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bpf: Add IfAPI analogue for bpf_peers_present()
An interface's bpf could feasibly not exist, in which case bpf_peers_present() would panic from a NULL pointer dereference. Solve this by adding a new IfAPI that could deal with a NULL bpf, if such could occur in the network stack. Reviewed by: zlei Sponsored by: Juniper Networks, Inc. MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D42082
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@ -780,7 +780,7 @@ fwip_stream_input(struct fw_xferq *xferq)
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* Record the sender ID for possible BPF usage.
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*/
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src = ntohl(p[1]) >> 16;
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if (bpf_peers_present(if_getbpf(ifp))) {
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if (bpf_peers_present_if(ifp)) {
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mtag = m_tag_alloc(MTAG_FIREWIRE,
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MTAG_FIREWIRE_SENDER_EUID,
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2*sizeof(uint32_t), M_NOWAIT);
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@ -880,7 +880,7 @@ fwip_unicast_input(struct fw_xfer *xfer)
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goto done;
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}
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if (bpf_peers_present(if_getbpf(ifp))) {
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if (bpf_peers_present_if(ifp)) {
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/*
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* Record the sender ID for possible BPF usage.
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*/
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@ -3262,7 +3262,7 @@ hn_txpkt(if_t ifp, struct hn_tx_ring *txr, struct hn_txdesc *txd)
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int error, send_failed = 0, has_bpf;
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again:
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has_bpf = bpf_peers_present(if_getbpf(ifp));
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has_bpf = bpf_peers_present_if(ifp);
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if (has_bpf) {
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/*
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* Make sure that this txd and any aggregated txds are not
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@ -5972,7 +5972,7 @@ hn_transmit(if_t ifp, struct mbuf *m)
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omcast = (m->m_flags & M_MCAST) != 0;
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if (sc->hn_xvf_flags & HN_XVFFLAG_ACCBPF) {
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if (bpf_peers_present(if_getbpf(ifp))) {
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if (bpf_peers_present_if(ifp)) {
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m_bpf = m_copypacket(m, M_NOWAIT);
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if (m_bpf == NULL) {
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/*
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@ -1152,7 +1152,7 @@ my_rxeof(struct my_softc * sc)
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* broadcast packet, multicast packet, matches our ethernet
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* address or the interface is in promiscuous mode.
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*/
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if (bpf_peers_present(if_getbpf(ifp))) {
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if (bpf_peers_present_if(ifp)) {
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bpf_mtap_if(ifp, m);
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if (if_getflags(ifp) & IFF_PROMISC &&
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(bcmp(eh->ether_dhost, if_getlladdr(sc->my_ifp),
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@ -408,9 +408,7 @@ usbpf_xfertap(struct usb_xfer *xfer, int type)
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bus = xfer->xroot->bus;
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/* sanity checks */
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if (bus->ifp == NULL || if_getbpf(bus->ifp) == NULL)
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return;
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if (!bpf_peers_present(if_getbpf(bus->ifp)))
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if (bus->ifp == NULL || !bpf_peers_present_if(bus->ifp))
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return;
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totlen = usbpf_xfer_precompute_size(xfer, type);
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@ -2879,6 +2879,14 @@ bpfdetach(struct ifnet *ifp)
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BPF_UNLOCK();
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}
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bool
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bpf_peers_present_if(struct ifnet *ifp)
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{
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struct bpf_if *bp = ifp->if_bpf;
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return (bpf_peers_present(bp) > 0);
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}
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/*
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* Get a list of available data link type of the interface.
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*/
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@ -3162,6 +3170,12 @@ bpfdetach(struct ifnet *ifp)
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{
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}
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bool
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bpf_peers_present_if(struct ifnet *ifp)
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{
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return (false);
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}
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u_int
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bpf_filter(const struct bpf_insn *pc, u_char *p, u_int wirelen, u_int buflen)
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{
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@ -428,6 +428,7 @@ void bpf_mtap2_if(struct ifnet *, void *, u_int, 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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bool bpf_peers_present_if(struct ifnet *);
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#ifdef VIMAGE
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int bpf_get_bp_params(struct bpf_if *, u_int *, u_int *);
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#endif
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