gems-kernel/source/THIRDPARTY/xnu/bsd/netinet/flow_divert.c
2024-06-03 11:29:39 -05:00

4866 lines
139 KiB
C

/*
* Copyright (c) 2012-2024 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 <string.h>
#include <sys/types.h>
#include <sys/syslog.h>
#include <sys/queue.h>
#include <sys/malloc.h>
#include <sys/socket.h>
#include <sys/kpi_mbuf.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/socketvar.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/kern_control.h>
#include <sys/ubc.h>
#include <sys/codesign.h>
#include <sys/file_internal.h>
#include <sys/kauth.h>
#include <libkern/tree.h>
#include <kern/locks.h>
#include <kern/debug.h>
#include <kern/task.h>
#include <mach/task_info.h>
#include <net/if_var.h>
#include <net/route.h>
#include <net/flowhash.h>
#include <net/ntstat.h>
#include <net/content_filter.h>
#include <net/necp.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/tcp.h>
#include <netinet/tcp_var.h>
#include <netinet/tcp_fsm.h>
#include <netinet/flow_divert.h>
#include <netinet/flow_divert_proto.h>
#include <netinet6/in6_pcb.h>
#include <netinet6/ip6protosw.h>
#include <dev/random/randomdev.h>
#include <libkern/crypto/sha1.h>
#include <libkern/crypto/crypto_internal.h>
#include <os/log.h>
#include <corecrypto/cc.h>
#if CONTENT_FILTER
#include <net/content_filter.h>
#endif /* CONTENT_FILTER */
#define FLOW_DIVERT_CONNECT_STARTED 0x00000001
#define FLOW_DIVERT_READ_CLOSED 0x00000002
#define FLOW_DIVERT_WRITE_CLOSED 0x00000004
#define FLOW_DIVERT_TUNNEL_RD_CLOSED 0x00000008
#define FLOW_DIVERT_TUNNEL_WR_CLOSED 0x00000010
#define FLOW_DIVERT_HAS_HMAC 0x00000040
#define FLOW_DIVERT_NOTIFY_ON_RECEIVED 0x00000080
#define FLOW_DIVERT_IMPLICIT_CONNECT 0x00000100
#define FLOW_DIVERT_DID_SET_LOCAL_ADDR 0x00000200
#define FLOW_DIVERT_HAS_TOKEN 0x00000400
#define FLOW_DIVERT_SHOULD_SET_LOCAL_ADDR 0x00000800
#define FLOW_DIVERT_FLOW_IS_TRANSPARENT 0x00001000
#define FDLOG(level, pcb, format, ...) \
os_log_with_type(OS_LOG_DEFAULT, flow_divert_syslog_type_to_oslog_type(level), "(%u): " format "\n", (pcb)->hash, __VA_ARGS__)
#define FDLOG0(level, pcb, msg) \
os_log_with_type(OS_LOG_DEFAULT, flow_divert_syslog_type_to_oslog_type(level), "(%u): " msg "\n", (pcb)->hash)
#define FDRETAIN(pcb) if ((pcb) != NULL) OSIncrementAtomic(&(pcb)->ref_count)
#define FDRELEASE(pcb) \
do { \
if ((pcb) != NULL && 1 == OSDecrementAtomic(&(pcb)->ref_count)) { \
flow_divert_pcb_destroy(pcb); \
} \
} while (0)
#define FDGRP_RETAIN(grp) if ((grp) != NULL) OSIncrementAtomic(&(grp)->ref_count)
#define FDGRP_RELEASE(grp) if ((grp) != NULL && 1 == OSDecrementAtomic(&(grp)->ref_count)) flow_divert_group_destroy(grp)
#define FDLOCK(pcb) lck_mtx_lock(&(pcb)->mtx)
#define FDUNLOCK(pcb) lck_mtx_unlock(&(pcb)->mtx)
#define FD_CTL_SENDBUFF_SIZE (128 * 1024)
#define GROUP_BIT_CTL_ENQUEUE_BLOCKED 0
#define GROUP_COUNT_MAX 31
#define FLOW_DIVERT_MAX_NAME_SIZE 4096
#define FLOW_DIVERT_MAX_KEY_SIZE 1024
#define FLOW_DIVERT_MAX_TRIE_MEMORY (1024 * 1024)
struct flow_divert_trie_node {
uint16_t start;
uint16_t length;
uint16_t child_map;
};
#define CHILD_MAP_SIZE 256
#define NULL_TRIE_IDX 0xffff
#define TRIE_NODE(t, i) ((t)->nodes[(i)])
#define TRIE_CHILD(t, i, b) (((t)->child_maps + (CHILD_MAP_SIZE * TRIE_NODE(t, i).child_map))[(b)])
#define TRIE_BYTE(t, i) ((t)->bytes[(i)])
#define SO_IS_DIVERTED(s) (((s)->so_flags & SOF_FLOW_DIVERT) && (s)->so_fd_pcb != NULL)
static struct flow_divert_pcb nil_pcb;
static LCK_ATTR_DECLARE(flow_divert_mtx_attr, 0, 0);
static LCK_GRP_DECLARE(flow_divert_mtx_grp, FLOW_DIVERT_CONTROL_NAME);
static LCK_RW_DECLARE_ATTR(g_flow_divert_group_lck, &flow_divert_mtx_grp,
&flow_divert_mtx_attr);
static TAILQ_HEAD(_flow_divert_group_list, flow_divert_group) g_flow_divert_in_process_group_list;
static struct flow_divert_group **g_flow_divert_groups = NULL;
static uint32_t g_active_group_count = 0;
static errno_t g_init_result = 0;
static kern_ctl_ref g_flow_divert_kctl_ref = NULL;
static struct protosw g_flow_divert_in_protosw;
static struct pr_usrreqs g_flow_divert_in_usrreqs;
static struct protosw g_flow_divert_in_udp_protosw;
static struct pr_usrreqs g_flow_divert_in_udp_usrreqs;
static struct ip6protosw g_flow_divert_in6_protosw;
static struct pr_usrreqs g_flow_divert_in6_usrreqs;
static struct ip6protosw g_flow_divert_in6_udp_protosw;
static struct pr_usrreqs g_flow_divert_in6_udp_usrreqs;
static struct protosw *g_tcp_protosw = NULL;
static struct ip6protosw *g_tcp6_protosw = NULL;
static struct protosw *g_udp_protosw = NULL;
static struct ip6protosw *g_udp6_protosw = NULL;
static KALLOC_TYPE_DEFINE(flow_divert_group_zone, struct flow_divert_group,
NET_KT_DEFAULT);
static KALLOC_TYPE_DEFINE(flow_divert_pcb_zone, struct flow_divert_pcb,
NET_KT_DEFAULT);
static errno_t
flow_divert_dup_addr(sa_family_t family, struct sockaddr *addr, struct sockaddr **dup);
static boolean_t
flow_divert_is_sockaddr_valid(struct sockaddr *addr);
static int
flow_divert_append_target_endpoint_tlv(mbuf_t connect_packet, struct sockaddr *toaddr);
struct sockaddr *
flow_divert_get_buffered_target_address(mbuf_t buffer);
static void
flow_divert_disconnect_socket(struct socket *so, bool is_connected, bool delay_if_needed);
static void flow_divert_group_destroy(struct flow_divert_group *group);
static inline uint8_t
flow_divert_syslog_type_to_oslog_type(int syslog_type)
{
switch (syslog_type) {
case LOG_ERR: return OS_LOG_TYPE_ERROR;
case LOG_INFO: return OS_LOG_TYPE_INFO;
case LOG_DEBUG: return OS_LOG_TYPE_DEBUG;
default: return OS_LOG_TYPE_DEFAULT;
}
}
static inline int
flow_divert_pcb_cmp(const struct flow_divert_pcb *pcb_a, const struct flow_divert_pcb *pcb_b)
{
return memcmp(&pcb_a->hash, &pcb_b->hash, sizeof(pcb_a->hash));
}
RB_PROTOTYPE(fd_pcb_tree, flow_divert_pcb, rb_link, flow_divert_pcb_cmp);
RB_GENERATE(fd_pcb_tree, flow_divert_pcb, rb_link, flow_divert_pcb_cmp);
static const char *
flow_divert_packet_type2str(uint8_t packet_type)
{
switch (packet_type) {
case FLOW_DIVERT_PKT_CONNECT:
return "connect";
case FLOW_DIVERT_PKT_CONNECT_RESULT:
return "connect result";
case FLOW_DIVERT_PKT_DATA:
return "data";
case FLOW_DIVERT_PKT_CLOSE:
return "close";
case FLOW_DIVERT_PKT_READ_NOTIFY:
return "read notification";
case FLOW_DIVERT_PKT_PROPERTIES_UPDATE:
return "properties update";
case FLOW_DIVERT_PKT_APP_MAP_CREATE:
return "app map create";
default:
return "unknown";
}
}
static struct flow_divert_pcb *
flow_divert_pcb_lookup(uint32_t hash, struct flow_divert_group *group)
{
struct flow_divert_pcb key_item;
struct flow_divert_pcb *fd_cb = NULL;
key_item.hash = hash;
lck_rw_lock_shared(&group->lck);
fd_cb = RB_FIND(fd_pcb_tree, &group->pcb_tree, &key_item);
FDRETAIN(fd_cb);
lck_rw_done(&group->lck);
return fd_cb;
}
static struct flow_divert_group *
flow_divert_group_lookup(uint32_t ctl_unit, struct flow_divert_pcb *fd_cb)
{
struct flow_divert_group *group = NULL;
lck_rw_lock_shared(&g_flow_divert_group_lck);
if (g_active_group_count == 0) {
if (fd_cb != NULL) {
FDLOG0(LOG_ERR, fd_cb, "No active groups, flow divert cannot be used for this socket");
}
} else if (ctl_unit == 0 || (ctl_unit >= GROUP_COUNT_MAX && ctl_unit < FLOW_DIVERT_IN_PROCESS_UNIT_MIN)) {
FDLOG(LOG_ERR, fd_cb, "Cannot lookup group with invalid control unit (%u)", ctl_unit);
} else if (ctl_unit < FLOW_DIVERT_IN_PROCESS_UNIT_MIN) {
if (g_flow_divert_groups == NULL) {
if (fd_cb != NULL) {
FDLOG0(LOG_ERR, fd_cb, "No active non-in-process groups, flow divert cannot be used for this socket");
}
} else {
group = g_flow_divert_groups[ctl_unit];
if (group == NULL) {
if (fd_cb != NULL) {
FDLOG(LOG_ERR, fd_cb, "Group for control unit %u is NULL, flow divert cannot be used for this socket", ctl_unit);
}
} else {
FDGRP_RETAIN(group);
}
}
} else {
if (TAILQ_EMPTY(&g_flow_divert_in_process_group_list)) {
if (fd_cb != NULL) {
FDLOG0(LOG_ERR, fd_cb, "No active in-process groups, flow divert cannot be used for this socket");
}
} else {
struct flow_divert_group *group_cursor = NULL;
TAILQ_FOREACH(group_cursor, &g_flow_divert_in_process_group_list, chain) {
if (group_cursor->ctl_unit == ctl_unit) {
group = group_cursor;
break;
}
}
if (group == NULL) {
if (fd_cb != NULL) {
FDLOG(LOG_ERR, fd_cb, "Group for control unit %u not found, flow divert cannot be used for this socket", ctl_unit);
}
} else if (fd_cb != NULL &&
(fd_cb->so == NULL ||
group_cursor->in_process_pid != fd_cb->so->last_pid)) {
FDLOG(LOG_ERR, fd_cb, "Cannot access group for control unit %u, mismatched PID (%u != %u)",
ctl_unit, group_cursor->in_process_pid, fd_cb->so ? fd_cb->so->last_pid : 0);
group = NULL;
} else {
FDGRP_RETAIN(group);
}
}
}
lck_rw_done(&g_flow_divert_group_lck);
return group;
}
static errno_t
flow_divert_pcb_insert(struct flow_divert_pcb *fd_cb, struct flow_divert_group *group)
{
int error = 0;
lck_rw_lock_exclusive(&group->lck);
if (!(group->flags & FLOW_DIVERT_GROUP_FLAG_DEFUNCT)) {
if (NULL == RB_INSERT(fd_pcb_tree, &group->pcb_tree, fd_cb)) {
fd_cb->group = group;
fd_cb->control_group_unit = group->ctl_unit;
FDRETAIN(fd_cb); /* The group now has a reference */
} else {
FDLOG(LOG_ERR, fd_cb, "Group %u already contains a PCB with hash %u", group->ctl_unit, fd_cb->hash);
error = EEXIST;
}
} else {
FDLOG(LOG_ERR, fd_cb, "Group %u is defunct, cannot insert", group->ctl_unit);
error = ENOENT;
}
lck_rw_done(&group->lck);
return error;
}
static errno_t
flow_divert_add_to_group(struct flow_divert_pcb *fd_cb, uint32_t ctl_unit)
{
errno_t error = 0;
struct flow_divert_group *group = NULL;
static uint32_t g_nextkey = 1;
static uint32_t g_hash_seed = 0;
int try_count = 0;
group = flow_divert_group_lookup(ctl_unit, fd_cb);
if (group == NULL) {
return ENOENT;
}
do {
uint32_t key[2];
uint32_t idx;
key[0] = g_nextkey++;
key[1] = RandomULong();
if (g_hash_seed == 0) {
g_hash_seed = RandomULong();
}
error = 0;
fd_cb->hash = net_flowhash(key, sizeof(key), g_hash_seed);
for (idx = 1; idx < GROUP_COUNT_MAX && error == 0; idx++) {
if (idx == ctl_unit) {
continue;
}
struct flow_divert_group *curr_group = flow_divert_group_lookup(idx, NULL);
if (curr_group != NULL) {
lck_rw_lock_shared(&curr_group->lck);
if (NULL != RB_FIND(fd_pcb_tree, &curr_group->pcb_tree, fd_cb)) {
error = EEXIST;
}
lck_rw_done(&curr_group->lck);
FDGRP_RELEASE(curr_group);
}
}
if (error == 0) {
error = flow_divert_pcb_insert(fd_cb, group);
}
} while (error == EEXIST && try_count++ < 3);
if (error == EEXIST) {
FDLOG0(LOG_ERR, fd_cb, "Failed to create a unique hash");
fd_cb->hash = 0;
}
FDGRP_RELEASE(group);
return error;
}
static struct flow_divert_pcb *
flow_divert_pcb_create(socket_t so)
{
struct flow_divert_pcb *new_pcb = NULL;
new_pcb = zalloc_flags(flow_divert_pcb_zone, Z_WAITOK | Z_ZERO);
lck_mtx_init(&new_pcb->mtx, &flow_divert_mtx_grp, &flow_divert_mtx_attr);
new_pcb->so = so;
new_pcb->log_level = nil_pcb.log_level;
FDRETAIN(new_pcb); /* Represents the socket's reference */
return new_pcb;
}
static void
flow_divert_pcb_destroy(struct flow_divert_pcb *fd_cb)
{
FDLOG(LOG_INFO, fd_cb, "Destroying, app tx %llu, tunnel tx %llu, tunnel rx %llu",
fd_cb->bytes_written_by_app, fd_cb->bytes_sent, fd_cb->bytes_received);
if (fd_cb->connect_token != NULL) {
mbuf_freem(fd_cb->connect_token);
}
if (fd_cb->connect_packet != NULL) {
mbuf_freem(fd_cb->connect_packet);
}
if (fd_cb->app_data != NULL) {
kfree_data(fd_cb->app_data, fd_cb->app_data_length);
}
if (fd_cb->original_remote_endpoint != NULL) {
free_sockaddr(fd_cb->original_remote_endpoint);
}
zfree(flow_divert_pcb_zone, fd_cb);
}
static void
flow_divert_pcb_remove(struct flow_divert_pcb *fd_cb)
{
if (fd_cb->group != NULL) {
struct flow_divert_group *group = fd_cb->group;
lck_rw_lock_exclusive(&group->lck);
FDLOG(LOG_INFO, fd_cb, "Removing from group %d, ref count = %d", group->ctl_unit, fd_cb->ref_count);
RB_REMOVE(fd_pcb_tree, &group->pcb_tree, fd_cb);
fd_cb->group = NULL;
FDRELEASE(fd_cb); /* Release the group's reference */
lck_rw_done(&group->lck);
}
}
static int
flow_divert_packet_init(struct flow_divert_pcb *fd_cb, uint8_t packet_type, mbuf_t *packet)
{
struct flow_divert_packet_header hdr;
int error = 0;
error = mbuf_gethdr(MBUF_DONTWAIT, MBUF_TYPE_HEADER, packet);
if (error) {
FDLOG(LOG_ERR, fd_cb, "failed to allocate the header mbuf: %d", error);
return error;
}
hdr.packet_type = packet_type;
hdr.conn_id = htonl(fd_cb->hash);
/* Lay down the header */
error = mbuf_copyback(*packet, 0, sizeof(hdr), &hdr, MBUF_DONTWAIT);
if (error) {
FDLOG(LOG_ERR, fd_cb, "mbuf_copyback(hdr) failed: %d", error);
mbuf_freem(*packet);
*packet = NULL;
return error;
}
return 0;
}
static int
flow_divert_packet_append_tlv(mbuf_t packet, uint8_t type, uint32_t length, const void *value)
{
uint32_t net_length = htonl(length);
int error = 0;
error = mbuf_copyback(packet, mbuf_pkthdr_len(packet), sizeof(type), &type, MBUF_DONTWAIT);
if (error) {
FDLOG(LOG_ERR, &nil_pcb, "failed to append the type (%d)", type);
return error;
}
error = mbuf_copyback(packet, mbuf_pkthdr_len(packet), sizeof(net_length), &net_length, MBUF_DONTWAIT);
if (error) {
FDLOG(LOG_ERR, &nil_pcb, "failed to append the length (%u)", length);
return error;
}
error = mbuf_copyback(packet, mbuf_pkthdr_len(packet), length, value, MBUF_DONTWAIT);
if (error) {
FDLOG0(LOG_ERR, &nil_pcb, "failed to append the value");
return error;
}
return error;
}
static int
flow_divert_packet_find_tlv(mbuf_t packet, int offset, uint8_t type, int *err, int next)
{
size_t cursor = offset;
int error = 0;
uint32_t curr_length;
uint8_t curr_type;
*err = 0;
do {
if (!next) {
error = mbuf_copydata(packet, cursor, sizeof(curr_type), &curr_type);
if (error) {
*err = ENOENT;
return -1;
}
} else {
next = 0;
curr_type = FLOW_DIVERT_TLV_NIL;
}
if (curr_type != type) {
cursor += sizeof(curr_type);
error = mbuf_copydata(packet, cursor, sizeof(curr_length), &curr_length);
if (error) {
*err = error;
return -1;
}
cursor += (sizeof(curr_length) + ntohl(curr_length));
}
} while (curr_type != type);
return (int)cursor;
}
static int
flow_divert_packet_get_tlv(mbuf_t packet, int offset, uint8_t type, size_t buff_len, void *buff, uint32_t *val_size)
{
int error = 0;
uint32_t length;
int tlv_offset;
tlv_offset = flow_divert_packet_find_tlv(packet, offset, type, &error, 0);
if (tlv_offset < 0) {
return error;
}
error = mbuf_copydata(packet, tlv_offset + sizeof(type), sizeof(length), &length);
if (error) {
return error;
}
length = ntohl(length);
uint32_t data_offset = tlv_offset + sizeof(type) + sizeof(length);
if (length > (mbuf_pkthdr_len(packet) - data_offset)) {
FDLOG(LOG_ERR, &nil_pcb, "Length of %u TLV (%u) is larger than remaining packet data (%lu)", type, length, (mbuf_pkthdr_len(packet) - data_offset));
return EINVAL;
}
if (val_size != NULL) {
*val_size = length;
}
if (buff != NULL && buff_len > 0) {
memset(buff, 0, buff_len);
size_t to_copy = (length < buff_len) ? length : buff_len;
error = mbuf_copydata(packet, data_offset, to_copy, buff);
if (error) {
return error;
}
}
return 0;
}
static int
flow_divert_packet_compute_hmac(mbuf_t packet, struct flow_divert_group *group, uint8_t *hmac)
{
mbuf_t curr_mbuf = packet;
if (g_crypto_funcs == NULL || group->token_key == NULL) {
return ENOPROTOOPT;
}
cchmac_di_decl(g_crypto_funcs->ccsha1_di, hmac_ctx);
g_crypto_funcs->cchmac_init_fn(g_crypto_funcs->ccsha1_di, hmac_ctx, group->token_key_size, group->token_key);
while (curr_mbuf != NULL) {
g_crypto_funcs->cchmac_update_fn(g_crypto_funcs->ccsha1_di, hmac_ctx, mbuf_len(curr_mbuf), mbuf_data(curr_mbuf));
curr_mbuf = mbuf_next(curr_mbuf);
}
g_crypto_funcs->cchmac_final_fn(g_crypto_funcs->ccsha1_di, hmac_ctx, hmac);
return 0;
}
static int
flow_divert_packet_verify_hmac(mbuf_t packet, uint32_t ctl_unit)
{
int error = 0;
struct flow_divert_group *group = NULL;
int hmac_offset;
uint8_t packet_hmac[SHA_DIGEST_LENGTH];
uint8_t computed_hmac[SHA_DIGEST_LENGTH];
mbuf_t tail;
group = flow_divert_group_lookup(ctl_unit, NULL);
if (group == NULL) {
FDLOG(LOG_ERR, &nil_pcb, "Failed to lookup group for control unit %u", ctl_unit);
return ENOPROTOOPT;
}
lck_rw_lock_shared(&group->lck);
if (group->token_key == NULL) {
error = ENOPROTOOPT;
goto done;
}
hmac_offset = flow_divert_packet_find_tlv(packet, 0, FLOW_DIVERT_TLV_HMAC, &error, 0);
if (hmac_offset < 0) {
goto done;
}
error = flow_divert_packet_get_tlv(packet, hmac_offset, FLOW_DIVERT_TLV_HMAC, sizeof(packet_hmac), packet_hmac, NULL);
if (error) {
goto done;
}
/* Chop off the HMAC TLV */
error = mbuf_split(packet, hmac_offset, MBUF_WAITOK, &tail);
if (error) {
goto done;
}
mbuf_free(tail);
error = flow_divert_packet_compute_hmac(packet, group, computed_hmac);
if (error) {
goto done;
}
if (cc_cmp_safe(sizeof(packet_hmac), packet_hmac, computed_hmac)) {
FDLOG0(LOG_WARNING, &nil_pcb, "HMAC in token does not match computed HMAC");
error = EINVAL;
goto done;
}
done:
if (group != NULL) {
lck_rw_done(&group->lck);
FDGRP_RELEASE(group);
}
return error;
}
static void
flow_divert_add_data_statistics(struct flow_divert_pcb *fd_cb, size_t data_len, Boolean send)
{
struct inpcb *inp = NULL;
struct ifnet *ifp = NULL;
Boolean cell = FALSE;
Boolean wifi = FALSE;
Boolean wired = FALSE;
inp = sotoinpcb(fd_cb->so);
if (inp == NULL) {
return;
}
if (inp->inp_vflag & INP_IPV4) {
ifp = inp->inp_last_outifp;
} else if (inp->inp_vflag & INP_IPV6) {
ifp = inp->in6p_last_outifp;
}
if (ifp != NULL) {
cell = IFNET_IS_CELLULAR(ifp);
wifi = (!cell && IFNET_IS_WIFI(ifp));
wired = (!wifi && IFNET_IS_WIRED(ifp));
}
if (send) {
INP_ADD_STAT(inp, cell, wifi, wired, txpackets, 1);
INP_ADD_STAT(inp, cell, wifi, wired, txbytes, data_len);
} else {
INP_ADD_STAT(inp, cell, wifi, wired, rxpackets, 1);
INP_ADD_STAT(inp, cell, wifi, wired, rxbytes, data_len);
}
inp_set_activity_bitmap(inp);
}
static errno_t
flow_divert_check_no_cellular(struct flow_divert_pcb *fd_cb)
{
struct inpcb *inp = sotoinpcb(fd_cb->so);
if (INP_NO_CELLULAR(inp)) {
struct ifnet *ifp = NULL;
if (inp->inp_vflag & INP_IPV4) {
ifp = inp->inp_last_outifp;
} else if (inp->inp_vflag & INP_IPV6) {
ifp = inp->in6p_last_outifp;
}
if (ifp != NULL && IFNET_IS_CELLULAR(ifp)) {
FDLOG0(LOG_ERR, fd_cb, "Cellular is denied");
return EHOSTUNREACH;
}
}
return 0;
}
static errno_t
flow_divert_check_no_expensive(struct flow_divert_pcb *fd_cb)
{
struct inpcb *inp = sotoinpcb(fd_cb->so);
if (INP_NO_EXPENSIVE(inp)) {
struct ifnet *ifp = NULL;
if (inp->inp_vflag & INP_IPV4) {
ifp = inp->inp_last_outifp;
} else if (inp->inp_vflag & INP_IPV6) {
ifp = inp->in6p_last_outifp;
}
if (ifp != NULL && IFNET_IS_EXPENSIVE(ifp)) {
FDLOG0(LOG_ERR, fd_cb, "Expensive is denied");
return EHOSTUNREACH;
}
}
return 0;
}
static errno_t
flow_divert_check_no_constrained(struct flow_divert_pcb *fd_cb)
{
struct inpcb *inp = sotoinpcb(fd_cb->so);
if (INP_NO_CONSTRAINED(inp)) {
struct ifnet *ifp = NULL;
if (inp->inp_vflag & INP_IPV4) {
ifp = inp->inp_last_outifp;
} else if (inp->inp_vflag & INP_IPV6) {
ifp = inp->in6p_last_outifp;
}
if (ifp != NULL && IFNET_IS_CONSTRAINED(ifp)) {
FDLOG0(LOG_ERR, fd_cb, "Constrained is denied");
return EHOSTUNREACH;
}
}
return 0;
}
static void
flow_divert_update_closed_state(struct flow_divert_pcb *fd_cb, int how, bool tunnel, bool flush_snd)
{
if (how != SHUT_RD) {
fd_cb->flags |= FLOW_DIVERT_WRITE_CLOSED;
if (tunnel || !(fd_cb->flags & FLOW_DIVERT_CONNECT_STARTED)) {
fd_cb->flags |= FLOW_DIVERT_TUNNEL_WR_CLOSED;
if (flush_snd) {
/* If the tunnel is not accepting writes any more, then flush the send buffer */
sbflush(&fd_cb->so->so_snd);
}
}
}
if (how != SHUT_WR) {
fd_cb->flags |= FLOW_DIVERT_READ_CLOSED;
if (tunnel || !(fd_cb->flags & FLOW_DIVERT_CONNECT_STARTED)) {
fd_cb->flags |= FLOW_DIVERT_TUNNEL_RD_CLOSED;
}
}
}
static uint16_t
trie_node_alloc(struct flow_divert_trie *trie)
{
if (trie->nodes_free_next < trie->nodes_count) {
uint16_t node_idx = trie->nodes_free_next++;
TRIE_NODE(trie, node_idx).child_map = NULL_TRIE_IDX;
return node_idx;
} else {
return NULL_TRIE_IDX;
}
}
static uint16_t
trie_child_map_alloc(struct flow_divert_trie *trie)
{
if (trie->child_maps_free_next < trie->child_maps_count) {
return trie->child_maps_free_next++;
} else {
return NULL_TRIE_IDX;
}
}
static uint16_t
trie_bytes_move(struct flow_divert_trie *trie, uint16_t bytes_idx, size_t bytes_size)
{
uint16_t start = trie->bytes_free_next;
if (start + bytes_size <= trie->bytes_count) {
if (start != bytes_idx) {
memmove(&TRIE_BYTE(trie, start), &TRIE_BYTE(trie, bytes_idx), bytes_size);
}
trie->bytes_free_next += bytes_size;
return start;
} else {
return NULL_TRIE_IDX;
}
}
static uint16_t
flow_divert_trie_insert(struct flow_divert_trie *trie, uint16_t string_start, size_t string_len)
{
uint16_t current = trie->root;
uint16_t child = trie->root;
uint16_t string_end = string_start + (uint16_t)string_len;
uint16_t string_idx = string_start;
uint16_t string_remainder = (uint16_t)string_len;
while (child != NULL_TRIE_IDX) {
uint16_t parent = current;
uint16_t node_idx;
uint16_t current_end;
current = child;
child = NULL_TRIE_IDX;
current_end = TRIE_NODE(trie, current).start + TRIE_NODE(trie, current).length;
for (node_idx = TRIE_NODE(trie, current).start;
node_idx < current_end &&
string_idx < string_end &&
TRIE_BYTE(trie, node_idx) == TRIE_BYTE(trie, string_idx);
node_idx++, string_idx++) {
;
}
string_remainder = string_end - string_idx;
if (node_idx < (TRIE_NODE(trie, current).start + TRIE_NODE(trie, current).length)) {
/*
* We did not reach the end of the current node's string.
* We need to split the current node into two:
* 1. A new node that contains the prefix of the node that matches
* the prefix of the string being inserted.
* 2. The current node modified to point to the remainder
* of the current node's string.
*/
uint16_t prefix = trie_node_alloc(trie);
if (prefix == NULL_TRIE_IDX) {
FDLOG0(LOG_ERR, &nil_pcb, "Ran out of trie nodes while splitting an existing node");
return NULL_TRIE_IDX;
}
/*
* Prefix points to the portion of the current nodes's string that has matched
* the input string thus far.
*/
TRIE_NODE(trie, prefix).start = TRIE_NODE(trie, current).start;
TRIE_NODE(trie, prefix).length = (node_idx - TRIE_NODE(trie, current).start);
/*
* Prefix has the current node as the child corresponding to the first byte
* after the split.
*/
TRIE_NODE(trie, prefix).child_map = trie_child_map_alloc(trie);
if (TRIE_NODE(trie, prefix).child_map == NULL_TRIE_IDX) {
FDLOG0(LOG_ERR, &nil_pcb, "Ran out of child maps while splitting an existing node");
return NULL_TRIE_IDX;
}
TRIE_CHILD(trie, prefix, TRIE_BYTE(trie, node_idx)) = current;
/* Parent has the prefix as the child correspoding to the first byte in the prefix */
TRIE_CHILD(trie, parent, TRIE_BYTE(trie, TRIE_NODE(trie, prefix).start)) = prefix;
/* Current node is adjusted to point to the remainder */
TRIE_NODE(trie, current).start = node_idx;
TRIE_NODE(trie, current).length -= TRIE_NODE(trie, prefix).length;
/* We want to insert the new leaf (if any) as a child of the prefix */
current = prefix;
}
if (string_remainder > 0) {
/*
* We still have bytes in the string that have not been matched yet.
* If the current node has children, iterate to the child corresponding
* to the next byte in the string.
*/
if (TRIE_NODE(trie, current).child_map != NULL_TRIE_IDX) {
child = TRIE_CHILD(trie, current, TRIE_BYTE(trie, string_idx));
}
}
} /* while (child != NULL_TRIE_IDX) */
if (string_remainder > 0) {
/* Add a new leaf containing the remainder of the string */
uint16_t leaf = trie_node_alloc(trie);
if (leaf == NULL_TRIE_IDX) {
FDLOG0(LOG_ERR, &nil_pcb, "Ran out of trie nodes while inserting a new leaf");
return NULL_TRIE_IDX;
}
TRIE_NODE(trie, leaf).start = trie_bytes_move(trie, string_idx, string_remainder);
if (TRIE_NODE(trie, leaf).start == NULL_TRIE_IDX) {
FDLOG0(LOG_ERR, &nil_pcb, "Ran out of bytes while inserting a new leaf");
return NULL_TRIE_IDX;
}
TRIE_NODE(trie, leaf).length = string_remainder;
/* Set the new leaf as the child of the current node */
if (TRIE_NODE(trie, current).child_map == NULL_TRIE_IDX) {
TRIE_NODE(trie, current).child_map = trie_child_map_alloc(trie);
if (TRIE_NODE(trie, current).child_map == NULL_TRIE_IDX) {
FDLOG0(LOG_ERR, &nil_pcb, "Ran out of child maps while inserting a new leaf");
return NULL_TRIE_IDX;
}
}
TRIE_CHILD(trie, current, TRIE_BYTE(trie, TRIE_NODE(trie, leaf).start)) = leaf;
current = leaf;
} /* else duplicate or this string is a prefix of one of the existing strings */
return current;
}
#define APPLE_WEBCLIP_ID_PREFIX "com.apple.webapp"
static uint16_t
flow_divert_trie_search(struct flow_divert_trie *trie, const uint8_t *string_bytes)
{
uint16_t current = trie->root;
uint16_t string_idx = 0;
while (current != NULL_TRIE_IDX) {
uint16_t next = NULL_TRIE_IDX;
uint16_t node_end = TRIE_NODE(trie, current).start + TRIE_NODE(trie, current).length;
uint16_t node_idx;
for (node_idx = TRIE_NODE(trie, current).start;
node_idx < node_end && string_bytes[string_idx] != '\0' && string_bytes[string_idx] == TRIE_BYTE(trie, node_idx);
node_idx++, string_idx++) {
;
}
if (node_idx == node_end) {
if (string_bytes[string_idx] == '\0') {
return current; /* Got an exact match */
} else if (string_idx == strlen(APPLE_WEBCLIP_ID_PREFIX) &&
0 == strncmp((const char *)string_bytes, APPLE_WEBCLIP_ID_PREFIX, string_idx)) {
return current; /* Got an apple webclip id prefix match */
} else if (TRIE_NODE(trie, current).child_map != NULL_TRIE_IDX) {
next = TRIE_CHILD(trie, current, string_bytes[string_idx]);
}
}
current = next;
}
return NULL_TRIE_IDX;
}
struct uuid_search_info {
uuid_t target_uuid;
char *found_signing_id;
boolean_t found_multiple_signing_ids;
proc_t found_proc;
};
static int
flow_divert_find_proc_by_uuid_callout(proc_t p, void *arg)
{
struct uuid_search_info *info = (struct uuid_search_info *)arg;
int result = PROC_RETURNED_DONE; /* By default, we didn't find the process */
if (info->found_signing_id != NULL) {
if (!info->found_multiple_signing_ids) {
/* All processes that were found had the same signing identifier, so just claim this first one and be done. */
info->found_proc = p;
result = PROC_CLAIMED_DONE;
} else {
uuid_string_t uuid_str;
uuid_unparse(info->target_uuid, uuid_str);
FDLOG(LOG_WARNING, &nil_pcb, "Found multiple processes with UUID %s with different signing identifiers", uuid_str);
}
kfree_data(info->found_signing_id, strlen(info->found_signing_id) + 1);
info->found_signing_id = NULL;
}
if (result == PROC_RETURNED_DONE) {
uuid_string_t uuid_str;
uuid_unparse(info->target_uuid, uuid_str);
FDLOG(LOG_WARNING, &nil_pcb, "Failed to find a process with UUID %s", uuid_str);
}
return result;
}
static int
flow_divert_find_proc_by_uuid_filter(proc_t p, void *arg)
{
struct uuid_search_info *info = (struct uuid_search_info *)arg;
int include = 0;
if (info->found_multiple_signing_ids) {
return include;
}
include = (uuid_compare(proc_executableuuid_addr(p), info->target_uuid) == 0);
if (include) {
const char *signing_id = cs_identity_get(p);
if (signing_id != NULL) {
FDLOG(LOG_INFO, &nil_pcb, "Found process %d with signing identifier %s", proc_getpid(p), signing_id);
size_t signing_id_size = strlen(signing_id) + 1;
if (info->found_signing_id == NULL) {
info->found_signing_id = kalloc_data(signing_id_size, Z_WAITOK);
memcpy(info->found_signing_id, signing_id, signing_id_size);
} else if (memcmp(signing_id, info->found_signing_id, signing_id_size)) {
info->found_multiple_signing_ids = TRUE;
}
} else {
info->found_multiple_signing_ids = TRUE;
}
include = !info->found_multiple_signing_ids;
}
return include;
}
static proc_t
flow_divert_find_proc_by_uuid(uuid_t uuid)
{
struct uuid_search_info info;
if (LOG_INFO <= nil_pcb.log_level) {
uuid_string_t uuid_str;
uuid_unparse(uuid, uuid_str);
FDLOG(LOG_INFO, &nil_pcb, "Looking for process with UUID %s", uuid_str);
}
memset(&info, 0, sizeof(info));
info.found_proc = PROC_NULL;
uuid_copy(info.target_uuid, uuid);
proc_iterate(PROC_ALLPROCLIST, flow_divert_find_proc_by_uuid_callout, &info, flow_divert_find_proc_by_uuid_filter, &info);
return info.found_proc;
}
static int
flow_divert_add_proc_info(struct flow_divert_pcb *fd_cb, proc_t proc, const char *signing_id, mbuf_t connect_packet, bool is_effective)
{
int error = 0;
uint8_t *cdhash = NULL;
audit_token_t audit_token = {};
const char *proc_cs_id = signing_id;
proc_lock(proc);
if (proc_cs_id == NULL) {
if (proc_getcsflags(proc) & (CS_VALID | CS_DEBUGGED)) {
proc_cs_id = cs_identity_get(proc);
} else {
FDLOG0(LOG_ERR, fd_cb, "Signature of proc is invalid");
}
}
if (is_effective) {
lck_rw_lock_shared(&fd_cb->group->lck);
if (!(fd_cb->group->flags & FLOW_DIVERT_GROUP_FLAG_NO_APP_MAP)) {
if (proc_cs_id != NULL) {
uint16_t result = flow_divert_trie_search(&fd_cb->group->signing_id_trie, (const uint8_t *)proc_cs_id);
if (result == NULL_TRIE_IDX) {
FDLOG(LOG_WARNING, fd_cb, "%s did not match", proc_cs_id);
error = EPERM;
} else {
FDLOG(LOG_INFO, fd_cb, "%s matched", proc_cs_id);
}
} else {
error = EPERM;
}
}
lck_rw_done(&fd_cb->group->lck);
}
if (error != 0) {
goto done;
}
/*
* If signing_id is not NULL then it came from the flow divert token and will be added
* as part of the token, so there is no need to add it here.
*/
if (signing_id == NULL && proc_cs_id != NULL) {
error = flow_divert_packet_append_tlv(connect_packet,
(is_effective ? FLOW_DIVERT_TLV_SIGNING_ID : FLOW_DIVERT_TLV_APP_REAL_SIGNING_ID),
(uint32_t)strlen(proc_cs_id),
proc_cs_id);
if (error != 0) {
FDLOG(LOG_ERR, fd_cb, "failed to append the signing ID: %d", error);
goto done;
}
}
cdhash = cs_get_cdhash(proc);
if (cdhash != NULL) {
error = flow_divert_packet_append_tlv(connect_packet,
(is_effective ? FLOW_DIVERT_TLV_CDHASH : FLOW_DIVERT_TLV_APP_REAL_CDHASH),
SHA1_RESULTLEN,
cdhash);
if (error) {
FDLOG(LOG_ERR, fd_cb, "failed to append the cdhash: %d", error);
goto done;
}
} else {
FDLOG0(LOG_ERR, fd_cb, "failed to get the cdhash");
}
task_t task = proc_task(proc);
if (task != TASK_NULL) {
mach_msg_type_number_t count = TASK_AUDIT_TOKEN_COUNT;
kern_return_t rc = task_info(task, TASK_AUDIT_TOKEN, (task_info_t)&audit_token, &count);
if (rc == KERN_SUCCESS) {
int append_error = flow_divert_packet_append_tlv(connect_packet,
(is_effective ? FLOW_DIVERT_TLV_APP_AUDIT_TOKEN : FLOW_DIVERT_TLV_APP_REAL_AUDIT_TOKEN),
sizeof(audit_token_t),
&audit_token);
if (append_error) {
FDLOG(LOG_ERR, fd_cb, "failed to append app audit token: %d", append_error);
}
}
}
done:
proc_unlock(proc);
return error;
}
static int
flow_divert_add_all_proc_info(struct flow_divert_pcb *fd_cb, struct socket *so, proc_t proc, const char *signing_id, mbuf_t connect_packet)
{
int error = 0;
proc_t effective_proc = PROC_NULL;
proc_t responsible_proc = PROC_NULL;
proc_t real_proc = proc_find(so->last_pid);
bool release_real_proc = true;
proc_t src_proc = PROC_NULL;
proc_t real_src_proc = PROC_NULL;
if (real_proc == PROC_NULL) {
FDLOG(LOG_ERR, fd_cb, "failed to find the real proc record for %d", so->last_pid);
release_real_proc = false;
real_proc = proc;
if (real_proc == PROC_NULL) {
real_proc = current_proc();
}
}
if (so->so_flags & SOF_DELEGATED) {
if (proc_getpid(real_proc) != so->e_pid) {
effective_proc = proc_find(so->e_pid);
} else if (uuid_compare(proc_executableuuid_addr(real_proc), so->e_uuid)) {
effective_proc = flow_divert_find_proc_by_uuid(so->e_uuid);
}
}
#if defined(XNU_TARGET_OS_OSX)
lck_rw_lock_shared(&fd_cb->group->lck);
if (!(fd_cb->group->flags & FLOW_DIVERT_GROUP_FLAG_NO_APP_MAP)) {
if (so->so_rpid > 0) {
responsible_proc = proc_find(so->so_rpid);
}
}
lck_rw_done(&fd_cb->group->lck);
#endif
real_src_proc = real_proc;
if (responsible_proc != PROC_NULL) {
src_proc = responsible_proc;
if (effective_proc != NULL) {
real_src_proc = effective_proc;
}
} else if (effective_proc != PROC_NULL) {
src_proc = effective_proc;
} else {
src_proc = real_proc;
}
error = flow_divert_add_proc_info(fd_cb, src_proc, signing_id, connect_packet, true);
if (error != 0) {
goto done;
}
if (real_src_proc != NULL && real_src_proc != src_proc) {
error = flow_divert_add_proc_info(fd_cb, real_src_proc, NULL, connect_packet, false);
if (error != 0) {
goto done;
}
}
done:
if (responsible_proc != PROC_NULL) {
proc_rele(responsible_proc);
}
if (effective_proc != PROC_NULL) {
proc_rele(effective_proc);
}
if (real_proc != PROC_NULL && release_real_proc) {
proc_rele(real_proc);
}
return error;
}
static int
flow_divert_send_packet(struct flow_divert_pcb *fd_cb, mbuf_t packet)
{
int error;
if (fd_cb->group == NULL) {
FDLOG0(LOG_INFO, fd_cb, "no provider, cannot send packet");
flow_divert_update_closed_state(fd_cb, SHUT_RDWR, true, false);
flow_divert_disconnect_socket(fd_cb->so, !(fd_cb->flags & FLOW_DIVERT_IMPLICIT_CONNECT), false);
if (SOCK_TYPE(fd_cb->so) == SOCK_STREAM) {
error = ECONNABORTED;
} else {
error = EHOSTUNREACH;
}
fd_cb->so->so_error = (uint16_t)error;
return error;
}
lck_rw_lock_shared(&fd_cb->group->lck);
if (MBUFQ_EMPTY(&fd_cb->group->send_queue)) {
error = ctl_enqueuembuf(g_flow_divert_kctl_ref, fd_cb->group->ctl_unit, packet, CTL_DATA_EOR);
if (error) {
FDLOG(LOG_NOTICE, &nil_pcb, "flow_divert_send_packet: ctl_enqueuembuf returned an error: %d", error);
}
} else {
error = ENOBUFS;
}
if (error == ENOBUFS) {
if (!lck_rw_lock_shared_to_exclusive(&fd_cb->group->lck)) {
lck_rw_lock_exclusive(&fd_cb->group->lck);
}
MBUFQ_ENQUEUE(&fd_cb->group->send_queue, packet);
error = 0;
OSTestAndSet(GROUP_BIT_CTL_ENQUEUE_BLOCKED, &fd_cb->group->atomic_bits);
}
lck_rw_done(&fd_cb->group->lck);
return error;
}
static void
flow_divert_append_domain_name(char *domain_name, void *ctx)
{
mbuf_t packet = (mbuf_t)ctx;
size_t domain_name_length = 0;
if (packet == NULL || domain_name == NULL) {
return;
}
domain_name_length = strlen(domain_name);
if (domain_name_length > 0 && domain_name_length < FLOW_DIVERT_MAX_NAME_SIZE) {
int error = flow_divert_packet_append_tlv(packet, FLOW_DIVERT_TLV_TARGET_HOSTNAME, (uint32_t)domain_name_length, domain_name);
if (error) {
FDLOG(LOG_ERR, &nil_pcb, "Failed to append %s: %d", domain_name, error);
}
}
}
static int
flow_divert_create_connect_packet(struct flow_divert_pcb *fd_cb, struct sockaddr *to, struct socket *so, proc_t p, mbuf_t *out_connect_packet)
{
int error = 0;
int flow_type = 0;
char *signing_id = NULL;
uint32_t sid_size = 0;
mbuf_t connect_packet = NULL;
cfil_sock_id_t cfil_sock_id = CFIL_SOCK_ID_NONE;
const void *cfil_id = NULL;
size_t cfil_id_size = 0;
struct inpcb *inp = sotoinpcb(so);
struct ifnet *ifp = NULL;
uint32_t flags = 0;
error = flow_divert_packet_init(fd_cb, FLOW_DIVERT_PKT_CONNECT, &connect_packet);
if (error) {
goto done;
}
if (fd_cb->connect_token != NULL && (fd_cb->flags & FLOW_DIVERT_HAS_HMAC)) {
int find_error = flow_divert_packet_get_tlv(fd_cb->connect_token, 0, FLOW_DIVERT_TLV_SIGNING_ID, 0, NULL, &sid_size);
if (find_error == 0 && sid_size > 0) {
signing_id = kalloc_data(sid_size + 1, Z_WAITOK | Z_ZERO);
if (signing_id != NULL) {
flow_divert_packet_get_tlv(fd_cb->connect_token, 0, FLOW_DIVERT_TLV_SIGNING_ID, sid_size, signing_id, NULL);
FDLOG(LOG_INFO, fd_cb, "Got %s from token", signing_id);
}
}
}
error = flow_divert_add_all_proc_info(fd_cb, so, p, signing_id, connect_packet);
if (signing_id != NULL) {
kfree_data(signing_id, sid_size + 1);
}
if (error) {
FDLOG(LOG_ERR, fd_cb, "Failed to add source proc info: %d", error);
goto done;
}
error = flow_divert_packet_append_tlv(connect_packet,
FLOW_DIVERT_TLV_TRAFFIC_CLASS,
sizeof(fd_cb->so->so_traffic_class),
&fd_cb->so->so_traffic_class);
if (error) {
goto done;
}
if (SOCK_TYPE(fd_cb->so) == SOCK_STREAM) {
flow_type = FLOW_DIVERT_FLOW_TYPE_TCP;
} else if (SOCK_TYPE(fd_cb->so) == SOCK_DGRAM) {
flow_type = FLOW_DIVERT_FLOW_TYPE_UDP;
} else {
error = EINVAL;
goto done;
}
error = flow_divert_packet_append_tlv(connect_packet,
FLOW_DIVERT_TLV_FLOW_TYPE,
sizeof(flow_type),
&flow_type);
if (error) {
goto done;
}
if (fd_cb->connect_token != NULL) {
unsigned int token_len = m_length(fd_cb->connect_token);
mbuf_concatenate(connect_packet, fd_cb->connect_token);
mbuf_pkthdr_adjustlen(connect_packet, token_len);
fd_cb->connect_token = NULL;
} else {
error = flow_divert_append_target_endpoint_tlv(connect_packet, to);
if (error) {
goto done;
}
necp_with_inp_domain_name(so, connect_packet, flow_divert_append_domain_name);
}
if (fd_cb->local_endpoint.sa.sa_family == AF_INET || fd_cb->local_endpoint.sa.sa_family == AF_INET6) {
error = flow_divert_packet_append_tlv(connect_packet, FLOW_DIVERT_TLV_LOCAL_ADDR, fd_cb->local_endpoint.sa.sa_len, &(fd_cb->local_endpoint.sa));
if (error) {
goto done;
}
}
if (inp->inp_vflag & INP_IPV4) {
ifp = inp->inp_last_outifp;
} else if (inp->inp_vflag & INP_IPV6) {
ifp = inp->in6p_last_outifp;
}
if (ifp != NULL) {
uint32_t flow_if_index = ifp->if_index;
error = flow_divert_packet_append_tlv(connect_packet, FLOW_DIVERT_TLV_OUT_IF_INDEX,
sizeof(flow_if_index), &flow_if_index);
if (error) {
goto done;
}
}
if (so->so_flags1 & SOF1_DATA_IDEMPOTENT) {
flags |= FLOW_DIVERT_TOKEN_FLAG_TFO;
}
if ((inp->inp_flags & INP_BOUND_IF) ||
((inp->inp_vflag & INP_IPV6) && !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) ||
((inp->inp_vflag & INP_IPV4) && inp->inp_laddr.s_addr != INADDR_ANY)) {
flags |= FLOW_DIVERT_TOKEN_FLAG_BOUND;
}
if (flags != 0) {
error = flow_divert_packet_append_tlv(connect_packet, FLOW_DIVERT_TLV_FLAGS, sizeof(flags), &flags);
if (error) {
goto done;
}
}
if (SOCK_TYPE(so) == SOCK_DGRAM) {
cfil_sock_id = cfil_sock_id_from_datagram_socket(so, NULL, to);
} else {
cfil_sock_id = cfil_sock_id_from_socket(so);
}
if (cfil_sock_id != CFIL_SOCK_ID_NONE) {
cfil_id = &cfil_sock_id;
cfil_id_size = sizeof(cfil_sock_id);
} else if (so->so_flags1 & SOF1_CONTENT_FILTER_SKIP) {
cfil_id = &inp->necp_client_uuid;
cfil_id_size = sizeof(inp->necp_client_uuid);
}
if (cfil_id != NULL && cfil_id_size > 0 && cfil_id_size <= sizeof(uuid_t)) {
error = flow_divert_packet_append_tlv(connect_packet, FLOW_DIVERT_TLV_CFIL_ID, (uint32_t)cfil_id_size, cfil_id);
if (error) {
goto done;
}
}
done:
if (!error) {
*out_connect_packet = connect_packet;
} else if (connect_packet != NULL) {
mbuf_freem(connect_packet);
}
return error;
}
static int
flow_divert_send_connect_packet(struct flow_divert_pcb *fd_cb)
{
int error = 0;
mbuf_t connect_packet = fd_cb->connect_packet;
mbuf_t saved_connect_packet = NULL;
if (connect_packet != NULL) {
error = mbuf_copym(connect_packet, 0, mbuf_pkthdr_len(connect_packet), MBUF_DONTWAIT, &saved_connect_packet);
if (error) {
FDLOG0(LOG_ERR, fd_cb, "Failed to copy the connect packet");
goto done;
}
error = flow_divert_send_packet(fd_cb, connect_packet);
if (error) {
goto done;
}
fd_cb->connect_packet = saved_connect_packet;
saved_connect_packet = NULL;
} else {
error = ENOENT;
}
done:
if (saved_connect_packet != NULL) {
mbuf_freem(saved_connect_packet);
}
return error;
}
static int
flow_divert_send_connect_result(struct flow_divert_pcb *fd_cb)
{
int error = 0;
mbuf_t packet = NULL;
int rbuff_space = 0;
error = flow_divert_packet_init(fd_cb, FLOW_DIVERT_PKT_CONNECT_RESULT, &packet);
if (error) {
FDLOG(LOG_ERR, fd_cb, "failed to create a connect result packet: %d", error);
goto done;
}
rbuff_space = fd_cb->so->so_rcv.sb_hiwat;
if (rbuff_space < 0) {
rbuff_space = 0;
}
rbuff_space = htonl(rbuff_space);
error = flow_divert_packet_append_tlv(packet,
FLOW_DIVERT_TLV_SPACE_AVAILABLE,
sizeof(rbuff_space),
&rbuff_space);
if (error) {
goto done;
}
if (fd_cb->local_endpoint.sa.sa_family == AF_INET || fd_cb->local_endpoint.sa.sa_family == AF_INET6) {
error = flow_divert_packet_append_tlv(packet, FLOW_DIVERT_TLV_LOCAL_ADDR, fd_cb->local_endpoint.sa.sa_len, &(fd_cb->local_endpoint.sa));
if (error) {
goto done;
}
}
error = flow_divert_send_packet(fd_cb, packet);
if (error) {
goto done;
}
done:
if (error && packet != NULL) {
mbuf_freem(packet);
}
return error;
}
static int
flow_divert_send_close(struct flow_divert_pcb *fd_cb, int how)
{
int error = 0;
mbuf_t packet = NULL;
uint32_t zero = 0;
error = flow_divert_packet_init(fd_cb, FLOW_DIVERT_PKT_CLOSE, &packet);
if (error) {
FDLOG(LOG_ERR, fd_cb, "failed to create a close packet: %d", error);
goto done;
}
error = flow_divert_packet_append_tlv(packet, FLOW_DIVERT_TLV_ERROR_CODE, sizeof(zero), &zero);
if (error) {
FDLOG(LOG_ERR, fd_cb, "failed to add the error code TLV: %d", error);
goto done;
}
how = htonl(how);
error = flow_divert_packet_append_tlv(packet, FLOW_DIVERT_TLV_HOW, sizeof(how), &how);
if (error) {
FDLOG(LOG_ERR, fd_cb, "failed to add the how flag: %d", error);
goto done;
}
error = flow_divert_send_packet(fd_cb, packet);
if (error) {
goto done;
}
done:
if (error && packet != NULL) {
mbuf_free(packet);
}
return error;
}
static int
flow_divert_tunnel_how_closed(struct flow_divert_pcb *fd_cb)
{
if ((fd_cb->flags & (FLOW_DIVERT_TUNNEL_RD_CLOSED | FLOW_DIVERT_TUNNEL_WR_CLOSED)) ==
(FLOW_DIVERT_TUNNEL_RD_CLOSED | FLOW_DIVERT_TUNNEL_WR_CLOSED)) {
return SHUT_RDWR;
} else if (fd_cb->flags & FLOW_DIVERT_TUNNEL_RD_CLOSED) {
return SHUT_RD;
} else if (fd_cb->flags & FLOW_DIVERT_TUNNEL_WR_CLOSED) {
return SHUT_WR;
}
return -1;
}
/*
* Determine what close messages if any need to be sent to the tunnel. Returns TRUE if the tunnel is closed for both reads and
* writes. Returns FALSE otherwise.
*/
static void
flow_divert_send_close_if_needed(struct flow_divert_pcb *fd_cb)
{
int how = -1;
/* Do not send any close messages if there is still data in the send buffer */
if (fd_cb->so->so_snd.sb_cc == 0) {
if ((fd_cb->flags & (FLOW_DIVERT_READ_CLOSED | FLOW_DIVERT_TUNNEL_RD_CLOSED)) == FLOW_DIVERT_READ_CLOSED) {
/* Socket closed reads, but tunnel did not. Tell tunnel to close reads */
how = SHUT_RD;
}
if ((fd_cb->flags & (FLOW_DIVERT_WRITE_CLOSED | FLOW_DIVERT_TUNNEL_WR_CLOSED)) == FLOW_DIVERT_WRITE_CLOSED) {
/* Socket closed writes, but tunnel did not. Tell tunnel to close writes */
if (how == SHUT_RD) {
how = SHUT_RDWR;
} else {
how = SHUT_WR;
}
}
}
if (how != -1) {
FDLOG(LOG_INFO, fd_cb, "sending close, how = %d", how);
if (flow_divert_send_close(fd_cb, how) != ENOBUFS) {
/* Successfully sent the close packet. Record the ways in which the tunnel has been closed */
if (how != SHUT_RD) {
fd_cb->flags |= FLOW_DIVERT_TUNNEL_WR_CLOSED;
}
if (how != SHUT_WR) {
fd_cb->flags |= FLOW_DIVERT_TUNNEL_RD_CLOSED;
}
}
}
if (flow_divert_tunnel_how_closed(fd_cb) == SHUT_RDWR) {
flow_divert_disconnect_socket(fd_cb->so, !(fd_cb->flags & FLOW_DIVERT_IMPLICIT_CONNECT), false);
}
}
static errno_t
flow_divert_send_data_packet(struct flow_divert_pcb *fd_cb, mbuf_t data, size_t data_len)
{
mbuf_t packet = NULL;
mbuf_t last = NULL;
int error = 0;
error = flow_divert_packet_init(fd_cb, FLOW_DIVERT_PKT_DATA, &packet);
if (error || packet == NULL) {
FDLOG(LOG_ERR, fd_cb, "flow_divert_packet_init failed: %d", error);
goto done;
}
if (data_len > 0 && data_len <= INT_MAX && data != NULL) {
last = m_last(packet);
mbuf_setnext(last, data);
mbuf_pkthdr_adjustlen(packet, (int)data_len);
} else {
data_len = 0;
}
error = flow_divert_send_packet(fd_cb, packet);
if (error == 0 && data_len > 0) {
fd_cb->bytes_sent += data_len;
flow_divert_add_data_statistics(fd_cb, data_len, TRUE);
}
done:
if (error) {
if (last != NULL) {
mbuf_setnext(last, NULL);
}
if (packet != NULL) {
mbuf_freem(packet);
}
}
return error;
}
static errno_t
flow_divert_send_datagram_packet(struct flow_divert_pcb *fd_cb, mbuf_t data, size_t data_len, struct sockaddr *toaddr, Boolean is_fragment, size_t datagram_size)
{
mbuf_t packet = NULL;
mbuf_t last = NULL;
int error = 0;
error = flow_divert_packet_init(fd_cb, FLOW_DIVERT_PKT_DATA, &packet);
if (error || packet == NULL) {
FDLOG(LOG_ERR, fd_cb, "flow_divert_packet_init failed: %d", error);
goto done;
}
if (toaddr != NULL) {
error = flow_divert_append_target_endpoint_tlv(packet, toaddr);
if (error) {
FDLOG(LOG_ERR, fd_cb, "flow_divert_append_target_endpoint_tlv() failed: %d", error);
goto done;
}
}
if (is_fragment) {
error = flow_divert_packet_append_tlv(packet, FLOW_DIVERT_TLV_IS_FRAGMENT, sizeof(is_fragment), &is_fragment);
if (error) {
FDLOG(LOG_ERR, fd_cb, "flow_divert_packet_append_tlv(FLOW_DIVERT_TLV_IS_FRAGMENT) failed: %d", error);
goto done;
}
}
error = flow_divert_packet_append_tlv(packet, FLOW_DIVERT_TLV_DATAGRAM_SIZE, sizeof(datagram_size), &datagram_size);
if (error) {
FDLOG(LOG_ERR, fd_cb, "flow_divert_packet_append_tlv(FLOW_DIVERT_TLV_DATAGRAM_SIZE) failed: %d", error);
goto done;
}
if (data_len > 0 && data_len <= INT_MAX && data != NULL) {
last = m_last(packet);
mbuf_setnext(last, data);
mbuf_pkthdr_adjustlen(packet, (int)data_len);
} else {
data_len = 0;
}
error = flow_divert_send_packet(fd_cb, packet);
if (error == 0 && data_len > 0) {
fd_cb->bytes_sent += data_len;
flow_divert_add_data_statistics(fd_cb, data_len, TRUE);
}
done:
if (error) {
if (last != NULL) {
mbuf_setnext(last, NULL);
}
if (packet != NULL) {
mbuf_freem(packet);
}
}
return error;
}
static errno_t
flow_divert_send_fragmented_datagram(struct flow_divert_pcb *fd_cb, mbuf_t datagram, size_t datagram_len, struct sockaddr *toaddr)
{
mbuf_t next_data = datagram;
size_t remaining_len = datagram_len;
mbuf_t remaining_data = NULL;
int error = 0;
bool first = true;
while (remaining_len > 0 && next_data != NULL) {
size_t to_send = remaining_len;
remaining_data = NULL;
if (to_send > FLOW_DIVERT_CHUNK_SIZE) {
to_send = FLOW_DIVERT_CHUNK_SIZE;
error = mbuf_split(next_data, to_send, MBUF_DONTWAIT, &remaining_data);
if (error) {
break;
}
}
error = flow_divert_send_datagram_packet(fd_cb, next_data, to_send, (first ? toaddr : NULL), TRUE, (first ? datagram_len : 0));
if (error) {
break;
}
first = false;
remaining_len -= to_send;
next_data = remaining_data;
}
if (error) {
if (next_data != NULL) {
mbuf_freem(next_data);
}
if (remaining_data != NULL) {
mbuf_freem(remaining_data);
}
}
return error;
}
static void
flow_divert_send_buffered_data(struct flow_divert_pcb *fd_cb, Boolean force)
{
size_t to_send;
size_t sent = 0;
int error = 0;
mbuf_t buffer;
to_send = fd_cb->so->so_snd.sb_cc;
buffer = fd_cb->so->so_snd.sb_mb;
if (buffer == NULL && to_send > 0) {
FDLOG(LOG_ERR, fd_cb, "Send buffer is NULL, but size is supposed to be %lu", to_send);
return;
}
/* Ignore the send window if force is enabled */
if (!force && (to_send > fd_cb->send_window)) {
to_send = fd_cb->send_window;
}
if (SOCK_TYPE(fd_cb->so) == SOCK_STREAM) {
while (sent < to_send) {
mbuf_t data;
size_t data_len;
data_len = to_send - sent;
if (data_len > FLOW_DIVERT_CHUNK_SIZE) {
data_len = FLOW_DIVERT_CHUNK_SIZE;
}
error = mbuf_copym(buffer, sent, data_len, MBUF_DONTWAIT, &data);
if (error) {
FDLOG(LOG_ERR, fd_cb, "mbuf_copym failed: %d", error);
break;
}
error = flow_divert_send_data_packet(fd_cb, data, data_len);
if (error) {
if (data != NULL) {
mbuf_freem(data);
}
break;
}
sent += data_len;
}
sbdrop(&fd_cb->so->so_snd, (int)sent);
sowwakeup(fd_cb->so);
} else if (SOCK_TYPE(fd_cb->so) == SOCK_DGRAM) {
mbuf_t data;
mbuf_t m;
size_t data_len;
while (buffer) {
struct sockaddr *toaddr = flow_divert_get_buffered_target_address(buffer);
m = buffer;
if (toaddr != NULL) {
/* look for data in the chain */
do {
m = m->m_next;
if (m != NULL && m->m_type == MT_DATA) {
break;
}
} while (m);
if (m == NULL) {
/* unexpected */
FDLOG0(LOG_ERR, fd_cb, "failed to find type MT_DATA in the mbuf chain.");
goto move_on;
}
}
data_len = mbuf_pkthdr_len(m);
if (data_len > 0) {
FDLOG(LOG_DEBUG, fd_cb, "mbuf_copym() data_len = %lu", data_len);
error = mbuf_copym(m, 0, data_len, MBUF_DONTWAIT, &data);
if (error) {
FDLOG(LOG_ERR, fd_cb, "mbuf_copym failed: %d", error);
break;
}
} else {
data = NULL;
}
if (data_len <= FLOW_DIVERT_CHUNK_SIZE) {
error = flow_divert_send_datagram_packet(fd_cb, data, data_len, toaddr, FALSE, 0);
} else {
error = flow_divert_send_fragmented_datagram(fd_cb, data, data_len, toaddr);
data = NULL;
}
if (error) {
if (data != NULL) {
mbuf_freem(data);
}
break;
}
sent += data_len;
move_on:
buffer = buffer->m_nextpkt;
(void) sbdroprecord(&(fd_cb->so->so_snd));
}
}
if (sent > 0) {
FDLOG(LOG_DEBUG, fd_cb, "sent %lu bytes of buffered data", sent);
if (fd_cb->send_window >= sent) {
fd_cb->send_window -= sent;
} else {
fd_cb->send_window = 0;
}
}
}
static int
flow_divert_send_app_data(struct flow_divert_pcb *fd_cb, mbuf_t data, size_t data_size, struct sockaddr *toaddr)
{
size_t to_send = data_size;
int error = 0;
if (to_send > fd_cb->send_window) {
to_send = fd_cb->send_window;
}
if (fd_cb->so->so_snd.sb_cc > 0) {
to_send = 0; /* If the send buffer is non-empty, then we can't send anything */
}
if (SOCK_TYPE(fd_cb->so) == SOCK_STREAM) {
size_t sent = 0;
mbuf_t remaining_data = data;
size_t remaining_size = data_size;
mbuf_t pkt_data = NULL;
while (sent < to_send && remaining_data != NULL && remaining_size > 0) {
size_t pkt_data_len;
pkt_data = remaining_data;
if ((to_send - sent) > FLOW_DIVERT_CHUNK_SIZE) {
pkt_data_len = FLOW_DIVERT_CHUNK_SIZE;
} else {
pkt_data_len = to_send - sent;
}
if (pkt_data_len < remaining_size) {
error = mbuf_split(pkt_data, pkt_data_len, MBUF_DONTWAIT, &remaining_data);
if (error) {
FDLOG(LOG_ERR, fd_cb, "mbuf_split failed: %d", error);
pkt_data = NULL;
break;
}
remaining_size -= pkt_data_len;
} else {
remaining_data = NULL;
remaining_size = 0;
}
error = flow_divert_send_data_packet(fd_cb, pkt_data, pkt_data_len);
if (error) {
break;
}
pkt_data = NULL;
sent += pkt_data_len;
}
if (fd_cb->send_window >= sent) {
fd_cb->send_window -= sent;
} else {
fd_cb->send_window = 0;
}
error = 0;
if (pkt_data != NULL) {
if (sbspace(&fd_cb->so->so_snd) > 0) {
if (!sbappendstream(&fd_cb->so->so_snd, pkt_data)) {
FDLOG(LOG_ERR, fd_cb, "sbappendstream failed with pkt_data, send buffer size = %u, send_window = %u\n",
fd_cb->so->so_snd.sb_cc, fd_cb->send_window);
}
} else {
mbuf_freem(pkt_data);
error = ENOBUFS;
}
}
if (remaining_data != NULL) {
if (sbspace(&fd_cb->so->so_snd) > 0) {
if (!sbappendstream(&fd_cb->so->so_snd, remaining_data)) {
FDLOG(LOG_ERR, fd_cb, "sbappendstream failed with remaining_data, send buffer size = %u, send_window = %u\n",
fd_cb->so->so_snd.sb_cc, fd_cb->send_window);
}
} else {
mbuf_freem(remaining_data);
error = ENOBUFS;
}
}
} else if (SOCK_TYPE(fd_cb->so) == SOCK_DGRAM) {
int send_dgram_error = 0;
if (to_send || data_size == 0) {
if (data_size <= FLOW_DIVERT_CHUNK_SIZE) {
send_dgram_error = flow_divert_send_datagram_packet(fd_cb, data, data_size, toaddr, FALSE, 0);
} else {
send_dgram_error = flow_divert_send_fragmented_datagram(fd_cb, data, data_size, toaddr);
data = NULL;
}
if (send_dgram_error) {
FDLOG(LOG_NOTICE, fd_cb, "flow_divert_send_datagram_packet failed with error %d, send data size = %lu", send_dgram_error, data_size);
} else {
if (data_size >= fd_cb->send_window) {
fd_cb->send_window = 0;
} else {
fd_cb->send_window -= data_size;
}
data = NULL;
}
}
if (data != NULL) {
/* buffer it */
if (sbspace(&fd_cb->so->so_snd) > 0) {
if (toaddr != NULL) {
int append_error = 0;
if (!sbappendaddr(&fd_cb->so->so_snd, toaddr, data, NULL, &append_error)) {
FDLOG(LOG_ERR, fd_cb,
"sbappendaddr failed. send buffer size = %u, send_window = %u, error = %d",
fd_cb->so->so_snd.sb_cc, fd_cb->send_window, append_error);
}
} else {
if (!sbappendrecord(&fd_cb->so->so_snd, data)) {
FDLOG(LOG_ERR, fd_cb,
"sbappendrecord failed. send buffer size = %u, send_window = %u",
fd_cb->so->so_snd.sb_cc, fd_cb->send_window);
}
}
} else {
FDLOG(LOG_ERR, fd_cb, "flow_divert_send_datagram_packet failed with error %d, send data size = %lu, dropping the datagram", error, data_size);
mbuf_freem(data);
}
}
}
return error;
}
static int
flow_divert_send_read_notification(struct flow_divert_pcb *fd_cb)
{
int error = 0;
mbuf_t packet = NULL;
error = flow_divert_packet_init(fd_cb, FLOW_DIVERT_PKT_READ_NOTIFY, &packet);
if (error) {
FDLOG(LOG_ERR, fd_cb, "failed to create a read notification packet: %d", error);
goto done;
}
error = flow_divert_send_packet(fd_cb, packet);
if (error) {
goto done;
}
done:
if (error && packet != NULL) {
mbuf_free(packet);
}
return error;
}
static int
flow_divert_send_traffic_class_update(struct flow_divert_pcb *fd_cb, int traffic_class)
{
int error = 0;
mbuf_t packet = NULL;
error = flow_divert_packet_init(fd_cb, FLOW_DIVERT_PKT_PROPERTIES_UPDATE, &packet);
if (error) {
FDLOG(LOG_ERR, fd_cb, "failed to create a properties update packet: %d", error);
goto done;
}
error = flow_divert_packet_append_tlv(packet, FLOW_DIVERT_TLV_TRAFFIC_CLASS, sizeof(traffic_class), &traffic_class);
if (error) {
FDLOG(LOG_ERR, fd_cb, "failed to add the traffic class: %d", error);
goto done;
}
error = flow_divert_send_packet(fd_cb, packet);
if (error) {
goto done;
}
done:
if (error && packet != NULL) {
mbuf_free(packet);
}
return error;
}
static void
flow_divert_set_local_endpoint(struct flow_divert_pcb *fd_cb, struct sockaddr *local_endpoint)
{
struct inpcb *inp = sotoinpcb(fd_cb->so);
if (local_endpoint->sa_family == AF_INET6) {
if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && (fd_cb->flags & FLOW_DIVERT_SHOULD_SET_LOCAL_ADDR)) {
fd_cb->flags |= FLOW_DIVERT_DID_SET_LOCAL_ADDR;
inp->in6p_laddr = (satosin6(local_endpoint))->sin6_addr;
inp->inp_lifscope = (satosin6(local_endpoint))->sin6_scope_id;
in6_verify_ifscope(&inp->in6p_laddr, inp->inp_lifscope);
}
if (inp->inp_lport == 0) {
inp->inp_lport = (satosin6(local_endpoint))->sin6_port;
}
} else if (local_endpoint->sa_family == AF_INET) {
if (inp->inp_laddr.s_addr == INADDR_ANY && (fd_cb->flags & FLOW_DIVERT_SHOULD_SET_LOCAL_ADDR)) {
fd_cb->flags |= FLOW_DIVERT_DID_SET_LOCAL_ADDR;
inp->inp_laddr = (satosin(local_endpoint))->sin_addr;
}
if (inp->inp_lport == 0) {
inp->inp_lport = (satosin(local_endpoint))->sin_port;
}
}
}
static void
flow_divert_set_remote_endpoint(struct flow_divert_pcb *fd_cb, struct sockaddr *remote_endpoint)
{
struct inpcb *inp = sotoinpcb(fd_cb->so);
if (remote_endpoint->sa_family == AF_INET6) {
if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
inp->in6p_faddr = (satosin6(remote_endpoint))->sin6_addr;
inp->inp_fifscope = (satosin6(remote_endpoint))->sin6_scope_id;
in6_verify_ifscope(&inp->in6p_faddr, inp->inp_fifscope);
}
if (inp->inp_fport == 0) {
inp->inp_fport = (satosin6(remote_endpoint))->sin6_port;
}
} else if (remote_endpoint->sa_family == AF_INET) {
if (inp->inp_faddr.s_addr == INADDR_ANY) {
inp->inp_faddr = (satosin(remote_endpoint))->sin_addr;
}
if (inp->inp_fport == 0) {
inp->inp_fport = (satosin(remote_endpoint))->sin_port;
}
}
}
static uint32_t
flow_divert_derive_kernel_control_unit(pid_t pid, uint32_t *ctl_unit, uint32_t *aggregate_unit, bool *is_aggregate)
{
uint32_t result = *ctl_unit;
// There are two models supported for deriving control units:
// 1. A series of flow divert units that allow "transparently" failing
// over to the next unit. For this model, the aggregate_unit contains list
// of all control units (between 1 and 30) masked over each other.
// 2. An indication that in-process flow divert should be preferred, with
// an out of process flow divert to fail over to. For this model, the
// ctl_unit is FLOW_DIVERT_IN_PROCESS_UNIT. In this case, that unit
// is returned first, with the unpacked aggregate unit returned as a
// fallback.
*is_aggregate = false;
if (*ctl_unit == FLOW_DIVERT_IN_PROCESS_UNIT) {
bool found_unit = false;
if (pid != 0) {
// Look for an in-process group that is already open, and use that unit
struct flow_divert_group *group = NULL;
TAILQ_FOREACH(group, &g_flow_divert_in_process_group_list, chain) {
if (group->in_process_pid == pid) {
// Found an in-process group for our same PID, use it
found_unit = true;
result = group->ctl_unit;
break;
}
}
// If an in-process group isn't open yet, send a signal up through NECP to request one
if (!found_unit) {
necp_client_request_in_process_flow_divert(pid);
}
}
// If a unit was found, return it
if (found_unit) {
if (aggregate_unit != NULL && *aggregate_unit != 0) {
*is_aggregate = true;
}
// The next time around, the aggregate unit values will be picked up
*ctl_unit = 0;
return result;
}
// If no unit was found, fall through and clear out the ctl_unit
result = 0;
*ctl_unit = 0;
}
if (aggregate_unit != NULL && *aggregate_unit != 0) {
uint32_t counter;
struct flow_divert_group *lower_order_group = NULL;
for (counter = 0; counter < (GROUP_COUNT_MAX - 1); counter++) {
if ((*aggregate_unit) & (1 << counter)) {
struct flow_divert_group *group = NULL;
group = flow_divert_group_lookup(counter + 1, NULL);
if (group != NULL) {
if (lower_order_group == NULL) {
lower_order_group = group;
} else if ((group->order < lower_order_group->order)) {
lower_order_group = group;
}
}
}
}
if (lower_order_group != NULL) {
*aggregate_unit &= ~(1 << (lower_order_group->ctl_unit - 1));
*is_aggregate = true;
return lower_order_group->ctl_unit;
} else {
*ctl_unit = 0;
return result;
}
} else {
*ctl_unit = 0;
return result;
}
}
static int
flow_divert_try_next_group(struct flow_divert_pcb *fd_cb)
{
int error = 0;
uint32_t policy_control_unit = fd_cb->policy_control_unit;
flow_divert_pcb_remove(fd_cb);
do {
struct flow_divert_group *next_group = NULL;
bool is_aggregate = false;
uint32_t next_ctl_unit = flow_divert_derive_kernel_control_unit(0, &policy_control_unit, &(fd_cb->aggregate_unit), &is_aggregate);
if (fd_cb->control_group_unit == next_ctl_unit) {
FDLOG0(LOG_NOTICE, fd_cb, "Next control unit is the same as the current control unit, disabling flow divert");
error = EALREADY;
break;
}
if (next_ctl_unit == 0 || next_ctl_unit >= GROUP_COUNT_MAX) {
FDLOG0(LOG_NOTICE, fd_cb, "No more valid control units, disabling flow divert");
error = ENOENT;
break;
}
next_group = flow_divert_group_lookup(next_ctl_unit, fd_cb);
if (next_group == NULL) {
FDLOG(LOG_NOTICE, fd_cb, "Group for control unit %u does not exist", next_ctl_unit);
continue;
}
FDLOG(LOG_NOTICE, fd_cb, "Moving from %u to %u", fd_cb->control_group_unit, next_ctl_unit);
error = flow_divert_pcb_insert(fd_cb, next_group);
if (error == 0) {
if (is_aggregate) {
fd_cb->flags |= FLOW_DIVERT_FLOW_IS_TRANSPARENT;
} else {
fd_cb->flags &= ~FLOW_DIVERT_FLOW_IS_TRANSPARENT;
}
}
FDGRP_RELEASE(next_group);
} while (fd_cb->group == NULL);
if (fd_cb->group == NULL) {
return error ? error : ENOENT;
}
error = flow_divert_send_connect_packet(fd_cb);
if (error) {
FDLOG(LOG_NOTICE, fd_cb, "Failed to send the connect packet to %u, disabling flow divert", fd_cb->control_group_unit);
flow_divert_pcb_remove(fd_cb);
error = ENOENT;
}
return error;
}
static void
flow_divert_disable(struct flow_divert_pcb *fd_cb)
{
struct socket *so = NULL;
mbuf_t buffer;
int error = 0;
proc_t last_proc = NULL;
struct sockaddr *remote_endpoint = fd_cb->original_remote_endpoint;
bool do_connect = !(fd_cb->flags & FLOW_DIVERT_IMPLICIT_CONNECT);
struct inpcb *inp = NULL;
so = fd_cb->so;
if (so == NULL) {
goto done;
}
FDLOG0(LOG_NOTICE, fd_cb, "Skipped all flow divert services, disabling flow divert");
/* Restore the IP state */
inp = sotoinpcb(so);
inp->inp_vflag = fd_cb->original_vflag;
inp->inp_faddr.s_addr = INADDR_ANY;
inp->inp_fport = 0;
memset(&(inp->in6p_faddr), 0, sizeof(inp->in6p_faddr));
inp->inp_fifscope = IFSCOPE_NONE;
inp->in6p_fport = 0;
/* If flow divert set the local address, clear it out */
if (fd_cb->flags & FLOW_DIVERT_DID_SET_LOCAL_ADDR) {
inp->inp_laddr.s_addr = INADDR_ANY;
memset(&(inp->in6p_laddr), 0, sizeof(inp->in6p_laddr));
inp->inp_lifscope = IFSCOPE_NONE;
}
inp->inp_last_outifp = fd_cb->original_last_outifp;
inp->in6p_last_outifp = fd_cb->original_last_outifp6;
/* Dis-associate the socket */
so->so_flags &= ~SOF_FLOW_DIVERT;
so->so_flags1 |= SOF1_FLOW_DIVERT_SKIP;
so->so_fd_pcb = NULL;
fd_cb->so = NULL;
FDRELEASE(fd_cb); /* Release the socket's reference */
/* Revert back to the original protocol */
so->so_proto = pffindproto(SOCK_DOM(so), SOCK_PROTO(so), SOCK_TYPE(so));
/* Reset the socket state to avoid confusing NECP */
so->so_state &= ~(SS_ISCONNECTING | SS_ISCONNECTED);
last_proc = proc_find(so->last_pid);
if (do_connect) {
/* Connect using the original protocol */
error = (*so->so_proto->pr_usrreqs->pru_connect)(so, remote_endpoint, (last_proc != NULL ? last_proc : current_proc()));
if (error) {
FDLOG(LOG_ERR, fd_cb, "Failed to connect using the socket's original protocol: %d", error);
goto done;
}
}
buffer = so->so_snd.sb_mb;
if (buffer == NULL) {
/* No buffered data, done */
goto done;
}
/* Send any buffered data using the original protocol */
if (SOCK_TYPE(so) == SOCK_STREAM) {
mbuf_t data_to_send = NULL;
size_t data_len = so->so_snd.sb_cc;
error = mbuf_copym(buffer, 0, data_len, MBUF_DONTWAIT, &data_to_send);
if (error) {
FDLOG0(LOG_ERR, fd_cb, "Failed to copy the mbuf chain in the socket's send buffer");
goto done;
}
sbflush(&so->so_snd);
if (data_to_send->m_flags & M_PKTHDR) {
mbuf_pkthdr_setlen(data_to_send, data_len);
}
error = (*so->so_proto->pr_usrreqs->pru_send)(so,
0,
data_to_send,
NULL,
NULL,
(last_proc != NULL ? last_proc : current_proc()));
if (error && error != EWOULDBLOCK) {
FDLOG(LOG_ERR, fd_cb, "Failed to send queued TCP data using the socket's original protocol: %d", error);
} else {
error = 0;
}
} else if (SOCK_TYPE(so) == SOCK_DGRAM) {
struct sockbuf *sb = &so->so_snd;
MBUFQ_HEAD(send_queue_head) send_queue;
MBUFQ_INIT(&send_queue);
/* Flush the send buffer, moving all records to a temporary queue */
while (sb->sb_mb != NULL) {
mbuf_t record = sb->sb_mb;
mbuf_t m = record;
sb->sb_mb = sb->sb_mb->m_nextpkt;
while (m != NULL) {
sbfree(sb, m);
m = m->m_next;
}
record->m_nextpkt = NULL;
MBUFQ_ENQUEUE(&send_queue, record);
}
SB_EMPTY_FIXUP(sb);
while (!MBUFQ_EMPTY(&send_queue)) {
mbuf_t next_record = MBUFQ_FIRST(&send_queue);
mbuf_t addr = NULL;
mbuf_t control = NULL;
mbuf_t last_control = NULL;
mbuf_t data = NULL;
mbuf_t m = next_record;
struct sockaddr *to_endpoint = NULL;
MBUFQ_DEQUEUE(&send_queue, next_record);
while (m != NULL) {
if (m->m_type == MT_SONAME) {
addr = m;
} else if (m->m_type == MT_CONTROL) {
if (control == NULL) {
control = m;
}
last_control = m;
} else if (m->m_type == MT_DATA) {
data = m;
break;
}
m = m->m_next;
}
if (addr != NULL && !do_connect) {
to_endpoint = flow_divert_get_buffered_target_address(addr);
if (to_endpoint == NULL) {
FDLOG0(LOG_NOTICE, fd_cb, "Failed to get the remote address from the buffer");
}
}
if (data == NULL) {
FDLOG0(LOG_ERR, fd_cb, "Buffered record does not contain any data");
mbuf_freem(next_record);
continue;
}
if (!(data->m_flags & M_PKTHDR)) {
FDLOG0(LOG_ERR, fd_cb, "Buffered data does not have a packet header");
mbuf_freem(next_record);
continue;
}
if (addr != NULL) {
addr->m_next = NULL;
}
if (last_control != NULL) {
last_control->m_next = NULL;
}
error = (*so->so_proto->pr_usrreqs->pru_send)(so,
0,
data,
to_endpoint,
control,
(last_proc != NULL ? last_proc : current_proc()));
if (addr != NULL) {
mbuf_freem(addr);
}
if (error) {
FDLOG(LOG_ERR, fd_cb, "Failed to send queued UDP data using the socket's original protocol: %d", error);
}
}
}
done:
if (last_proc != NULL) {
proc_rele(last_proc);
}
if (error && so != NULL) {
so->so_error = (uint16_t)error;
flow_divert_disconnect_socket(so, do_connect, false);
}
}
static void
flow_divert_scope(struct flow_divert_pcb *fd_cb, int out_if_index, bool derive_new_address)
{
struct socket *so = NULL;
struct inpcb *inp = NULL;
struct ifnet *current_ifp = NULL;
struct ifnet *new_ifp = NULL;
int error = 0;
so = fd_cb->so;
if (so == NULL) {
return;
}
inp = sotoinpcb(so);
if (out_if_index <= 0) {
return;
}
if (inp->inp_vflag & INP_IPV6) {
current_ifp = inp->in6p_last_outifp;
} else {
current_ifp = inp->inp_last_outifp;
}
if (current_ifp != NULL) {
if (current_ifp->if_index == out_if_index) {
/* No change */
return;
}
/* Scope the socket to the given interface */
error = inp_bindif(inp, out_if_index, &new_ifp);
if (error != 0) {
FDLOG(LOG_ERR, fd_cb, "failed to scope to %d because inp_bindif returned %d", out_if_index, error);
return;
}
if (derive_new_address && fd_cb->original_remote_endpoint != NULL) {
/* Get the appropriate address for the given interface */
if (inp->inp_vflag & INP_IPV6) {
inp->in6p_laddr = sa6_any.sin6_addr;
error = in6_pcbladdr(inp, fd_cb->original_remote_endpoint, &(fd_cb->local_endpoint.sin6.sin6_addr), NULL);
} else {
inp->inp_laddr.s_addr = INADDR_ANY;
error = in_pcbladdr(inp, fd_cb->original_remote_endpoint, &(fd_cb->local_endpoint.sin.sin_addr), IFSCOPE_NONE, NULL, 0);
}
if (error != 0) {
FDLOG(LOG_WARNING, fd_cb, "failed to derive a new local address from %d because in_pcbladdr returned %d", out_if_index, error);
}
}
} else {
ifnet_head_lock_shared();
if (IF_INDEX_IN_RANGE(out_if_index)) {
new_ifp = ifindex2ifnet[out_if_index];
}
ifnet_head_done();
}
/* Update the "last interface" of the socket */
if (new_ifp != NULL) {
if (inp->inp_vflag & INP_IPV6) {
inp->in6p_last_outifp = new_ifp;
} else {
inp->inp_last_outifp = new_ifp;
}
#if SKYWALK
if (NETNS_TOKEN_VALID(&inp->inp_netns_token)) {
netns_set_ifnet(&inp->inp_netns_token, new_ifp);
}
#endif /* SKYWALK */
}
}
static void
flow_divert_handle_connect_result(struct flow_divert_pcb *fd_cb, mbuf_t packet, int offset)
{
uint32_t connect_error = 0;
uint32_t ctl_unit = 0;
int error = 0;
union sockaddr_in_4_6 local_endpoint = {};
union sockaddr_in_4_6 remote_endpoint = {};
int out_if_index = 0;
uint32_t send_window;
uint32_t app_data_length = 0;
memset(&local_endpoint, 0, sizeof(local_endpoint));
memset(&remote_endpoint, 0, sizeof(remote_endpoint));
error = flow_divert_packet_get_tlv(packet, offset, FLOW_DIVERT_TLV_ERROR_CODE, sizeof(connect_error), &connect_error, NULL);
if (error) {
FDLOG(LOG_ERR, fd_cb, "failed to get the connect result: %d", error);
return;
}
connect_error = ntohl(connect_error);
FDLOG(LOG_INFO, fd_cb, "received connect result %u", connect_error);
error = flow_divert_packet_get_tlv(packet, offset, FLOW_DIVERT_TLV_SPACE_AVAILABLE, sizeof(send_window), &send_window, NULL);
if (error) {
FDLOG(LOG_ERR, fd_cb, "failed to get the send window: %d", error);
return;
}
error = flow_divert_packet_get_tlv(packet, offset, FLOW_DIVERT_TLV_CTL_UNIT, sizeof(ctl_unit), &ctl_unit, NULL);
if (error) {
FDLOG0(LOG_INFO, fd_cb, "No control unit provided in the connect result");
}
error = flow_divert_packet_get_tlv(packet, offset, FLOW_DIVERT_TLV_LOCAL_ADDR, sizeof(local_endpoint), &(local_endpoint.sa), NULL);
if (error) {
FDLOG0(LOG_INFO, fd_cb, "No local address provided");
}
error = flow_divert_packet_get_tlv(packet, offset, FLOW_DIVERT_TLV_REMOTE_ADDR, sizeof(remote_endpoint), &(remote_endpoint.sa), NULL);
if (error) {
FDLOG0(LOG_INFO, fd_cb, "No remote address provided");
}
error = flow_divert_packet_get_tlv(packet, offset, FLOW_DIVERT_TLV_OUT_IF_INDEX, sizeof(out_if_index), &out_if_index, NULL);
if (error) {
FDLOG0(LOG_INFO, fd_cb, "No output if index provided");
}
error = flow_divert_packet_get_tlv(packet, offset, FLOW_DIVERT_TLV_APP_DATA, 0, NULL, &app_data_length);
if (error) {
FDLOG0(LOG_INFO, fd_cb, "No application data provided in connect result");
}
error = 0;
FDLOCK(fd_cb);
if (fd_cb->so != NULL) {
struct inpcb *inp = NULL;
struct socket *so = fd_cb->so;
bool local_address_is_valid = false;
socket_lock(so, 1);
if (!(so->so_flags & SOF_FLOW_DIVERT)) {
FDLOG0(LOG_NOTICE, fd_cb, "socket is not attached any more, ignoring connect result");
goto done;
}
if (SOCK_TYPE(so) == SOCK_STREAM && !(so->so_state & SS_ISCONNECTING)) {
FDLOG0(LOG_ERR, fd_cb, "TCP socket is not in the connecting state, ignoring connect result");
goto done;
}
inp = sotoinpcb(so);
if (connect_error || error) {
goto set_socket_state;
}
if (flow_divert_is_sockaddr_valid(SA(&local_endpoint))) {
if (local_endpoint.sa.sa_family == AF_INET) {
local_endpoint.sa.sa_len = sizeof(struct sockaddr_in);
if ((inp->inp_vflag & INP_IPV4) && local_endpoint.sin.sin_addr.s_addr != INADDR_ANY) {
local_address_is_valid = true;
fd_cb->local_endpoint = local_endpoint;
inp->inp_laddr.s_addr = INADDR_ANY;
} else {
fd_cb->local_endpoint.sin.sin_port = local_endpoint.sin.sin_port;
}
} else if (local_endpoint.sa.sa_family == AF_INET6) {
local_endpoint.sa.sa_len = sizeof(struct sockaddr_in6);
if ((inp->inp_vflag & INP_IPV6) && !IN6_IS_ADDR_UNSPECIFIED(&local_endpoint.sin6.sin6_addr)) {
local_address_is_valid = true;
fd_cb->local_endpoint = local_endpoint;
inp->in6p_laddr = sa6_any.sin6_addr;
} else {
fd_cb->local_endpoint.sin6.sin6_port = local_endpoint.sin6.sin6_port;
}
}
}
flow_divert_scope(fd_cb, out_if_index, !local_address_is_valid);
flow_divert_set_local_endpoint(fd_cb, SA(&fd_cb->local_endpoint));
if (flow_divert_is_sockaddr_valid(SA(&remote_endpoint)) && SOCK_TYPE(so) == SOCK_STREAM) {
if (remote_endpoint.sa.sa_family == AF_INET) {
remote_endpoint.sa.sa_len = sizeof(struct sockaddr_in);
} else if (remote_endpoint.sa.sa_family == AF_INET6) {
remote_endpoint.sa.sa_len = sizeof(struct sockaddr_in6);
}
flow_divert_set_remote_endpoint(fd_cb, SA(&remote_endpoint));
}
if (app_data_length > 0) {
uint8_t *app_data = NULL;
app_data = kalloc_data(app_data_length, Z_WAITOK);
if (app_data != NULL) {
error = flow_divert_packet_get_tlv(packet, offset, FLOW_DIVERT_TLV_APP_DATA, app_data_length, app_data, NULL);
if (error == 0) {
FDLOG(LOG_INFO, fd_cb, "Got %u bytes of app data from the connect result", app_data_length);
if (fd_cb->app_data != NULL) {
kfree_data(fd_cb->app_data, fd_cb->app_data_length);
}
fd_cb->app_data = app_data;
fd_cb->app_data_length = app_data_length;
} else {
FDLOG(LOG_ERR, fd_cb, "Failed to copy %u bytes of application data from the connect result packet", app_data_length);
kfree_data(app_data, app_data_length);
}
} else {
FDLOG(LOG_ERR, fd_cb, "Failed to allocate a buffer of size %u to hold the application data from the connect result", app_data_length);
}
}
if (error) {
goto set_socket_state;
}
if (fd_cb->group == NULL) {
error = EINVAL;
goto set_socket_state;
}
ctl_unit = ntohl(ctl_unit);
if (ctl_unit > 0) {
int insert_error = 0;
struct flow_divert_group *grp = NULL;
if (ctl_unit >= GROUP_COUNT_MAX) {
FDLOG(LOG_ERR, fd_cb, "Connect result contains an invalid control unit: %u", ctl_unit);
error = EINVAL;
goto set_socket_state;
}
grp = flow_divert_group_lookup(ctl_unit, fd_cb);
if (grp == NULL) {
error = ECONNRESET;
goto set_socket_state;
}
flow_divert_pcb_remove(fd_cb);
insert_error = flow_divert_pcb_insert(fd_cb, grp);
FDGRP_RELEASE(grp);
if (insert_error != 0) {
error = ECONNRESET;
goto set_socket_state;
}
}
fd_cb->send_window = ntohl(send_window);
set_socket_state:
if (!connect_error && !error) {
FDLOG0(LOG_INFO, fd_cb, "sending connect result");
error = flow_divert_send_connect_result(fd_cb);
}
if (connect_error || error) {
if (connect_error && fd_cb->control_group_unit != fd_cb->policy_control_unit) {
error = flow_divert_try_next_group(fd_cb);
if (error && fd_cb->policy_control_unit == 0) {
flow_divert_disable(fd_cb);
goto done;
} else if (error == 0) {
goto done;
}
}
if (!connect_error) {
flow_divert_update_closed_state(fd_cb, SHUT_RDWR, false, true);
so->so_error = (uint16_t)error;
flow_divert_send_close_if_needed(fd_cb);
} else {
flow_divert_update_closed_state(fd_cb, SHUT_RDWR, true, true);
so->so_error = (uint16_t)connect_error;
}
flow_divert_disconnect_socket(so, !(fd_cb->flags & FLOW_DIVERT_IMPLICIT_CONNECT), false);
} else {
#if NECP
/* Update NECP client with connected five-tuple */
if (!uuid_is_null(inp->necp_client_uuid)) {
socket_unlock(so, 0);
necp_client_assign_from_socket(so->last_pid, inp->necp_client_uuid, inp);
socket_lock(so, 0);
if (!(so->so_flags & SOF_FLOW_DIVERT)) {
/* The socket was closed while it was unlocked */
goto done;
}
}
#endif /* NECP */
flow_divert_send_buffered_data(fd_cb, FALSE);
soisconnected(so);
}
/* We don't need the connect packet any more */
if (fd_cb->connect_packet != NULL) {
mbuf_freem(fd_cb->connect_packet);
fd_cb->connect_packet = NULL;
}
/* We don't need the original remote endpoint any more */
free_sockaddr(fd_cb->original_remote_endpoint);
done:
socket_unlock(so, 1);
}
FDUNLOCK(fd_cb);
}
static void
flow_divert_handle_close(struct flow_divert_pcb *fd_cb, mbuf_t packet, int offset)
{
uint32_t close_error = 0;
int error = 0;
int how = 0;
error = flow_divert_packet_get_tlv(packet, offset, FLOW_DIVERT_TLV_ERROR_CODE, sizeof(close_error), &close_error, NULL);
if (error) {
FDLOG(LOG_ERR, fd_cb, "failed to get the close error: %d", error);
return;
}
error = flow_divert_packet_get_tlv(packet, offset, FLOW_DIVERT_TLV_HOW, sizeof(how), &how, NULL);
if (error) {
FDLOG(LOG_ERR, fd_cb, "failed to get the close how flag: %d", error);
return;
}
how = ntohl(how);
FDLOG(LOG_INFO, fd_cb, "close received, how = %d", how);
FDLOCK(fd_cb);
if (fd_cb->so != NULL) {
bool is_connected = (SOCK_TYPE(fd_cb->so) == SOCK_STREAM || !(fd_cb->flags & FLOW_DIVERT_IMPLICIT_CONNECT));
socket_lock(fd_cb->so, 0);
if (!(fd_cb->so->so_flags & SOF_FLOW_DIVERT)) {
FDLOG0(LOG_NOTICE, fd_cb, "socket is not attached any more, ignoring close from provider");
goto done;
}
fd_cb->so->so_error = (uint16_t)ntohl(close_error);
flow_divert_update_closed_state(fd_cb, how, true, true);
/* Only do this for stream flows because "shutdown by peer" doesn't make sense for datagram flows */
how = flow_divert_tunnel_how_closed(fd_cb);
if (how == SHUT_RDWR) {
flow_divert_disconnect_socket(fd_cb->so, is_connected, true);
} else if (how == SHUT_RD && is_connected) {
socantrcvmore(fd_cb->so);
} else if (how == SHUT_WR && is_connected) {
socantsendmore(fd_cb->so);
}
done:
socket_unlock(fd_cb->so, 0);
}
FDUNLOCK(fd_cb);
}
static mbuf_t
flow_divert_create_control_mbuf(struct flow_divert_pcb *fd_cb)
{
struct inpcb *inp = sotoinpcb(fd_cb->so);
bool need_recvdstaddr = false;
/* Socket flow tracking needs to see the local address */
need_recvdstaddr = SOFLOW_ENABLED(inp->inp_socket);
if ((inp->inp_vflag & INP_IPV4) &&
fd_cb->local_endpoint.sa.sa_family == AF_INET &&
((inp->inp_flags & INP_RECVDSTADDR) || need_recvdstaddr)) {
return sbcreatecontrol((caddr_t)&(fd_cb->local_endpoint.sin.sin_addr), sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
} else if ((inp->inp_vflag & INP_IPV6) &&
fd_cb->local_endpoint.sa.sa_family == AF_INET6 &&
((inp->inp_flags & IN6P_PKTINFO) || need_recvdstaddr)) {
struct in6_pktinfo pi6;
memset(&pi6, 0, sizeof(pi6));
pi6.ipi6_addr = fd_cb->local_endpoint.sin6.sin6_addr;
return sbcreatecontrol((caddr_t)&pi6, sizeof(pi6), IPV6_PKTINFO, IPPROTO_IPV6);
}
return NULL;
}
static int
flow_divert_handle_data(struct flow_divert_pcb *fd_cb, mbuf_t packet, size_t offset)
{
int error = 0;
FDLOCK(fd_cb);
if (fd_cb->so != NULL) {
mbuf_t data = NULL;
size_t data_size;
struct sockaddr_storage remote_address;
boolean_t got_remote_sa = FALSE;
boolean_t appended = FALSE;
boolean_t append_success = FALSE;
socket_lock(fd_cb->so, 0);
if (!(fd_cb->so->so_flags & SOF_FLOW_DIVERT)) {
FDLOG0(LOG_NOTICE, fd_cb, "socket is not attached any more, ignoring inbound data");
goto done;
}
if (sbspace(&fd_cb->so->so_rcv) == 0) {
error = ENOBUFS;
fd_cb->flags |= FLOW_DIVERT_NOTIFY_ON_RECEIVED;
FDLOG0(LOG_INFO, fd_cb, "Receive buffer is full, will send read notification when app reads some data");
goto done;
}
if (SOCK_TYPE(fd_cb->so) == SOCK_DGRAM) {
uint32_t val_size = 0;
/* check if we got remote address with data */
memset(&remote_address, 0, sizeof(remote_address));
error = flow_divert_packet_get_tlv(packet, (int)offset, FLOW_DIVERT_TLV_REMOTE_ADDR, sizeof(remote_address), &remote_address, &val_size);
if (error || val_size > sizeof(remote_address)) {
FDLOG0(LOG_INFO, fd_cb, "No remote address provided");
error = 0;
} else {
if (remote_address.ss_len > sizeof(remote_address)) {
remote_address.ss_len = sizeof(remote_address);
}
/* validate the address */
if (flow_divert_is_sockaddr_valid((struct sockaddr *)&remote_address)) {
got_remote_sa = TRUE;
} else {
FDLOG0(LOG_INFO, fd_cb, "Remote address is invalid");
}
offset += (sizeof(uint8_t) + sizeof(uint32_t) + val_size);
}
}
data_size = (mbuf_pkthdr_len(packet) - offset);
if (fd_cb->so->so_state & SS_CANTRCVMORE) {
FDLOG(LOG_NOTICE, fd_cb, "app cannot receive any more data, dropping %lu bytes of data", data_size);
goto done;
}
if (SOCK_TYPE(fd_cb->so) != SOCK_STREAM && SOCK_TYPE(fd_cb->so) != SOCK_DGRAM) {
FDLOG(LOG_ERR, fd_cb, "socket has an unsupported type: %d", SOCK_TYPE(fd_cb->so));
goto done;
}
FDLOG(LOG_DEBUG, fd_cb, "received %lu bytes of data", data_size);
error = mbuf_split(packet, offset, MBUF_DONTWAIT, &data);
if (error || data == NULL) {
FDLOG(LOG_ERR, fd_cb, "mbuf_split failed: %d", error);
goto done;
}
if (SOCK_TYPE(fd_cb->so) == SOCK_STREAM) {
appended = (sbappendstream(&fd_cb->so->so_rcv, data) != 0);
append_success = TRUE;
} else {
struct sockaddr *append_sa = NULL;
mbuf_t mctl;
if (got_remote_sa == TRUE) {
error = flow_divert_dup_addr(remote_address.ss_family, (struct sockaddr *)&remote_address, &append_sa);
} else {
if (SOCK_CHECK_DOM(fd_cb->so, AF_INET6)) {
error = in6_mapped_peeraddr(fd_cb->so, &append_sa);
} else {
error = in_getpeeraddr(fd_cb->so, &append_sa);
}
}
if (error) {
FDLOG0(LOG_ERR, fd_cb, "failed to dup the socket address.");
}
mctl = flow_divert_create_control_mbuf(fd_cb);
int append_error = 0;
appended = sbappendaddr(&fd_cb->so->so_rcv, append_sa, data, mctl, &append_error);
if (appended || append_error == 0) {
append_success = TRUE;
} else {
FDLOG(LOG_ERR, fd_cb, "failed to append %lu bytes of data: %d", data_size, append_error);
}
free_sockaddr(append_sa);
}
if (append_success) {
fd_cb->bytes_received += data_size;
flow_divert_add_data_statistics(fd_cb, data_size, FALSE);
}
if (appended) {
sorwakeup(fd_cb->so);
}
done:
socket_unlock(fd_cb->so, 0);
}
FDUNLOCK(fd_cb);
return error;
}
static void
flow_divert_handle_read_notification(struct flow_divert_pcb *fd_cb, mbuf_t packet, int offset)
{
uint32_t read_count = 0;
int error = 0;
error = flow_divert_packet_get_tlv(packet, offset, FLOW_DIVERT_TLV_READ_COUNT, sizeof(read_count), &read_count, NULL);
if (error) {
FDLOG(LOG_ERR, fd_cb, "failed to get the read count: %d", error);
return;
}
FDLOG(LOG_DEBUG, fd_cb, "received a read notification for %u bytes", ntohl(read_count));
FDLOCK(fd_cb);
if (fd_cb->so != NULL) {
socket_lock(fd_cb->so, 0);
if (!(fd_cb->so->so_flags & SOF_FLOW_DIVERT)) {
FDLOG0(LOG_NOTICE, fd_cb, "socket is not attached any more, ignoring read notification");
goto done;
}
fd_cb->send_window += ntohl(read_count);
flow_divert_send_buffered_data(fd_cb, FALSE);
done:
socket_unlock(fd_cb->so, 0);
}
FDUNLOCK(fd_cb);
}
static void
flow_divert_handle_group_init(struct flow_divert_group *group, mbuf_t packet, int offset)
{
int error = 0;
uint32_t key_size = 0;
int log_level = 0;
uint32_t flags = 0;
int32_t order = FLOW_DIVERT_ORDER_LAST;
error = flow_divert_packet_get_tlv(packet, offset, FLOW_DIVERT_TLV_TOKEN_KEY, 0, NULL, &key_size);
if (error) {
FDLOG(LOG_ERR, &nil_pcb, "failed to get the key size: %d", error);
return;
}
if (key_size == 0 || key_size > FLOW_DIVERT_MAX_KEY_SIZE) {
FDLOG(LOG_ERR, &nil_pcb, "Invalid key size: %u", key_size);
return;
}
error = flow_divert_packet_get_tlv(packet, offset, FLOW_DIVERT_TLV_LOG_LEVEL, sizeof(log_level), &log_level, NULL);
if (!error) {
nil_pcb.log_level = (uint8_t)log_level;
}
lck_rw_lock_exclusive(&group->lck);
if (group->flags & FLOW_DIVERT_GROUP_FLAG_DEFUNCT) {
FDLOG(LOG_ERR, &nil_pcb, "Skipping (re)initialization of defunct group %u", group->ctl_unit);
lck_rw_done(&group->lck);
return;
}
if (group->token_key != NULL) {
kfree_data(group->token_key, group->token_key_size);
group->token_key = NULL;
}
group->token_key = kalloc_data(key_size, Z_WAITOK);
error = flow_divert_packet_get_tlv(packet, offset, FLOW_DIVERT_TLV_TOKEN_KEY, key_size, group->token_key, NULL);
if (error) {
FDLOG(LOG_ERR, &nil_pcb, "failed to get the token key: %d", error);
kfree_data(group->token_key, key_size);
group->token_key = NULL;
lck_rw_done(&group->lck);
return;
}
group->token_key_size = key_size;
error = flow_divert_packet_get_tlv(packet, offset, FLOW_DIVERT_TLV_FLAGS, sizeof(flags), &flags, NULL);
if (!error) {
group->flags = flags;
}
error = flow_divert_packet_get_tlv(packet, offset, FLOW_DIVERT_TLV_ORDER, sizeof(order), &order, NULL);
if (!error) {
FDLOG(LOG_INFO, &nil_pcb, "group %u order is %u", group->ctl_unit, order);
group->order = order;
}
lck_rw_done(&group->lck);
}
static void
flow_divert_handle_properties_update(struct flow_divert_pcb *fd_cb, mbuf_t packet, int offset)
{
int error = 0;
int out_if_index = 0;
uint32_t app_data_length = 0;
FDLOG0(LOG_INFO, fd_cb, "received a properties update");
error = flow_divert_packet_get_tlv(packet, offset, FLOW_DIVERT_TLV_OUT_IF_INDEX, sizeof(out_if_index), &out_if_index, NULL);
if (error) {
FDLOG0(LOG_INFO, fd_cb, "No output if index provided in properties update");
}
error = flow_divert_packet_get_tlv(packet, offset, FLOW_DIVERT_TLV_APP_DATA, 0, NULL, &app_data_length);
if (error) {
FDLOG0(LOG_INFO, fd_cb, "No application data provided in properties update");
}
FDLOCK(fd_cb);
if (fd_cb->so != NULL) {
socket_lock(fd_cb->so, 0);
if (!(fd_cb->so->so_flags & SOF_FLOW_DIVERT)) {
FDLOG0(LOG_NOTICE, fd_cb, "socket is not attached any more, ignoring properties update");
goto done;
}
if (out_if_index > 0) {
flow_divert_scope(fd_cb, out_if_index, true);
flow_divert_set_local_endpoint(fd_cb, SA(&fd_cb->local_endpoint));
}
if (app_data_length > 0) {
uint8_t *app_data = NULL;
app_data = kalloc_data(app_data_length, Z_WAITOK);
if (app_data != NULL) {
error = flow_divert_packet_get_tlv(packet, offset, FLOW_DIVERT_TLV_APP_DATA, app_data_length, app_data, NULL);
if (error == 0) {
if (fd_cb->app_data != NULL) {
kfree_data(fd_cb->app_data, fd_cb->app_data_length);
}
fd_cb->app_data = app_data;
fd_cb->app_data_length = app_data_length;
} else {
FDLOG(LOG_ERR, fd_cb, "Failed to copy %u bytes of application data from the properties update packet", app_data_length);
kfree_data(app_data, app_data_length);
}
} else {
FDLOG(LOG_ERR, fd_cb, "Failed to allocate a buffer of size %u to hold the application data from the properties update", app_data_length);
}
}
done:
socket_unlock(fd_cb->so, 0);
}
FDUNLOCK(fd_cb);
}
static void
flow_divert_handle_app_map_create(struct flow_divert_group *group, mbuf_t packet, int offset)
{
size_t bytes_mem_size;
size_t child_maps_mem_size;
size_t nodes_mem_size;
size_t trie_memory_size = 0;
int cursor;
int error = 0;
struct flow_divert_trie new_trie;
int insert_error = 0;
int prefix_count = -1;
int signing_id_count = 0;
size_t bytes_count = 0;
size_t nodes_count = 0;
size_t maps_count = 0;
lck_rw_lock_exclusive(&group->lck);
/* Re-set the current trie */
if (group->signing_id_trie.memory != NULL) {
kfree_data_addr(group->signing_id_trie.memory);
}
memset(&group->signing_id_trie, 0, sizeof(group->signing_id_trie));
group->signing_id_trie.root = NULL_TRIE_IDX;
memset(&new_trie, 0, sizeof(new_trie));
/* Get the number of shared prefixes in the new set of signing ID strings */
error = flow_divert_packet_get_tlv(packet, offset, FLOW_DIVERT_TLV_PREFIX_COUNT, sizeof(prefix_count), &prefix_count, NULL);
if (prefix_count < 0 || error) {
FDLOG(LOG_ERR, &nil_pcb, "Invalid prefix count (%d) or an error occurred while reading the prefix count: %d", prefix_count, error);
lck_rw_done(&group->lck);
return;
}
/* Compute the number of signing IDs and the total amount of bytes needed to store them */
for (cursor = flow_divert_packet_find_tlv(packet, offset, FLOW_DIVERT_TLV_SIGNING_ID, &error, 0);
cursor >= 0;
cursor = flow_divert_packet_find_tlv(packet, cursor, FLOW_DIVERT_TLV_SIGNING_ID, &error, 1)) {
uint32_t sid_size = 0;
error = flow_divert_packet_get_tlv(packet, cursor, FLOW_DIVERT_TLV_SIGNING_ID, 0, NULL, &sid_size);
if (error || sid_size == 0) {
FDLOG(LOG_ERR, &nil_pcb, "Failed to get the length of the signing identifier at offset %d: %d", cursor, error);
signing_id_count = 0;
break;
}
if (os_add_overflow(bytes_count, sid_size, &bytes_count)) {
FDLOG0(LOG_ERR, &nil_pcb, "Overflow while incrementing number of bytes");
signing_id_count = 0;
break;
}
signing_id_count++;
}
if (signing_id_count == 0) {
lck_rw_done(&group->lck);
FDLOG0(LOG_NOTICE, &nil_pcb, "No signing identifiers");
return;
}
if (os_add3_overflow(prefix_count, signing_id_count, 1, &nodes_count)) { /* + 1 for the root node */
lck_rw_done(&group->lck);
FDLOG0(LOG_ERR, &nil_pcb, "Overflow while computing the number of nodes");
return;
}
if (os_add_overflow(prefix_count, 1, &maps_count)) { /* + 1 for the root node */
lck_rw_done(&group->lck);
FDLOG0(LOG_ERR, &nil_pcb, "Overflow while computing the number of maps");
return;
}
if (bytes_count > UINT16_MAX || nodes_count > UINT16_MAX || maps_count > UINT16_MAX) {
lck_rw_done(&group->lck);
FDLOG(LOG_NOTICE, &nil_pcb, "Invalid bytes count (%lu), nodes count (%lu) or maps count (%lu)", bytes_count, nodes_count, maps_count);
return;
}
FDLOG(LOG_INFO, &nil_pcb, "Nodes count = %lu, child maps count = %lu, bytes_count = %lu",
nodes_count, maps_count, bytes_count);
if (os_mul_overflow(sizeof(*new_trie.nodes), (size_t)nodes_count, &nodes_mem_size) ||
os_mul3_overflow(sizeof(*new_trie.child_maps), CHILD_MAP_SIZE, (size_t)maps_count, &child_maps_mem_size) ||
os_mul_overflow(sizeof(*new_trie.bytes), (size_t)bytes_count, &bytes_mem_size) ||
os_add3_overflow(nodes_mem_size, child_maps_mem_size, bytes_mem_size, &trie_memory_size)) {
FDLOG0(LOG_ERR, &nil_pcb, "Overflow while computing trie memory sizes");
lck_rw_done(&group->lck);
return;
}
if (trie_memory_size > FLOW_DIVERT_MAX_TRIE_MEMORY) {
FDLOG(LOG_ERR, &nil_pcb, "Trie memory size (%lu) is too big (maximum is %u)", trie_memory_size, FLOW_DIVERT_MAX_TRIE_MEMORY);
lck_rw_done(&group->lck);
return;
}
new_trie.memory = kalloc_data(trie_memory_size, Z_WAITOK);
if (new_trie.memory == NULL) {
FDLOG(LOG_ERR, &nil_pcb, "Failed to allocate %lu bytes of memory for the signing ID trie",
nodes_mem_size + child_maps_mem_size + bytes_mem_size);
lck_rw_done(&group->lck);
return;
}
new_trie.bytes_count = (uint16_t)bytes_count;
new_trie.nodes_count = (uint16_t)nodes_count;
new_trie.child_maps_count = (uint16_t)maps_count;
/* Initialize the free lists */
new_trie.nodes = (struct flow_divert_trie_node *)new_trie.memory;
new_trie.nodes_free_next = 0;
memset(new_trie.nodes, 0, nodes_mem_size);
new_trie.child_maps = (uint16_t *)(void *)((uint8_t *)new_trie.memory + nodes_mem_size);
new_trie.child_maps_free_next = 0;
memset(new_trie.child_maps, 0xff, child_maps_mem_size);
new_trie.bytes = (uint8_t *)(void *)((uint8_t *)new_trie.memory + nodes_mem_size + child_maps_mem_size);
new_trie.bytes_free_next = 0;
memset(new_trie.bytes, 0, bytes_mem_size);
/* The root is an empty node */
new_trie.root = trie_node_alloc(&new_trie);
/* Add each signing ID to the trie */
for (cursor = flow_divert_packet_find_tlv(packet, offset, FLOW_DIVERT_TLV_SIGNING_ID, &error, 0);
cursor >= 0;
cursor = flow_divert_packet_find_tlv(packet, cursor, FLOW_DIVERT_TLV_SIGNING_ID, &error, 1)) {
uint32_t sid_size = 0;
error = flow_divert_packet_get_tlv(packet, cursor, FLOW_DIVERT_TLV_SIGNING_ID, 0, NULL, &sid_size);
if (error || sid_size == 0) {
FDLOG(LOG_ERR, &nil_pcb, "Failed to get the length of the signing identifier at offset %d while building: %d", cursor, error);
insert_error = EINVAL;
break;
}
if (sid_size <= UINT16_MAX && new_trie.bytes_free_next + (uint16_t)sid_size <= new_trie.bytes_count) {
uint16_t new_node_idx;
error = flow_divert_packet_get_tlv(packet, cursor, FLOW_DIVERT_TLV_SIGNING_ID, sid_size, &TRIE_BYTE(&new_trie, new_trie.bytes_free_next), NULL);
if (error) {
FDLOG(LOG_ERR, &nil_pcb, "Failed to read the signing identifier at offset %d: %d", cursor, error);
insert_error = EINVAL;
break;
}
new_node_idx = flow_divert_trie_insert(&new_trie, new_trie.bytes_free_next, sid_size);
if (new_node_idx == NULL_TRIE_IDX) {
insert_error = EINVAL;
break;
}
} else {
FDLOG0(LOG_ERR, &nil_pcb, "No place to put signing ID for insertion");
insert_error = ENOBUFS;
break;
}
}
if (!insert_error) {
group->signing_id_trie = new_trie;
} else {
kfree_data(new_trie.memory, trie_memory_size);
}
lck_rw_done(&group->lck);
}
static void
flow_divert_handle_flow_states_request(struct flow_divert_group *group)
{
struct flow_divert_pcb *fd_cb;
mbuf_t packet = NULL;
SLIST_HEAD(, flow_divert_pcb) tmp_list;
int error = 0;
uint32_t ctl_unit = 0;
SLIST_INIT(&tmp_list);
error = flow_divert_packet_init(&nil_pcb, FLOW_DIVERT_PKT_FLOW_STATES, &packet);
if (error || packet == NULL) {
FDLOG(LOG_ERR, &nil_pcb, "flow_divert_packet_init failed: %d, cannot send flow states", error);
return;
}
lck_rw_lock_shared(&group->lck);
if (!MBUFQ_EMPTY(&group->send_queue)) {
FDLOG0(LOG_WARNING, &nil_pcb, "flow_divert_handle_flow_states_request: group send queue is not empty");
}
ctl_unit = group->ctl_unit;
RB_FOREACH(fd_cb, fd_pcb_tree, &group->pcb_tree) {
FDRETAIN(fd_cb);
SLIST_INSERT_HEAD(&tmp_list, fd_cb, tmp_list_entry);
}
lck_rw_done(&group->lck);
SLIST_FOREACH(fd_cb, &tmp_list, tmp_list_entry) {
FDLOCK(fd_cb);
if (fd_cb->so != NULL) {
struct flow_divert_flow_state state = {};
socket_lock(fd_cb->so, 0);
state.conn_id = fd_cb->hash;
state.bytes_written_by_app = fd_cb->bytes_written_by_app;
state.bytes_sent = fd_cb->bytes_sent;
state.bytes_received = fd_cb->bytes_received;
state.send_window = fd_cb->send_window;
state.send_buffer_bytes = fd_cb->so->so_snd.sb_cc;
error = flow_divert_packet_append_tlv(packet, FLOW_DIVERT_TLV_FLOW_STATE, sizeof(state), &state);
if (error) {
FDLOG(LOG_ERR, fd_cb, "Failed to add a flow state: %d", error);
}
socket_unlock(fd_cb->so, 0);
}
FDUNLOCK(fd_cb);
FDRELEASE(fd_cb);
}
error = ctl_enqueuembuf(g_flow_divert_kctl_ref, ctl_unit, packet, CTL_DATA_EOR);
if (error) {
FDLOG(LOG_NOTICE, &nil_pcb, "flow_divert_handle_flow_states_request: ctl_enqueuembuf returned an error: %d", error);
mbuf_freem(packet);
}
}
static int
flow_divert_input(mbuf_t packet, struct flow_divert_group *group)
{
struct flow_divert_packet_header hdr;
int error = 0;
struct flow_divert_pcb *fd_cb;
if (mbuf_pkthdr_len(packet) < sizeof(hdr)) {
FDLOG(LOG_ERR, &nil_pcb, "got a bad packet, length (%lu) < sizeof hdr (%lu)", mbuf_pkthdr_len(packet), sizeof(hdr));
error = EINVAL;
goto done;
}
error = mbuf_copydata(packet, 0, sizeof(hdr), &hdr);
if (error) {
FDLOG(LOG_ERR, &nil_pcb, "mbuf_copydata failed for the header: %d", error);
error = ENOBUFS;
goto done;
}
hdr.conn_id = ntohl(hdr.conn_id);
if (hdr.conn_id == 0) {
switch (hdr.packet_type) {
case FLOW_DIVERT_PKT_GROUP_INIT:
flow_divert_handle_group_init(group, packet, sizeof(hdr));
break;
case FLOW_DIVERT_PKT_APP_MAP_CREATE:
flow_divert_handle_app_map_create(group, packet, sizeof(hdr));
break;
case FLOW_DIVERT_PKT_FLOW_STATES_REQUEST:
flow_divert_handle_flow_states_request(group);
break;
default:
FDLOG(LOG_WARNING, &nil_pcb, "got an unknown message type: %d", hdr.packet_type);
break;
}
goto done;
}
fd_cb = flow_divert_pcb_lookup(hdr.conn_id, group); /* This retains the PCB */
if (fd_cb == NULL) {
if (hdr.packet_type != FLOW_DIVERT_PKT_CLOSE && hdr.packet_type != FLOW_DIVERT_PKT_READ_NOTIFY) {
FDLOG(LOG_NOTICE, &nil_pcb, "got a %s message from group %d for an unknown pcb: %u", flow_divert_packet_type2str(hdr.packet_type), group->ctl_unit, hdr.conn_id);
}
goto done;
}
switch (hdr.packet_type) {
case FLOW_DIVERT_PKT_CONNECT_RESULT:
flow_divert_handle_connect_result(fd_cb, packet, sizeof(hdr));
break;
case FLOW_DIVERT_PKT_CLOSE:
flow_divert_handle_close(fd_cb, packet, sizeof(hdr));
break;
case FLOW_DIVERT_PKT_DATA:
error = flow_divert_handle_data(fd_cb, packet, sizeof(hdr));
break;
case FLOW_DIVERT_PKT_READ_NOTIFY:
flow_divert_handle_read_notification(fd_cb, packet, sizeof(hdr));
break;
case FLOW_DIVERT_PKT_PROPERTIES_UPDATE:
flow_divert_handle_properties_update(fd_cb, packet, sizeof(hdr));
break;
default:
FDLOG(LOG_WARNING, fd_cb, "got an unknown message type: %d", hdr.packet_type);
break;
}
FDRELEASE(fd_cb);
done:
mbuf_freem(packet);
return error;
}
static void
flow_divert_close_all(struct flow_divert_group *group)
{
struct flow_divert_pcb *fd_cb;
SLIST_HEAD(, flow_divert_pcb) tmp_list;
SLIST_INIT(&tmp_list);
lck_rw_lock_exclusive(&group->lck);
MBUFQ_DRAIN(&group->send_queue);
RB_FOREACH(fd_cb, fd_pcb_tree, &group->pcb_tree) {
FDRETAIN(fd_cb);
SLIST_INSERT_HEAD(&tmp_list, fd_cb, tmp_list_entry);
}
group->flags |= FLOW_DIVERT_GROUP_FLAG_DEFUNCT;
lck_rw_done(&group->lck);
while (!SLIST_EMPTY(&tmp_list)) {
fd_cb = SLIST_FIRST(&tmp_list);
FDLOCK(fd_cb);
SLIST_REMOVE_HEAD(&tmp_list, tmp_list_entry);
if (fd_cb->so != NULL) {
socket_lock(fd_cb->so, 0);
flow_divert_pcb_remove(fd_cb);
flow_divert_update_closed_state(fd_cb, SHUT_RDWR, true, true);
fd_cb->so->so_error = ECONNABORTED;
flow_divert_disconnect_socket(fd_cb->so, !(fd_cb->flags & FLOW_DIVERT_IMPLICIT_CONNECT), false);
socket_unlock(fd_cb->so, 0);
}
FDUNLOCK(fd_cb);
FDRELEASE(fd_cb);
}
}
void
flow_divert_detach(struct socket *so)
{
struct flow_divert_pcb *fd_cb = so->so_fd_pcb;
if (!SO_IS_DIVERTED(so)) {
return;
}
so->so_flags &= ~SOF_FLOW_DIVERT;
so->so_fd_pcb = NULL;
FDLOG(LOG_INFO, fd_cb, "Detaching, ref count = %d", fd_cb->ref_count);
if (fd_cb->group != NULL) {
/* Last-ditch effort to send any buffered data */
flow_divert_send_buffered_data(fd_cb, TRUE);
flow_divert_update_closed_state(fd_cb, SHUT_RDWR, false, true);
flow_divert_send_close_if_needed(fd_cb);
/* Remove from the group */
flow_divert_pcb_remove(fd_cb);
}
socket_unlock(so, 0);
FDLOCK(fd_cb);
fd_cb->so = NULL;
FDUNLOCK(fd_cb);
socket_lock(so, 0);
FDRELEASE(fd_cb); /* Release the socket's reference */
}
static int
flow_divert_close(struct socket *so)
{
struct flow_divert_pcb *fd_cb = so->so_fd_pcb;
if (!SO_IS_DIVERTED(so)) {
return EINVAL;
}
FDLOG0(LOG_INFO, fd_cb, "Closing");
if (SOCK_TYPE(so) == SOCK_STREAM) {
soisdisconnecting(so);
sbflush(&so->so_rcv);
}
flow_divert_send_buffered_data(fd_cb, TRUE);
flow_divert_update_closed_state(fd_cb, SHUT_RDWR, false, true);
flow_divert_send_close_if_needed(fd_cb);
/* Remove from the group */
flow_divert_pcb_remove(fd_cb);
return 0;
}
static int
flow_divert_disconnectx(struct socket *so, sae_associd_t aid,
sae_connid_t cid __unused)
{
if (aid != SAE_ASSOCID_ANY && aid != SAE_ASSOCID_ALL) {
return EINVAL;
}
return flow_divert_close(so);
}
static int
flow_divert_shutdown(struct socket *so)
{
struct flow_divert_pcb *fd_cb = so->so_fd_pcb;
if (!SO_IS_DIVERTED(so)) {
return EINVAL;
}
FDLOG0(LOG_INFO, fd_cb, "Can't send more");
socantsendmore(so);
flow_divert_update_closed_state(fd_cb, SHUT_WR, false, true);
flow_divert_send_close_if_needed(fd_cb);
return 0;
}
static int
flow_divert_rcvd(struct socket *so, int flags __unused)
{
struct flow_divert_pcb *fd_cb = so->so_fd_pcb;
int space = 0;
if (!SO_IS_DIVERTED(so)) {
return EINVAL;
}
space = sbspace(&so->so_rcv);
FDLOG(LOG_DEBUG, fd_cb, "app read bytes, space = %d", space);
if ((fd_cb->flags & FLOW_DIVERT_NOTIFY_ON_RECEIVED) &&
(space > 0) &&
flow_divert_send_read_notification(fd_cb) == 0) {
FDLOG0(LOG_INFO, fd_cb, "Sent a read notification");
fd_cb->flags &= ~FLOW_DIVERT_NOTIFY_ON_RECEIVED;
}
return 0;
}
static int
flow_divert_append_target_endpoint_tlv(mbuf_t connect_packet, struct sockaddr *toaddr)
{
int error = 0;
int port = 0;
if (!flow_divert_is_sockaddr_valid(toaddr)) {
FDLOG(LOG_ERR, &nil_pcb, "Invalid target address, family = %u, length = %u", toaddr->sa_family, toaddr->sa_len);
error = EINVAL;
goto done;
}
error = flow_divert_packet_append_tlv(connect_packet, FLOW_DIVERT_TLV_TARGET_ADDRESS, toaddr->sa_len, toaddr);
if (error) {
goto done;
}
if (toaddr->sa_family == AF_INET) {
port = ntohs((satosin(toaddr))->sin_port);
} else {
port = ntohs((satosin6(toaddr))->sin6_port);
}
error = flow_divert_packet_append_tlv(connect_packet, FLOW_DIVERT_TLV_TARGET_PORT, sizeof(port), &port);
if (error) {
goto done;
}
done:
return error;
}
struct sockaddr *
flow_divert_get_buffered_target_address(mbuf_t buffer)
{
if (buffer != NULL && buffer->m_type == MT_SONAME) {
struct sockaddr *toaddr = mtod(buffer, struct sockaddr *);
if (toaddr != NULL && flow_divert_is_sockaddr_valid(toaddr)) {
return toaddr;
}
}
return NULL;
}
static boolean_t
flow_divert_is_sockaddr_valid(struct sockaddr *addr)
{
switch (addr->sa_family) {
case AF_INET:
if (addr->sa_len < sizeof(struct sockaddr_in)) {
return FALSE;
}
break;
case AF_INET6:
if (addr->sa_len < sizeof(struct sockaddr_in6)) {
return FALSE;
}
break;
default:
return FALSE;
}
return TRUE;
}
static errno_t
flow_divert_dup_addr(sa_family_t family, struct sockaddr *addr,
struct sockaddr **dup)
{
int error = 0;
struct sockaddr *result;
struct sockaddr_storage ss;
if (addr != NULL) {
result = addr;
} else {
memset(&ss, 0, sizeof(ss));
ss.ss_family = family;
if (ss.ss_family == AF_INET) {
ss.ss_len = sizeof(struct sockaddr_in);
} else if (ss.ss_family == AF_INET6) {
ss.ss_len = sizeof(struct sockaddr_in6);
} else {
error = EINVAL;
}
result = (struct sockaddr *)&ss;
}
if (!error) {
*dup = dup_sockaddr(result, 1);
if (*dup == NULL) {
error = ENOBUFS;
}
}
return error;
}
static void
flow_divert_disconnect_socket(struct socket *so, bool is_connected, bool delay_if_needed)
{
if (SOCK_TYPE(so) == SOCK_STREAM || is_connected) {
soisdisconnected(so);
}
if (SOCK_TYPE(so) == SOCK_DGRAM) {
struct inpcb *inp = sotoinpcb(so);
if (inp != NULL && !(so->so_flags & SOF_PCBCLEARING)) {
/*
* Let NetworkStatistics know this PCB is going away
* before we detach it.
*/
if (nstat_collect && (SOCK_PROTO(so) == IPPROTO_TCP || SOCK_PROTO(so) == IPPROTO_UDP)) {
nstat_pcb_detach(inp);
}
if (SOCK_DOM(so) == PF_INET6) {
ROUTE_RELEASE(&inp->in6p_route);
} else {
ROUTE_RELEASE(&inp->inp_route);
}
if (delay_if_needed) {
(void) cfil_sock_is_dead(so);
} else {
inp->inp_state = INPCB_STATE_DEAD;
inpcb_gc_sched(inp->inp_pcbinfo, INPCB_TIMER_FAST);
}
/* makes sure we're not called twice from so_close */
so->so_flags |= SOF_PCBCLEARING;
}
}
}
static errno_t
flow_divert_ctloutput(struct socket *so, struct sockopt *sopt)
{
struct flow_divert_pcb *fd_cb = so->so_fd_pcb;
if (!SO_IS_DIVERTED(so)) {
return EINVAL;
}
if (sopt->sopt_name == SO_TRAFFIC_CLASS) {
if (sopt->sopt_dir == SOPT_SET && fd_cb->flags & FLOW_DIVERT_CONNECT_STARTED) {
flow_divert_send_traffic_class_update(fd_cb, so->so_traffic_class);
}
}
if (SOCK_DOM(so) == PF_INET) {
return g_tcp_protosw->pr_ctloutput(so, sopt);
} else if (SOCK_DOM(so) == PF_INET6) {
return g_tcp6_protosw->pr_ctloutput(so, sopt);
}
return 0;
}
static errno_t
flow_divert_connect_out_internal(struct socket *so, struct sockaddr *to, proc_t p, bool implicit)
{
struct flow_divert_pcb *fd_cb = so->so_fd_pcb;
int error = 0;
struct inpcb *inp = sotoinpcb(so);
struct sockaddr_in *sinp;
mbuf_t connect_packet = NULL;
int do_send = 1;
if (!SO_IS_DIVERTED(so)) {
return EINVAL;
}
if (fd_cb->group == NULL) {
error = ENETUNREACH;
goto done;
}
if (inp == NULL) {
error = EINVAL;
goto done;
} else if (inp->inp_state == INPCB_STATE_DEAD) {
if (so->so_error) {
error = so->so_error;
so->so_error = 0;
} else {
error = EINVAL;
}
goto done;
}
if (fd_cb->flags & FLOW_DIVERT_CONNECT_STARTED) {
error = EALREADY;
goto done;
}
FDLOG0(LOG_INFO, fd_cb, "Connecting");
if (fd_cb->connect_packet == NULL) {
struct sockaddr_in sin = {};
struct ifnet *ifp = NULL;
if (to == NULL) {
FDLOG0(LOG_ERR, fd_cb, "No destination address available when creating connect packet");
error = EINVAL;
goto done;
}
if (!flow_divert_is_sockaddr_valid(to)) {
FDLOG0(LOG_ERR, fd_cb, "Destination address is not valid when creating connect packet");
error = EINVAL;
goto done;
}
fd_cb->original_remote_endpoint = dup_sockaddr(to, 0);
if (fd_cb->original_remote_endpoint == NULL) {
FDLOG0(LOG_ERR, fd_cb, "Failed to dup the remote endpoint");
error = ENOMEM;
goto done;
}
fd_cb->original_vflag = inp->inp_vflag;
fd_cb->original_last_outifp = inp->inp_last_outifp;
fd_cb->original_last_outifp6 = inp->in6p_last_outifp;
sinp = (struct sockaddr_in *)(void *)to;
if (sinp->sin_family == AF_INET && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
error = EAFNOSUPPORT;
goto done;
}
if (to->sa_family == AF_INET6 && !(inp->inp_flags & IN6P_IPV6_V6ONLY)) {
struct sockaddr_in6 sin6 = {};
sin6.sin6_family = AF_INET6;
sin6.sin6_len = sizeof(struct sockaddr_in6);
sin6.sin6_port = satosin6(to)->sin6_port;
sin6.sin6_addr = satosin6(to)->sin6_addr;
if (IN6_IS_ADDR_V4MAPPED(&(sin6.sin6_addr))) {
in6_sin6_2_sin(&sin, &sin6);
to = (struct sockaddr *)&sin;
}
}
if (to->sa_family == AF_INET6) {
struct sockaddr_in6 *to6 = satosin6(to);
inp->inp_vflag &= ~INP_IPV4;
inp->inp_vflag |= INP_IPV6;
fd_cb->local_endpoint.sin6.sin6_len = sizeof(struct sockaddr_in6);
fd_cb->local_endpoint.sin6.sin6_family = AF_INET6;
fd_cb->local_endpoint.sin6.sin6_port = inp->inp_lport;
error = in6_pcbladdr(inp, to, &(fd_cb->local_endpoint.sin6.sin6_addr), &ifp);
if (error) {
FDLOG(LOG_WARNING, fd_cb, "failed to get a local IPv6 address: %d", error);
if (!(fd_cb->flags & FLOW_DIVERT_FLOW_IS_TRANSPARENT) || IN6_IS_ADDR_UNSPECIFIED(&(satosin6(to)->sin6_addr))) {
error = 0;
} else {
goto done;
}
}
if (ifp != NULL) {
inp->in6p_last_outifp = ifp;
ifnet_release(ifp);
}
if (IN6_IS_SCOPE_EMBED(&(fd_cb->local_endpoint.sin6.sin6_addr)) &&
in6_embedded_scope &&
fd_cb->local_endpoint.sin6.sin6_addr.s6_addr16[1] != 0) {
fd_cb->local_endpoint.sin6.sin6_scope_id = ntohs(fd_cb->local_endpoint.sin6.sin6_addr.s6_addr16[1]);
fd_cb->local_endpoint.sin6.sin6_addr.s6_addr16[1] = 0;
}
if (IN6_IS_SCOPE_EMBED(&(to6->sin6_addr)) &&
in6_embedded_scope &&
to6->sin6_addr.s6_addr16[1] != 0) {
to6->sin6_scope_id = ntohs(to6->sin6_addr.s6_addr16[1]);
to6->sin6_addr.s6_addr16[1] = 0;
}
} else if (to->sa_family == AF_INET) {
inp->inp_vflag |= INP_IPV4;
inp->inp_vflag &= ~INP_IPV6;
fd_cb->local_endpoint.sin.sin_len = sizeof(struct sockaddr_in);
fd_cb->local_endpoint.sin.sin_family = AF_INET;
fd_cb->local_endpoint.sin.sin_port = inp->inp_lport;
error = in_pcbladdr(inp, to, &(fd_cb->local_endpoint.sin.sin_addr), IFSCOPE_NONE, &ifp, 0);
if (error) {
FDLOG(LOG_WARNING, fd_cb, "failed to get a local IPv4 address: %d", error);
if (!(fd_cb->flags & FLOW_DIVERT_FLOW_IS_TRANSPARENT) || satosin(to)->sin_addr.s_addr == INADDR_ANY) {
error = 0;
} else {
goto done;
}
}
if (ifp != NULL) {
inp->inp_last_outifp = ifp;
ifnet_release(ifp);
}
} else {
FDLOG(LOG_WARNING, fd_cb, "target address has an unsupported family: %d", to->sa_family);
}
error = flow_divert_check_no_cellular(fd_cb) ||
flow_divert_check_no_expensive(fd_cb) ||
flow_divert_check_no_constrained(fd_cb);
if (error) {
goto done;
}
if (SOCK_TYPE(so) == SOCK_STREAM || /* TCP or */
!implicit || /* connect() was called or */
((inp->inp_vflag & INP_IPV6) && !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) || /* local address is not un-specified */
((inp->inp_vflag & INP_IPV4) && inp->inp_laddr.s_addr != INADDR_ANY)) {
fd_cb->flags |= FLOW_DIVERT_SHOULD_SET_LOCAL_ADDR;
}
error = flow_divert_create_connect_packet(fd_cb, to, so, p, &connect_packet);
if (error) {
goto done;
}
if (!implicit || SOCK_TYPE(so) == SOCK_STREAM) {
flow_divert_set_remote_endpoint(fd_cb, to);
flow_divert_set_local_endpoint(fd_cb, SA(&fd_cb->local_endpoint));
}
if (implicit) {
fd_cb->flags |= FLOW_DIVERT_IMPLICIT_CONNECT;
}
if (so->so_flags1 & SOF1_PRECONNECT_DATA) {
FDLOG0(LOG_INFO, fd_cb, "Delaying sending the connect packet until send or receive");
do_send = 0;
}
fd_cb->connect_packet = connect_packet;
connect_packet = NULL;
} else {
FDLOG0(LOG_INFO, fd_cb, "Sending saved connect packet");
}
if (do_send) {
error = flow_divert_send_connect_packet(fd_cb);
if (error) {
goto done;
}
fd_cb->flags |= FLOW_DIVERT_CONNECT_STARTED;
}
if (SOCK_TYPE(so) == SOCK_DGRAM && !(fd_cb->flags & FLOW_DIVERT_HAS_TOKEN)) {
soisconnected(so);
} else {
soisconnecting(so);
}
done:
return error;
}
errno_t
flow_divert_connect_out(struct socket *so, struct sockaddr *to, proc_t p)
{
#if CONTENT_FILTER
if (SOCK_TYPE(so) == SOCK_STREAM && !(so->so_flags & SOF_CONTENT_FILTER)) {
int error = cfil_sock_attach(so, NULL, to, CFS_CONNECTION_DIR_OUT);
if (error != 0) {
struct flow_divert_pcb *fd_cb = so->so_fd_pcb;
FDLOG(LOG_ERR, fd_cb, "Failed to attach cfil: %d", error);
return error;
}
}
#endif /* CONTENT_FILTER */
return flow_divert_connect_out_internal(so, to, p, false);
}
static int
flow_divert_connectx_out_common(struct socket *so, struct sockaddr *dst,
struct proc *p, uint32_t ifscope, sae_connid_t *pcid, struct uio *auio, user_ssize_t *bytes_written)
{
struct inpcb *inp = sotoinpcb(so);
int error;
if (inp == NULL) {
return EINVAL;
}
VERIFY(dst != NULL);
#if CONTENT_FILTER && NECP
struct flow_divert_pcb *fd_cb = so->so_fd_pcb;
if (fd_cb != NULL && (fd_cb->flags & FLOW_DIVERT_HAS_TOKEN) &&
SOCK_TYPE(so) == SOCK_STREAM && !(so->so_flags & SOF_CONTENT_FILTER)) {
inp_update_necp_policy(sotoinpcb(so), NULL, dst, 0);
}
#endif /* CONTENT_FILTER */
/* bind socket to the specified interface, if requested */
if (ifscope != IFSCOPE_NONE &&
(error = inp_bindif(inp, ifscope, NULL)) != 0) {
return error;
}
error = flow_divert_connect_out(so, dst, p);
if (error != 0) {
return error;
}
/* if there is data, send it */
if (auio != NULL) {
user_ssize_t datalen = 0;
socket_unlock(so, 0);
VERIFY(bytes_written != NULL);
datalen = uio_resid(auio);
error = so->so_proto->pr_usrreqs->pru_sosend(so, NULL, (uio_t)auio, NULL, NULL, 0);
socket_lock(so, 0);
if (error == 0 || error == EWOULDBLOCK) {
*bytes_written = datalen - uio_resid(auio);
}
/*
* sosend returns EWOULDBLOCK if it's a non-blocking
* socket or a timeout occured (this allows to return
* the amount of queued data through sendit()).
*
* However, connectx() returns EINPROGRESS in case of a
* blocking socket. So we change the return value here.
*/
if (error == EWOULDBLOCK) {
error = EINPROGRESS;
}
}
if (error == 0 && pcid != NULL) {
*pcid = 1; /* there is only 1 connection for a TCP */
}
return error;
}
static int
flow_divert_connectx_out(struct socket *so, struct sockaddr *src __unused,
struct sockaddr *dst, struct proc *p, uint32_t ifscope,
sae_associd_t aid __unused, sae_connid_t *pcid, uint32_t flags __unused, void *arg __unused,
uint32_t arglen __unused, struct uio *uio, user_ssize_t *bytes_written)
{
return flow_divert_connectx_out_common(so, dst, p, ifscope, pcid, uio, bytes_written);
}
static int
flow_divert_connectx6_out(struct socket *so, struct sockaddr *src __unused,
struct sockaddr *dst, struct proc *p, uint32_t ifscope,
sae_associd_t aid __unused, sae_connid_t *pcid, uint32_t flags __unused, void *arg __unused,
uint32_t arglen __unused, struct uio *uio, user_ssize_t *bytes_written)
{
return flow_divert_connectx_out_common(so, dst, p, ifscope, pcid, uio, bytes_written);
}
static errno_t
flow_divert_data_out(struct socket *so, int flags, mbuf_t data, struct sockaddr *to, mbuf_t control, struct proc *p)
{
struct flow_divert_pcb *fd_cb = so->so_fd_pcb;
int error = 0;
struct inpcb *inp;
#if CONTENT_FILTER
struct m_tag *cfil_tag = NULL;
#endif
if (!SO_IS_DIVERTED(so)) {
return EINVAL;
}
inp = sotoinpcb(so);
if (inp == NULL || inp->inp_state == INPCB_STATE_DEAD) {
error = ECONNRESET;
goto done;
}
if ((fd_cb->flags & FLOW_DIVERT_TUNNEL_WR_CLOSED) && SOCK_TYPE(so) == SOCK_DGRAM) {
/* The provider considers this datagram flow to be closed, so no data can be sent */
FDLOG0(LOG_INFO, fd_cb, "provider is no longer accepting writes, cannot send data");
error = EHOSTUNREACH;
goto done;
}
#if CONTENT_FILTER
/*
* If the socket is subject to a UDP Content Filter and no remote address is passed in,
* retrieve the CFIL saved remote address from the mbuf and use it.
*/
if (to == NULL && CFIL_DGRAM_FILTERED(so)) {
struct sockaddr *cfil_faddr = NULL;
cfil_tag = cfil_dgram_get_socket_state(data, NULL, NULL, &cfil_faddr, NULL);
if (cfil_tag) {
to = (struct sockaddr *)(void *)cfil_faddr;
}
FDLOG(LOG_INFO, fd_cb, "Using remote address from CFIL saved state: %p", to);
}
#endif
/* Implicit connect */
if (!(fd_cb->flags & FLOW_DIVERT_CONNECT_STARTED)) {
FDLOG0(LOG_INFO, fd_cb, "implicit connect");
error = flow_divert_connect_out_internal(so, to, p, true);
if (error) {
goto done;
}
} else {
error = flow_divert_check_no_cellular(fd_cb) ||
flow_divert_check_no_expensive(fd_cb) ||
flow_divert_check_no_constrained(fd_cb);
if (error) {
goto done;
}
}
if (data != NULL) {
size_t data_size = 0;
if (mbuf_flags(data) & M_PKTHDR) {
data_size = mbuf_pkthdr_len(data);
} else {
for (mbuf_t blob = data; blob != NULL; blob = mbuf_next(blob)) {
data_size += mbuf_len(blob);
}
}
FDLOG(LOG_DEBUG, fd_cb, "app wrote %lu bytes", data_size);
fd_cb->bytes_written_by_app += data_size;
error = flow_divert_send_app_data(fd_cb, data, data_size, to);
data = NULL;
if (error) {
goto done;
}
}
if (flags & PRUS_EOF) {
flow_divert_shutdown(so);
}
done:
if (data) {
mbuf_freem(data);
}
if (control) {
mbuf_free(control);
}
#if CONTENT_FILTER
if (cfil_tag) {
m_tag_free(cfil_tag);
}
#endif
return error;
}
static int
flow_divert_preconnect(struct socket *so)
{
int error = 0;
struct flow_divert_pcb *fd_cb = so->so_fd_pcb;
if (!SO_IS_DIVERTED(so)) {
return EINVAL;
}
if (!(fd_cb->flags & FLOW_DIVERT_CONNECT_STARTED)) {
FDLOG0(LOG_INFO, fd_cb, "Pre-connect read: sending saved connect packet");
error = flow_divert_send_connect_packet(so->so_fd_pcb);
if (error) {
return error;
}
fd_cb->flags |= FLOW_DIVERT_CONNECT_STARTED;
}
soclearfastopen(so);
return error;
}
static void
flow_divert_set_protosw(struct socket *so)
{
if (SOCK_DOM(so) == PF_INET) {
so->so_proto = &g_flow_divert_in_protosw;
} else {
so->so_proto = (struct protosw *)&g_flow_divert_in6_protosw;
}
}
static void
flow_divert_set_udp_protosw(struct socket *so)
{
if (SOCK_DOM(so) == PF_INET) {
so->so_proto = &g_flow_divert_in_udp_protosw;
} else {
so->so_proto = (struct protosw *)&g_flow_divert_in6_udp_protosw;
}
}
errno_t
flow_divert_implicit_data_out(struct socket *so, int flags, mbuf_t data, struct sockaddr *to, mbuf_t control, struct proc *p)
{
struct flow_divert_pcb *fd_cb = so->so_fd_pcb;
struct inpcb *inp;
int error = 0;
inp = sotoinpcb(so);
if (inp == NULL) {
return EINVAL;
}
if (fd_cb == NULL) {
error = flow_divert_pcb_init(so);
fd_cb = so->so_fd_pcb;
if (error != 0 || fd_cb == NULL) {
goto done;
}
}
return flow_divert_data_out(so, flags, data, to, control, p);
done:
if (data) {
mbuf_freem(data);
}
if (control) {
mbuf_free(control);
}
return error;
}
static errno_t
flow_divert_pcb_init_internal(struct socket *so, uint32_t ctl_unit, uint32_t aggregate_unit)
{
errno_t error = 0;
struct flow_divert_pcb *fd_cb = NULL;
uint32_t agg_unit = aggregate_unit;
uint32_t policy_control_unit = ctl_unit;
bool is_aggregate = false;
if (so->so_flags & SOF_FLOW_DIVERT) {
return EALREADY;
}
fd_cb = flow_divert_pcb_create(so);
if (fd_cb == NULL) {
return ENOMEM;
}
do {
uint32_t group_unit = flow_divert_derive_kernel_control_unit(so->last_pid, &policy_control_unit, &agg_unit, &is_aggregate);
if (group_unit == 0 || (group_unit >= GROUP_COUNT_MAX && group_unit < FLOW_DIVERT_IN_PROCESS_UNIT_MIN)) {
FDLOG0(LOG_ERR, fd_cb, "No valid group is available, cannot init flow divert");
error = EINVAL;
break;
}
error = flow_divert_add_to_group(fd_cb, group_unit);
if (error == 0) {
so->so_fd_pcb = fd_cb;
so->so_flags |= SOF_FLOW_DIVERT;
fd_cb->control_group_unit = group_unit;
fd_cb->policy_control_unit = ctl_unit;
fd_cb->aggregate_unit = agg_unit;
if (is_aggregate) {
fd_cb->flags |= FLOW_DIVERT_FLOW_IS_TRANSPARENT;
} else {
fd_cb->flags &= ~FLOW_DIVERT_FLOW_IS_TRANSPARENT;
}
if (SOCK_TYPE(so) == SOCK_STREAM) {
flow_divert_set_protosw(so);
} else if (SOCK_TYPE(so) == SOCK_DGRAM) {
flow_divert_set_udp_protosw(so);
}
FDLOG0(LOG_INFO, fd_cb, "Created");
} else if (error != ENOENT) {
FDLOG(LOG_ERR, fd_cb, "pcb insert failed: %d", error);
}
} while (error == ENOENT);
if (error != 0) {
FDRELEASE(fd_cb);
}
return error;
}
errno_t
flow_divert_pcb_init(struct socket *so)
{
struct inpcb *inp = sotoinpcb(so);
uint32_t aggregate_units = 0;
uint32_t ctl_unit = necp_socket_get_flow_divert_control_unit(inp, &aggregate_units);
return flow_divert_pcb_init_internal(so, ctl_unit, aggregate_units);
}
errno_t
flow_divert_token_set(struct socket *so, struct sockopt *sopt)
{
uint32_t ctl_unit = 0;
uint32_t key_unit = 0;
uint32_t aggregate_unit = 0;
int error = 0;
int hmac_error = 0;
mbuf_t token = NULL;
if (so->so_flags & SOF_FLOW_DIVERT) {
error = EALREADY;
goto done;
}
if (g_init_result) {
FDLOG(LOG_ERR, &nil_pcb, "flow_divert_init failed (%d), cannot use flow divert", g_init_result);
error = ENOPROTOOPT;
goto done;
}
if ((SOCK_TYPE(so) != SOCK_STREAM && SOCK_TYPE(so) != SOCK_DGRAM) ||
(SOCK_PROTO(so) != IPPROTO_TCP && SOCK_PROTO(so) != IPPROTO_UDP) ||
(SOCK_DOM(so) != PF_INET && SOCK_DOM(so) != PF_INET6)) {
error = EINVAL;
goto done;
} else {
if (SOCK_TYPE(so) == SOCK_STREAM && SOCK_PROTO(so) == IPPROTO_TCP) {
struct tcpcb *tp = sototcpcb(so);
if (tp == NULL || tp->t_state != TCPS_CLOSED) {
error = EINVAL;
goto done;
}
}
}
error = soopt_getm(sopt, &token);
if (error) {
token = NULL;
goto done;
}
error = soopt_mcopyin(sopt, token);
if (error) {
token = NULL;
goto done;
}
error = flow_divert_packet_get_tlv(token, 0, FLOW_DIVERT_TLV_KEY_UNIT, sizeof(key_unit), (void *)&key_unit, NULL);
if (!error) {
key_unit = ntohl(key_unit);
if (key_unit >= GROUP_COUNT_MAX) {
key_unit = 0;
}
} else if (error != ENOENT) {
FDLOG(LOG_ERR, &nil_pcb, "Failed to get the key unit from the token: %d", error);
goto done;
} else {
key_unit = 0;
}
error = flow_divert_packet_get_tlv(token, 0, FLOW_DIVERT_TLV_CTL_UNIT, sizeof(ctl_unit), (void *)&ctl_unit, NULL);
if (error) {
FDLOG(LOG_ERR, &nil_pcb, "Failed to get the control socket unit from the token: %d", error);
goto done;
}
error = flow_divert_packet_get_tlv(token, 0, FLOW_DIVERT_TLV_AGGREGATE_UNIT, sizeof(aggregate_unit), (void *)&aggregate_unit, NULL);
if (error && error != ENOENT) {
FDLOG(LOG_ERR, &nil_pcb, "Failed to get the aggregate unit from the token: %d", error);
goto done;
}
/* A valid kernel control unit is required */
ctl_unit = ntohl(ctl_unit);
aggregate_unit = ntohl(aggregate_unit);
if (ctl_unit > 0 && ctl_unit < GROUP_COUNT_MAX) {
hmac_error = flow_divert_packet_verify_hmac(token, (key_unit != 0 ? key_unit : ctl_unit));
if (hmac_error && hmac_error != ENOENT) {
FDLOG(LOG_ERR, &nil_pcb, "HMAC verfication failed: %d", hmac_error);
error = hmac_error;
goto done;
}
}
error = flow_divert_pcb_init_internal(so, ctl_unit, aggregate_unit);
if (error == 0) {
struct flow_divert_pcb *fd_cb = so->so_fd_pcb;
int log_level = LOG_NOTICE;
error = flow_divert_packet_get_tlv(token, 0, FLOW_DIVERT_TLV_LOG_LEVEL, sizeof(log_level), &log_level, NULL);
if (error == 0) {
fd_cb->log_level = (uint8_t)log_level;
}
error = 0;
fd_cb->connect_token = token;
token = NULL;
fd_cb->flags |= FLOW_DIVERT_HAS_TOKEN;
}
if (hmac_error == 0) {
struct flow_divert_pcb *fd_cb = so->so_fd_pcb;
if (fd_cb != NULL) {
fd_cb->flags |= FLOW_DIVERT_HAS_HMAC;
}
}
done:
if (token != NULL) {
mbuf_freem(token);
}
return error;
}
errno_t
flow_divert_token_get(struct socket *so, struct sockopt *sopt)
{
uint32_t ctl_unit;
int error = 0;
uint8_t hmac[SHA_DIGEST_LENGTH];
struct flow_divert_pcb *fd_cb = so->so_fd_pcb;
mbuf_t token = NULL;
struct flow_divert_group *control_group = NULL;
if (!SO_IS_DIVERTED(so)) {
error = EINVAL;
goto done;
}
if (fd_cb->group == NULL) {
error = EINVAL;
goto done;
}
error = mbuf_gethdr(MBUF_DONTWAIT, MBUF_TYPE_HEADER, &token);
if (error) {
FDLOG(LOG_ERR, fd_cb, "failed to allocate the header mbuf: %d", error);
goto done;
}
ctl_unit = htonl(fd_cb->group->ctl_unit);
error = flow_divert_packet_append_tlv(token, FLOW_DIVERT_TLV_CTL_UNIT, sizeof(ctl_unit), &ctl_unit);
if (error) {
goto done;
}
error = flow_divert_packet_append_tlv(token, FLOW_DIVERT_TLV_FLOW_ID, sizeof(fd_cb->hash), &fd_cb->hash);
if (error) {
goto done;
}
if (fd_cb->app_data != NULL) {
error = flow_divert_packet_append_tlv(token, FLOW_DIVERT_TLV_APP_DATA, (uint32_t)fd_cb->app_data_length, fd_cb->app_data);
if (error) {
goto done;
}
}
control_group = flow_divert_group_lookup(fd_cb->control_group_unit, fd_cb);
if (control_group != NULL) {
lck_rw_lock_shared(&control_group->lck);
ctl_unit = htonl(control_group->ctl_unit);
error = flow_divert_packet_append_tlv(token, FLOW_DIVERT_TLV_KEY_UNIT, sizeof(ctl_unit), &ctl_unit);
if (!error) {
error = flow_divert_packet_compute_hmac(token, control_group, hmac);
}
lck_rw_done(&control_group->lck);
FDGRP_RELEASE(control_group);
} else {
error = ENOPROTOOPT;
}
if (error) {
goto done;
}
error = flow_divert_packet_append_tlv(token, FLOW_DIVERT_TLV_HMAC, sizeof(hmac), hmac);
if (error) {
goto done;
}
if (sopt->sopt_val == USER_ADDR_NULL) {
/* If the caller passed NULL to getsockopt, just set the size of the token and return */
sopt->sopt_valsize = mbuf_pkthdr_len(token);
goto done;
}
error = soopt_mcopyout(sopt, token);
if (error) {
token = NULL; /* For some reason, soopt_mcopyout() frees the mbuf if it fails */
goto done;
}
done:
if (token != NULL) {
mbuf_freem(token);
}
return error;
}
void
flow_divert_group_destroy(struct flow_divert_group *group)
{
lck_rw_lock_exclusive(&group->lck);
FDLOG(LOG_NOTICE, &nil_pcb, "Destroying group %u", group->ctl_unit);
if (group->token_key != NULL) {
memset(group->token_key, 0, group->token_key_size);
kfree_data(group->token_key, group->token_key_size);
group->token_key = NULL;
group->token_key_size = 0;
}
/* Re-set the current trie */
if (group->signing_id_trie.memory != NULL) {
kfree_data_addr(group->signing_id_trie.memory);
}
memset(&group->signing_id_trie, 0, sizeof(group->signing_id_trie));
group->signing_id_trie.root = NULL_TRIE_IDX;
lck_rw_done(&group->lck);
zfree(flow_divert_group_zone, group);
}
static struct flow_divert_group *
flow_divert_allocate_group(u_int32_t unit, pid_t pid)
{
struct flow_divert_group *new_group = NULL;
new_group = zalloc_flags(flow_divert_group_zone, Z_WAITOK | Z_ZERO);
lck_rw_init(&new_group->lck, &flow_divert_mtx_grp, &flow_divert_mtx_attr);
RB_INIT(&new_group->pcb_tree);
new_group->ctl_unit = unit;
new_group->in_process_pid = pid;
MBUFQ_INIT(&new_group->send_queue);
new_group->signing_id_trie.root = NULL_TRIE_IDX;
new_group->ref_count = 1;
new_group->order = FLOW_DIVERT_ORDER_LAST;
return new_group;
}
static errno_t
flow_divert_kctl_setup(u_int32_t *unit, void **unitinfo)
{
if (unit == NULL || unitinfo == NULL) {
return EINVAL;
}
struct flow_divert_group *new_group = NULL;
errno_t error = 0;
lck_rw_lock_shared(&g_flow_divert_group_lck);
if (*unit == FLOW_DIVERT_IN_PROCESS_UNIT) {
// Return next unused in-process unit
u_int32_t unit_cursor = FLOW_DIVERT_IN_PROCESS_UNIT_MIN;
struct flow_divert_group *group_next = NULL;
TAILQ_FOREACH(group_next, &g_flow_divert_in_process_group_list, chain) {
if (group_next->ctl_unit > unit_cursor) {
// Found a gap, lets fill it in
break;
}
unit_cursor = group_next->ctl_unit + 1;
if (unit_cursor == FLOW_DIVERT_IN_PROCESS_UNIT_MAX) {
break;
}
}
if (unit_cursor == FLOW_DIVERT_IN_PROCESS_UNIT_MAX) {
error = EBUSY;
} else {
*unit = unit_cursor;
new_group = flow_divert_allocate_group(*unit, proc_pid(current_proc()));
if (group_next != NULL) {
TAILQ_INSERT_BEFORE(group_next, new_group, chain);
} else {
TAILQ_INSERT_TAIL(&g_flow_divert_in_process_group_list, new_group, chain);
}
g_active_group_count++;
}
} else {
if (kauth_cred_issuser(kauth_cred_get()) == 0) {
error = EPERM;
} else {
if (g_flow_divert_groups == NULL) {
g_flow_divert_groups = kalloc_type(struct flow_divert_group *,
GROUP_COUNT_MAX, Z_WAITOK | Z_ZERO | Z_NOFAIL);
}
// Return next unused group unit
bool found_unused_unit = false;
u_int32_t unit_cursor;
for (unit_cursor = 1; unit_cursor < GROUP_COUNT_MAX; unit_cursor++) {
struct flow_divert_group *group = g_flow_divert_groups[unit_cursor];
if (group == NULL) {
// Open slot, assign this one
*unit = unit_cursor;
new_group = flow_divert_allocate_group(*unit, 0);
g_flow_divert_groups[*unit] = new_group;
found_unused_unit = true;
g_active_group_count++;
break;
}
}
if (!found_unused_unit) {
error = EBUSY;
}
}
}
lck_rw_done(&g_flow_divert_group_lck);
*unitinfo = new_group;
return error;
}
static errno_t
flow_divert_kctl_connect(kern_ctl_ref kctlref __unused, struct sockaddr_ctl *sac, void **unitinfo)
{
if (unitinfo == NULL) {
return EINVAL;
}
// Just validate. The group will already have been allocated.
struct flow_divert_group *group = (struct flow_divert_group *)*unitinfo;
if (group == NULL || sac->sc_unit != group->ctl_unit) {
FDLOG(LOG_ERR, &nil_pcb, "Flow divert connect fail, unit mismatch %u != %u",
sac->sc_unit, group ? group->ctl_unit : 0);
return EINVAL;
}
return 0;
}
static errno_t
flow_divert_kctl_disconnect(kern_ctl_ref kctlref __unused, uint32_t unit, void *unitinfo)
{
struct flow_divert_group *group = NULL;
errno_t error = 0;
if (unitinfo == NULL) {
return 0;
}
FDLOG(LOG_INFO, &nil_pcb, "disconnecting group %d", unit);
lck_rw_lock_exclusive(&g_flow_divert_group_lck);
if (g_active_group_count == 0) {
panic("flow divert group %u is disconnecting, but no groups are active (active count = %u)",
unit, g_active_group_count);
}
if (unit < FLOW_DIVERT_IN_PROCESS_UNIT_MIN) {
if (unit >= GROUP_COUNT_MAX) {
return EINVAL;
}
if (g_flow_divert_groups == NULL) {
panic("flow divert group %u is disconnecting, but groups array is NULL",
unit);
}
group = g_flow_divert_groups[unit];
if (group != (struct flow_divert_group *)unitinfo) {
panic("group with unit %d (%p) != unit info (%p)", unit, group, unitinfo);
}
g_flow_divert_groups[unit] = NULL;
} else {
group = (struct flow_divert_group *)unitinfo;
if (TAILQ_EMPTY(&g_flow_divert_in_process_group_list)) {
panic("flow divert group %u is disconnecting, but in-process group list is empty",
unit);
}
TAILQ_REMOVE(&g_flow_divert_in_process_group_list, group, chain);
}
g_active_group_count--;
if (g_active_group_count == 0) {
kfree_type(struct flow_divert_group *,
GROUP_COUNT_MAX, g_flow_divert_groups);
g_flow_divert_groups = NULL;
}
lck_rw_done(&g_flow_divert_group_lck);
if (group != NULL) {
flow_divert_close_all(group);
FDGRP_RELEASE(group);
} else {
error = EINVAL;
}
return error;
}
static errno_t
flow_divert_kctl_send(__unused kern_ctl_ref kctlref, uint32_t unit, __unused void *unitinfo, mbuf_t m, __unused int flags)
{
errno_t error = 0;
struct flow_divert_group *group = flow_divert_group_lookup(unit, NULL);
if (group != NULL) {
error = flow_divert_input(m, group);
FDGRP_RELEASE(group);
} else {
error = ENOENT;
}
return error;
}
static void
flow_divert_kctl_rcvd(__unused kern_ctl_ref kctlref, uint32_t unit, __unused void *unitinfo, __unused int flags)
{
struct flow_divert_group *group = flow_divert_group_lookup(unit, NULL);
if (group == NULL) {
return;
}
if (!OSTestAndClear(GROUP_BIT_CTL_ENQUEUE_BLOCKED, &group->atomic_bits)) {
struct flow_divert_pcb *fd_cb;
SLIST_HEAD(, flow_divert_pcb) tmp_list;
lck_rw_lock_exclusive(&group->lck);
while (!MBUFQ_EMPTY(&group->send_queue)) {
mbuf_t next_packet;
FDLOG0(LOG_DEBUG, &nil_pcb, "trying ctl_enqueuembuf again");
next_packet = MBUFQ_FIRST(&group->send_queue);
int error = ctl_enqueuembuf(g_flow_divert_kctl_ref, group->ctl_unit, next_packet, CTL_DATA_EOR);
if (error) {
FDLOG(LOG_NOTICE, &nil_pcb, "flow_divert_kctl_rcvd: ctl_enqueuembuf returned an error: %d", error);
OSTestAndSet(GROUP_BIT_CTL_ENQUEUE_BLOCKED, &group->atomic_bits);
lck_rw_done(&group->lck);
return;
}
MBUFQ_DEQUEUE(&group->send_queue, next_packet);
}
SLIST_INIT(&tmp_list);
RB_FOREACH(fd_cb, fd_pcb_tree, &group->pcb_tree) {
FDRETAIN(fd_cb);
SLIST_INSERT_HEAD(&tmp_list, fd_cb, tmp_list_entry);
}
lck_rw_done(&group->lck);
SLIST_FOREACH(fd_cb, &tmp_list, tmp_list_entry) {
FDLOCK(fd_cb);
if (fd_cb->so != NULL) {
socket_lock(fd_cb->so, 0);
if (fd_cb->group != NULL) {
flow_divert_send_buffered_data(fd_cb, FALSE);
}
socket_unlock(fd_cb->so, 0);
}
FDUNLOCK(fd_cb);
FDRELEASE(fd_cb);
}
}
FDGRP_RELEASE(group);
}
static int
flow_divert_kctl_init(void)
{
struct kern_ctl_reg ctl_reg;
int result;
memset(&ctl_reg, 0, sizeof(ctl_reg));
strlcpy(ctl_reg.ctl_name, FLOW_DIVERT_CONTROL_NAME, sizeof(ctl_reg.ctl_name));
ctl_reg.ctl_name[sizeof(ctl_reg.ctl_name) - 1] = '\0';
// Do not restrict to privileged processes. flow_divert_kctl_setup checks
// permissions separately.
ctl_reg.ctl_flags = CTL_FLAG_REG_EXTENDED | CTL_FLAG_REG_SETUP;
ctl_reg.ctl_sendsize = FD_CTL_SENDBUFF_SIZE;
ctl_reg.ctl_connect = flow_divert_kctl_connect;
ctl_reg.ctl_disconnect = flow_divert_kctl_disconnect;
ctl_reg.ctl_send = flow_divert_kctl_send;
ctl_reg.ctl_rcvd = flow_divert_kctl_rcvd;
ctl_reg.ctl_setup = flow_divert_kctl_setup;
result = ctl_register(&ctl_reg, &g_flow_divert_kctl_ref);
if (result) {
FDLOG(LOG_ERR, &nil_pcb, "flow_divert_kctl_init - ctl_register failed: %d\n", result);
return result;
}
return 0;
}
void
flow_divert_init(void)
{
memset(&nil_pcb, 0, sizeof(nil_pcb));
nil_pcb.log_level = LOG_NOTICE;
g_tcp_protosw = pffindproto(AF_INET, IPPROTO_TCP, SOCK_STREAM);
VERIFY(g_tcp_protosw != NULL);
memcpy(&g_flow_divert_in_protosw, g_tcp_protosw, sizeof(g_flow_divert_in_protosw));
memcpy(&g_flow_divert_in_usrreqs, g_tcp_protosw->pr_usrreqs, sizeof(g_flow_divert_in_usrreqs));
g_flow_divert_in_usrreqs.pru_connect = flow_divert_connect_out;
g_flow_divert_in_usrreqs.pru_connectx = flow_divert_connectx_out;
g_flow_divert_in_usrreqs.pru_disconnect = flow_divert_close;
g_flow_divert_in_usrreqs.pru_disconnectx = flow_divert_disconnectx;
g_flow_divert_in_usrreqs.pru_rcvd = flow_divert_rcvd;
g_flow_divert_in_usrreqs.pru_send = flow_divert_data_out;
g_flow_divert_in_usrreqs.pru_shutdown = flow_divert_shutdown;
g_flow_divert_in_usrreqs.pru_preconnect = flow_divert_preconnect;
g_flow_divert_in_protosw.pr_usrreqs = &g_flow_divert_in_usrreqs;
g_flow_divert_in_protosw.pr_ctloutput = flow_divert_ctloutput;
/*
* Socket filters shouldn't attach/detach to/from this protosw
* since pr_protosw is to be used instead, which points to the
* real protocol; if they do, it is a bug and we should panic.
*/
g_flow_divert_in_protosw.pr_filter_head.tqh_first =
(struct socket_filter *)(uintptr_t)0xdeadbeefdeadbeef;
g_flow_divert_in_protosw.pr_filter_head.tqh_last =
(struct socket_filter **)(uintptr_t)0xdeadbeefdeadbeef;
/* UDP */
g_udp_protosw = pffindproto(AF_INET, IPPROTO_UDP, SOCK_DGRAM);
VERIFY(g_udp_protosw != NULL);
memcpy(&g_flow_divert_in_udp_protosw, g_udp_protosw, sizeof(g_flow_divert_in_udp_protosw));
memcpy(&g_flow_divert_in_udp_usrreqs, g_udp_protosw->pr_usrreqs, sizeof(g_flow_divert_in_udp_usrreqs));
g_flow_divert_in_udp_usrreqs.pru_connect = flow_divert_connect_out;
g_flow_divert_in_udp_usrreqs.pru_connectx = flow_divert_connectx_out;
g_flow_divert_in_udp_usrreqs.pru_disconnect = flow_divert_close;
g_flow_divert_in_udp_usrreqs.pru_disconnectx = flow_divert_disconnectx;
g_flow_divert_in_udp_usrreqs.pru_rcvd = flow_divert_rcvd;
g_flow_divert_in_udp_usrreqs.pru_send = flow_divert_data_out;
g_flow_divert_in_udp_usrreqs.pru_shutdown = flow_divert_shutdown;
g_flow_divert_in_udp_usrreqs.pru_sosend_list = pru_sosend_list_notsupp;
g_flow_divert_in_udp_usrreqs.pru_preconnect = flow_divert_preconnect;
g_flow_divert_in_udp_protosw.pr_usrreqs = &g_flow_divert_in_usrreqs;
g_flow_divert_in_udp_protosw.pr_ctloutput = flow_divert_ctloutput;
/*
* Socket filters shouldn't attach/detach to/from this protosw
* since pr_protosw is to be used instead, which points to the
* real protocol; if they do, it is a bug and we should panic.
*/
g_flow_divert_in_udp_protosw.pr_filter_head.tqh_first =
(struct socket_filter *)(uintptr_t)0xdeadbeefdeadbeef;
g_flow_divert_in_udp_protosw.pr_filter_head.tqh_last =
(struct socket_filter **)(uintptr_t)0xdeadbeefdeadbeef;
g_tcp6_protosw = (struct ip6protosw *)pffindproto(AF_INET6, IPPROTO_TCP, SOCK_STREAM);
VERIFY(g_tcp6_protosw != NULL);
memcpy(&g_flow_divert_in6_protosw, g_tcp6_protosw, sizeof(g_flow_divert_in6_protosw));
memcpy(&g_flow_divert_in6_usrreqs, g_tcp6_protosw->pr_usrreqs, sizeof(g_flow_divert_in6_usrreqs));
g_flow_divert_in6_usrreqs.pru_connect = flow_divert_connect_out;
g_flow_divert_in6_usrreqs.pru_connectx = flow_divert_connectx6_out;
g_flow_divert_in6_usrreqs.pru_disconnect = flow_divert_close;
g_flow_divert_in6_usrreqs.pru_disconnectx = flow_divert_disconnectx;
g_flow_divert_in6_usrreqs.pru_rcvd = flow_divert_rcvd;
g_flow_divert_in6_usrreqs.pru_send = flow_divert_data_out;
g_flow_divert_in6_usrreqs.pru_shutdown = flow_divert_shutdown;
g_flow_divert_in6_usrreqs.pru_preconnect = flow_divert_preconnect;
g_flow_divert_in6_protosw.pr_usrreqs = &g_flow_divert_in6_usrreqs;
g_flow_divert_in6_protosw.pr_ctloutput = flow_divert_ctloutput;
/*
* Socket filters shouldn't attach/detach to/from this protosw
* since pr_protosw is to be used instead, which points to the
* real protocol; if they do, it is a bug and we should panic.
*/
g_flow_divert_in6_protosw.pr_filter_head.tqh_first =
(struct socket_filter *)(uintptr_t)0xdeadbeefdeadbeef;
g_flow_divert_in6_protosw.pr_filter_head.tqh_last =
(struct socket_filter **)(uintptr_t)0xdeadbeefdeadbeef;
/* UDP6 */
g_udp6_protosw = (struct ip6protosw *)pffindproto(AF_INET6, IPPROTO_UDP, SOCK_DGRAM);
VERIFY(g_udp6_protosw != NULL);
memcpy(&g_flow_divert_in6_udp_protosw, g_udp6_protosw, sizeof(g_flow_divert_in6_udp_protosw));
memcpy(&g_flow_divert_in6_udp_usrreqs, g_udp6_protosw->pr_usrreqs, sizeof(g_flow_divert_in6_udp_usrreqs));
g_flow_divert_in6_udp_usrreqs.pru_connect = flow_divert_connect_out;
g_flow_divert_in6_udp_usrreqs.pru_connectx = flow_divert_connectx6_out;
g_flow_divert_in6_udp_usrreqs.pru_disconnect = flow_divert_close;
g_flow_divert_in6_udp_usrreqs.pru_disconnectx = flow_divert_disconnectx;
g_flow_divert_in6_udp_usrreqs.pru_rcvd = flow_divert_rcvd;
g_flow_divert_in6_udp_usrreqs.pru_send = flow_divert_data_out;
g_flow_divert_in6_udp_usrreqs.pru_shutdown = flow_divert_shutdown;
g_flow_divert_in6_udp_usrreqs.pru_sosend_list = pru_sosend_list_notsupp;
g_flow_divert_in6_udp_usrreqs.pru_preconnect = flow_divert_preconnect;
g_flow_divert_in6_udp_protosw.pr_usrreqs = &g_flow_divert_in6_udp_usrreqs;
g_flow_divert_in6_udp_protosw.pr_ctloutput = flow_divert_ctloutput;
/*
* Socket filters shouldn't attach/detach to/from this protosw
* since pr_protosw is to be used instead, which points to the
* real protocol; if they do, it is a bug and we should panic.
*/
g_flow_divert_in6_udp_protosw.pr_filter_head.tqh_first =
(struct socket_filter *)(uintptr_t)0xdeadbeefdeadbeef;
g_flow_divert_in6_udp_protosw.pr_filter_head.tqh_last =
(struct socket_filter **)(uintptr_t)0xdeadbeefdeadbeef;
TAILQ_INIT(&g_flow_divert_in_process_group_list);
g_init_result = flow_divert_kctl_init();
if (g_init_result) {
goto done;
}
done:
if (g_init_result != 0) {
if (g_flow_divert_kctl_ref != NULL) {
ctl_deregister(g_flow_divert_kctl_ref);
g_flow_divert_kctl_ref = NULL;
}
}
}