pcap-bpf.c revision 235426
117683Spst/* 239291Sfenner * Copyright (c) 1993, 1994, 1995, 1996, 1998 317683Spst * The Regents of the University of California. All rights reserved. 417683Spst * 517683Spst * Redistribution and use in source and binary forms, with or without 617683Spst * modification, are permitted provided that: (1) source code distributions 717683Spst * retain the above copyright notice and this paragraph in its entirety, (2) 817683Spst * distributions including binary code include the above copyright notice and 917683Spst * this paragraph in its entirety in the documentation or other materials 1017683Spst * provided with the distribution, and (3) all advertising materials mentioning 1117683Spst * features or use of this software display the following acknowledgement: 1217683Spst * ``This product includes software developed by the University of California, 1317683Spst * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 1417683Spst * the University nor the names of its contributors may be used to endorse 1517683Spst * or promote products derived from this software without specific prior 1617683Spst * written permission. 1717683Spst * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 1817683Spst * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 1917683Spst * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 20162020Ssam * 21162020Ssam * $FreeBSD: head/contrib/libpcap/pcap-bpf.c 235426 2012-05-14 05:12:56Z delphij $ 2217683Spst */ 2317683Spst#ifndef lint 24127664Sbmsstatic const char rcsid[] _U_ = 25214518Srpaulo "@(#) $Header: /tcpdump/master/libpcap/pcap-bpf.c,v 1.116 2008-09-16 18:42:29 guy Exp $ (LBL)"; 2617683Spst#endif 2717683Spst 2875107Sfenner#ifdef HAVE_CONFIG_H 2975107Sfenner#include "config.h" 3075107Sfenner#endif 3175107Sfenner 3217683Spst#include <sys/param.h> /* optionally get BSD define */ 33190225Srpaulo#ifdef HAVE_ZEROCOPY_BPF 34183102Scsjp#include <sys/mman.h> 35190225Srpaulo#endif 3617683Spst#include <sys/socket.h> 37235426Sdelphij#include <time.h> 38214518Srpaulo/* 39214518Srpaulo * <net/bpf.h> defines ioctls, but doesn't include <sys/ioccom.h>. 40214518Srpaulo * 41214518Srpaulo * We include <sys/ioctl.h> as it might be necessary to declare ioctl(); 42214518Srpaulo * at least on *BSD and Mac OS X, it also defines various SIOC ioctls - 43214518Srpaulo * we could include <sys/sockio.h>, but if we're already including 44214518Srpaulo * <sys/ioctl.h>, which includes <sys/sockio.h> on those platforms, 45214518Srpaulo * there's not much point in doing so. 46214518Srpaulo * 47214518Srpaulo * If we have <sys/ioccom.h>, we include it as well, to handle systems 48214518Srpaulo * such as Solaris which don't arrange to include <sys/ioccom.h> if you 49214518Srpaulo * include <sys/ioctl.h> 50214518Srpaulo */ 5117683Spst#include <sys/ioctl.h> 52214518Srpaulo#ifdef HAVE_SYS_IOCCOM_H 53214518Srpaulo#include <sys/ioccom.h> 54214518Srpaulo#endif 55127664Sbms#include <sys/utsname.h> 5617683Spst 57190225Srpaulo#ifdef HAVE_ZEROCOPY_BPF 58190225Srpaulo#include <machine/atomic.h> 59190225Srpaulo#endif 60190225Srpaulo 6117683Spst#include <net/if.h> 62127664Sbms 6398530Sfenner#ifdef _AIX 64127664Sbms 6598530Sfenner/* 66190225Srpaulo * Make "pcap.h" not include "pcap/bpf.h"; we are going to include the 67127664Sbms * native OS version, as we need "struct bpf_config" from it. 6898530Sfenner */ 69127664Sbms#define PCAP_DONT_INCLUDE_PCAP_BPF_H 70127664Sbms 71127664Sbms#include <sys/types.h> 72127664Sbms 73127664Sbms/* 74127664Sbms * Prevent bpf.h from redefining the DLT_ values to their 75127664Sbms * IFT_ values, as we're going to return the standard libpcap 76127664Sbms * values, not IBM's non-standard IFT_ values. 77127664Sbms */ 78127664Sbms#undef _AIX 79127664Sbms#include <net/bpf.h> 80127664Sbms#define _AIX 81127664Sbms 8298530Sfenner#include <net/if_types.h> /* for IFT_ values */ 83127664Sbms#include <sys/sysconfig.h> 84127664Sbms#include <sys/device.h> 85147894Ssam#include <sys/cfgodm.h> 86127664Sbms#include <cf.h> 8717683Spst 88127664Sbms#ifdef __64BIT__ 89127664Sbms#define domakedev makedev64 90127664Sbms#define getmajor major64 91127664Sbms#define bpf_hdr bpf_hdr32 92127664Sbms#else /* __64BIT__ */ 93127664Sbms#define domakedev makedev 94127664Sbms#define getmajor major 95127664Sbms#endif /* __64BIT__ */ 96127664Sbms 97127664Sbms#define BPF_NAME "bpf" 98127664Sbms#define BPF_MINORS 4 99127664Sbms#define DRIVER_PATH "/usr/lib/drivers" 100127664Sbms#define BPF_NODE "/dev/bpf" 101127664Sbmsstatic int bpfloadedflag = 0; 102127664Sbmsstatic int odmlockid = 0; 103127664Sbms 104214518Srpaulostatic int bpf_load(char *errbuf); 105214518Srpaulo 106127664Sbms#else /* _AIX */ 107127664Sbms 108127664Sbms#include <net/bpf.h> 109127664Sbms 110127664Sbms#endif /* _AIX */ 111127664Sbms 11217683Spst#include <ctype.h> 113214518Srpaulo#include <fcntl.h> 11417683Spst#include <errno.h> 11517683Spst#include <netdb.h> 11617683Spst#include <stdio.h> 11717683Spst#include <stdlib.h> 11817683Spst#include <string.h> 11917683Spst#include <unistd.h> 12017683Spst 121190225Srpaulo#ifdef HAVE_NET_IF_MEDIA_H 122190225Srpaulo# include <net/if_media.h> 123190225Srpaulo#endif 124190225Srpaulo 12517683Spst#include "pcap-int.h" 12617683Spst 127127664Sbms#ifdef HAVE_DAG_API 128127664Sbms#include "pcap-dag.h" 129127664Sbms#endif /* HAVE_DAG_API */ 130127664Sbms 131214518Srpaulo#ifdef HAVE_SNF_API 132214518Srpaulo#include "pcap-snf.h" 133214518Srpaulo#endif /* HAVE_SNF_API */ 134214518Srpaulo 13517683Spst#ifdef HAVE_OS_PROTO_H 13617683Spst#include "os-proto.h" 13717683Spst#endif 13817683Spst 139190225Srpaulo#ifdef BIOCGDLTLIST 140190225Srpaulo# if (defined(HAVE_NET_IF_MEDIA_H) && defined(IFM_IEEE80211)) && !defined(__APPLE__) 141190225Srpaulo#define HAVE_BSD_IEEE80211 142190225Srpaulo# endif 14356889Sfenner 144190225Srpaulo# if defined(__APPLE__) || defined(HAVE_BSD_IEEE80211) 145190225Srpaulostatic int find_802_11(struct bpf_dltlist *); 146190225Srpaulo 147190225Srpaulo# ifdef HAVE_BSD_IEEE80211 148190225Srpaulostatic int monitor_mode(pcap_t *, int); 149190225Srpaulo# endif 150190225Srpaulo 151190225Srpaulo# if defined(__APPLE__) 152190225Srpaulostatic void remove_en(pcap_t *); 153190225Srpaulostatic void remove_802_11(pcap_t *); 154190225Srpaulo# endif 155190225Srpaulo 156190225Srpaulo# endif /* defined(__APPLE__) || defined(HAVE_BSD_IEEE80211) */ 157190225Srpaulo 158190225Srpaulo#endif /* BIOCGDLTLIST */ 159190225Srpaulo 160190225Srpaulo/* 161190225Srpaulo * We include the OS's <net/bpf.h>, not our "pcap/bpf.h", so we probably 162190225Srpaulo * don't get DLT_DOCSIS defined. 163190225Srpaulo */ 164190225Srpaulo#ifndef DLT_DOCSIS 165190225Srpaulo#define DLT_DOCSIS 143 166190225Srpaulo#endif 167190225Srpaulo 168190225Srpaulo/* 169190225Srpaulo * On OS X, we don't even get any of the 802.11-plus-radio-header DLT_'s 170190225Srpaulo * defined, even though some of them are used by various Airport drivers. 171190225Srpaulo */ 172190225Srpaulo#ifndef DLT_PRISM_HEADER 173190225Srpaulo#define DLT_PRISM_HEADER 119 174190225Srpaulo#endif 175190225Srpaulo#ifndef DLT_AIRONET_HEADER 176190225Srpaulo#define DLT_AIRONET_HEADER 120 177190225Srpaulo#endif 178190225Srpaulo#ifndef DLT_IEEE802_11_RADIO 179190225Srpaulo#define DLT_IEEE802_11_RADIO 127 180190225Srpaulo#endif 181190225Srpaulo#ifndef DLT_IEEE802_11_RADIO_AVS 182190225Srpaulo#define DLT_IEEE802_11_RADIO_AVS 163 183190225Srpaulo#endif 184190225Srpaulo 185190225Srpaulostatic int pcap_can_set_rfmon_bpf(pcap_t *p); 186190225Srpaulostatic int pcap_activate_bpf(pcap_t *p); 187127664Sbmsstatic int pcap_setfilter_bpf(pcap_t *p, struct bpf_program *fp); 188162012Ssamstatic int pcap_setdirection_bpf(pcap_t *, pcap_direction_t); 189127664Sbmsstatic int pcap_set_datalink_bpf(pcap_t *p, int dlt); 190127664Sbms 191190225Srpaulo/* 192235426Sdelphij * For zerocopy bpf, the setnonblock/getnonblock routines need to modify 193235426Sdelphij * p->md.timeout so we don't call select(2) if the pcap handle is in non- 194235426Sdelphij * blocking mode. We preserve the timeout supplied by pcap_open functions 195235426Sdelphij * to make sure it does not get clobbered if the pcap handle moves between 196235426Sdelphij * blocking and non-blocking mode. 197190225Srpaulo */ 198127664Sbmsstatic int 199235426Sdelphijpcap_getnonblock_bpf(pcap_t *p, char *errbuf) 200190225Srpaulo{ 201235426Sdelphij#ifdef HAVE_ZEROCOPY_BPF 202235426Sdelphij if (p->md.zerocopy) { 203235426Sdelphij /* 204235426Sdelphij * Use a negative value for the timeout to represent that the 205235426Sdelphij * pcap handle is in non-blocking mode. 206235426Sdelphij */ 207235426Sdelphij return (p->md.timeout < 0); 208235426Sdelphij } 209235426Sdelphij#endif 210235426Sdelphij return (pcap_getnonblock_fd(p, errbuf)); 211190225Srpaulo} 212190225Srpaulo 213190225Srpaulostatic int 214235426Sdelphijpcap_setnonblock_bpf(pcap_t *p, int nonblock, char *errbuf) 215190225Srpaulo{ 216235426Sdelphij#ifdef HAVE_ZEROCOPY_BPF 217235426Sdelphij if (p->md.zerocopy) { 218235426Sdelphij /* 219235426Sdelphij * Map each value to the corresponding 2's complement, to 220235426Sdelphij * preserve the timeout value provided with pcap_set_timeout. 221235426Sdelphij * (from pcap-linux.c). 222235426Sdelphij */ 223235426Sdelphij if (nonblock) { 224235426Sdelphij if (p->md.timeout >= 0) { 225235426Sdelphij /* 226235426Sdelphij * Timeout is non-negative, so we're not 227235426Sdelphij * currently in non-blocking mode; set it 228235426Sdelphij * to the 2's complement, to make it 229235426Sdelphij * negative, as an indication that we're 230235426Sdelphij * in non-blocking mode. 231235426Sdelphij */ 232235426Sdelphij p->md.timeout = p->md.timeout * -1 - 1; 233235426Sdelphij } 234235426Sdelphij } else { 235235426Sdelphij if (p->md.timeout < 0) { 236235426Sdelphij /* 237235426Sdelphij * Timeout is negative, so we're currently 238235426Sdelphij * in blocking mode; reverse the previous 239235426Sdelphij * operation, to make the timeout non-negative 240235426Sdelphij * again. 241235426Sdelphij */ 242235426Sdelphij p->md.timeout = (p->md.timeout + 1) * -1; 243235426Sdelphij } 244214518Srpaulo } 245235426Sdelphij return (0); 246214518Srpaulo } 247235426Sdelphij#endif 248235426Sdelphij return (pcap_setnonblock_fd(p, nonblock, errbuf)); 249190225Srpaulo} 250190225Srpaulo 251235426Sdelphij#ifdef HAVE_ZEROCOPY_BPF 252190225Srpaulo/* 253190225Srpaulo * Zero-copy BPF buffer routines to check for and acknowledge BPF data in 254190225Srpaulo * shared memory buffers. 255190225Srpaulo * 256190225Srpaulo * pcap_next_zbuf_shm(): Check for a newly available shared memory buffer, 257190225Srpaulo * and set up p->buffer and cc to reflect one if available. Notice that if 258190225Srpaulo * there was no prior buffer, we select zbuf1 as this will be the first 259190225Srpaulo * buffer filled for a fresh BPF session. 260190225Srpaulo */ 261190225Srpaulostatic int 262190225Srpaulopcap_next_zbuf_shm(pcap_t *p, int *cc) 263190225Srpaulo{ 264190225Srpaulo struct bpf_zbuf_header *bzh; 265190225Srpaulo 266190225Srpaulo if (p->md.zbuffer == p->md.zbuf2 || p->md.zbuffer == NULL) { 267190225Srpaulo bzh = (struct bpf_zbuf_header *)p->md.zbuf1; 268190225Srpaulo if (bzh->bzh_user_gen != 269190225Srpaulo atomic_load_acq_int(&bzh->bzh_kernel_gen)) { 270190225Srpaulo p->md.bzh = bzh; 271190225Srpaulo p->md.zbuffer = (u_char *)p->md.zbuf1; 272190225Srpaulo p->buffer = p->md.zbuffer + sizeof(*bzh); 273190225Srpaulo *cc = bzh->bzh_kernel_len; 274190225Srpaulo return (1); 275190225Srpaulo } 276190225Srpaulo } else if (p->md.zbuffer == p->md.zbuf1) { 277190225Srpaulo bzh = (struct bpf_zbuf_header *)p->md.zbuf2; 278190225Srpaulo if (bzh->bzh_user_gen != 279190225Srpaulo atomic_load_acq_int(&bzh->bzh_kernel_gen)) { 280190225Srpaulo p->md.bzh = bzh; 281190225Srpaulo p->md.zbuffer = (u_char *)p->md.zbuf2; 282190225Srpaulo p->buffer = p->md.zbuffer + sizeof(*bzh); 283190225Srpaulo *cc = bzh->bzh_kernel_len; 284190225Srpaulo return (1); 285190225Srpaulo } 286190225Srpaulo } 287190225Srpaulo *cc = 0; 288190225Srpaulo return (0); 289190225Srpaulo} 290190225Srpaulo 291190225Srpaulo/* 292190225Srpaulo * pcap_next_zbuf() -- Similar to pcap_next_zbuf_shm(), except wait using 293190225Srpaulo * select() for data or a timeout, and possibly force rotation of the buffer 294190225Srpaulo * in the event we time out or are in immediate mode. Invoke the shared 295190225Srpaulo * memory check before doing system calls in order to avoid doing avoidable 296190225Srpaulo * work. 297190225Srpaulo */ 298190225Srpaulostatic int 299190225Srpaulopcap_next_zbuf(pcap_t *p, int *cc) 300190225Srpaulo{ 301190225Srpaulo struct bpf_zbuf bz; 302190225Srpaulo struct timeval tv; 303190225Srpaulo struct timespec cur; 304190225Srpaulo fd_set r_set; 305190225Srpaulo int data, r; 306190225Srpaulo int expire, tmout; 307190225Srpaulo 308190225Srpaulo#define TSTOMILLI(ts) (((ts)->tv_sec * 1000) + ((ts)->tv_nsec / 1000000)) 309190225Srpaulo /* 310190225Srpaulo * Start out by seeing whether anything is waiting by checking the 311190225Srpaulo * next shared memory buffer for data. 312190225Srpaulo */ 313190225Srpaulo data = pcap_next_zbuf_shm(p, cc); 314190225Srpaulo if (data) 315190225Srpaulo return (data); 316190225Srpaulo /* 317190225Srpaulo * If a previous sleep was interrupted due to signal delivery, make 318190225Srpaulo * sure that the timeout gets adjusted accordingly. This requires 319190225Srpaulo * that we analyze when the timeout should be been expired, and 320190225Srpaulo * subtract the current time from that. If after this operation, 321190225Srpaulo * our timeout is less then or equal to zero, handle it like a 322190225Srpaulo * regular timeout. 323190225Srpaulo */ 324190225Srpaulo tmout = p->md.timeout; 325190225Srpaulo if (tmout) 326190225Srpaulo (void) clock_gettime(CLOCK_MONOTONIC, &cur); 327190225Srpaulo if (p->md.interrupted && p->md.timeout) { 328190225Srpaulo expire = TSTOMILLI(&p->md.firstsel) + p->md.timeout; 329190225Srpaulo tmout = expire - TSTOMILLI(&cur); 330190225Srpaulo#undef TSTOMILLI 331190225Srpaulo if (tmout <= 0) { 332190225Srpaulo p->md.interrupted = 0; 333190225Srpaulo data = pcap_next_zbuf_shm(p, cc); 334190225Srpaulo if (data) 335190225Srpaulo return (data); 336190225Srpaulo if (ioctl(p->fd, BIOCROTZBUF, &bz) < 0) { 337190225Srpaulo (void) snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 338190225Srpaulo "BIOCROTZBUF: %s", strerror(errno)); 339190225Srpaulo return (PCAP_ERROR); 340190225Srpaulo } 341190225Srpaulo return (pcap_next_zbuf_shm(p, cc)); 342190225Srpaulo } 343190225Srpaulo } 344190225Srpaulo /* 345190225Srpaulo * No data in the buffer, so must use select() to wait for data or 346190225Srpaulo * the next timeout. Note that we only call select if the handle 347190225Srpaulo * is in blocking mode. 348190225Srpaulo */ 349190225Srpaulo if (p->md.timeout >= 0) { 350190225Srpaulo FD_ZERO(&r_set); 351190225Srpaulo FD_SET(p->fd, &r_set); 352190225Srpaulo if (tmout != 0) { 353190225Srpaulo tv.tv_sec = tmout / 1000; 354190225Srpaulo tv.tv_usec = (tmout * 1000) % 1000000; 355190225Srpaulo } 356190225Srpaulo r = select(p->fd + 1, &r_set, NULL, NULL, 357190225Srpaulo p->md.timeout != 0 ? &tv : NULL); 358190225Srpaulo if (r < 0 && errno == EINTR) { 359190225Srpaulo if (!p->md.interrupted && p->md.timeout) { 360190225Srpaulo p->md.interrupted = 1; 361190225Srpaulo p->md.firstsel = cur; 362190225Srpaulo } 363190225Srpaulo return (0); 364190225Srpaulo } else if (r < 0) { 365190225Srpaulo (void) snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 366190225Srpaulo "select: %s", strerror(errno)); 367190225Srpaulo return (PCAP_ERROR); 368190225Srpaulo } 369190225Srpaulo } 370190225Srpaulo p->md.interrupted = 0; 371190225Srpaulo /* 372190225Srpaulo * Check again for data, which may exist now that we've either been 373190225Srpaulo * woken up as a result of data or timed out. Try the "there's data" 374190225Srpaulo * case first since it doesn't require a system call. 375190225Srpaulo */ 376190225Srpaulo data = pcap_next_zbuf_shm(p, cc); 377190225Srpaulo if (data) 378190225Srpaulo return (data); 379190225Srpaulo /* 380190225Srpaulo * Try forcing a buffer rotation to dislodge timed out or immediate 381190225Srpaulo * data. 382190225Srpaulo */ 383190225Srpaulo if (ioctl(p->fd, BIOCROTZBUF, &bz) < 0) { 384190225Srpaulo (void) snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 385190225Srpaulo "BIOCROTZBUF: %s", strerror(errno)); 386190225Srpaulo return (PCAP_ERROR); 387190225Srpaulo } 388190225Srpaulo return (pcap_next_zbuf_shm(p, cc)); 389190225Srpaulo} 390190225Srpaulo 391190225Srpaulo/* 392190225Srpaulo * Notify kernel that we are done with the buffer. We don't reset zbuffer so 393190225Srpaulo * that we know which buffer to use next time around. 394190225Srpaulo */ 395190225Srpaulostatic int 396190225Srpaulopcap_ack_zbuf(pcap_t *p) 397190225Srpaulo{ 398190225Srpaulo 399190225Srpaulo atomic_store_rel_int(&p->md.bzh->bzh_user_gen, 400190225Srpaulo p->md.bzh->bzh_kernel_gen); 401190225Srpaulo p->md.bzh = NULL; 402190225Srpaulo p->buffer = NULL; 403190225Srpaulo return (0); 404190225Srpaulo} 405235426Sdelphij#endif /* HAVE_ZEROCOPY_BPF */ 406190225Srpaulo 407190225Srpaulopcap_t * 408190225Srpaulopcap_create(const char *device, char *ebuf) 409190225Srpaulo{ 410190225Srpaulo pcap_t *p; 411190225Srpaulo 412190225Srpaulo#ifdef HAVE_DAG_API 413190225Srpaulo if (strstr(device, "dag")) 414190225Srpaulo return (dag_create(device, ebuf)); 415190225Srpaulo#endif /* HAVE_DAG_API */ 416214518Srpaulo#ifdef HAVE_SNF_API 417214518Srpaulo if (strstr(device, "snf")) 418214518Srpaulo return (snf_create(device, ebuf)); 419214518Srpaulo#endif /* HAVE_SNF_API */ 420190225Srpaulo 421190225Srpaulo p = pcap_create_common(device, ebuf); 422190225Srpaulo if (p == NULL) 423190225Srpaulo return (NULL); 424190225Srpaulo 425190225Srpaulo p->activate_op = pcap_activate_bpf; 426190225Srpaulo p->can_set_rfmon_op = pcap_can_set_rfmon_bpf; 427190225Srpaulo return (p); 428190225Srpaulo} 429190225Srpaulo 430235426Sdelphij/* 431235426Sdelphij * On success, returns a file descriptor for a BPF device. 432235426Sdelphij * On failure, returns a PCAP_ERROR_ value, and sets p->errbuf. 433235426Sdelphij */ 434190225Srpaulostatic int 435190225Srpaulobpf_open(pcap_t *p) 436190225Srpaulo{ 437190225Srpaulo int fd; 438190225Srpaulo#ifdef HAVE_CLONING_BPF 439190225Srpaulo static const char device[] = "/dev/bpf"; 440190225Srpaulo#else 441190225Srpaulo int n = 0; 442190225Srpaulo char device[sizeof "/dev/bpf0000000000"]; 443190225Srpaulo#endif 444190225Srpaulo 445190225Srpaulo#ifdef _AIX 446190225Srpaulo /* 447190225Srpaulo * Load the bpf driver, if it isn't already loaded, 448190225Srpaulo * and create the BPF device entries, if they don't 449190225Srpaulo * already exist. 450190225Srpaulo */ 451190225Srpaulo if (bpf_load(p->errbuf) == PCAP_ERROR) 452190225Srpaulo return (PCAP_ERROR); 453190225Srpaulo#endif 454190225Srpaulo 455190225Srpaulo#ifdef HAVE_CLONING_BPF 456190225Srpaulo if ((fd = open(device, O_RDWR)) == -1 && 457190225Srpaulo (errno != EACCES || (fd = open(device, O_RDONLY)) == -1)) { 458190225Srpaulo if (errno == EACCES) 459190225Srpaulo fd = PCAP_ERROR_PERM_DENIED; 460190225Srpaulo else 461190225Srpaulo fd = PCAP_ERROR; 462190225Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 463190225Srpaulo "(cannot open device) %s: %s", device, pcap_strerror(errno)); 464190225Srpaulo } 465190225Srpaulo#else 466190225Srpaulo /* 467190225Srpaulo * Go through all the minors and find one that isn't in use. 468190225Srpaulo */ 469190225Srpaulo do { 470190225Srpaulo (void)snprintf(device, sizeof(device), "/dev/bpf%d", n++); 471190225Srpaulo /* 472190225Srpaulo * Initially try a read/write open (to allow the inject 473190225Srpaulo * method to work). If that fails due to permission 474190225Srpaulo * issues, fall back to read-only. This allows a 475190225Srpaulo * non-root user to be granted specific access to pcap 476190225Srpaulo * capabilities via file permissions. 477190225Srpaulo * 478190225Srpaulo * XXX - we should have an API that has a flag that 479190225Srpaulo * controls whether to open read-only or read-write, 480190225Srpaulo * so that denial of permission to send (or inability 481190225Srpaulo * to send, if sending packets isn't supported on 482190225Srpaulo * the device in question) can be indicated at open 483190225Srpaulo * time. 484190225Srpaulo */ 485190225Srpaulo fd = open(device, O_RDWR); 486190225Srpaulo if (fd == -1 && errno == EACCES) 487190225Srpaulo fd = open(device, O_RDONLY); 488190225Srpaulo } while (fd < 0 && errno == EBUSY); 489190225Srpaulo 490190225Srpaulo /* 491190225Srpaulo * XXX better message for all minors used 492190225Srpaulo */ 493190225Srpaulo if (fd < 0) { 494235426Sdelphij switch (errno) { 495235426Sdelphij 496235426Sdelphij case ENOENT: 497235426Sdelphij fd = PCAP_ERROR; 498235426Sdelphij if (n == 1) { 499235426Sdelphij /* 500235426Sdelphij * /dev/bpf0 doesn't exist, which 501235426Sdelphij * means we probably have no BPF 502235426Sdelphij * devices. 503235426Sdelphij */ 504235426Sdelphij snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 505235426Sdelphij "(there are no BPF devices)"); 506235426Sdelphij } else { 507235426Sdelphij /* 508235426Sdelphij * We got EBUSY on at least one 509235426Sdelphij * BPF device, so we have BPF 510235426Sdelphij * devices, but all the ones 511235426Sdelphij * that exist are busy. 512235426Sdelphij */ 513235426Sdelphij snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 514235426Sdelphij "(all BPF devices are busy)"); 515235426Sdelphij } 516235426Sdelphij break; 517235426Sdelphij 518235426Sdelphij case EACCES: 519235426Sdelphij /* 520235426Sdelphij * Got EACCES on the last device we tried, 521235426Sdelphij * and EBUSY on all devices before that, 522235426Sdelphij * if any. 523235426Sdelphij */ 524190225Srpaulo fd = PCAP_ERROR_PERM_DENIED; 525235426Sdelphij snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 526235426Sdelphij "(cannot open BPF device) %s: %s", device, 527235426Sdelphij pcap_strerror(errno)); 528235426Sdelphij break; 529235426Sdelphij 530235426Sdelphij default: 531235426Sdelphij /* 532235426Sdelphij * Some other problem. 533235426Sdelphij */ 534190225Srpaulo fd = PCAP_ERROR; 535235426Sdelphij snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 536235426Sdelphij "(cannot open BPF device) %s: %s", device, 537235426Sdelphij pcap_strerror(errno)); 538235426Sdelphij break; 539235426Sdelphij } 540190225Srpaulo } 541190225Srpaulo#endif 542190225Srpaulo 543190225Srpaulo return (fd); 544190225Srpaulo} 545190225Srpaulo 546190225Srpaulo#ifdef BIOCGDLTLIST 547190225Srpaulostatic int 548190225Srpauloget_dlt_list(int fd, int v, struct bpf_dltlist *bdlp, char *ebuf) 549190225Srpaulo{ 550190225Srpaulo memset(bdlp, 0, sizeof(*bdlp)); 551190225Srpaulo if (ioctl(fd, BIOCGDLTLIST, (caddr_t)bdlp) == 0) { 552190225Srpaulo u_int i; 553190225Srpaulo int is_ethernet; 554190225Srpaulo 555190225Srpaulo bdlp->bfl_list = (u_int *) malloc(sizeof(u_int) * (bdlp->bfl_len + 1)); 556190225Srpaulo if (bdlp->bfl_list == NULL) { 557190225Srpaulo (void)snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", 558190225Srpaulo pcap_strerror(errno)); 559190225Srpaulo return (PCAP_ERROR); 560190225Srpaulo } 561190225Srpaulo 562190225Srpaulo if (ioctl(fd, BIOCGDLTLIST, (caddr_t)bdlp) < 0) { 563190225Srpaulo (void)snprintf(ebuf, PCAP_ERRBUF_SIZE, 564190225Srpaulo "BIOCGDLTLIST: %s", pcap_strerror(errno)); 565190225Srpaulo free(bdlp->bfl_list); 566190225Srpaulo return (PCAP_ERROR); 567190225Srpaulo } 568190225Srpaulo 569190225Srpaulo /* 570190225Srpaulo * OK, for real Ethernet devices, add DLT_DOCSIS to the 571190225Srpaulo * list, so that an application can let you choose it, 572190225Srpaulo * in case you're capturing DOCSIS traffic that a Cisco 573190225Srpaulo * Cable Modem Termination System is putting out onto 574190225Srpaulo * an Ethernet (it doesn't put an Ethernet header onto 575190225Srpaulo * the wire, it puts raw DOCSIS frames out on the wire 576190225Srpaulo * inside the low-level Ethernet framing). 577190225Srpaulo * 578190225Srpaulo * A "real Ethernet device" is defined here as a device 579190225Srpaulo * that has a link-layer type of DLT_EN10MB and that has 580190225Srpaulo * no alternate link-layer types; that's done to exclude 581190225Srpaulo * 802.11 interfaces (which might or might not be the 582190225Srpaulo * right thing to do, but I suspect it is - Ethernet <-> 583190225Srpaulo * 802.11 bridges would probably badly mishandle frames 584190225Srpaulo * that don't have Ethernet headers). 585214518Srpaulo * 586214518Srpaulo * On Solaris with BPF, Ethernet devices also offer 587214518Srpaulo * DLT_IPNET, so we, if DLT_IPNET is defined, we don't 588214518Srpaulo * treat it as an indication that the device isn't an 589214518Srpaulo * Ethernet. 590190225Srpaulo */ 591190225Srpaulo if (v == DLT_EN10MB) { 592190225Srpaulo is_ethernet = 1; 593190225Srpaulo for (i = 0; i < bdlp->bfl_len; i++) { 594214518Srpaulo if (bdlp->bfl_list[i] != DLT_EN10MB 595214518Srpaulo#ifdef DLT_IPNET 596214518Srpaulo && bdlp->bfl_list[i] != DLT_IPNET 597214518Srpaulo#endif 598214518Srpaulo ) { 599190225Srpaulo is_ethernet = 0; 600190225Srpaulo break; 601190225Srpaulo } 602190225Srpaulo } 603190225Srpaulo if (is_ethernet) { 604190225Srpaulo /* 605190225Srpaulo * We reserved one more slot at the end of 606190225Srpaulo * the list. 607190225Srpaulo */ 608190225Srpaulo bdlp->bfl_list[bdlp->bfl_len] = DLT_DOCSIS; 609190225Srpaulo bdlp->bfl_len++; 610190225Srpaulo } 611190225Srpaulo } 612190225Srpaulo } else { 613190225Srpaulo /* 614190225Srpaulo * EINVAL just means "we don't support this ioctl on 615190225Srpaulo * this device"; don't treat it as an error. 616190225Srpaulo */ 617190225Srpaulo if (errno != EINVAL) { 618190225Srpaulo (void)snprintf(ebuf, PCAP_ERRBUF_SIZE, 619190225Srpaulo "BIOCGDLTLIST: %s", pcap_strerror(errno)); 620190225Srpaulo return (PCAP_ERROR); 621190225Srpaulo } 622190225Srpaulo } 623190225Srpaulo return (0); 624190225Srpaulo} 625190225Srpaulo#endif 626190225Srpaulo 627190225Srpaulostatic int 628190225Srpaulopcap_can_set_rfmon_bpf(pcap_t *p) 629190225Srpaulo{ 630190225Srpaulo#if defined(__APPLE__) 631190225Srpaulo struct utsname osinfo; 632190225Srpaulo struct ifreq ifr; 633190225Srpaulo int fd; 634190225Srpaulo#ifdef BIOCGDLTLIST 635190225Srpaulo struct bpf_dltlist bdl; 636190225Srpaulo#endif 637190225Srpaulo 638190225Srpaulo /* 639190225Srpaulo * The joys of monitor mode on OS X. 640190225Srpaulo * 641190225Srpaulo * Prior to 10.4, it's not supported at all. 642190225Srpaulo * 643190225Srpaulo * In 10.4, if adapter enN supports monitor mode, there's a 644190225Srpaulo * wltN adapter corresponding to it; you open it, instead of 645190225Srpaulo * enN, to get monitor mode. You get whatever link-layer 646190225Srpaulo * headers it supplies. 647190225Srpaulo * 648190225Srpaulo * In 10.5, and, we assume, later releases, if adapter enN 649190225Srpaulo * supports monitor mode, it offers, among its selectable 650190225Srpaulo * DLT_ values, values that let you get the 802.11 header; 651190225Srpaulo * selecting one of those values puts the adapter into monitor 652190225Srpaulo * mode (i.e., you can't get 802.11 headers except in monitor 653190225Srpaulo * mode, and you can't get Ethernet headers in monitor mode). 654190225Srpaulo */ 655190225Srpaulo if (uname(&osinfo) == -1) { 656190225Srpaulo /* 657190225Srpaulo * Can't get the OS version; just say "no". 658190225Srpaulo */ 659190225Srpaulo return (0); 660190225Srpaulo } 661190225Srpaulo /* 662190225Srpaulo * We assume osinfo.sysname is "Darwin", because 663190225Srpaulo * __APPLE__ is defined. We just check the version. 664190225Srpaulo */ 665190225Srpaulo if (osinfo.release[0] < '8' && osinfo.release[1] == '.') { 666190225Srpaulo /* 667190225Srpaulo * 10.3 (Darwin 7.x) or earlier. 668190225Srpaulo * Monitor mode not supported. 669190225Srpaulo */ 670190225Srpaulo return (0); 671190225Srpaulo } 672190225Srpaulo if (osinfo.release[0] == '8' && osinfo.release[1] == '.') { 673190225Srpaulo /* 674190225Srpaulo * 10.4 (Darwin 8.x). s/en/wlt/, and check 675190225Srpaulo * whether the device exists. 676190225Srpaulo */ 677190225Srpaulo if (strncmp(p->opt.source, "en", 2) != 0) { 678190225Srpaulo /* 679190225Srpaulo * Not an enN device; no monitor mode. 680190225Srpaulo */ 681190225Srpaulo return (0); 682190225Srpaulo } 683190225Srpaulo fd = socket(AF_INET, SOCK_DGRAM, 0); 684190225Srpaulo if (fd == -1) { 685190225Srpaulo (void)snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 686190225Srpaulo "socket: %s", pcap_strerror(errno)); 687190225Srpaulo return (PCAP_ERROR); 688190225Srpaulo } 689190225Srpaulo strlcpy(ifr.ifr_name, "wlt", sizeof(ifr.ifr_name)); 690190225Srpaulo strlcat(ifr.ifr_name, p->opt.source + 2, sizeof(ifr.ifr_name)); 691190225Srpaulo if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) { 692190225Srpaulo /* 693190225Srpaulo * No such device? 694190225Srpaulo */ 695190225Srpaulo close(fd); 696190225Srpaulo return (0); 697190225Srpaulo } 698190225Srpaulo close(fd); 699190225Srpaulo return (1); 700190225Srpaulo } 701190225Srpaulo 702190225Srpaulo#ifdef BIOCGDLTLIST 703190225Srpaulo /* 704190225Srpaulo * Everything else is 10.5 or later; for those, 705190225Srpaulo * we just open the enN device, and check whether 706190225Srpaulo * we have any 802.11 devices. 707190225Srpaulo * 708190225Srpaulo * First, open a BPF device. 709190225Srpaulo */ 710190225Srpaulo fd = bpf_open(p); 711190225Srpaulo if (fd < 0) 712235426Sdelphij return (fd); /* fd is the appropriate error code */ 713190225Srpaulo 714190225Srpaulo /* 715190225Srpaulo * Now bind to the device. 716190225Srpaulo */ 717190225Srpaulo (void)strncpy(ifr.ifr_name, p->opt.source, sizeof(ifr.ifr_name)); 718190225Srpaulo if (ioctl(fd, BIOCSETIF, (caddr_t)&ifr) < 0) { 719235426Sdelphij switch (errno) { 720235426Sdelphij 721235426Sdelphij case ENXIO: 722190225Srpaulo /* 723235426Sdelphij * There's no such device. 724235426Sdelphij */ 725235426Sdelphij close(fd); 726235426Sdelphij return (PCAP_ERROR_NO_SUCH_DEVICE); 727235426Sdelphij 728235426Sdelphij case ENETDOWN: 729235426Sdelphij /* 730190225Srpaulo * Return a "network down" indication, so that 731190225Srpaulo * the application can report that rather than 732190225Srpaulo * saying we had a mysterious failure and 733190225Srpaulo * suggest that they report a problem to the 734190225Srpaulo * libpcap developers. 735190225Srpaulo */ 736190225Srpaulo close(fd); 737190225Srpaulo return (PCAP_ERROR_IFACE_NOT_UP); 738235426Sdelphij 739235426Sdelphij default: 740190225Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 741190225Srpaulo "BIOCSETIF: %s: %s", 742190225Srpaulo p->opt.source, pcap_strerror(errno)); 743190225Srpaulo close(fd); 744190225Srpaulo return (PCAP_ERROR); 745190225Srpaulo } 746190225Srpaulo } 747190225Srpaulo 748190225Srpaulo /* 749190225Srpaulo * We know the default link type -- now determine all the DLTs 750190225Srpaulo * this interface supports. If this fails with EINVAL, it's 751190225Srpaulo * not fatal; we just don't get to use the feature later. 752190225Srpaulo * (We don't care about DLT_DOCSIS, so we pass DLT_NULL 753190225Srpaulo * as the default DLT for this adapter.) 754190225Srpaulo */ 755190225Srpaulo if (get_dlt_list(fd, DLT_NULL, &bdl, p->errbuf) == PCAP_ERROR) { 756190225Srpaulo close(fd); 757190225Srpaulo return (PCAP_ERROR); 758190225Srpaulo } 759190225Srpaulo if (find_802_11(&bdl) != -1) { 760190225Srpaulo /* 761190225Srpaulo * We have an 802.11 DLT, so we can set monitor mode. 762190225Srpaulo */ 763190225Srpaulo free(bdl.bfl_list); 764190225Srpaulo close(fd); 765190225Srpaulo return (1); 766190225Srpaulo } 767190225Srpaulo free(bdl.bfl_list); 768190225Srpaulo#endif /* BIOCGDLTLIST */ 769190225Srpaulo return (0); 770190225Srpaulo#elif defined(HAVE_BSD_IEEE80211) 771190225Srpaulo int ret; 772190225Srpaulo 773190225Srpaulo ret = monitor_mode(p, 0); 774190225Srpaulo if (ret == PCAP_ERROR_RFMON_NOTSUP) 775190225Srpaulo return (0); /* not an error, just a "can't do" */ 776190225Srpaulo if (ret == 0) 777190225Srpaulo return (1); /* success */ 778190225Srpaulo return (ret); 779190225Srpaulo#else 780190225Srpaulo return (0); 781190225Srpaulo#endif 782190225Srpaulo} 783190225Srpaulo 784190225Srpaulostatic int 785127664Sbmspcap_stats_bpf(pcap_t *p, struct pcap_stat *ps) 78617683Spst{ 78717683Spst struct bpf_stat s; 78817683Spst 78998530Sfenner /* 79098530Sfenner * "ps_recv" counts packets handed to the filter, not packets 79198530Sfenner * that passed the filter. This includes packets later dropped 79298530Sfenner * because we ran out of buffer space. 79398530Sfenner * 79498530Sfenner * "ps_drop" counts packets dropped inside the BPF device 79598530Sfenner * because we ran out of buffer space. It doesn't count 79698530Sfenner * packets dropped by the interface driver. It counts 79798530Sfenner * only packets that passed the filter. 79898530Sfenner * 79998530Sfenner * Both statistics include packets not yet read from the kernel 80098530Sfenner * by libpcap, and thus not yet seen by the application. 80198530Sfenner */ 80217683Spst if (ioctl(p->fd, BIOCGSTATS, (caddr_t)&s) < 0) { 80375107Sfenner snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCGSTATS: %s", 80475107Sfenner pcap_strerror(errno)); 805190225Srpaulo return (PCAP_ERROR); 80617683Spst } 80717683Spst 80817683Spst ps->ps_recv = s.bs_recv; 80917683Spst ps->ps_drop = s.bs_drop; 810214518Srpaulo ps->ps_ifdrop = 0; 81117683Spst return (0); 81217683Spst} 81317683Spst 814127664Sbmsstatic int 815127664Sbmspcap_read_bpf(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 81617683Spst{ 81717683Spst int cc; 81817683Spst int n = 0; 81917683Spst register u_char *bp, *ep; 820146768Ssam u_char *datap; 821146768Ssam#ifdef PCAP_FDDIPAD 822146768Ssam register int pad; 823146768Ssam#endif 824190225Srpaulo#ifdef HAVE_ZEROCOPY_BPF 825190225Srpaulo int i; 826190225Srpaulo#endif 82717683Spst 82817683Spst again: 829127664Sbms /* 830127664Sbms * Has "pcap_breakloop()" been called? 831127664Sbms */ 832127664Sbms if (p->break_loop) { 833127664Sbms /* 834127664Sbms * Yes - clear the flag that indicates that it 835190225Srpaulo * has, and return PCAP_ERROR_BREAK to indicate 836190225Srpaulo * that we were told to break out of the loop. 837127664Sbms */ 838127664Sbms p->break_loop = 0; 839190225Srpaulo return (PCAP_ERROR_BREAK); 840127664Sbms } 84117683Spst cc = p->cc; 84217683Spst if (p->cc == 0) { 843183102Scsjp /* 844183102Scsjp * When reading without zero-copy from a file descriptor, we 845183102Scsjp * use a single buffer and return a length of data in the 846183102Scsjp * buffer. With zero-copy, we update the p->buffer pointer 847183102Scsjp * to point at whatever underlying buffer contains the next 848183102Scsjp * data and update cc to reflect the data found in the 849183102Scsjp * buffer. 850183102Scsjp */ 851190225Srpaulo#ifdef HAVE_ZEROCOPY_BPF 852190225Srpaulo if (p->md.zerocopy) { 853183102Scsjp if (p->buffer != NULL) 854183102Scsjp pcap_ack_zbuf(p); 855183102Scsjp i = pcap_next_zbuf(p, &cc); 856183102Scsjp if (i == 0) 857183102Scsjp goto again; 858183102Scsjp if (i < 0) 859190225Srpaulo return (PCAP_ERROR); 860183102Scsjp } else 861183102Scsjp#endif 862190225Srpaulo { 863183102Scsjp cc = read(p->fd, (char *)p->buffer, p->bufsize); 864190225Srpaulo } 86517683Spst if (cc < 0) { 86617683Spst /* Don't choke when we get ptraced */ 86717683Spst switch (errno) { 86817683Spst 86917683Spst case EINTR: 87017683Spst goto again; 87117683Spst 872127664Sbms#ifdef _AIX 873127664Sbms case EFAULT: 874127664Sbms /* 875127664Sbms * Sigh. More AIX wonderfulness. 876127664Sbms * 877127664Sbms * For some unknown reason the uiomove() 878127664Sbms * operation in the bpf kernel extension 879190225Srpaulo * used to copy the buffer into user 880127664Sbms * space sometimes returns EFAULT. I have 881127664Sbms * no idea why this is the case given that 882190225Srpaulo * a kernel debugger shows the user buffer 883190225Srpaulo * is correct. This problem appears to 884190225Srpaulo * be mostly mitigated by the memset of 885190225Srpaulo * the buffer before it is first used. 886127664Sbms * Very strange.... Shaun Clowes 887127664Sbms * 888190225Srpaulo * In any case this means that we shouldn't 889127664Sbms * treat EFAULT as a fatal error; as we 890127664Sbms * don't have an API for returning 891127664Sbms * a "some packets were dropped since 892127664Sbms * the last packet you saw" indication, 893127664Sbms * we just ignore EFAULT and keep reading. 894127664Sbms */ 895127664Sbms goto again; 896190225Srpaulo#endif 897190225Srpaulo 89817683Spst case EWOULDBLOCK: 89917683Spst return (0); 900214518Srpaulo 901214518Srpaulo case ENXIO: 902214518Srpaulo /* 903214518Srpaulo * The device on which we're capturing 904214518Srpaulo * went away. 905214518Srpaulo * 906214518Srpaulo * XXX - we should really return 907214518Srpaulo * PCAP_ERROR_IFACE_NOT_UP, but 908214518Srpaulo * pcap_dispatch() etc. aren't 909214518Srpaulo * defined to retur that. 910214518Srpaulo */ 911214518Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 912214518Srpaulo "The interface went down"); 913214518Srpaulo return (PCAP_ERROR); 914214518Srpaulo 915214518Srpaulo#if defined(sun) && !defined(BSD) && !defined(__svr4__) && !defined(__SVR4) 91617683Spst /* 91717683Spst * Due to a SunOS bug, after 2^31 bytes, the kernel 91817683Spst * file offset overflows and read fails with EINVAL. 91917683Spst * The lseek() to 0 will fix things. 92017683Spst */ 92117683Spst case EINVAL: 92217683Spst if (lseek(p->fd, 0L, SEEK_CUR) + 92317683Spst p->bufsize < 0) { 92417683Spst (void)lseek(p->fd, 0L, SEEK_SET); 92517683Spst goto again; 92617683Spst } 92717683Spst /* fall through */ 92817683Spst#endif 92917683Spst } 93075107Sfenner snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read: %s", 93175107Sfenner pcap_strerror(errno)); 932190225Srpaulo return (PCAP_ERROR); 93317683Spst } 93417683Spst bp = p->buffer; 93517683Spst } else 93617683Spst bp = p->bp; 93717683Spst 93817683Spst /* 93917683Spst * Loop through each packet. 94017683Spst */ 94117683Spst#define bhp ((struct bpf_hdr *)bp) 94217683Spst ep = bp + cc; 943146768Ssam#ifdef PCAP_FDDIPAD 944146768Ssam pad = p->fddipad; 945146768Ssam#endif 94617683Spst while (bp < ep) { 94717683Spst register int caplen, hdrlen; 948127664Sbms 949127664Sbms /* 950127664Sbms * Has "pcap_breakloop()" been called? 951127664Sbms * If so, return immediately - if we haven't read any 952190225Srpaulo * packets, clear the flag and return PCAP_ERROR_BREAK 953190225Srpaulo * to indicate that we were told to break out of the loop, 954190225Srpaulo * otherwise leave the flag set, so that the *next* call 955190225Srpaulo * will break out of the loop without having read any 956190225Srpaulo * packets, and return the number of packets we've 957190225Srpaulo * processed so far. 958127664Sbms */ 959127664Sbms if (p->break_loop) { 960235426Sdelphij p->bp = bp; 961235426Sdelphij p->cc = ep - bp; 962235426Sdelphij /* 963235426Sdelphij * ep is set based on the return value of read(), 964235426Sdelphij * but read() from a BPF device doesn't necessarily 965235426Sdelphij * return a value that's a multiple of the alignment 966235426Sdelphij * value for BPF_WORDALIGN(). However, whenever we 967235426Sdelphij * increment bp, we round up the increment value by 968235426Sdelphij * a value rounded up by BPF_WORDALIGN(), so we 969235426Sdelphij * could increment bp past ep after processing the 970235426Sdelphij * last packet in the buffer. 971235426Sdelphij * 972235426Sdelphij * We treat ep < bp as an indication that this 973235426Sdelphij * happened, and just set p->cc to 0. 974235426Sdelphij */ 975235426Sdelphij if (p->cc < 0) 976235426Sdelphij p->cc = 0; 977127664Sbms if (n == 0) { 978127664Sbms p->break_loop = 0; 979190225Srpaulo return (PCAP_ERROR_BREAK); 980235426Sdelphij } else 981127664Sbms return (n); 982127664Sbms } 983127664Sbms 98417683Spst caplen = bhp->bh_caplen; 98517683Spst hdrlen = bhp->bh_hdrlen; 986146768Ssam datap = bp + hdrlen; 98717683Spst /* 988127664Sbms * Short-circuit evaluation: if using BPF filter 989190225Srpaulo * in kernel, no need to do it now - we already know 990190225Srpaulo * the packet passed the filter. 991146768Ssam * 992146768Ssam#ifdef PCAP_FDDIPAD 993146768Ssam * Note: the filter code was generated assuming 994146768Ssam * that p->fddipad was the amount of padding 995146768Ssam * before the header, as that's what's required 996146768Ssam * in the kernel, so we run the filter before 997146768Ssam * skipping that padding. 998146768Ssam#endif 99917683Spst */ 1000190225Srpaulo if (p->md.use_bpf || 1001190225Srpaulo bpf_filter(p->fcode.bf_insns, datap, bhp->bh_datalen, caplen)) { 1002146768Ssam struct pcap_pkthdr pkthdr; 1003146768Ssam 1004146768Ssam pkthdr.ts.tv_sec = bhp->bh_tstamp.tv_sec; 100598530Sfenner#ifdef _AIX 1006127664Sbms /* 1007127664Sbms * AIX's BPF returns seconds/nanoseconds time 1008127664Sbms * stamps, not seconds/microseconds time stamps. 1009127664Sbms */ 1010146768Ssam pkthdr.ts.tv_usec = bhp->bh_tstamp.tv_usec/1000; 1011146768Ssam#else 1012146768Ssam pkthdr.ts.tv_usec = bhp->bh_tstamp.tv_usec; 101398530Sfenner#endif 1014146768Ssam#ifdef PCAP_FDDIPAD 1015146768Ssam if (caplen > pad) 1016146768Ssam pkthdr.caplen = caplen - pad; 1017146768Ssam else 1018146768Ssam pkthdr.caplen = 0; 1019146768Ssam if (bhp->bh_datalen > pad) 1020146768Ssam pkthdr.len = bhp->bh_datalen - pad; 1021146768Ssam else 1022146768Ssam pkthdr.len = 0; 1023146768Ssam datap += pad; 1024146768Ssam#else 1025146768Ssam pkthdr.caplen = caplen; 1026146768Ssam pkthdr.len = bhp->bh_datalen; 1027146768Ssam#endif 1028146768Ssam (*callback)(user, &pkthdr, datap); 1029127664Sbms bp += BPF_WORDALIGN(caplen + hdrlen); 1030127664Sbms if (++n >= cnt && cnt > 0) { 1031127664Sbms p->bp = bp; 1032127664Sbms p->cc = ep - bp; 1033235426Sdelphij /* 1034235426Sdelphij * See comment above about p->cc < 0. 1035235426Sdelphij */ 1036235426Sdelphij if (p->cc < 0) 1037235426Sdelphij p->cc = 0; 1038127664Sbms return (n); 1039127664Sbms } 1040127664Sbms } else { 1041127664Sbms /* 1042127664Sbms * Skip this packet. 1043127664Sbms */ 1044127664Sbms bp += BPF_WORDALIGN(caplen + hdrlen); 104517683Spst } 104617683Spst } 104717683Spst#undef bhp 104817683Spst p->cc = 0; 104917683Spst return (n); 105017683Spst} 105117683Spst 1052146768Ssamstatic int 1053146768Ssampcap_inject_bpf(pcap_t *p, const void *buf, size_t size) 1054146768Ssam{ 1055146768Ssam int ret; 1056146768Ssam 1057146768Ssam ret = write(p->fd, buf, size); 1058146768Ssam#ifdef __APPLE__ 1059146768Ssam if (ret == -1 && errno == EAFNOSUPPORT) { 1060146768Ssam /* 1061146768Ssam * In Mac OS X, there's a bug wherein setting the 1062146768Ssam * BIOCSHDRCMPLT flag causes writes to fail; see, 1063146768Ssam * for example: 1064146768Ssam * 1065146768Ssam * http://cerberus.sourcefire.com/~jeff/archives/patches/macosx/BIOCSHDRCMPLT-10.3.3.patch 1066146768Ssam * 1067146768Ssam * So, if, on OS X, we get EAFNOSUPPORT from the write, we 1068146768Ssam * assume it's due to that bug, and turn off that flag 1069146768Ssam * and try again. If we succeed, it either means that 1070146768Ssam * somebody applied the fix from that URL, or other patches 1071146768Ssam * for that bug from 1072146768Ssam * 1073146768Ssam * http://cerberus.sourcefire.com/~jeff/archives/patches/macosx/ 1074146768Ssam * 1075146768Ssam * and are running a Darwin kernel with those fixes, or 1076146768Ssam * that Apple fixed the problem in some OS X release. 1077146768Ssam */ 1078146768Ssam u_int spoof_eth_src = 0; 1079146768Ssam 1080146768Ssam if (ioctl(p->fd, BIOCSHDRCMPLT, &spoof_eth_src) == -1) { 1081146768Ssam (void)snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1082146768Ssam "send: can't turn off BIOCSHDRCMPLT: %s", 1083146768Ssam pcap_strerror(errno)); 1084190225Srpaulo return (PCAP_ERROR); 1085146768Ssam } 1086146768Ssam 1087146768Ssam /* 1088146768Ssam * Now try the write again. 1089146768Ssam */ 1090146768Ssam ret = write(p->fd, buf, size); 1091146768Ssam } 1092146768Ssam#endif /* __APPLE__ */ 1093146768Ssam if (ret == -1) { 1094146768Ssam snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send: %s", 1095146768Ssam pcap_strerror(errno)); 1096190225Srpaulo return (PCAP_ERROR); 1097146768Ssam } 1098146768Ssam return (ret); 1099146768Ssam} 1100146768Ssam 1101127664Sbms#ifdef _AIX 1102190225Srpaulostatic int 1103127664Sbmsbpf_odminit(char *errbuf) 1104127664Sbms{ 1105127664Sbms char *errstr; 1106127664Sbms 1107127664Sbms if (odm_initialize() == -1) { 1108127664Sbms if (odm_err_msg(odmerrno, &errstr) == -1) 1109127664Sbms errstr = "Unknown error"; 1110127664Sbms snprintf(errbuf, PCAP_ERRBUF_SIZE, 1111127664Sbms "bpf_load: odm_initialize failed: %s", 1112127664Sbms errstr); 1113190225Srpaulo return (PCAP_ERROR); 1114127664Sbms } 1115127664Sbms 1116127664Sbms if ((odmlockid = odm_lock("/etc/objrepos/config_lock", ODM_WAIT)) == -1) { 1117127664Sbms if (odm_err_msg(odmerrno, &errstr) == -1) 1118127664Sbms errstr = "Unknown error"; 1119127664Sbms snprintf(errbuf, PCAP_ERRBUF_SIZE, 1120127664Sbms "bpf_load: odm_lock of /etc/objrepos/config_lock failed: %s", 1121127664Sbms errstr); 1122214518Srpaulo (void)odm_terminate(); 1123190225Srpaulo return (PCAP_ERROR); 1124127664Sbms } 1125127664Sbms 1126127664Sbms return (0); 1127127664Sbms} 1128127664Sbms 1129190225Srpaulostatic int 1130127664Sbmsbpf_odmcleanup(char *errbuf) 1131127664Sbms{ 1132127664Sbms char *errstr; 1133127664Sbms 1134127664Sbms if (odm_unlock(odmlockid) == -1) { 1135214518Srpaulo if (errbuf != NULL) { 1136214518Srpaulo if (odm_err_msg(odmerrno, &errstr) == -1) 1137214518Srpaulo errstr = "Unknown error"; 1138214518Srpaulo snprintf(errbuf, PCAP_ERRBUF_SIZE, 1139214518Srpaulo "bpf_load: odm_unlock failed: %s", 1140214518Srpaulo errstr); 1141214518Srpaulo } 1142190225Srpaulo return (PCAP_ERROR); 1143127664Sbms } 1144127664Sbms 1145127664Sbms if (odm_terminate() == -1) { 1146214518Srpaulo if (errbuf != NULL) { 1147214518Srpaulo if (odm_err_msg(odmerrno, &errstr) == -1) 1148214518Srpaulo errstr = "Unknown error"; 1149214518Srpaulo snprintf(errbuf, PCAP_ERRBUF_SIZE, 1150214518Srpaulo "bpf_load: odm_terminate failed: %s", 1151214518Srpaulo errstr); 1152214518Srpaulo } 1153190225Srpaulo return (PCAP_ERROR); 1154127664Sbms } 1155127664Sbms 1156127664Sbms return (0); 1157127664Sbms} 1158127664Sbms 1159127664Sbmsstatic int 1160127664Sbmsbpf_load(char *errbuf) 1161127664Sbms{ 1162127664Sbms long major; 1163127664Sbms int *minors; 1164127664Sbms int numminors, i, rc; 1165127664Sbms char buf[1024]; 1166127664Sbms struct stat sbuf; 1167127664Sbms struct bpf_config cfg_bpf; 1168127664Sbms struct cfg_load cfg_ld; 1169127664Sbms struct cfg_kmod cfg_km; 1170127664Sbms 1171127664Sbms /* 1172127664Sbms * This is very very close to what happens in the real implementation 1173127664Sbms * but I've fixed some (unlikely) bug situations. 1174127664Sbms */ 1175127664Sbms if (bpfloadedflag) 1176127664Sbms return (0); 1177127664Sbms 1178190225Srpaulo if (bpf_odminit(errbuf) == PCAP_ERROR) 1179190225Srpaulo return (PCAP_ERROR); 1180127664Sbms 1181127664Sbms major = genmajor(BPF_NAME); 1182127664Sbms if (major == -1) { 1183127664Sbms snprintf(errbuf, PCAP_ERRBUF_SIZE, 1184127664Sbms "bpf_load: genmajor failed: %s", pcap_strerror(errno)); 1185214518Srpaulo (void)bpf_odmcleanup(NULL); 1186190225Srpaulo return (PCAP_ERROR); 1187127664Sbms } 1188127664Sbms 1189127664Sbms minors = getminor(major, &numminors, BPF_NAME); 1190127664Sbms if (!minors) { 1191127664Sbms minors = genminor("bpf", major, 0, BPF_MINORS, 1, 1); 1192127664Sbms if (!minors) { 1193127664Sbms snprintf(errbuf, PCAP_ERRBUF_SIZE, 1194127664Sbms "bpf_load: genminor failed: %s", 1195127664Sbms pcap_strerror(errno)); 1196214518Srpaulo (void)bpf_odmcleanup(NULL); 1197190225Srpaulo return (PCAP_ERROR); 1198127664Sbms } 1199127664Sbms } 1200127664Sbms 1201190225Srpaulo if (bpf_odmcleanup(errbuf) == PCAP_ERROR) 1202190225Srpaulo return (PCAP_ERROR); 1203127664Sbms 1204127664Sbms rc = stat(BPF_NODE "0", &sbuf); 1205127664Sbms if (rc == -1 && errno != ENOENT) { 1206127664Sbms snprintf(errbuf, PCAP_ERRBUF_SIZE, 1207127664Sbms "bpf_load: can't stat %s: %s", 1208127664Sbms BPF_NODE "0", pcap_strerror(errno)); 1209190225Srpaulo return (PCAP_ERROR); 1210127664Sbms } 1211127664Sbms 1212127664Sbms if (rc == -1 || getmajor(sbuf.st_rdev) != major) { 1213127664Sbms for (i = 0; i < BPF_MINORS; i++) { 1214127664Sbms sprintf(buf, "%s%d", BPF_NODE, i); 1215127664Sbms unlink(buf); 1216127664Sbms if (mknod(buf, S_IRUSR | S_IFCHR, domakedev(major, i)) == -1) { 1217127664Sbms snprintf(errbuf, PCAP_ERRBUF_SIZE, 1218127664Sbms "bpf_load: can't mknod %s: %s", 1219127664Sbms buf, pcap_strerror(errno)); 1220190225Srpaulo return (PCAP_ERROR); 1221127664Sbms } 1222127664Sbms } 1223127664Sbms } 1224127664Sbms 1225127664Sbms /* Check if the driver is loaded */ 1226127664Sbms memset(&cfg_ld, 0x0, sizeof(cfg_ld)); 1227127664Sbms cfg_ld.path = buf; 1228127664Sbms sprintf(cfg_ld.path, "%s/%s", DRIVER_PATH, BPF_NAME); 1229127664Sbms if ((sysconfig(SYS_QUERYLOAD, (void *)&cfg_ld, sizeof(cfg_ld)) == -1) || 1230127664Sbms (cfg_ld.kmid == 0)) { 1231127664Sbms /* Driver isn't loaded, load it now */ 1232127664Sbms if (sysconfig(SYS_SINGLELOAD, (void *)&cfg_ld, sizeof(cfg_ld)) == -1) { 1233127664Sbms snprintf(errbuf, PCAP_ERRBUF_SIZE, 1234127664Sbms "bpf_load: could not load driver: %s", 1235127664Sbms strerror(errno)); 1236190225Srpaulo return (PCAP_ERROR); 1237127664Sbms } 1238127664Sbms } 1239127664Sbms 1240127664Sbms /* Configure the driver */ 1241127664Sbms cfg_km.cmd = CFG_INIT; 1242127664Sbms cfg_km.kmid = cfg_ld.kmid; 1243127664Sbms cfg_km.mdilen = sizeof(cfg_bpf); 1244190225Srpaulo cfg_km.mdiptr = (void *)&cfg_bpf; 1245127664Sbms for (i = 0; i < BPF_MINORS; i++) { 1246127664Sbms cfg_bpf.devno = domakedev(major, i); 1247127664Sbms if (sysconfig(SYS_CFGKMOD, (void *)&cfg_km, sizeof(cfg_km)) == -1) { 1248127664Sbms snprintf(errbuf, PCAP_ERRBUF_SIZE, 1249127664Sbms "bpf_load: could not configure driver: %s", 1250127664Sbms strerror(errno)); 1251190225Srpaulo return (PCAP_ERROR); 1252127664Sbms } 1253127664Sbms } 1254190225Srpaulo 1255127664Sbms bpfloadedflag = 1; 1256127664Sbms 1257127664Sbms return (0); 1258127664Sbms} 1259127664Sbms#endif 1260127664Sbms 1261190225Srpaulo/* 1262190225Srpaulo * Turn off rfmon mode if necessary. 1263190225Srpaulo */ 1264190225Srpaulostatic void 1265190225Srpaulopcap_cleanup_bpf(pcap_t *p) 126617683Spst{ 1267190225Srpaulo#ifdef HAVE_BSD_IEEE80211 1268190225Srpaulo int sock; 1269190225Srpaulo struct ifmediareq req; 1270190225Srpaulo struct ifreq ifr; 1271172680Smlaier#endif 127217683Spst 1273214518Srpaulo if (p->md.must_do_on_close != 0) { 1274190225Srpaulo /* 1275190225Srpaulo * There's something we have to do when closing this 1276190225Srpaulo * pcap_t. 1277190225Srpaulo */ 1278190225Srpaulo#ifdef HAVE_BSD_IEEE80211 1279214518Srpaulo if (p->md.must_do_on_close & MUST_CLEAR_RFMON) { 1280190225Srpaulo /* 1281190225Srpaulo * We put the interface into rfmon mode; 1282190225Srpaulo * take it out of rfmon mode. 1283190225Srpaulo * 1284190225Srpaulo * XXX - if somebody else wants it in rfmon 1285190225Srpaulo * mode, this code cannot know that, so it'll take 1286190225Srpaulo * it out of rfmon mode. 1287190225Srpaulo */ 1288190225Srpaulo sock = socket(AF_INET, SOCK_DGRAM, 0); 1289190225Srpaulo if (sock == -1) { 1290190225Srpaulo fprintf(stderr, 1291190225Srpaulo "Can't restore interface flags (socket() failed: %s).\n" 1292190225Srpaulo "Please adjust manually.\n", 1293190225Srpaulo strerror(errno)); 1294190225Srpaulo } else { 1295190225Srpaulo memset(&req, 0, sizeof(req)); 1296190225Srpaulo strncpy(req.ifm_name, p->md.device, 1297190225Srpaulo sizeof(req.ifm_name)); 1298190225Srpaulo if (ioctl(sock, SIOCGIFMEDIA, &req) < 0) { 1299190225Srpaulo fprintf(stderr, 1300190225Srpaulo "Can't restore interface flags (SIOCGIFMEDIA failed: %s).\n" 1301190225Srpaulo "Please adjust manually.\n", 1302190225Srpaulo strerror(errno)); 1303190225Srpaulo } else { 1304190225Srpaulo if (req.ifm_current & IFM_IEEE80211_MONITOR) { 1305190225Srpaulo /* 1306190225Srpaulo * Rfmon mode is currently on; 1307190225Srpaulo * turn it off. 1308190225Srpaulo */ 1309190225Srpaulo memset(&ifr, 0, sizeof(ifr)); 1310190225Srpaulo (void)strncpy(ifr.ifr_name, 1311190225Srpaulo p->md.device, 1312190225Srpaulo sizeof(ifr.ifr_name)); 1313190225Srpaulo ifr.ifr_media = 1314190225Srpaulo req.ifm_current & ~IFM_IEEE80211_MONITOR; 1315190225Srpaulo if (ioctl(sock, SIOCSIFMEDIA, 1316190225Srpaulo &ifr) == -1) { 1317190225Srpaulo fprintf(stderr, 1318190225Srpaulo "Can't restore interface flags (SIOCSIFMEDIA failed: %s).\n" 1319190225Srpaulo "Please adjust manually.\n", 1320190225Srpaulo strerror(errno)); 1321190225Srpaulo } 1322190225Srpaulo } 1323190225Srpaulo } 1324190225Srpaulo close(sock); 1325190225Srpaulo } 1326190225Srpaulo } 1327190225Srpaulo#endif /* HAVE_BSD_IEEE80211 */ 1328127664Sbms 1329146768Ssam /* 1330190225Srpaulo * Take this pcap out of the list of pcaps for which we 1331190225Srpaulo * have to take the interface out of some mode. 1332146768Ssam */ 1333190225Srpaulo pcap_remove_from_pcaps_to_close(p); 1334214518Srpaulo p->md.must_do_on_close = 0; 1335190225Srpaulo } 133617683Spst 1337190225Srpaulo#ifdef HAVE_ZEROCOPY_BPF 1338190225Srpaulo if (p->md.zerocopy) { 1339235426Sdelphij /* 1340235426Sdelphij * Delete the mappings. Note that p->buffer gets 1341235426Sdelphij * initialized to one of the mmapped regions in 1342235426Sdelphij * this case, so do not try and free it directly; 1343235426Sdelphij * null it out so that pcap_cleanup_live_common() 1344235426Sdelphij * doesn't try to free it. 1345235426Sdelphij */ 1346190225Srpaulo if (p->md.zbuf1 != MAP_FAILED && p->md.zbuf1 != NULL) 1347235426Sdelphij (void) munmap(p->md.zbuf1, p->md.zbufsize); 1348190225Srpaulo if (p->md.zbuf2 != MAP_FAILED && p->md.zbuf2 != NULL) 1349235426Sdelphij (void) munmap(p->md.zbuf2, p->md.zbufsize); 1350222654Scsjp p->buffer = NULL; 1351235426Sdelphij p->buffer = NULL; 1352190225Srpaulo } 1353172680Smlaier#endif 1354190225Srpaulo if (p->md.device != NULL) { 1355190225Srpaulo free(p->md.device); 1356190225Srpaulo p->md.device = NULL; 1357190225Srpaulo } 1358190225Srpaulo pcap_cleanup_live_common(p); 135917683Spst} 136017683Spst 1361190225Srpaulostatic int 1362190225Srpaulocheck_setif_failure(pcap_t *p, int error) 1363190225Srpaulo{ 1364190225Srpaulo#ifdef __APPLE__ 1365190225Srpaulo int fd; 1366190225Srpaulo struct ifreq ifr; 1367190225Srpaulo int err; 1368146768Ssam#endif 1369146768Ssam 1370190225Srpaulo if (error == ENXIO) { 1371190225Srpaulo /* 1372190225Srpaulo * No such device exists. 1373190225Srpaulo */ 1374190225Srpaulo#ifdef __APPLE__ 1375190225Srpaulo if (p->opt.rfmon && strncmp(p->opt.source, "wlt", 3) == 0) { 1376190225Srpaulo /* 1377190225Srpaulo * Monitor mode was requested, and we're trying 1378190225Srpaulo * to open a "wltN" device. Assume that this 1379190225Srpaulo * is 10.4 and that we were asked to open an 1380190225Srpaulo * "enN" device; if that device exists, return 1381190225Srpaulo * "monitor mode not supported on the device". 1382190225Srpaulo */ 1383190225Srpaulo fd = socket(AF_INET, SOCK_DGRAM, 0); 1384190225Srpaulo if (fd != -1) { 1385190225Srpaulo strlcpy(ifr.ifr_name, "en", 1386190225Srpaulo sizeof(ifr.ifr_name)); 1387190225Srpaulo strlcat(ifr.ifr_name, p->opt.source + 3, 1388190225Srpaulo sizeof(ifr.ifr_name)); 1389190225Srpaulo if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) { 1390190225Srpaulo /* 1391190225Srpaulo * We assume this failed because 1392190225Srpaulo * the underlying device doesn't 1393190225Srpaulo * exist. 1394190225Srpaulo */ 1395190225Srpaulo err = PCAP_ERROR_NO_SUCH_DEVICE; 1396214518Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1397214518Srpaulo "SIOCGIFFLAGS on %s failed: %s", 1398214518Srpaulo ifr.ifr_name, pcap_strerror(errno)); 1399190225Srpaulo } else { 1400190225Srpaulo /* 1401190225Srpaulo * The underlying "enN" device 1402190225Srpaulo * exists, but there's no 1403190225Srpaulo * corresponding "wltN" device; 1404190225Srpaulo * that means that the "enN" 1405190225Srpaulo * device doesn't support 1406190225Srpaulo * monitor mode, probably because 1407190225Srpaulo * it's an Ethernet device rather 1408190225Srpaulo * than a wireless device. 1409190225Srpaulo */ 1410190225Srpaulo err = PCAP_ERROR_RFMON_NOTSUP; 1411190225Srpaulo } 1412190225Srpaulo close(fd); 1413190225Srpaulo } else { 1414190225Srpaulo /* 1415190225Srpaulo * We can't find out whether there's 1416190225Srpaulo * an underlying "enN" device, so 1417190225Srpaulo * just report "no such device". 1418190225Srpaulo */ 1419190225Srpaulo err = PCAP_ERROR_NO_SUCH_DEVICE; 1420214518Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1421214518Srpaulo "socket() failed: %s", 1422214518Srpaulo pcap_strerror(errno)); 1423190225Srpaulo } 1424190225Srpaulo return (err); 1425190225Srpaulo } 1426190225Srpaulo#endif 1427190225Srpaulo /* 1428190225Srpaulo * No such device. 1429190225Srpaulo */ 1430214518Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCSETIF failed: %s", 1431214518Srpaulo pcap_strerror(errno)); 1432190225Srpaulo return (PCAP_ERROR_NO_SUCH_DEVICE); 1433190225Srpaulo } else if (errno == ENETDOWN) { 1434190225Srpaulo /* 1435190225Srpaulo * Return a "network down" indication, so that 1436190225Srpaulo * the application can report that rather than 1437190225Srpaulo * saying we had a mysterious failure and 1438190225Srpaulo * suggest that they report a problem to the 1439190225Srpaulo * libpcap developers. 1440190225Srpaulo */ 1441190225Srpaulo return (PCAP_ERROR_IFACE_NOT_UP); 1442190225Srpaulo } else { 1443190225Srpaulo /* 1444190225Srpaulo * Some other error; fill in the error string, and 1445190225Srpaulo * return PCAP_ERROR. 1446190225Srpaulo */ 1447190225Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCSETIF: %s: %s", 1448190225Srpaulo p->opt.source, pcap_strerror(errno)); 1449190225Srpaulo return (PCAP_ERROR); 1450190225Srpaulo } 1451190225Srpaulo} 1452190225Srpaulo 1453214518Srpaulo/* 1454214518Srpaulo * Default capture buffer size. 1455214518Srpaulo * 32K isn't very much for modern machines with fast networks; we 1456214518Srpaulo * pick .5M, as that's the maximum on at least some systems with BPF. 1457214518Srpaulo */ 1458214518Srpaulo#define DEFAULT_BUFSIZE 524288 1459214518Srpaulo 1460190225Srpaulostatic int 1461190225Srpaulopcap_activate_bpf(pcap_t *p) 146217683Spst{ 1463190225Srpaulo int status = 0; 146417683Spst int fd; 1465235426Sdelphij#ifdef LIFNAMSIZ 1466235426Sdelphij struct lifreq ifr; 1467235426Sdelphij char *ifrname = ifr.lifr_name; 1468235426Sdelphij const size_t ifnamsiz = sizeof(ifr.lifr_name); 1469235426Sdelphij#else 147017683Spst struct ifreq ifr; 1471235426Sdelphij char *ifrname = ifr.ifr_name; 1472235426Sdelphij const size_t ifnamsiz = sizeof(ifr.ifr_name); 1473235426Sdelphij#endif 147417683Spst struct bpf_version bv; 1475190225Srpaulo#ifdef __APPLE__ 1476190225Srpaulo int sockfd; 1477190225Srpaulo char *wltdev = NULL; 1478190225Srpaulo#endif 1479127664Sbms#ifdef BIOCGDLTLIST 1480109839Sfenner struct bpf_dltlist bdl; 1481190225Srpaulo#if defined(__APPLE__) || defined(HAVE_BSD_IEEE80211) 1482190225Srpaulo int new_dlt; 1483127664Sbms#endif 1484190225Srpaulo#endif /* BIOCGDLTLIST */ 1485146768Ssam#if defined(BIOCGHDRCMPLT) && defined(BIOCSHDRCMPLT) 1486146768Ssam u_int spoof_eth_src = 1; 1487146768Ssam#endif 148817683Spst u_int v; 1489146768Ssam struct bpf_insn total_insn; 1490146768Ssam struct bpf_program total_prog; 1491127664Sbms struct utsname osinfo; 149217683Spst 1493127664Sbms#ifdef HAVE_DAG_API 1494127664Sbms if (strstr(device, "dag")) { 1495127664Sbms return dag_open_live(device, snaplen, promisc, to_ms, ebuf); 1496127664Sbms } 1497127664Sbms#endif /* HAVE_DAG_API */ 1498109839Sfenner 1499127664Sbms#ifdef BIOCGDLTLIST 1500127664Sbms memset(&bdl, 0, sizeof(bdl)); 1501190225Srpaulo int have_osinfo = 0; 1502190225Srpaulo#ifdef HAVE_ZEROCOPY_BPF 1503190225Srpaulo struct bpf_zbuf bz; 1504190225Srpaulo u_int bufmode, zbufmax; 1505127664Sbms#endif 1506127664Sbms 1507190225Srpaulo fd = bpf_open(p); 1508190225Srpaulo if (fd < 0) { 1509190225Srpaulo status = fd; 1510190225Srpaulo goto bad; 151117683Spst } 151217683Spst 151317683Spst p->fd = fd; 151417683Spst 151517683Spst if (ioctl(fd, BIOCVERSION, (caddr_t)&bv) < 0) { 1516190225Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCVERSION: %s", 151775107Sfenner pcap_strerror(errno)); 1518190225Srpaulo status = PCAP_ERROR; 151917683Spst goto bad; 152017683Spst } 152117683Spst if (bv.bv_major != BPF_MAJOR_VERSION || 152217683Spst bv.bv_minor < BPF_MINOR_VERSION) { 1523190225Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 152475107Sfenner "kernel bpf filter out of date"); 1525190225Srpaulo status = PCAP_ERROR; 152617683Spst goto bad; 152717683Spst } 152875107Sfenner 1529190225Srpaulo p->md.device = strdup(p->opt.source); 1530190225Srpaulo if (p->md.device == NULL) { 1531190225Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "strdup: %s", 1532190225Srpaulo pcap_strerror(errno)); 1533190225Srpaulo status = PCAP_ERROR; 1534190225Srpaulo goto bad; 1535190225Srpaulo } 1536190225Srpaulo 153775107Sfenner /* 1538190225Srpaulo * Try finding a good size for the buffer; 32768 may be too 1539190225Srpaulo * big, so keep cutting it in half until we find a size 1540190225Srpaulo * that works, or run out of sizes to try. If the default 1541190225Srpaulo * is larger, don't make it smaller. 1542190225Srpaulo * 1543190225Srpaulo * XXX - there should be a user-accessible hook to set the 1544190225Srpaulo * initial buffer size. 1545190225Srpaulo * Attempt to find out the version of the OS on which we're running. 1546190225Srpaulo */ 1547190225Srpaulo if (uname(&osinfo) == 0) 1548190225Srpaulo have_osinfo = 1; 1549190225Srpaulo 1550190225Srpaulo#ifdef __APPLE__ 1551190225Srpaulo /* 1552190225Srpaulo * See comment in pcap_can_set_rfmon_bpf() for an explanation 1553190225Srpaulo * of why we check the version number. 1554190225Srpaulo */ 1555190225Srpaulo if (p->opt.rfmon) { 1556190225Srpaulo if (have_osinfo) { 1557190225Srpaulo /* 1558190225Srpaulo * We assume osinfo.sysname is "Darwin", because 1559190225Srpaulo * __APPLE__ is defined. We just check the version. 1560190225Srpaulo */ 1561190225Srpaulo if (osinfo.release[0] < '8' && 1562190225Srpaulo osinfo.release[1] == '.') { 1563190225Srpaulo /* 1564190225Srpaulo * 10.3 (Darwin 7.x) or earlier. 1565190225Srpaulo */ 1566190225Srpaulo status = PCAP_ERROR_RFMON_NOTSUP; 1567190225Srpaulo goto bad; 1568190225Srpaulo } 1569190225Srpaulo if (osinfo.release[0] == '8' && 1570190225Srpaulo osinfo.release[1] == '.') { 1571190225Srpaulo /* 1572190225Srpaulo * 10.4 (Darwin 8.x). s/en/wlt/ 1573190225Srpaulo */ 1574190225Srpaulo if (strncmp(p->opt.source, "en", 2) != 0) { 1575190225Srpaulo /* 1576190225Srpaulo * Not an enN device; check 1577190225Srpaulo * whether the device even exists. 1578190225Srpaulo */ 1579190225Srpaulo sockfd = socket(AF_INET, SOCK_DGRAM, 0); 1580190225Srpaulo if (sockfd != -1) { 1581235426Sdelphij strlcpy(ifrname, 1582235426Sdelphij p->opt.source, ifnamsiz); 1583190225Srpaulo if (ioctl(sockfd, SIOCGIFFLAGS, 1584190225Srpaulo (char *)&ifr) < 0) { 1585190225Srpaulo /* 1586190225Srpaulo * We assume this 1587190225Srpaulo * failed because 1588190225Srpaulo * the underlying 1589190225Srpaulo * device doesn't 1590190225Srpaulo * exist. 1591190225Srpaulo */ 1592190225Srpaulo status = PCAP_ERROR_NO_SUCH_DEVICE; 1593214518Srpaulo snprintf(p->errbuf, 1594214518Srpaulo PCAP_ERRBUF_SIZE, 1595214518Srpaulo "SIOCGIFFLAGS failed: %s", 1596214518Srpaulo pcap_strerror(errno)); 1597190225Srpaulo } else 1598190225Srpaulo status = PCAP_ERROR_RFMON_NOTSUP; 1599190225Srpaulo close(sockfd); 1600190225Srpaulo } else { 1601190225Srpaulo /* 1602190225Srpaulo * We can't find out whether 1603190225Srpaulo * the device exists, so just 1604190225Srpaulo * report "no such device". 1605190225Srpaulo */ 1606190225Srpaulo status = PCAP_ERROR_NO_SUCH_DEVICE; 1607214518Srpaulo snprintf(p->errbuf, 1608214518Srpaulo PCAP_ERRBUF_SIZE, 1609214518Srpaulo "socket() failed: %s", 1610214518Srpaulo pcap_strerror(errno)); 1611190225Srpaulo } 1612190225Srpaulo goto bad; 1613190225Srpaulo } 1614190225Srpaulo wltdev = malloc(strlen(p->opt.source) + 2); 1615190225Srpaulo if (wltdev == NULL) { 1616190225Srpaulo (void)snprintf(p->errbuf, 1617190225Srpaulo PCAP_ERRBUF_SIZE, "malloc: %s", 1618190225Srpaulo pcap_strerror(errno)); 1619190225Srpaulo status = PCAP_ERROR; 1620190225Srpaulo goto bad; 1621190225Srpaulo } 1622190225Srpaulo strcpy(wltdev, "wlt"); 1623190225Srpaulo strcat(wltdev, p->opt.source + 2); 1624190225Srpaulo free(p->opt.source); 1625190225Srpaulo p->opt.source = wltdev; 1626190225Srpaulo } 1627190225Srpaulo /* 1628190225Srpaulo * Everything else is 10.5 or later; for those, 1629190225Srpaulo * we just open the enN device, and set the DLT. 1630190225Srpaulo */ 1631190225Srpaulo } 1632190225Srpaulo } 1633190225Srpaulo#endif /* __APPLE__ */ 1634190225Srpaulo#ifdef HAVE_ZEROCOPY_BPF 1635190225Srpaulo /* 1636183102Scsjp * If the BPF extension to set buffer mode is present, try setting 1637183102Scsjp * the mode to zero-copy. If that fails, use regular buffering. If 1638183102Scsjp * it succeeds but other setup fails, return an error to the user. 163939291Sfenner */ 1640183102Scsjp bufmode = BPF_BUFMODE_ZBUF; 1641183102Scsjp if (ioctl(fd, BIOCSETBUFMODE, (caddr_t)&bufmode) == 0) { 1642190225Srpaulo /* 1643190225Srpaulo * We have zerocopy BPF; use it. 1644190225Srpaulo */ 1645190225Srpaulo p->md.zerocopy = 1; 1646183102Scsjp 1647183102Scsjp /* 1648183102Scsjp * How to pick a buffer size: first, query the maximum buffer 1649183102Scsjp * size supported by zero-copy. This also lets us quickly 1650183102Scsjp * determine whether the kernel generally supports zero-copy. 1651190225Srpaulo * Then, if a buffer size was specified, use that, otherwise 1652190225Srpaulo * query the default buffer size, which reflects kernel 1653183102Scsjp * policy for a desired default. Round to the nearest page 1654183102Scsjp * size. 165575107Sfenner */ 1656183102Scsjp if (ioctl(fd, BIOCGETZMAX, (caddr_t)&zbufmax) < 0) { 1657190225Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCGETZMAX: %s", 1658183102Scsjp pcap_strerror(errno)); 1659183102Scsjp goto bad; 1660183102Scsjp } 1661190225Srpaulo 1662190225Srpaulo if (p->opt.buffer_size != 0) { 1663190225Srpaulo /* 1664190225Srpaulo * A buffer size was explicitly specified; use it. 1665190225Srpaulo */ 1666190225Srpaulo v = p->opt.buffer_size; 1667190225Srpaulo } else { 1668190225Srpaulo if ((ioctl(fd, BIOCGBLEN, (caddr_t)&v) < 0) || 1669214518Srpaulo v < DEFAULT_BUFSIZE) 1670214518Srpaulo v = DEFAULT_BUFSIZE; 1671190225Srpaulo } 1672183102Scsjp#ifndef roundup 1673190225Srpaulo#define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */ 1674183102Scsjp#endif 1675190225Srpaulo p->md.zbufsize = roundup(v, getpagesize()); 1676190225Srpaulo if (p->md.zbufsize > zbufmax) 1677190225Srpaulo p->md.zbufsize = zbufmax; 1678190225Srpaulo p->md.zbuf1 = mmap(NULL, p->md.zbufsize, PROT_READ | PROT_WRITE, 1679183102Scsjp MAP_ANON, -1, 0); 1680190225Srpaulo p->md.zbuf2 = mmap(NULL, p->md.zbufsize, PROT_READ | PROT_WRITE, 1681183102Scsjp MAP_ANON, -1, 0); 1682190225Srpaulo if (p->md.zbuf1 == MAP_FAILED || p->md.zbuf2 == MAP_FAILED) { 1683190225Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "mmap: %s", 1684183102Scsjp pcap_strerror(errno)); 1685183102Scsjp goto bad; 1686183102Scsjp } 1687183102Scsjp bzero(&bz, sizeof(bz)); 1688190225Srpaulo bz.bz_bufa = p->md.zbuf1; 1689190225Srpaulo bz.bz_bufb = p->md.zbuf2; 1690190225Srpaulo bz.bz_buflen = p->md.zbufsize; 1691183102Scsjp if (ioctl(fd, BIOCSETZBUF, (caddr_t)&bz) < 0) { 1692190225Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCSETZBUF: %s", 1693183102Scsjp pcap_strerror(errno)); 1694183102Scsjp goto bad; 1695183102Scsjp } 1696235426Sdelphij (void)strncpy(ifrname, p->opt.source, ifnamsiz); 1697183102Scsjp if (ioctl(fd, BIOCSETIF, (caddr_t)&ifr) < 0) { 1698190225Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCSETIF: %s: %s", 1699190225Srpaulo p->opt.source, pcap_strerror(errno)); 170075107Sfenner goto bad; 170175107Sfenner } 1702190225Srpaulo v = p->md.zbufsize - sizeof(struct bpf_zbuf_header); 1703190225Srpaulo } else 1704183102Scsjp#endif 1705190225Srpaulo { 1706183102Scsjp /* 1707190225Srpaulo * We don't have zerocopy BPF. 1708190225Srpaulo * Set the buffer size. 1709183102Scsjp */ 1710190225Srpaulo if (p->opt.buffer_size != 0) { 1711190225Srpaulo /* 1712190225Srpaulo * A buffer size was explicitly specified; use it. 1713183102Scsjp */ 1714190225Srpaulo if (ioctl(fd, BIOCSBLEN, 1715190225Srpaulo (caddr_t)&p->opt.buffer_size) < 0) { 1716190225Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1717190225Srpaulo "BIOCSBLEN: %s: %s", p->opt.source, 1718190225Srpaulo pcap_strerror(errno)); 1719190225Srpaulo status = PCAP_ERROR; 1720190225Srpaulo goto bad; 1721190225Srpaulo } 1722183102Scsjp 1723190225Srpaulo /* 1724190225Srpaulo * Now bind to the device. 1725190225Srpaulo */ 1726235426Sdelphij (void)strncpy(ifrname, p->opt.source, ifnamsiz); 1727235426Sdelphij#ifdef BIOCSETLIF 1728235426Sdelphij if (ioctl(fd, BIOCSETLIF, (caddr_t)&ifr) < 0) 1729235426Sdelphij#else 1730235426Sdelphij if (ioctl(fd, BIOCSETIF, (caddr_t)&ifr) < 0) 1731235426Sdelphij#endif 1732235426Sdelphij { 1733190225Srpaulo status = check_setif_failure(p, errno); 1734190225Srpaulo goto bad; 1735190225Srpaulo } 1736190225Srpaulo } else { 1737190225Srpaulo /* 1738190225Srpaulo * No buffer size was explicitly specified. 1739190225Srpaulo * 1740214518Srpaulo * Try finding a good size for the buffer; 1741214518Srpaulo * DEFAULT_BUFSIZE may be too big, so keep 1742214518Srpaulo * cutting it in half until we find a size 1743214518Srpaulo * that works, or run out of sizes to try. 1744190225Srpaulo * If the default is larger, don't make it smaller. 1745190225Srpaulo */ 1746190225Srpaulo if ((ioctl(fd, BIOCGBLEN, (caddr_t)&v) < 0) || 1747214518Srpaulo v < DEFAULT_BUFSIZE) 1748214518Srpaulo v = DEFAULT_BUFSIZE; 1749190225Srpaulo for ( ; v != 0; v >>= 1) { 1750190225Srpaulo /* 1751190225Srpaulo * Ignore the return value - this is because the 1752190225Srpaulo * call fails on BPF systems that don't have 1753190225Srpaulo * kernel malloc. And if the call fails, it's 1754190225Srpaulo * no big deal, we just continue to use the 1755190225Srpaulo * standard buffer size. 1756190225Srpaulo */ 1757190225Srpaulo (void) ioctl(fd, BIOCSBLEN, (caddr_t)&v); 1758183102Scsjp 1759235426Sdelphij (void)strncpy(ifrname, p->opt.source, ifnamsiz); 1760235426Sdelphij#ifdef BIOCSETLIF 1761235426Sdelphij if (ioctl(fd, BIOCSETLIF, (caddr_t)&ifr) >= 0) 1762235426Sdelphij#else 1763190225Srpaulo if (ioctl(fd, BIOCSETIF, (caddr_t)&ifr) >= 0) 1764235426Sdelphij#endif 1765190225Srpaulo break; /* that size worked; we're done */ 1766190225Srpaulo 1767190225Srpaulo if (errno != ENOBUFS) { 1768190225Srpaulo status = check_setif_failure(p, errno); 1769190225Srpaulo goto bad; 1770190225Srpaulo } 1771190225Srpaulo } 1772190225Srpaulo 1773190225Srpaulo if (v == 0) { 1774190225Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1775190225Srpaulo "BIOCSBLEN: %s: No buffer size worked", 1776190225Srpaulo p->opt.source); 1777190225Srpaulo status = PCAP_ERROR; 1778183102Scsjp goto bad; 1779183102Scsjp } 1780183102Scsjp } 178117683Spst } 1782183102Scsjp#endif 178375107Sfenner 178417683Spst /* Get the data link layer type. */ 178517683Spst if (ioctl(fd, BIOCGDLT, (caddr_t)&v) < 0) { 1786190225Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCGDLT: %s", 178775107Sfenner pcap_strerror(errno)); 1788190225Srpaulo status = PCAP_ERROR; 178917683Spst goto bad; 179017683Spst } 1791190225Srpaulo 179298530Sfenner#ifdef _AIX 179398530Sfenner /* 179498530Sfenner * AIX's BPF returns IFF_ types, not DLT_ types, in BIOCGDLT. 179598530Sfenner */ 179656889Sfenner switch (v) { 179798530Sfenner 179898530Sfenner case IFT_ETHER: 179998530Sfenner case IFT_ISO88023: 180098530Sfenner v = DLT_EN10MB; 180198530Sfenner break; 180298530Sfenner 180398530Sfenner case IFT_FDDI: 180498530Sfenner v = DLT_FDDI; 180598530Sfenner break; 180698530Sfenner 180798530Sfenner case IFT_ISO88025: 180898530Sfenner v = DLT_IEEE802; 180998530Sfenner break; 181098530Sfenner 1811127664Sbms case IFT_LOOP: 1812127664Sbms v = DLT_NULL; 1813127664Sbms break; 1814127664Sbms 181598530Sfenner default: 181675107Sfenner /* 181798530Sfenner * We don't know what to map this to yet. 181875107Sfenner */ 1819190225Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "unknown interface type %u", 182098530Sfenner v); 1821190225Srpaulo status = PCAP_ERROR; 182298530Sfenner goto bad; 182356889Sfenner } 182456889Sfenner#endif 182539291Sfenner#if _BSDI_VERSION - 0 >= 199510 182639291Sfenner /* The SLIP and PPP link layer header changed in BSD/OS 2.1 */ 182739291Sfenner switch (v) { 182839291Sfenner 182939291Sfenner case DLT_SLIP: 183039291Sfenner v = DLT_SLIP_BSDOS; 183139291Sfenner break; 183239291Sfenner 183339291Sfenner case DLT_PPP: 183439291Sfenner v = DLT_PPP_BSDOS; 183539291Sfenner break; 183656889Sfenner 183756889Sfenner case 11: /*DLT_FR*/ 1838127664Sbms v = DLT_FRELAY; 183956889Sfenner break; 184056889Sfenner 184156889Sfenner case 12: /*DLT_C_HDLC*/ 184256889Sfenner v = DLT_CHDLC; 184356889Sfenner break; 184439291Sfenner } 184539291Sfenner#endif 184617683Spst 1847127664Sbms#ifdef BIOCGDLTLIST 1848109839Sfenner /* 1849127664Sbms * We know the default link type -- now determine all the DLTs 1850127664Sbms * this interface supports. If this fails with EINVAL, it's 1851127664Sbms * not fatal; we just don't get to use the feature later. 1852109839Sfenner */ 1853190225Srpaulo if (get_dlt_list(fd, v, &bdl, p->errbuf) == -1) { 1854190225Srpaulo status = PCAP_ERROR; 1855190225Srpaulo goto bad; 1856190225Srpaulo } 1857190225Srpaulo p->dlt_count = bdl.bfl_len; 1858190225Srpaulo p->dlt_list = bdl.bfl_list; 1859146768Ssam 1860190225Srpaulo#ifdef __APPLE__ 1861190225Srpaulo /* 1862190225Srpaulo * Monitor mode fun, continued. 1863190225Srpaulo * 1864190225Srpaulo * For 10.5 and, we're assuming, later releases, as noted above, 1865190225Srpaulo * 802.1 adapters that support monitor mode offer both DLT_EN10MB, 1866190225Srpaulo * DLT_IEEE802_11, and possibly some 802.11-plus-radio-information 1867190225Srpaulo * DLT_ value. Choosing one of the 802.11 DLT_ values will turn 1868190225Srpaulo * monitor mode on. 1869190225Srpaulo * 1870190225Srpaulo * Therefore, if the user asked for monitor mode, we filter out 1871190225Srpaulo * the DLT_EN10MB value, as you can't get that in monitor mode, 1872190225Srpaulo * and, if the user didn't ask for monitor mode, we filter out 1873190225Srpaulo * the 802.11 DLT_ values, because selecting those will turn 1874190225Srpaulo * monitor mode on. Then, for monitor mode, if an 802.11-plus- 1875190225Srpaulo * radio DLT_ value is offered, we try to select that, otherwise 1876190225Srpaulo * we try to select DLT_IEEE802_11. 1877190225Srpaulo */ 1878190225Srpaulo if (have_osinfo) { 1879190225Srpaulo if (isdigit((unsigned)osinfo.release[0]) && 1880190225Srpaulo (osinfo.release[0] == '9' || 1881190225Srpaulo isdigit((unsigned)osinfo.release[1]))) { 1882190225Srpaulo /* 1883190225Srpaulo * 10.5 (Darwin 9.x), or later. 1884190225Srpaulo */ 1885190225Srpaulo new_dlt = find_802_11(&bdl); 1886190225Srpaulo if (new_dlt != -1) { 1887190225Srpaulo /* 1888190225Srpaulo * We have at least one 802.11 DLT_ value, 1889190225Srpaulo * so this is an 802.11 interface. 1890190225Srpaulo * new_dlt is the best of the 802.11 1891190225Srpaulo * DLT_ values in the list. 1892190225Srpaulo */ 1893190225Srpaulo if (p->opt.rfmon) { 1894190225Srpaulo /* 1895190225Srpaulo * Our caller wants monitor mode. 1896190225Srpaulo * Purge DLT_EN10MB from the list 1897190225Srpaulo * of link-layer types, as selecting 1898190225Srpaulo * it will keep monitor mode off. 1899190225Srpaulo */ 1900190225Srpaulo remove_en(p); 1901190225Srpaulo 1902190225Srpaulo /* 1903190225Srpaulo * If the new mode we want isn't 1904190225Srpaulo * the default mode, attempt to 1905190225Srpaulo * select the new mode. 1906190225Srpaulo */ 1907190225Srpaulo if (new_dlt != v) { 1908190225Srpaulo if (ioctl(p->fd, BIOCSDLT, 1909190225Srpaulo &new_dlt) != -1) { 1910190225Srpaulo /* 1911190225Srpaulo * We succeeded; 1912190225Srpaulo * make this the 1913190225Srpaulo * new DLT_ value. 1914190225Srpaulo */ 1915190225Srpaulo v = new_dlt; 1916190225Srpaulo } 1917190225Srpaulo } 1918190225Srpaulo } else { 1919190225Srpaulo /* 1920190225Srpaulo * Our caller doesn't want 1921190225Srpaulo * monitor mode. Unless this 1922190225Srpaulo * is being done by pcap_open_live(), 1923190225Srpaulo * purge the 802.11 link-layer types 1924190225Srpaulo * from the list, as selecting 1925190225Srpaulo * one of them will turn monitor 1926190225Srpaulo * mode on. 1927190225Srpaulo */ 1928190225Srpaulo if (!p->oldstyle) 1929190225Srpaulo remove_802_11(p); 1930190225Srpaulo } 1931190225Srpaulo } else { 1932190225Srpaulo if (p->opt.rfmon) { 1933190225Srpaulo /* 1934190225Srpaulo * The caller requested monitor 1935190225Srpaulo * mode, but we have no 802.11 1936190225Srpaulo * link-layer types, so they 1937190225Srpaulo * can't have it. 1938190225Srpaulo */ 1939190225Srpaulo status = PCAP_ERROR_RFMON_NOTSUP; 1940190225Srpaulo goto bad; 1941190225Srpaulo } 1942190225Srpaulo } 1943109839Sfenner } 1944190225Srpaulo } 1945190225Srpaulo#elif defined(HAVE_BSD_IEEE80211) 1946190225Srpaulo /* 1947190225Srpaulo * *BSD with the new 802.11 ioctls. 1948190225Srpaulo * Do we want monitor mode? 1949190225Srpaulo */ 1950190225Srpaulo if (p->opt.rfmon) { 1951190225Srpaulo /* 1952190225Srpaulo * Try to put the interface into monitor mode. 1953190225Srpaulo */ 1954190225Srpaulo status = monitor_mode(p, 1); 1955190225Srpaulo if (status != 0) { 1956190225Srpaulo /* 1957190225Srpaulo * We failed. 1958190225Srpaulo */ 1959109839Sfenner goto bad; 1960109839Sfenner } 1961109839Sfenner 1962146768Ssam /* 1963190225Srpaulo * We're in monitor mode. 1964190225Srpaulo * Try to find the best 802.11 DLT_ value and, if we 1965190225Srpaulo * succeed, try to switch to that mode if we're not 1966190225Srpaulo * already in that mode. 1967146768Ssam */ 1968190225Srpaulo new_dlt = find_802_11(&bdl); 1969190225Srpaulo if (new_dlt != -1) { 1970190225Srpaulo /* 1971190225Srpaulo * We have at least one 802.11 DLT_ value. 1972190225Srpaulo * new_dlt is the best of the 802.11 1973190225Srpaulo * DLT_ values in the list. 1974190225Srpaulo * 1975190225Srpaulo * If the new mode we want isn't the default mode, 1976190225Srpaulo * attempt to select the new mode. 1977190225Srpaulo */ 1978190225Srpaulo if (new_dlt != v) { 1979190225Srpaulo if (ioctl(p->fd, BIOCSDLT, &new_dlt) != -1) { 1980190225Srpaulo /* 1981190225Srpaulo * We succeeded; make this the 1982190225Srpaulo * new DLT_ value. 1983190225Srpaulo */ 1984190225Srpaulo v = new_dlt; 1985146768Ssam } 1986146768Ssam } 1987146768Ssam } 1988109839Sfenner } 1989190225Srpaulo#endif /* various platforms */ 1990190225Srpaulo#endif /* BIOCGDLTLIST */ 1991109839Sfenner 1992146768Ssam /* 1993146768Ssam * If this is an Ethernet device, and we don't have a DLT_ list, 1994146768Ssam * give it a list with DLT_EN10MB and DLT_DOCSIS. (That'd give 1995146768Ssam * 802.11 interfaces DLT_DOCSIS, which isn't the right thing to 1996146768Ssam * do, but there's not much we can do about that without finding 1997146768Ssam * some other way of determining whether it's an Ethernet or 802.11 1998146768Ssam * device.) 1999146768Ssam */ 2000190225Srpaulo if (v == DLT_EN10MB && p->dlt_count == 0) { 2001146768Ssam p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2); 2002146768Ssam /* 2003146768Ssam * If that fails, just leave the list empty. 2004146768Ssam */ 2005146768Ssam if (p->dlt_list != NULL) { 2006146768Ssam p->dlt_list[0] = DLT_EN10MB; 2007146768Ssam p->dlt_list[1] = DLT_DOCSIS; 2008146768Ssam p->dlt_count = 2; 2009146768Ssam } 2010146768Ssam } 2011190225Srpaulo#ifdef PCAP_FDDIPAD 2012190225Srpaulo if (v == DLT_FDDI) 2013190225Srpaulo p->fddipad = PCAP_FDDIPAD; 2014190225Srpaulo else 2015190225Srpaulo p->fddipad = 0; 2016190225Srpaulo#endif 2017190225Srpaulo p->linktype = v; 2018190225Srpaulo 2019146768Ssam#if defined(BIOCGHDRCMPLT) && defined(BIOCSHDRCMPLT) 2020146768Ssam /* 2021146768Ssam * Do a BIOCSHDRCMPLT, if defined, to turn that flag on, so 2022146768Ssam * the link-layer source address isn't forcibly overwritten. 2023146768Ssam * (Should we ignore errors? Should we do this only if 2024146768Ssam * we're open for writing?) 2025146768Ssam * 2026146768Ssam * XXX - I seem to remember some packet-sending bug in some 2027146768Ssam * BSDs - check CVS log for "bpf.c"? 2028146768Ssam */ 2029146768Ssam if (ioctl(fd, BIOCSHDRCMPLT, &spoof_eth_src) == -1) { 2030190225Srpaulo (void)snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 2031146768Ssam "BIOCSHDRCMPLT: %s", pcap_strerror(errno)); 2032190225Srpaulo status = PCAP_ERROR; 2033146768Ssam goto bad; 2034146768Ssam } 2035146768Ssam#endif 203617683Spst /* set timeout */ 2037190225Srpaulo#ifdef HAVE_ZEROCOPY_BPF 2038190225Srpaulo if (p->md.timeout != 0 && !p->md.zerocopy) { 2039190225Srpaulo#else 2040190225Srpaulo if (p->md.timeout) { 2041190225Srpaulo#endif 2042127664Sbms /* 2043127664Sbms * XXX - is this seconds/nanoseconds in AIX? 2044127664Sbms * (Treating it as such doesn't fix the timeout 2045127664Sbms * problem described below.) 2046214518Srpaulo * 2047214518Srpaulo * XXX - Mac OS X 10.6 mishandles BIOCSRTIMEOUT in 2048214518Srpaulo * 64-bit userland - it takes, as an argument, a 2049214518Srpaulo * "struct BPF_TIMEVAL", which has 32-bit tv_sec 2050214518Srpaulo * and tv_usec, rather than a "struct timeval". 2051214518Srpaulo * 2052214518Srpaulo * If this platform defines "struct BPF_TIMEVAL", 2053214518Srpaulo * we check whether the structure size in BIOCSRTIMEOUT 2054214518Srpaulo * is that of a "struct timeval" and, if not, we use 2055214518Srpaulo * a "struct BPF_TIMEVAL" rather than a "struct timeval". 2056214518Srpaulo * (That way, if the bug is fixed in a future release, 2057214518Srpaulo * we will still do the right thing.) 2058127664Sbms */ 205917683Spst struct timeval to; 2060214518Srpaulo#ifdef HAVE_STRUCT_BPF_TIMEVAL 2061214518Srpaulo struct BPF_TIMEVAL bpf_to; 2062214518Srpaulo 2063214518Srpaulo if (IOCPARM_LEN(BIOCSRTIMEOUT) != sizeof(struct timeval)) { 2064214518Srpaulo bpf_to.tv_sec = p->md.timeout / 1000; 2065214518Srpaulo bpf_to.tv_usec = (p->md.timeout * 1000) % 1000000; 2066214518Srpaulo if (ioctl(p->fd, BIOCSRTIMEOUT, (caddr_t)&bpf_to) < 0) { 2067214518Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 2068214518Srpaulo "BIOCSRTIMEOUT: %s", pcap_strerror(errno)); 2069214518Srpaulo status = PCAP_ERROR; 2070214518Srpaulo goto bad; 2071214518Srpaulo } 2072214518Srpaulo } else { 2073214518Srpaulo#endif 2074214518Srpaulo to.tv_sec = p->md.timeout / 1000; 2075214518Srpaulo to.tv_usec = (p->md.timeout * 1000) % 1000000; 2076214518Srpaulo if (ioctl(p->fd, BIOCSRTIMEOUT, (caddr_t)&to) < 0) { 2077214518Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 2078214518Srpaulo "BIOCSRTIMEOUT: %s", pcap_strerror(errno)); 2079214518Srpaulo status = PCAP_ERROR; 2080214518Srpaulo goto bad; 2081214518Srpaulo } 2082214518Srpaulo#ifdef HAVE_STRUCT_BPF_TIMEVAL 208317683Spst } 2084214518Srpaulo#endif 208517683Spst } 208675107Sfenner 208775107Sfenner#ifdef _AIX 208875107Sfenner#ifdef BIOCIMMEDIATE 208975107Sfenner /* 209075107Sfenner * Darren Reed notes that 209175107Sfenner * 209275107Sfenner * On AIX (4.2 at least), if BIOCIMMEDIATE is not set, the 209375107Sfenner * timeout appears to be ignored and it waits until the buffer 209475107Sfenner * is filled before returning. The result of not having it 209575107Sfenner * set is almost worse than useless if your BPF filter 209675107Sfenner * is reducing things to only a few packets (i.e. one every 209775107Sfenner * second or so). 209875107Sfenner * 209975107Sfenner * so we turn BIOCIMMEDIATE mode on if this is AIX. 210075107Sfenner * 210175107Sfenner * We don't turn it on for other platforms, as that means we 210275107Sfenner * get woken up for every packet, which may not be what we want; 210375107Sfenner * in the Winter 1993 USENIX paper on BPF, they say: 210475107Sfenner * 210575107Sfenner * Since a process might want to look at every packet on a 210675107Sfenner * network and the time between packets can be only a few 210775107Sfenner * microseconds, it is not possible to do a read system call 210875107Sfenner * per packet and BPF must collect the data from several 210975107Sfenner * packets and return it as a unit when the monitoring 211075107Sfenner * application does a read. 211175107Sfenner * 211275107Sfenner * which I infer is the reason for the timeout - it means we 211375107Sfenner * wait that amount of time, in the hopes that more packets 211475107Sfenner * will arrive and we'll get them all with one read. 211575107Sfenner * 211675107Sfenner * Setting BIOCIMMEDIATE mode on FreeBSD (and probably other 211775107Sfenner * BSDs) causes the timeout to be ignored. 211875107Sfenner * 211975107Sfenner * On the other hand, some platforms (e.g., Linux) don't support 212075107Sfenner * timeouts, they just hand stuff to you as soon as it arrives; 212175107Sfenner * if that doesn't cause a problem on those platforms, it may 212275107Sfenner * be OK to have BIOCIMMEDIATE mode on BSD as well. 212375107Sfenner * 212475107Sfenner * (Note, though, that applications may depend on the read 212575107Sfenner * completing, even if no packets have arrived, when the timeout 212675107Sfenner * expires, e.g. GUI applications that have to check for input 212775107Sfenner * while waiting for packets to arrive; a non-zero timeout 212875107Sfenner * prevents "select()" from working right on FreeBSD and 212975107Sfenner * possibly other BSDs, as the timer doesn't start until a 213075107Sfenner * "read()" is done, so the timer isn't in effect if the 213175107Sfenner * application is blocked on a "select()", and the "select()" 213275107Sfenner * doesn't get woken up for a BPF device until the buffer 213375107Sfenner * fills up.) 213475107Sfenner */ 213575107Sfenner v = 1; 213675107Sfenner if (ioctl(p->fd, BIOCIMMEDIATE, &v) < 0) { 2137190225Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCIMMEDIATE: %s", 213875107Sfenner pcap_strerror(errno)); 2139190225Srpaulo status = PCAP_ERROR; 214075107Sfenner goto bad; 214175107Sfenner } 214275107Sfenner#endif /* BIOCIMMEDIATE */ 214375107Sfenner#endif /* _AIX */ 214475107Sfenner 2145190225Srpaulo if (p->opt.promisc) { 2146190225Srpaulo /* set promiscuous mode, just warn if it fails */ 214798530Sfenner if (ioctl(p->fd, BIOCPROMISC, NULL) < 0) { 2148190225Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCPROMISC: %s", 214998530Sfenner pcap_strerror(errno)); 2150190225Srpaulo status = PCAP_WARNING_PROMISC_NOTSUP; 215198530Sfenner } 215298530Sfenner } 215317683Spst 215417683Spst if (ioctl(fd, BIOCGBLEN, (caddr_t)&v) < 0) { 2155190225Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCGBLEN: %s", 215675107Sfenner pcap_strerror(errno)); 2157190225Srpaulo status = PCAP_ERROR; 215817683Spst goto bad; 215917683Spst } 216017683Spst p->bufsize = v; 2161190225Srpaulo#ifdef HAVE_ZEROCOPY_BPF 2162190225Srpaulo if (!p->md.zerocopy) { 2163183102Scsjp#endif 2164190225Srpaulo p->buffer = (u_char *)malloc(p->bufsize); 2165190225Srpaulo if (p->buffer == NULL) { 2166190225Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", 2167190225Srpaulo pcap_strerror(errno)); 2168190225Srpaulo status = PCAP_ERROR; 2169190225Srpaulo goto bad; 2170190225Srpaulo } 2171127664Sbms#ifdef _AIX 2172190225Srpaulo /* For some strange reason this seems to prevent the EFAULT 2173190225Srpaulo * problems we have experienced from AIX BPF. */ 2174190225Srpaulo memset(p->buffer, 0x0, p->bufsize); 2175127664Sbms#endif 2176190225Srpaulo#ifdef HAVE_ZEROCOPY_BPF 2177183102Scsjp } 2178183102Scsjp#endif 217917683Spst 2180127664Sbms /* 2181146768Ssam * If there's no filter program installed, there's 2182146768Ssam * no indication to the kernel of what the snapshot 2183146768Ssam * length should be, so no snapshotting is done. 2184146768Ssam * 2185146768Ssam * Therefore, when we open the device, we install 2186146768Ssam * an "accept everything" filter with the specified 2187146768Ssam * snapshot length. 2188146768Ssam */ 2189146768Ssam total_insn.code = (u_short)(BPF_RET | BPF_K); 2190146768Ssam total_insn.jt = 0; 2191146768Ssam total_insn.jf = 0; 2192190225Srpaulo total_insn.k = p->snapshot; 2193146768Ssam 2194146768Ssam total_prog.bf_len = 1; 2195146768Ssam total_prog.bf_insns = &total_insn; 2196146768Ssam if (ioctl(p->fd, BIOCSETF, (caddr_t)&total_prog) < 0) { 2197190225Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCSETF: %s", 2198146768Ssam pcap_strerror(errno)); 2199190225Srpaulo status = PCAP_ERROR; 2200146768Ssam goto bad; 2201146768Ssam } 2202146768Ssam 2203146768Ssam /* 2204127664Sbms * On most BPF platforms, either you can do a "select()" or 2205127664Sbms * "poll()" on a BPF file descriptor and it works correctly, 2206127664Sbms * or you can do it and it will return "readable" if the 2207127664Sbms * hold buffer is full but not if the timeout expires *and* 2208127664Sbms * a non-blocking read will, if the hold buffer is empty 2209127664Sbms * but the store buffer isn't empty, rotate the buffers 2210127664Sbms * and return what packets are available. 2211127664Sbms * 2212127664Sbms * In the latter case, the fact that a non-blocking read 2213127664Sbms * will give you the available packets means you can work 2214127664Sbms * around the failure of "select()" and "poll()" to wake up 2215127664Sbms * and return "readable" when the timeout expires by using 2216127664Sbms * the timeout as the "select()" or "poll()" timeout, putting 2217127664Sbms * the BPF descriptor into non-blocking mode, and read from 2218127664Sbms * it regardless of whether "select()" reports it as readable 2219127664Sbms * or not. 2220127664Sbms * 2221127664Sbms * However, in FreeBSD 4.3 and 4.4, "select()" and "poll()" 2222127664Sbms * won't wake up and return "readable" if the timer expires 2223127664Sbms * and non-blocking reads return EWOULDBLOCK if the hold 2224127664Sbms * buffer is empty, even if the store buffer is non-empty. 2225127664Sbms * 2226127664Sbms * This means the workaround in question won't work. 2227127664Sbms * 2228127664Sbms * Therefore, on FreeBSD 4.3 and 4.4, we set "p->selectable_fd" 2229127664Sbms * to -1, which means "sorry, you can't use 'select()' or 'poll()' 2230127664Sbms * here". On all other BPF platforms, we set it to the FD for 2231127664Sbms * the BPF device; in NetBSD, OpenBSD, and Darwin, a non-blocking 2232127664Sbms * read will, if the hold buffer is empty and the store buffer 2233127664Sbms * isn't empty, rotate the buffers and return what packets are 2234127664Sbms * there (and in sufficiently recent versions of OpenBSD 2235127664Sbms * "select()" and "poll()" should work correctly). 2236127664Sbms * 2237127664Sbms * XXX - what about AIX? 2238127664Sbms */ 2239147894Ssam p->selectable_fd = p->fd; /* assume select() works until we know otherwise */ 2240190225Srpaulo if (have_osinfo) { 2241127664Sbms /* 2242127664Sbms * We can check what OS this is. 2243127664Sbms */ 2244147894Ssam if (strcmp(osinfo.sysname, "FreeBSD") == 0) { 2245147894Ssam if (strncmp(osinfo.release, "4.3-", 4) == 0 || 2246147894Ssam strncmp(osinfo.release, "4.4-", 4) == 0) 2247147894Ssam p->selectable_fd = -1; 2248147894Ssam } 2249127664Sbms } 2250127664Sbms 2251127664Sbms p->read_op = pcap_read_bpf; 2252146768Ssam p->inject_op = pcap_inject_bpf; 2253127664Sbms p->setfilter_op = pcap_setfilter_bpf; 2254147894Ssam p->setdirection_op = pcap_setdirection_bpf; 2255127664Sbms p->set_datalink_op = pcap_set_datalink_bpf; 2256235426Sdelphij p->getnonblock_op = pcap_getnonblock_bpf; 2257235426Sdelphij p->setnonblock_op = pcap_setnonblock_bpf; 2258127664Sbms p->stats_op = pcap_stats_bpf; 2259190225Srpaulo p->cleanup_op = pcap_cleanup_bpf; 2260127664Sbms 2261190225Srpaulo return (status); 226217683Spst bad: 2263190225Srpaulo pcap_cleanup_bpf(p); 2264190225Srpaulo return (status); 226517683Spst} 226617683Spst 226717683Spstint 2268127664Sbmspcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf) 226917683Spst{ 2270127664Sbms#ifdef HAVE_DAG_API 2271127664Sbms if (dag_platform_finddevs(alldevsp, errbuf) < 0) 2272127664Sbms return (-1); 2273127664Sbms#endif /* HAVE_DAG_API */ 2274214518Srpaulo#ifdef HAVE_SNF_API 2275214518Srpaulo if (snf_platform_finddevs(alldevsp, errbuf) < 0) 2276214518Srpaulo return (-1); 2277214518Srpaulo#endif /* HAVE_SNF_API */ 2278127664Sbms 2279127664Sbms return (0); 2280127664Sbms} 2281127664Sbms 2282190225Srpaulo#ifdef HAVE_BSD_IEEE80211 2283127664Sbmsstatic int 2284190225Srpaulomonitor_mode(pcap_t *p, int set) 2285127664Sbms{ 2286190225Srpaulo int sock; 2287190225Srpaulo struct ifmediareq req; 2288190225Srpaulo int *media_list; 2289190225Srpaulo int i; 2290190225Srpaulo int can_do; 2291190225Srpaulo struct ifreq ifr; 2292190225Srpaulo 2293190225Srpaulo sock = socket(AF_INET, SOCK_DGRAM, 0); 2294190225Srpaulo if (sock == -1) { 2295190225Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "can't open socket: %s", 2296190225Srpaulo pcap_strerror(errno)); 2297190225Srpaulo return (PCAP_ERROR); 2298190225Srpaulo } 2299190225Srpaulo 2300190225Srpaulo memset(&req, 0, sizeof req); 2301190225Srpaulo strncpy(req.ifm_name, p->opt.source, sizeof req.ifm_name); 2302190225Srpaulo 230356889Sfenner /* 2304190225Srpaulo * Find out how many media types we have. 230556889Sfenner */ 2306190225Srpaulo if (ioctl(sock, SIOCGIFMEDIA, &req) < 0) { 2307127664Sbms /* 2308190225Srpaulo * Can't get the media types. 2309127664Sbms */ 2310235426Sdelphij switch (errno) { 2311235426Sdelphij 2312235426Sdelphij case ENXIO: 2313190225Srpaulo /* 2314235426Sdelphij * There's no such device. 2315235426Sdelphij */ 2316235426Sdelphij close(sock); 2317235426Sdelphij return (PCAP_ERROR_NO_SUCH_DEVICE); 2318235426Sdelphij 2319235426Sdelphij case EINVAL: 2320235426Sdelphij /* 2321190225Srpaulo * Interface doesn't support SIOC{G,S}IFMEDIA. 2322190225Srpaulo */ 2323190225Srpaulo close(sock); 2324190225Srpaulo return (PCAP_ERROR_RFMON_NOTSUP); 2325235426Sdelphij 2326235426Sdelphij default: 2327235426Sdelphij snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 2328235426Sdelphij "SIOCGIFMEDIA 1: %s", pcap_strerror(errno)); 2329235426Sdelphij close(sock); 2330235426Sdelphij return (PCAP_ERROR); 2331190225Srpaulo } 2332127664Sbms } 2333190225Srpaulo if (req.ifm_count == 0) { 2334190225Srpaulo /* 2335190225Srpaulo * No media types. 2336190225Srpaulo */ 2337190225Srpaulo close(sock); 2338190225Srpaulo return (PCAP_ERROR_RFMON_NOTSUP); 2339190225Srpaulo } 2340127664Sbms 2341127664Sbms /* 2342190225Srpaulo * Allocate a buffer to hold all the media types, and 2343190225Srpaulo * get the media types. 2344190225Srpaulo */ 2345190225Srpaulo media_list = malloc(req.ifm_count * sizeof(int)); 2346190225Srpaulo if (media_list == NULL) { 2347190225Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", 2348190225Srpaulo pcap_strerror(errno)); 2349190225Srpaulo close(sock); 2350190225Srpaulo return (PCAP_ERROR); 2351190225Srpaulo } 2352190225Srpaulo req.ifm_ulist = media_list; 2353190225Srpaulo if (ioctl(sock, SIOCGIFMEDIA, &req) < 0) { 2354190225Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "SIOCGIFMEDIA: %s", 2355190225Srpaulo pcap_strerror(errno)); 2356190225Srpaulo free(media_list); 2357190225Srpaulo close(sock); 2358190225Srpaulo return (PCAP_ERROR); 2359190225Srpaulo } 2360190225Srpaulo 2361190225Srpaulo /* 2362190225Srpaulo * Look for an 802.11 "automatic" media type. 2363190225Srpaulo * We assume that all 802.11 adapters have that media type, 2364190225Srpaulo * and that it will carry the monitor mode supported flag. 2365190225Srpaulo */ 2366190225Srpaulo can_do = 0; 2367190225Srpaulo for (i = 0; i < req.ifm_count; i++) { 2368190225Srpaulo if (IFM_TYPE(media_list[i]) == IFM_IEEE80211 2369190225Srpaulo && IFM_SUBTYPE(media_list[i]) == IFM_AUTO) { 2370190225Srpaulo /* OK, does it do monitor mode? */ 2371190225Srpaulo if (media_list[i] & IFM_IEEE80211_MONITOR) { 2372190225Srpaulo can_do = 1; 2373190225Srpaulo break; 2374190225Srpaulo } 2375190225Srpaulo } 2376190225Srpaulo } 2377190225Srpaulo free(media_list); 2378190225Srpaulo if (!can_do) { 2379190225Srpaulo /* 2380190225Srpaulo * This adapter doesn't support monitor mode. 2381190225Srpaulo */ 2382190225Srpaulo close(sock); 2383190225Srpaulo return (PCAP_ERROR_RFMON_NOTSUP); 2384190225Srpaulo } 2385190225Srpaulo 2386190225Srpaulo if (set) { 2387190225Srpaulo /* 2388190225Srpaulo * Don't just check whether we can enable monitor mode, 2389190225Srpaulo * do so, if it's not already enabled. 2390190225Srpaulo */ 2391190225Srpaulo if ((req.ifm_current & IFM_IEEE80211_MONITOR) == 0) { 2392190225Srpaulo /* 2393190225Srpaulo * Monitor mode isn't currently on, so turn it on, 2394190225Srpaulo * and remember that we should turn it off when the 2395190225Srpaulo * pcap_t is closed. 2396190225Srpaulo */ 2397190225Srpaulo 2398190225Srpaulo /* 2399190225Srpaulo * If we haven't already done so, arrange to have 2400190225Srpaulo * "pcap_close_all()" called when we exit. 2401190225Srpaulo */ 2402190225Srpaulo if (!pcap_do_addexit(p)) { 2403190225Srpaulo /* 2404190225Srpaulo * "atexit()" failed; don't put the interface 2405190225Srpaulo * in monitor mode, just give up. 2406190225Srpaulo */ 2407190225Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 2408190225Srpaulo "atexit failed"); 2409190225Srpaulo close(sock); 2410190225Srpaulo return (PCAP_ERROR); 2411190225Srpaulo } 2412190225Srpaulo memset(&ifr, 0, sizeof(ifr)); 2413190225Srpaulo (void)strncpy(ifr.ifr_name, p->opt.source, 2414190225Srpaulo sizeof(ifr.ifr_name)); 2415190225Srpaulo ifr.ifr_media = req.ifm_current | IFM_IEEE80211_MONITOR; 2416190225Srpaulo if (ioctl(sock, SIOCSIFMEDIA, &ifr) == -1) { 2417190225Srpaulo snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 2418190225Srpaulo "SIOCSIFMEDIA: %s", pcap_strerror(errno)); 2419190225Srpaulo close(sock); 2420190225Srpaulo return (PCAP_ERROR); 2421190225Srpaulo } 2422190225Srpaulo 2423214518Srpaulo p->md.must_do_on_close |= MUST_CLEAR_RFMON; 2424190225Srpaulo 2425190225Srpaulo /* 2426190225Srpaulo * Add this to the list of pcaps to close when we exit. 2427190225Srpaulo */ 2428190225Srpaulo pcap_add_to_pcaps_to_close(p); 2429190225Srpaulo } 2430190225Srpaulo } 2431190225Srpaulo return (0); 2432190225Srpaulo} 2433190225Srpaulo#endif /* HAVE_BSD_IEEE80211 */ 2434190225Srpaulo 2435190225Srpaulo#if defined(BIOCGDLTLIST) && (defined(__APPLE__) || defined(HAVE_BSD_IEEE80211)) 2436190225Srpaulo/* 2437190225Srpaulo * Check whether we have any 802.11 link-layer types; return the best 2438190225Srpaulo * of the 802.11 link-layer types if we find one, and return -1 2439190225Srpaulo * otherwise. 2440190225Srpaulo * 2441190225Srpaulo * DLT_IEEE802_11_RADIO, with the radiotap header, is considered the 2442190225Srpaulo * best 802.11 link-layer type; any of the other 802.11-plus-radio 2443190225Srpaulo * headers are second-best; 802.11 with no radio information is 2444190225Srpaulo * the least good. 2445190225Srpaulo */ 2446190225Srpaulostatic int 2447190225Srpaulofind_802_11(struct bpf_dltlist *bdlp) 2448190225Srpaulo{ 2449190225Srpaulo int new_dlt; 2450190225Srpaulo int i; 2451190225Srpaulo 2452190225Srpaulo /* 2453190225Srpaulo * Scan the list of DLT_ values, looking for 802.11 values, 2454190225Srpaulo * and, if we find any, choose the best of them. 2455190225Srpaulo */ 2456190225Srpaulo new_dlt = -1; 2457190225Srpaulo for (i = 0; i < bdlp->bfl_len; i++) { 2458190225Srpaulo switch (bdlp->bfl_list[i]) { 2459190225Srpaulo 2460190225Srpaulo case DLT_IEEE802_11: 2461190225Srpaulo /* 2462190225Srpaulo * 802.11, but no radio. 2463190225Srpaulo * 2464190225Srpaulo * Offer this, and select it as the new mode 2465190225Srpaulo * unless we've already found an 802.11 2466190225Srpaulo * header with radio information. 2467190225Srpaulo */ 2468190225Srpaulo if (new_dlt == -1) 2469190225Srpaulo new_dlt = bdlp->bfl_list[i]; 2470190225Srpaulo break; 2471190225Srpaulo 2472190225Srpaulo case DLT_PRISM_HEADER: 2473190225Srpaulo case DLT_AIRONET_HEADER: 2474190225Srpaulo case DLT_IEEE802_11_RADIO_AVS: 2475190225Srpaulo /* 2476190225Srpaulo * 802.11 with radio, but not radiotap. 2477190225Srpaulo * 2478190225Srpaulo * Offer this, and select it as the new mode 2479190225Srpaulo * unless we've already found the radiotap DLT_. 2480190225Srpaulo */ 2481190225Srpaulo if (new_dlt != DLT_IEEE802_11_RADIO) 2482190225Srpaulo new_dlt = bdlp->bfl_list[i]; 2483190225Srpaulo break; 2484190225Srpaulo 2485190225Srpaulo case DLT_IEEE802_11_RADIO: 2486190225Srpaulo /* 2487190225Srpaulo * 802.11 with radiotap. 2488190225Srpaulo * 2489190225Srpaulo * Offer this, and select it as the new mode. 2490190225Srpaulo */ 2491190225Srpaulo new_dlt = bdlp->bfl_list[i]; 2492190225Srpaulo break; 2493190225Srpaulo 2494190225Srpaulo default: 2495190225Srpaulo /* 2496190225Srpaulo * Not 802.11. 2497190225Srpaulo */ 2498190225Srpaulo break; 2499190225Srpaulo } 2500190225Srpaulo } 2501190225Srpaulo 2502190225Srpaulo return (new_dlt); 2503190225Srpaulo} 2504190225Srpaulo#endif /* defined(BIOCGDLTLIST) && (defined(__APPLE__) || defined(HAVE_BSD_IEEE80211)) */ 2505190225Srpaulo 2506190225Srpaulo#if defined(__APPLE__) && defined(BIOCGDLTLIST) 2507190225Srpaulo/* 2508214518Srpaulo * Remove DLT_EN10MB from the list of DLT_ values, as we're in monitor mode, 2509214518Srpaulo * and DLT_EN10MB isn't supported in monitor mode. 2510190225Srpaulo */ 2511190225Srpaulostatic void 2512190225Srpauloremove_en(pcap_t *p) 2513190225Srpaulo{ 2514190225Srpaulo int i, j; 2515190225Srpaulo 2516190225Srpaulo /* 2517190225Srpaulo * Scan the list of DLT_ values and discard DLT_EN10MB. 2518190225Srpaulo */ 2519190225Srpaulo j = 0; 2520190225Srpaulo for (i = 0; i < p->dlt_count; i++) { 2521190225Srpaulo switch (p->dlt_list[i]) { 2522190225Srpaulo 2523190225Srpaulo case DLT_EN10MB: 2524190225Srpaulo /* 2525190225Srpaulo * Don't offer this one. 2526190225Srpaulo */ 2527190225Srpaulo continue; 2528190225Srpaulo 2529190225Srpaulo default: 2530190225Srpaulo /* 2531190225Srpaulo * Just copy this mode over. 2532190225Srpaulo */ 2533190225Srpaulo break; 2534190225Srpaulo } 2535190225Srpaulo 2536190225Srpaulo /* 2537190225Srpaulo * Copy this DLT_ value to its new position. 2538190225Srpaulo */ 2539190225Srpaulo p->dlt_list[j] = p->dlt_list[i]; 2540190225Srpaulo j++; 2541190225Srpaulo } 2542190225Srpaulo 2543190225Srpaulo /* 2544190225Srpaulo * Set the DLT_ count to the number of entries we copied. 2545190225Srpaulo */ 2546190225Srpaulo p->dlt_count = j; 2547190225Srpaulo} 2548190225Srpaulo 2549190225Srpaulo/* 2550214518Srpaulo * Remove 802.11 link-layer types from the list of DLT_ values, as 2551214518Srpaulo * we're not in monitor mode, and those DLT_ values will switch us 2552214518Srpaulo * to monitor mode. 2553190225Srpaulo */ 2554190225Srpaulostatic void 2555190225Srpauloremove_802_11(pcap_t *p) 2556190225Srpaulo{ 2557190225Srpaulo int i, j; 2558190225Srpaulo 2559190225Srpaulo /* 2560190225Srpaulo * Scan the list of DLT_ values and discard 802.11 values. 2561190225Srpaulo */ 2562190225Srpaulo j = 0; 2563190225Srpaulo for (i = 0; i < p->dlt_count; i++) { 2564190225Srpaulo switch (p->dlt_list[i]) { 2565190225Srpaulo 2566190225Srpaulo case DLT_IEEE802_11: 2567190225Srpaulo case DLT_PRISM_HEADER: 2568190225Srpaulo case DLT_AIRONET_HEADER: 2569190225Srpaulo case DLT_IEEE802_11_RADIO: 2570190225Srpaulo case DLT_IEEE802_11_RADIO_AVS: 2571190225Srpaulo /* 2572190225Srpaulo * 802.11. Don't offer this one. 2573190225Srpaulo */ 2574190225Srpaulo continue; 2575190225Srpaulo 2576190225Srpaulo default: 2577190225Srpaulo /* 2578190225Srpaulo * Just copy this mode over. 2579190225Srpaulo */ 2580190225Srpaulo break; 2581190225Srpaulo } 2582190225Srpaulo 2583190225Srpaulo /* 2584190225Srpaulo * Copy this DLT_ value to its new position. 2585190225Srpaulo */ 2586190225Srpaulo p->dlt_list[j] = p->dlt_list[i]; 2587190225Srpaulo j++; 2588190225Srpaulo } 2589190225Srpaulo 2590190225Srpaulo /* 2591190225Srpaulo * Set the DLT_ count to the number of entries we copied. 2592190225Srpaulo */ 2593190225Srpaulo p->dlt_count = j; 2594190225Srpaulo} 2595190225Srpaulo#endif /* defined(__APPLE__) && defined(BIOCGDLTLIST) */ 2596190225Srpaulo 2597190225Srpaulostatic int 2598190225Srpaulopcap_setfilter_bpf(pcap_t *p, struct bpf_program *fp) 2599190225Srpaulo{ 2600190225Srpaulo /* 2601127664Sbms * Free any user-mode filter we might happen to have installed. 2602127664Sbms */ 2603127664Sbms pcap_freecode(&p->fcode); 2604127664Sbms 2605127664Sbms /* 2606127664Sbms * Try to install the kernel filter. 2607127664Sbms */ 2608190225Srpaulo if (ioctl(p->fd, BIOCSETF, (caddr_t)fp) == 0) { 2609190225Srpaulo /* 2610190225Srpaulo * It worked. 2611190225Srpaulo */ 2612190225Srpaulo p->md.use_bpf = 1; /* filtering in the kernel */ 2613190225Srpaulo 2614190225Srpaulo /* 2615190225Srpaulo * Discard any previously-received packets, as they might 2616190225Srpaulo * have passed whatever filter was formerly in effect, but 2617190225Srpaulo * might not pass this filter (BIOCSETF discards packets 2618190225Srpaulo * buffered in the kernel, so you can lose packets in any 2619190225Srpaulo * case). 2620190225Srpaulo */ 2621190225Srpaulo p->cc = 0; 2622190225Srpaulo return (0); 2623190225Srpaulo } 2624190225Srpaulo 2625190225Srpaulo /* 2626190225Srpaulo * We failed. 2627190225Srpaulo * 2628190225Srpaulo * If it failed with EINVAL, that's probably because the program 2629190225Srpaulo * is invalid or too big. Validate it ourselves; if we like it 2630190225Srpaulo * (we currently allow backward branches, to support protochain), 2631190225Srpaulo * run it in userland. (There's no notion of "too big" for 2632190225Srpaulo * userland.) 2633190225Srpaulo * 2634190225Srpaulo * Otherwise, just give up. 2635190225Srpaulo * XXX - if the copy of the program into the kernel failed, 2636190225Srpaulo * we will get EINVAL rather than, say, EFAULT on at least 2637190225Srpaulo * some kernels. 2638190225Srpaulo */ 2639190225Srpaulo if (errno != EINVAL) { 264075107Sfenner snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCSETF: %s", 264175107Sfenner pcap_strerror(errno)); 264217683Spst return (-1); 264317683Spst } 2644146768Ssam 2645146768Ssam /* 2646190225Srpaulo * install_bpf_program() validates the program. 2647190225Srpaulo * 2648190225Srpaulo * XXX - what if we already have a filter in the kernel? 2649146768Ssam */ 2650190225Srpaulo if (install_bpf_program(p, fp) < 0) 2651190225Srpaulo return (-1); 2652190225Srpaulo p->md.use_bpf = 0; /* filtering in userland */ 265317683Spst return (0); 265417683Spst} 2655109839Sfenner 2656147894Ssam/* 2657147894Ssam * Set direction flag: Which packets do we accept on a forwarding 2658147894Ssam * single device? IN, OUT or both? 2659147894Ssam */ 2660127664Sbmsstatic int 2661162012Ssampcap_setdirection_bpf(pcap_t *p, pcap_direction_t d) 2662147894Ssam{ 2663167035Sjkim#if defined(BIOCSDIRECTION) 2664167035Sjkim u_int direction; 2665167035Sjkim 2666167035Sjkim direction = (d == PCAP_D_IN) ? BPF_D_IN : 2667167035Sjkim ((d == PCAP_D_OUT) ? BPF_D_OUT : BPF_D_INOUT); 2668167035Sjkim if (ioctl(p->fd, BIOCSDIRECTION, &direction) == -1) { 2669167035Sjkim (void) snprintf(p->errbuf, sizeof(p->errbuf), 2670167035Sjkim "Cannot set direction to %s: %s", 2671167035Sjkim (d == PCAP_D_IN) ? "PCAP_D_IN" : 2672167035Sjkim ((d == PCAP_D_OUT) ? "PCAP_D_OUT" : "PCAP_D_INOUT"), 2673167035Sjkim strerror(errno)); 2674167035Sjkim return (-1); 2675167035Sjkim } 2676167035Sjkim return (0); 2677167035Sjkim#elif defined(BIOCSSEESENT) 2678147894Ssam u_int seesent; 2679147894Ssam 2680147894Ssam /* 2681162012Ssam * We don't support PCAP_D_OUT. 2682147894Ssam */ 2683162012Ssam if (d == PCAP_D_OUT) { 2684147894Ssam snprintf(p->errbuf, sizeof(p->errbuf), 2685162012Ssam "Setting direction to PCAP_D_OUT is not supported on BPF"); 2686147894Ssam return -1; 2687147894Ssam } 2688167035Sjkim 2689162012Ssam seesent = (d == PCAP_D_INOUT); 2690147894Ssam if (ioctl(p->fd, BIOCSSEESENT, &seesent) == -1) { 2691147894Ssam (void) snprintf(p->errbuf, sizeof(p->errbuf), 2692147894Ssam "Cannot set direction to %s: %s", 2693162012Ssam (d == PCAP_D_INOUT) ? "PCAP_D_INOUT" : "PCAP_D_IN", 2694147894Ssam strerror(errno)); 2695147894Ssam return (-1); 2696147894Ssam } 2697147894Ssam return (0); 2698147894Ssam#else 2699147894Ssam (void) snprintf(p->errbuf, sizeof(p->errbuf), 2700147894Ssam "This system doesn't support BIOCSSEESENT, so the direction can't be set"); 2701147894Ssam return (-1); 2702147894Ssam#endif 2703147894Ssam} 2704147894Ssam 2705147894Ssamstatic int 2706127664Sbmspcap_set_datalink_bpf(pcap_t *p, int dlt) 2707109839Sfenner{ 2708127664Sbms#ifdef BIOCSDLT 2709109839Sfenner if (ioctl(p->fd, BIOCSDLT, &dlt) == -1) { 2710109839Sfenner (void) snprintf(p->errbuf, sizeof(p->errbuf), 2711109839Sfenner "Cannot set DLT %d: %s", dlt, strerror(errno)); 2712127664Sbms return (-1); 2713109839Sfenner } 2714127664Sbms#endif 2715127664Sbms return (0); 2716109839Sfenner} 2717