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MFV r333668:

Browse source 
Vendor import two upstream commits:
c1bb8784abd3ca978e376b0d10e324db0491237b
9c4af7213cc2543a1f5586d8f2c19f86aa0cbe72

When using tcpdump -I -i wlanN and wlanN is not a monitor mode VAP,
tcpdump will print an error message saying rfmon is not supported.

Give a concise explanation as to how one might solve this problem by
creating a monitor mode VAP.

MFC after:      1 month
Approved by:    hselasky (mentor), kib (mentor)
Sponsored by:   Mellanox Technologies
This commit is contained in:
Slava Shwartsman 2018-05-29 10:29:04 +00:00
parent c5712d6da1 810711ec13
commit ddeb4e8aa6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=334318
1 changed files with 8 additions and 1 deletions
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9
contrib/tcpdump/tcpdump.c
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@ -77,7 +77,6 @@ The Regents of the University of California. All rights reserved.\n";
*/
#ifdef HAVE_CAPSICUM
#include <sys/capsicum.h>
#include <sys/sysctl.h>
#include <sys/nv.h>
#include <sys/ioccom.h>
#include <net/bpf.h>
@ -114,6 +113,10 @@ The Regents of the University of California. All rights reserved.\n";
#endif /* HAVE_CAP_NG_H */
#endif /* HAVE_LIBCAP_NG */
#ifdef __FreeBSD__
#include <sys/sysctl.h>
#endif /* __FreeBSD__ */
#include "netdissect.h"
#include "interface.h"
#include "addrtoname.h"
@ -1095,6 +1098,10 @@ open_interface(const char *device, netdissect_options *ndo, char *ebuf)
sysctlbyname(sysctl, parent, &s, NULL, 0);
strlcpy(newdev, device, sizeof(newdev));
/* Suggest a new wlan device. */
/* FIXME: incrementing the index this way is not going to work well
* when the index is 9 or greater but the only consequence in this
* specific case would be an error message that looks a bit odd.
*/
newdev[strlen(newdev)-1]++;
error("%s is not a monitor mode VAP\n"
"To create a new monitor mode VAP use:\n"