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4622 4623 4624 4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 4635 4636 4637 4638 4639 4640 4641 4642 4643 4644 4645 4646 4647 4648 4649 4650 4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703 4704 4705 4706 4707 4708 4709 | /* * Copyright (c) 2000-2022 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * Copyright (c) 1990, 1991, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from the Stanford/CMU enet packet filter, * (net/enet.c) distributed as part of 4.3BSD, and code contributed * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence * Berkeley Laboratory. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)bpf.c 8.2 (Berkeley) 3/28/94 * * $FreeBSD: src/sys/net/bpf.c,v 1.59.2.5 2001/01/05 04:49:09 jdp Exp $ */ /* * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce * support for mandatory and extensible security protections. This notice * is included in support of clause 2.2 (b) of the Apple Public License, * Version 2.0. */ #include "bpf.h" #ifndef __GNUC__ #define inline #else #define inline __inline #endif #include <sys/param.h> #include <sys/systm.h> #include <sys/conf.h> #include <sys/malloc.h> #include <sys/mbuf.h> #include <sys/time.h> #include <sys/proc.h> #include <sys/signalvar.h> #include <sys/filio.h> #include <sys/sockio.h> #include <sys/ttycom.h> #include <sys/filedesc.h> #include <sys/uio_internal.h> #include <sys/file_internal.h> #include <sys/event.h> #include <sys/poll.h> #include <sys/socket.h> #include <sys/socketvar.h> #include <sys/vnode.h> #include <net/if.h> #include <net/bpf.h> #include <net/bpfdesc.h> #include <netinet/in.h> #include <netinet/ip.h> #include <netinet/ip6.h> #include <netinet/in_pcb.h> #include <netinet/in_var.h> #include <netinet/ip_var.h> #include <netinet/tcp.h> #include <netinet/tcp_var.h> #include <netinet/udp.h> #include <netinet/udp_var.h> #include <netinet/if_ether.h> #include <netinet/isakmp.h> #include <netinet6/esp.h> #include <sys/kernel.h> #include <sys/sysctl.h> #include <net/firewire.h> #include <miscfs/devfs/devfs.h> #include <net/dlil.h> #include <net/pktap.h> #include <kern/assert.h> #include <kern/locks.h> #include <kern/thread_call.h> #include <libkern/section_keywords.h> #include <os/log.h> #include <IOKit/IOBSD.h> #include <net/sockaddr_utils.h> extern int tvtohz(struct timeval *); extern const char *proc_name_address(void *); #define BPF_BUFSIZE 4096 #define PRINET 26 /* interruptible */ #define ISAKMP_HDR_SIZE (sizeof(struct isakmp) + sizeof(struct isakmp_gen)) #define ESP_HDR_SIZE sizeof(struct newesp) #define BPF_WRITE_LEEWAY 18 /* space for link layer header */ #define BPF_WRITE_MAX 0x1000000 /* 16 MB arbitrary value */ typedef void (*pktcopyfunc_t)(const void *, void *, size_t); /* * The default read buffer size is patchable. */ static unsigned int bpf_bufsize = BPF_BUFSIZE; SYSCTL_INT(_debug, OID_AUTO, bpf_bufsize, CTLFLAG_RW | CTLFLAG_LOCKED, &bpf_bufsize, 0, ""); __private_extern__ unsigned int bpf_maxbufsize = BPF_MAXBUFSIZE; static int sysctl_bpf_maxbufsize SYSCTL_HANDLER_ARGS; SYSCTL_PROC(_debug, OID_AUTO, bpf_maxbufsize, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &bpf_maxbufsize, 0, sysctl_bpf_maxbufsize, "I", "Default BPF max buffer size"); extern const int copysize_limit_panic; #define BPF_BUFSIZE_CAP (copysize_limit_panic >> 1) static int sysctl_bpf_bufsize_cap SYSCTL_HANDLER_ARGS; SYSCTL_PROC(_debug, OID_AUTO, bpf_bufsize_cap, CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_LOCKED, 0, 0, sysctl_bpf_bufsize_cap, "I", "Upper limit on BPF max buffer size"); #define BPF_MAX_DEVICES 256 static unsigned int bpf_maxdevices = BPF_MAX_DEVICES; SYSCTL_UINT(_debug, OID_AUTO, bpf_maxdevices, CTLFLAG_RD | CTLFLAG_LOCKED, &bpf_maxdevices, 0, ""); /* * bpf_wantpktap controls the defaul visibility of DLT_PKTAP * For OS X is off by default so process need to use the ioctl BPF_WANT_PKTAP * explicitly to be able to use DLT_PKTAP. */ #if !XNU_TARGET_OS_OSX static unsigned int bpf_wantpktap = 1; #else /* XNU_TARGET_OS_OSX */ static unsigned int bpf_wantpktap = 0; #endif /* XNU_TARGET_OS_OSX */ SYSCTL_UINT(_debug, OID_AUTO, bpf_wantpktap, CTLFLAG_RW | CTLFLAG_LOCKED, &bpf_wantpktap, 0, ""); static int bpf_debug = 0; SYSCTL_INT(_debug, OID_AUTO, bpf_debug, CTLFLAG_RW | CTLFLAG_LOCKED, &bpf_debug, 0, ""); static unsigned long bpf_trunc_overflow = 0; SYSCTL_ULONG(_debug, OID_AUTO, bpf_trunc_overflow, CTLFLAG_RD | CTLFLAG_LOCKED, &bpf_trunc_overflow, ""); static int bpf_hdr_comp_enable = 1; SYSCTL_INT(_debug, OID_AUTO, bpf_hdr_comp_enable, CTLFLAG_RW | CTLFLAG_LOCKED, &bpf_hdr_comp_enable, 1, ""); static int sysctl_bpf_stats SYSCTL_HANDLER_ARGS; SYSCTL_PROC(_debug, OID_AUTO, bpf_stats, CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED, 0, 0, sysctl_bpf_stats, "S", "BPF statistics"); /* * bpf_iflist is the list of interfaces; each corresponds to an ifnet * bpf_dtab holds pointer to the descriptors, indexed by minor device # */ static struct bpf_if *bpf_iflist; /* * BSD now stores the bpf_d in the dev_t which is a struct * on their system. Our dev_t is an int, so we still store * the bpf_d in a separate table indexed by minor device #. * * The value stored in bpf_dtab[n] represent three states: * NULL: device not opened * BPF_DEV_RESERVED: device opening or closing * other: device <n> opened with pointer to storage */ static struct bpf_d *BPF_DEV_RESERVED = __unsafe_forge_single(struct bpf_d *, 1); static unsigned int bpf_dtab_size = 0; static struct bpf_d **__counted_by(bpf_dtab_size) bpf_dtab = NULL; static unsigned int nbpfilter = 0; static unsigned bpf_bpfd_cnt = 0; static LCK_GRP_DECLARE(bpf_mlock_grp, "bpf"); static LCK_MTX_DECLARE(bpf_mlock_data, &bpf_mlock_grp); static lck_mtx_t *const bpf_mlock = &bpf_mlock_data; static int bpf_allocbufs(struct bpf_d *); static errno_t bpf_attachd(struct bpf_d *d, struct bpf_if *bp); static int bpf_detachd(struct bpf_d *d, struct proc *); static void bpf_freed(struct bpf_d *); static int bpf_setif(struct bpf_d *, ifnet_t ifp, bool, bool, bool, struct proc *); static void bpf_timed_out(void *, void *); static void bpf_wakeup(struct bpf_d *); static uint32_t get_pkt_trunc_len(struct bpf_packet *); static void catchpacket(struct bpf_d *, struct bpf_packet *, u_int, int); static void reset_d(struct bpf_d *); static int bpf_setf(struct bpf_d *, u_int, user_addr_t, u_long); static int bpf_getdltlist(struct bpf_d *, caddr_t __bidi_indexable, struct proc *); static int bpf_setdlt(struct bpf_d *, u_int, struct proc *); static int bpf_set_traffic_class(struct bpf_d *, int); static void bpf_set_packet_service_class(struct mbuf *, int); static void bpf_acquire_d(struct bpf_d *); static void bpf_release_d(struct bpf_d *); static int bpf_devsw_installed; void bpf_init(void *unused); static int bpf_tap_callback(struct ifnet *ifp, struct mbuf *m); /* * Darwin differs from BSD here, the following are static * on BSD and not static on Darwin. */ d_open_t bpfopen; d_close_t bpfclose; d_read_t bpfread; d_write_t bpfwrite; ioctl_fcn_t bpfioctl; select_fcn_t bpfselect; /* Darwin's cdevsw struct differs slightly from BSDs */ #define CDEV_MAJOR 23 static const struct cdevsw bpf_cdevsw = { .d_open = bpfopen, .d_close = bpfclose, .d_read = bpfread, .d_write = bpfwrite, .d_ioctl = bpfioctl, .d_stop = eno_stop, .d_reset = eno_reset, .d_ttys = NULL, .d_select = bpfselect, .d_mmap = eno_mmap, .d_strategy = eno_strat, .d_reserved_1 = eno_getc, .d_reserved_2 = eno_putc, .d_type = 0 }; #define SOCKADDR_HDR_LEN offsetof(struct sockaddr, sa_data) static int bpf_copy_uio_to_mbuf_packet(struct uio *auio, int bytes_to_copy, struct mbuf *top) { int error = 0; for (struct mbuf *m = top; m != NULL; m = m->m_next) { int mlen; if (m->m_flags & M_EXT) { mlen = m->m_ext.ext_size - (int)M_LEADINGSPACE(m); } else if (m->m_flags & M_PKTHDR) { mlen = MHLEN - (int)M_LEADINGSPACE(m); } else { mlen = MLEN - (int)M_LEADINGSPACE(m); } int copy_len = imin((int)mlen, bytes_to_copy); error = uiomove(mtod(m, caddr_t), (int)copy_len, auio); if (error != 0) { os_log(OS_LOG_DEFAULT, "bpf_copy_uio_to_mbuf_packet: len %d error %d", copy_len, error); goto done; } m->m_len = copy_len; top->m_pkthdr.len += copy_len; if (bytes_to_copy > copy_len) { bytes_to_copy -= copy_len; } else { break; } } done: return error; } static inline void bpf_set_bcast_mcast(mbuf_t m, struct ether_header * eh) { if (ETHER_IS_MULTICAST(eh->ether_dhost)) { if (_ether_cmp(etherbroadcastaddr, eh->ether_dhost) == 0) { m->m_flags |= M_BCAST; } else { m->m_flags |= M_MCAST; } } } #if DEBUG | DEVELOPMENT static void bpf_log_bcast(const char * func, const char * ifname, uint16_t flags, bool hdrcmplt) { const char * type; if ((flags & M_BCAST) != 0) { type = "broadcast"; } else if ((flags & M_MCAST) != 0) { type = "multicast"; } else { type = "unicast"; } os_log(OS_LOG_DEFAULT, "%s %s %s hdrcmplt=%s", func, ifname, type, hdrcmplt ? "true" : "false"); } #endif /* DEBUG | DEVELOPMENT */ static int bpf_movein(struct uio *uio, int copy_len, struct bpf_d *d, struct mbuf **mp, struct sockaddr *sockp) { mbuf_ref_t m = NULL; int error; int len; uint8_t sa_family; int hlen = 0; struct ifnet *ifp = d->bd_bif->bif_ifp; int linktype = (int)d->bd_bif->bif_dlt; switch (linktype) { #if SLIP case DLT_SLIP: sa_family = AF_INET; hlen = 0; break; #endif /* SLIP */ case DLT_EN10MB: sa_family = AF_UNSPEC; /* XXX Would MAXLINKHDR be better? */ hlen = sizeof(struct ether_header); break; #if FDDI case DLT_FDDI: #if defined(__FreeBSD__) || defined(__bsdi__) sa_family = AF_IMPLINK; hlen = 0; #else sa_family = AF_UNSPEC; /* XXX 4(FORMAC)+6(dst)+6(src)+3(LLC)+5(SNAP) */ hlen = 24; #endif break; #endif /* FDDI */ case DLT_RAW: case DLT_NULL: sa_family = AF_UNSPEC; hlen = 0; break; #ifdef __FreeBSD__ case DLT_ATM_RFC1483: /* * en atm driver requires 4-byte atm pseudo header. * though it isn't standard, vpi:vci needs to be * specified anyway. */ sa_family = AF_UNSPEC; hlen = 12; /* XXX 4(ATM_PH) + 3(LLC) + 5(SNAP) */ break; #endif case DLT_PPP: sa_family = AF_UNSPEC; hlen = 4; /* This should match PPP_HDRLEN */ break; case DLT_APPLE_IP_OVER_IEEE1394: sa_family = AF_UNSPEC; hlen = sizeof(struct firewire_header); break; case DLT_IEEE802_11: /* IEEE 802.11 wireless */ sa_family = AF_IEEE80211; hlen = 0; break; case DLT_IEEE802_11_RADIO: sa_family = AF_IEEE80211; hlen = 0; break; default: return EIO; } if (sockp) { /* * Build a sockaddr based on the data link layer type. * We do this at this level because the ethernet header * is copied directly into the data field of the sockaddr. * In the case of SLIP, there is no header and the packet * is forwarded as is. * Also, we are careful to leave room at the front of the mbuf * for the link level header. */ if ((hlen + SOCKADDR_HDR_LEN) > sockp->sa_len) { return EIO; } sockp->sa_family = sa_family; } else { /* * We're directly sending the packet data supplied by * the user; we don't need to make room for the link * header, and don't need the header length value any * more, so set it to 0. */ hlen = 0; } len = (int)uio_resid(uio); if (len < copy_len) { os_log(OS_LOG_DEFAULT, "bpfwrite: len %d if %s less than copy_len %d", (unsigned)len, ifp->if_xname, copy_len); return EMSGSIZE; } len = copy_len; if (len < hlen || (unsigned)len > BPF_WRITE_MAX) { os_log(OS_LOG_DEFAULT, "bpfwrite: bad len %d if %s", (unsigned)len, ifp->if_xname); return EMSGSIZE; } if (d->bd_write_size_max != 0) { if ((len - hlen) > (d->bd_write_size_max + BPF_WRITE_LEEWAY)) { os_log(OS_LOG_DEFAULT, "bpfwrite: len %u - hlen %u too big if %s write_size_max %u", (unsigned)len, (unsigned)hlen, ifp->if_xname, d->bd_write_size_max); } } else if ((len - hlen) > (ifp->if_mtu + BPF_WRITE_LEEWAY)) { os_log(OS_LOG_DEFAULT, "bpfwrite: len %u - hlen %u too big if %s mtu %u", (unsigned)len, (unsigned)hlen, ifp->if_xname, ifp->if_mtu); return EMSGSIZE; } /* drop lock while allocating mbuf and copying data */ lck_mtx_unlock(bpf_mlock); error = mbuf_allocpacket(MBUF_WAITOK, len, NULL, &m); if (error != 0) { os_log(OS_LOG_DEFAULT, "bpfwrite mbuf_allocpacket len %d error %d", len, error); goto bad; } /* * Make room for link header -- the packet length is 0 at this stage */ if (hlen != 0) { m->m_data += hlen; /* leading space */ error = uiomove((caddr_t)sockp->sa_data, hlen, uio); if (error) { os_log(OS_LOG_DEFAULT, "bpfwrite uiomove hlen %d error %d", hlen, error); goto bad; } len -= hlen; if (linktype == DLT_EN10MB) { struct ether_header * eh; eh = (struct ether_header *)(void *)sockp->sa_data; bpf_set_bcast_mcast(m, eh); #if DEBUG || DEVELOPMENT if (__improbable(bpf_debug != 0)) { bpf_log_bcast(__func__, ifp->if_xname, m->m_flags, false); } #endif /* DEBUG || DEVELOPMENT */ } } /* * bpf_copy_uio_to_mbuf_packet() does set the length of each mbuf and adds it to * the total packet length */ error = bpf_copy_uio_to_mbuf_packet(uio, len, m); if (error != 0) { os_log(OS_LOG_DEFAULT, "bpfwrite bpf_copy_uio_to_mbuf_packet error %d", error); goto bad; } /* Check for multicast destination */ if (hlen == 0 && linktype == DLT_EN10MB) { struct ether_header *eh; eh = mtod(m, struct ether_header *); bpf_set_bcast_mcast(m, eh); #if DEBUG || DEVELOPMENT if (__improbable(bpf_debug != 0)) { bpf_log_bcast(__func__, ifp->if_xname, m->m_flags, true); } #endif /* DEBUG || DEVELOPMENT */ } *mp = m; lck_mtx_lock(bpf_mlock); return 0; bad: if (m != NULL) { m_freem(m); } lck_mtx_lock(bpf_mlock); return error; } static int bpf_movein_batch(struct uio *uio, struct bpf_d *d, struct mbuf **mp, struct sockaddr *sockp) { int error = 0; user_ssize_t resid; int count = 0; struct mbuf *last = NULL; *mp = NULL; while ((resid = uio_resid(uio)) >= sizeof(struct bpf_hdr)) { struct bpf_hdr bpfhdr = {}; int bpf_hdr_min_len = offsetof(struct bpf_hdr, bh_hdrlen) + sizeof(bpfhdr.bh_hdrlen); int padding_len; error = uiomove((caddr_t)&bpfhdr, bpf_hdr_min_len, uio); if (error != 0) { os_log(OS_LOG_DEFAULT, "bpf_movein_batch uiomove error %d", error); break; } /* * Buffer validation: * - ignore bh_tstamp * - bh_hdrlen must fit * - bh_caplen and bh_datalen must be equal */ if (bpfhdr.bh_hdrlen < bpf_hdr_min_len) { error = EINVAL; os_log(OS_LOG_DEFAULT, "bpf_movein_batch bh_hdrlen %u too small", bpfhdr.bh_hdrlen); break; } if (bpfhdr.bh_caplen != bpfhdr.bh_datalen) { error = EINVAL; os_log(OS_LOG_DEFAULT, "bpf_movein_batch bh_caplen %u != bh_datalen %u", bpfhdr.bh_caplen, bpfhdr.bh_datalen); break; } if (bpfhdr.bh_hdrlen > resid) { error = EINVAL; os_log(OS_LOG_DEFAULT, "bpf_movein_batch bh_hdrlen %u too large", bpfhdr.bh_hdrlen); break; } /* * Ignore additional bytes in the header */ padding_len = bpfhdr.bh_hdrlen - bpf_hdr_min_len; if (padding_len > 0) { uio_update(uio, padding_len); } /* skip empty packets */ if (bpfhdr.bh_caplen > 0) { mbuf_ref_t m; /* * For time being assume all packets have same destination */ error = bpf_movein(uio, bpfhdr.bh_caplen, d, &m, sockp); if (error != 0) { os_log(OS_LOG_DEFAULT, "bpf_movein_batch bpf_movein error %d", error); break; } count += 1; if (last == NULL) { *mp = m; } else { last->m_nextpkt = m; } last = m; } /* * Each BPF packet is padded for alignment */ padding_len = BPF_WORDALIGN(bpfhdr.bh_hdrlen + bpfhdr.bh_caplen) - (bpfhdr.bh_hdrlen + bpfhdr.bh_caplen); if (padding_len > 0) { uio_update(uio, padding_len); } } if (error != 0) { if (*mp != NULL) { m_freem_list(*mp); *mp = NULL; } } return error; } /* * The dynamic addition of a new device node must block all processes that * are opening the last device so that no process will get an unexpected * ENOENT */ static void bpf_make_dev_t(int maj) { static int bpf_growing = 0; unsigned int cur_size = nbpfilter, i; if (nbpfilter >= BPF_MAX_DEVICES) { return; } while (bpf_growing) { /* Wait until new device has been created */ (void) tsleep((caddr_t)&bpf_growing, PZERO, "bpf_growing", 0); } if (nbpfilter > cur_size) { /* other thread grew it already */ return; } bpf_growing = 1; /* need to grow bpf_dtab first */ if (nbpfilter == bpf_dtab_size) { unsigned int new_dtab_size; struct bpf_d **new_dtab = NULL; new_dtab_size = bpf_dtab_size + NBPFILTER; new_dtab = krealloc_type(struct bpf_d *, bpf_dtab_size, new_dtab_size, bpf_dtab, Z_WAITOK | Z_ZERO); if (new_dtab == 0) { os_log_error(OS_LOG_DEFAULT, "bpf_make_dev_t: malloc bpf_dtab failed"); goto done; } bpf_dtab = new_dtab; bpf_dtab_size = new_dtab_size; } i = nbpfilter++; (void) devfs_make_node(makedev(maj, i), DEVFS_CHAR, UID_ROOT, GID_WHEEL, 0600, "bpf%d", i); done: bpf_growing = 0; wakeup((caddr_t)&bpf_growing); } /* * Attach file to the bpf interface, i.e. make d listen on bp. */ static errno_t bpf_attachd(struct bpf_d *d, struct bpf_if *bp) { int first = bp->bif_dlist == NULL; int error = 0; /* * Point d at bp, and add d to the interface's list of listeners. * Finally, point the driver's bpf cookie at the interface so * it will divert packets to bpf. */ d->bd_bif = bp; d->bd_next = bp->bif_dlist; bp->bif_dlist = d; bpf_bpfd_cnt++; /* * Take a reference on the device even if an error is returned * because we keep the device in the interface's list of listeners */ bpf_acquire_d(d); if (first) { /* Find the default bpf entry for this ifp */ if (bp->bif_ifp->if_bpf == NULL) { struct bpf_if *tmp, *primary = NULL; for (tmp = bpf_iflist; tmp; tmp = tmp->bif_next) { if (tmp->bif_ifp == bp->bif_ifp) { primary = tmp; break; } } bp->bif_ifp->if_bpf = primary; } /* Only call dlil_set_bpf_tap for primary dlt */ if (bp->bif_ifp->if_bpf == bp) { dlil_set_bpf_tap(bp->bif_ifp, BPF_TAP_INPUT_OUTPUT, bpf_tap_callback); } if (bp->bif_tap != NULL) { error = bp->bif_tap(bp->bif_ifp, bp->bif_dlt, BPF_TAP_INPUT_OUTPUT); } } /* * Reset the detach flags in case we previously detached an interface */ d->bd_flags &= ~(BPF_DETACHING | BPF_DETACHED); if (bp->bif_dlt == DLT_PKTAP) { d->bd_flags |= BPF_FINALIZE_PKTAP; } else { d->bd_flags &= ~BPF_FINALIZE_PKTAP; } return error; } /* * Detach a file from its interface. * * Return 1 if was closed by some thread, 0 otherwise */ static int bpf_detachd(struct bpf_d *d, struct proc *proc) { struct bpf_d **p; struct bpf_if *bp; struct ifnet *ifp; uint32_t dlt; bpf_tap_func disable_tap; uint8_t bd_promisc; int bpf_closed = d->bd_flags & BPF_CLOSING; /* * Some other thread already detached */ if ((d->bd_flags & (BPF_DETACHED | BPF_DETACHING)) != 0) { goto done; } /* * This thread is doing the detach */ d->bd_flags |= BPF_DETACHING; ifp = d->bd_bif->bif_ifp; bp = d->bd_bif; /* Remove d from the interface's descriptor list. */ p = &bp->bif_dlist; while (*p != d) { p = &(*p)->bd_next; if (*p == 0) { panic("bpf_detachd: descriptor not in list"); } } *p = (*p)->bd_next; bpf_bpfd_cnt--; disable_tap = NULL; if (bp->bif_dlist == 0) { /* * Let the driver know that there are no more listeners. */ /* Only call dlil_set_bpf_tap for primary dlt */ if (bp->bif_ifp->if_bpf == bp) { dlil_set_bpf_tap(ifp, BPF_TAP_DISABLE, NULL); } disable_tap = bp->bif_tap; if (disable_tap) { dlt = bp->bif_dlt; } for (bp = bpf_iflist; bp; bp = bp->bif_next) { if (bp->bif_ifp == ifp && bp->bif_dlist != 0) { break; } } if (bp == NULL) { ifp->if_bpf = NULL; } } d->bd_bif = NULL; /* * Stop disabling input */ if ((d->bd_flags & BPF_DIVERT_IN) != 0) { if_clear_xflags(ifp, IFXF_DISABLE_INPUT); d->bd_flags &= ~BPF_DIVERT_IN; os_log(OS_LOG_DEFAULT, "bpf_detachd: bpf%d %s disable input 0", d->bd_dev_minor, if_name(ifp)); } /* * Check if this descriptor had requested promiscuous mode. * If so, turn it off. */ bd_promisc = d->bd_promisc; d->bd_promisc = 0; lck_mtx_unlock(bpf_mlock); if (bd_promisc) { if (ifnet_set_promiscuous(ifp, 0)) { /* * Something is really wrong if we were able to put * the driver into promiscuous mode, but can't * take it out. * Most likely the network interface is gone. */ os_log_error(OS_LOG_DEFAULT, "%s: bpf%d ifnet_set_promiscuous %s failed", __func__, d->bd_dev_minor, if_name(ifp)); } } if (disable_tap) { disable_tap(ifp, dlt, BPF_TAP_DISABLE); } lck_mtx_lock(bpf_mlock); /* * Wake up other thread that are waiting for this thread to finish * detaching */ d->bd_flags &= ~BPF_DETACHING; d->bd_flags |= BPF_DETACHED; /* Refresh the local variable as d could have been modified */ bpf_closed = d->bd_flags & BPF_CLOSING; os_log(OS_LOG_DEFAULT, "bpf%d%s detached from %s fcount %llu dcount %llu by %s:%u", d->bd_dev_minor, bpf_closed ? " closed and" : "", if_name(ifp), d->bd_fcount, d->bd_dcount, proc_name_address(proc), proc_pid(proc)); /* * Note that We've kept the reference because we may have dropped * the lock when turning off promiscuous mode */ bpf_release_d(d); done: /* * Let the caller know the bpf_d is closed */ if (bpf_closed) { return 1; } else { return 0; } } /* * Start asynchronous timer, if necessary. * Must be called with bpf_mlock held. */ static void bpf_start_timer(struct bpf_d *d) { uint64_t deadline; struct timeval tv; if (d->bd_rtout > 0 && d->bd_state == BPF_IDLE) { tv.tv_sec = d->bd_rtout / hz; tv.tv_usec = (d->bd_rtout % hz) * tick; clock_interval_to_deadline( (uint32_t)tv.tv_sec * USEC_PER_SEC + tv.tv_usec, NSEC_PER_USEC, &deadline); /* * The state is BPF_IDLE, so the timer hasn't * been started yet, and hasn't gone off yet; * there is no thread call scheduled, so this * won't change the schedule. * * XXX - what if, by the time it gets entered, * the deadline has already passed? */ thread_call_enter_delayed(d->bd_thread_call, deadline); d->bd_state = BPF_WAITING; } } /* * Cancel asynchronous timer. * Must be called with bpf_mlock held. */ static boolean_t bpf_stop_timer(struct bpf_d *d) { /* * If the timer has already gone off, this does nothing. * Our caller is expected to set d->bd_state to BPF_IDLE, * with the bpf_mlock, after we are called. bpf_timed_out() * also grabs bpf_mlock, so, if the timer has gone off and * bpf_timed_out() hasn't finished, it's waiting for the * lock; when this thread releases the lock, it will * find the state is BPF_IDLE, and just release the * lock and return. */ return thread_call_cancel(d->bd_thread_call); } void bpf_acquire_d(struct bpf_d *d) { void *__single lr_saved = __unsafe_forge_single(void *, __builtin_return_address(0)); LCK_MTX_ASSERT(bpf_mlock, LCK_MTX_ASSERT_OWNED); d->bd_refcnt += 1; d->bd_ref_lr[d->bd_next_ref_lr] = lr_saved; d->bd_next_ref_lr = (d->bd_next_ref_lr + 1) % BPF_REF_HIST; } void bpf_release_d(struct bpf_d *d) { void *__single lr_saved = __unsafe_forge_single(void *, __builtin_return_address(0)); LCK_MTX_ASSERT(bpf_mlock, LCK_MTX_ASSERT_OWNED); if (d->bd_refcnt <= 0) { panic("%s: %p refcnt <= 0", __func__, d); } d->bd_refcnt -= 1; d->bd_unref_lr[d->bd_next_unref_lr] = lr_saved; d->bd_next_unref_lr = (d->bd_next_unref_lr + 1) % BPF_REF_HIST; if (d->bd_refcnt == 0) { /* Assert the device is detached */ if ((d->bd_flags & BPF_DETACHED) == 0) { panic("%s: %p BPF_DETACHED not set", __func__, d); } kfree_type(struct bpf_d, d); } } /* * Open ethernet device. Returns ENXIO for illegal minor device number, * EBUSY if file is open by another process. */ /* ARGSUSED */ int bpfopen(dev_t dev, int flags, __unused int fmt, struct proc *proc) { struct bpf_d *d; lck_mtx_lock(bpf_mlock); if ((unsigned int) minor(dev) >= nbpfilter) { lck_mtx_unlock(bpf_mlock); return ENXIO; } /* * New device nodes are created on demand when opening the last one. * The programming model is for processes to loop on the minor starting * at 0 as long as EBUSY is returned. The loop stops when either the * open succeeds or an error other that EBUSY is returned. That means * that bpf_make_dev_t() must block all processes that are opening the * last node. If not all processes are blocked, they could unexpectedly * get ENOENT and abort their opening loop. */ if ((unsigned int) minor(dev) == (nbpfilter - 1)) { bpf_make_dev_t(major(dev)); } /* * Each minor can be opened by only one process. If the requested * minor is in use, return EBUSY. * * Important: bpfopen() and bpfclose() have to check and set the status * of a device in the same lockin context otherwise the device may be * leaked because the vnode use count will be unpextectly greater than 1 * when close() is called. */ if (bpf_dtab[minor(dev)] == NULL) { /* Reserve while opening */ bpf_dtab[minor(dev)] = BPF_DEV_RESERVED; } else { lck_mtx_unlock(bpf_mlock); return EBUSY; } d = kalloc_type(struct bpf_d, Z_WAITOK | Z_ZERO); if (d == NULL) { /* this really is a catastrophic failure */ os_log_error(OS_LOG_DEFAULT, "bpfopen: bpf%d kalloc_type bpf_d failed", minor(dev)); bpf_dtab[minor(dev)] = NULL; lck_mtx_unlock(bpf_mlock); return ENOMEM; } /* Mark "in use" and do most initialization. */ bpf_acquire_d(d); d->bd_bufsize = bpf_bufsize; d->bd_sig = SIGIO; d->bd_direction = BPF_D_INOUT; d->bd_oflags = flags; d->bd_state = BPF_IDLE; d->bd_traffic_class = SO_TC_BE; d->bd_flags |= BPF_DETACHED; if (bpf_wantpktap) { d->bd_flags |= BPF_WANT_PKTAP; } else { d->bd_flags &= ~BPF_WANT_PKTAP; } d->bd_thread_call = thread_call_allocate(bpf_timed_out, d); if (d->bd_thread_call == NULL) { os_log_error(OS_LOG_DEFAULT, "bpfopen: bpf%d malloc thread call failed", minor(dev)); bpf_dtab[minor(dev)] = NULL; bpf_release_d(d); lck_mtx_unlock(bpf_mlock); return ENOMEM; } /* Use the proc pointer for comparaison so no need to take a reference */ d->bd_opened_by = proc; uuid_generate(d->bd_uuid); d->bd_pid = proc_pid(proc); d->bd_dev_minor = minor(dev); bpf_dtab[minor(dev)] = d; /* Mark opened */ lck_mtx_unlock(bpf_mlock); if (bpf_debug) { os_log(OS_LOG_DEFAULT, "bpf%u opened by %s.%u", d->bd_dev_minor, proc_name_address(proc), d->bd_pid); } return 0; } /* * Close the descriptor by detaching it from its interface, * deallocating its buffers, and marking it free. */ /* ARGSUSED */ int bpfclose(dev_t dev, __unused int flags, __unused int fmt, struct proc *proc) { struct bpf_d *d; /* Take BPF lock to ensure no other thread is using the device */ lck_mtx_lock(bpf_mlock); d = bpf_dtab[minor(dev)]; if (d == NULL || d == BPF_DEV_RESERVED) { lck_mtx_unlock(bpf_mlock); return ENXIO; } /* * Other threads may call bpd_detachd() if we drop the bpf_mlock */ d->bd_flags |= BPF_CLOSING; if (bpf_debug != 0) { os_log(OS_LOG_DEFAULT, "%s: bpf%d", __func__, d->bd_dev_minor); } bpf_dtab[minor(dev)] = BPF_DEV_RESERVED; /* Reserve while closing */ /* * Deal with any in-progress timeouts. */ switch (d->bd_state) { case BPF_IDLE: /* * Not waiting for a timeout, and no timeout happened. */ break; case BPF_WAITING: /* * Waiting for a timeout. * Cancel any timer that has yet to go off, * and mark the state as "closing". * Then drop the lock to allow any timers that * *have* gone off to run to completion, and wait * for them to finish. */ if (!bpf_stop_timer(d)) { /* * There was no pending call, so the call must * have been in progress. Wait for the call to * complete; we have to drop the lock while * waiting. to let the in-progrss call complete */ d->bd_state = BPF_DRAINING; while (d->bd_state == BPF_DRAINING) { msleep((caddr_t)d, bpf_mlock, PRINET, "bpfdraining", NULL); } } d->bd_state = BPF_IDLE; break; case BPF_TIMED_OUT: /* * Timer went off, and the timeout routine finished. */ d->bd_state = BPF_IDLE; break; case BPF_DRAINING: /* * Another thread is blocked on a close waiting for * a timeout to finish. * This "shouldn't happen", as the first thread to enter * bpfclose() will set bpf_dtab[minor(dev)] to 1, and * all subsequent threads should see that and fail with * ENXIO. */ panic("Two threads blocked in a BPF close"); break; } if (d->bd_bif) { bpf_detachd(d, proc); } selthreadclear(&d->bd_sel); thread_call_free(d->bd_thread_call); while (d->bd_hbuf_read || d->bd_hbuf_write) { msleep((caddr_t)d, bpf_mlock, PRINET, "bpfclose", NULL); } if (bpf_debug) { os_log(OS_LOG_DEFAULT, "bpf%u closed by %s.%u dcount %llu fcount %llu ccount %llu", d->bd_dev_minor, proc_name_address(proc), proc_pid(proc), d->bd_dcount, d->bd_fcount, d->bd_bcs.bcs_count_compressed_prefix); } bpf_freed(d); /* Mark free in same context as bpfopen comes to check */ bpf_dtab[minor(dev)] = NULL; /* Mark closed */ bpf_release_d(d); lck_mtx_unlock(bpf_mlock); return 0; } #define BPF_SLEEP bpf_sleep static int bpf_sleep(struct bpf_d *d, int pri, const char *wmesg, int timo) { u_int64_t abstime = 0; if (timo != 0) { clock_interval_to_deadline(timo, NSEC_PER_SEC / hz, &abstime); } return msleep1((caddr_t)d, bpf_mlock, pri, wmesg, abstime); } static void bpf_finalize_pktap(struct bpf_hdr *hp, struct pktap_header *pktaphdr) { if (pktaphdr->pth_flags & PTH_FLAG_V2_HDR) { struct pktap_v2_hdr *pktap_v2_hdr; pktap_v2_hdr = (struct pktap_v2_hdr *)pktaphdr; if (pktap_v2_hdr->pth_flags & PTH_FLAG_DELAY_PKTAP) { pktap_v2_finalize_proc_info(pktap_v2_hdr); } } else { if (pktaphdr->pth_flags & PTH_FLAG_DELAY_PKTAP) { pktap_finalize_proc_info(pktaphdr); } if (pktaphdr->pth_flags & PTH_FLAG_TSTAMP) { hp->bh_tstamp.tv_sec = pktaphdr->pth_tstamp.tv_sec; hp->bh_tstamp.tv_usec = pktaphdr->pth_tstamp.tv_usec; } } } /* * Rotate the packet buffers in descriptor d. Move the store buffer * into the hold slot, and the free buffer into the store slot. * Zero the length of the new store buffer. * * Note: in head drop mode, the hold buffer can be dropped so the fist packet of the * store buffer cannot be compressed as it otherwise would refer to deleted data * in a dropped hold buffer that the reader process does know about */ #define ROTATE_BUFFERS(d) do { \ if (d->bd_hbuf_read) \ panic("rotating bpf buffers during read"); \ (d)->bd_hbuf = (d)->bd_sbuf; \ (d)->bd_hlen = (d)->bd_slen; \ (d)->bd_hcnt = (d)->bd_scnt; \ (d)->bd_sbuf = (d)->bd_fbuf; \ (d)->bd_slen = 0; \ (d)->bd_scnt = 0; \ (d)->bd_fbuf = NULL; \ if ((d)->bd_headdrop != 0) \ (d)->bd_prev_slen = 0; \ } while(false) /* * bpfread - read next chunk of packets from buffers */ int bpfread(dev_t dev, struct uio *uio, int ioflag) { struct bpf_d *d; caddr_t hbuf; int timed_out, hbuf_len; int error; int flags; lck_mtx_lock(bpf_mlock); d = bpf_dtab[minor(dev)]; if (d == NULL || d == BPF_DEV_RESERVED || (d->bd_flags & BPF_CLOSING) != 0) { lck_mtx_unlock(bpf_mlock); return ENXIO; } bpf_acquire_d(d); /* * Restrict application to use a buffer the same size as * as kernel buffers. */ if (uio_resid(uio) != d->bd_bufsize) { bpf_release_d(d); lck_mtx_unlock(bpf_mlock); return EINVAL; } if (d->bd_state == BPF_WAITING) { bpf_stop_timer(d); } timed_out = (d->bd_state == BPF_TIMED_OUT); d->bd_state = BPF_IDLE; while (d->bd_hbuf_read) { msleep((caddr_t)d, bpf_mlock, PRINET, "bpfread", NULL); } if ((d->bd_flags & BPF_CLOSING) != 0) { bpf_release_d(d); lck_mtx_unlock(bpf_mlock); return ENXIO; } /* * If the hold buffer is empty, then do a timed sleep, which * ends when the timeout expires or when enough packets * have arrived to fill the store buffer. */ while (d->bd_hbuf == 0) { if ((d->bd_immediate || timed_out || (ioflag & IO_NDELAY)) && d->bd_slen != 0) { /* * We're in immediate mode, or are reading * in non-blocking mode, or a timer was * started before the read (e.g., by select() * or poll()) and has expired and a packet(s) * either arrived since the previous * read or arrived while we were asleep. * Rotate the buffers and return what's here. */ ROTATE_BUFFERS(d); break; } /* * No data is available, check to see if the bpf device * is still pointed at a real interface. If not, return * ENXIO so that the userland process knows to rebind * it before using it again. */ if (d->bd_bif == NULL) { bpf_release_d(d); lck_mtx_unlock(bpf_mlock); return ENXIO; } if (ioflag & IO_NDELAY) { bpf_release_d(d); lck_mtx_unlock(bpf_mlock); return EWOULDBLOCK; } error = BPF_SLEEP(d, PRINET | PCATCH, "bpf", d->bd_rtout); /* * Make sure device is still opened */ if ((d->bd_flags & BPF_CLOSING) != 0) { bpf_release_d(d); lck_mtx_unlock(bpf_mlock); return ENXIO; } while (d->bd_hbuf_read) { msleep((caddr_t)d, bpf_mlock, PRINET, "bpf_read", NULL); } if ((d->bd_flags & BPF_CLOSING) != 0) { bpf_release_d(d); lck_mtx_unlock(bpf_mlock); return ENXIO; } if (error == EINTR || error == ERESTART) { if (d->bd_hbuf != NULL) { /* * Because we msleep, the hold buffer might * be filled when we wake up. Avoid rotating * in this case. */ break; } if (d->bd_slen != 0) { /* * Sometimes we may be interrupted often and * the sleep above will not timeout. * Regardless, we should rotate the buffers * if there's any new data pending and * return it. */ ROTATE_BUFFERS(d); break; } bpf_release_d(d); lck_mtx_unlock(bpf_mlock); if (error == ERESTART) { os_log(OS_LOG_DEFAULT, "%s: bpf%d ERESTART to EINTR", __func__, d->bd_dev_minor); error = EINTR; } return error; } if (error == EWOULDBLOCK) { /* * On a timeout, return what's in the buffer, * which may be nothing. If there is something * in the store buffer, we can rotate the buffers. */ if (d->bd_hbuf) { /* * We filled up the buffer in between * getting the timeout and arriving * here, so we don't need to rotate. */ break; } if (d->bd_slen == 0) { bpf_release_d(d); lck_mtx_unlock(bpf_mlock); return 0; } ROTATE_BUFFERS(d); break; } } /* * At this point, we know we have something in the hold slot. */ /* * Set the hold buffer read. So we do not * rotate the buffers until the hold buffer * read is complete. Also to avoid issues resulting * from page faults during disk sleep (<rdar://problem/13436396>). */ d->bd_hbuf_read = true; hbuf = d->bd_hbuf; hbuf_len = d->bd_hlen; flags = d->bd_flags; d->bd_bcs.bcs_total_read += d->bd_hcnt; lck_mtx_unlock(bpf_mlock); /* * Before we move data to userland, we fill out the extended * header fields. */ if (flags & BPF_EXTENDED_HDR) { char *p; p = hbuf; while (p < hbuf + hbuf_len) { struct bpf_hdr_ext *ehp; uint32_t flowid; struct so_procinfo soprocinfo; int found = 0; ehp = (struct bpf_hdr_ext *)(void *)p; if ((flowid = ehp->bh_flowid) != 0) { if (ehp->bh_flags & BPF_HDR_EXT_FLAGS_TCP) { ehp->bh_flags &= ~BPF_HDR_EXT_FLAGS_TCP; found = inp_findinpcb_procinfo(&tcbinfo, flowid, &soprocinfo); } else if (ehp->bh_flags == BPF_HDR_EXT_FLAGS_UDP) { ehp->bh_flags &= ~BPF_HDR_EXT_FLAGS_UDP; found = inp_findinpcb_procinfo(&udbinfo, flowid, &soprocinfo); } if (found == 1) { ehp->bh_pid = soprocinfo.spi_pid; strbufcpy(ehp->bh_comm, soprocinfo.spi_proc_name); } ehp->bh_flowid = 0; } if ((flags & BPF_FINALIZE_PKTAP) != 0 && ehp->bh_complen == 0) { struct pktap_header *pktaphdr; pktaphdr = (struct pktap_header *)(void *) (p + BPF_WORDALIGN(ehp->bh_hdrlen)); bpf_finalize_pktap((struct bpf_hdr *) ehp, pktaphdr); } p += BPF_WORDALIGN(ehp->bh_hdrlen + ehp->bh_caplen); } } else if (flags & BPF_FINALIZE_PKTAP) { char *p; p = hbuf; while (p < hbuf + hbuf_len) { struct bpf_hdr *hp; struct pktap_header *pktaphdr; hp = (struct bpf_hdr *)(void *)p; /* * Cannot finalize a compressed pktap header as we may not have * all the fields present */ if (d->bd_flags & BPF_COMP_ENABLED) { struct bpf_comp_hdr *hcp; hcp = (struct bpf_comp_hdr *)(void *)p; if (hcp->bh_complen != 0) { p += BPF_WORDALIGN(hcp->bh_hdrlen + hcp->bh_caplen); continue; } } pktaphdr = (struct pktap_header *)(void *) (p + BPF_WORDALIGN(hp->bh_hdrlen)); bpf_finalize_pktap(hp, pktaphdr); p += BPF_WORDALIGN(hp->bh_hdrlen + hp->bh_caplen); } } /* * Move data from hold buffer into user space. * We know the entire buffer is transferred since * we checked above that the read buffer is bpf_bufsize bytes. */ error = uiomove(hbuf, hbuf_len, uio); lck_mtx_lock(bpf_mlock); /* * Make sure device is still opened */ if ((d->bd_flags & BPF_CLOSING) != 0) { bpf_release_d(d); lck_mtx_unlock(bpf_mlock); return ENXIO; } d->bd_hbuf_read = false; d->bd_fbuf = d->bd_hbuf; d->bd_hbuf = NULL; d->bd_hlen = 0; d->bd_hcnt = 0; wakeup((caddr_t)d); bpf_release_d(d); lck_mtx_unlock(bpf_mlock); return error; } /* * If there are processes sleeping on this descriptor, wake them up. */ static void bpf_wakeup(struct bpf_d *d) { if (d->bd_state == BPF_WAITING) { bpf_stop_timer(d); d->bd_state = BPF_IDLE; } wakeup((caddr_t)d); if (d->bd_async && d->bd_sig && d->bd_sigio) { pgsigio(d->bd_sigio, d->bd_sig); } selwakeup(&d->bd_sel); if ((d->bd_flags & BPF_KNOTE)) { KNOTE(&d->bd_sel.si_note, 1); } } static void bpf_timed_out(void *arg, __unused void *dummy) { struct bpf_d *d = (struct bpf_d *)arg; lck_mtx_lock(bpf_mlock); if (d->bd_state == BPF_WAITING) { /* * There's a select or kqueue waiting for this; if there's * now stuff to read, wake it up. */ d->bd_state = BPF_TIMED_OUT; if (d->bd_slen != 0) { bpf_wakeup(d); } } else if (d->bd_state == BPF_DRAINING) { /* * A close is waiting for this to finish. * Mark it as finished, and wake the close up. */ d->bd_state = BPF_IDLE; bpf_wakeup(d); } lck_mtx_unlock(bpf_mlock); } /* keep in sync with bpf_movein above: */ #define MAX_DATALINK_HDR_LEN (sizeof(struct firewire_header)) int bpfwrite(dev_t dev, struct uio *uio, __unused int ioflag) { struct bpf_d *d; struct ifnet *ifp; mbuf_ref_t m = NULL; int error = 0; char dst_buf[SOCKADDR_HDR_LEN + MAX_DATALINK_HDR_LEN] = {}; int bif_dlt; int bd_hdrcmplt; bpf_send_func bif_send; lck_mtx_lock(bpf_mlock); while (true) { d = bpf_dtab[minor(dev)]; if (d == NULL || d == BPF_DEV_RESERVED || (d->bd_flags & BPF_CLOSING) != 0) { lck_mtx_unlock(bpf_mlock); return ENXIO; } if (d->bd_hbuf_write) { msleep((caddr_t)d, bpf_mlock, PRINET, "bpfwrite", NULL); } else { break; } } d->bd_hbuf_write = true; bpf_acquire_d(d); ++d->bd_wcount; if (d->bd_bif == NULL) { error = ENXIO; goto done; } ifp = d->bd_bif->bif_ifp; if (IFNET_IS_MANAGEMENT(ifp) && IOCurrentTaskHasEntitlement(MANAGEMENT_DATA_ENTITLEMENT) == false) { ++d->bd_wdcount; bpf_release_d(d); lck_mtx_unlock(bpf_mlock); return ENETDOWN; } if ((ifp->if_flags & IFF_UP) == 0) { error = ENETDOWN; goto done; } int resid = (int)uio_resid(uio); if (resid <= 0) { error = resid == 0 ? 0 : EINVAL; os_log(OS_LOG_DEFAULT, "bpfwrite: resid %d error %d", resid, error); goto done; } SA(dst_buf)->sa_len = sizeof(dst_buf); /* * geting variables onto stack before dropping the lock */ bif_dlt = (int)d->bd_bif->bif_dlt; bd_hdrcmplt = d->bd_hdrcmplt; bool batch_write = (d->bd_flags & BPF_BATCH_WRITE) ? true : false; if (batch_write) { error = bpf_movein_batch(uio, d, &m, bd_hdrcmplt ? NULL : SA(dst_buf)); if (error != 0) { goto done; } } else { error = bpf_movein(uio, resid, d, &m, bd_hdrcmplt ? NULL : SA(dst_buf)); if (error != 0) { goto done; } bpf_set_packet_service_class(m, d->bd_traffic_class); } /* verify the device is still open */ if ((d->bd_flags & BPF_CLOSING) != 0) { error = ENXIO; goto done; } if (d->bd_bif == NULL || d->bd_bif->bif_ifp != ifp) { error = ENXIO; goto done; } bif_send = d->bd_bif->bif_send; lck_mtx_unlock(bpf_mlock); if (bd_hdrcmplt) { if (bif_send) { /* * Send one packet at a time, the driver frees the mbuf * but we need to take care of the leftover */ while (m != NULL && error == 0) { struct mbuf *next = m->m_nextpkt; m->m_nextpkt = NULL; error = bif_send(ifp, bif_dlt, m); m = next; } } else { error = dlil_output(ifp, 0, m, NULL, NULL, DLIL_OUTPUT_FLAGS_RAW, NULL); /* Make sure we do not double free */ m = NULL; } } else { error = dlil_output(ifp, PF_INET, m, NULL, SA(dst_buf), DLIL_OUTPUT_FLAGS_NONE, NULL); /* Make sure we do not double free */ m = NULL; } lck_mtx_lock(bpf_mlock); done: if (error != 0 && m != NULL) { ++d->bd_wdcount; } if (m != NULL) { m_freem_list(m); } d->bd_hbuf_write = false; wakeup((caddr_t)d); bpf_release_d(d); lck_mtx_unlock(bpf_mlock); return error; } /* * Reset a descriptor by flushing its packet buffer and clearing the * receive and drop counts. */ static void reset_d(struct bpf_d *d) { if (d->bd_hbuf_read) { panic("resetting buffers during read"); } if (d->bd_hbuf) { /* Free the hold buffer. */ d->bd_fbuf = d->bd_hbuf; d->bd_hbuf = NULL; } d->bd_slen = 0; d->bd_hlen = 0; d->bd_scnt = 0; d->bd_hcnt = 0; d->bd_rcount = 0; d->bd_dcount = 0; d->bd_fcount = 0; d->bd_wcount = 0; d->bd_wdcount = 0; d->bd_prev_slen = 0; } static struct bpf_d * bpf_get_device_from_uuid(uuid_t uuid) { unsigned int i; for (i = 0; i < nbpfilter; i++) { struct bpf_d *d = bpf_dtab[i]; if (d == NULL || d == BPF_DEV_RESERVED || (d->bd_flags & BPF_CLOSING) != 0) { continue; } if (uuid_compare(uuid, d->bd_uuid) == 0) { return d; } } return NULL; } /* * The BIOCSETUP command "atomically" attach to the interface and * copy the buffer from another interface. This minimizes the risk * of missing packet because this is done while holding * the BPF global lock */ static int bpf_setup(struct bpf_d *d_to, uuid_t uuid_from, ifnet_t ifp, struct proc *proc) { struct bpf_d *d_from; int error = 0; LCK_MTX_ASSERT(bpf_mlock, LCK_MTX_ASSERT_OWNED); /* * Sanity checks */ d_from = bpf_get_device_from_uuid(uuid_from); if (d_from == NULL) { error = ENOENT; os_log_error(OS_LOG_DEFAULT, "%s: uuids not found error %d", __func__, error); return error; } if (d_from->bd_opened_by != d_to->bd_opened_by) { error = EACCES; os_log_error(OS_LOG_DEFAULT, "%s: processes not matching error %d", __func__, error); return error; } /* * Prevent any read or write while copying */ while (d_to->bd_hbuf_read || d_to->bd_hbuf_write) { msleep((caddr_t)d_to, bpf_mlock, PRINET, __func__, NULL); } d_to->bd_hbuf_read = true; d_to->bd_hbuf_write = true; while (d_from->bd_hbuf_read || d_from->bd_hbuf_write) { msleep((caddr_t)d_from, bpf_mlock, PRINET, __func__, NULL); } d_from->bd_hbuf_read = true; d_from->bd_hbuf_write = true; /* * Verify the devices have not been closed */ if (d_to->bd_flags & BPF_CLOSING) { error = ENXIO; os_log_error(OS_LOG_DEFAULT, "%s: d_to is closing error %d", __func__, error); goto done; } if (d_from->bd_flags & BPF_CLOSING) { error = ENXIO; os_log_error(OS_LOG_DEFAULT, "%s: d_from is closing error %d", __func__, error); goto done; } /* * For now require the same buffer size */ if (d_from->bd_bufsize != d_to->bd_bufsize) { error = EINVAL; os_log_error(OS_LOG_DEFAULT, "%s: bufsizes not matching error %d", __func__, error); goto done; } /* * Copy relevant options and flags */ d_to->bd_flags = d_from->bd_flags & (BPF_EXTENDED_HDR | BPF_WANT_PKTAP | BPF_FINALIZE_PKTAP | BPF_TRUNCATE | BPF_PKTHDRV2 | BPF_COMP_REQ | BPF_COMP_ENABLED); d_to->bd_headdrop = d_from->bd_headdrop; /* * Allocate and copy the buffers */ error = bpf_allocbufs(d_to); if (error != 0) { goto done; } /* * Make sure the buffers are setup as expected by bpf_setif() */ ASSERT(d_to->bd_hbuf == NULL); ASSERT(d_to->bd_sbuf != NULL); ASSERT(d_to->bd_fbuf != NULL); /* * Copy the buffers and update the pointers and counts */ memcpy(d_to->bd_sbuf, d_from->bd_sbuf, d_from->bd_slen); d_to->bd_slen = d_from->bd_slen; d_to->bd_scnt = d_from->bd_scnt; if (d_from->bd_hbuf != NULL) { d_to->bd_hbuf = d_to->bd_fbuf; d_to->bd_fbuf = NULL; memcpy(d_to->bd_hbuf, d_from->bd_hbuf, d_from->bd_hlen); } d_to->bd_hlen = d_from->bd_hlen; d_to->bd_hcnt = d_from->bd_hcnt; if (d_to->bd_flags & BPF_COMP_REQ) { ASSERT(d_to->bd_prev_sbuf != NULL); ASSERT(d_to->bd_prev_fbuf != NULL); d_to->bd_prev_slen = d_from->bd_prev_slen; ASSERT(d_to->bd_prev_slen <= BPF_HDR_COMP_LEN_MAX); memcpy(d_to->bd_prev_sbuf, d_from->bd_prev_sbuf, BPF_HDR_COMP_LEN_MAX); } d_to->bd_bcs = d_from->bd_bcs; /* * Attach to the interface: * - don't reset the buffers * - we already prevent reads and writes * - the buffers are already allocated */ error = bpf_setif(d_to, ifp, false, true, true, proc); if (error != 0) { os_log_error(OS_LOG_DEFAULT, "%s: bpf_setif() failed error %d", __func__, error); goto done; } done: d_from->bd_hbuf_read = false; d_from->bd_hbuf_write = false; wakeup((caddr_t)d_from); d_to->bd_hbuf_read = false; d_to->bd_hbuf_write = false; wakeup((caddr_t)d_to); return error; } #if DEVELOPMENT || DEBUG #define BPF_IOC_LIST \ X(FIONREAD) \ X(SIOCGIFADDR) \ X(BIOCGBLEN) \ X(BIOCSBLEN) \ X(BIOCSETF32) \ X(BIOCSETFNR32) \ X(BIOCSETF64) \ X(BIOCSETFNR64) \ X(BIOCFLUSH) \ X(BIOCPROMISC) \ X(BIOCGDLT) \ X(BIOCGDLTLIST) \ X(BIOCSDLT) \ X(BIOCGETIF) \ X(BIOCSETIF) \ X(BIOCSRTIMEOUT32) \ X(BIOCSRTIMEOUT64) \ X(BIOCGRTIMEOUT32) \ X(BIOCGRTIMEOUT64) \ X(BIOCGSTATS) \ X(BIOCIMMEDIATE) \ X(BIOCVERSION) \ X(BIOCGHDRCMPLT) \ X(BIOCSHDRCMPLT) \ X(BIOCGSEESENT) \ X(BIOCSSEESENT) \ X(BIOCSETTC) \ X(BIOCGETTC) \ X(FIONBIO) \ X(FIOASYNC) \ X(BIOCSRSIG) \ X(BIOCGRSIG) \ X(BIOCSEXTHDR) \ X(BIOCGIFATTACHCOUNT) \ X(BIOCGWANTPKTAP) \ X(BIOCSWANTPKTAP) \ X(BIOCSHEADDROP) \ X(BIOCGHEADDROP) \ X(BIOCSTRUNCATE) \ X(BIOCGETUUID) \ X(BIOCSETUP) \ X(BIOCSPKTHDRV2) \ X(BIOCGHDRCOMP) \ X(BIOCSHDRCOMP) \ X(BIOCGHDRCOMPSTATS) \ X(BIOCGHDRCOMPON) \ X(BIOCGDIRECTION) \ X(BIOCSDIRECTION) \ X(BIOCSWRITEMAX) \ X(BIOCGWRITEMAX) \ X(BIOCGBATCHWRITE) \ X(BIOCSBATCHWRITE) \ X(BIOCGNOTSTAMP) \ X(BIOCSNOTSTAMP) static void log_bpf_ioctl_str(struct bpf_d *d, u_long cmd, int error) { const char *p = NULL; char str[32]; #define X(x) case x: { p = #x ; printf("%s\n", p); break; } switch (cmd) { BPF_IOC_LIST } #undef X if (p == NULL) { snprintf(str, sizeof(str), "0x%08x", (unsigned int)cmd); p = str; } os_log(OS_LOG_DEFAULT, "bpfioctl bpf%u %s error: %d", d->bd_dev_minor, p, error); } #endif /* DEVELOPMENT || DEBUG */ /* * FIONREAD Check for read packet available. * SIOCGIFADDR Get interface address - convenient hook to driver. * BIOCGBLEN Get buffer len [for read()]. * BIOCSETF Set ethernet read filter. * BIOCFLUSH Flush read packet buffer. * BIOCPROMISC Put interface into promiscuous mode. * BIOCGDLT Get link layer type. * BIOCGETIF Get interface name. * BIOCSETIF Set interface. * BIOCSRTIMEOUT Set read timeout. * BIOCGRTIMEOUT Get read timeout. * BIOCGSTATS Get packet stats. * BIOCIMMEDIATE Set immediate mode. * BIOCVERSION Get filter language version. * BIOCGHDRCMPLT Get "header already complete" flag * BIOCSHDRCMPLT Set "header already complete" flag * BIOCGSEESENT Get "see packets sent" flag * BIOCSSEESENT Set "see packets sent" flag * BIOCSETTC Set traffic class. * BIOCGETTC Get traffic class. * BIOCSEXTHDR Set "extended header" flag * BIOCSHEADDROP Drop head of the buffer if user is not reading * BIOCGHEADDROP Get "head-drop" flag */ /* ARGSUSED */ int bpfioctl(dev_t dev, u_long cmd, caddr_t __sized_by(IOCPARM_LEN(cmd)) addr, __unused int flags, struct proc *proc) { struct bpf_d *d; int error = 0; u_int int_arg; struct ifreq ifr = {}; lck_mtx_lock(bpf_mlock); d = bpf_dtab[minor(dev)]; if (d == NULL || d == BPF_DEV_RESERVED || (d->bd_flags & BPF_CLOSING) != 0) { lck_mtx_unlock(bpf_mlock); return ENXIO; } bpf_acquire_d(d); if (d->bd_state == BPF_WAITING) { bpf_stop_timer(d); } d->bd_state = BPF_IDLE; switch (cmd) { default: error = EINVAL; break; /* * Check for read packet available. */ case FIONREAD: { /* int */ int n; n = d->bd_slen; if (d->bd_hbuf && d->bd_hbuf_read) { n += d->bd_hlen; } bcopy(&n, addr, sizeof(n)); break; } case SIOCGIFADDR: { /* struct ifreq */ struct ifnet *ifp; if (d->bd_bif == 0) { error = EINVAL; } else { ifp = d->bd_bif->bif_ifp; error = ifnet_ioctl(ifp, 0, cmd, addr); } break; } /* * Get buffer len [for read()]. */ case BIOCGBLEN: { /* u_int */ static_assert(sizeof(d->bd_bufsize) == sizeof(u_int)); bcopy(&d->bd_bufsize, addr, sizeof(u_int)); break; } /* * Set buffer length. */ case BIOCSBLEN: { /* u_int */ u_int size; if (d->bd_bif != 0 || (d->bd_flags & BPF_DETACHING)) { /* * Interface already attached, unable to change buffers */ error = EINVAL; break; } bcopy(addr, &size, sizeof(size)); if (size > BPF_BUFSIZE_CAP) { d->bd_bufsize = BPF_BUFSIZE_CAP; os_log_info(OS_LOG_DEFAULT, "bpf%d BIOCSBLEN capped to %u from %u", minor(dev), d->bd_bufsize, size); } else if (size < BPF_MINBUFSIZE) { d->bd_bufsize = BPF_MINBUFSIZE; os_log_info(OS_LOG_DEFAULT, "bpf%d BIOCSBLEN bumped to %u from %u", minor(dev), d->bd_bufsize, size); } else { d->bd_bufsize = size; os_log_info(OS_LOG_DEFAULT, "bpf%d BIOCSBLEN %u", minor(dev), d->bd_bufsize); } /* It's a read/write ioctl */ bcopy(&d->bd_bufsize, addr, sizeof(u_int)); break; } /* * Set link layer read filter. */ case BIOCSETF32: case BIOCSETFNR32: { /* struct bpf_program32 */ struct bpf_program32 prg32; bcopy(addr, &prg32, sizeof(prg32)); error = bpf_setf(d, prg32.bf_len, CAST_USER_ADDR_T(prg32.bf_insns), cmd); break; } case BIOCSETF64: case BIOCSETFNR64: { /* struct bpf_program64 */ struct bpf_program64 prg64; bcopy(addr, &prg64, sizeof(prg64)); error = bpf_setf(d, prg64.bf_len, CAST_USER_ADDR_T(prg64.bf_insns), cmd); break; } /* * Flush read packet buffer. */ case BIOCFLUSH: while (d->bd_hbuf_read) { msleep((caddr_t)d, bpf_mlock, PRINET, "BIOCFLUSH", NULL); } if ((d->bd_flags & BPF_CLOSING) != 0) { error = ENXIO; break; } reset_d(d); break; /* * Put interface into promiscuous mode. */ case BIOCPROMISC: if (d->bd_bif == 0) { /* * No interface attached yet. */ error = EINVAL; break; } if (d->bd_promisc == 0) { lck_mtx_unlock(bpf_mlock); error = ifnet_set_promiscuous(d->bd_bif->bif_ifp, 1); lck_mtx_lock(bpf_mlock); if (error == 0) { d->bd_promisc = 1; } } break; /* * Get device parameters. */ case BIOCGDLT: { /* u_int */ if (d->bd_bif == 0) { error = EINVAL; } else { static_assert(sizeof(d->bd_bif->bif_dlt) == sizeof(u_int)); bcopy(&d->bd_bif->bif_dlt, addr, sizeof(u_int)); } break; } /* * Get a list of supported data link types. */ case BIOCGDLTLIST: /* struct bpf_dltlist */ if (d->bd_bif == NULL) { error = EINVAL; } else { error = bpf_getdltlist(d, addr, proc); } break; /* * Set data link type. */ case BIOCSDLT: /* u_int */ if (d->bd_bif == NULL) { error = EINVAL; } else { u_int dlt; bcopy(addr, &dlt, sizeof(dlt)); if (dlt == DLT_PKTAP && !(d->bd_flags & BPF_WANT_PKTAP)) { dlt = DLT_RAW; } error = bpf_setdlt(d, dlt, proc); } break; /* * Get interface name. */ case BIOCGETIF: /* struct ifreq */ if (d->bd_bif == 0) { error = EINVAL; } else { struct ifnet *const ifp = d->bd_bif->bif_ifp; snprintf(((struct ifreq *)(void *)addr)->ifr_name, sizeof(ifr.ifr_name), "%s", if_name(ifp)); } break; /* * Set interface. */ case BIOCSETIF: { /* struct ifreq */ ifnet_t ifp; bcopy(addr, &ifr, sizeof(ifr)); ifr.ifr_name[IFNAMSIZ - 1] = '\0'; ifp = ifunit(__unsafe_null_terminated_from_indexable(ifr.ifr_name, &ifr.ifr_name[IFNAMSIZ - 1])); if (ifp == NULL) { error = ENXIO; } else { error = bpf_setif(d, ifp, true, false, false, proc); } break; } /* * Set read timeout. */ case BIOCSRTIMEOUT32: { /* struct user32_timeval */ struct user32_timeval _tv; struct timeval tv; bcopy(addr, &_tv, sizeof(_tv)); tv.tv_sec = _tv.tv_sec; tv.tv_usec = _tv.tv_usec; /* * Subtract 1 tick from tvtohz() since this isn't * a one-shot timer. */ if ((error = itimerfix(&tv)) == 0) { d->bd_rtout = tvtohz(&tv) - 1; } break; } case BIOCSRTIMEOUT64: { /* struct user64_timeval */ struct user64_timeval _tv; struct timeval tv; bcopy(addr, &_tv, sizeof(_tv)); tv.tv_sec = (__darwin_time_t)_tv.tv_sec; tv.tv_usec = _tv.tv_usec; /* * Subtract 1 tick from tvtohz() since this isn't * a one-shot timer. */ if ((error = itimerfix(&tv)) == 0) { d->bd_rtout = tvtohz(&tv) - 1; } break; } /* * Get read timeout. */ case BIOCGRTIMEOUT32: { /* struct user32_timeval */ struct user32_timeval tv; bzero(&tv, sizeof(tv)); tv.tv_sec = d->bd_rtout / hz; tv.tv_usec = (d->bd_rtout % hz) * tick; bcopy(&tv, addr, sizeof(tv)); break; } case BIOCGRTIMEOUT64: { /* struct user64_timeval */ struct user64_timeval tv; bzero(&tv, sizeof(tv)); tv.tv_sec = d->bd_rtout / hz; tv.tv_usec = (d->bd_rtout % hz) * tick; bcopy(&tv, addr, sizeof(tv)); break; } /* * Get packet stats. */ case BIOCGSTATS: { /* struct bpf_stat */ struct bpf_stat bs; bzero(&bs, sizeof(bs)); bs.bs_recv = (u_int)d->bd_rcount; bs.bs_drop = (u_int)d->bd_dcount; bcopy(&bs, addr, sizeof(bs)); break; } /* * Set immediate mode. */ case BIOCIMMEDIATE: /* u_int */ d->bd_immediate = *(u_char *)(void *)addr; break; case BIOCVERSION: { /* struct bpf_version */ struct bpf_version bv; bzero(&bv, sizeof(bv)); bv.bv_major = BPF_MAJOR_VERSION; bv.bv_minor = BPF_MINOR_VERSION; bcopy(&bv, addr, sizeof(bv)); break; } /* * Get "header already complete" flag */ case BIOCGHDRCMPLT: { /* u_int */ u_int *addr_int = (u_int *)(void *)addr; *addr_int = d->bd_hdrcmplt; break; } /* * Set "header already complete" flag */ case BIOCSHDRCMPLT: /* u_int */ bcopy(addr, &int_arg, sizeof(int_arg)); if (int_arg == 0 && (d->bd_flags & BPF_BATCH_WRITE)) { os_log(OS_LOG_DEFAULT, "bpf%u cannot set BIOCSHDRCMPLT when BIOCSBATCHWRITE is set", d->bd_dev_minor); error = EINVAL; break; } d->bd_hdrcmplt = int_arg ? 1 : 0; break; /* * Get "see sent packets" flag */ case BIOCGSEESENT: { /* u_int */ int_arg = 0; if (d->bd_direction & BPF_D_OUT) { int_arg = 1; } bcopy(&int_arg, addr, sizeof(u_int)); break; } /* * Set "see sent packets" flag */ case BIOCSSEESENT: { /* u_int */ bcopy(addr, &int_arg, sizeof(u_int)); if (int_arg == 0) { d->bd_direction = BPF_D_IN; } else { d->bd_direction = BPF_D_INOUT; } break; } /* * Get direction of tapped packets that can be seen for reading */ case BIOCGDIRECTION: { /* u_int */ int_arg = d->bd_direction; bcopy(&int_arg, addr, sizeof(u_int)); break; } /* * Set direction of tapped packets that can be seen for reading */ case BIOCSDIRECTION: { /* u_int */ bcopy(addr, &int_arg, sizeof(u_int)); switch (int_arg) { case BPF_D_NONE: case BPF_D_IN: case BPF_D_OUT: case BPF_D_INOUT: d->bd_direction = int_arg; break; default: error = EINVAL; break; } break; } /* * Set traffic service class */ case BIOCSETTC: { /* int */ int tc; bcopy(addr, &tc, sizeof(int)); if (tc != 0 && (d->bd_flags & BPF_BATCH_WRITE)) { os_log(OS_LOG_DEFAULT, "bpf%u cannot set BIOCSETTC when BIOCSBATCHWRITE is set", d->bd_dev_minor); error = EINVAL; break; } error = bpf_set_traffic_class(d, tc); break; } /* * Get traffic service class */ case BIOCGETTC: { /* int */ static_assert(sizeof(d->bd_traffic_class) == sizeof(int)); bcopy(&d->bd_traffic_class, addr, sizeof(int)); break; } case FIONBIO: /* Non-blocking I/O; int */ break; case FIOASYNC: { /* Send signal on receive packets; int */ static_assert(sizeof(d->bd_async) == sizeof(int)); bcopy(addr, &d->bd_async, sizeof(int)); break; } case BIOCSRSIG: { /* Set receive signal; u_int */ u_int sig; bcopy(addr, &sig, sizeof(u_int)); if (sig >= NSIG) { error = EINVAL; } else { d->bd_sig = sig; } break; } case BIOCGRSIG: { /* u_int */ static_assert(sizeof(d->bd_sig) == sizeof(u_int)); bcopy(&d->bd_sig, addr, sizeof(u_int)); break; } case BIOCSEXTHDR: /* u_int */ bcopy(addr, &int_arg, sizeof(int_arg)); if (int_arg) { d->bd_flags |= BPF_EXTENDED_HDR; } else { d->bd_flags &= ~BPF_EXTENDED_HDR; } break; case BIOCGIFATTACHCOUNT: { /* struct ifreq */ ifnet_t ifp; struct bpf_if *bp; bcopy(addr, &ifr, sizeof(ifr)); ifr.ifr_name[IFNAMSIZ - 1] = '\0'; ifp = ifunit(__unsafe_null_terminated_from_indexable(ifr.ifr_name, &ifr.ifr_name[IFNAMSIZ - 1])); if (ifp == NULL) { error = ENXIO; break; } ifr.ifr_intval = 0; for (bp = bpf_iflist; bp != 0; bp = bp->bif_next) { struct bpf_d *bpf_d; if (bp->bif_ifp == NULL || bp->bif_ifp != ifp) { continue; } for (bpf_d = bp->bif_dlist; bpf_d; bpf_d = bpf_d->bd_next) { ifr.ifr_intval += 1; } } bcopy(&ifr, addr, sizeof(ifr)); break; } case BIOCGWANTPKTAP: /* u_int */ int_arg = d->bd_flags & BPF_WANT_PKTAP ? 1 : 0; bcopy(&int_arg, addr, sizeof(int_arg)); break; case BIOCSWANTPKTAP: /* u_int */ bcopy(addr, &int_arg, sizeof(int_arg)); if (int_arg) { d->bd_flags |= BPF_WANT_PKTAP; } else { d->bd_flags &= ~BPF_WANT_PKTAP; } break; case BIOCSHEADDROP: bcopy(addr, &int_arg, sizeof(int_arg)); d->bd_headdrop = int_arg ? 1 : 0; break; case BIOCGHEADDROP: { u_int *addr_int = (uint *)(void *)addr; *addr_int = d->bd_headdrop; break; } case BIOCSTRUNCATE: bcopy(addr, &int_arg, sizeof(int_arg)); if (int_arg) { d->bd_flags |= BPF_TRUNCATE; } else { d->bd_flags &= ~BPF_TRUNCATE; } break; case BIOCGETUUID: /* uuid_t */ bcopy(&d->bd_uuid, addr, sizeof(uuid_t)); break; case BIOCSETUP: { struct bpf_setup_args bsa; ifnet_t ifp; bcopy(addr, &bsa, sizeof(struct bpf_setup_args)); bsa.bsa_ifname[IFNAMSIZ - 1] = 0; ifp = ifunit(__unsafe_null_terminated_from_indexable(bsa.bsa_ifname, &bsa.bsa_ifname[IFNAMSIZ - 1])); if (ifp == NULL) { error = ENXIO; os_log_error(OS_LOG_DEFAULT, "%s: ifnet not found for %s error %d", __func__, bsa.bsa_ifname, error); break; } error = bpf_setup(d, bsa.bsa_uuid, ifp, proc); break; } case BIOCSPKTHDRV2: bcopy(addr, &int_arg, sizeof(int_arg)); if (int_arg != 0) { d->bd_flags |= BPF_PKTHDRV2; } else { d->bd_flags &= ~BPF_PKTHDRV2; } break; case BIOCGPKTHDRV2: int_arg = d->bd_flags & BPF_PKTHDRV2 ? 1 : 0; bcopy(&int_arg, addr, sizeof(int_arg)); break; case BIOCGHDRCOMP: int_arg = d->bd_flags & BPF_COMP_REQ ? 1 : 0; bcopy(&int_arg, addr, sizeof(int_arg)); break; case BIOCSHDRCOMP: bcopy(addr, &int_arg, sizeof(int_arg)); if (int_arg != 0 && int_arg != 1) { return EINVAL; } if (d->bd_bif != 0 || (d->bd_flags & BPF_DETACHING)) { /* * Interface already attached, unable to change buffers */ error = EINVAL; break; } if (int_arg != 0) { d->bd_flags |= BPF_COMP_REQ; if (bpf_hdr_comp_enable != 0) { d->bd_flags |= BPF_COMP_ENABLED; } } else { d->bd_flags &= ~(BPF_COMP_REQ | BPF_COMP_ENABLED); } break; case BIOCGHDRCOMPON: int_arg = d->bd_flags & BPF_COMP_ENABLED ? 1 : 0; bcopy(&int_arg, addr, sizeof(int_arg)); break; case BIOCGHDRCOMPSTATS: { struct bpf_comp_stats bcs = {}; bcs = d->bd_bcs; bcopy(&bcs, addr, sizeof(bcs)); break; } case BIOCSWRITEMAX: bcopy(addr, &int_arg, sizeof(int_arg)); if (int_arg > BPF_WRITE_MAX) { os_log(OS_LOG_DEFAULT, "bpf%u bd_write_size_max %u too big", d->bd_dev_minor, d->bd_write_size_max); error = EINVAL; break; } d->bd_write_size_max = int_arg; break; case BIOCGWRITEMAX: int_arg = d->bd_write_size_max; bcopy(&int_arg, addr, sizeof(int_arg)); break; case BIOCGBATCHWRITE: /* int */ int_arg = d->bd_flags & BPF_BATCH_WRITE ? 1 : 0; bcopy(&int_arg, addr, sizeof(int_arg)); break; case BIOCSBATCHWRITE: /* int */ bcopy(addr, &int_arg, sizeof(int_arg)); if (int_arg != 0) { if (d->bd_hdrcmplt == 0) { os_log(OS_LOG_DEFAULT, "bpf%u cannot set BIOCSBATCHWRITE when BIOCSHDRCMPLT is not set", d->bd_dev_minor); error = EINVAL; break; } if (d->bd_traffic_class != 0) { os_log(OS_LOG_DEFAULT, "bpf%u cannot set BIOCSBATCHWRITE when BIOCSETTC is set", d->bd_dev_minor); error = EINVAL; break; } d->bd_flags |= BPF_BATCH_WRITE; } else { d->bd_flags &= ~BPF_BATCH_WRITE; } break; case BIOCGNOTSTAMP: if (d->bd_tstamp == BPF_T_NONE) { int_arg = 1; } else { int_arg = 0; } bcopy(&int_arg, addr, sizeof(int_arg)); break; case BIOCSNOTSTAMP: bcopy(addr, &int_arg, sizeof(int_arg)); switch (int_arg) { case 0: d->bd_tstamp = BPF_T_MICROTIME; break; default: d->bd_tstamp = BPF_T_NONE; break; } break; case BIOCGDVRTIN: int_arg = d->bd_flags & BPF_DIVERT_IN ? 1 : 0; bcopy(&int_arg, addr, sizeof(int_arg)); break; case BIOCSDVRTIN: if (d->bd_bif == NULL) { /* * No interface attached yet. */ error = ENXIO; break; } bcopy(addr, &int_arg, sizeof(int_arg)); if (int_arg == 0) { if ((d->bd_flags & BPF_DIVERT_IN) == 0) { error = EINVAL; break; } d->bd_flags &= ~BPF_DIVERT_IN; if_clear_xflags(d->bd_bif->bif_ifp, IFXF_DISABLE_INPUT); } else { if ((d->bd_flags & BPF_DIVERT_IN) != 0 || (d->bd_bif->bif_ifp->if_xflags & IFXF_DISABLE_INPUT) != 0) { error = EALREADY; break; } d->bd_flags |= BPF_DIVERT_IN; if_set_xflags(d->bd_bif->bif_ifp, IFXF_DISABLE_INPUT); } break; } #if DEVELOPMENT || DEBUG if (bpf_debug > 0) { log_bpf_ioctl_str(d, cmd, error); } #endif /* DEVELOPMENT || DEBUG */ bpf_release_d(d); lck_mtx_unlock(bpf_mlock); return error; } /* * Set d's packet filter program to fp. If this file already has a filter, * free it and replace it. Returns EINVAL for bogus requests. */ static int bpf_setf(struct bpf_d *d, u_int bf_len, user_addr_t bf_insns, u_long cmd) { struct bpf_insn *fcode, *old; u_int flen, size; while (d->bd_hbuf_read) { msleep((caddr_t)d, bpf_mlock, PRINET, "bpf_setf", NULL); } if ((d->bd_flags & BPF_CLOSING) != 0) { return ENXIO; } old = d->bd_filter; if (bf_insns == USER_ADDR_NULL) { if (bf_len != 0) { return EINVAL; } d->bd_filter = NULL; d->bd_filter_len = 0; reset_d(d); if (old != 0) { kfree_data_addr(old); } return 0; } flen = bf_len; if (flen > BPF_MAXINSNS) { return EINVAL; } size = flen * sizeof(struct bpf_insn); fcode = (struct bpf_insn *) kalloc_data(size, Z_WAITOK | Z_ZERO); if (fcode == NULL) { return ENOMEM; } if (copyin(bf_insns, (caddr_t)fcode, size) == 0 && bpf_validate(fcode, (int)flen)) { d->bd_filter = fcode; d->bd_filter_len = flen; if (cmd == BIOCSETF32 || cmd == BIOCSETF64) { reset_d(d); } if (old != 0) { kfree_data_addr(old); } return 0; } kfree_data(fcode, size); return EINVAL; } /* * Detach a file from its current interface (if attached at all) and attach * to the interface indicated by the name stored in ifr. * Return an errno or 0. */ static int bpf_setif(struct bpf_d *d, ifnet_t theywant, bool do_reset, bool has_hbuf_read_write, bool has_bufs_allocated, struct proc *proc) { struct bpf_if *bp; int error; while (!has_hbuf_read_write && (d->bd_hbuf_read || d->bd_hbuf_write)) { msleep((caddr_t)d, bpf_mlock, PRINET, "bpf_setif", NULL); } if ((d->bd_flags & BPF_CLOSING) != 0) { return ENXIO; } /* * Look through attached interfaces for the named one. */ for (bp = bpf_iflist; bp != 0; bp = bp->bif_next) { struct ifnet *ifp = bp->bif_ifp; if (ifp == 0 || ifp != theywant) { continue; } /* * Do not use DLT_PKTAP, unless requested explicitly */ if (bp->bif_dlt == DLT_PKTAP && !(d->bd_flags & BPF_WANT_PKTAP)) { continue; } /* * Skip the coprocessor interface */ if (!intcoproc_unrestricted && IFNET_IS_INTCOPROC(ifp)) { continue; } /* * We found the requested interface. * Allocate the packet buffers. */ if (has_bufs_allocated == false) { error = bpf_allocbufs(d); if (error != 0) { return error; } } /* * Detach if attached to something else. */ if (bp != d->bd_bif) { if (d->bd_bif != NULL) { if (bpf_detachd(d, proc) != 0) { return ENXIO; } } if (bpf_attachd(d, bp) != 0) { return ENXIO; } } if (do_reset) { reset_d(d); } os_log(OS_LOG_DEFAULT, "bpf%u attached to %s by %s:%u", d->bd_dev_minor, if_name(theywant), proc_name_address(proc), proc_pid(proc)); return 0; } /* Not found. */ return ENXIO; } /* * Get a list of available data link type of the interface. */ static int bpf_getdltlist(struct bpf_d *d, caddr_t __bidi_indexable addr, struct proc *proc) { u_int n; int error; struct ifnet *ifp; struct bpf_if *bp; user_addr_t dlist; struct bpf_dltlist bfl; bcopy(addr, &bfl, sizeof(bfl)); if (proc_is64bit(proc)) { dlist = (user_addr_t)bfl.bfl_u.bflu_pad; } else { dlist = CAST_USER_ADDR_T(bfl.bfl_u.bflu_list); } ifp = d->bd_bif->bif_ifp; n = 0; error = 0; for (bp = bpf_iflist; bp; bp = bp->bif_next) { if (bp->bif_ifp != ifp) { continue; } /* * Do not use DLT_PKTAP, unless requested explicitly */ if (bp->bif_dlt == DLT_PKTAP && !(d->bd_flags & BPF_WANT_PKTAP)) { continue; } if (dlist != USER_ADDR_NULL) { if (n >= bfl.bfl_len) { return ENOMEM; } error = copyout(&bp->bif_dlt, dlist, sizeof(bp->bif_dlt)); if (error != 0) { break; } dlist += sizeof(bp->bif_dlt); } n++; } bfl.bfl_len = n; bcopy(&bfl, addr, sizeof(bfl)); return error; } /* * Set the data link type of a BPF instance. */ static int bpf_setdlt(struct bpf_d *d, uint32_t dlt, struct proc *proc) { int error, opromisc; struct ifnet *ifp; struct bpf_if *bp; if (d->bd_bif->bif_dlt == dlt) { return 0; } while (d->bd_hbuf_read) { msleep((caddr_t)d, bpf_mlock, PRINET, "bpf_setdlt", NULL); } if ((d->bd_flags & BPF_CLOSING) != 0) { return ENXIO; } ifp = d->bd_bif->bif_ifp; for (bp = bpf_iflist; bp; bp = bp->bif_next) { if (bp->bif_ifp == ifp && bp->bif_dlt == dlt) { /* * Do not use DLT_PKTAP, unless requested explicitly */ if (bp->bif_dlt == DLT_PKTAP && !(d->bd_flags & BPF_WANT_PKTAP)) { continue; } break; } } if (bp != NULL) { opromisc = d->bd_promisc; if (bpf_detachd(d, proc) != 0) { return ENXIO; } error = bpf_attachd(d, bp); if (error != 0) { os_log_error(OS_LOG_DEFAULT, "bpf_setdlt: bpf%d bpf_attachd %s error %d", d->bd_dev_minor, if_name(bp->bif_ifp), error); return error; } reset_d(d); if (opromisc) { lck_mtx_unlock(bpf_mlock); error = ifnet_set_promiscuous(bp->bif_ifp, 1); lck_mtx_lock(bpf_mlock); if (error != 0) { os_log_error(OS_LOG_DEFAULT, "bpf_setdlt: bpf%d ifpromisc %s error %d", d->bd_dev_minor, if_name(bp->bif_ifp), error); } else { d->bd_promisc = 1; } } } return bp == NULL ? EINVAL : 0; } static int bpf_set_traffic_class(struct bpf_d *d, int tc) { int error = 0; if (!SO_VALID_TC(tc)) { error = EINVAL; } else { d->bd_traffic_class = tc; } return error; } static void bpf_set_packet_service_class(struct mbuf *m, int tc) { if (!(m->m_flags & M_PKTHDR)) { return; } VERIFY(SO_VALID_TC(tc)); (void) m_set_service_class(m, so_tc2msc(tc)); } /* * Support for select() * * Return true iff the specific operation will not block indefinitely. * Otherwise, return false but make a note that a selwakeup() must be done. */ int bpfselect(dev_t dev, int which, void * wql, struct proc *proc) { struct bpf_d *d; int ret = 0; lck_mtx_lock(bpf_mlock); d = bpf_dtab[minor(dev)]; if (d == NULL || d == BPF_DEV_RESERVED || (d->bd_flags & BPF_CLOSING) != 0) { lck_mtx_unlock(bpf_mlock); return ENXIO; } bpf_acquire_d(d); if (d->bd_bif == NULL) { bpf_release_d(d); lck_mtx_unlock(bpf_mlock); return ENXIO; } while (d->bd_hbuf_read) { msleep((caddr_t)d, bpf_mlock, PRINET, "bpfselect", NULL); } if ((d->bd_flags & BPF_CLOSING) != 0) { bpf_release_d(d); lck_mtx_unlock(bpf_mlock); return ENXIO; } switch (which) { case FREAD: if (d->bd_hlen != 0 || ((d->bd_immediate || d->bd_state == BPF_TIMED_OUT) && d->bd_slen != 0)) { ret = 1; /* read has data to return */ } else { /* * Read has no data to return. * Make the select wait, and start a timer if * necessary. */ selrecord(proc, &d->bd_sel, wql); bpf_start_timer(d); } break; case FWRITE: /* can't determine whether a write would block */ ret = 1; break; } bpf_release_d(d); lck_mtx_unlock(bpf_mlock); return ret; } /* * Support for kevent() system call. Register EVFILT_READ filters and * reject all others. */ int bpfkqfilter(dev_t dev, struct knote *kn); static void filt_bpfdetach(struct knote *); static int filt_bpfread(struct knote *, long); static int filt_bpftouch(struct knote *kn, struct kevent_qos_s *kev); static int filt_bpfprocess(struct knote *kn, struct kevent_qos_s *kev); SECURITY_READ_ONLY_EARLY(struct filterops) bpfread_filtops = { .f_isfd = 1, .f_detach = filt_bpfdetach, .f_event = filt_bpfread, .f_touch = filt_bpftouch, .f_process = filt_bpfprocess, }; static int filt_bpfread_common(struct knote *kn, struct kevent_qos_s *kev, struct bpf_d *d) { int ready = 0; int64_t data = 0; if (d->bd_immediate) { /* * If there's data in the hold buffer, it's the * amount of data a read will return. * * If there's no data in the hold buffer, but * there's data in the store buffer, a read will * immediately rotate the store buffer to the * hold buffer, the amount of data in the store * buffer is the amount of data a read will * return. * * If there's no data in either buffer, we're not * ready to read. */ data = (d->bd_hlen == 0 || d->bd_hbuf_read ? d->bd_slen : d->bd_hlen); int64_t lowwat = knote_low_watermark(kn); if (lowwat > d->bd_bufsize) { lowwat = d->bd_bufsize; } ready = (data >= lowwat); } else { /* * If there's data in the hold buffer, it's the * amount of data a read will return. * * If there's no data in the hold buffer, but * there's data in the store buffer, if the * timer has expired a read will immediately * rotate the store buffer to the hold buffer, * so the amount of data in the store buffer is * the amount of data a read will return. * * If there's no data in either buffer, or there's * no data in the hold buffer and the timer hasn't * expired, we're not ready to read. */ data = ((d->bd_hlen == 0 || d->bd_hbuf_read) && d->bd_state == BPF_TIMED_OUT ? d->bd_slen : d->bd_hlen); ready = (data > 0); } if (!ready) { bpf_start_timer(d); } else if (kev) { knote_fill_kevent(kn, kev, data); } return ready; } int bpfkqfilter(dev_t dev, struct knote *kn) { struct bpf_d *d; int res; /* * Is this device a bpf? */ if (major(dev) != CDEV_MAJOR || kn->kn_filter != EVFILT_READ) { knote_set_error(kn, EINVAL); return 0; } lck_mtx_lock(bpf_mlock); d = bpf_dtab[minor(dev)]; if (d == NULL || d == BPF_DEV_RESERVED || (d->bd_flags & BPF_CLOSING) != 0 || d->bd_bif == NULL) { lck_mtx_unlock(bpf_mlock); knote_set_error(kn, ENXIO); return 0; } kn->kn_filtid = EVFILTID_BPFREAD; knote_kn_hook_set_raw(kn, d); KNOTE_ATTACH(&d->bd_sel.si_note, kn); d->bd_flags |= BPF_KNOTE; /* capture the current state */ res = filt_bpfread_common(kn, NULL, d); lck_mtx_unlock(bpf_mlock); return res; } static void filt_bpfdetach(struct knote *kn) { struct bpf_d *d = (struct bpf_d *)knote_kn_hook_get_raw(kn); lck_mtx_lock(bpf_mlock); if (d->bd_flags & BPF_KNOTE) { KNOTE_DETACH(&d->bd_sel.si_note, kn); d->bd_flags &= ~BPF_KNOTE; } lck_mtx_unlock(bpf_mlock); } static int filt_bpfread(struct knote *kn, long hint) { #pragma unused(hint) struct bpf_d *d = (struct bpf_d *)knote_kn_hook_get_raw(kn); return filt_bpfread_common(kn, NULL, d); } static int filt_bpftouch(struct knote *kn, struct kevent_qos_s *kev) { struct bpf_d *d = (struct bpf_d *)knote_kn_hook_get_raw(kn); int res; lck_mtx_lock(bpf_mlock); /* save off the lowat threshold and flag */ kn->kn_sdata = kev->data; kn->kn_sfflags = kev->fflags; /* output data will be re-generated here */ res = filt_bpfread_common(kn, NULL, d); lck_mtx_unlock(bpf_mlock); return res; } static int filt_bpfprocess(struct knote *kn, struct kevent_qos_s *kev) { struct bpf_d *d = (struct bpf_d *)knote_kn_hook_get_raw(kn); int res; lck_mtx_lock(bpf_mlock); res = filt_bpfread_common(kn, kev, d); lck_mtx_unlock(bpf_mlock); return res; } /* * Copy data from an mbuf chain into a buffer. This code is derived * from m_copydata in kern/uipc_mbuf.c. */ static void bpf_mcopy(struct mbuf *m, uint8_t *__sized_by(len) dst, size_t len, size_t offset) { u_int count; while (offset >= m->m_len) { offset -= m->m_len; m = m->m_next; if (m == NULL) { panic("bpf_mcopy"); } continue; } while (len > 0) { if (m == NULL) { panic("bpf_mcopy"); } count = MIN(m->m_len - (u_int)offset, (u_int)len); bcopy(m_mtod_current(m) + offset, dst, count); m = m->m_next; dst += count; len -= count; offset = 0; } } static inline void bpf_tap_imp( ifnet_t ifp, u_int32_t dlt, struct bpf_packet *bpf_pkt, int outbound) { struct bpf_d *d; u_int slen; struct bpf_if *bp; /* * It's possible that we get here after the bpf descriptor has been * detached from the interface; in such a case we simply return. * Lock ordering is important since we can be called asynchronously * (from IOKit) to process an inbound packet; when that happens * we would have been holding its "gateLock" and will be acquiring * "bpf_mlock" upon entering this routine. Due to that, we release * "bpf_mlock" prior to calling ifnet_set_promiscuous (which will * acquire "gateLock" in the IOKit), in order to avoid a deadlock * when a ifnet_set_promiscuous request simultaneously collides with * an inbound packet being passed into the tap callback. */ lck_mtx_lock(bpf_mlock); if (ifp->if_bpf == NULL) { lck_mtx_unlock(bpf_mlock); return; } for (bp = ifp->if_bpf; bp != NULL; bp = bp->bif_next) { if (bp->bif_ifp != ifp) { /* wrong interface */ bp = NULL; break; } if (dlt == 0 || bp->bif_dlt == dlt) { /* tapping default DLT or DLT matches */ break; } } if (bp == NULL) { goto done; } for (d = bp->bif_dlist; d != NULL; d = d->bd_next) { struct bpf_packet *bpf_pkt_saved = bpf_pkt; u_char *bpf_pkt_ptr = (u_char *)(struct bpf_packet *__bidi_indexable)bpf_pkt; struct bpf_packet bpf_pkt_tmp = {}; struct pktap_header_buffer bpfp_header_tmp = {}; if (outbound && (d->bd_direction & BPF_D_OUT) == 0) { continue; } if (!outbound && (d->bd_direction & BPF_D_IN) == 0) { continue; } ++d->bd_rcount; slen = bpf_filter(d->bd_filter, d->bd_filter_len, bpf_pkt_ptr, (u_int)bpf_pkt->bpfp_total_length, 0); if (slen != 0) { if (bp->bif_ifp->if_type == IFT_PKTAP && bp->bif_dlt == DLT_PKTAP) { if (d->bd_flags & BPF_TRUNCATE) { slen = min(slen, get_pkt_trunc_len(bpf_pkt)); } /* * Need to copy the bpf_pkt because the conversion * to v2 pktap header modifies the content of the * bpfp_header */ if ((d->bd_flags & BPF_PKTHDRV2) && bpf_pkt->bpfp_header_length <= sizeof(bpfp_header_tmp)) { bpf_pkt_tmp = *bpf_pkt; bpf_pkt = &bpf_pkt_tmp; memcpy(&bpfp_header_tmp, bpf_pkt->bpfp_header, bpf_pkt->bpfp_header_length); bpf_pkt->bpfp_header = &bpfp_header_tmp; bpf_pkt->bpfp_header_length = bpf_pkt->bpfp_header_length; convert_to_pktap_header_to_v2(bpf_pkt, !!(d->bd_flags & BPF_TRUNCATE)); } } ++d->bd_fcount; catchpacket(d, bpf_pkt, slen, outbound); } bpf_pkt = bpf_pkt_saved; } done: lck_mtx_unlock(bpf_mlock); } static inline void bpf_tap_mbuf( ifnet_t ifp, u_int32_t dlt, mbuf_t m, void *__sized_by(hlen) hdr, size_t hlen, int outbound) { struct bpf_packet bpf_pkt; mbuf_ref_t m0; if (ifp->if_bpf == NULL) { /* quickly check without taking lock */ return; } bpf_pkt.bpfp_type = BPF_PACKET_TYPE_MBUF; bpf_pkt.bpfp_mbuf = m; bpf_pkt.bpfp_total_length = 0; for (m0 = m; m0 != NULL; m0 = m0->m_next) { bpf_pkt.bpfp_total_length += m0->m_len; } if (hdr != NULL) { bpf_pkt.bpfp_header = hdr; bpf_pkt.bpfp_header_length = hlen; bpf_pkt.bpfp_total_length += hlen; } else { bpf_pkt.bpfp_header = NULL; bpf_pkt.bpfp_header_length = 0; } bpf_tap_imp(ifp, dlt, &bpf_pkt, outbound); } void bpf_tap_out( ifnet_t ifp, u_int32_t dlt, mbuf_t m, void *__sized_by(hlen) hdr, size_t hlen) { bpf_tap_mbuf(ifp, dlt, m, hdr, hlen, 1); } void bpf_tap_in( ifnet_t ifp, u_int32_t dlt, mbuf_t m, void *__sized_by(hlen) hdr, size_t hlen) { bpf_tap_mbuf(ifp, dlt, m, hdr, hlen, 0); } /* Callback registered with Ethernet driver. */ static int bpf_tap_callback(struct ifnet *ifp, struct mbuf *m) { bpf_tap_mbuf(ifp, 0, m, NULL, 0, mbuf_pkthdr_rcvif(m) == NULL); return 0; } #if SKYWALK #include <skywalk/os_skywalk_private.h> static void bpf_pktcopy(kern_packet_t pkt, uint8_t *__sized_by(len) dst, size_t len, size_t offset) { kern_buflet_t buflet = NULL; size_t count; while (len > 0) { uint8_t *addr; uint32_t buflet_length; uint32_t buflet_offset; uint32_t limit; buflet = kern_packet_get_next_buflet(pkt, buflet); VERIFY(buflet != NULL); limit = kern_buflet_get_data_limit(buflet); buflet_offset = kern_buflet_get_data_offset(buflet); addr = __unsafe_forge_bidi_indexable(uint8_t *, (uintptr_t)kern_buflet_get_data_address(buflet) + buflet_offset, limit - buflet_offset); VERIFY(addr != NULL); buflet_length = kern_buflet_get_data_length(buflet); if (offset >= buflet_length) { offset -= buflet_length; continue; } count = MIN(buflet_length - offset, len); bcopy((void *)(addr + offset), (void *)dst, count); dst += count; len -= count; offset = 0; } } static inline void bpf_tap_packet( ifnet_t ifp, u_int32_t dlt, kern_packet_t pkt, void *__sized_by(hlen) hdr, size_t hlen, int outbound) { struct bpf_packet bpf_pkt; struct mbuf * m; if (ifp->if_bpf == NULL) { /* quickly check without taking lock */ return; } m = kern_packet_get_mbuf(pkt); if (m != NULL) { bpf_pkt.bpfp_type = BPF_PACKET_TYPE_MBUF; bpf_pkt.bpfp_mbuf = m; bpf_pkt.bpfp_total_length = m_length(m); } else { bpf_pkt.bpfp_type = BPF_PACKET_TYPE_PKT; bpf_pkt.bpfp_pkt = pkt; if (PKT_ADDR(pkt)->pkt_pflags & PKT_F_TRUNCATED) { struct __kern_buflet *bft = kern_packet_get_next_buflet(pkt, NULL); bpf_pkt.bpfp_total_length = kern_buflet_get_data_length(bft); } else { bpf_pkt.bpfp_total_length = kern_packet_get_data_length(pkt); } } bpf_pkt.bpfp_header = hdr; bpf_pkt.bpfp_header_length = hlen; if (hlen != 0) { bpf_pkt.bpfp_total_length += hlen; } bpf_tap_imp(ifp, dlt, &bpf_pkt, outbound); } void bpf_tap_packet_out( ifnet_t ifp, u_int32_t dlt, kern_packet_t pkt, void *__sized_by(hlen) hdr, size_t hlen) { bpf_tap_packet(ifp, dlt, pkt, hdr, hlen, 1); } void bpf_tap_packet_in( ifnet_t ifp, u_int32_t dlt, kern_packet_t pkt, void *__sized_by(hlen) hdr, size_t hlen) { bpf_tap_packet(ifp, dlt, pkt, hdr, hlen, 0); } #endif /* SKYWALK */ static errno_t bpf_copydata(struct bpf_packet *pkt, size_t off, size_t len, void *__sized_by(len) out_data) { errno_t err = 0; if (pkt->bpfp_type == BPF_PACKET_TYPE_MBUF) { err = mbuf_copydata(pkt->bpfp_mbuf, off, len, out_data); #if SKYWALK } else if (pkt->bpfp_type == BPF_PACKET_TYPE_PKT) { err = kern_packet_copy_bytes(pkt->bpfp_pkt, off, len, out_data); #endif /* SKYWALK */ } else { err = EINVAL; } return err; } static void copy_bpf_packet_offset(struct bpf_packet * pkt, uint8_t *__sized_by(len) dst, size_t len, size_t offset) { /* copy the optional header */ if (offset < pkt->bpfp_header_length) { size_t count = MIN(len, pkt->bpfp_header_length - offset); caddr_t src = pkt->bpfp_header; bcopy(src + offset, dst, count); dst += count; len -= count; offset = 0; } else { offset -= pkt->bpfp_header_length; } if (len == 0) { /* nothing past the header */ return; } /* copy the packet */ switch (pkt->bpfp_type) { case BPF_PACKET_TYPE_MBUF: bpf_mcopy(pkt->bpfp_mbuf, dst, len, offset); break; #if SKYWALK case BPF_PACKET_TYPE_PKT: bpf_pktcopy(pkt->bpfp_pkt, dst, len, offset); break; #endif /* SKYWALK */ default: break; } } static void copy_bpf_packet(struct bpf_packet * pkt, uint8_t *__sized_by(len) dst, size_t len) { copy_bpf_packet_offset(pkt, dst, len, 0); } static uint32_t get_esp_trunc_len(__unused struct bpf_packet *pkt, __unused uint32_t off, const uint32_t remaining_caplen) { /* * For some reason tcpdump expects to have one byte beyond the ESP header */ uint32_t trunc_len = ESP_HDR_SIZE + 1; if (trunc_len > remaining_caplen) { return remaining_caplen; } return trunc_len; } static uint32_t get_isakmp_trunc_len(__unused struct bpf_packet *pkt, __unused uint32_t off, const uint32_t remaining_caplen) { /* * Include the payload generic header */ uint32_t trunc_len = ISAKMP_HDR_SIZE; if (trunc_len > remaining_caplen) { return remaining_caplen; } return trunc_len; } static uint32_t get_isakmp_natt_trunc_len(struct bpf_packet *pkt, uint32_t off, const uint32_t remaining_caplen) { int err = 0; uint32_t trunc_len = 0; char payload[remaining_caplen]; err = bpf_copydata(pkt, off, remaining_caplen, payload); if (err != 0) { return remaining_caplen; } /* * They are three cases: * - IKE: payload start with 4 bytes header set to zero before ISAKMP header * - keep alive: 1 byte payload * - otherwise it's ESP */ if (remaining_caplen >= 4 && payload[0] == 0 && payload[1] == 0 && payload[2] == 0 && payload[3] == 0) { trunc_len = 4 + get_isakmp_trunc_len(pkt, off + 4, remaining_caplen - 4); } else if (remaining_caplen == 1) { trunc_len = 1; } else { trunc_len = get_esp_trunc_len(pkt, off, remaining_caplen); } if (trunc_len > remaining_caplen) { return remaining_caplen; } return trunc_len; } static uint32_t get_udp_trunc_len(struct bpf_packet *pkt, uint32_t off, const uint32_t remaining_caplen) { int err = 0; uint32_t trunc_len = sizeof(struct udphdr); /* By default no UDP payload */ if (trunc_len >= remaining_caplen) { return remaining_caplen; } struct udphdr udphdr; err = bpf_copydata(pkt, off, sizeof(struct udphdr), &udphdr); if (err != 0) { return remaining_caplen; } u_short sport, dport; sport = EXTRACT_SHORT(&udphdr.uh_sport); dport = EXTRACT_SHORT(&udphdr.uh_dport); if (dport == PORT_DNS || sport == PORT_DNS) { /* * Full UDP payload for DNS */ trunc_len = remaining_caplen; } else if ((sport == PORT_BOOTPS && dport == PORT_BOOTPC) || (sport == PORT_BOOTPC && dport == PORT_BOOTPS)) { /* * Full UDP payload for BOOTP and DHCP */ trunc_len = remaining_caplen; } else if (dport == PORT_ISAKMP && sport == PORT_ISAKMP) { /* * Return the ISAKMP header */ trunc_len += get_isakmp_trunc_len(pkt, off + sizeof(struct udphdr), remaining_caplen - sizeof(struct udphdr)); } else if (dport == PORT_ISAKMP_NATT && sport == PORT_ISAKMP_NATT) { trunc_len += get_isakmp_natt_trunc_len(pkt, off + sizeof(struct udphdr), remaining_caplen - sizeof(struct udphdr)); } if (trunc_len >= remaining_caplen) { return remaining_caplen; } return trunc_len; } static uint32_t get_tcp_trunc_len(struct bpf_packet *pkt, uint32_t off, const uint32_t remaining_caplen) { int err = 0; uint32_t trunc_len = sizeof(struct tcphdr); /* By default no TCP payload */ if (trunc_len >= remaining_caplen) { return remaining_caplen; } struct tcphdr tcphdr; err = bpf_copydata(pkt, off, sizeof(struct tcphdr), &tcphdr); if (err != 0) { return remaining_caplen; } u_short sport, dport; sport = EXTRACT_SHORT(&tcphdr.th_sport); dport = EXTRACT_SHORT(&tcphdr.th_dport); if (dport == PORT_DNS || sport == PORT_DNS) { /* * Full TCP payload for DNS */ trunc_len = remaining_caplen; } else { trunc_len = (uint16_t)(tcphdr.th_off << 2); } if (trunc_len >= remaining_caplen) { return remaining_caplen; } return trunc_len; } static uint32_t get_proto_trunc_len(uint8_t proto, struct bpf_packet *pkt, uint32_t off, const uint32_t remaining_caplen) { uint32_t trunc_len; switch (proto) { case IPPROTO_ICMP: { /* * Full IMCP payload */ trunc_len = remaining_caplen; break; } case IPPROTO_ICMPV6: { /* * Full IMCPV6 payload */ trunc_len = remaining_caplen; break; } case IPPROTO_IGMP: { /* * Full IGMP payload */ trunc_len = remaining_caplen; break; } case IPPROTO_UDP: { trunc_len = get_udp_trunc_len(pkt, off, remaining_caplen); break; } case IPPROTO_TCP: { trunc_len = get_tcp_trunc_len(pkt, off, remaining_caplen); break; } case IPPROTO_ESP: { trunc_len = get_esp_trunc_len(pkt, off, remaining_caplen); break; } default: { /* * By default we only include the IP header */ trunc_len = 0; break; } } if (trunc_len >= remaining_caplen) { return remaining_caplen; } return trunc_len; } static uint32_t get_ip_trunc_len(struct bpf_packet *pkt, uint32_t off, const uint32_t remaining_caplen) { int err = 0; uint32_t iplen = sizeof(struct ip); if (iplen >= remaining_caplen) { return remaining_caplen; } struct ip iphdr; err = bpf_copydata(pkt, off, sizeof(struct ip), &iphdr); if (err != 0) { return remaining_caplen; } uint8_t proto = 0; iplen = (uint16_t)(iphdr.ip_hl << 2); if (iplen >= remaining_caplen) { return remaining_caplen; } proto = iphdr.ip_p; iplen += get_proto_trunc_len(proto, pkt, off + iplen, remaining_caplen - iplen); if (iplen >= remaining_caplen) { return remaining_caplen; } return iplen; } static uint32_t get_ip6_trunc_len(struct bpf_packet *pkt, uint32_t off, const uint32_t remaining_caplen) { int err = 0; uint32_t iplen = sizeof(struct ip6_hdr); if (iplen >= remaining_caplen) { return remaining_caplen; } struct ip6_hdr ip6hdr; err = bpf_copydata(pkt, off, sizeof(struct ip6_hdr), &ip6hdr); if (err != 0) { return remaining_caplen; } uint8_t proto = 0; /* * TBD: process the extension headers */ proto = ip6hdr.ip6_nxt; iplen += get_proto_trunc_len(proto, pkt, off + iplen, remaining_caplen - iplen); if (iplen >= remaining_caplen) { return remaining_caplen; } return iplen; } static uint32_t get_ether_trunc_len(struct bpf_packet *pkt, uint32_t off, const uint32_t remaining_caplen) { int err = 0; uint32_t ethlen = sizeof(struct ether_header); if (ethlen >= remaining_caplen) { return remaining_caplen; } struct ether_header eh = {}; err = bpf_copydata(pkt, off, sizeof(struct ether_header), &eh); if (err != 0) { return remaining_caplen; } u_short type = EXTRACT_SHORT(&eh.ether_type); /* Include full ARP */ if (type == ETHERTYPE_ARP) { ethlen = remaining_caplen; } else if (type == ETHERTYPE_IP) { ethlen += get_ip_trunc_len(pkt, off + sizeof(struct ether_header), remaining_caplen - ethlen); } else if (type == ETHERTYPE_IPV6) { ethlen += get_ip6_trunc_len(pkt, off + sizeof(struct ether_header), remaining_caplen - ethlen); } else { ethlen = MIN(BPF_MIN_PKT_SIZE, remaining_caplen); } return ethlen; } static uint32_t get_pkt_trunc_len(struct bpf_packet *pkt) { struct pktap_header *pktap = (struct pktap_header *) (pkt->bpfp_header); uint32_t in_pkt_len = 0; uint32_t out_pkt_len = 0; uint32_t tlen = 0; uint32_t pre_adjust; // L2 header not in mbuf or kern_packet // bpfp_total_length must contain the BPF packet header assert3u(pkt->bpfp_total_length, >=, pkt->bpfp_header_length); // The BPF packet header must contain the pktap header assert3u(pkt->bpfp_header_length, >=, pktap->pth_length); // The pre frame length (L2 header) must be contained in the packet assert3u(pkt->bpfp_total_length, >=, pktap->pth_length + pktap->pth_frame_pre_length); /* * pktap->pth_frame_pre_length is the L2 header length and accounts * for both L2 header in the packet payload and pre_adjust. * * pre_adjust represents an adjustment for a pseudo L2 header that is not * part of packet payload -- not in the mbuf or kern_packet -- and comes * just after the pktap header. * * pktap->pth_length is the size of the pktap header (exclude pre_adjust) * * pkt->bpfp_header_length is (pktap->pth_length + pre_adjust) */ pre_adjust = (uint32_t)(pkt->bpfp_header_length - pktap->pth_length); if (pktap->pth_iftype == IFT_ETHER) { /* * We need to parse the Ethernet header to find the network layer * protocol */ in_pkt_len = (uint32_t)(pkt->bpfp_total_length - pktap->pth_length - pre_adjust); out_pkt_len = get_ether_trunc_len(pkt, 0, in_pkt_len); tlen = pktap->pth_length + pre_adjust + out_pkt_len; } else { /* * For other interface types, we only know to parse IPv4 and IPv6. * * To get to the beginning of the IPv4 or IPv6 packet, we need to to skip * over the L2 header that is the actual packet payload (mbuf or kern_packet) */ uint32_t off; // offset past the L2 header in the actual packet payload off = pktap->pth_frame_pre_length - pre_adjust; in_pkt_len = (uint32_t)(pkt->bpfp_total_length - pktap->pth_length - pktap->pth_frame_pre_length); if (pktap->pth_protocol_family == AF_INET) { out_pkt_len = get_ip_trunc_len(pkt, off, in_pkt_len); } else if (pktap->pth_protocol_family == AF_INET6) { out_pkt_len = get_ip6_trunc_len(pkt, off, in_pkt_len); } else { out_pkt_len = MIN(BPF_MIN_PKT_SIZE, in_pkt_len); } tlen = pktap->pth_length + pktap->pth_frame_pre_length + out_pkt_len; } // Verify we do not overflow the buffer if (__improbable(tlen > pkt->bpfp_total_length)) { bool do_panic = bpf_debug != 0 ? true : false; #if DEBUG do_panic = true; #endif /* DEBUG */ if (do_panic) { panic("%s:%d tlen %u > bpfp_total_length %lu bpfp_header_length %lu pth_frame_pre_length %u pre_adjust %u in_pkt_len %u out_pkt_len %u", __func__, __LINE__, tlen, pkt->bpfp_total_length, pkt->bpfp_header_length, pktap->pth_frame_pre_length, pre_adjust, in_pkt_len, out_pkt_len); } else { os_log(OS_LOG_DEFAULT, "%s:%d tlen %u > bpfp_total_length %lu bpfp_header_length %lu pth_frame_pre_length %u pre_adjust %u in_pkt_len %u out_pkt_len %u", __func__, __LINE__, tlen, pkt->bpfp_total_length, pkt->bpfp_header_length, pktap->pth_frame_pre_length, pre_adjust, in_pkt_len, out_pkt_len); } bpf_trunc_overflow += 1; tlen = (uint32_t)pkt->bpfp_total_length; } return tlen; } static uint8_t get_common_prefix_size(const void *__bidi_indexable a, const void *__bidi_indexable b, uint8_t max_bytes) { uint8_t max_words = max_bytes >> 2; const uint32_t *x = (const uint32_t *)a; const uint32_t *y = (const uint32_t *)b; uint8_t i; for (i = 0; i < max_words; i++) { if (x[i] != y[i]) { break; } } return (uint8_t)(i << 2); } /* * Move the packet data from interface memory (pkt) into the * store buffer. Return 1 if it's time to wakeup a listener (buffer full), * otherwise 0. */ static void catchpacket(struct bpf_d *d, struct bpf_packet * pkt, u_int snaplen, int outbound) { struct bpf_hdr *hp; struct bpf_hdr_ext *ehp; uint32_t totlen, curlen; uint32_t hdrlen, caplen; int do_wakeup = 0; u_char *payload; struct timeval tv = { .tv_sec = 0, .tv_usec = 0 }; hdrlen = (d->bd_flags & BPF_EXTENDED_HDR) ? d->bd_bif->bif_exthdrlen : (d->bd_flags & BPF_COMP_REQ) ? d->bd_bif->bif_comphdrlen: d->bd_bif->bif_hdrlen; /* * Figure out how many bytes to move. If the packet is * greater or equal to the snapshot length, transfer that * much. Otherwise, transfer the whole packet (unless * we hit the buffer size limit). */ totlen = hdrlen + MIN(snaplen, (int)pkt->bpfp_total_length); if (totlen > d->bd_bufsize) { totlen = d->bd_bufsize; } if (hdrlen > totlen) { return; } /* * Round up the end of the previous packet to the next longword. */ curlen = BPF_WORDALIGN(d->bd_slen); if (curlen + totlen > d->bd_bufsize) { /* * This packet will overflow the storage buffer. * Rotate the buffers if we can, then wakeup any * pending reads. * * We cannot rotate buffers if a read is in progress * so drop the packet */ if (d->bd_hbuf_read) { ++d->bd_dcount; return; } if (d->bd_fbuf == NULL) { if (d->bd_headdrop == 0) { /* * We haven't completed the previous read yet, * so drop the packet. */ ++d->bd_dcount; return; } /* * Drop the hold buffer as it contains older packets */ d->bd_dcount += d->bd_hcnt; d->bd_fbuf = d->bd_hbuf; ROTATE_BUFFERS(d); } else { ROTATE_BUFFERS(d); } do_wakeup = 1; curlen = 0; } else if (d->bd_immediate || d->bd_state == BPF_TIMED_OUT) { /* * Immediate mode is set, or the read timeout has * already expired during a select call. A packet * arrived, so the reader should be woken up. */ do_wakeup = 1; } /* * Append the bpf header. */ if (d->bd_tstamp != BPF_T_NONE) { microtime(&tv); } if (d->bd_flags & BPF_EXTENDED_HDR) { ehp = (struct bpf_hdr_ext *)(void *)(d->bd_sbuf + curlen); memset(ehp, 0, sizeof(*ehp)); ehp->bh_tstamp.tv_sec = (int)tv.tv_sec; ehp->bh_tstamp.tv_usec = tv.tv_usec; ehp->bh_datalen = (bpf_u_int32)pkt->bpfp_total_length; ehp->bh_hdrlen = (u_short)hdrlen; caplen = ehp->bh_caplen = totlen - hdrlen; payload = (u_char *)ehp + hdrlen; if (outbound) { ehp->bh_flags |= BPF_HDR_EXT_FLAGS_DIR_OUT; } else { ehp->bh_flags |= BPF_HDR_EXT_FLAGS_DIR_IN; } if (pkt->bpfp_type == BPF_PACKET_TYPE_MBUF) { mbuf_ref_t m = pkt->bpfp_mbuf; if (m->m_pkthdr.pkt_ext_flags & PKTF_EXT_ULPN) { ehp->bh_pktflags |= BPF_PKTFLAGS_ULPN; } if (outbound) { /* only do lookups on non-raw INPCB */ if ((m->m_pkthdr.pkt_flags & (PKTF_FLOW_ID | PKTF_FLOW_LOCALSRC | PKTF_FLOW_RAWSOCK)) == (PKTF_FLOW_ID | PKTF_FLOW_LOCALSRC) && m->m_pkthdr.pkt_flowsrc == FLOWSRC_INPCB) { ehp->bh_flowid = m->m_pkthdr.pkt_flowid; if (m->m_pkthdr.pkt_proto == IPPROTO_TCP) { ehp->bh_flags |= BPF_HDR_EXT_FLAGS_TCP; } else if (m->m_pkthdr.pkt_proto == IPPROTO_UDP) { ehp->bh_flags |= BPF_HDR_EXT_FLAGS_UDP; } } ehp->bh_svc = so_svc2tc(m->m_pkthdr.pkt_svc); if (m->m_pkthdr.pkt_flags & PKTF_TCP_REXMT) { ehp->bh_pktflags |= BPF_PKTFLAGS_TCP_REXMT; } if (m->m_pkthdr.pkt_flags & PKTF_START_SEQ) { ehp->bh_pktflags |= BPF_PKTFLAGS_START_SEQ; } if (m->m_pkthdr.pkt_flags & PKTF_LAST_PKT) { ehp->bh_pktflags |= BPF_PKTFLAGS_LAST_PKT; } if (m->m_pkthdr.pkt_flags & PKTF_VALID_UNSENT_DATA) { ehp->bh_unsent_bytes = m->m_pkthdr.bufstatus_if; ehp->bh_unsent_snd = m->m_pkthdr.bufstatus_sndbuf; } ehp->bh_comp_gencnt = m->m_pkthdr.comp_gencnt; } else { if (m->m_pkthdr.pkt_flags & PKTF_WAKE_PKT) { ehp->bh_pktflags |= BPF_PKTFLAGS_WAKE_PKT; } } #if SKYWALK } else { kern_packet_t kern_pkt = pkt->bpfp_pkt; packet_flowid_t flowid = 0; if (kern_packet_get_ulpn_flag(kern_pkt)) { ehp->bh_pktflags |= BPF_PKTFLAGS_ULPN; } if (outbound) { /* * Note: pp_init() asserts that kern_packet_svc_class_t is equivalent * to mbuf_svc_class_t */ ehp->bh_svc = so_svc2tc((mbuf_svc_class_t)kern_packet_get_service_class(kern_pkt)); if (kern_packet_get_transport_retransmit(kern_pkt)) { ehp->bh_pktflags |= BPF_PKTFLAGS_TCP_REXMT; } if (kern_packet_get_transport_last_packet(kern_pkt)) { ehp->bh_pktflags |= BPF_PKTFLAGS_LAST_PKT; } kern_packet_get_compression_generation_count(kern_pkt, &ehp->bh_comp_gencnt); } else { if (kern_packet_get_wake_flag(kern_pkt)) { ehp->bh_pktflags |= BPF_PKTFLAGS_WAKE_PKT; } } ehp->bh_trace_tag = kern_packet_get_trace_tag(kern_pkt); if (kern_packet_get_flowid(kern_pkt, &flowid) == 0) { ehp->bh_flowid = flowid; } #endif /* SKYWALK */ } } else { hp = (struct bpf_hdr *)(void *)(d->bd_sbuf + curlen); memset(hp, 0, BPF_WORDALIGN(sizeof(*hp))); hp->bh_tstamp.tv_sec = (int)tv.tv_sec; hp->bh_tstamp.tv_usec = tv.tv_usec; hp->bh_datalen = (bpf_u_int32)pkt->bpfp_total_length; hp->bh_hdrlen = (u_short)hdrlen; caplen = hp->bh_caplen = totlen - hdrlen; payload = (u_char *)hp + hdrlen; } if (d->bd_flags & BPF_COMP_REQ) { uint8_t common_prefix_size = 0; uint8_t copy_len = MIN((uint8_t)caplen, BPF_HDR_COMP_LEN_MAX); copy_bpf_packet(pkt, (uint8_t *__bidi_indexable)d->bd_prev_fbuf, copy_len); if (d->bd_prev_slen != 0) { common_prefix_size = get_common_prefix_size(d->bd_prev_fbuf, d->bd_prev_sbuf, MIN(copy_len, d->bd_prev_slen)); } if (d->bd_flags & BPF_COMP_ENABLED) { assert3u(caplen, >=, common_prefix_size); copy_bpf_packet_offset(pkt, payload, caplen - common_prefix_size, common_prefix_size); d->bd_slen = curlen + totlen - common_prefix_size; } else { copy_bpf_packet(pkt, payload, caplen); d->bd_slen = curlen + totlen; } /* * Update the caplen only if compression is enabled -- the caller * must pay attention to bpf_hdr_comp_enable */ if (d->bd_flags & BPF_EXTENDED_HDR) { ehp->bh_complen = common_prefix_size; if (d->bd_flags & BPF_COMP_ENABLED) { ehp->bh_caplen -= common_prefix_size; } } else { struct bpf_comp_hdr *hcp; hcp = (struct bpf_comp_hdr *)(void *)(d->bd_sbuf + curlen); hcp->bh_complen = common_prefix_size; if (d->bd_flags & BPF_COMP_ENABLED) { hcp->bh_caplen -= common_prefix_size; } } if (common_prefix_size > 0) { d->bd_bcs.bcs_total_compressed_prefix_size += common_prefix_size; if (common_prefix_size > d->bd_bcs.bcs_max_compressed_prefix_size) { d->bd_bcs.bcs_max_compressed_prefix_size = common_prefix_size; } d->bd_bcs.bcs_count_compressed_prefix += 1; } else { d->bd_bcs.bcs_count_no_common_prefix += 1; } /* The current compression buffer becomes the previous one */ caddr_t tmp = d->bd_prev_sbuf; d->bd_prev_sbuf = d->bd_prev_fbuf; d->bd_prev_slen = copy_len; d->bd_prev_fbuf = tmp; } else { /* * Copy the packet data into the store buffer and update its length. */ copy_bpf_packet(pkt, payload, caplen); d->bd_slen = curlen + totlen; } d->bd_scnt += 1; d->bd_bcs.bcs_total_hdr_size += pkt->bpfp_header_length; d->bd_bcs.bcs_total_size += caplen; if (do_wakeup) { bpf_wakeup(d); } } static void bpf_freebufs(struct bpf_d *d) { if (d->bd_sbuf != NULL) { kfree_data_addr(d->bd_sbuf); } if (d->bd_hbuf != NULL) { kfree_data_addr(d->bd_hbuf); } if (d->bd_fbuf != NULL) { kfree_data_addr(d->bd_fbuf); } if (d->bd_prev_sbuf != NULL) { kfree_data_addr(d->bd_prev_sbuf); } if (d->bd_prev_fbuf != NULL) { kfree_data_addr(d->bd_prev_fbuf); } } /* * Initialize all nonzero fields of a descriptor. */ static int bpf_allocbufs(struct bpf_d *d) { bpf_freebufs(d); d->bd_fbuf = kalloc_data(d->bd_bufsize, Z_WAITOK | Z_ZERO); if (d->bd_fbuf == NULL) { goto nobufs; } d->bd_sbuf = kalloc_data(d->bd_bufsize, Z_WAITOK | Z_ZERO); if (d->bd_sbuf == NULL) { goto nobufs; } d->bd_slen = 0; d->bd_hlen = 0; d->bd_scnt = 0; d->bd_hcnt = 0; d->bd_prev_slen = 0; if (d->bd_flags & BPF_COMP_REQ) { d->bd_prev_sbuf = kalloc_data(BPF_HDR_COMP_LEN_MAX, Z_WAITOK | Z_ZERO); if (d->bd_prev_sbuf == NULL) { goto nobufs; } d->bd_prev_fbuf = kalloc_data(BPF_HDR_COMP_LEN_MAX, Z_WAITOK | Z_ZERO); if (d->bd_prev_fbuf == NULL) { goto nobufs; } } return 0; nobufs: bpf_freebufs(d); return ENOMEM; } /* * Free buffers currently in use by a descriptor. * Called on close. */ static void bpf_freed(struct bpf_d *d) { /* * We don't need to lock out interrupts since this descriptor has * been detached from its interface and it yet hasn't been marked * free. */ if (d->bd_hbuf_read || d->bd_hbuf_write) { panic("bpf buffer freed during read/write"); } bpf_freebufs(d); if (d->bd_filter) { kfree_data_addr_sized_by(d->bd_filter, d->bd_filter_len); } } /* * Attach an interface to bpf. driverp is a pointer to a (struct bpf_if *) * in the driver's softc; dlt is the link layer type; hdrlen is the fixed * size of the link header (variable length headers not yet supported). */ void bpfattach(struct ifnet *ifp, u_int dlt, u_int hdrlen) { bpf_attach(ifp, dlt, hdrlen, NULL, NULL); } errno_t bpf_attach( ifnet_t ifp, u_int32_t dlt, u_int32_t hdrlen, bpf_send_func send, bpf_tap_func tap) { struct bpf_if *bp; struct bpf_if *bp_new; struct bpf_if *bp_before_first = NULL; struct bpf_if *bp_first = NULL; struct bpf_if *bp_last = NULL; boolean_t found; /* * Z_NOFAIL will cause a panic if the allocation fails */ bp_new = kalloc_type(struct bpf_if, Z_WAITOK | Z_NOFAIL | Z_ZERO); lck_mtx_lock(bpf_mlock); /* * Check if this interface/dlt is already attached. Remember the * first and last attachment for this interface, as well as the * element before the first attachment. */ found = FALSE; for (bp = bpf_iflist; bp != NULL; bp = bp->bif_next) { if (bp->bif_ifp != ifp) { if (bp_first != NULL) { /* no more elements for this interface */ break; } bp_before_first = bp; } else { if (bp->bif_dlt == dlt) { found = TRUE; break; } if (bp_first == NULL) { bp_first = bp; } bp_last = bp; } } if (found) { lck_mtx_unlock(bpf_mlock); os_log_error(OS_LOG_DEFAULT, "bpfattach - %s with dlt %d is already attached", if_name(ifp), dlt); kfree_type(struct bpf_if, bp_new); return EEXIST; } bp_new->bif_ifp = ifp; bp_new->bif_dlt = dlt; bp_new->bif_send = send; bp_new->bif_tap = tap; if (bp_first == NULL) { /* No other entries for this ifp */ bp_new->bif_next = bpf_iflist; bpf_iflist = bp_new; } else { if (ifnet_type(ifp) == IFT_ETHER && dlt == DLT_EN10MB) { /* Make this the first entry for this interface */ if (bp_before_first != NULL) { /* point the previous to us */ bp_before_first->bif_next = bp_new; } else { /* we're the new head */ bpf_iflist = bp_new; } bp_new->bif_next = bp_first; } else { /* Add this after the last entry for this interface */ bp_new->bif_next = bp_last->bif_next; bp_last->bif_next = bp_new; } } /* * Compute the length of the bpf header. This is not necessarily * equal to SIZEOF_BPF_HDR because we want to insert spacing such * that the network layer header begins on a longword boundary (for * performance reasons and to alleviate alignment restrictions). */ bp_new->bif_hdrlen = BPF_WORDALIGN(hdrlen + SIZEOF_BPF_HDR) - hdrlen; bp_new->bif_exthdrlen = BPF_WORDALIGN(hdrlen + sizeof(struct bpf_hdr_ext)) - hdrlen; bp_new->bif_comphdrlen = BPF_WORDALIGN(hdrlen + sizeof(struct bpf_comp_hdr)) - hdrlen; /* Take a reference on the interface */ ifnet_reference(ifp); lck_mtx_unlock(bpf_mlock); return 0; } /* * Detach bpf from an interface. This involves detaching each descriptor * associated with the interface, and leaving bd_bif NULL. Notify each * descriptor as it's detached so that any sleepers wake up and get * ENXIO. */ void bpfdetach(struct ifnet *ifp) { struct bpf_if *bp, *bp_prev, *bp_next; struct bpf_d *d; if (bpf_debug != 0) { os_log(OS_LOG_DEFAULT, "%s: %s", __func__, if_name(ifp)); } lck_mtx_lock(bpf_mlock); /* * Build the list of devices attached to that interface * that we need to free while keeping the lock to maintain * the integrity of the interface list */ bp_prev = NULL; for (bp = bpf_iflist; bp != NULL; bp = bp_next) { bp_next = bp->bif_next; if (ifp != bp->bif_ifp) { bp_prev = bp; continue; } /* Unlink from the interface list */ if (bp_prev) { bp_prev->bif_next = bp->bif_next; } else { bpf_iflist = bp->bif_next; } /* Detach the devices attached to the interface */ while ((d = bp->bif_dlist) != NULL) { /* * Take an extra reference to prevent the device * from being freed when bpf_detachd() releases * the reference for the interface list */ bpf_acquire_d(d); /* * Wait for active read and writes to complete */ while (d->bd_hbuf_read || d->bd_hbuf_write) { msleep((caddr_t)d, bpf_mlock, PRINET, "bpfdetach", NULL); } bpf_detachd(d, current_proc()); bpf_wakeup(d); bpf_release_d(d); } ifnet_release(ifp); } lck_mtx_unlock(bpf_mlock); } void bpf_init(__unused void *unused) { int maj; /* bpf_comp_hdr is an overlay of bpf_hdr */ static_assert(BPF_WORDALIGN(sizeof(struct bpf_hdr)) == BPF_WORDALIGN(sizeof(struct bpf_comp_hdr))); /* compression length must fits in a byte */ static_assert(BPF_HDR_COMP_LEN_MAX <= UCHAR_MAX); (void) PE_parse_boot_argn("bpf_hdr_comp", &bpf_hdr_comp_enable, sizeof(bpf_hdr_comp_enable)); if (bpf_devsw_installed == 0) { bpf_devsw_installed = 1; maj = cdevsw_add(CDEV_MAJOR, &bpf_cdevsw); if (maj == -1) { bpf_devsw_installed = 0; os_log_error(OS_LOG_DEFAULT, "bpf_init: failed to allocate a major number"); return; } for (int i = 0; i < NBPFILTER; i++) { bpf_make_dev_t(maj); } } } static int sysctl_bpf_maxbufsize SYSCTL_HANDLER_ARGS { #pragma unused(arg1, arg2) int i, err; i = bpf_maxbufsize; err = sysctl_handle_int(oidp, &i, 0, req); if (err != 0 || req->newptr == USER_ADDR_NULL) { return err; } if (i < 0 || i > BPF_BUFSIZE_CAP) { i = BPF_BUFSIZE_CAP; } bpf_maxbufsize = i; return err; } static int sysctl_bpf_bufsize_cap SYSCTL_HANDLER_ARGS { #pragma unused(arg1, arg2) int i, err; i = BPF_BUFSIZE_CAP; err = sysctl_handle_int(oidp, &i, 0, req); if (err != 0 || req->newptr == USER_ADDR_NULL) { return err; } return err; } /* * Fill filter statistics */ static void bpfstats_fill_xbpf(struct xbpf_d *d, struct bpf_d *bd) { LCK_MTX_ASSERT(bpf_mlock, LCK_MTX_ASSERT_OWNED); d->bd_structsize = sizeof(struct xbpf_d); d->bd_promisc = bd->bd_promisc != 0 ? 1 : 0; d->bd_immediate = d->bd_immediate != 0 ? 1 : 0; d->bd_hdrcmplt = bd->bd_hdrcmplt != 0 ? 1 : 0; d->bd_async = bd->bd_async != 0 ? 1 : 0; d->bd_headdrop = bd->bd_headdrop != 0 ? 1 : 0; d->bd_direction = (uint8_t)bd->bd_direction; d->bh_compreq = bd->bd_flags & BPF_COMP_REQ ? 1 : 0; d->bh_compenabled = bd->bd_flags & BPF_COMP_ENABLED ? 1 : 0; d->bd_exthdr = bd->bd_flags & BPF_EXTENDED_HDR ? 1 : 0; d->bd_trunc = bd->bd_flags & BPF_TRUNCATE ? 1 : 0; d->bd_pkthdrv2 = bd->bd_flags & BPF_PKTHDRV2 ? 1 : 0; d->bd_batch_write = bd->bd_flags & BPF_BATCH_WRITE ? 1 : 0; d->bd_divert_in = bd->bd_flags & BPF_DIVERT_IN ? 1 : 0; d->bd_dev_minor = (uint8_t)bd->bd_dev_minor; d->bd_sig = bd->bd_sig; d->bd_rcount = bd->bd_rcount; d->bd_dcount = bd->bd_dcount; d->bd_fcount = bd->bd_fcount; d->bd_wcount = bd->bd_wcount; d->bd_wdcount = bd->bd_wdcount; d->bd_slen = bd->bd_slen; d->bd_hlen = bd->bd_hlen; d->bd_bufsize = bd->bd_bufsize; d->bd_pid = bd->bd_pid; if (bd->bd_bif != NULL && bd->bd_bif->bif_ifp != NULL) { strlcpy(d->bd_ifname, bd->bd_bif->bif_ifp->if_xname, IFNAMSIZ); } d->bd_comp_count = bd->bd_bcs.bcs_count_compressed_prefix; d->bd_comp_size = bd->bd_bcs.bcs_total_compressed_prefix_size; d->bd_scnt = bd->bd_scnt; d->bd_hcnt = bd->bd_hcnt; d->bd_read_count = bd->bd_bcs.bcs_total_read; d->bd_fsize = bd->bd_bcs.bcs_total_size; } /* * Handle `netstat -B' stats request */ static int sysctl_bpf_stats SYSCTL_HANDLER_ARGS { int error; struct xbpf_d *xbdbuf; unsigned int x_cnt; vm_size_t buf_size; if (req->oldptr == USER_ADDR_NULL) { return SYSCTL_OUT(req, 0, nbpfilter * sizeof(struct xbpf_d)); } if (nbpfilter == 0) { return SYSCTL_OUT(req, 0, 0); } buf_size = req->oldlen; if (buf_size > BPF_MAX_DEVICES * sizeof(struct xbpf_d)) { buf_size = BPF_MAX_DEVICES * sizeof(struct xbpf_d); } xbdbuf = kalloc_data(buf_size, Z_WAITOK | Z_ZERO); lck_mtx_lock(bpf_mlock); if (buf_size < (nbpfilter * sizeof(struct xbpf_d))) { lck_mtx_unlock(bpf_mlock); kfree_data(xbdbuf, buf_size); return ENOMEM; } x_cnt = 0; unsigned int i; for (i = 0; i < nbpfilter; i++) { struct bpf_d *bd = bpf_dtab[i]; struct xbpf_d *xbd; if (bd == NULL || bd == BPF_DEV_RESERVED || (bd->bd_flags & BPF_CLOSING) != 0) { continue; } VERIFY(x_cnt < nbpfilter); xbd = &xbdbuf[x_cnt++]; bpfstats_fill_xbpf(xbd, bd); } lck_mtx_unlock(bpf_mlock); error = SYSCTL_OUT(req, xbdbuf, x_cnt * sizeof(struct xbpf_d)); kfree_data(xbdbuf, buf_size); return error; } |