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gems-kernel/source/THIRDPARTY/xnu/bsd/net/pktap.c

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add darwin/xnu functionality
2024-06-03 11:29:39 -05:00
/*
* Copyright (c) 2012-2021 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
#include <kern/locks.h>
#include <kern/zalloc.h>
#include <sys/types.h>
#include <sys/kernel_types.h>
#include <sys/kauth.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <sys/proc.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_types.h>
#include <net/bpf.h>
#include <net/net_osdep.h>
#include <net/pktap.h>
#include <netinet/in_pcb.h>
#include <netinet/tcp.h>
#include <netinet/tcp_var.h>
#define _IP_VHL
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet/ip6.h>
#include <netinet6/in6_pcb.h>
#include <libkern/OSAtomic.h>
#include <kern/debug.h>
#include <sys/mcache.h>
#include <string.h>
extern struct inpcbinfo ripcbinfo;
struct pktap_softc {
LIST_ENTRY(pktap_softc) pktp_link;
uint32_t pktp_unit;
uint32_t pktp_dlt_raw_count;
uint32_t pktp_dlt_pkttap_count;
struct ifnet *pktp_ifp;
struct pktap_filter pktp_filters[PKTAP_MAX_FILTERS];
};
#ifndef PKTAP_DEBUG
#define PKTAP_DEBUG 0
#endif /* PKTAP_DEBUG */
#define PKTAP_FILTER_OK 0 /* Packet passes filter checks */
#define PKTAP_FILTER_SKIP 1 /* Do not tap this packet */
static int pktap_inited = 0;
SYSCTL_DECL(_net_link);
SYSCTL_NODE(_net_link, IFT_PKTAP, pktap,
CTLFLAG_RW | CTLFLAG_LOCKED, 0, "pktap virtual interface");
uint32_t pktap_total_tap_count = 0;
SYSCTL_UINT(_net_link_pktap, OID_AUTO, total_tap_count,
CTLFLAG_RD | CTLFLAG_LOCKED, &pktap_total_tap_count, 0, "");
static u_int64_t pktap_count_unknown_if_type = 0;
SYSCTL_QUAD(_net_link_pktap, OID_AUTO, count_unknown_if_type,
CTLFLAG_RD | CTLFLAG_LOCKED, &pktap_count_unknown_if_type, "");
static int pktap_log = 0;
SYSCTL_INT(_net_link_pktap, OID_AUTO, log,
CTLFLAG_RW | CTLFLAG_LOCKED, &pktap_log, 0, "");
#define PKTAP_LOG(mask, fmt, ...) \
do { \
if ((pktap_log & mask)) \
printf("%s:%d " fmt, __FUNCTION__, __LINE__, ##__VA_ARGS__); \
} while (false)
#define PKTP_LOG_FUNC 0x01
#define PKTP_LOG_FILTER 0x02
#define PKTP_LOG_INPUT 0x04
#define PKTP_LOG_OUTPUT 0x08
#define PKTP_LOG_ERROR 0x10
#define PKTP_LOG_NOPCB 0x20
/*
* pktap_lck_rw protects the global list of pktap interfaces
*/
static LCK_GRP_DECLARE(pktap_lck_grp, "pktap");
#if PKTAP_DEBUG
static LCK_ATTR_DECLARE(pktap_lck_attr, LCK_ATTR_DEBUG, 0);
#else
static LCK_ATTR_DECLARE(pktap_lck_attr, 0, 0);
#endif
static LCK_RW_DECLARE_ATTR(pktap_lck_rw, &pktap_lck_grp, &pktap_lck_attr);
static LIST_HEAD(pktap_list, pktap_softc) pktap_list =
LIST_HEAD_INITIALIZER(pktap_list);
int pktap_clone_create(struct if_clone *, u_int32_t, void *);
int pktap_clone_destroy(struct ifnet *);
#define PKTAP_MAXUNIT IF_MAXUNIT
#define PKTAP_ZONE_MAX_ELEM MIN(IFNETS_MAX, PKTAP_MAXUNIT)
static struct if_clone pktap_cloner =
IF_CLONE_INITIALIZER(PKTAP_IFNAME,
pktap_clone_create,
pktap_clone_destroy,
0,
PKTAP_MAXUNIT);
errno_t pktap_if_output(ifnet_t, mbuf_t);
errno_t pktap_demux(ifnet_t, mbuf_t, char *, protocol_family_t *);
errno_t pktap_add_proto(ifnet_t, protocol_family_t,
const struct ifnet_demux_desc *, u_int32_t);
errno_t pktap_del_proto(ifnet_t, protocol_family_t);
errno_t pktap_getdrvspec(ifnet_t, struct ifdrv64 *);
errno_t pktap_setdrvspec(ifnet_t, struct ifdrv64 *);
errno_t pktap_ioctl(ifnet_t, unsigned long, void *);
void pktap_detach(ifnet_t);
int pktap_filter_evaluate(struct pktap_softc *, struct ifnet *);
void pktap_bpf_tap(struct ifnet *, protocol_family_t, struct mbuf *,
u_int32_t, u_int32_t, int);
errno_t pktap_tap_callback(ifnet_t, u_int32_t, bpf_tap_mode);
static void
pktap_hexdump(int mask, void *addr, size_t len)
{
unsigned char *buf = addr;
size_t i;
if (!(pktap_log & mask)) {
return;
}
for (i = 0; i < len; i++) {
unsigned char h = (buf[i] & 0xf0) >> 4;
unsigned char l = buf[i] & 0x0f;
if (i != 0) {
if (i % 32 == 0) {
printf("\n");
} else if (i % 4 == 0) {
printf(" ");
}
}
printf("%c%c",
h < 10 ? h + '0' : h - 10 + 'a',
l < 10 ? l + '0' : l - 10 + 'a');
}
if (i % 32 != 0) {
printf("\n");
}
}
#define _CASSERT_OFFFSETOF_FIELD(s1, s2, f) \
_CASSERT(offsetof(struct s1, f) == offsetof(struct s2, f))
__private_extern__ void
pktap_init(void)
{
int error = 0;
_CASSERT_OFFFSETOF_FIELD(pktap_header, pktap_v2_hdr, pth_flags);
/* Make sure we're called only once */
VERIFY(pktap_inited == 0);
pktap_inited = 1;
LIST_INIT(&pktap_list);
error = if_clone_attach(&pktap_cloner);
if (error != 0) {
panic("%s: if_clone_attach() failed, error %d",
__func__, error);
}
}
__private_extern__ int
pktap_clone_create(struct if_clone *ifc, u_int32_t unit, __unused void *params)
{
int error = 0;
struct pktap_softc *pktap = NULL;
struct ifnet_init_eparams if_init;
PKTAP_LOG(PKTP_LOG_FUNC, "unit %u\n", unit);
pktap = kalloc_type(struct pktap_softc, Z_WAITOK_ZERO_NOFAIL);
pktap->pktp_unit = unit;
/*
* By default accept packet from physical interfaces
*/
pktap->pktp_filters[0].filter_op = PKTAP_FILTER_OP_PASS;
pktap->pktp_filters[0].filter_param = PKTAP_FILTER_PARAM_IF_TYPE;
pktap->pktp_filters[0].filter_param_if_type = IFT_ETHER;
#if !XNU_TARGET_OS_OSX
pktap->pktp_filters[1].filter_op = PKTAP_FILTER_OP_PASS;
pktap->pktp_filters[1].filter_param = PKTAP_FILTER_PARAM_IF_TYPE;
pktap->pktp_filters[1].filter_param_if_type = IFT_CELLULAR;
#else /* XNU_TARGET_OS_OSX */
pktap->pktp_filters[1].filter_op = PKTAP_FILTER_OP_PASS;
pktap->pktp_filters[1].filter_param = PKTAP_FILTER_PARAM_IF_TYPE;
pktap->pktp_filters[1].filter_param_if_type = IFT_IEEE1394;
#endif /* XNU_TARGET_OS_OSX */
pktap->pktp_filters[2].filter_op = PKTAP_FILTER_OP_PASS;
pktap->pktp_filters[2].filter_param = PKTAP_FILTER_PARAM_IF_TYPE;
pktap->pktp_filters[2].filter_param_if_type = IFT_OTHER;
/*
* We do not use a set_bpf_tap() function as we rather rely on the more
* accurate callback passed to bpf_attach()
*/
bzero(&if_init, sizeof(if_init));
if_init.ver = IFNET_INIT_CURRENT_VERSION;
if_init.len = sizeof(if_init);
if_init.flags = IFNET_INIT_LEGACY;
if_init.name = ifc->ifc_name;
if_init.unit = unit;
if_init.type = IFT_PKTAP;
if_init.family = IFNET_FAMILY_LOOPBACK;
if_init.output = pktap_if_output;
if_init.demux = pktap_demux;
if_init.add_proto = pktap_add_proto;
if_init.del_proto = pktap_del_proto;
if_init.softc = pktap;
if_init.ioctl = pktap_ioctl;
if_init.detach = pktap_detach;
error = ifnet_allocate_extended(&if_init, &pktap->pktp_ifp);
if (error != 0) {
printf("%s: ifnet_allocate failed, error %d\n",
__func__, error);
goto done;
}
ifnet_set_flags(pktap->pktp_ifp, IFF_UP, IFF_UP);
error = ifnet_attach(pktap->pktp_ifp, NULL);
if (error != 0) {
printf("%s: ifnet_attach failed - error %d\n", __func__, error);
ifnet_release(pktap->pktp_ifp);
goto done;
}
/* Attach DLT_PKTAP as the default DLT */
bpf_attach(pktap->pktp_ifp, DLT_PKTAP, sizeof(struct pktap_header),
NULL, pktap_tap_callback);
bpf_attach(pktap->pktp_ifp, DLT_RAW, 0, NULL, pktap_tap_callback);
/* Take a reference and add to the global list */
ifnet_reference(pktap->pktp_ifp);
lck_rw_lock_exclusive(&pktap_lck_rw);
LIST_INSERT_HEAD(&pktap_list, pktap, pktp_link);
lck_rw_done(&pktap_lck_rw);
done:
if (error != 0 && pktap != NULL) {
kfree_type(struct pktap_softc, pktap);
}
return error;
}
__private_extern__ int
pktap_clone_destroy(struct ifnet *ifp)
{
int error = 0;
PKTAP_LOG(PKTP_LOG_FUNC, "%s\n", ifp->if_xname);
(void) ifnet_detach(ifp);
return error;
}
/*
* This function is called whenever a DLT is set on the interface:
* - When interface is attached to a BPF device via BIOCSETIF for the
* default DLT
* - Whenever a new DLT is selected via BIOCSDLT
* - When the interface is detached from a BPF device (direction is zero)
*/
__private_extern__ errno_t
pktap_tap_callback(ifnet_t ifp, u_int32_t dlt, bpf_tap_mode direction)
{
struct pktap_softc *pktap;
pktap = ifp->if_softc;
if (pktap == NULL) {
printf("%s: if_softc is NULL for ifp %s\n", __func__,
ifp->if_xname);
goto done;
}
switch (dlt) {
case DLT_RAW:
if (direction == 0) {
if (pktap->pktp_dlt_raw_count > 0) {
pktap->pktp_dlt_raw_count--;
OSAddAtomic(-1, &pktap_total_tap_count);
}
} else {
pktap->pktp_dlt_raw_count++;
OSAddAtomic(1, &pktap_total_tap_count);
}
break;
case DLT_PKTAP:
if (direction == 0) {
if (pktap->pktp_dlt_pkttap_count > 0) {
pktap->pktp_dlt_pkttap_count--;
OSAddAtomic(-1, &pktap_total_tap_count);
}
} else {
pktap->pktp_dlt_pkttap_count++;
OSAddAtomic(1, &pktap_total_tap_count);
}
break;
}
done:
/*
* Attachements count must be positive and we're in trouble
* if we have more that 2**31 attachements
*/
VERIFY(pktap_total_tap_count >= 0);
return 0;
}
__private_extern__ errno_t
pktap_if_output(ifnet_t ifp, mbuf_t m)
{
PKTAP_LOG(PKTP_LOG_FUNC, "%s\n", ifp->if_xname);
mbuf_freem(m);
return ENOTSUP;
}
__private_extern__ errno_t
pktap_demux(ifnet_t ifp, __unused mbuf_t m, __unused char *header,
__unused protocol_family_t *ppf)
{
PKTAP_LOG(PKTP_LOG_FUNC, "%s\n", ifp->if_xname);
return ENOTSUP;
}
__private_extern__ errno_t
pktap_add_proto(__unused ifnet_t ifp, protocol_family_t pf,
__unused const struct ifnet_demux_desc *dmx, __unused u_int32_t cnt)
{
PKTAP_LOG(PKTP_LOG_FUNC, "%s pf %u\n", ifp->if_xname, pf);
return 0;
}
__private_extern__ errno_t
pktap_del_proto(__unused ifnet_t ifp, __unused protocol_family_t pf)
{
PKTAP_LOG(PKTP_LOG_FUNC, "%s pf %u\n", ifp->if_xname, pf);
return 0;
}
__private_extern__ errno_t
pktap_getdrvspec(ifnet_t ifp, struct ifdrv64 *ifd)
{
errno_t error = 0;
struct pktap_softc *pktap;
int i;
PKTAP_LOG(PKTP_LOG_FUNC, "%s\n", ifp->if_xname);
pktap = ifp->if_softc;
if (pktap == NULL) {
error = ENOENT;
printf("%s: pktap NULL - error %d\n", __func__, error);
goto done;
}
switch (ifd->ifd_cmd) {
case PKTP_CMD_FILTER_GET: {
struct x_pktap_filter x_filters[PKTAP_MAX_FILTERS];
bzero(&x_filters, sizeof(x_filters));
if (ifd->ifd_len < PKTAP_MAX_FILTERS * sizeof(struct x_pktap_filter)) {
printf("%s: PKTP_CMD_FILTER_GET ifd_len %llu too small - error %d\n",
__func__, ifd->ifd_len, error);
error = EINVAL;
break;
}
for (i = 0; i < PKTAP_MAX_FILTERS; i++) {
struct pktap_filter *pktap_filter = pktap->pktp_filters + i;
struct x_pktap_filter *x_filter = x_filters + i;
x_filter->filter_op = pktap_filter->filter_op;
x_filter->filter_param = pktap_filter->filter_param;
if (pktap_filter->filter_param == PKTAP_FILTER_PARAM_IF_TYPE) {
x_filter->filter_param_if_type = pktap_filter->filter_param_if_type;
} else if (pktap_filter->filter_param == PKTAP_FILTER_PARAM_IF_NAME) {
strlcpy(x_filter->filter_param_if_name,
pktap_filter->filter_param_if_name,
sizeof(x_filter->filter_param_if_name));
}
}
error = copyout(x_filters, CAST_USER_ADDR_T(ifd->ifd_data),
PKTAP_MAX_FILTERS * sizeof(struct x_pktap_filter));
if (error) {
printf("%s: PKTP_CMD_FILTER_GET copyout - error %d\n", __func__, error);
goto done;
}
break;
}
case PKTP_CMD_TAP_COUNT: {
uint32_t tap_count = pktap->pktp_dlt_raw_count + pktap->pktp_dlt_pkttap_count;
if (ifd->ifd_len < sizeof(tap_count)) {
printf("%s: PKTP_CMD_TAP_COUNT ifd_len %llu too small - error %d\n",
__func__, ifd->ifd_len, error);
error = EINVAL;
break;
}
error = copyout(&tap_count, CAST_USER_ADDR_T(ifd->ifd_data), sizeof(tap_count));
if (error) {
printf("%s: PKTP_CMD_TAP_COUNT copyout - error %d\n", __func__, error);
goto done;
}
break;
}
default:
error = EINVAL;
break;
}
done:
return error;
}
__private_extern__ errno_t
pktap_setdrvspec(ifnet_t ifp, struct ifdrv64 *ifd)
{
errno_t error = 0;
struct pktap_softc *pktap;
PKTAP_LOG(PKTP_LOG_FUNC, "%s\n", ifp->if_xname);
pktap = ifp->if_softc;
if (pktap == NULL) {
error = ENOENT;
printf("%s: pktap NULL - error %d\n", __func__, error);
goto done;
}
switch (ifd->ifd_cmd) {
case PKTP_CMD_FILTER_SET: {
struct x_pktap_filter user_filters[PKTAP_MAX_FILTERS];
int i;
int got_op_none = 0;
if (ifd->ifd_len != PKTAP_MAX_FILTERS * sizeof(struct x_pktap_filter)) {
printf("%s: PKTP_CMD_FILTER_SET bad ifd_len %llu - error %d\n",
__func__, ifd->ifd_len, error);
error = EINVAL;
break;
}
error = copyin(CAST_USER_ADDR_T(ifd->ifd_data), &user_filters, (size_t)ifd->ifd_len);
if (error) {
printf("%s: copyin - error %d\n", __func__, error);
goto done;
}
/*
* Validate user provided parameters
*/
for (i = 0; i < PKTAP_MAX_FILTERS; i++) {
struct x_pktap_filter *x_filter = user_filters + i;
switch (x_filter->filter_op) {
case PKTAP_FILTER_OP_NONE:
/* Following entries must be PKTAP_FILTER_OP_NONE */
got_op_none = 1;
break;
case PKTAP_FILTER_OP_PASS:
case PKTAP_FILTER_OP_SKIP:
/* Invalid after PKTAP_FILTER_OP_NONE */
if (got_op_none) {
error = EINVAL;
break;
}
break;
default:
error = EINVAL;
break;
}
if (error != 0) {
break;
}
switch (x_filter->filter_param) {
case PKTAP_FILTER_OP_NONE:
if (x_filter->filter_op != PKTAP_FILTER_OP_NONE) {
error = EINVAL;
break;
}
break;
/*
* Do not allow to tap a pktap from a pktap
*/
case PKTAP_FILTER_PARAM_IF_TYPE:
if (x_filter->filter_param_if_type == IFT_PKTAP ||
x_filter->filter_param_if_type > 0xff) {
error = EINVAL;
break;
}
break;
case PKTAP_FILTER_PARAM_IF_NAME:
if (strncmp(x_filter->filter_param_if_name, PKTAP_IFNAME,
strlen(PKTAP_IFNAME)) == 0) {
error = EINVAL;
break;
}
break;
default:
error = EINVAL;
break;
}
if (error != 0) {
break;
}
}
if (error != 0) {
break;
}
for (i = 0; i < PKTAP_MAX_FILTERS; i++) {
struct pktap_filter *pktap_filter = pktap->pktp_filters + i;
struct x_pktap_filter *x_filter = user_filters + i;
pktap_filter->filter_op = x_filter->filter_op;
pktap_filter->filter_param = x_filter->filter_param;
if (pktap_filter->filter_param == PKTAP_FILTER_PARAM_IF_TYPE) {
pktap_filter->filter_param_if_type = x_filter->filter_param_if_type;
} else if (pktap_filter->filter_param == PKTAP_FILTER_PARAM_IF_NAME) {
size_t len;
strlcpy(pktap_filter->filter_param_if_name,
x_filter->filter_param_if_name,
sizeof(pktap_filter->filter_param_if_name));
/*
* If name does not end with a number then it's a "wildcard" match
* where we compare the prefix of the interface name
*/
len = strlen(pktap_filter->filter_param_if_name);
if (pktap_filter->filter_param_if_name[len] < '0' ||
pktap_filter->filter_param_if_name[len] > '9') {
pktap_filter->filter_ifname_prefix_len = len;
}
}
}
break;
}
default:
error = EINVAL;
break;
}
done:
return error;
}
__private_extern__ errno_t
pktap_ioctl(ifnet_t ifp, unsigned long cmd, void *data)
{
errno_t error = 0;
PKTAP_LOG(PKTP_LOG_FUNC, "%s\n", ifp->if_xname);
if ((cmd & IOC_IN)) {
error = kauth_authorize_generic(kauth_cred_get(), KAUTH_GENERIC_ISSUSER);
if (error) {
PKTAP_LOG(PKTP_LOG_ERROR,
"%s: kauth_authorize_generic(KAUTH_GENERIC_ISSUSER) - error %d\n",
__func__, error);
goto done;
}
}
switch (cmd) {
case SIOCGDRVSPEC32: {
struct ifdrv64 ifd;
struct ifdrv32 *ifd32 = (struct ifdrv32 *)data;
memcpy(ifd.ifd_name, ifd32->ifd_name, sizeof(ifd.ifd_name));
ifd.ifd_cmd = ifd32->ifd_cmd;
ifd.ifd_len = ifd32->ifd_len;
ifd.ifd_data = ifd32->ifd_data;
error = pktap_getdrvspec(ifp, &ifd);
break;
}
case SIOCGDRVSPEC64: {
struct ifdrv64 *ifd64 = (struct ifdrv64 *)data;
error = pktap_getdrvspec(ifp, ifd64);
break;
}
case SIOCSDRVSPEC32: {
struct ifdrv64 ifd;
struct ifdrv32 *ifd32 = (struct ifdrv32 *)data;
memcpy(ifd.ifd_name, ifd32->ifd_name, sizeof(ifd.ifd_name));
ifd.ifd_cmd = ifd32->ifd_cmd;
ifd.ifd_len = ifd32->ifd_len;
ifd.ifd_data = ifd32->ifd_data;
error = pktap_setdrvspec(ifp, &ifd);
break;
}
case SIOCSDRVSPEC64: {
struct ifdrv64 *ifd64 = (struct ifdrv64 *)data;
error = pktap_setdrvspec(ifp, ifd64);
break;
}
default:
error = ENOTSUP;
break;
}
done:
return error;
}
__private_extern__ void
pktap_detach(ifnet_t ifp)
{
struct pktap_softc *pktap;
PKTAP_LOG(PKTP_LOG_FUNC, "%s\n", ifp->if_xname);
lck_rw_lock_exclusive(&pktap_lck_rw);
pktap = ifp->if_softc;
ifp->if_softc = NULL;
LIST_REMOVE(pktap, pktp_link);
lck_rw_done(&pktap_lck_rw);
/* Drop reference as it's no more on the global list */
ifnet_release(ifp);
kfree_type(struct pktap_softc, pktap);
/* This is for the reference taken by ifnet_attach() */
(void) ifnet_release(ifp);
}
__private_extern__ int
pktap_filter_evaluate(struct pktap_softc *pktap, struct ifnet *ifp)
{
int i;
int result = PKTAP_FILTER_SKIP; /* Need positive matching rule to pass */
int match = 0;
for (i = 0; i < PKTAP_MAX_FILTERS; i++) {
struct pktap_filter *pktap_filter = pktap->pktp_filters + i;
size_t len = pktap_filter->filter_ifname_prefix_len != 0 ?
pktap_filter->filter_ifname_prefix_len : PKTAP_IFXNAMESIZE;
switch (pktap_filter->filter_op) {
case PKTAP_FILTER_OP_NONE:
match = 1;
break;
case PKTAP_FILTER_OP_PASS:
if (pktap_filter->filter_param == PKTAP_FILTER_PARAM_IF_TYPE) {
if (pktap_filter->filter_param_if_type == 0 ||
ifp->if_type == pktap_filter->filter_param_if_type) {
result = PKTAP_FILTER_OK;
match = 1;
PKTAP_LOG(PKTP_LOG_FILTER, "pass %s match type %u\n",
ifp->if_xname, pktap_filter->filter_param_if_type);
break;
}
}
if (pktap_filter->filter_param == PKTAP_FILTER_PARAM_IF_NAME) {
if (strncmp(ifp->if_xname, pktap_filter->filter_param_if_name,
len) == 0) {
result = PKTAP_FILTER_OK;
match = 1;
PKTAP_LOG(PKTP_LOG_FILTER, "pass %s match name %s\n",
ifp->if_xname, pktap_filter->filter_param_if_name);
break;
}
}
break;
case PKTAP_FILTER_OP_SKIP:
if (pktap_filter->filter_param == PKTAP_FILTER_PARAM_IF_TYPE) {
if (pktap_filter->filter_param_if_type == 0 ||
ifp->if_type == pktap_filter->filter_param_if_type) {
result = PKTAP_FILTER_SKIP;
match = 1;
PKTAP_LOG(PKTP_LOG_FILTER, "skip %s match type %u\n",
ifp->if_xname, pktap_filter->filter_param_if_type);
break;
}
}
if (pktap_filter->filter_param == PKTAP_FILTER_PARAM_IF_NAME) {
if (strncmp(ifp->if_xname, pktap_filter->filter_param_if_name,
len) == 0) {
result = PKTAP_FILTER_SKIP;
match = 1;
PKTAP_LOG(PKTP_LOG_FILTER, "skip %s match name %s\n",
ifp->if_xname, pktap_filter->filter_param_if_name);
break;
}
}
break;
}
if (match) {
break;
}
}
if (match == 0) {
PKTAP_LOG(PKTP_LOG_FILTER, "%s no match\n",
ifp->if_xname);
}
return result;
}
static void
pktap_set_procinfo(struct pktap_header *hdr, struct so_procinfo *soprocinfo)
{
hdr->pth_pid = soprocinfo->spi_pid;
if (hdr->pth_comm[0] == 0) {
proc_name(soprocinfo->spi_pid, hdr->pth_comm, MAXCOMLEN);
}
strlcpy(&hdr->pth_comm[0], &soprocinfo->spi_proc_name[0], sizeof(hdr->pth_comm));
if (soprocinfo->spi_pid != 0) {
uuid_copy(hdr->pth_uuid, soprocinfo->spi_uuid);
}
if (soprocinfo->spi_delegated != 0) {
hdr->pth_flags |= PTH_FLAG_PROC_DELEGATED;
hdr->pth_epid = soprocinfo->spi_epid;
strlcpy(&hdr->pth_ecomm[0], &soprocinfo->spi_e_proc_name[0], sizeof(hdr->pth_ecomm));
uuid_copy(hdr->pth_euuid, soprocinfo->spi_euuid);
}
}
__private_extern__ void
pktap_finalize_proc_info(struct pktap_header *hdr)
{
int found;
struct so_procinfo soprocinfo;
if (!(hdr->pth_flags & PTH_FLAG_DELAY_PKTAP)) {
return;
}
if (hdr->pth_ipproto == IPPROTO_TCP) {
found = inp_findinpcb_procinfo(&tcbinfo, hdr->pth_flowid,
&soprocinfo);
} else if (hdr->pth_ipproto == IPPROTO_UDP) {
found = inp_findinpcb_procinfo(&udbinfo, hdr->pth_flowid,
&soprocinfo);
} else {
found = inp_findinpcb_procinfo(&ripcbinfo, hdr->pth_flowid,
&soprocinfo);
}
if (found == 1) {
pktap_set_procinfo(hdr, &soprocinfo);
}
}
static void
pktap_v2_set_procinfo(struct pktap_v2_hdr *pktap_v2_hdr,
struct so_procinfo *soprocinfo)
{
pktap_v2_hdr->pth_pid = soprocinfo->spi_pid;
if (soprocinfo->spi_pid != 0 && soprocinfo->spi_pid != -1) {
if (pktap_v2_hdr->pth_comm_offset != 0) {
char *ptr = ((char *)pktap_v2_hdr) +
pktap_v2_hdr->pth_comm_offset;
strlcpy(ptr, &soprocinfo->spi_proc_name[0], PKTAP_MAX_COMM_SIZE);
}
if (pktap_v2_hdr->pth_uuid_offset != 0) {
uuid_t *ptr = (uuid_t *) (((char *)pktap_v2_hdr) +
pktap_v2_hdr->pth_uuid_offset);
uuid_copy(*ptr, soprocinfo->spi_uuid);
}
}
if (!(pktap_v2_hdr->pth_flags & PTH_FLAG_PROC_DELEGATED)) {
return;
}
/*
* The effective UUID may be set independently from the effective pid
*/
if (soprocinfo->spi_delegated != 0) {
pktap_v2_hdr->pth_flags |= PTH_FLAG_PROC_DELEGATED;
pktap_v2_hdr->pth_e_pid = soprocinfo->spi_epid;
if (soprocinfo->spi_pid != 0 && soprocinfo->spi_pid != -1 &&
pktap_v2_hdr->pth_e_comm_offset != 0) {
char *ptr = ((char *)pktap_v2_hdr) +
pktap_v2_hdr->pth_e_comm_offset;
strlcpy(ptr, &soprocinfo->spi_e_proc_name[0], PKTAP_MAX_COMM_SIZE);
}
if (pktap_v2_hdr->pth_e_uuid_offset != 0) {
uuid_t *ptr = (uuid_t *) (((char *)pktap_v2_hdr) +
pktap_v2_hdr->pth_e_uuid_offset);
uuid_copy(*ptr, soprocinfo->spi_euuid);
}
}
}
__private_extern__ void
pktap_v2_finalize_proc_info(struct pktap_v2_hdr *pktap_v2_hdr)
{
int found;
struct so_procinfo soprocinfo;
if (!(pktap_v2_hdr->pth_flags & PTH_FLAG_DELAY_PKTAP)) {
return;
}
if (pktap_v2_hdr->pth_ipproto == IPPROTO_TCP) {
found = inp_findinpcb_procinfo(&tcbinfo,
pktap_v2_hdr->pth_flowid, &soprocinfo);
} else if (pktap_v2_hdr->pth_ipproto == IPPROTO_UDP) {
found = inp_findinpcb_procinfo(&udbinfo,
pktap_v2_hdr->pth_flowid, &soprocinfo);
} else {
found = inp_findinpcb_procinfo(&ripcbinfo,
pktap_v2_hdr->pth_flowid, &soprocinfo);
}
if (found == 1) {
pktap_v2_set_procinfo(pktap_v2_hdr, &soprocinfo);
}
}
__private_extern__ void
pktap_fill_proc_info(struct pktap_header *hdr, protocol_family_t proto,
struct mbuf *m, u_int32_t pre, int outgoing, struct ifnet *ifp)
{
/*
* Getting the pid and procname is expensive
* For outgoing, do the lookup only if there's an
* associated socket as indicated by the flowhash
*/
if (outgoing != 0 && m->m_pkthdr.pkt_flowsrc == FLOWSRC_INPCB) {
/*
* To avoid lock ordering issues we delay the proc UUID lookup
* to the BPF read as we cannot
* assume the socket lock is unlocked on output
*/
hdr->pth_flags |= PTH_FLAG_DELAY_PKTAP;
hdr->pth_flags |= PTH_FLAG_SOCKET;
hdr->pth_flowid = m->m_pkthdr.pkt_flowid;
if (m->m_pkthdr.pkt_flags & PKTF_FLOW_RAWSOCK) {
hdr->pth_ipproto = IPPROTO_RAW;
} else {
hdr->pth_ipproto = m->m_pkthdr.pkt_proto;
}
if (hdr->pth_ipproto == IPPROTO_TCP) {
hdr->pth_pid = m->m_pkthdr.tx_tcp_pid;
hdr->pth_epid = m->m_pkthdr.tx_tcp_e_pid;
} else if (hdr->pth_ipproto == IPPROTO_UDP) {
hdr->pth_pid = m->m_pkthdr.tx_udp_pid;
hdr->pth_epid = m->m_pkthdr.tx_udp_e_pid;
} else if (hdr->pth_ipproto == IPPROTO_RAW) {
hdr->pth_pid = m->m_pkthdr.tx_rawip_pid;
hdr->pth_epid = m->m_pkthdr.tx_rawip_e_pid;
}
if (hdr->pth_pid != 0 && hdr->pth_pid != -1) {
proc_name(hdr->pth_pid, hdr->pth_comm, MAXCOMLEN);
} else {
hdr->pth_pid = -1;
}
if (hdr->pth_epid != 0 && hdr->pth_epid != -1) {
hdr->pth_flags |= PTH_FLAG_PROC_DELEGATED;
proc_name(hdr->pth_epid, hdr->pth_ecomm, MAXCOMLEN);
} else {
hdr->pth_epid = -1;
}
if (m->m_pkthdr.pkt_flags & PKTF_NEW_FLOW) {
hdr->pth_flags |= PTH_FLAG_NEW_FLOW;
}
} else if (outgoing == 0) {
int found = 0;
struct so_procinfo soprocinfo;
struct inpcb *inp = NULL;
memset(&soprocinfo, 0, sizeof(struct so_procinfo));
if (proto == PF_INET) {
struct ip ip;
errno_t error;
size_t hlen;
struct in_addr faddr, laddr;
u_short fport = 0, lport = 0;
struct inpcbinfo *pcbinfo = NULL;
int wildcard = 0;
error = mbuf_copydata(m, pre, sizeof(struct ip), &ip);
if (error != 0) {
PKTAP_LOG(PKTP_LOG_ERROR,
"mbuf_copydata tcp v4 failed for %s\n",
hdr->pth_ifname);
goto done;
}
hlen = IP_VHL_HL(ip.ip_vhl) << 2;
faddr = ip.ip_src;
laddr = ip.ip_dst;
if (ip.ip_p == IPPROTO_TCP) {
struct tcphdr th;
error = mbuf_copydata(m, pre + hlen,
sizeof(struct tcphdr), &th);
if (error != 0) {
goto done;
}
fport = th.th_sport;
lport = th.th_dport;
pcbinfo = &tcbinfo;
} else if (ip.ip_p == IPPROTO_UDP) {
struct udphdr uh;
error = mbuf_copydata(m, pre + hlen,
sizeof(struct udphdr), &uh);
if (error != 0) {
PKTAP_LOG(PKTP_LOG_ERROR,
"mbuf_copydata udp v4 failed for %s\n",
hdr->pth_ifname);
goto done;
}
fport = uh.uh_sport;
lport = uh.uh_dport;
pcbinfo = &udbinfo;
wildcard = 1;
}
if (pcbinfo != NULL) {
inp = in_pcblookup_hash(pcbinfo, faddr, fport,
laddr, lport, wildcard, outgoing ? NULL : ifp);
if (inp == NULL && hdr->pth_iftype != IFT_LOOP) {
PKTAP_LOG(PKTP_LOG_NOPCB,
"in_pcblookup_hash no pcb %s\n",
hdr->pth_ifname);
}
} else {
PKTAP_LOG(PKTP_LOG_NOPCB,
"unknown ip_p %u on %s\n",
ip.ip_p, hdr->pth_ifname);
pktap_hexdump(PKTP_LOG_NOPCB, &ip, sizeof(struct ip));
}
} else if (proto == PF_INET6) {
struct ip6_hdr ip6;
errno_t error;
struct in6_addr *faddr;
struct in6_addr *laddr;
u_short fport = 0, lport = 0;
struct inpcbinfo *pcbinfo = NULL;
int wildcard = 0;
error = mbuf_copydata(m, pre, sizeof(struct ip6_hdr), &ip6);
if (error != 0) {
goto done;
}
faddr = &ip6.ip6_src;
laddr = &ip6.ip6_dst;
if (ip6.ip6_nxt == IPPROTO_TCP) {
struct tcphdr th;
error = mbuf_copydata(m, pre + sizeof(struct ip6_hdr),
sizeof(struct tcphdr), &th);
if (error != 0) {
PKTAP_LOG(PKTP_LOG_ERROR,
"mbuf_copydata tcp v6 failed for %s\n",
hdr->pth_ifname);
goto done;
}
fport = th.th_sport;
lport = th.th_dport;
pcbinfo = &tcbinfo;
} else if (ip6.ip6_nxt == IPPROTO_UDP) {
struct udphdr uh;
error = mbuf_copydata(m, pre + sizeof(struct ip6_hdr),
sizeof(struct udphdr), &uh);
if (error != 0) {
PKTAP_LOG(PKTP_LOG_ERROR,
"mbuf_copydata udp v6 failed for %s\n",
hdr->pth_ifname);
goto done;
}
fport = uh.uh_sport;
lport = uh.uh_dport;
pcbinfo = &udbinfo;
wildcard = 1;
}
if (pcbinfo != NULL) {
inp = in6_pcblookup_hash(pcbinfo, faddr, fport, ip6_input_getdstifscope(m),
laddr, lport, ip6_input_getsrcifscope(m), wildcard, outgoing ? NULL : ifp);
if (inp == NULL && hdr->pth_iftype != IFT_LOOP) {
PKTAP_LOG(PKTP_LOG_NOPCB,
"in6_pcblookup_hash no pcb %s\n",
hdr->pth_ifname);
}
} else {
PKTAP_LOG(PKTP_LOG_NOPCB,
"unknown ip6.ip6_nxt %u on %s\n",
ip6.ip6_nxt, hdr->pth_ifname);
pktap_hexdump(PKTP_LOG_NOPCB, &ip6, sizeof(struct ip6_hdr));
}
}
if (inp != NULL) {
hdr->pth_flags |= PTH_FLAG_SOCKET;
if (inp->inp_state != INPCB_STATE_DEAD && inp->inp_socket != NULL) {
found = 1;
inp_get_soprocinfo(inp, &soprocinfo);
}
in_pcb_checkstate(inp, WNT_RELEASE, 0);
}
done:
/*
* -1 means PID not found
*/
hdr->pth_pid = -1;
hdr->pth_epid = -1;
if (found != 0) {
pktap_set_procinfo(hdr, &soprocinfo);
}
}
}
__private_extern__ void
pktap_bpf_tap(struct ifnet *ifp, protocol_family_t proto, struct mbuf *m,
u_int32_t pre, u_int32_t post, int outgoing)
{
struct pktap_softc *pktap;
void (*bpf_tap_func)(ifnet_t, u_int32_t, mbuf_t, void *, size_t) =
outgoing ? bpf_tap_out : bpf_tap_in;
/*
* Skip the coprocessor interface
*/
if (!intcoproc_unrestricted && IFNET_IS_INTCOPROC(ifp)) {
return;
}
lck_rw_lock_shared(&pktap_lck_rw);
/*
* No need to take the ifnet_lock as the struct ifnet field if_bpf is
* protected by the BPF subsystem
*/
LIST_FOREACH(pktap, &pktap_list, pktp_link) {
int filter_result;
filter_result = pktap_filter_evaluate(pktap, ifp);
if (filter_result == PKTAP_FILTER_SKIP) {
continue;
}
if (pktap->pktp_dlt_raw_count > 0) {
/* We accept only IPv4 and IPv6 packets for the raw DLT */
if ((proto == AF_INET || proto == AF_INET6) &&
!(m->m_pkthdr.pkt_flags & PKTF_INET_RESOLVE)) {
/*
* We can play just with the length of the first mbuf in the
* chain because bpf_tap_imp() disregard the packet length
* of the mbuf packet header.
*/
if (mbuf_setdata(m, m_mtod_current(m) + pre, m->m_len - pre) == 0) {
bpf_tap_func(pktap->pktp_ifp, DLT_RAW, m, NULL, 0);
mbuf_setdata(m, m_mtod_current(m) - pre, m->m_len + pre);
}
}
}
if (pktap->pktp_dlt_pkttap_count > 0) {
struct {
struct pktap_header hdr;
u_int32_t proto;
} hdr_buffer;
struct pktap_header *hdr = &hdr_buffer.hdr;
size_t hdr_size = sizeof(struct pktap_header);
int unknown_if_type = 0;
size_t data_adjust = 0;
u_int32_t pre_adjust = 0;
/* Verify the structure is packed */
_CASSERT(sizeof(hdr_buffer) == sizeof(struct pktap_header) + sizeof(u_int32_t));
bzero(&hdr_buffer, sizeof(hdr_buffer));
hdr->pth_length = sizeof(struct pktap_header);
hdr->pth_type_next = PTH_TYPE_PACKET;
/*
* Set DLT of packet based on interface type
*/
switch (ifp->if_type) {
case IFT_LOOP:
case IFT_GIF:
case IFT_STF:
case IFT_CELLULAR:
/*
* Packets from pdp interfaces have no loopback
* header that contain the protocol number.
* As BPF just concatenate the header and the
* packet content in a single buffer,
* stash the protocol after the pktap header
* and adjust the size of the header accordingly
*/
hdr->pth_dlt = DLT_NULL;
if (pre == 0) {
hdr_buffer.proto = proto;
hdr_size = sizeof(hdr_buffer);
pre_adjust = sizeof(hdr_buffer.proto);
}
break;
case IFT_ETHER:
case IFT_BRIDGE:
case IFT_L2VLAN:
case IFT_IEEE8023ADLAG:
hdr->pth_dlt = DLT_EN10MB;
break;
case IFT_PPP:
hdr->pth_dlt = DLT_PPP;
break;
case IFT_IEEE1394:
hdr->pth_dlt = DLT_APPLE_IP_OVER_IEEE1394;
break;
case IFT_OTHER:
if (ifp->if_family == IFNET_FAMILY_IPSEC ||
ifp->if_family == IFNET_FAMILY_UTUN) {
/*
* For utun:
* - incoming packets do not have the prefix set to four
* - some packets are as small as two bytes!
*/
if (m_pktlen(m) < 4) {
goto done;
}
if (proto != AF_INET && proto != AF_INET6) {
goto done;
}
if (proto == AF_INET && (size_t) m_pktlen(m) - 4 < sizeof(struct ip)) {
goto done;
}
if (proto == AF_INET6 && (size_t) m_pktlen(m) - 4 < sizeof(struct ip6_hdr)) {
goto done;
}
/*
* Handle two cases:
* - The old utun encapsulation with the protocol family in network order
* - A raw IPv4 or IPv6 packet
*/
uint8_t data = *(uint8_t *)mbuf_data(m);
if ((data >> 4) == 4 || (data >> 4) == 6) {
pre = 4;
} else {
/*
* Skip the protocol in the mbuf as it's in network order
*/
pre = 4;
data_adjust = 4;
}
}
hdr->pth_dlt = DLT_NULL;
hdr_buffer.proto = proto;
hdr_size = sizeof(hdr_buffer);
break;
default:
if (pre == 0) {
hdr->pth_dlt = DLT_RAW;
} else {
unknown_if_type = 1;
}
break;
}
if (unknown_if_type) {
PKTAP_LOG(PKTP_LOG_FUNC,
"unknown if_type %u for %s\n",
ifp->if_type, ifp->if_xname);
pktap_count_unknown_if_type += 1;
} else {
strlcpy(hdr->pth_ifname, ifp->if_xname,
sizeof(hdr->pth_ifname));
hdr->pth_flags |= outgoing ? PTH_FLAG_DIR_OUT : PTH_FLAG_DIR_IN;
hdr->pth_protocol_family = proto;
hdr->pth_frame_pre_length = pre + pre_adjust;
hdr->pth_frame_post_length = post;
hdr->pth_iftype = ifp->if_type;
hdr->pth_ifunit = ifp->if_unit;
if (m->m_pkthdr.pkt_flags & PKTF_KEEPALIVE) {
hdr->pth_flags |= PTH_FLAG_KEEP_ALIVE;
}
if (m->m_pkthdr.pkt_flags & PKTF_TCP_REXMT) {
hdr->pth_flags |= PTH_FLAG_REXMIT;
}
if (m->m_pkthdr.pkt_flags & PKTF_WAKE_PKT) {
hdr->pth_flags |= PTH_FLAG_WAKE_PKT;
}
pktap_fill_proc_info(hdr, proto, m, pre, outgoing, ifp);
hdr->pth_svc = so_svc2tc(m->m_pkthdr.pkt_svc);
if (data_adjust == 0) {
bpf_tap_func(pktap->pktp_ifp, DLT_PKTAP, m, hdr, hdr_size);
} else {
/*
* We can play just with the length of the first mbuf in the
* chain because bpf_tap_imp() disregard the packet length
* of the mbuf packet header.
*/
if (mbuf_setdata(m, m_mtod_current(m) + data_adjust, m->m_len - data_adjust) == 0) {
bpf_tap_func(pktap->pktp_ifp, DLT_PKTAP, m, hdr, hdr_size);
mbuf_setdata(m, m_mtod_current(m) - data_adjust, m->m_len + data_adjust);
}
}
}
}
}
done:
lck_rw_done(&pktap_lck_rw);
}
__private_extern__ void
pktap_input(struct ifnet *ifp, protocol_family_t proto, struct mbuf *m,
char *frame_header)
{
char *hdr;
char *start;
/* Fast path */
if (pktap_total_tap_count == 0 ||
(m->m_pkthdr.pkt_flags & PKTF_SKIP_PKTAP) != 0) {
return;
}
hdr = (char *)mbuf_data(m);
start = (char *)mbuf_datastart(m);
/* Make sure the frame header is fully contained in the mbuf */
if (frame_header != NULL && frame_header >= start && frame_header <= hdr) {
size_t o_len = m->m_len;
u_int32_t pre = (u_int32_t)(hdr - frame_header);
if (mbuf_setdata(m, frame_header, o_len + pre) == 0) {
PKTAP_LOG(PKTP_LOG_INPUT, "ifp %s proto %u pre %u post %u\n",
ifp->if_xname, proto, pre, 0);
pktap_bpf_tap(ifp, proto, m, pre, 0, 0);
mbuf_setdata(m, hdr, o_len);
}
} else {
PKTAP_LOG(PKTP_LOG_INPUT, "ifp %s proto %u pre %u post %u\n",
ifp->if_xname, proto, 0, 0);
pktap_bpf_tap(ifp, proto, m, 0, 0, 0);
}
}
__private_extern__ void
pktap_output(struct ifnet *ifp, protocol_family_t proto, struct mbuf *m,
u_int32_t pre, u_int32_t post)
{
/* Fast path */
if (pktap_total_tap_count == 0 ||
(m->m_pkthdr.pkt_flags & PKTF_SKIP_PKTAP) != 0) {
return;
}
PKTAP_LOG(PKTP_LOG_OUTPUT, "ifp %s proto %u pre %u post %u\n",
ifp->if_xname, proto, pre, post);
pktap_bpf_tap(ifp, proto, m, pre, post, 1);
}
#if SKYWALK
typedef void (*tap_packet_func)(ifnet_t interface, u_int32_t dlt,
kern_packet_t packet, void *header, size_t header_len);
static void
pktap_bpf_tap_packet(struct ifnet *ifp, protocol_family_t proto, uint32_t dlt,
pid_t pid, const char * pname, pid_t epid, const char * epname,
kern_packet_t pkt, const void * header, size_t header_length,
uint8_t ipproto, uint32_t flowid, uint32_t flags, tap_packet_func tap_func)
{
struct {
struct pktap_header pkth;
union {
uint8_t llhdr[16];
uint32_t proto;
} extra;
} hdr_buffer;
struct pktap_header *hdr;
size_t hdr_size;
struct pktap_softc *pktap;
uint32_t pre_length = 0;
/*
* Skip the coprocessor interface
*/
if (!intcoproc_unrestricted && IFNET_IS_INTCOPROC(ifp)) {
return;
}
if (proto != AF_INET && proto != AF_INET6) {
PKTAP_LOG(PKTP_LOG_ERROR,
"unsupported protocol %d\n",
proto);
return;
}
/* assume that we'll be tapping using PKTAP */
hdr = &hdr_buffer.pkth;
bzero(&hdr_buffer, sizeof(hdr_buffer));
hdr->pth_length = sizeof(struct pktap_header);
hdr->pth_type_next = PTH_TYPE_PACKET;
hdr->pth_dlt = dlt;
hdr->pth_pid = pid;
if (pid != epid) {
hdr->pth_epid = epid;
} else {
hdr->pth_epid = -1;
}
if (pname != NULL) {
strlcpy(hdr->pth_comm, pname, sizeof(hdr->pth_comm));
}
if (epname != NULL) {
strlcpy(hdr->pth_ecomm, epname, sizeof(hdr->pth_ecomm));
}
strlcpy(hdr->pth_ifname, ifp->if_xname, sizeof(hdr->pth_ifname));
hdr->pth_flags |= flags;
hdr->pth_ipproto = ipproto;
hdr->pth_flowid = flowid;
/*
* Do the same as pktap_fill_proc_info() to defer looking up inpcb.
* We do it for both inbound and outbound packets unlike the mbuf case.
*/
if ((flags & PTH_FLAG_SOCKET) != 0 && ipproto != 0 && flowid != 0) {
hdr->pth_flags |= PTH_FLAG_DELAY_PKTAP;
}
if (kern_packet_get_wake_flag(pkt)) {
hdr->pth_flags |= PTH_FLAG_WAKE_PKT;
}
hdr->pth_trace_tag = kern_packet_get_trace_tag(pkt);
hdr->pth_protocol_family = proto;
hdr->pth_svc = so_svc2tc((mbuf_svc_class_t)
kern_packet_get_service_class(pkt));
hdr->pth_iftype = ifp->if_type;
hdr->pth_ifunit = ifp->if_unit;
hdr_size = sizeof(struct pktap_header);
if (header != NULL && header_length != 0) {
if (header_length > sizeof(hdr_buffer.extra.llhdr)) {
PKTAP_LOG(PKTP_LOG_ERROR,
"%s: header %d > %d\n",
if_name(ifp), (int)header_length,
(int)sizeof(hdr_buffer.extra.llhdr));
return;
}
bcopy(header, hdr_buffer.extra.llhdr, header_length);
hdr_size += header_length;
pre_length = (uint32_t)header_length;
} else if (dlt == DLT_RAW) {
/*
* Use the same DLT as has been used for the mbuf path
*/
hdr->pth_dlt = DLT_NULL;
hdr_buffer.extra.proto = proto;
hdr_size = sizeof(struct pktap_header) + sizeof(u_int32_t);
pre_length = sizeof(hdr_buffer.extra.proto);
} else if (dlt == DLT_EN10MB) {
pre_length = ETHER_HDR_LEN;
}
hdr->pth_frame_pre_length = pre_length;
lck_rw_lock_shared(&pktap_lck_rw);
/*
* No need to take the ifnet_lock as the struct ifnet field if_bpf is
* protected by the BPF subsystem
*/
LIST_FOREACH(pktap, &pktap_list, pktp_link) {
int filter_result;
filter_result = pktap_filter_evaluate(pktap, ifp);
if (filter_result == PKTAP_FILTER_SKIP) {
continue;
}
if (dlt == DLT_RAW && pktap->pktp_dlt_raw_count > 0) {
(*tap_func)(pktap->pktp_ifp, DLT_RAW, pkt, NULL, 0);
}
if (pktap->pktp_dlt_pkttap_count > 0) {
(*tap_func)(pktap->pktp_ifp, DLT_PKTAP,
pkt, hdr, hdr_size);
}
}
lck_rw_done(&pktap_lck_rw);
}
void
pktap_input_packet(struct ifnet *ifp, protocol_family_t proto, uint32_t dlt,
pid_t pid, const char * pname, pid_t epid, const char * epname,
kern_packet_t pkt, const void * header, size_t header_length,
uint8_t ipproto, uint32_t flowid, uint32_t flags)
{
/* Fast path */
if (pktap_total_tap_count == 0) {
return;
}
PKTAP_LOG(PKTP_LOG_INPUT, "IN %s proto %u pid %d epid %d\n",
ifp->if_xname, proto, pid, epid);
pktap_bpf_tap_packet(ifp, proto, dlt, pid, pname, epid, epname, pkt,
header, header_length, ipproto, flowid,
PTH_FLAG_DIR_IN | (flags & ~(PTH_FLAG_DIR_IN | PTH_FLAG_DIR_OUT)),
bpf_tap_packet_in);
}
void
pktap_output_packet(struct ifnet *ifp, protocol_family_t proto, uint32_t dlt,
pid_t pid, const char * pname, pid_t epid, const char * epname,
kern_packet_t pkt, const void * header, size_t header_length,
uint8_t ipproto, uint32_t flowid, uint32_t flags)
{
/* Fast path */
if (pktap_total_tap_count == 0) {
return;
}
PKTAP_LOG(PKTP_LOG_OUTPUT, "OUT %s proto %u pid %d epid %d\n",
ifp->if_xname, proto, pid, epid);
pktap_bpf_tap_packet(ifp, proto, dlt, pid, pname, epid, epname, pkt,
header, header_length, ipproto, flowid,
PTH_FLAG_DIR_OUT | (flags & ~(PTH_FLAG_DIR_IN | PTH_FLAG_DIR_OUT)),
bpf_tap_packet_out);
}
#endif /* SKYWALK */
void
convert_to_pktap_header_to_v2(struct bpf_packet *bpf_pkt, bool truncate)
{
struct pktap_header *pktap_header;
size_t extra_src_size;
struct pktap_buffer_v2_hdr_extra pktap_buffer_v2_hdr_extra;
struct pktap_v2_hdr_space *pktap_v2_hdr_space;
struct pktap_v2_hdr *pktap_v2_hdr;
uint8_t *ptr;
pktap_header = (struct pktap_header *)bpf_pkt->bpfp_header;
if (pktap_header->pth_type_next != PTH_TYPE_PACKET) {
return;
}
VERIFY(bpf_pkt->bpfp_header_length >= sizeof(struct pktap_header));
/*
* extra_src_size is the length of the optional link layer header
*/
extra_src_size = bpf_pkt->bpfp_header_length -
sizeof(struct pktap_header);
VERIFY(extra_src_size <= sizeof(union pktap_header_extra));
pktap_v2_hdr_space = &pktap_buffer_v2_hdr_extra.hdr_space;
pktap_v2_hdr = &pktap_v2_hdr_space->pth_hdr;
ptr = (uint8_t *) (pktap_v2_hdr + 1);
COPY_PKTAP_COMMON_FIELDS_TO_V2(pktap_v2_hdr, pktap_header);
/*
* When truncating don't bother with the process UUIDs
*/
if (!truncate) {
if ((pktap_header->pth_flags & PTH_FLAG_DELAY_PKTAP)) {
pktap_v2_hdr->pth_uuid_offset = pktap_v2_hdr->pth_length;
pktap_v2_hdr->pth_length += sizeof(uuid_t);
uuid_clear(*(uuid_t *)ptr);
ptr += sizeof(uuid_t);
VERIFY((void *)ptr < (void *)(pktap_v2_hdr_space + 1));
} else if (!uuid_is_null(pktap_header->pth_uuid)) {
pktap_v2_hdr->pth_uuid_offset = pktap_v2_hdr->pth_length;
uuid_copy(*(uuid_t *)ptr, pktap_header->pth_uuid);
pktap_v2_hdr->pth_length += sizeof(uuid_t);
ptr += sizeof(uuid_t);
VERIFY((void *)ptr < (void *)(pktap_v2_hdr_space + 1));
}
if ((pktap_header->pth_flags & PTH_FLAG_DELAY_PKTAP)) {
if (pktap_header->pth_flags & PTH_FLAG_PROC_DELEGATED) {
pktap_v2_hdr->pth_e_uuid_offset = pktap_v2_hdr->pth_length;
uuid_clear(*(uuid_t *)ptr);
pktap_v2_hdr->pth_length += sizeof(uuid_t);
ptr += sizeof(uuid_t);
VERIFY((void *)ptr < (void *)(pktap_v2_hdr_space + 1));
}
} else if (!uuid_is_null(pktap_header->pth_euuid)) {
pktap_v2_hdr->pth_e_uuid_offset = pktap_v2_hdr->pth_length;
uuid_copy(*(uuid_t *)ptr, pktap_header->pth_euuid);
pktap_v2_hdr->pth_length += sizeof(uuid_t);
ptr += sizeof(uuid_t);
VERIFY((void *)ptr < (void *)(pktap_v2_hdr_space + 1));
}
}
if (pktap_header->pth_ifname[0] != 0) {
size_t strsize;
pktap_v2_hdr->pth_ifname_offset = pktap_v2_hdr->pth_length;
/*
* Note: strlcpy() returns the length of the string so we need
* to add one for the end-of-string
*/
strsize = 1 + strlcpy((char *)ptr, pktap_header->pth_ifname,
sizeof(pktap_v2_hdr_space->pth_ifname));
pktap_v2_hdr->pth_length += strsize;
ptr += strsize;
VERIFY((void *)ptr < (void *)(pktap_v2_hdr_space + 1));
}
/*
* Do not waste space with the process name if we do not have a pid
*/
if (pktap_header->pth_pid != 0 && pktap_header->pth_pid != -1) {
if (pktap_header->pth_comm[0] != 0) {
size_t strsize;
pktap_v2_hdr->pth_comm_offset = pktap_v2_hdr->pth_length;
strsize = 1 + strlcpy((char *)ptr, pktap_header->pth_comm,
sizeof(pktap_v2_hdr_space->pth_comm));
pktap_v2_hdr->pth_length += strsize;
ptr += strsize;
VERIFY((void *)ptr < (void *)(pktap_v2_hdr_space + 1));
} else if ((pktap_header->pth_flags & PTH_FLAG_DELAY_PKTAP)) {
size_t strsize = sizeof(pktap_v2_hdr_space->pth_comm);
pktap_v2_hdr->pth_comm_offset = pktap_v2_hdr->pth_length;
*ptr = 0; /* empty string by default */
pktap_v2_hdr->pth_length += strsize;
ptr += strsize;
VERIFY((void *)ptr < (void *)(pktap_v2_hdr_space + 1));
}
}
/*
* Do not waste space with the effective process name if we do not have
* an effective pid or it's the same as the pid
*/
if (pktap_header->pth_epid != 0 && pktap_header->pth_epid != -1 &&
pktap_header->pth_epid != pktap_header->pth_pid) {
if (pktap_header->pth_ecomm[0] != 0) {
size_t strsize;
pktap_v2_hdr->pth_e_comm_offset = pktap_v2_hdr->pth_length;
strsize = 1 + strlcpy((char *)ptr, pktap_header->pth_ecomm,
sizeof(pktap_v2_hdr_space->pth_e_comm));
pktap_v2_hdr->pth_length += strsize;
ptr += strsize;
VERIFY((void *)ptr < (void *)(pktap_v2_hdr_space + 1));
} else if ((pktap_header->pth_flags & PTH_FLAG_DELAY_PKTAP)) {
size_t strsize = sizeof(pktap_v2_hdr_space->pth_e_comm);
pktap_v2_hdr->pth_e_comm_offset = pktap_v2_hdr->pth_length;
*ptr = 0; /* empty string by default */
pktap_v2_hdr->pth_length += strsize;
ptr += strsize;
VERIFY((void *)ptr < (void *)(pktap_v2_hdr_space + 1));
}
}
if (extra_src_size > 0) {
char *extra_src_ptr = (char *)(pktap_header + 1);
char *extra_dst_ptr = ((char *)pktap_v2_hdr) +
pktap_v2_hdr->pth_length;
VERIFY(pktap_v2_hdr->pth_length + extra_src_size <=
sizeof(struct pktap_buffer_v2_hdr_extra));
memcpy(extra_dst_ptr, extra_src_ptr, extra_src_size);
}
VERIFY(pktap_v2_hdr->pth_length + extra_src_size <=
bpf_pkt->bpfp_header_length);
memcpy(bpf_pkt->bpfp_header, pktap_v2_hdr,
pktap_v2_hdr->pth_length + extra_src_size);
bpf_pkt->bpfp_total_length += pktap_v2_hdr->pth_length -
sizeof(struct pktap_header);
bpf_pkt->bpfp_header_length += pktap_v2_hdr->pth_length -
sizeof(struct pktap_header);
}
Reference in a new issue Copy permalink