diff options
| author | phk <phk@FreeBSD.org> | 2002-09-27 18:57:47 +0000 |
|---|---|---|
| committer | phk <phk@FreeBSD.org> | 2002-09-27 18:57:47 +0000 |
| commit | d61cac74b0dc667b645880b386219cacfb3c53f6 (patch) | |
| tree | 2e0b7f0095d2053a63219572fbeafde682841ff6 /sys/net/if_ethersubr.c | |
| parent | 834ddd1bcc092e4a26f16724892636b249316d70 (diff) | |
| download | FreeBSD-src-d61cac74b0dc667b645880b386219cacfb3c53f6.zip FreeBSD-src-d61cac74b0dc667b645880b386219cacfb3c53f6.tar.gz | |
Add the "Monitor" interface flag.
Setting this flag on an ethernet interface blocks transmission of packets
and discards incoming packets after BPF processing.
This is useful if you want to monitor network trafic but not interact
with the network in question.
Sponsored by: http://www.babeltech.dk
Diffstat (limited to 'sys/net/if_ethersubr.c')
| -rw-r--r-- | sys/net/if_ethersubr.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/sys/net/if_ethersubr.c b/sys/net/if_ethersubr.c index d92f405..0983724 100644 --- a/sys/net/if_ethersubr.c +++ b/sys/net/if_ethersubr.c @@ -162,6 +162,8 @@ ether_output(ifp, m, dst, rt0) senderr(error); #endif + if (ifp->if_flags & IFF_MONITOR) + senderr(ENETDOWN); if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) senderr(ENETDOWN); rt = rt0; @@ -583,6 +585,11 @@ ether_input(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m) bpf_mtap(ifp, (struct mbuf *)&mh); } + if (ifp->if_flags & IFF_MONITOR) { + m_freem(m); + return; + } + #ifdef MAC mac_create_mbuf_from_ifnet(ifp, m); #endif |
