diff options
| author | Dug Song <dugsong@cvs.openbsd.org> | 2001-05-28 19:51:07 +0000 |
|---|---|---|
| committer | Dug Song <dugsong@cvs.openbsd.org> | 2001-05-28 19:51:07 +0000 |
| commit | 003b06d76be118f7d0071a6b79dd42e11590fce2 (patch) | |
| tree | 617e45e542da0ade707be8ec2038535a5bcc214f /sys/net/if_ethersubr.c | |
| parent | 8448a6e5ece6a73c5a4ce842966a9c198f74284f (diff) | |
add BIOC[GS]HDRCMPLT ioctl for BPF, to disable overwriting of link level source address in forged frames. from NetBSD. art@ok
Diffstat (limited to 'sys/net/if_ethersubr.c')
| -rw-r--r-- | sys/net/if_ethersubr.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/sys/net/if_ethersubr.c b/sys/net/if_ethersubr.c index 348488dae7c..8e1357d2397 100644 --- a/sys/net/if_ethersubr.c +++ b/sys/net/if_ethersubr.c @@ -1,4 +1,4 @@ -/* $OpenBSD: if_ethersubr.c,v 1.44 2001/03/23 02:15:23 jason Exp $ */ +/* $OpenBSD: if_ethersubr.c,v 1.45 2001/05/28 19:51:06 dugsong Exp $ */ /* $NetBSD: if_ethersubr.c,v 1.19 1996/05/07 02:40:30 thorpej Exp $ */ /* @@ -245,8 +245,8 @@ ether_output(ifp, m0, dst, rt0) struct rtentry *rt0; { u_int16_t etype; - int s, error = 0; - u_char edst[6]; + int s, error = 0, hdrcmplt = 0; + u_char edst[6], esrc[6]; register struct mbuf *m = m0; register struct rtentry *rt; struct mbuf *mcopy = (struct mbuf *)0; @@ -478,6 +478,12 @@ ether_output(ifp, m0, dst, rt0) #endif /* LLC_DEBUG */ } break; + case pseudo_AF_HDRCMPLT: + hdrcmplt = 1; + eh = (struct ether_header *)dst->sa_data; + bcopy((caddr_t)eh->ether_shost, (caddr_t)esrc, sizeof (esrc)); + /* FALLTHROUGH */ + case AF_UNSPEC: eh = (struct ether_header *)dst->sa_data; bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); @@ -505,8 +511,12 @@ ether_output(ifp, m0, dst, rt0) bcopy((caddr_t)&etype,(caddr_t)&eh->ether_type, sizeof(eh->ether_type)); bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); - bcopy((caddr_t)ac->ac_enaddr, (caddr_t)eh->ether_shost, - sizeof(eh->ether_shost)); + if (hdrcmplt) + bcopy((caddr_t)esrc, (caddr_t)eh->ether_shost, + sizeof(eh->ether_shost)); + else + bcopy((caddr_t)ac->ac_enaddr, (caddr_t)eh->ether_shost, + sizeof(eh->ether_shost)); #if NBRIDGE > 0 /* |