diff options
| author | rwatson <rwatson@FreeBSD.org> | 2000-03-18 06:30:42 +0000 |
|---|---|---|
| committer | rwatson <rwatson@FreeBSD.org> | 2000-03-18 06:30:42 +0000 |
| commit | 7432002de6b5ecd51d01bb7e91819ee6347ea6f3 (patch) | |
| tree | ef6052ed707bd0c402ea6479889593ef5f2ce159 /sys/net/bpf.c | |
| parent | 5f00c83601ca3aad8d17dffa0fdc389fb61599d1 (diff) | |
| download | FreeBSD-src-7432002de6b5ecd51d01bb7e91819ee6347ea6f3.zip FreeBSD-src-7432002de6b5ecd51d01bb7e91819ee6347ea6f3.tar.gz | |
Introduce a new bd_seesent flag to the BPF descriptor, indicating whether or
not the current BPF device should report locally generated packets or not.
This allows sniffing applications to see only packets that are not generated
locally, which can be useful for debugging bridging problems, or other
situations where MAC addresses are not sufficient to identify locally
sourced packets. Default to true for this flag, so as to provide existing
behavior by default.
Introduce two new ioctls, BIOCGSEESENT and BIOCSSEESENT, which may be used
to manipulate this flag from userland, given appropriate privilege.
Modify bpf.4 to document these two new ioctl arguments.
Reviewed by: asmodai
Diffstat (limited to 'sys/net/bpf.c')
| -rw-r--r-- | sys/net/bpf.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/sys/net/bpf.c b/sys/net/bpf.c index d75013e..466227c 100644 --- a/sys/net/bpf.c +++ b/sys/net/bpf.c @@ -359,6 +359,7 @@ bpfopen(dev, flags, fmt, p) dev->si_drv1 = d; d->bd_bufsize = bpf_bufsize; d->bd_sig = SIGIO; + d->bd_seesent = 1; return (0); } @@ -633,6 +634,8 @@ reset_d(d) * BIOCVERSION Get filter language version. * BIOCGHDRCMPLT Get "header already complete" flag * BIOCSHDRCMPLT Set "header already complete" flag + * BIOCGSEESENT Get "see packets sent" flag + * BIOCSSEESENT Set "see packets sent" flag */ /* ARGSUSED */ static int @@ -848,6 +851,20 @@ bpfioctl(dev, cmd, addr, flags, p) d->bd_hdrcmplt = *(u_int *)addr ? 1 : 0; break; + /* + * Get "see sent packets" flag + */ + case BIOCGSEESENT: + *(u_int *)addr = d->bd_seesent; + break; + + /* + * Set "see sent packets" flag + */ + case BIOCSSEESENT: + d->bd_seesent = *(u_int *)addr; + break; + case FIONBIO: /* Non-blocking I/O */ break; @@ -1103,6 +1120,8 @@ bpf_mtap(ifp, m) pktlen += m0->m_len; for (d = bp->bif_dlist; d != 0; d = d->bd_next) { + if (!d->bd_seesent && (m->m_pkthdr.rcvif == NULL)) + continue; ++d->bd_rcount; slen = bpf_filter(d->bd_filter, (u_char *)m, pktlen, 0); if (slen != 0) |
