1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
|
/* $OpenBSD: if_pflow.c,v 1.3 2008/09/16 15:48:12 gollo Exp $ */
/*
* Copyright (c) 2008 Henning Brauer <henning@openbsd.org>
* Copyright (c) 2008 Joerg Goltermann <jg@osn.de>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/malloc.h>
#include <sys/param.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <dev/rndvar.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/bpf.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netinet/tcp.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet/in_pcb.h>
#endif /* INET */
#include <net/pfvar.h>
#include <net/if_pflow.h>
#include "bpfilter.h"
#include "pflow.h"
#define PFLOW_MINMTU \
(sizeof(struct pflow_header) + sizeof(struct pflow_flow))
#ifdef PFLOWDEBUG
#define DPRINTF(x) do { printf x ; } while (0)
#else
#define DPRINTF(x)
#endif
struct pflow_softc *pflowif = NULL;
struct pflowstats pflowstats;
void pflowattach(int);
int pflow_clone_create(struct if_clone *, int);
int pflow_clone_destroy(struct ifnet *);
void pflow_setmtu(struct pflow_softc *, int);
int pflowoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *);
int pflowioctl(struct ifnet *, u_long, caddr_t);
void pflowstart(struct ifnet *);
struct mbuf *pflow_get_mbuf(struct pflow_softc *, void **);
int pflow_sendout(struct pflow_softc *);
int pflow_sendout_mbuf(struct pflow_softc *, struct mbuf *);
void pflow_timeout(void *);
void copy_flow_data(struct pflow_flow *, struct pflow_flow *,
struct pf_state *, int, int);
int pflow_pack_flow(struct pf_state *);
int pflow_get_dynport(void);
struct if_clone pflow_cloner =
IF_CLONE_INITIALIZER("pflow", pflow_clone_create,
pflow_clone_destroy);
/* from in_pcb.c */
extern int ipport_hifirstauto;
extern int ipport_hilastauto;
void
pflowattach(int npflow)
{
if_clone_attach(&pflow_cloner);
}
int
pflow_clone_create(struct if_clone *ifc, int unit)
{
struct ifnet *ifp;
if (unit != 0)
return (EINVAL);
if ((pflowif = malloc(sizeof(*pflowif),
M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL)
return (ENOMEM);
pflowif->sc_sender_ip.s_addr = INADDR_ANY;
pflowif->sc_sender_port = pflow_get_dynport();
pflowif->sc_imo.imo_membership = malloc(
(sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_IPMOPTS,
M_WAITOK|M_ZERO);
pflowif->sc_imo.imo_max_memberships = IP_MIN_MEMBERSHIPS;
pflowif->sc_receiver_ip.s_addr = 0;
pflowif->sc_receiver_port = 0;
pflowif->sc_sender_ip.s_addr = INADDR_ANY;
pflowif->sc_sender_port = pflow_get_dynport();
ifp = &pflowif->sc_if;
snprintf(ifp->if_xname, sizeof ifp->if_xname, "pflow%d", unit);
ifp->if_softc = pflowif;
ifp->if_ioctl = pflowioctl;
ifp->if_output = pflowoutput;
ifp->if_start = pflowstart;
ifp->if_type = IFT_PFLOW;
ifp->if_snd.ifq_maxlen = ifqmaxlen;
ifp->if_hdrlen = PFLOW_HDRLEN;
ifp->if_flags = IFF_UP;
ifp->if_flags &= ~IFF_RUNNING; /* not running, need receiver */
pflow_setmtu(pflowif, ETHERMTU);
timeout_set(&pflowif->sc_tmo, pflow_timeout, pflowif);
if_attach(ifp);
if_alloc_sadl(ifp);
return (0);
}
int
pflow_clone_destroy(struct ifnet *ifp)
{
struct pflow_softc *sc = ifp->if_softc;
timeout_del(&sc->sc_tmo);
#if NBPFILTER > 0
bpfdetach(ifp);
#endif
if_detach(ifp);
free(pflowif->sc_imo.imo_membership, M_IPMOPTS);
free(pflowif, M_DEVBUF);
pflowif = NULL;
return (0);
}
/*
* Start output on the pflow interface.
*/
void
pflowstart(struct ifnet *ifp)
{
struct mbuf *m;
int s;
for (;;) {
s = splnet();
IF_DROP(&ifp->if_snd);
IF_DEQUEUE(&ifp->if_snd, m);
splx(s);
if (m == NULL)
return;
m_freem(m);
}
}
int
pflowoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
struct rtentry *rt)
{
m_freem(m);
return (0);
}
/* ARGSUSED */
int
pflowioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct proc *p = curproc;
struct pflow_softc *sc = ifp->if_softc;
struct ifreq *ifr = (struct ifreq *)data;
struct pflowreq pflowr;
int s, error;
switch (cmd) {
case SIOCSIFADDR:
case SIOCAIFADDR:
case SIOCSIFDSTADDR:
case SIOCSIFFLAGS:
if ((ifp->if_flags & IFF_UP) &&
sc->sc_receiver_ip.s_addr != 0 &&
sc->sc_receiver_port != 0)
ifp->if_flags |= IFF_RUNNING;
else
ifp->if_flags &= ~IFF_RUNNING;
break;
case SIOCSIFMTU:
if (ifr->ifr_mtu < PFLOW_MINMTU)
return (EINVAL);
if (ifr->ifr_mtu > MCLBYTES)
ifr->ifr_mtu = MCLBYTES;
s = splnet();
if (ifr->ifr_mtu < ifp->if_mtu)
pflow_sendout(sc);
pflow_setmtu(sc, ifr->ifr_mtu);
splx(s);
break;
case SIOCGETPFLOW:
bzero(&pflowr, sizeof(pflowr));
pflowr.sender_ip = sc->sc_sender_ip;
pflowr.receiver_ip = sc->sc_receiver_ip;
pflowr.receiver_port = sc->sc_receiver_port;
if ((error = copyout(&pflowr, ifr->ifr_data,
sizeof(pflowr))))
return (error);
break;
case SIOCSETPFLOW:
if ((error = suser(p, p->p_acflag)) != 0)
return (error);
if ((error = copyin(ifr->ifr_data, &pflowr,
sizeof(pflowr))))
return (error);
if ((ifp->if_flags & IFF_UP) && sc->sc_receiver_ip.s_addr != 0
&& sc->sc_receiver_port != 0) {
s = splnet();
pflow_sendout(sc);
splx(s);
}
if (pflowr.addrmask & PFLOW_MASK_DSTIP)
sc->sc_receiver_ip = pflowr.receiver_ip;
if (pflowr.addrmask & PFLOW_MASK_DSTPRT)
sc->sc_receiver_port = pflowr.receiver_port;
if (pflowr.addrmask & PFLOW_MASK_SRCIP)
sc->sc_sender_ip.s_addr = pflowr.sender_ip.s_addr;
if ((ifp->if_flags & IFF_UP) &&
sc->sc_receiver_ip.s_addr != 0 &&
sc->sc_receiver_port != 0)
ifp->if_flags |= IFF_RUNNING;
else
ifp->if_flags &= ~IFF_RUNNING;
break;
default:
return (ENOTTY);
}
return (0);
}
void
pflow_setmtu(struct pflow_softc *sc, int mtu_req)
{
int mtu;
if (sc->sc_pflow_ifp && sc->sc_pflow_ifp->if_mtu < mtu_req)
mtu = sc->sc_pflow_ifp->if_mtu;
else
mtu = mtu_req;
sc->sc_maxcount = (mtu - sizeof(struct pflow_header)) /
sizeof(struct pflow_flow);
if (sc->sc_maxcount > PFLOW_MAXFLOWS)
sc->sc_maxcount = PFLOW_MAXFLOWS;
sc->sc_if.if_mtu = sizeof(struct pflow_header) +
sc->sc_maxcount * sizeof(struct pflow_flow);
}
struct mbuf *
pflow_get_mbuf(struct pflow_softc *sc, void **sp)
{
struct pflow_header *h;
struct mbuf *m, *top = NULL, **mp = ⊤
int len, totlen;
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL) {
sc->sc_if.if_oerrors++;
return (NULL);
}
len = MHLEN;
totlen = (sc->sc_maxcount * sizeof(struct pflow_flow)) +
sizeof(struct pflow_header);
while (totlen > 0) {
if (top) {
MGET(m, M_DONTWAIT, MT_DATA);
if (m == 0) {
m_freem(top);
sc->sc_if.if_oerrors++;
return (NULL);
}
len = MLEN;
}
if (totlen >= MINCLSIZE) {
MCLGET(m, M_DONTWAIT);
if (m->m_flags & M_EXT)
len = MCLBYTES;
else {
m_free(m);
m_freem(top);
sc->sc_if.if_oerrors++;
return (NULL);
}
}
m->m_len = len = min(totlen, len);
totlen -= len;
*mp = m;
mp = &m->m_next;
}
top->m_pkthdr.rcvif = NULL;
top->m_len = m->m_pkthdr.len = sizeof(struct pflow_header);
/* populate pflow_header */
h = mtod(top, struct pflow_header *);
h->reserved1 = 0;
h->reserved2 = 0;
h->count = 0;
h->version = htons(PFLOW_VERSION);
h->flow_sequence = htonl(sc->sc_gcounter);
h->engine_type = PFLOW_ENGINE_TYPE;
h->engine_id = PFLOW_ENGINE_ID;
sc->sc_count = 0;
*sp = (void *)((char *)h + PFLOW_HDRLEN);
timeout_add_sec(&sc->sc_tmo, PFLOW_TIMEOUT);
return (top);
}
void
copy_flow_data(struct pflow_flow *flow1, struct pflow_flow *flow2,
struct pf_state *st, int src, int dst)
{
struct pf_state_key *sk = st->key[PF_SK_WIRE];
flow1->src_ip = flow2->dest_ip =
st->key[PF_SK_WIRE]->addr[src].v4.s_addr;
flow1->src_port = flow2->dest_port = st->key[PF_SK_WIRE]->port[src];
flow1->dest_ip = flow2->src_ip =
st->key[PF_SK_WIRE]->addr[dst].v4.s_addr;
flow1->dest_port = flow2->src_port = st->key[PF_SK_WIRE]->port[dst];
flow1->dest_as = flow2->src_as =
flow1->src_as = flow2->dest_as = 0;
flow1->if_index_out = flow2->if_index_in =
flow1->if_index_in = flow2->if_index_out = 0;
flow1->dest_mask = flow2->src_mask =
flow1->src_mask = flow2->dest_mask = 0;
flow1->flow_packets = htonl(st->packets[0]);
flow2->flow_packets = htonl(st->packets[1]);
flow1->flow_octets = htonl(st->bytes[0]);
flow2->flow_octets = htonl(st->bytes[1]);
flow1->flow_start = flow2->flow_start = htonl(st->creation * 1000);
flow1->flow_finish = flow2->flow_finish = htonl(time_second * 1000);
flow1->tcp_flags = flow2->tcp_flags = 0;
flow1->protocol = flow2->protocol = sk->proto;
flow1->tos = flow2->tos = st->rule.ptr->tos;
}
int
export_pflow(struct pf_state *st)
{
struct pf_state pfs_copy;
struct pflow_softc *sc = pflowif;
struct ifnet *ifp = NULL;
u_int64_t bytes[2];
int ret = 0;
if (sc == NULL)
return (0);
ifp = &sc->sc_if;
if (!(ifp->if_flags & IFF_UP))
return (0);
if ((st->bytes[0] < (u_int64_t)PFLOW_MAXBYTES)
&& (st->bytes[1] < (u_int64_t)PFLOW_MAXBYTES))
return pflow_pack_flow(st);
/* flow > PFLOW_MAXBYTES need special handling */
bcopy(st, &pfs_copy, sizeof(pfs_copy));
bytes[0] = pfs_copy.bytes[0];
bytes[1] = pfs_copy.bytes[1];
while (bytes[0] > PFLOW_MAXBYTES) {
pfs_copy.bytes[0] = PFLOW_MAXBYTES;
pfs_copy.bytes[1] = 0;
if ((ret = pflow_pack_flow(&pfs_copy)) != 0)
return (ret);
if ((bytes[0] - PFLOW_MAXBYTES) > 0)
bytes[0] -= PFLOW_MAXBYTES;
}
while (bytes[1] > (u_int64_t)PFLOW_MAXBYTES) {
pfs_copy.bytes[1] = PFLOW_MAXBYTES;
pfs_copy.bytes[0] = 0;
if ((ret = pflow_pack_flow(&pfs_copy)) != 0)
return (ret);
if ((bytes[1] - PFLOW_MAXBYTES) > 0)
bytes[1] -= PFLOW_MAXBYTES;
}
pfs_copy.bytes[0] = bytes[0];
pfs_copy.bytes[1] = bytes[1];
return (pflow_pack_flow(&pfs_copy));
}
int
pflow_pack_flow(struct pf_state *st)
{
struct pflow_softc *sc = pflowif;
struct pflow_flow *flow1 = NULL;
struct pflow_flow flow2;
struct pf_state_key *sk = st->key[PF_SK_WIRE];
int s, ret = 0;
if (sk->af != AF_INET)
return (0);
s = splnet();
if (sc->sc_mbuf == NULL) {
if ((sc->sc_mbuf = pflow_get_mbuf(sc,
(void **)&sc->sc_flowp.s)) == NULL) {
splx(s);
return (ENOMEM);
}
}
pflowstats.pflow_flows++;
sc->sc_gcounter++;
sc->sc_count++;
flow1 = sc->sc_flowp.s++;
sc->sc_mbuf->m_pkthdr.len =
sc->sc_mbuf->m_len += sizeof(struct pflow_flow);
bzero(flow1, sizeof(*flow1));
bzero(&flow2, sizeof(flow2));
if (st->direction == PF_OUT)
copy_flow_data(flow1, &flow2, st, 1, 0);
else
copy_flow_data(flow1, &flow2, st, 0, 1);
if (st->bytes[0] != 0) { /* first flow from state */
if (sc->sc_count >= sc->sc_maxcount)
ret = pflow_sendout(sc);
if (st->bytes[1] != 0) {
/* one more flow, second part from state */
if (sc->sc_mbuf == NULL) {
if ((sc->sc_mbuf = pflow_get_mbuf(sc,
(void **)&sc->sc_flowp.s)) == NULL) {
splx(s);
return (ENOMEM);
}
}
pflowstats.pflow_flows++;
sc->sc_gcounter++;
sc->sc_count++;
flow1 = sc->sc_flowp.s++;
sc->sc_mbuf->m_pkthdr.len =
sc->sc_mbuf->m_len += sizeof(struct pflow_flow);
bzero(flow1, sizeof(*flow1));
}
}
if (st->bytes[1] != 0) { /* second flow from state */
bcopy(&flow2, flow1, sizeof(*flow1));
if (sc->sc_count >= sc->sc_maxcount)
ret = pflow_sendout(sc);
}
splx(s);
return (ret);
}
void
pflow_timeout(void *v)
{
struct pflow_softc *sc = v;
int s;
s = splnet();
pflow_sendout(sc);
splx(s);
}
/* This must be called in splnet() */
int
pflow_sendout(struct pflow_softc *sc)
{
struct mbuf *m;
struct pflow_header *h;
#if NBPFILTER > 0
struct ifnet *ifp = &sc->sc_if;
#endif
timeout_del(&sc->sc_tmo);
if (sc->sc_mbuf == NULL)
return (0);
pflowstats.pflow_packets++;
if (!(ifp->if_flags & IFF_RUNNING)) {
m_freem(m);
return (0);
}
m = sc->sc_mbuf;
sc->sc_mbuf = NULL;
sc->sc_flowp.s = NULL;
h = mtod(m, struct pflow_header *);
h->count = htons(sc->sc_count);
/* populate pflow_header */
h->uptime_ms = htonl(time_uptime * 1000);
h->time_sec = htonl(time_second);
h->time_nanosec = htonl(ticks);
#if NBPFILTER > 0
if (ifp->if_bpf)
bpf_mtap(ifp->if_bpf, m, BPF_DIRECTION_OUT);
#endif
return (pflow_sendout_mbuf(sc, m));
}
int
pflow_sendout_mbuf(struct pflow_softc *sc, struct mbuf *m)
{
struct udpiphdr *ui;
int len = m->m_pkthdr.len;
/* UDP Header*/
M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
if (m == NULL) {
pflowstats.pflow_onomem++;
return (0);
}
ui = mtod(m, struct udpiphdr *);
ui->ui_pr = IPPROTO_UDP;
ui->ui_len = htons((u_int16_t) len + sizeof (struct udphdr));
ui->ui_src = sc->sc_sender_ip;
ui->ui_sport = sc->sc_sender_port;
ui->ui_dst = sc->sc_receiver_ip;
ui->ui_dport = sc->sc_receiver_port;
ui->ui_ulen = ui->ui_len;
((struct ip *)ui)->ip_v = IPVERSION;
((struct ip *)ui)->ip_hl = sizeof(struct ip) >> 2;
((struct ip *)ui)->ip_id = htons(ip_randomid());
((struct ip *)ui)->ip_off = htons(IP_DF);
((struct ip *)ui)->ip_tos = IPTOS_LOWDELAY;
((struct ip *)ui)->ip_ttl = IPDEFTTL;
((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
/*
* Compute the pseudo-header checksum; defer further checksumming
* until ip_output() or hardware (if it exists).
*/
m->m_pkthdr.csum_flags |= M_UDPV4_CSUM_OUT;
ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
ui->ui_dst.s_addr, htons((u_int16_t)len +
sizeof(struct udphdr) + IPPROTO_UDP));
if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL))
pflowstats.pflow_oerrors++;
return (0);
}
int
pflow_get_dynport(void)
{
u_int16_t tmp, low, high, cut;
low = ipport_hifirstauto; /* sysctl */
high = ipport_hilastauto;
cut = arc4random_uniform(1 + high - low) + low;
for (tmp = cut; tmp <= high; ++(tmp)) {
if (!in_baddynamic(tmp, IPPROTO_UDP))
return (htons(tmp));
}
for (tmp = cut - 1; tmp >= low; --(tmp)) {
if (!in_baddynamic(tmp, IPPROTO_UDP))
return (htons(tmp));
}
return (htons(ipport_hilastauto)); /* XXX */
}
int
pflow_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp,
void *newp, size_t newlen)
{
if (namelen != 1)
return (ENOTDIR);
switch (name[0]) {
case NET_PFLOW_STATS:
if (newp != NULL)
return (EPERM);
return (sysctl_struct(oldp, oldlenp, newp, newlen,
&pflowstats, sizeof(pflowstats)));
default:
return (EOPNOTSUPP);
}
return (0);
}
|