_len
);
438 kernel_may_pull_from_tx(&hdr_out
->tp_h
);
440 next_rnd_slot(&it_out
, &tx_ring
);
443 if (it_out
>= tx_ring
.layout
.tp_frame_nr
)
447 show_frame_hdr(in
, hdr_in
->tp_h
.tp_snaplen
,
448 ctx
->link_type
, hdr_in
, ctx
->print_mode
);
450 dissector_entry_point(in
, hdr_in
->tp_h
.tp_snaplen
,
451 ctx
->link_type
, ctx
->print_mode
);
453 if (frame_count_max
!= 0) {
454 if (frame_count
>= frame_count_max
) {
461 kernel_may_pull_from_rx(&hdr_in
->tp_h
);
464 if (it_in
>= rx_ring
.layout
.tp_frame_nr
)
467 if (unlikely(sigint
== 1))
471 ret
= poll(&rx_poll
, 1, -1);
472 if (unlikely(ret
< 0)) {
474 panic("Poll failed!\n");
481 sock_rx_net_stats(rx_sock
, 0);
483 bpf_release(&bpf_ops
);
485 dissector_cleanup_all();
487 destroy_tx_ring(tx_sock
, &tx_ring
);
488 destroy_rx_ring(rx_sock
, &rx_ring
);
490 if (ctx
->promiscuous
)
491 device_leave_promiscuous_mode(ctx
->device_in
, ifflags
);
497 static void translate_pcap_to_txf(int fdo
, uint8_t *out
, size_t len
)
499 size_t bytes_done
= 0;
502 slprintf(bout
, sizeof(bout
), "{\n ");
503 write_or_die(fdo
, bout
, strlen(bout
));
505 while (bytes_done
< len
) {
506 slprintf(bout
, sizeof(bout
), "0x%02x,", out
[bytes_done
]);
507 write_or_die(fdo
, bout
, strlen(bout
));
511 if (bytes_done
% 10 == 0) {
512 slprintf(bout
, sizeof(bout
), "\n");
513 write_or_die(fdo
, bout
, strlen(bout
));
515 if (bytes_done
< len
) {
516 slprintf(bout
, sizeof(bout
), " ");
517 write_or_die(fdo
, bout
, strlen(bout
));
519 } else if (bytes_done
< len
) {
520 slprintf(bout
, sizeof(bout
), " ");
521 write_or_die(fdo
, bout
, strlen(bout
));
524 if (bytes_done
% 10 != 0) {
525 slprintf(bout
, sizeof(bout
), "\n");
526 write_or_die(fdo
, bout
, strlen(bout
));
529 slprintf(bout
, sizeof(bout
), "}\n\n");
530 write_or_die(fdo
, bout
, strlen(bout
));
533 static void read_pcap(struct ctx
*ctx
)
536 int ret
, fd
, fdo
= 0;
537 unsigned long trunced
= 0;
540 struct sock_fprog bpf_ops
;
542 struct timeval start
, end
, diff
;
543 bool is_out_pcap
= ctx
->device_out
&& strstr(ctx
->device_out
, ".pcap");
544 const struct pcap_file_ops
*pcap_out_ops
= pcap_ops
[PCAP_OPS_RW
];
548 if (!strncmp("-", ctx
->device_in
, strlen("-"))) {
549 fd
= dup_or_die(fileno(stdin
));
550 close(fileno(stdin
));
551 if (ctx
->pcap
== PCAP_OPS_MM
)
552 ctx
->pcap
= PCAP_OPS_SG
;
554 fd
= open_or_die(ctx
->device_in
, O_RDONLY
| O_LARGEFILE
| O_NOATIME
);
557 if (__pcap_io
->init_once_pcap
)
558 __pcap_io
->init_once_pcap();
560 ret
= __pcap_io
->pull_fhdr_pcap(fd
, &ctx
->magic
, &ctx
->link_type
);
562 panic("Error reading pcap header!\n");
564 if (__pcap_io
->prepare_access_pcap
) {
565 ret
= __pcap_io
->prepare_access_pcap(fd
, PCAP_MODE_RD
, ctx
->jumbo
);
567 panic("Error prepare reading pcap!\n");
570 fmemset(&fm
, 0, sizeof(fm
));
572 bpf_parse_rules(ctx
->filter
, &bpf_ops
, ctx
->link_type
);
574 bpf_dump_all(&bpf_ops
);
576 dissector_init_all(ctx
->print_mode
);
578 out_len
= round_up(1024 * 1024, RUNTIME_PAGE_SIZE
);
579 out
= xmalloc_aligned(out_len
, CO_CACHE_LINE_SIZE
);
581 if (ctx
->device_out
) {
582 if (!strncmp("-", ctx
->device_out
, strlen("-"))) {
583 fdo
= dup_or_die(fileno(stdout
));
584 close(fileno(stdout
));
586 fdo
= open_or_die_m(ctx
->device_out
, O_RDWR
| O_CREAT
|
587 O_TRUNC
| O_LARGEFILE
, DEFFILEMODE
);
592 ret
= pcap_out_ops
->push_fhdr_pcap(fdo
, ctx
->magic
,
595 panic("Error writing pcap header!\n");
598 drop_privileges(ctx
->enforce
, ctx
->uid
, ctx
->gid
);
600 printf("Running! Hang up with ^C!\n\n");
603 bug_on(gettimeofday(&start
, NULL
));
605 while (likely(sigint
== 0)) {
607 ret
= __pcap_io
->read_pcap(fd
, &phdr
, ctx
->magic
,
609 if (unlikely(ret
< 0))
612 if (unlikely(pcap_get_length(&phdr
, ctx
->magic
) == 0)) {
617 if (unlikely(pcap_get_length(&phdr
, ctx
->magic
) > out_len
)) {
618 pcap_set_length(&phdr
, ctx
->magic
, out_len
);
621 } while (ctx
->filter
&&
622 !bpf_run_filter(&bpf_ops
, out
,
623 pcap_get_length(&phdr
, ctx
->magic
)));
625 pcap_pkthdr_to_tpacket_hdr(&phdr
, ctx
->magic
, &fm
.tp_h
, &fm
.s_ll
);
627 ctx
->tx_bytes
+= fm
.tp_h
.tp_len
;
630 show_frame_hdr(out
, fm
.tp_h
.tp_snaplen
, ctx
->link_type
, &fm
,
633 dissector_entry_point(out
, fm
.tp_h
.tp_snaplen
,
634 ctx
->link_type
, ctx
->print_mode
);
637 size_t pcap_len
= pcap_get_length(&phdr
, ctx
->magic
);
638 int wlen
= pcap_out_ops
->write_pcap(fdo
, &phdr
,
641 if (unlikely(wlen
!= (int)pcap_get_total_length(&phdr
, ctx
->magic
)))
642 panic("Error writing to pcap!\n");
643 } else if (ctx
->device_out
) {
644 translate_pcap_to_txf(fdo
, out
, fm
.tp_h
.tp_snaplen
);
647 if (frame_count_max
!= 0) {
648 if (ctx
->tx_packets
>= frame_count_max
) {
656 bug_on(gettimeofday(&end
, NULL
));
657 timersub(&end
, &start
, &diff
);
659 bpf_release(&bpf_ops
);
661 dissector_cleanup_all();
663 if (__pcap_io
->prepare_close_pcap
)
664 __pcap_io
->prepare_close_pcap(fd
, PCAP_MODE_RD
);
670 printf("\r%12lu packets outgoing\n", ctx
->tx_packets
);
671 printf("\r%12lu packets truncated in file\n", trunced
);
672 printf("\r%12lu bytes outgoing\n", ctx
->tx_bytes
);
673 printf("\r%12lu sec, %lu usec in total\n", diff
.tv_sec
, diff
.tv_usec
);
675 if (!strncmp("-", ctx
->device_in
, strlen("-")))
676 dup2(fd
, fileno(stdin
));
679 if (ctx
->device_out
) {
680 if (!strncmp("-", ctx
->device_out
, strlen("-")))
681 dup2(fdo
, fileno(stdout
));
686 static void finish_multi_pcap_file(struct ctx
*ctx
, int fd
)
688 __pcap_io
->fsync_pcap(fd
);
690 if (__pcap_io
->prepare_close_pcap
)
691 __pcap_io
->prepare_close_pcap(fd
, PCAP_MODE_WR
);
695 fmemset(&itimer
, 0, sizeof(itimer
));
696 setitimer(ITIMER_REAL
, &itimer
, NULL
);
699 static int next_multi_pcap_file(struct ctx
*ctx
, int fd
)
704 __pcap_io
->fsync_pcap(fd
);
706 if (__pcap_io
->prepare_close_pcap
)
707 __pcap_io
->prepare_close_pcap(fd
, PCAP_MODE_WR
);
711 slprintf(fname
, sizeof(fname
), "%s/%s%lu.pcap", ctx
->device_out
,
712 ctx
->prefix
? : "dump-", time(NULL
));
714 fd
= open_or_die_m(fname
, O_RDWR
| O_CREAT
| O_TRUNC
|
715 O_LARGEFILE
, DEFFILEMODE
);
717 ret
= __pcap_io
->push_fhdr_pcap(fd
, ctx
->magic
, ctx
->link_type
);
719 panic("Error writing pcap header!\n");
721 if (__pcap_io
->prepare_access_pcap
) {
722 ret
= __pcap_io
->prepare_access_pcap(fd
, PCAP_MODE_WR
, true);
724 panic("Error prepare writing pcap!\n");
730 static int begin_multi_pcap_file(struct ctx
*ctx
)
737 if (ctx
->device_out
[strlen(ctx
->device_out
) - 1] == '/')
738 ctx
->device_out
[strlen(ctx
->device_out
) - 1] = 0;
740 slprintf(fname
, sizeof(fname
), "%s/%s%lu.pcap", ctx
->device_out
,
741 ctx
->prefix
? : "dump-", time(NULL
));
743 fd
= open_or_die_m(fname
, O_RDWR
| O_CREAT
| O_TRUNC
|
744 O_LARGEFILE
, DEFFILEMODE
);
746 ret
= __pcap_io
->push_fhdr_pcap(fd
, ctx
->magic
, ctx
->link_type
);
748 panic("Error writing pcap header!\n");
750 if (__pcap_io
->prepare_access_pcap
) {
751 ret
= __pcap_io
->prepare_access_pcap(fd
, PCAP_MODE_WR
, true);
753 panic("Error prepare writing pcap!\n");
756 if (ctx
->dump_mode
== DUMP_INTERVAL_TIME
) {
757 interval
= ctx
->dump_interval
;
759 set_itimer_interval_value(&itimer
, interval
, 0);
760 setitimer(ITIMER_REAL
, &itimer
, NULL
);
768 static void finish_single_pcap_file(struct ctx
*ctx
, int fd
)
770 __pcap_io
->fsync_pcap(fd
);
772 if (__pcap_io
->prepare_close_pcap
)
773 __pcap_io
->prepare_close_pcap(fd
, PCAP_MODE_WR
);
775 if (strncmp("-", ctx
->device_out
, strlen("-")))
778 dup2(fd
, fileno(stdout
));
781 static int begin_single_pcap_file(struct ctx
*ctx
)
787 if (!strncmp("-", ctx
->device_out
, strlen("-"))) {
788 fd
= dup_or_die(fileno(stdout
));
789 close(fileno(stdout
));
790 if (ctx
->pcap
== PCAP_OPS_MM
)
791 ctx
->pcap
= PCAP_OPS_SG
;
793 fd
= open_or_die_m(ctx
->device_out
,
794 O_RDWR
| O_CREAT
| O_TRUNC
|
795 O_LARGEFILE
, DEFFILEMODE
);
798 ret
= __pcap_io
->push_fhdr_pcap(fd
, ctx
->magic
, ctx
->link_type
);
800 panic("Error writing pcap header!\n");
802 if (__pcap_io
->prepare_access_pcap
) {
803 ret
= __pcap_io
->prepare_access_pcap(fd
, PCAP_MODE_WR
, true);
805 panic("Error prepare writing pcap!\n");
811 static void print_pcap_file_stats(int sock
, struct ctx
*ctx
)
814 struct tpacket_stats kstats
;
815 socklen_t slen
= sizeof(kstats
);
817 fmemset(&kstats
, 0, sizeof(kstats
));
819 ret
= getsockopt(sock
, SOL_PACKET
, PACKET_STATISTICS
, &kstats
, &slen
);
821 panic("Cannot get packet statistics!\n");
823 if (ctx
->print_mode
== PRINT_NONE
) {
824 printf(".(+%u/-%u)", kstats
.tp_packets
- kstats
.tp_drops
,
830 static void update_pcap_next_dump(struct ctx
*ctx
, unsigned long snaplen
, int *fd
, int sock
)
832 if (!dump_to_pcap(ctx
))
835 if (ctx
->dump_mode
== DUMP_INTERVAL_SIZE
) {
837 if (interval
> ctx
->dump_interval
) {
844 *fd
= next_multi_pcap_file(ctx
, *fd
);
848 print_pcap_file_stats(sock
, ctx
);
853 static void walk_t3_block(struct block_desc
*pbd
, struct ctx
*ctx
,
854 int sock
, int *fd
, unsigned long *frame_count
)
856 int num_pkts
= pbd
->h1
.num_pkts
, i
;
857 struct tpacket3_hdr
*hdr
;
858 struct sockaddr_ll
*sll
;
860 hdr
= (void *) ((uint8_t *) pbd
+ pbd
->h1
.offset_to_first_pkt
);
861 sll
= (void *) ((uint8_t *) hdr
+ TPACKET_ALIGN(sizeof(*hdr
)));
863 for (i
= 0; i
< num_pkts
&& likely(sigint
== 0); ++i
) {
864 uint8_t *packet
= ((uint8_t *) hdr
+ hdr
->tp_mac
);
867 if (ctx
->packet_type
!= -1)
868 if (ctx
->packet_type
!= sll
->sll_pkttype
)
873 if (dump_to_pcap(ctx
)) {
876 tpacket3_hdr_to_pcap_pkthdr(hdr
, sll
, &phdr
, ctx
->magic
);
878 ret
= __pcap_io
->write_pcap(*fd
, &phdr
, ctx
->magic
, packet
,
879 pcap_get_length(&phdr
, ctx
->magic
));
880 if (unlikely(ret
!= (int) pcap_get_total_length(&phdr
, ctx
->magic
)))
881 panic("Write error to pcap!\n");
884 __show_frame_hdr(packet
, hdr
->tp_snaplen
, ctx
->link_type
, sll
,
885 hdr
, ctx
->print_mode
, true);
887 dissector_entry_point(packet
, hdr
->tp_snaplen
, ctx
->link_type
,
890 hdr
= (void *) ((uint8_t *) hdr
+ hdr
->tp_next_offset
);
891 sll
= (void *) ((uint8_t *) hdr
+ TPACKET_ALIGN(sizeof(*hdr
)));
893 if (frame_count_max
!= 0) {
894 if (unlikely(*frame_count
>= frame_count_max
)) {
900 update_pcap_next_dump(ctx
, hdr
->tp_snaplen
, fd
, sock
);
903 #endif /* HAVE_TPACKET3 */
905 static void recv_only_or_dump(struct ctx
*ctx
)
908 int sock
, ifindex
, fd
= 0, ret
;
912 struct pollfd rx_poll
;
913 struct sock_fprog bpf_ops
;
914 struct timeval start
, end
, diff
;
915 unsigned long frame_count
= 0;
919 ifindex
= device_ifindex(ctx
->device_in
);
921 size
= ring_size(ctx
->device_in
, ctx
->reserve_size
);
923 enable_kernel_bpf_jit_compiler();
925 bpf_parse_rules(ctx
->filter
, &bpf_ops
, ctx
->link_type
);
927 bpf_dump_all(&bpf_ops
);
928 bpf_attach_to_sock(sock
, &bpf_ops
);
930 if (ctx
->hwtimestamp
) {
931 ret
= set_sockopt_hwtimestamp(sock
, ctx
->device_in
);
932 if (ret
== 0 && ctx
->verbose
)
933 printf("HW timestamping enabled\n");
936 ring_rx_setup(&rx_ring
, sock
, size
, ifindex
, &rx_poll
, is_defined(HAVE_TPACKET3
), true,
937 ctx
->verbose
, ctx
->fanout_group
, ctx
->fanout_type
);
939 dissector_init_all(ctx
->print_mode
);
941 if (ctx
->cpu
>= 0 && ifindex
> 0) {
942 int irq
= device_irq_number(ctx
->device_in
);
943 device_set_irq_affinity(irq
, ctx
->cpu
);
946 printf("IRQ: %s:%d > CPU%d\n",
947 ctx
->device_in
, irq
, ctx
->cpu
);
950 if (ctx
->promiscuous
)
951 ifflags
= device_enter_promiscuous_mode(ctx
->device_in
);
953 if (dump_to_pcap(ctx
) && __pcap_io
->init_once_pcap
)
954 __pcap_io
->init_once_pcap();
956 drop_privileges(ctx
->enforce
, ctx
->uid
, ctx
->gid
);
958 if (dump_to_pcap(ctx
)) {
961 ret
= stat(ctx
->device_out
, &stats
);
965 ctx
->dump_dir
= S_ISDIR(stats
.st_mode
);
968 fd
= begin_multi_pcap_file(ctx
);
970 fd
= begin_single_pcap_file(ctx
);
973 printf("Running! Hang up with ^C!\n\n");
976 bug_on(gettimeofday(&start
, NULL
));
978 while (likely(sigint
== 0)) {
980 struct block_desc
*pbd
;
982 while (user_may_pull_from_rx_block((pbd
= rx_ring
.frames
[it
].iov_base
))) {
983 walk_t3_block(pbd
, ctx
, sock
, &fd
, &frame_count
);
985 kernel_may_pull_from_rx_block(pbd
);
986 it
= (it
+ 1) % rx_ring
.layout3
.tp_block_nr
;
988 if (unlikely(sigint
== 1))
992 while (user_may_pull_from_rx(rx_ring
.frames
[it
].iov_base
)) {
993 struct frame_map
*hdr
= rx_ring
.frames
[it
].iov_base
;
994 uint8_t *packet
= ((uint8_t *) hdr
) + hdr
->tp_h
.tp_mac
;
997 if (ctx
->packet_type
!= -1)
998 if (ctx
->packet_type
!= hdr
->s_ll
.sll_pkttype
)
1003 if (unlikely(ring_frame_size(&rx_ring
) < hdr
->tp_h
.tp_snaplen
)) {
1004 /* XXX: silently ignore for now. We used to
1005 * report them with sock_rx_net_stats() */
1009 if (dump_to_pcap(ctx
)) {
1010 tpacket_hdr_to_pcap_pkthdr(&hdr
->tp_h
, &hdr
->s_ll
, &phdr
, ctx
->magic
);
1012 ret
= __pcap_io
->write_pcap(fd
, &phdr
, ctx
->magic
, packet
,
1013 pcap_get_length(&phdr
, ctx
->magic
));
1014 if (unlikely(ret
!= (int) pcap_get_total_length(&phdr
, ctx
->magic
)))
1015 panic("Write error to pcap!\n");
1018 show_frame_hdr(packet
, hdr
->tp_h
.tp_snaplen
,
1019 ctx
->link_type
, hdr
, ctx
->print_mode
);
1021 dissector_entry_point(packet
, hdr
->tp_h
.tp_snaplen
,
1022 ctx
->link_type
, ctx
->print_mode
);
1024 if (frame_count_max
!= 0) {
1025 if (unlikely(frame_count
>= frame_count_max
)) {
1032 kernel_may_pull_from_rx(&hdr
->tp_h
);
1033 it
= (it
+ 1) % rx_ring
.layout
.tp_frame_nr
;
1035 if (unlikely(sigint
== 1))
1038 update_pcap_next_dump(ctx
, hdr
->tp_h
.tp_snaplen
, &fd
, sock
);
1040 #endif /* HAVE_TPACKET3 */
1042 ret
= poll(&rx_poll
, 1, -1);
1043 if (unlikely(ret
< 0)) {
1045 panic("Poll failed!\n");
1049 bug_on(gettimeofday(&end
, NULL
));
1050 timersub(&end
, &start
, &diff
);
1052 if (!(ctx
->dump_dir
&& ctx
->print_mode
== PRINT_NONE
)) {
1053 sock_rx_net_stats(sock
, frame_count
);
1055 printf("\r%12lu sec, %lu usec in total\n",
1056 diff
.tv_sec
, diff
.tv_usec
);
1062 bpf_release(&bpf_ops
);
1063 dissector_cleanup_all();
1064 destroy_rx_ring(sock
, &rx_ring
);
1066 if (ctx
->promiscuous
)
1067 device_leave_promiscuous_mode(ctx
->device_in
, ifflags
);
1070 leave_rfmon_mac80211(ctx
->device_in
);
1072 if (dump_to_pcap(ctx
)) {
1074 finish_multi_pcap_file(ctx
, fd
);
1076 finish_single_pcap_file(ctx
, fd
);
1082 static void init_ctx(struct ctx
*ctx
)
1084 memset(ctx
, 0, sizeof(*ctx
));
1086 ctx
->uid
= getuid();
1087 ctx
->uid
= getgid();
1090 ctx
->packet_type
= -1;
1092 ctx
->fanout_type
= PACKET_FANOUT_ROLLOVER
;
1094 ctx
->magic
= ORIGINAL_TCPDUMP_MAGIC
;
1095 ctx
->print_mode
= PRINT_NORM
;
1096 ctx
->pcap
= PCAP_OPS_SG
;
1098 ctx
->dump_mode
= DUMP_INTERVAL_TIME
;
1099 ctx
->dump_interval
= 60;
1101 ctx
->promiscuous
= true;
1102 ctx
->randomize
= false;
1103 ctx
->hwtimestamp
= true;
1106 static void destroy_ctx(struct ctx
*ctx
)
1108 free(ctx
->device_in
);
1109 free(ctx
->device_out
);
1110 free(ctx
->device_trans
);
1115 static void __noreturn
help(void)
1117 printf("netsniff-ng %s, the packet sniffing beast\n", VERSION_STRING
);
1118 puts("http://www.netsniff-ng.org\n\n"
1119 "Usage: netsniff-ng [options] [filter-expression]\n"
1121 " -i|-d|--dev|--in <dev|pcap|-> Input source as netdev, pcap or pcap stdin\n"
1122 " -o|--out <dev|pcap|dir|cfg|-> Output sink as netdev, pcap, directory, trafgen, or stdout\n"
1123 " -C|--fanout-group <id> Join packet fanout group\n"
1124 " -K|--fanout-type <type> Apply fanout discipline: hash|lb|cpu|rnd|roll|qm\n"
1125 " -L|--fanout-opts <opts> Additional fanout options: defrag|roll\n"
1126 " -f|--filter <bpf-file|expr> Use BPF filter file from bpfc or tcpdump-like expression\n"
1127 " -t|--type <type> Filter for: host|broadcast|multicast|others|outgoing\n"
1128 " -F|--interval <size|time> Dump interval if -o is a dir: <num>KiB/MiB/GiB/s/sec/min/hrs\n"
1129 " -R|--rfraw Capture or inject raw 802.11 frames\n"
1130 " -n|--num <0|uint> Number of packets until exit (def: 0)\n"
1131 " -P|--prefix <name> Prefix for pcaps stored in directory\n"
1132 " -T|--magic <pcap-magic> Pcap magic number/pcap format to store, see -D\n"
1133 " -D|--dump-pcap-types Dump pcap types and magic numbers and quit\n"
1134 " -B|--dump-bpf Dump generated BPF assembly\n"
1135 " -r|--rand Randomize packet forwarding order (dev->dev)\n"
1136 " -M|--no-promisc No promiscuous mode for netdev\n"
1137 " -A|--no-sock-mem Don't tune core socket memory\n"
1138 " -N|--no-hwtimestamp Disable hardware time stamping\n"
1139 " -m|--mmap Mmap(2) pcap file I/O, e.g. for replaying pcaps\n"
1140 " -G|--sg Scatter/gather pcap file I/O\n"
1141 " -c|--clrw Use slower read(2)/write(2) I/O\n"
1142 " -S|--ring-size <size> Specify ring size to: <num>KiB/MiB/GiB\n"
1143 " -k|--kernel-pull <uint> Kernel pull from user interval in us (def: 10us)\n"
1144 " -J|--jumbo-support Support replay/fwd 64KB Super Jumbo Frames (def: 2048B)\n"
1145 " -b|--bind-cpu <cpu> Bind to specific CPU\n"
1146 " -u|--user <userid> Drop privileges and change to userid\n"
1147 " -g|--group <groupid> Drop privileges and change to groupid\n"
1148 " -H|--prio-high Make this high priority process\n"
1149 " -Q|--notouch-irq Do not touch IRQ CPU affinity of NIC\n"
1150 " -s|--silent Do not print captured packets\n"
1151 " -q|--less Print less-verbose packet information\n"
1152 " -X|--hex Print packet data in hex format\n"
1153 " -l|--ascii Print human-readable packet data\n"
1154 " -U|--update Update GeoIP databases\n"
1155 " -V|--verbose Be more verbose\n"
1156 " -v|--version Show version and exit\n"
1157 " -h|--help Guess what?!\n\n"
1159 " netsniff-ng --in eth0 --out dump.pcap -s -T 0xa1b2c3d4 --b 0 tcp or udp\n"
1160 " netsniff-ng --in wlan0 --rfraw --out dump.pcap --silent --bind-cpu 0\n"
1161 " netsniff-ng --in dump.pcap --mmap --out eth0 -k1000 --silent --bind-cpu 0\n"
1162 " netsniff-ng --in dump.pcap --out dump.cfg --silent --bind-cpu 0\n"
1163 " netsniff-ng --in dump.pcap --out dump2.pcap --silent tcp\n"
1164 " netsniff-ng --in eth0 --out eth1 --silent --bind-cpu 0 -J --type host\n"
1165 " netsniff-ng --in eth1 --out /opt/probe/ -s -m --interval 100MiB -b 0\n"
1166 " netsniff-ng --in vlan0 --out dump.pcap -c -u `id -u bob` -g `id -g bob`\n"
1167 " netsniff-ng --in any --filter http.bpf --jumbo-support --ascii -V\n\n"
1169 " For introducing bit errors, delays with random variation and more\n"
1170 " while replaying pcaps, make use of tc(8) with its disciplines (e.g. netem).\n");
1175 static void __noreturn
version(void)
1177 printf("netsniff-ng %s, Git id: %s\n", VERSION_LONG
, GITVERSION
);
1178 puts("the packet sniffing beast\n"
1179 "http://www.netsniff-ng.org\n");
1184 int main(int argc
, char **argv
)
1187 int c
, i
, j
, cpu_tmp
, opt_index
, ops_touched
= 0, vals
[4] = {0};
1188 bool prio_high
= false, setsockmem
= true;
1189 void (*main_loop
)(struct ctx
*ctx
) = NULL
;
1195 while ((c
= getopt_long(argc
, argv
, short_options
, long_options
,
1196 &opt_index
)) != EOF
) {
1200 ctx
.device_in
= xstrdup(optarg
);
1203 ctx
.device_out
= xstrdup(optarg
);
1206 ctx
.prefix
= xstrdup(optarg
);
1212 ctx
.randomize
= true;
1218 ctx
.magic
= (uint32_t) strtoul(optarg
, NULL
, 0);
1219 pcap_check_magic(ctx
.magic
);
1222 ctx
.filter
= xstrdup(optarg
);
1225 ctx
.promiscuous
= false;
1228 ctx
.hwtimestamp
= false;
1234 ctx
.uid
= strtoul(optarg
, NULL
, 0);
1238 ctx
.gid
= strtoul(optarg
, NULL
, 0);
1242 ctx
.fanout_group
= strtoul(optarg
, NULL
, 0);
1243 if (ctx
.fanout_group
== 0)
1244 panic("Non-zero fanout group id required!\n");
1247 if (!strncmp(optarg
, "hash", strlen("hash")))
1248 ctx
.fanout_type
= PACKET_FANOUT_HASH
;
1249 else if (!strncmp(optarg
, "lb", strlen("lb")))
1250 ctx
.fanout_type
= PACKET_FANOUT_LB
;
1251 else if (!strncmp(optarg
, "cpu", strlen("cpu")))
1252 ctx
.fanout_type
= PACKET_FANOUT_CPU
;
1253 else if (!strncmp(optarg
, "rnd", strlen("rnd")))
1254 ctx
.fanout_type
= PACKET_FANOUT_RND
;
1255 else if (!strncmp(optarg
, "roll", strlen("roll")))
1256 ctx
.fanout_type
= PACKET_FANOUT_ROLLOVER
;
1257 else if (!strncmp(optarg
, "qm", strlen("qm")))
1258 ctx
.fanout_type
= PACKET_FANOUT_QM
;
1260 panic("Unkown fanout type!\n");
1263 if (!strncmp(optarg
, "defrag", strlen("defrag")))
1264 ctx
.fanout_type
|= PACKET_FANOUT_FLAG_DEFRAG
;
1265 else if (!strncmp(optarg
, "roll", strlen("roll")))
1266 ctx
.fanout_type
|= PACKET_FANOUT_FLAG_ROLLOVER
;
1268 panic("Unkown fanout option!\n");
1271 if (!strncmp(optarg
, "host", strlen("host")))
1272 ctx
.packet_type
= PACKET_HOST
;
1273 else if (!strncmp(optarg
, "broadcast", strlen("broadcast")))
1274 ctx
.packet_type
= PACKET_BROADCAST
;
1275 else if (!strncmp(optarg
, "multicast", strlen("multicast")))
1276 ctx
.packet_type
= PACKET_MULTICAST
;
1277 else if (!strncmp(optarg
, "others", strlen("others")))
1278 ctx
.packet_type
= PACKET_OTHERHOST
;
1279 else if (!strncmp(optarg
, "outgoing", strlen("outgoing")))
1280 ctx
.packet_type
= PACKET_OUTGOING
;
1282 ctx
.packet_type
= -1;
1286 for (j
= i
= strlen(optarg
); i
> 0; --i
) {
1287 if (!isdigit(optarg
[j
- i
]))
1292 if (!strncmp(ptr
, "KiB", strlen("KiB")))
1293 ctx
.reserve_size
= 1 << 10;
1294 else if (!strncmp(ptr
, "MiB", strlen("MiB")))
1295 ctx
.reserve_size
= 1 << 20;
1296 else if (!strncmp(ptr
, "GiB", strlen("GiB")))
1297 ctx
.reserve_size
= 1 << 30;
1299 panic("Syntax error in ring size param!\n");
1301 ctx
.reserve_size
*= strtoul(optarg
, NULL
, 0);
1304 cpu_tmp
= strtol(optarg
, NULL
, 0);
1306 cpu_affinity(cpu_tmp
);
1314 ctx
.pcap
= PCAP_OPS_RW
;
1318 ctx
.pcap
= PCAP_OPS_MM
;
1322 ctx
.pcap
= PCAP_OPS_SG
;
1329 ctx
.print_mode
= PRINT_NONE
;
1332 ctx
.print_mode
= PRINT_LESS
;
1336 (ctx
.print_mode
== PRINT_ASCII
) ?
1337 PRINT_HEX_ASCII
: PRINT_HEX
;
1341 (ctx
.print_mode
== PRINT_HEX
) ?
1342 PRINT_HEX_ASCII
: PRINT_ASCII
;
1345 ctx
.kpull
= strtoul(optarg
, NULL
, 0);
1348 frame_count_max
= strtoul(optarg
, NULL
, 0);
1352 for (j
= i
= strlen(optarg
); i
> 0; --i
) {
1353 if (!isdigit(optarg
[j
- i
]))
1358 if (!strncmp(ptr
, "KiB", strlen("KiB"))) {
1359 ctx
.dump_interval
= 1 << 10;
1360 ctx
.dump_mode
= DUMP_INTERVAL_SIZE
;
1361 } else if (!strncmp(ptr
, "MiB", strlen("MiB"))) {
1362 ctx
.dump_interval
= 1 << 20;
1363 ctx
.dump_mode
= DUMP_INTERVAL_SIZE
;
1364 } else if (!strncmp(ptr
, "GiB", strlen("GiB"))) {
1365 ctx
.dump_interval
= 1 << 30;
1366 ctx
.dump_mode
= DUMP_INTERVAL_SIZE
;
1367 } else if (!strncmp(ptr
, "sec", strlen("sec"))) {
1368 ctx
.dump_interval
= 1;
1369 ctx
.dump_mode
= DUMP_INTERVAL_TIME
;
1370 } else if (!strncmp(ptr
, "min", strlen("min"))) {
1371 ctx
.dump_interval
= 60;
1372 ctx
.dump_mode
= DUMP_INTERVAL_TIME
;
1373 } else if (!strncmp(ptr
, "hrs", strlen("hrs"))) {
1374 ctx
.dump_interval
= 60 * 60;
1375 ctx
.dump_mode
= DUMP_INTERVAL_TIME
;
1376 } else if (!strncmp(ptr
, "s", strlen("s"))) {
1377 ctx
.dump_interval
= 1;
1378 ctx
.dump_mode
= DUMP_INTERVAL_TIME
;
1380 panic("Syntax error in time/size param!\n");
1383 ctx
.dump_interval
*= strtoul(optarg
, NULL
, 0);
1389 ctx
.dump_bpf
= true;
1392 pcap_dump_type_features();
1422 panic("Option -%c requires an argument!\n",
1425 if (isprint(optopt
))
1426 printf("Unknown option character `0x%X\'!\n", optopt
);
1434 if (!ctx
.filter
&& optind
!= argc
) {
1438 for (i
= optind
; i
< argc
; ++i
) {
1439 size_t alen
= strlen(argv
[i
]) + 2;
1440 size_t flen
= ctx
.filter
? strlen(ctx
.filter
) : 0;
1442 ctx
.filter
= xrealloc(ctx
.filter
, flen
+ alen
);
1443 ret
= slprintf(ctx
.filter
+ offset
, strlen(argv
[i
]) + 2, "%s ", argv
[i
]);
1445 panic("Cannot concatenate filter string!\n");
1452 ctx
.device_in
= xstrdup("any");
1454 register_signal(SIGINT
, signal_handler
);
1455 register_signal(SIGQUIT
, signal_handler
);
1456 register_signal(SIGTERM
, signal_handler
);
1457 register_signal(SIGHUP
, signal_handler
);
1463 set_sched_status(SCHED_FIFO
, sched_get_priority_max(SCHED_FIFO
));
1466 if (device_mtu(ctx
.device_in
) || !strncmp("any", ctx
.device_in
, strlen(ctx
.device_in
))) {
1468 ctx
.device_trans
= xstrdup(ctx
.device_in
);
1469 xfree(ctx
.device_in
);
1471 enter_rfmon_mac80211(ctx
.device_trans
, &ctx
.device_in
);
1474 ctx
.link_type
= pcap_devtype_to_linktype(ctx
.device_in
);
1476 if (!ctx
.device_out
) {
1478 main_loop
= recv_only_or_dump
;
1479 } else if (device_mtu(ctx
.device_out
)) {
1480 register_signal_f(SIGALRM
, timer_elapsed
, SA_SIGINFO
);
1481 main_loop
= receive_to_xmit
;
1484 register_signal_f(SIGALRM
, timer_next_dump
, SA_SIGINFO
);
1485 main_loop
= recv_only_or_dump
;
1487 ctx
.pcap
= PCAP_OPS_SG
;
1490 if (ctx
.device_out
&& device_mtu(ctx
.device_out
)) {
1491 register_signal_f(SIGALRM
, timer_elapsed
, SA_SIGINFO
);
1492 main_loop
= pcap_to_xmit
;
1494 ctx
.pcap
= PCAP_OPS_MM
;
1496 main_loop
= read_pcap
;
1498 ctx
.pcap
= PCAP_OPS_SG
;
1506 set_system_socket_memory(vals
, array_size(vals
));
1511 printf("pcap file I/O method: %s\n", pcap_ops_group_to_str
[ctx
.pcap
]);
1518 reset_system_socket_memory(vals
, array_size(vals
));
1521 device_restore_irq_affinity_list();