diff options
Diffstat (limited to 'sys/net/if_fddisubr.c')
| -rw-r--r-- | sys/net/if_fddisubr.c | 42 |
1 files changed, 39 insertions, 3 deletions
diff --git a/sys/net/if_fddisubr.c b/sys/net/if_fddisubr.c index cf0caf7..5d00620 100644 --- a/sys/net/if_fddisubr.c +++ b/sys/net/if_fddisubr.c @@ -128,6 +128,8 @@ fddi_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); getmicrotime(&ifp->if_lastchange); @@ -324,9 +326,7 @@ bad: } /* - * Process a received FDDI packet; - * the packet is in the mbuf chain m without - * the fddi header, which is provided separately. + * Process a received FDDI packet. */ static void fddi_input(ifp, m) @@ -337,7 +337,30 @@ fddi_input(ifp, m) struct llc *l; struct fddi_header *fh; + /* + * Do consistency checks to verify assumptions + * made by code past this point. + */ + if ((m->m_flags & M_PKTHDR) == 0) { + if_printf(ifp, "discard frame w/o packet header\n"); + ifp->if_ierrors++; + m_freem(m); + return; + } + if (m->m_pkthdr.rcvif == NULL) { + if_printf(ifp, "discard frame w/o interface pointer\n"); + ifp->if_ierrors++; + m_freem(m); + return; + } + + m = m_pullup(m, FDDI_HDR_LEN); + if (m == NULL) { + ifp->if_ierrors++; + goto dropanyway; + } fh = mtod(m, struct fddi_header *); + m->m_pkthdr.header = (void *)fh; /* * Discard packet if interface is not up. @@ -345,6 +368,19 @@ fddi_input(ifp, m) if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) goto dropanyway; + /* + * Give bpf a chance at the packet. + */ + BPF_MTAP(ifp, m); + + /* + * Interface marked for monitoring; discard packet. + */ + if (ifp->if_flags & IFF_MONITOR) { + m_freem(m); + return; + } + #ifdef MAC mac_create_mbuf_from_ifnet(ifp, m); #endif |
