diff options
Diffstat (limited to 'sys/net/bpf.h')
| -rw-r--r-- | sys/net/bpf.h | 26 |
1 files changed, 22 insertions, 4 deletions
diff --git a/sys/net/bpf.h b/sys/net/bpf.h index 189b30f..b2868c2 100644 --- a/sys/net/bpf.h +++ b/sys/net/bpf.h @@ -603,7 +603,18 @@ struct bpf_dltlist { }; #ifdef _KERNEL -struct bpf_if; +/* + * Descriptor associated with each attached hardware interface. + */ +struct bpf_if { + LIST_ENTRY(bpf_if) bif_next; /* list of all interfaces */ + LIST_HEAD(, bpf_d) bif_dlist; /* descriptor list */ + u_int bif_dlt; /* link layer type */ + u_int bif_hdrlen; /* length of header (with padding) */ + struct ifnet *bif_ifp; /* corresponding interface */ + struct mtx bif_mtx; /* mutex for interface */ +}; + int bpf_validate(const struct bpf_insn *, int); void bpf_tap(struct bpf_if *, u_char *, u_int); void bpf_mtap(struct bpf_if *, struct mbuf *); @@ -615,18 +626,25 @@ void bpfdetach(struct ifnet *); void bpfilterattach(int); u_int bpf_filter(const struct bpf_insn *, u_char *, u_int, u_int); +static __inline int +bpf_peers_present(struct bpf_if *bpf) +{ + + return !LIST_EMPTY(&bpf->bif_dlist); +} + #define BPF_TAP(_ifp,_pkt,_pktlen) do { \ - if ((_ifp)->if_bpf) \ + if (bpf_peers_present((_ifp)->if_bpf)) \ bpf_tap((_ifp)->if_bpf, (_pkt), (_pktlen)); \ } while (0) #define BPF_MTAP(_ifp,_m) do { \ - if ((_ifp)->if_bpf) { \ + if (bpf_peers_present((_ifp)->if_bpf)) { \ M_ASSERTVALID(_m); \ bpf_mtap((_ifp)->if_bpf, (_m)); \ } \ } while (0) #define BPF_MTAP2(_ifp,_data,_dlen,_m) do { \ - if ((_ifp)->if_bpf) { \ + if (bpf_peers_present((_ifp)->if_bpf)) { \ M_ASSERTVALID(_m); \ bpf_mtap2((_ifp)->if_bpf,(_data),(_dlen),(_m)); \ } \ |
