X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/6601e61aa18bf4f09af135ff61fc7f4771d23b06..a991bd8d3e7fe02dbca0644054bab73c5b75324a:/bsd/net/bpf.c?ds=sidebyside diff --git a/bsd/net/bpf.c b/bsd/net/bpf.c index 3d025ccbc..37d4c7d6a 100644 --- a/bsd/net/bpf.c +++ b/bsd/net/bpf.c @@ -1,23 +1,29 @@ /* - * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2020 Apple Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ - * - * The contents of this file constitute Original Code as defined in and - * are subject to the Apple Public Source License Version 1.1 (the - * "License"). You may not use this file except in compliance with the - * License. Please obtain a copy of the License at - * http://www.apple.com/publicsource and read it before using this file. - * - * This Original Code and all software distributed under the License are - * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER + * @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 OR NON-INFRINGEMENT. Please see the - * License for the specific language governing rights and limitations - * under the License. - * - * @APPLE_LICENSE_HEADER_END@ + * 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 @@ -56,10 +62,16 @@ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * - * @(#)bpf.c 8.2 (Berkeley) 3/28/94 + * @(#)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" @@ -82,13 +94,13 @@ #include #include #include +#include +#include -#if defined(sparc) && BSD < 199103 -#include -#endif #include #include +#include #include #include @@ -96,56 +108,84 @@ #include #include +#include +#include +#include +#include +#include +#include +#include +#include +#include #include +#include +#include #include #include #include -#include #include #include +#include #include +#include +#include -extern int tvtohz(struct timeval *); +#include -#if NBPFILTER > 0 +extern int tvtohz(struct timeval *); -/* - * Older BSDs don't have kernel malloc. - */ -#if BSD < 199103 -extern bcopy(); -static caddr_t bpf_alloc(); -#include -#define BPF_BUFSIZE (MCLBYTES-8) -#define UIOMOVE(cp, len, code, uio) uiomove(cp, len, code, uio) -#else #define BPF_BUFSIZE 4096 #define UIOMOVE(cp, len, code, uio) uiomove(cp, len, uio) -#endif +#define PRINET 26 /* interruptible */ + +#define ISAKMP_HDR_SIZE (sizeof(struct isakmp) + sizeof(struct isakmp_gen)) +#define ESP_HDR_SIZE sizeof(struct newesp) -#define PRINET 26 /* interruptible */ +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, - &bpf_bufsize, 0, ""); -static unsigned int bpf_maxbufsize = BPF_MAXBUFSIZE; -SYSCTL_INT(_debug, OID_AUTO, bpf_maxbufsize, CTLFLAG_RW, - &bpf_maxbufsize, 0, ""); +SYSCTL_INT(_debug, OID_AUTO, bpf_bufsize, CTLFLAG_RW | CTLFLAG_LOCKED, + &bpf_bufsize, 0, ""); + +static int sysctl_bpf_maxbufsize SYSCTL_HANDLER_ARGS; +extern const int copysize_limit_panic; +#define BPF_MAXSIZE_CAP (copysize_limit_panic >> 1) +__private_extern__ unsigned int bpf_maxbufsize = BPF_MAXBUFSIZE; +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"); + static unsigned int bpf_maxdevices = 256; -SYSCTL_UINT(_debug, OID_AUTO, bpf_maxdevices, CTLFLAG_RW, - &bpf_maxdevices, 0, ""); +SYSCTL_UINT(_debug, OID_AUTO, bpf_maxdevices, CTLFLAG_RW | 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, ""); /* * 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; +static struct bpf_if *bpf_iflist; #ifdef __APPLE__ /* * BSD now stores the bpf_d in the dev_t which is a struct @@ -153,88 +193,167 @@ static struct bpf_if *bpf_iflist; * the bpf_d in a separate table indexed by minor device #. * * The value stored in bpf_dtab[n] represent three states: - * 0: device not opened - * 1: device opening or closing + * NULL: device not opened + * BPF_DEV_RESERVED: device opening or closing * other: device opened with pointer to storage */ -static struct bpf_d **bpf_dtab = NULL; +#define BPF_DEV_RESERVED ((struct bpf_d *)(uintptr_t)1) +static struct bpf_d **bpf_dtab = NULL; static unsigned int bpf_dtab_size = 0; -static unsigned int nbpfilter = 0; +static unsigned int nbpfilter = 0; -static lck_mtx_t *bpf_mlock; -static lck_grp_t *bpf_mlock_grp; -static lck_grp_attr_t *bpf_mlock_grp_attr; -static lck_attr_t *bpf_mlock_attr; +decl_lck_mtx_data(static, bpf_mlock_data); +static lck_mtx_t *bpf_mlock = &bpf_mlock_data; +static lck_grp_t *bpf_mlock_grp; +static lck_grp_attr_t *bpf_mlock_grp_attr; +static lck_attr_t *bpf_mlock_attr; -/* - * Mark a descriptor free by making it point to itself. - * This is probably cheaper than marking with a constant since - * the address should be in a register anyway. - */ #endif /* __APPLE__ */ -static int bpf_allocbufs(struct bpf_d *); -static void bpf_attachd(struct bpf_d *d, struct bpf_if *bp); -static void bpf_detachd(struct bpf_d *d); -static void bpf_freed(struct bpf_d *); -static void bpf_mcopy(const void *, void *, size_t); -static int bpf_movein(struct uio *, int, - struct mbuf **, struct sockaddr *, int *); -static int bpf_setif(struct bpf_d *, struct ifreq *); -static void bpf_wakeup(struct bpf_d *); -static void catchpacket(struct bpf_d *, u_char *, u_int, - u_int, void (*)(const void *, void *, size_t)); -static void reset_d(struct bpf_d *); -static int bpf_setf(struct bpf_d *, struct user_bpf_program *); - -/*static void *bpf_devfs_token[MAXBPFILTER];*/ +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, int); +static void bpf_freed(struct bpf_d *); +static int bpf_movein(struct uio *, int, + struct mbuf **, struct sockaddr *, int *); +static int bpf_setif(struct bpf_d *, ifnet_t ifp, bool, bool); +static void bpf_timed_out(void *, void *); +static void bpf_wakeup(struct bpf_d *); +static u_int get_pkt_trunc_len(u_char *, u_int); +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, struct proc *); +static int bpf_setdlt(struct bpf_d *, u_int); +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); -int bpf_tap_callback(struct ifnet *ifp, struct mbuf *m); +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 bpfpoll; - +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 struct cdevsw bpf_cdevsw = { - /* open */ bpfopen, - /* close */ bpfclose, - /* read */ bpfread, - /* write */ bpfwrite, - /* ioctl */ bpfioctl, - /* stop */ eno_stop, - /* reset */ eno_reset, - /* tty */ NULL, - /* select */ bpfpoll, - /* mmap */ eno_mmap, - /* strategy*/ eno_strat, - /* getc */ eno_getc, - /* putc */ eno_putc, - /* type */ 0 +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) +#define SOCKADDR_HDR_LEN offsetof(struct sockaddr, sa_data) static int -bpf_movein(struct uio *uio, int linktype, struct mbuf **mp, struct sockaddr *sockp, int *datlen) +bpf_movein(struct uio *uio, int linktype, struct mbuf **mp, + struct sockaddr *sockp, int *datlen) { struct mbuf *m; int error; int len; + uint8_t sa_family; int hlen; + 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; + } + + // LP64todo - fix this! + len = uio_resid(uio); + *datlen = len - hlen; + if ((unsigned)len > MCLBYTES) { + return EIO; + } + if (sockp) { /* * Build a sockaddr based on the data link layer type. @@ -245,85 +364,27 @@ bpf_movein(struct uio *uio, int linktype, struct mbuf **mp, struct sockaddr *soc * Also, we are careful to leave room at the front of the mbuf * for the link level header. */ - switch (linktype) { - - case DLT_SLIP: - sockp->sa_family = AF_INET; - hlen = 0; - break; - - case DLT_EN10MB: - sockp->sa_family = AF_UNSPEC; - /* XXX Would MAXLINKHDR be better? */ - hlen = sizeof(struct ether_header); - break; - - case DLT_FDDI: - #if defined(__FreeBSD__) || defined(__bsdi__) - sockp->sa_family = AF_IMPLINK; - hlen = 0; - #else - sockp->sa_family = AF_UNSPEC; - /* XXX 4(FORMAC)+6(dst)+6(src)+3(LLC)+5(SNAP) */ - hlen = 24; - #endif - break; - - case DLT_RAW: - case DLT_NULL: - sockp->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. - */ - sockp->sa_family = AF_UNSPEC; - hlen = 12; /* XXX 4(ATM_PH) + 3(LLC) + 5(SNAP) */ - break; - #endif - case DLT_PPP: - sockp->sa_family = AF_UNSPEC; - hlen = 4; /* This should match PPP_HDRLEN */ - break; - - case DLT_APPLE_IP_OVER_IEEE1394: - sockp->sa_family = AF_UNSPEC; - hlen = sizeof(struct firewire_header); - break; - - default: - return (EIO); - } if ((hlen + SOCKADDR_HDR_LEN) > sockp->sa_len) { - return (EIO); + return EIO; } - } - else { + 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; } - - // LP64todo - fix this! - len = uio_resid(uio); - *datlen = len - hlen; - if ((unsigned)len > MCLBYTES) - return (EIO); MGETHDR(m, M_WAIT, MT_DATA); - if (m == 0) - return (ENOBUFS); + if (m == 0) { + return ENOBUFS; + } if ((unsigned)len > MHLEN) { -#if BSD >= 199103 MCLGET(m, M_WAIT); if ((m->m_flags & M_EXT) == 0) { -#else - MCLGET(m); - if (m->m_len != MCLBYTES) { -#endif error = ENOBUFS; goto bad; } @@ -331,95 +392,105 @@ bpf_movein(struct uio *uio, int linktype, struct mbuf **mp, struct sockaddr *soc m->m_pkthdr.len = m->m_len = len; m->m_pkthdr.rcvif = NULL; *mp = m; + /* * Make room for link header. */ if (hlen != 0) { m->m_pkthdr.len -= hlen; m->m_len -= hlen; -#if BSD >= 199103 m->m_data += hlen; /* XXX */ -#else - m->m_off += hlen; -#endif error = UIOMOVE((caddr_t)sockp->sa_data, hlen, UIO_WRITE, uio); - if (error) + if (error) { goto bad; + } } error = UIOMOVE(mtod(m, caddr_t), len - hlen, UIO_WRITE, uio); - if (!error) - return (0); - bad: + if (error) { + goto bad; + } + + /* Check for multicast destination */ + switch (linktype) { + case DLT_EN10MB: { + struct ether_header *eh; + + eh = mtod(m, struct ether_header *); + 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; + } + } + break; + } + } + + return 0; +bad: m_freem(m); - return (error); + return error; } #ifdef __APPLE__ -/* Callback registered with Ethernet driver. */ -int bpf_tap_callback(struct ifnet *ifp, struct mbuf *m) -{ - /* - * Do nothing if the BPF tap has been turned off. - * This is to protect from a potential race where this - * call blocks on the lock. And in the meantime - * BPF is turned off, which will clear if_bpf. - */ - if (ifp->if_bpf) - bpf_mtap(ifp, m); - return 0; -} /* - * 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 + * 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; + static int bpf_growing = 0; + unsigned int cur_size = nbpfilter, i; - if (nbpfilter >= bpf_maxdevices) + if (nbpfilter >= bpf_maxdevices) { return; + } while (bpf_growing) { /* Wait until new device has been created */ - (void)tsleep((caddr_t)&bpf_growing, PZERO, "bpf_growing", 0); + (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) { int new_dtab_size; struct bpf_d **new_dtab = NULL; struct bpf_d **old_dtab = NULL; - - new_dtab_size = bpf_dtab_size + NBPFILTER; - new_dtab = (struct bpf_d **)_MALLOC(sizeof(struct bpf_d *) * new_dtab_size, M_DEVBUF, M_WAIT); + + new_dtab_size = bpf_dtab_size + NBPFILTER; + new_dtab = (struct bpf_d **)_MALLOC( + sizeof(struct bpf_d *) * new_dtab_size, M_DEVBUF, M_WAIT); if (new_dtab == 0) { printf("bpf_make_dev_t: malloc bpf_dtab failed\n"); goto done; } if (bpf_dtab) { - bcopy(bpf_dtab, new_dtab, - sizeof(struct bpf_d *) * bpf_dtab_size); + bcopy(bpf_dtab, new_dtab, + sizeof(struct bpf_d *) * bpf_dtab_size); } - bzero(new_dtab + bpf_dtab_size, - sizeof(struct bpf_d *) * NBPFILTER); + bzero(new_dtab + bpf_dtab_size, + sizeof(struct bpf_d *) * NBPFILTER); old_dtab = bpf_dtab; bpf_dtab = new_dtab; bpf_dtab_size = new_dtab_size; - if (old_dtab != NULL) + if (old_dtab != NULL) { _FREE(old_dtab, M_DEVBUF); + } } i = nbpfilter++; (void) devfs_make_node(makedev(maj, i), - DEVFS_CHAR, UID_ROOT, GID_WHEEL, 0600, - "bpf%d", i); + DEVFS_CHAR, UID_ROOT, GID_WHEEL, 0600, + "bpf%d", i); done: bpf_growing = 0; wakeup((caddr_t)&bpf_growing); @@ -429,11 +500,13 @@ done: /* * Attach file to the bpf interface, i.e. make d listen on bp. - * Must be called at splimp. */ -static void +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 @@ -443,123 +516,341 @@ bpf_attachd(struct bpf_d *d, struct bpf_if *bp) d->bd_next = bp->bif_dlist; bp->bif_dlist = d; - bp->bif_ifp->if_bpf = bp; + /* + * 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); + } + } -#ifdef __APPLE__ - dlil_set_bpf_tap(bp->bif_ifp, BPF_TAP_INPUT_OUTPUT, bpf_tap_callback); -#endif + /* + * 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 void -bpf_detachd(struct bpf_d *d) +static int +bpf_detachd(struct bpf_d *d, int closing) { struct bpf_d **p; struct bpf_if *bp; -#ifdef __APPLE__ struct ifnet *ifp; + 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; -#endif + if (bpf_debug != 0) { + printf("%s: %llx %s%s\n", + __func__, (uint64_t)VM_KERNEL_ADDRPERM(d), + if_name(ifp), closing ? " closing" : ""); + } - 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; + 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); + } + if (bp->bif_tap) { + bp->bif_tap(ifp, bp->bif_dlt, BPF_TAP_DISABLE); + } + + 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; /* * Check if this descriptor had requested promiscuous mode. * If so, turn it off. */ if (d->bd_promisc) { d->bd_promisc = 0; - if (ifnet_set_promiscuous(bp->bif_ifp, 0)) + lck_mtx_unlock(bpf_mlock); + 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. */ - printf("bpf: ifnet_set_promiscuous failed"); + printf("%s: ifnet_set_promiscuous failed\n", __func__); + } + lck_mtx_lock(bpf_mlock); } - /* 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"); + + /* + * 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; + /* + * Note that We've kept the reference because we may have dropped + * the lock when turning off promiscuous mode + */ + bpf_release_d(d); + +done: + /* + * When closing makes sure no other thread refer to the bpf_d + */ + if (bpf_debug != 0) { + printf("%s: %llx done\n", + __func__, (uint64_t)VM_KERNEL_ADDRPERM(d)); } - *p = (*p)->bd_next; - if (bp->bif_dlist == 0) { + /* + * 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( + (uint64_t)tv.tv_sec * USEC_PER_SEC + tv.tv_usec, + NSEC_PER_USEC, &deadline); /* - * Let the driver know that there are no more listeners. + * 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? */ - if (ifp->if_set_bpf_tap) - (*ifp->if_set_bpf_tap)(ifp, BPF_TAP_DISABLE, 0); - d->bd_bif->bif_ifp->if_bpf = 0; + thread_call_enter_delayed(d->bd_thread_call, deadline); + d->bd_state = BPF_WAITING; } - d->bd_bif = 0; } +/* + * 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 *lr_saved = __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 *lr_saved = __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); + } + + _FREE(d, M_DEVBUF); + } +} /* * Open ethernet device. Returns ENXIO for illegal minor device number, * EBUSY if file is open by another process. */ /* ARGSUSED */ - int -bpfopen(dev_t dev, __unused int flags, __unused int fmt, __unused struct proc *p) +int +bpfopen(dev_t dev, int flags, __unused int fmt, + struct proc *p) { - register struct bpf_d *d; - - if ((unsigned int) minor(dev) >= nbpfilter) - 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)) + 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 + * 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. + * 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)] == 0) - bpf_dtab[minor(dev)] = (void *)1; /* Mark opening */ - else - return (EBUSY); - - d = (struct bpf_d *)_MALLOC(sizeof(struct bpf_d), M_DEVBUF, M_WAIT); + 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 = (struct bpf_d *)_MALLOC(sizeof(struct bpf_d), M_DEVBUF, + M_WAIT | M_ZERO); if (d == NULL) { /* this really is a catastrophic failure */ printf("bpfopen: malloc bpf_d failed\n"); - bpf_dtab[minor(dev)] = 0; + bpf_dtab[minor(dev)] = NULL; + lck_mtx_unlock(bpf_mlock); return ENOMEM; } - bzero(d, sizeof(struct bpf_d)); - - /* - * It is not necessary to take the BPF lock here because no other - * thread can access the device until it is marked opened... - */ - + /* Mark "in use" and do most initialization. */ + bpf_acquire_d(d); d->bd_bufsize = bpf_bufsize; d->bd_sig = SIGIO; d->bd_seesent = 1; - bpf_dtab[minor(dev)] = d; /* Mark opened */ + 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) { + printf("bpfopen: malloc thread call failed\n"); + bpf_dtab[minor(dev)] = NULL; + bpf_release_d(d); + lck_mtx_unlock(bpf_mlock); + + return ENOMEM; + } + d->bd_opened_by = p; + uuid_generate(d->bd_uuid); + + bpf_dtab[minor(dev)] = d; /* Mark opened */ + lck_mtx_unlock(bpf_mlock); - return (0); + return 0; } /* @@ -567,50 +858,146 @@ bpfopen(dev_t dev, __unused int flags, __unused int fmt, __unused struct proc *p * deallocating its buffers, and marking it free. */ /* ARGSUSED */ - int -bpfclose(dev_t dev, __unused int flags, __unused int fmt, __unused struct proc *p) +int +bpfclose(dev_t dev, __unused int flags, __unused int fmt, + __unused struct proc *p) { - register struct bpf_d *d; - - d = bpf_dtab[minor(dev)]; - if (d == 0 || d == (void *)1) - return (ENXIO); - - bpf_dtab[minor(dev)] = (void *)1; /* Mark closing */ + struct bpf_d *d; /* Take BPF lock to ensure no other thread is using the device */ lck_mtx_lock(bpf_mlock); - if (d->bd_bif) - bpf_detachd(d); - selthreadclear(&d->bd_sel); - bpf_freed(d); - - lck_mtx_unlock(bpf_mlock); - - /* Mark free in same context as bpfopen comes to check */ - bpf_dtab[minor(dev)] = 0; /* Mark closed */ - _FREE(d, M_DEVBUF); - - return (0); -} + 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; -#define BPF_SLEEP bpf_sleep + if (bpf_debug != 0) { + printf("%s: %llx\n", + __func__, (uint64_t)VM_KERNEL_ADDRPERM(d)); + } -static int -bpf_sleep(struct bpf_d *d, int pri, const char *wmesg, int timo) -{ - register int st; + bpf_dtab[minor(dev)] = BPF_DEV_RESERVED; /* Reserve while closing */ - lck_mtx_unlock(bpf_mlock); - - st = tsleep((caddr_t)d, pri, wmesg, timo); - - lck_mtx_lock(bpf_mlock); - - return st; -} + /* + * 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, 1); + } + selthreadclear(&d->bd_sel); + thread_call_free(d->bd_thread_call); + + while (d->bd_hbuf_read != 0) { + msleep((caddr_t)d, bpf_mlock, PRINET, "bpf_reading", NULL); + } + + 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 @@ -618,48 +1005,78 @@ bpf_sleep(struct bpf_d *d, int pri, const char *wmesg, int timo) * Zero the length of the new store buffer. */ #define ROTATE_BUFFERS(d) \ + if (d->bd_hbuf_read != 0) \ + 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_fbuf = 0; + (d)->bd_scnt = 0; \ + (d)->bd_fbuf = NULL; /* * bpfread - read next chunk of packets from buffers */ - int +int bpfread(dev_t dev, struct uio *uio, int ioflag) { - register struct bpf_d *d; + struct bpf_d *d; + caddr_t hbuf; + int timed_out, hbuf_len; int error; - int s; - - d = bpf_dtab[minor(dev)]; - if (d == 0 || d == (void *)1) - return (ENXIO); + 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. */ - // LP64todo - fix this - if (uio->uio_resid != d->bd_bufsize) { + if (uio_resid(uio) != d->bd_bufsize) { + bpf_release_d(d); lck_mtx_unlock(bpf_mlock); - return (EINVAL); + 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 != 0) { + msleep((caddr_t)d, bpf_mlock, PRINET, "bpf_reading", NULL); } - s = splimp(); + 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 && d->bd_slen != 0) { + if ((d->bd_immediate || timed_out || (ioflag & IO_NDELAY)) && + d->bd_slen != 0) { /* - * A packet(s) either arrived since the previous + * 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. */ @@ -674,20 +1091,64 @@ bpfread(dev_t dev, struct uio *uio, int ioflag) * it before using it again. */ if (d->bd_bif == NULL) { - splx(s); + 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 != 0) { + msleep((caddr_t)d, bpf_mlock, PRINET, "bpf_reading", + NULL); + } + + if ((d->bd_flags & BPF_CLOSING) != 0) { + bpf_release_d(d); lck_mtx_unlock(bpf_mlock); - return (ENXIO); - } - - if (ioflag & IO_NDELAY) - error = EWOULDBLOCK; - else - error = BPF_SLEEP(d, PRINET|PCATCH, "bpf", - d->bd_rtout); + return ENXIO; + } + if (error == EINTR || error == ERESTART) { - splx(s); + 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); - return (error); + if (error == ERESTART) { + printf("%s: %llx ERESTART to EINTR\n", + __func__, (uint64_t)VM_KERNEL_ADDRPERM(d)); + error = EINTR; + } + return error; } if (error == EWOULDBLOCK) { /* @@ -695,18 +1156,19 @@ bpfread(dev_t dev, struct uio *uio, int ioflag) * which may be nothing. If there is something * in the store buffer, we can rotate the buffers. */ - if (d->bd_hbuf) + 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) { - splx(s); + bpf_release_d(d); lck_mtx_unlock(bpf_mlock); - return (0); + return 0; } ROTATE_BUFFERS(d); break; @@ -715,126 +1177,439 @@ bpfread(dev_t dev, struct uio *uio, int ioflag) /* * At this point, we know we have something in the hold slot. */ - splx(s); + + /* + * 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 (). + */ + d->bd_hbuf_read = 1; + hbuf = d->bd_hbuf; + hbuf_len = d->bd_hlen; + flags = d->bd_flags; + lck_mtx_unlock(bpf_mlock); + +#ifdef __APPLE__ + /* + * 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_proto == IPPROTO_TCP) { + found = inp_findinpcb_procinfo(&tcbinfo, + flowid, &soprocinfo); + } else if (ehp->bh_proto == IPPROTO_UDP) { + found = inp_findinpcb_procinfo(&udbinfo, + flowid, &soprocinfo); + } + if (found == 1) { + ehp->bh_pid = soprocinfo.spi_pid; + strlcpy(&ehp->bh_comm[0], &soprocinfo.spi_proc_name[0], sizeof(ehp->bh_comm)); + } + ehp->bh_flowid = 0; + } + + if (flags & BPF_FINALIZE_PKTAP) { + 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; + 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); + } + } +#endif /* * 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(d->bd_hbuf, d->bd_hlen, UIO_READ, uio); + error = UIOMOVE(hbuf, hbuf_len, UIO_READ, 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; + } - s = splimp(); + d->bd_hbuf_read = 0; d->bd_fbuf = d->bd_hbuf; - d->bd_hbuf = 0; + d->bd_hbuf = NULL; d->bd_hlen = 0; - splx(s); + d->bd_hcnt = 0; + wakeup((caddr_t)d); + + bpf_release_d(d); lck_mtx_unlock(bpf_mlock); - return (error); + 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, 0); + if (d->bd_async && d->bd_sig && d->bd_sigio) { + pgsigio(d->bd_sigio, d->bd_sig); + } -#if BSD >= 199103 selwakeup(&d->bd_sel); -#ifndef __APPLE__ - /* XXX */ - d->bd_sel.si_pid = 0; -#endif -#else - if (d->bd_selproc) { - selwakeup(d->bd_selproc, (int)d->bd_selcoll); - d->bd_selcoll = 0; - d->bd_selproc = 0; + if ((d->bd_flags & BPF_KNOTE)) { + KNOTE(&d->bd_sel.si_note, 1); } -#endif +} + +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)) +#define MAX_DATALINK_HDR_LEN (sizeof(struct firewire_header)) - int +int bpfwrite(dev_t dev, struct uio *uio, __unused int ioflag) { - register struct bpf_d *d; + struct bpf_d *d; struct ifnet *ifp; - struct mbuf *m; + struct mbuf *m = NULL; int error; - char dst_buf[SOCKADDR_HDR_LEN + MAX_DATALINK_HDR_LEN]; - int datlen; + char dst_buf[SOCKADDR_HDR_LEN + MAX_DATALINK_HDR_LEN]; + int datlen = 0; + int bif_dlt; + int bd_hdrcmplt; - d = bpf_dtab[minor(dev)]; - if (d == 0 || d == (void *)1) - return (ENXIO); - 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 == 0) { + bpf_release_d(d); lck_mtx_unlock(bpf_mlock); - return (ENXIO); + return ENXIO; } ifp = d->bd_bif->bif_ifp; - if (uio->uio_resid == 0) { + if ((ifp->if_flags & IFF_UP) == 0) { + bpf_release_d(d); + lck_mtx_unlock(bpf_mlock); + return ENETDOWN; + } + if (uio_resid(uio) == 0) { + bpf_release_d(d); lck_mtx_unlock(bpf_mlock); - return (0); + return 0; } ((struct sockaddr *)dst_buf)->sa_len = sizeof(dst_buf); - error = bpf_movein(uio, (int)d->bd_bif->bif_dlt, &m, - d->bd_hdrcmplt ? 0 : (struct sockaddr *)dst_buf, &datlen); + + /* + * fix for PR-6849527 + * geting variables onto stack before dropping lock for bpf_movein() + */ + bif_dlt = (int)d->bd_bif->bif_dlt; + bd_hdrcmplt = d->bd_hdrcmplt; + + /* bpf_movein allocating mbufs; drop lock */ + lck_mtx_unlock(bpf_mlock); + + error = bpf_movein(uio, bif_dlt, &m, + bd_hdrcmplt ? NULL : (struct sockaddr *)dst_buf, + &datlen); + + /* take the lock again */ + lck_mtx_lock(bpf_mlock); if (error) { + bpf_release_d(d); + lck_mtx_unlock(bpf_mlock); + return error; + } + + /* verify the device is still open */ + if ((d->bd_flags & BPF_CLOSING) != 0) { + bpf_release_d(d); + lck_mtx_unlock(bpf_mlock); + m_freem(m); + return ENXIO; + } + + if (d->bd_bif == NULL) { + bpf_release_d(d); lck_mtx_unlock(bpf_mlock); - return (error); + m_free(m); + return ENXIO; } if ((unsigned)datlen > ifp->if_mtu) { + bpf_release_d(d); lck_mtx_unlock(bpf_mlock); - return (EMSGSIZE); + m_freem(m); + return EMSGSIZE; } + bpf_set_packet_service_class(m, d->bd_traffic_class); + lck_mtx_unlock(bpf_mlock); - if (d->bd_hdrcmplt) { - error = dlil_output(ifp, 0, m, NULL, NULL, 1); - } - else { - error = dlil_output(ifp, PF_INET, m, NULL, (struct sockaddr *)dst_buf, 0); - } - /* * The driver frees the mbuf. */ - return (error); + if (d->bd_hdrcmplt) { + if (d->bd_bif->bif_send) { + error = d->bd_bif->bif_send(ifp, d->bd_bif->bif_dlt, m); + } else { + error = dlil_output(ifp, 0, m, NULL, NULL, 1, NULL); + } + } else { + error = dlil_output(ifp, PF_INET, m, NULL, + (struct sockaddr *)dst_buf, 0, NULL); + } + + lck_mtx_lock(bpf_mlock); + 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. Should be called at splimp. + * receive and drop counts. */ static void reset_d(struct bpf_d *d) { + if (d->bd_hbuf_read != 0) { + panic("resetting buffers during read"); + } + if (d->bd_hbuf) { /* Free the hold buffer. */ d->bd_fbuf = d->bd_hbuf; - d->bd_hbuf = 0; + 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; } +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 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_info(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_info(OS_LOG_DEFAULT, + "%s: processes not matching error %d", + __func__, error); + return error; + } + + /* + * Prevent any read while copying + */ + while (d_to->bd_hbuf_read != 0) { + msleep((caddr_t)d_to, bpf_mlock, PRINET, __func__, NULL); + } + d_to->bd_hbuf_read = 1; + + while (d_from->bd_hbuf_read != 0) { + msleep((caddr_t)d_from, bpf_mlock, PRINET, __func__, NULL); + } + d_from->bd_hbuf_read = 1; + + /* + * Verify the devices have not been closed + */ + if (d_to->bd_flags & BPF_CLOSING) { + error = ENXIO; + os_log_info(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_info(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_info(OS_LOG_DEFAULT, + "%s: bufsizes not matching error %d", + __func__, error); + goto done; + } + + /* + * Attach to the interface + */ + error = bpf_setif(d_to, ifp, false, true); + if (error != 0) { + os_log_info(OS_LOG_DEFAULT, + "%s: bpf_setif() failed error %d", + __func__, error); + 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 (bpf_debug > 0) { + os_log_info(OS_LOG_DEFAULT, + "%s: done slen %u scnt %u hlen %u hcnt %u", + __func__, d_to->bd_slen, d_to->bd_scnt, + d_to->bd_hlen, d_to->bd_hcnt); + } +done: + d_from->bd_hbuf_read = 0; + wakeup((caddr_t)d_from); + + d_to->bd_hbuf_read = 0; + wakeup((caddr_t)d_to); + + return error; +} + /* * FIONREAD Check for read packet available. * SIOCGIFADDR Get interface address - convenient hook to driver. @@ -854,22 +1629,39 @@ reset_d(struct bpf_d *d) * 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 addr, __unused int flags, struct proc *p) +bpfioctl(dev_t dev, u_long cmd, caddr_t addr, __unused int flags, + struct proc *p) { - register struct bpf_d *d; - int s, error = 0; + 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 == 0 || d == (void *)1) - return (ENXIO); + if (d == NULL || d == BPF_DEV_RESERVED || + (d->bd_flags & BPF_CLOSING) != 0) { + lck_mtx_unlock(bpf_mlock); + return ENXIO; + } - lck_mtx_lock(bpf_mlock); + bpf_acquire_d(d); - switch (cmd) { + if (d->bd_state == BPF_WAITING) { + bpf_stop_timer(d); + } + d->bd_state = BPF_IDLE; + switch (cmd) { default: error = EINVAL; break; @@ -877,86 +1669,119 @@ bpfioctl(dev_t dev, u_long cmd, caddr_t addr, __unused int flags, struct proc *p /* * Check for read packet available. */ - case FIONREAD: - { - int n; - - s = splimp(); - n = d->bd_slen; - if (d->bd_hbuf) - n += d->bd_hlen; - splx(s); + case FIONREAD: /* int */ + { + int n; - *(int *)addr = n; - break; + n = d->bd_slen; + if (d->bd_hbuf && d->bd_hbuf_read == 0) { + n += d->bd_hlen; } - case SIOCGIFADDR: - { - struct ifnet *ifp; + 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 = dlil_ioctl(0, ifp, cmd, addr); - } - break; + 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 *)addr = d->bd_bufsize; + case BIOCGBLEN: /* u_int */ + bcopy(&d->bd_bufsize, addr, sizeof(u_int)); break; /* * Set buffer length. */ - case BIOCSBLEN: -#if BSD < 199103 - error = EINVAL; -#else - if (d->bd_bif != 0) + case BIOCSBLEN: { /* u_int */ + u_int size; + unsigned int maxbufsize = bpf_maxbufsize; + + /* + * Allow larger buffer in head drop mode to with the + * assumption the reading process may be low priority but + * is interested in the most recent traffic + */ + if (d->bd_headdrop != 0) { + maxbufsize = 2 * bpf_maxbufsize; + } + + if (d->bd_bif != 0 || (d->bd_flags & BPF_DETACHING)) { + /* + * Interface already attached, unable to change buffers + */ error = EINVAL; - else { - register u_int size = *(u_int *)addr; + break; + } + bcopy(addr, &size, sizeof(size)); + + if (size > maxbufsize) { + d->bd_bufsize = maxbufsize; - if (size > bpf_maxbufsize) - *(u_int *)addr = size = bpf_maxbufsize; - else if (size < BPF_MINBUFSIZE) - *(u_int *)addr = size = BPF_MINBUFSIZE; + os_log_info(OS_LOG_DEFAULT, + "%s bufsize capped to %u from %u", + __func__, d->bd_bufsize, size); + } else if (size < BPF_MINBUFSIZE) { + d->bd_bufsize = BPF_MINBUFSIZE; + + os_log_info(OS_LOG_DEFAULT, + "%s bufsize bumped to %u from %u", + __func__, d->bd_bufsize, size); + } else { d->bd_bufsize = size; } -#endif - break; + /* It's a read/write ioctl */ + bcopy(&d->bd_bufsize, addr, sizeof(u_int)); + break; + } /* * Set link layer read filter. */ - case BIOCSETF: - if (proc_is64bit(p)) { - error = bpf_setf(d, (struct user_bpf_program *)addr); - } - else { - struct bpf_program * tmpp; - struct user_bpf_program tmp; + case BIOCSETF32: + case BIOCSETFNR32: { /* struct bpf_program32 */ + struct bpf_program32 prg32; - tmpp = (struct bpf_program *)addr; - tmp.bf_len = tmpp->bf_len; - tmp.bf_insns = CAST_USER_ADDR_T(tmpp->bf_insns); - error = bpf_setf(d, &tmp); - } + 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, prg64.bf_insns, cmd); break; + } /* * Flush read packet buffer. */ case BIOCFLUSH: - s = splimp(); + while (d->bd_hbuf_read != 0) { + msleep((caddr_t)d, bpf_mlock, PRINET, "bpf_reading", + NULL); + } + if ((d->bd_flags & BPF_CLOSING) != 0) { + error = ENXIO; + break; + } reset_d(d); - splx(s); break; /* @@ -970,136 +1795,232 @@ bpfioctl(dev_t dev, u_long cmd, caddr_t addr, __unused int flags, struct proc *p error = EINVAL; break; } - s = splimp(); if (d->bd_promisc == 0) { + lck_mtx_unlock(bpf_mlock); error = ifnet_set_promiscuous(d->bd_bif->bif_ifp, 1); - if (error == 0) + lck_mtx_lock(bpf_mlock); + if (error == 0) { d->bd_promisc = 1; + } } - splx(s); break; /* * Get device parameters. */ - case BIOCGDLT: - if (d->bd_bif == 0) + case BIOCGDLT: /* u_int */ + if (d->bd_bif == 0) { + error = EINVAL; + } else { + 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, p); + } + break; + + /* + * Set data link type. + */ + case BIOCSDLT: /* u_int */ + if (d->bd_bif == NULL) { error = EINVAL; - else - *(u_int *)addr = d->bd_bif->bif_dlt; + } 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); + } break; /* * Get interface name. */ - case BIOCGETIF: - if (d->bd_bif == 0) + case BIOCGETIF: /* struct ifreq */ + if (d->bd_bif == 0) { error = EINVAL; - else { + } else { struct ifnet *const ifp = d->bd_bif->bif_ifp; - struct ifreq *const ifr = (struct ifreq *)addr; - snprintf(ifr->ifr_name, sizeof(ifr->ifr_name), - "%s%d", ifp->if_name, ifp->if_unit); + snprintf(((struct ifreq *)(void *)addr)->ifr_name, + sizeof(ifr.ifr_name), "%s", if_name(ifp)); } break; /* * Set interface. */ - case BIOCSETIF: - error = bpf_setif(d, (struct ifreq *)addr); + case BIOCSETIF: { /* struct ifreq */ + ifnet_t ifp; + + bcopy(addr, &ifr, sizeof(ifr)); + ifr.ifr_name[IFNAMSIZ - 1] = '\0'; + ifp = ifunit(ifr.ifr_name); + if (ifp == NULL) { + error = ENXIO; + } else { + error = bpf_setif(d, ifp, true, false); + } break; + } /* * Set read timeout. */ - case BIOCSRTIMEOUT: - { - struct timeval *tv = (struct timeval *)addr; + case BIOCSRTIMEOUT32: { /* struct user32_timeval */ + struct user32_timeval _tv; + struct timeval tv; - /* - * 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; + 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 = _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 BIOCGRTIMEOUT: - { - struct timeval *tv = (struct timeval *)addr; + case BIOCGRTIMEOUT32: { /* struct user32_timeval */ + struct user32_timeval tv; - tv->tv_sec = d->bd_rtout / hz; - tv->tv_usec = (d->bd_rtout % hz) * tick; - break; - } + 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 *bs = (struct bpf_stat *)addr; + case BIOCGSTATS: { /* struct bpf_stat */ + struct bpf_stat bs; - bs->bs_recv = d->bd_rcount; - bs->bs_drop = d->bd_dcount; - break; - } + bzero(&bs, sizeof(bs)); + bs.bs_recv = d->bd_rcount; + bs.bs_drop = d->bd_dcount; + bcopy(&bs, addr, sizeof(bs)); + break; + } /* * Set immediate mode. */ - case BIOCIMMEDIATE: - d->bd_immediate = *(u_int *)addr; + case BIOCIMMEDIATE: /* u_int */ + d->bd_immediate = *(u_int *)(void *)addr; break; - case BIOCVERSION: - { - struct bpf_version *bv = (struct bpf_version *)addr; + case BIOCVERSION: { /* struct bpf_version */ + struct bpf_version bv; - bv->bv_major = BPF_MAJOR_VERSION; - bv->bv_minor = BPF_MINOR_VERSION; - break; - } + 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 *)addr = d->bd_hdrcmplt; + case BIOCGHDRCMPLT: /* u_int */ + bcopy(&d->bd_hdrcmplt, addr, sizeof(u_int)); break; /* * Set "header already complete" flag */ - case BIOCSHDRCMPLT: - d->bd_hdrcmplt = *(u_int *)addr ? 1 : 0; + case BIOCSHDRCMPLT: /* u_int */ + bcopy(addr, &int_arg, sizeof(int_arg)); + d->bd_hdrcmplt = int_arg ? 1 : 0; break; /* * Get "see sent packets" flag */ - case BIOCGSEESENT: - *(u_int *)addr = d->bd_seesent; + case BIOCGSEESENT: /* u_int */ + bcopy(&d->bd_seesent, addr, sizeof(u_int)); break; /* * Set "see sent packets" flag */ - case BIOCSSEESENT: - d->bd_seesent = *(u_int *)addr; + case BIOCSSEESENT: /* u_int */ + bcopy(addr, &d->bd_seesent, sizeof(u_int)); + break; + + /* + * Set traffic service class + */ + case BIOCSETTC: { /* int */ + int tc; + + bcopy(addr, &tc, sizeof(int)); + error = bpf_set_traffic_class(d, tc); + break; + } + + /* + * Get traffic service class + */ + case BIOCGETTC: /* int */ + bcopy(&d->bd_traffic_class, addr, sizeof(int)); break; - case FIONBIO: /* Non-blocking I/O */ + case FIONBIO: /* Non-blocking I/O; int */ break; - case FIOASYNC: /* Send signal on receive packets */ - d->bd_async = *(int *)addr; + case FIOASYNC: /* Send signal on receive packets; int */ + bcopy(addr, &d->bd_async, sizeof(int)); break; #ifndef __APPLE__ case FIOSETOWN: @@ -1120,288 +2041,1253 @@ bpfioctl(dev_t dev, u_long cmd, caddr_t addr, __unused int flags, struct proc *p *(int *)addr = -fgetown(d->bd_sigio); break; #endif - case BIOCSRSIG: /* Set receive signal */ - { - u_int sig; + 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 */ + bcopy(&d->bd_sig, addr, sizeof(u_int)); + break; +#ifdef __APPLE__ + 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(ifr.ifr_name); + 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; +#endif + + case BIOCSHEADDROP: + bcopy(addr, &int_arg, sizeof(int_arg)); + d->bd_headdrop = int_arg ? 1 : 0; + break; + + case BIOCGHEADDROP: + bcopy(&d->bd_headdrop, addr, sizeof(int)); + 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; - sig = *(u_int *)addr; + case BIOCGETUUID: + bcopy(&d->bd_uuid, addr, sizeof(uuid_t)); + break; - if (sig >= NSIG) - error = EINVAL; - else - d->bd_sig = sig; + 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(bsa.bsa_ifname); + if (ifp == NULL) { + error = ENXIO; + os_log_info(OS_LOG_DEFAULT, + "%s: ifnet not found for %s error %d", + __func__, bsa.bsa_ifname, error); break; } - case BIOCGRSIG: - *(u_int *)addr = d->bd_sig; + + error = bpf_setup(d, bsa.bsa_uuid, ifp); + 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)); + break; + } + + 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 != 0) { + msleep((caddr_t)d, bpf_mlock, PRINET, "bpf_reading", 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; + reset_d(d); + if (old != 0) { + FREE(old, M_DEVBUF); + } + return 0; + } + flen = bf_len; + if (flen > BPF_MAXINSNS) { + return EINVAL; + } + + size = flen * sizeof(struct bpf_insn); + fcode = (struct bpf_insn *) _MALLOC(size, M_DEVBUF, M_WAIT); +#ifdef __APPLE__ + if (fcode == NULL) { + return ENOBUFS; + } +#endif + if (copyin(bf_insns, (caddr_t)fcode, size) == 0 && + bpf_validate(fcode, (int)flen)) { + d->bd_filter = fcode; + + if (cmd == BIOCSETF32 || cmd == BIOCSETF64) { + reset_d(d); + } + + if (old != 0) { + FREE(old, M_DEVBUF); + } + + return 0; + } + FREE(fcode, M_DEVBUF); + 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) +{ + struct bpf_if *bp; + int error; + + while (d->bd_hbuf_read != 0 && !has_hbuf_read) { + msleep((caddr_t)d, bpf_mlock, PRINET, "bpf_reading", 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. + */ + 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, 0) != 0) { + return ENXIO; + } + } + if (bpf_attachd(d, bp) != 0) { + return ENXIO; + } + } + if (do_reset) { + reset_d(d); + } + 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 addr, struct proc *p) +{ + 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(p)) { + 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) +{ + int error, opromisc; + struct ifnet *ifp; + struct bpf_if *bp; + + if (d->bd_bif->bif_dlt == dlt) { + return 0; + } + + while (d->bd_hbuf_read != 0) { + msleep((caddr_t)d, bpf_mlock, PRINET, "bpf_reading", 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, 0) != 0) { + return ENXIO; + } + error = bpf_attachd(d, bp); + if (error) { + printf("bpf_setdlt: bpf_attachd %s%d failed (%d)\n", + ifnet_name(bp->bif_ifp), ifnet_unit(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) { + printf("%s: ifpromisc %s%d failed (%d)\n", + __func__, ifnet_name(bp->bif_ifp), + ifnet_unit(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 *p) +{ + 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 != 0) { + msleep((caddr_t)d, bpf_mlock, PRINET, "bpf_reading", 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(p, &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 != 0 ? + 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 != 0) && + 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_hook = d; + kn->kn_filtid = EVFILTID_BPFREAD; + 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 *)kn->kn_hook; + + 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 *)kn->kn_hook; + + 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 *)kn->kn_hook; + 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 *)kn->kn_hook; + 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, void *dst_arg, size_t len) +{ + u_int count; + u_char *dst; + + dst = dst_arg; + while (len > 0) { + if (m == 0) { + panic("bpf_mcopy"); + } + count = min(m->m_len, len); + bcopy(mbuf_data(m), dst, count); + m = m->m_next; + dst += count; + len -= count; + } +} + +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; d = d->bd_next) { + struct bpf_packet *bpf_pkt_saved = bpf_pkt; + struct bpf_packet bpf_pkt_tmp; + struct pktap_header_buffer bpfp_header_tmp; + + if (outbound && !d->bd_seesent) { + continue; + } + + ++d->bd_rcount; + slen = bpf_filter(d->bd_filter, (u_char *)bpf_pkt, + bpf_pkt->bpfp_total_length, 0); + if (bp->bif_ifp->if_type == IFT_PKTAP && + bp->bif_dlt == DLT_PKTAP) { + /* + * 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; + + convert_to_pktap_header_to_v2(bpf_pkt, + !!(d->bd_flags & BPF_TRUNCATE)); + } + + if (d->bd_flags & BPF_TRUNCATE) { + slen = min(slen, + get_pkt_trunc_len((u_char *)bpf_pkt, + bpf_pkt->bpfp_total_length)); + } + } + if (slen != 0) { + 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* hdr, + size_t hlen, + int outbound) +{ + struct bpf_packet bpf_pkt; + struct mbuf *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; + } + bpf_pkt.bpfp_header = hdr; + if (hdr != NULL) { + bpf_pkt.bpfp_total_length += hlen; + bpf_pkt.bpfp_header_length = hlen; + } else { + 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* 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* 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; +} + + +static errno_t +bpf_copydata(struct bpf_packet *pkt, size_t off, size_t len, void* out_data) +{ + errno_t err = 0; + if (pkt->bpfp_type == BPF_PACKET_TYPE_MBUF) { + err = mbuf_copydata(pkt->bpfp_mbuf, off, len, out_data); + } else { + err = EINVAL; + } + + return err; +} + +static void +copy_bpf_packet(struct bpf_packet * pkt, void * dst, size_t len) +{ + /* copy the optional header */ + if (pkt->bpfp_header_length != 0) { + size_t count = min(len, pkt->bpfp_header_length); + bcopy(pkt->bpfp_header, dst, count); + len -= count; + dst += count; + } + 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); + break; + default: + break; + } +} + +static uint16_t +get_esp_trunc_len(__unused struct bpf_packet *pkt, __unused uint16_t off, + const uint16_t remaining_caplen) +{ + /* + * For some reason tcpdump expects to have one byte beyond the ESP header + */ + uint16_t trunc_len = ESP_HDR_SIZE + 1; + + if (trunc_len > remaining_caplen) { + return remaining_caplen; + } + + return trunc_len; +} + +static uint16_t +get_isakmp_trunc_len(__unused struct bpf_packet *pkt, __unused uint16_t off, + const uint16_t remaining_caplen) +{ + /* + * Include the payload generic header + */ + uint16_t trunc_len = ISAKMP_HDR_SIZE; + + if (trunc_len > remaining_caplen) { + return remaining_caplen; + } + + return trunc_len; +} + +static uint16_t +get_isakmp_natt_trunc_len(struct bpf_packet *pkt, uint16_t off, + const uint16_t remaining_caplen) +{ + int err = 0; + uint16_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 uint16_t +get_udp_trunc_len(struct bpf_packet *pkt, uint16_t off, const uint16_t remaining_caplen) +{ + int err = 0; + uint16_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 uint16_t +get_tcp_trunc_len(struct bpf_packet *pkt, uint16_t off, const uint16_t remaining_caplen) +{ + int err = 0; + uint16_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 = tcphdr.th_off << 2; + } + if (trunc_len >= remaining_caplen) { + return remaining_caplen; + } + + return trunc_len; +} + +static uint16_t +get_proto_trunc_len(uint8_t proto, struct bpf_packet *pkt, uint16_t off, const uint16_t remaining_caplen) +{ + uint16_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; } - - 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, struct user_bpf_program *fp) -{ - struct bpf_insn *fcode, *old; - u_int flen, size; - int s; - - old = d->bd_filter; - if (fp->bf_insns == USER_ADDR_NULL) { - if (fp->bf_len != 0) - return (EINVAL); - s = splimp(); - d->bd_filter = 0; - reset_d(d); - splx(s); - if (old != 0) - FREE((caddr_t)old, M_DEVBUF); - return (0); + default: { + /* + * By default we only include the IP header + */ + trunc_len = 0; + break; } - flen = fp->bf_len; - if (flen > BPF_MAXINSNS) - return (EINVAL); - - size = flen * sizeof(struct bpf_insn); - fcode = (struct bpf_insn *) _MALLOC(size, M_DEVBUF, M_WAIT); -#ifdef __APPLE__ - if (fcode == NULL) - return (ENOBUFS); -#endif - if (copyin(fp->bf_insns, (caddr_t)fcode, size) == 0 && - bpf_validate(fcode, (int)flen)) { - s = splimp(); - d->bd_filter = fcode; - reset_d(d); - splx(s); - if (old != 0) - FREE((caddr_t)old, M_DEVBUF); - - return (0); } - FREE((caddr_t)fcode, M_DEVBUF); - return (EINVAL); + if (trunc_len >= remaining_caplen) { + return remaining_caplen; + } + + return trunc_len; } -/* - * 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, struct ifreq *ifr) +static uint16_t +get_ip_trunc_len(struct bpf_packet *pkt, uint16_t off, const uint16_t remaining_caplen) { - struct bpf_if *bp; - int s, error; - struct ifnet *theywant; + int err = 0; + uint16_t iplen = sizeof(struct ip); + if (iplen >= remaining_caplen) { + return remaining_caplen; + } - theywant = ifunit(ifr->ifr_name); - if (theywant == 0) - return ENXIO; + struct ip iphdr; + err = bpf_copydata(pkt, off, sizeof(struct ip), &iphdr); + if (err != 0) { + return remaining_caplen; + } - /* - * Look through attached interfaces for the named one. - */ - for (bp = bpf_iflist; bp != 0; bp = bp->bif_next) { - struct ifnet *ifp = bp->bif_ifp; + uint8_t proto = 0; - if (ifp == 0 || ifp != theywant) - continue; - /* - * We found the requested interface. - * If it's not up, return an error. - * Allocate the packet buffers if we need to. - * If we're already attached to requested interface, - * just flush the buffer. - */ - if ((ifp->if_flags & IFF_UP) == 0) - return (ENETDOWN); + iplen = iphdr.ip_hl << 2; + if (iplen >= remaining_caplen) { + return remaining_caplen; + } - if (d->bd_sbuf == 0) { - error = bpf_allocbufs(d); - if (error != 0) - return (error); - } - s = splimp(); - if (bp != d->bd_bif) { - if (d->bd_bif) - /* - * Detach if attached to something else. - */ - bpf_detachd(d); + proto = iphdr.ip_p; + iplen += get_proto_trunc_len(proto, pkt, off + iplen, remaining_caplen - iplen); - bpf_attachd(d, bp); - } - reset_d(d); - splx(s); - return (0); + if (iplen >= remaining_caplen) { + return remaining_caplen; } - /* Not found. */ - return (ENXIO); + + return iplen; } -/* - * Support for select() and poll() system calls - * - * Return true iff the specific operation will not block indefinitely. - * Otherwise, return false but make a note that a selwakeup() must be done. - */ -int -bpfpoll(dev_t dev, int events, void * wql, struct proc *p) +static uint16_t +get_ip6_trunc_len(struct bpf_packet *pkt, uint16_t off, const uint16_t remaining_caplen) { - register struct bpf_d *d; - register int s; - int revents = 0; + int err = 0; + uint16_t iplen = sizeof(struct ip6_hdr); + if (iplen >= remaining_caplen) { + return remaining_caplen; + } - d = bpf_dtab[minor(dev)]; - if (d == 0 || d == (void *)1) - return (ENXIO); + struct ip6_hdr ip6hdr; + err = bpf_copydata(pkt, off, sizeof(struct ip6_hdr), &ip6hdr); + if (err != 0) { + return remaining_caplen; + } - lck_mtx_lock(bpf_mlock); + uint8_t proto = 0; /* - * An imitation of the FIONREAD ioctl code. + * TBD: process the extension headers */ - if (d->bd_bif == NULL) { - lck_mtx_unlock(bpf_mlock); - return (ENXIO); - } + proto = ip6hdr.ip6_nxt; + iplen += get_proto_trunc_len(proto, pkt, off + iplen, remaining_caplen - iplen); - s = splimp(); - if (events & (POLLIN | POLLRDNORM)) { - if (d->bd_hlen != 0 || (d->bd_immediate && d->bd_slen != 0)) - revents |= events & (POLLIN | POLLRDNORM); - else - selrecord(p, &d->bd_sel, wql); + if (iplen >= remaining_caplen) { + return remaining_caplen; } - splx(s); - lck_mtx_unlock(bpf_mlock); - return (revents); + return iplen; } -/* - * Incoming linkage from device drivers. Process the packet pkt, of length - * pktlen, which is stored in a contiguous buffer. The packet is parsed - * by each process' filter, and if accepted, stashed into the corresponding - * buffer. - */ -void -bpf_tap(struct ifnet *ifp, u_char *pkt, u_int pktlen) +static uint16_t +get_ether_trunc_len(struct bpf_packet *pkt, int off, const uint16_t remaining_caplen) { - struct bpf_if *bp; - register struct bpf_d *d; - register u_int slen; - /* - * Note that the ipl does not have to be raised at this point. - * The only problem that could arise here is that if two different - * interfaces shared any data. This is not the case. - */ - lck_mtx_lock(bpf_mlock); - - bp = ifp->if_bpf; -#ifdef __APPLE__ - if (bp) { -#endif - for (d = bp->bif_dlist; d != 0; d = d->bd_next) { - ++d->bd_rcount; - slen = bpf_filter(d->bd_filter, pkt, pktlen, pktlen); - if (slen != 0) - catchpacket(d, pkt, pktlen, slen, bcopy); - } -#ifdef __APPLE__ - } - lck_mtx_unlock(bpf_mlock); -#endif -} + int err = 0; + uint16_t ethlen = sizeof(struct ether_header); + if (ethlen >= remaining_caplen) { + return remaining_caplen; + } -/* - * Copy data from an mbuf chain into a buffer. This code is derived - * from m_copydata in sys/uipc_mbuf.c. - */ -static void -bpf_mcopy(const void *src_arg, void *dst_arg, size_t len) -{ - const struct mbuf *m; - u_int count; - u_char *dst; + struct ether_header eh; + u_short type; + err = bpf_copydata(pkt, off, sizeof(struct ether_header), &eh); + if (err != 0) { + return remaining_caplen; + } - m = src_arg; - dst = dst_arg; - while (len > 0) { - if (m == 0) - panic("bpf_mcopy"); - count = min(m->m_len, len); - bcopy(mtod(m, const void *), dst, count); - m = m->m_next; - dst += count; - len -= count; + type = EXTRACT_SHORT(&eh.ether_type); + /* Include full ARP */ + if (type == ETHERTYPE_ARP) { + ethlen = remaining_caplen; + } else if (type != ETHERTYPE_IP && type != ETHERTYPE_IPV6) { + ethlen = min(BPF_MIN_PKT_SIZE, remaining_caplen); + } else { + if (type == ETHERTYPE_IP) { + ethlen += get_ip_trunc_len(pkt, sizeof(struct ether_header), + remaining_caplen); + } else if (type == ETHERTYPE_IPV6) { + ethlen += get_ip6_trunc_len(pkt, sizeof(struct ether_header), + remaining_caplen); + } } + return ethlen; } -/* - * Incoming linkage from device drivers, when packet is in an mbuf chain. - */ -void -bpf_mtap(struct ifnet *ifp, struct mbuf *m) +static uint32_t +get_pkt_trunc_len(u_char *p, u_int len) { - struct bpf_if *bp; - struct bpf_d *d; - u_int pktlen, slen; - struct mbuf *m0; + struct bpf_packet *pkt = (struct bpf_packet *)(void *) p; + struct pktap_header *pktap = (struct pktap_header *) (pkt->bpfp_header); + uint32_t out_pkt_len = 0, tlen = 0; + /* + * pktap->pth_frame_pre_length is L2 header length and accounts + * for both pre and pre_adjust. + * pktap->pth_length is sizeof(pktap_header) (excl the pre/pre_adjust) + * pkt->bpfp_header_length is (pktap->pth_length + pre_adjust) + * pre is the offset to the L3 header after the bpfp_header, or length + * of L2 header after bpfp_header, if present. + */ + int32_t pre = pktap->pth_frame_pre_length - + (pkt->bpfp_header_length - pktap->pth_length); + + /* Length of the input packet starting from L3 header */ + uint32_t in_pkt_len = len - pkt->bpfp_header_length - pre; + if (pktap->pth_protocol_family == AF_INET || + pktap->pth_protocol_family == AF_INET6) { + /* Contains L2 header */ + if (pre > 0) { + if (pre < (int32_t)sizeof(struct ether_header)) { + goto too_short; + } - lck_mtx_lock(bpf_mlock); - - bp = ifp->if_bpf; - if (bp) { - pktlen = 0; - for (m0 = m; m0 != 0; m0 = m0->m_next) - pktlen += m0->m_len; - - for (d = bp->bif_dlist; d != 0; d = d->bd_next) { - if (!d->bd_seesent && (m->m_pkthdr.rcvif == NULL)) - continue; - ++d->bd_rcount; - slen = bpf_filter(d->bd_filter, (u_char *)m, pktlen, 0); - if (slen != 0) - catchpacket(d, (u_char *)m, pktlen, slen, bpf_mcopy); + out_pkt_len = get_ether_trunc_len(pkt, 0, in_pkt_len); + } else if (pre == 0) { + if (pktap->pth_protocol_family == AF_INET) { + out_pkt_len = get_ip_trunc_len(pkt, pre, in_pkt_len); + } else if (pktap->pth_protocol_family == AF_INET6) { + out_pkt_len = get_ip6_trunc_len(pkt, pre, in_pkt_len); + } + } else { + /* Ideally pre should be >= 0. This is an exception */ + out_pkt_len = min(BPF_MIN_PKT_SIZE, in_pkt_len); + } + } else { + if (pktap->pth_iftype == IFT_ETHER) { + if (in_pkt_len < sizeof(struct ether_header)) { + goto too_short; + } + /* At most include the Ethernet header and 16 bytes */ + out_pkt_len = MIN(sizeof(struct ether_header) + 16, + in_pkt_len); + } else { + /* + * For unknown protocols include at most 16 bytes + */ + out_pkt_len = MIN(16, in_pkt_len); } } - - lck_mtx_unlock(bpf_mlock); +done: + tlen = pkt->bpfp_header_length + out_pkt_len + pre; + return tlen; +too_short: + out_pkt_len = in_pkt_len; + goto done; } /* * 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. "copy" is the routine called to do the actual data - * transfer. bcopy is passed in to copy contiguous chunks, while - * bpf_mcopy is passed in to copy mbuf chains. In the latter case, - * pkt is really an mbuf. + * otherwise 0. */ static void -catchpacket(struct bpf_d *d, u_char *pkt, u_int pktlen, u_int snaplen, - void (*cpfn)(const void *, void *, size_t)) +catchpacket(struct bpf_d *d, struct bpf_packet * pkt, + u_int snaplen, int outbound) { - register struct bpf_hdr *hp; - register int totlen, curlen; - register int hdrlen = d->bd_bif->bif_hdrlen; + struct bpf_hdr *hp; + struct bpf_hdr_ext *ehp; + int totlen, curlen; + int hdrlen, caplen; + int do_wakeup = 0; + u_char *payload; + struct timeval tv; + + hdrlen = (d->bd_flags & BPF_EXTENDED_HDR) ? d->bd_bif->bif_exthdrlen : + 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, pktlen); - if (totlen > d->bd_bufsize) + totlen = hdrlen + min(snaplen, 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. @@ -1412,44 +3298,117 @@ catchpacket(struct bpf_d *d, u_char *pkt, u_int pktlen, u_int snaplen, * 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_fbuf == 0) { - /* - * We haven't completed the previous read yet, - * so drop the packet. - */ + if (d->bd_hbuf_read != 0) { ++d->bd_dcount; return; } - ROTATE_BUFFERS(d); - bpf_wakeup(d); + + 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) + } else if (d->bd_immediate || d->bd_state == BPF_TIMED_OUT) { /* - * Immediate mode is set. A packet arrived so any - * reads should be woken up. + * 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. */ - bpf_wakeup(d); + do_wakeup = 1; + } /* * Append the bpf header. */ - hp = (struct bpf_hdr *)(d->bd_sbuf + curlen); -#if BSD >= 199103 - microtime(&hp->bh_tstamp); -#elif defined(sun) - uniqtime(&hp->bh_tstamp); -#else - hp->bh_tstamp = time; -#endif - hp->bh_datalen = pktlen; - hp->bh_hdrlen = hdrlen; + microtime(&tv); + if (d->bd_flags & BPF_EXTENDED_HDR) { + struct mbuf *m; + + m = (pkt->bpfp_type == BPF_PACKET_TYPE_MBUF) + ? pkt->bpfp_mbuf : NULL; + ehp = (struct bpf_hdr_ext *)(void *)(d->bd_sbuf + curlen); + memset(ehp, 0, sizeof(*ehp)); + ehp->bh_tstamp.tv_sec = tv.tv_sec; + ehp->bh_tstamp.tv_usec = tv.tv_usec; + + ehp->bh_datalen = pkt->bpfp_total_length; + ehp->bh_hdrlen = hdrlen; + caplen = ehp->bh_caplen = totlen - hdrlen; + if (m == NULL) { + if (outbound) { + ehp->bh_flags |= BPF_HDR_EXT_FLAGS_DIR_OUT; + } else { + ehp->bh_flags |= BPF_HDR_EXT_FLAGS_DIR_IN; + } + } else if (outbound) { + ehp->bh_flags |= BPF_HDR_EXT_FLAGS_DIR_OUT; + + /* 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; + ehp->bh_proto = m->m_pkthdr.pkt_proto; + } + 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; + } + } else { + ehp->bh_flags |= BPF_HDR_EXT_FLAGS_DIR_IN; + } + payload = (u_char *)ehp + hdrlen; + } else { + hp = (struct bpf_hdr *)(void *)(d->bd_sbuf + curlen); + hp->bh_tstamp.tv_sec = tv.tv_sec; + hp->bh_tstamp.tv_usec = tv.tv_usec; + hp->bh_datalen = pkt->bpfp_total_length; + hp->bh_hdrlen = hdrlen; + caplen = hp->bh_caplen = totlen - hdrlen; + payload = (u_char *)hp + hdrlen; + } /* * Copy the packet data into the store buffer and update its length. */ - (*cpfn)(pkt, (u_char *)hp + hdrlen, (hp->bh_caplen = totlen - hdrlen)); + copy_bpf_packet(pkt, payload, caplen); d->bd_slen = curlen + totlen; + d->bd_scnt += 1; + + if (do_wakeup) { + bpf_wakeup(d); + } } /* @@ -1458,18 +3417,35 @@ catchpacket(struct bpf_d *d, u_char *pkt, u_int pktlen, u_int snaplen, static int bpf_allocbufs(struct bpf_d *d) { + if (d->bd_sbuf != NULL) { + FREE(d->bd_sbuf, M_DEVBUF); + d->bd_sbuf = NULL; + } + if (d->bd_hbuf != NULL) { + FREE(d->bd_hbuf, M_DEVBUF); + d->bd_hbuf = NULL; + } + if (d->bd_fbuf != NULL) { + FREE(d->bd_fbuf, M_DEVBUF); + d->bd_fbuf = NULL; + } + d->bd_fbuf = (caddr_t) _MALLOC(d->bd_bufsize, M_DEVBUF, M_WAIT); - if (d->bd_fbuf == 0) - return (ENOBUFS); + if (d->bd_fbuf == NULL) { + return ENOBUFS; + } d->bd_sbuf = (caddr_t) _MALLOC(d->bd_bufsize, M_DEVBUF, M_WAIT); - if (d->bd_sbuf == 0) { + if (d->bd_sbuf == NULL) { FREE(d->bd_fbuf, M_DEVBUF); - return (ENOBUFS); + d->bd_fbuf = NULL; + return ENOBUFS; } d->bd_slen = 0; d->bd_hlen = 0; - return (0); + d->bd_scnt = 0; + d->bd_hcnt = 0; + return 0; } /* @@ -1484,40 +3460,116 @@ bpf_freed(struct bpf_d *d) * been detached from its interface and it yet hasn't been marked * free. */ + if (d->bd_hbuf_read != 0) { + panic("bpf buffer freed during read"); + } + if (d->bd_sbuf != 0) { FREE(d->bd_sbuf, M_DEVBUF); - if (d->bd_hbuf != 0) + if (d->bd_hbuf != 0) { FREE(d->bd_hbuf, M_DEVBUF); - if (d->bd_fbuf != 0) + } + if (d->bd_fbuf != 0) { FREE(d->bd_fbuf, M_DEVBUF); + } + } + if (d->bd_filter) { + FREE(d->bd_filter, M_DEVBUF); } - if (d->bd_filter) - FREE((caddr_t)d->bd_filter, M_DEVBUF); } /* - * Attach an interface to bpf. driverp is a pointer to a (struct bpf_if *) + * 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; - bp = (struct bpf_if *) _MALLOC(sizeof(*bp), M_DEVBUF, M_WAIT); - if (bp == 0) + 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; + + bp_new = (struct bpf_if *) _MALLOC(sizeof(*bp_new), M_DEVBUF, + M_WAIT | M_ZERO); + if (bp_new == 0) { panic("bpfattach"); + } lck_mtx_lock(bpf_mlock); - bp->bif_dlist = 0; - bp->bif_ifp = ifp; - bp->bif_dlt = dlt; + /* + * 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); + printf("bpfattach - %s with dlt %d is already attached\n", + if_name(ifp), dlt); + FREE(bp_new, M_DEVBUF); + return EEXIST; + } - bp->bif_next = bpf_iflist; - bpf_iflist = bp; + bp_new->bif_ifp = ifp; + bp_new->bif_dlt = dlt; + bp_new->bif_send = send; + bp_new->bif_tap = tap; - bp->bif_ifp->if_bpf = 0; + 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 @@ -1525,17 +3577,22 @@ bpfattach(struct ifnet *ifp, u_int dlt, u_int hdrlen) * that the network layer header begins on a longword boundary (for * performance reasons and to alleviate alignment restrictions). */ - bp->bif_hdrlen = BPF_WORDALIGN(hdrlen + SIZEOF_BPF_HDR) - hdrlen; - + bp_new->bif_hdrlen = BPF_WORDALIGN(hdrlen + SIZEOF_BPF_HDR) - hdrlen; + bp_new->bif_exthdrlen = BPF_WORDALIGN(hdrlen + + sizeof(struct bpf_hdr_ext)) - hdrlen; + /* Take a reference on the interface */ - ifp_reference(ifp); + ifnet_reference(ifp); lck_mtx_unlock(bpf_mlock); #ifndef __APPLE__ - if (bootverbose) - printf("bpf: %s%d attached\n", ifp->if_name, ifp->if_unit); + if (bootverbose) { + printf("bpf: %s attached\n", if_name(ifp)); + } #endif + + return 0; } /* @@ -1547,107 +3604,90 @@ bpfattach(struct ifnet *ifp, u_int dlt, u_int hdrlen) void bpfdetach(struct ifnet *ifp) { - struct bpf_if *bp, *bp_prev; - struct bpf_d *d; - int s; + struct bpf_if *bp, *bp_prev, *bp_next; + struct bpf_d *d; + + if (bpf_debug != 0) { + printf("%s: %s\n", __func__, if_name(ifp)); + } - s = splimp(); - lck_mtx_lock(bpf_mlock); - /* Locate BPF interface information */ + /* + * 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->bif_next) { - if (ifp == bp->bif_ifp) - break; - bp_prev = bp; - } - -#ifdef __APPLE__ - /* Check for no BPF interface information */ - if (bp == NULL) { - return; - } -#endif + for (bp = bpf_iflist; bp != NULL; bp = bp_next) { + bp_next = bp->bif_next; - /* Interface wasn't attached */ - if (bp->bif_ifp == NULL) { - splx(s); -#ifndef __APPLE__ - printf("bpfdetach: %s%d was not attached\n", ifp->if_name, - ifp->if_unit); -#endif - return; - } + 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; + } - while ((d = bp->bif_dlist) != NULL) { - bpf_detachd(d); - bpf_wakeup(d); + /* 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); + bpf_detachd(d, 0); + bpf_wakeup(d); + bpf_release_d(d); + } + ifnet_release(ifp); } - if (bp_prev) { - bp_prev->bif_next = bp->bif_next; - } else { - bpf_iflist = bp->bif_next; - } - - ifp_release(ifp); - lck_mtx_unlock(bpf_mlock); - - FREE(bp, M_DEVBUF); - - splx(s); } void bpf_init(__unused void *unused) { #ifdef __APPLE__ - int i; - int maj; + int i; + int maj; if (bpf_devsw_installed == 0) { bpf_devsw_installed = 1; - - bpf_mlock_grp_attr = lck_grp_attr_alloc_init(); - lck_grp_attr_setdefault(bpf_mlock_grp_attr); - - bpf_mlock_grp = lck_grp_alloc_init("bpf", bpf_mlock_grp_attr); - - bpf_mlock_attr = lck_attr_alloc_init(); - lck_attr_setdefault(bpf_mlock_attr); - - bpf_mlock = lck_mtx_alloc_init(bpf_mlock_grp, bpf_mlock_attr); - - if (bpf_mlock == 0) { - printf("bpf_init: failed to allocate bpf_mlock\n"); - bpf_devsw_installed = 0; - return; - } - + bpf_mlock_grp_attr = lck_grp_attr_alloc_init(); + bpf_mlock_grp = lck_grp_alloc_init("bpf", bpf_mlock_grp_attr); + bpf_mlock_attr = lck_attr_alloc_init(); + lck_mtx_init(bpf_mlock, bpf_mlock_grp, bpf_mlock_attr); maj = cdevsw_add(CDEV_MAJOR, &bpf_cdevsw); if (maj == -1) { - if (bpf_mlock) - lck_mtx_free(bpf_mlock, bpf_mlock_grp); - if (bpf_mlock_attr) + if (bpf_mlock_attr) { lck_attr_free(bpf_mlock_attr); - if (bpf_mlock_grp) + } + if (bpf_mlock_grp) { lck_grp_free(bpf_mlock_grp); - if (bpf_mlock_grp_attr) + } + if (bpf_mlock_grp_attr) { lck_grp_attr_free(bpf_mlock_grp_attr); - - bpf_mlock = 0; - bpf_mlock_attr = 0; - bpf_mlock_grp = 0; - bpf_mlock_grp_attr = 0; + } + + bpf_mlock = NULL; + bpf_mlock_attr = NULL; + bpf_mlock_grp = NULL; + bpf_mlock_grp_attr = NULL; bpf_devsw_installed = 0; - printf("bpf_init: failed to allocate a major number!\n"); + printf("bpf_init: failed to allocate a major number\n"); return; } - for (i = 0 ; i < NBPFILTER; i++) + for (i = 0; i < NBPFILTER; i++) { bpf_make_dev_t(maj); + } } #else cdevsw_add(&bpf_cdevsw); @@ -1655,54 +3695,26 @@ bpf_init(__unused void *unused) } #ifndef __APPLE__ -SYSINIT(bpfdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,bpf_drvinit,NULL) +SYSINIT(bpfdev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE + CDEV_MAJOR, bpf_drvinit, NULL); #endif -#else /* !BPF */ -#ifndef __APPLE__ -/* - * NOP stubs to allow bpf-using drivers to load and function. - * - * A 'better' implementation would allow the core bpf functionality - * to be loaded at runtime. - */ - -void -bpf_tap(ifp, pkt, pktlen) - struct ifnet *ifp; - register u_char *pkt; - register u_int pktlen; +static int +sysctl_bpf_maxbufsize SYSCTL_HANDLER_ARGS { -} +#pragma unused(arg1, arg2) + int i, err; -void -bpf_mtap(ifp, m) - struct ifnet *ifp; - struct mbuf *m; -{ -} + i = bpf_maxbufsize; -void -bpfattach(ifp, dlt, hdrlen) - struct ifnet *ifp; - u_int dlt, hdrlen; -{ -} + err = sysctl_handle_int(oidp, &i, 0, req); + if (err != 0 || req->newptr == USER_ADDR_NULL) { + return err; + } -void -bpfdetach(ifp) - struct ifnet *ifp; -{ -} + if (i < 0 || i > BPF_MAXSIZE_CAP) { + i = BPF_MAXSIZE_CAP; + } -u_int -bpf_filter(pc, p, wirelen, buflen) - register const struct bpf_insn *pc; - register u_char *p; - u_int wirelen; - register u_int buflen; -{ - return -1; /* "no filter" behaviour */ + bpf_maxbufsize = i; + return err; } -#endif /* !defined(__APPLE__) */ -#endif /* NBPFILTER > 0 */