diff options
| -rw-r--r-- | sbin/ifconfig/ifconfig.8 | 11 | ||||
| -rw-r--r-- | sbin/ifconfig/ifconfig.c | 2 | ||||
| -rw-r--r-- | sys/net/if.h | 1 | ||||
| -rw-r--r-- | sys/net/if_ethersubr.c | 7 |
4 files changed, 21 insertions, 0 deletions
diff --git a/sbin/ifconfig/ifconfig.8 b/sbin/ifconfig/ifconfig.8 index 39761fb..57468e9 100644 --- a/sbin/ifconfig/ifconfig.8 +++ b/sbin/ifconfig/ifconfig.8 @@ -504,6 +504,17 @@ for more information. .It Fl link Op Cm 0 No - Cm 2 .Sm on Disable special processing at the link level with the specified interface. +.It Cm monitor +.Sm on +Put the interface in monitor mode. +No packets are transmitted and received packets are discarded after +.Xr bpf 4 +processing. +.Sm off +.It Fl monitor +.Sm on +Take the interface out of monitor mode. +.Sm off .It Cm up Mark an interface .Dq up . diff --git a/sbin/ifconfig/ifconfig.c b/sbin/ifconfig/ifconfig.c index c9ab382..35ac555 100644 --- a/sbin/ifconfig/ifconfig.c +++ b/sbin/ifconfig/ifconfig.c @@ -241,6 +241,8 @@ struct cmd { { "-link1", -IFF_LINK1, setifflags }, { "link2", IFF_LINK2, setifflags }, { "-link2", -IFF_LINK2, setifflags }, + { "monitor", IFF_MONITOR, setifflags }, + { "-monitor", -IFF_MONITOR, setifflags }, #ifdef USE_IF_MEDIA { "media", NEXTARG, setmedia }, { "mediaopt", NEXTARG, setmediaopt }, diff --git a/sys/net/if.h b/sys/net/if.h index a11dc39..a87dd47 100644 --- a/sys/net/if.h +++ b/sys/net/if.h @@ -141,6 +141,7 @@ struct if_data { #define IFF_MULTICAST 0x8000 /* supports multicast */ #define IFF_POLLING 0x10000 /* Interface is in polling mode. */ #define IFF_PPROMISC 0x20000 /* user-requested promisc mode */ +#define IFF_MONITOR 0x40000 /* user-requested monitor mode */ /* flags set internally only: */ #define IFF_CANTCHANGE \ 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 |
