o add support for multiple link types per interface (e.g. 802.11 and Ethernet)
o introduce BPF_TAP and BPF_MTAP macros to hide implementation details and ease code portability o use m_getcl where appropriate Reviewed by: many Approved by: re Obtained from: NetBSD (multiple link type support)
This commit is contained in:
Sam Leffler
parent
e1796d40b9
commit
24a229f466
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=106927
@ -204,19 +204,17 @@ bpf_movein(uio, linktype, mp, sockp, datlen)
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if ((unsigned)len > MCLBYTES)
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return (EIO);
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MGETHDR(m, M_TRYWAIT, MT_DATA);
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if (m == 0)
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return (ENOBUFS);
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if (len > MHLEN) {
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MCLGET(m, M_TRYWAIT);
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if ((m->m_flags & M_EXT) == 0) {
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error = ENOBUFS;
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goto bad;
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}
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m = m_getcl(M_TRYWAIT, MT_DATA, M_PKTHDR);
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} else {
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MGETHDR(m, M_TRYWAIT, MT_DATA);
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}
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if (m == NULL)
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return (ENOBUFS);
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m->m_pkthdr.len = m->m_len = len;
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m->m_pkthdr.rcvif = NULL;
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*mp = m;
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/*
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* Make room for link header.
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*/
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@ -235,7 +233,7 @@ bpf_movein(uio, linktype, mp, sockp, datlen)
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error = uiomove(mtod(m, caddr_t), len - hlen, uio);
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if (!error)
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return (0);
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bad:
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bad:
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m_freem(m);
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return (error);
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}
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@ -258,7 +256,7 @@ bpf_attachd(d, bp)
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d->bd_next = bp->bif_dlist;
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bp->bif_dlist = d;
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bp->bif_ifp->if_bpf = bp;
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*bp->bif_driverp = bp;
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BPFIF_UNLOCK(bp);
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}
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@ -304,7 +302,7 @@ bpf_detachd(d)
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/*
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* Let the driver know that there are no more listeners.
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*/
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d->bd_bif->bif_ifp->if_bpf = 0;
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*d->bd_bif->bif_driverp = 0;
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BPFIF_UNLOCK(bp);
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d->bd_bif = 0;
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}
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@ -969,6 +967,9 @@ bpf_setif(d, ifr)
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if (ifp == 0 || ifp != theywant)
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continue;
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/* skip additional entry */
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if (bp->bif_driverp != (struct bpf_if **)&ifp->if_bpf)
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continue;
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mtx_unlock(&bpf_mtx);
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/*
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@ -1058,16 +1059,14 @@ bpfpoll(dev, events, td)
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* buffer.
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*/
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void
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bpf_tap(ifp, pkt, pktlen)
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struct ifnet *ifp;
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bpf_tap(bp, pkt, pktlen)
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struct bpf_if *bp;
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register u_char *pkt;
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register u_int pktlen;
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{
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struct bpf_if *bp;
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register struct bpf_d *d;
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register u_int slen;
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bp = ifp->if_bpf;
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BPFIF_LOCK(bp);
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for (d = bp->bif_dlist; d != 0; d = d->bd_next) {
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BPFD_LOCK(d);
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@ -1075,7 +1074,7 @@ bpf_tap(ifp, pkt, pktlen)
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slen = bpf_filter(d->bd_filter, pkt, pktlen, pktlen);
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if (slen != 0) {
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#ifdef MAC
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if (mac_check_bpfdesc_receive(d, ifp) == 0)
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if (mac_check_bpfdesc_receive(d, bp->bif_ifp) == 0)
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#endif
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catchpacket(d, pkt, pktlen, slen, bcopy);
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}
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@ -1115,17 +1114,16 @@ bpf_mcopy(src_arg, dst_arg, len)
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* Incoming linkage from device drivers, when packet is in an mbuf chain.
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*/
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void
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bpf_mtap(ifp, m)
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struct ifnet *ifp;
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bpf_mtap(bp, m)
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struct bpf_if *bp;
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struct mbuf *m;
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{
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struct bpf_if *bp = ifp->if_bpf;
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struct bpf_d *d;
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u_int pktlen, slen;
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pktlen = m_length(m, NULL);
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if (pktlen == m->m_len) {
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bpf_tap(ifp, mtod(m, u_char *), pktlen);
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bpf_tap(bp, mtod(m, u_char *), pktlen);
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return;
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}
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@ -1138,7 +1136,7 @@ bpf_mtap(ifp, m)
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slen = bpf_filter(d->bd_filter, (u_char *)m, pktlen, 0);
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if (slen != 0)
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#ifdef MAC
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if (mac_check_bpfdesc_receive(d, ifp) == 0)
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if (mac_check_bpfdesc_receive(d, bp->bif_ifp) == 0)
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#endif
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catchpacket(d, (u_char *)m, pktlen, slen,
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bpf_mcopy);
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@ -1266,21 +1264,37 @@ bpf_freed(d)
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}
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/*
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* Attach an interface to bpf. ifp is a pointer to the structure
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* defining the interface to be attached, dlt is the link layer type,
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* and hdrlen is the fixed size of the link header (variable length
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* headers are not yet supporrted).
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* Attach an interface to bpf. dlt is the link layer type; hdrlen is the
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* fixed size of the link header (variable length headers not yet supported).
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*/
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void
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bpfattach(ifp, dlt, hdrlen)
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struct ifnet *ifp;
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u_int dlt, hdrlen;
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{
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bpfattach2(ifp, dlt, hdrlen, &ifp->if_bpf);
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}
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/*
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* Attach an interface to bpf. ifp is a pointer to the structure
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* defining the interface to be attached, dlt is the link layer type,
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* and hdrlen is the fixed size of the link header (variable length
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* headers are not yet supporrted).
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*/
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void
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bpfattach2(ifp, dlt, hdrlen, driverp)
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struct ifnet *ifp;
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u_int dlt, hdrlen;
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struct bpf_if **driverp;
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{
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struct bpf_if *bp;
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bp = (struct bpf_if *)malloc(sizeof(*bp), M_BPF, M_NOWAIT | M_ZERO);
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if (bp == 0)
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panic("bpfattach");
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bp->bif_dlist = 0;
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bp->bif_driverp = driverp;
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bp->bif_ifp = ifp;
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bp->bif_dlt = dlt;
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mtx_init(&bp->bif_mtx, "bpf interface lock", NULL, MTX_DEF);
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@ -1290,7 +1304,7 @@ bpfattach(ifp, dlt, hdrlen)
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bpf_iflist = bp;
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mtx_unlock(&bpf_mtx);
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bp->bif_ifp->if_bpf = 0;
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*bp->bif_driverp = 0;
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/*
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* Compute the length of the bpf header. This is not necessarily
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@ -1301,7 +1315,7 @@ bpfattach(ifp, dlt, hdrlen)
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bp->bif_hdrlen = BPF_WORDALIGN(hdrlen + SIZEOF_BPF_HDR) - hdrlen;
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if (bootverbose)
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printf("bpf: %s%d attached\n", ifp->if_name, ifp->if_unit);
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if_printf(ifp, "bpf attached\n");
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}
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/*
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@ -340,14 +340,25 @@ struct bpf_insn {
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#define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k }
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#ifdef _KERNEL
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struct bpf_if;
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int bpf_validate(const struct bpf_insn *, int);
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void bpf_tap(struct ifnet *, u_char *, u_int);
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void bpf_mtap(struct ifnet *, struct mbuf *);
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void bpf_tap(struct bpf_if *, u_char *, u_int);
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void bpf_mtap(struct bpf_if *, struct mbuf *);
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void bpfattach(struct ifnet *, u_int, u_int);
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void bpfattach2(struct ifnet *, u_int, u_int, struct bpf_if **);
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void bpfdetach(struct ifnet *);
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void bpfilterattach(int);
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u_int bpf_filter(const struct bpf_insn *, u_char *, u_int, u_int);
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#define BPF_TAP(_ifp,_pkt,_pktlen) do { \
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if ((_ifp)->if_bpf) \
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bpf_tap((_ifp)->if_bpf, (_pkt), (_pktlen)); \
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} while (0)
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#define BPF_MTAP(_ifp,_m) do { \
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if ((_ifp)->if_bpf) \
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bpf_mtap((_ifp)->if_bpf, (_m)); \
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} while (0)
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#endif
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/*
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@ -355,4 +366,4 @@ u_int bpf_filter(const struct bpf_insn *, u_char *, u_int, u_int);
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*/
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#define BPF_MEMWORDS 16
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#endif
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#endif /* _NET_BPF_H_ */
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@ -110,6 +110,7 @@ struct bpf_d {
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struct bpf_if {
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struct bpf_if *bif_next; /* list of all interfaces */
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struct bpf_d *bif_dlist; /* descriptor list */
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struct bpf_if **bif_driverp; /* pointer into softc */
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u_int bif_dlt; /* link layer type */
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u_int bif_hdrlen; /* length of header (with padding) */
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struct ifnet *bif_ifp; /* corresponding interface */
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