o add BIOCGDLTLIST and BIOCSDLT ioctls to get the data link type list
and set the link type for use by libpcap and tcpdump o move mtx unlock in bpfdetach up; it doesn't need to be held so long o change printf in bpf_detach to distinguish it from the same one in bpfsetdlt Note there are locking issues here related to ioctl processing; they have not been addressed here. Submitted by: Guy Harris <guy@alum.mit.edu> Obtained from: NetBSD (w/ locking modifications)
This commit is contained in:
Sam Leffler
parent
fff6d6f312
commit
8eab61f3de
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=109580
105
sys/net/bpf.c
105
sys/net/bpf.c
@ -109,6 +109,8 @@ static void catchpacket(struct bpf_d *, u_char *, u_int,
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u_int, void (*)(const void *, void *, size_t));
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static void reset_d(struct bpf_d *);
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static int bpf_setf(struct bpf_d *, struct bpf_program *);
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static int bpf_getdltlist(struct bpf_d *, struct bpf_dltlist *);
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static int bpf_setdlt(struct bpf_d *, u_int);
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static d_open_t bpfopen;
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static d_close_t bpfclose;
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@ -286,7 +288,8 @@ bpf_detachd(d)
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* the driver into promiscuous mode, but can't
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* take it out.
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*/
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if_printf(bp->bif_ifp, "ifpromisc failed %d\n", error);
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if_printf(bp->bif_ifp,
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"bpf_detach: ifpromisc failed (%d)\n", error);
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}
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}
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/* Remove d from the interface's descriptor list. */
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@ -736,7 +739,7 @@ bpfioctl(dev, cmd, addr, flags, td)
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break;
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/*
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* Get device parameters.
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* Get current data link type.
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*/
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case BIOCGDLT:
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if (d->bd_bif == 0)
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@ -745,6 +748,26 @@ bpfioctl(dev, cmd, addr, flags, td)
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*(u_int *)addr = d->bd_bif->bif_dlt;
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break;
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/*
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* Get a list of supported data link types.
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*/
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case BIOCGDLTLIST:
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if (d->bd_bif == 0)
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error = EINVAL;
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else
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error = bpf_getdltlist(d, (struct bpf_dltlist *)addr);
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break;
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/*
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* Set data link type.
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*/
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case BIOCSDLT:
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if (d->bd_bif == 0)
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error = EINVAL;
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else
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error = bpf_setdlt(d, *(u_int *)addr);
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break;
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/*
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* Get interface name.
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*/
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@ -1331,10 +1354,10 @@ bpfdetach(ifp)
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struct bpf_if *bp, *bp_prev;
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struct bpf_d *d;
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mtx_lock(&bpf_mtx);
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/* Locate BPF interface information */
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bp_prev = NULL;
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mtx_lock(&bpf_mtx);
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for (bp = bpf_iflist; bp != NULL; bp = bp->bif_next) {
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if (ifp == bp->bif_ifp)
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break;
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@ -1354,6 +1377,7 @@ bpfdetach(ifp)
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} else {
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bpf_iflist = bp->bif_next;
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}
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mtx_unlock(&bpf_mtx);
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while ((d = bp->bif_dlist) != NULL) {
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bpf_detachd(d);
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@ -1364,8 +1388,81 @@ bpfdetach(ifp)
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mtx_destroy(&bp->bif_mtx);
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free(bp, M_BPF);
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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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static int
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bpf_getdltlist(d, bfl)
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struct bpf_d *d;
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struct bpf_dltlist *bfl;
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{
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int n, error;
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struct ifnet *ifp;
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struct bpf_if *bp;
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ifp = d->bd_bif->bif_ifp;
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n = 0;
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error = 0;
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mtx_lock(&bpf_mtx);
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for (bp = bpf_iflist; bp != NULL; bp = bp->bif_next) {
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if (bp->bif_ifp != ifp)
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continue;
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if (bfl->bfl_list != NULL) {
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if (n >= bfl->bfl_len) {
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mtx_unlock(&bpf_mtx);
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return (ENOMEM);
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}
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error = copyout(&bp->bif_dlt,
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bfl->bfl_list + n, sizeof(u_int));
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}
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n++;
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}
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mtx_unlock(&bpf_mtx);
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bfl->bfl_len = n;
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return (error);
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}
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/*
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* Set the data link type of a BPF instance.
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*/
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static int
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bpf_setdlt(d, dlt)
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struct bpf_d *d;
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u_int dlt;
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{
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int error, opromisc;
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struct ifnet *ifp;
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struct bpf_if *bp;
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if (d->bd_bif->bif_dlt == dlt)
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return (0);
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ifp = d->bd_bif->bif_ifp;
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mtx_lock(&bpf_mtx);
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for (bp = bpf_iflist; bp != NULL; bp = bp->bif_next) {
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if (bp->bif_ifp == ifp && bp->bif_dlt == dlt)
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break;
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}
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mtx_unlock(&bpf_mtx);
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if (bp != NULL) {
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BPFD_LOCK(d);
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opromisc = d->bd_promisc;
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bpf_detachd(d);
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bpf_attachd(d, bp);
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reset_d(d);
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BPFD_UNLOCK(d);
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if (opromisc) {
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error = ifpromisc(bp->bif_ifp, 1);
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if (error)
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if_printf(bp->bif_ifp,
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"bpf_setdlt: ifpromisc failed (%d)\n",
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error);
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else
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d->bd_promisc = 1;
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}
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}
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return (bp == NULL ? EINVAL : 0);
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}
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static void bpf_drvinit(void *unused);
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@ -115,6 +115,8 @@ struct bpf_version {
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#define BIOCSHDRCMPLT _IOW('B',117, u_int)
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#define BIOCGSEESENT _IOR('B',118, u_int)
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#define BIOCSSEESENT _IOW('B',119, u_int)
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#define BIOCSDLT _IOW('B',120, u_int)
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#define BIOCGDLTLIST _IOWR('B',121, struct bpf_dltlist)
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/*
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* Structure prepended to each packet.
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@ -339,6 +341,14 @@ struct bpf_insn {
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#define BPF_STMT(code, k) { (u_short)(code), 0, 0, k }
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#define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k }
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/*
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* Structure to retrieve available DLTs for the interface.
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*/
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struct bpf_dltlist {
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u_int bfl_len; /* number of bfd_list array */
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u_int *bfl_list; /* array of DLTs */
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};
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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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