X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/d1ecb069dfe24481e4a83f44cb5217a2b06746d7..cc8bc92ae4a8e9f1a1ab61bf83d34ad8150b3405:/bsd/net/if_utun.c diff --git a/bsd/net/if_utun.c b/bsd/net/if_utun.c index 1b35e44b4..5e01509df 100644 --- a/bsd/net/if_utun.c +++ b/bsd/net/if_utun.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2008-2009 Apple Inc. All rights reserved. + * Copyright (c) 2008-2017 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * @@ -45,15 +45,72 @@ This kernel control will register an interface for every client that connects. #include #include #include -#include -#include #include #include #include +#include #include #include #include +#include +#include +#define UTUN_NEXUS 0 + +extern unsigned int if_enable_netagent; + +#if UTUN_NEXUS +static nexus_controller_t utun_ncd; +static int utun_ncd_refcount; +static uuid_t utun_kpipe_uuid; +static uuid_t utun_nx_dom_prov; + +typedef struct utun_nx { + uuid_t if_provider; + uuid_t if_instance; + uuid_t ms_provider; + uuid_t ms_instance; + uuid_t ms_device; + uuid_t ms_host; + uuid_t ms_agent; +} *utun_nx_t; + +#endif // UTUN_NEXUS + +/* Control block allocated for each kernel control connection */ +struct utun_pcb { + TAILQ_ENTRY(utun_pcb) utun_chain; + kern_ctl_ref utun_ctlref; + ifnet_t utun_ifp; + u_int32_t utun_unit; + u_int32_t utun_unique_id; + u_int32_t utun_flags; + int utun_ext_ifdata_stats; + u_int32_t utun_max_pending_packets; + char utun_if_xname[IFXNAMSIZ]; + char utun_unique_name[IFXNAMSIZ]; + // PCB lock protects state fields and rings + decl_lck_rw_data(, utun_pcb_lock); + struct mbuf * utun_input_chain; + struct mbuf * utun_input_chain_last; + // Input chain lock protects the list of input mbufs + // The input chain lock must be taken AFTER the PCB lock if both are held + lck_mtx_t utun_input_chain_lock; + bool utun_output_disabled; + +#if UTUN_NEXUS + struct utun_nx utun_nx; + int utun_kpipe_enabled; + uuid_t utun_kpipe_uuid; + void * utun_kpipe_rxring; + void * utun_kpipe_txring; + + kern_nexus_t utun_netif_nexus; + void * utun_netif_rxring; + void * utun_netif_txring; + uint64_t utun_netif_txring_size; +#endif // UTUN_NEXUS +}; /* Kernel Control functions */ static errno_t utun_ctl_connect(kern_ctl_ref kctlref, struct sockaddr_ctl *sac, @@ -66,14 +123,19 @@ static errno_t utun_ctl_getopt(kern_ctl_ref kctlref, u_int32_t unit, void *uniti int opt, void *data, size_t *len); static errno_t utun_ctl_setopt(kern_ctl_ref kctlref, u_int32_t unit, void *unitinfo, int opt, void *data, size_t len); +static void utun_ctl_rcvd(kern_ctl_ref kctlref, u_int32_t unit, void *unitinfo, + int flags); /* Network Interface functions */ +#if !UTUN_NEXUS +static void utun_start(ifnet_t interface); +static errno_t utun_framer(ifnet_t interface, mbuf_t *packet, + const struct sockaddr *dest, const char *desk_linkaddr, + const char *frame_type, u_int32_t *prepend_len, u_int32_t *postpend_len); +#endif // !UTUN_NEXUS static errno_t utun_output(ifnet_t interface, mbuf_t data); static errno_t utun_demux(ifnet_t interface, mbuf_t data, char *frame_header, protocol_family_t *protocol); -static errno_t utun_framer(ifnet_t interface, mbuf_t *packet, - const struct sockaddr *dest, const char *desk_linkaddr, - const char *frame_type); static errno_t utun_add_proto(ifnet_t interface, protocol_family_t protocol, const struct ifnet_demux_desc *demux_array, u_int32_t demux_count); @@ -88,51 +150,1158 @@ static errno_t utun_proto_input(ifnet_t interface, protocol_family_t protocol, static errno_t utun_proto_pre_output(ifnet_t interface, protocol_family_t protocol, mbuf_t *packet, const struct sockaddr *dest, void *route, char *frame_type, char *link_layer_dest); +static errno_t utun_pkt_input (struct utun_pcb *pcb, mbuf_t m); -/* Control block allocated for each kernel control connection */ -struct utun_pcb { - kern_ctl_ref utun_ctlref; - ifnet_t utun_ifp; - u_int32_t utun_unit; - u_int32_t utun_flags; - int utun_ext_ifdata_stats; -}; +#if UTUN_NEXUS + +#define UTUN_IF_DEFAULT_SLOT_SIZE 4096 +#define UTUN_IF_DEFAULT_RING_SIZE 64 +#define UTUN_IF_DEFAULT_TX_FSW_RING_SIZE 64 +#define UTUN_IF_DEFAULT_RX_FSW_RING_SIZE 128 +#define UTUN_IF_HEADROOM_SIZE 32 + +#define UTUN_IF_MIN_RING_SIZE 16 +#define UTUN_IF_MAX_RING_SIZE 1024 + +static int sysctl_if_utun_ring_size SYSCTL_HANDLER_ARGS; +static int sysctl_if_utun_tx_fsw_ring_size SYSCTL_HANDLER_ARGS; +static int sysctl_if_utun_rx_fsw_ring_size SYSCTL_HANDLER_ARGS; + +static int if_utun_ring_size = UTUN_IF_DEFAULT_RING_SIZE; +static int if_utun_tx_fsw_ring_size = UTUN_IF_DEFAULT_TX_FSW_RING_SIZE; +static int if_utun_rx_fsw_ring_size = UTUN_IF_DEFAULT_RX_FSW_RING_SIZE; + +SYSCTL_DECL(_net_utun); +SYSCTL_NODE(_net, OID_AUTO, utun, CTLFLAG_RW | CTLFLAG_LOCKED, 0, "UTun"); + +SYSCTL_PROC(_net_utun, OID_AUTO, ring_size, CTLTYPE_INT | CTLFLAG_LOCKED | CTLFLAG_RW, + &if_utun_ring_size, UTUN_IF_DEFAULT_RING_SIZE, &sysctl_if_utun_ring_size, "I", ""); +SYSCTL_PROC(_net_utun, OID_AUTO, tx_fsw_ring_size, CTLTYPE_INT | CTLFLAG_LOCKED | CTLFLAG_RW, + &if_utun_tx_fsw_ring_size, UTUN_IF_DEFAULT_TX_FSW_RING_SIZE, &sysctl_if_utun_tx_fsw_ring_size, "I", ""); +SYSCTL_PROC(_net_utun, OID_AUTO, rx_fsw_ring_size, CTLTYPE_INT | CTLFLAG_LOCKED | CTLFLAG_RW, + &if_utun_rx_fsw_ring_size, UTUN_IF_DEFAULT_RX_FSW_RING_SIZE, &sysctl_if_utun_rx_fsw_ring_size, "I", ""); + +static errno_t +utun_register_nexus(void); + +static errno_t +utun_netif_prepare(__unused kern_nexus_t nexus, ifnet_t ifp); +static errno_t +utun_nexus_pre_connect(kern_nexus_provider_t nxprov, + proc_t p, kern_nexus_t nexus, + nexus_port_t nexus_port, kern_channel_t channel, void **ch_ctx); +static errno_t +utun_nexus_connected(kern_nexus_provider_t nxprov, kern_nexus_t nexus, + kern_channel_t channel); +static void +utun_netif_pre_disconnect(kern_nexus_provider_t nxprov, kern_nexus_t nexus, + kern_channel_t channel); +static void +utun_nexus_pre_disconnect(kern_nexus_provider_t nxprov, kern_nexus_t nexus, + kern_channel_t channel); +static void +utun_nexus_disconnected(kern_nexus_provider_t nxprov, kern_nexus_t nexus, + kern_channel_t channel); +static errno_t +utun_kpipe_ring_init(kern_nexus_provider_t nxprov, kern_nexus_t nexus, + kern_channel_t channel, kern_channel_ring_t ring, boolean_t is_tx_ring, + void **ring_ctx); +static void +utun_kpipe_ring_fini(kern_nexus_provider_t nxprov, kern_nexus_t nexus, + kern_channel_ring_t ring); +static errno_t +utun_kpipe_sync_tx(kern_nexus_provider_t nxprov, kern_nexus_t nexus, + kern_channel_ring_t ring, uint32_t flags); +static errno_t +utun_kpipe_sync_rx(kern_nexus_provider_t nxprov, kern_nexus_t nexus, + kern_channel_ring_t ring, uint32_t flags); +#endif // UTUN_NEXUS + +#define UTUN_DEFAULT_MTU 1500 +#define UTUN_HEADER_SIZE(_pcb) (sizeof(u_int32_t) + (((_pcb)->utun_flags & UTUN_FLAGS_ENABLE_PROC_UUID) ? sizeof(uuid_t) : 0)) + +static kern_ctl_ref utun_kctlref; +static u_int32_t utun_family; +static lck_attr_t *utun_lck_attr; +static lck_grp_attr_t *utun_lck_grp_attr; +static lck_grp_t *utun_lck_grp; +static lck_mtx_t utun_lock; + +TAILQ_HEAD(utun_list, utun_pcb) utun_head; + +#define UTUN_PCB_ZONE_MAX 32 +#define UTUN_PCB_ZONE_NAME "net.if_utun" + +static unsigned int utun_pcb_size; /* size of zone element */ +static struct zone *utun_pcb_zone; /* zone for utun_pcb */ + +#if UTUN_NEXUS + +static int +sysctl_if_utun_ring_size SYSCTL_HANDLER_ARGS +{ +#pragma unused(arg1, arg2) + int value = if_utun_ring_size; + + int error = sysctl_handle_int(oidp, &value, 0, req); + if (error || !req->newptr) { + return (error); + } + + if (value < UTUN_IF_MIN_RING_SIZE || + value > UTUN_IF_MAX_RING_SIZE) { + return (EINVAL); + } + + if_utun_ring_size = value; + + return (0); +} + +static int +sysctl_if_utun_tx_fsw_ring_size SYSCTL_HANDLER_ARGS +{ +#pragma unused(arg1, arg2) + int value = if_utun_tx_fsw_ring_size; + + int error = sysctl_handle_int(oidp, &value, 0, req); + if (error || !req->newptr) { + return (error); + } + + if (value < UTUN_IF_MIN_RING_SIZE || + value > UTUN_IF_MAX_RING_SIZE) { + return (EINVAL); + } + + if_utun_tx_fsw_ring_size = value; + + return (0); +} + +static int +sysctl_if_utun_rx_fsw_ring_size SYSCTL_HANDLER_ARGS +{ +#pragma unused(arg1, arg2) + int value = if_utun_rx_fsw_ring_size; + + int error = sysctl_handle_int(oidp, &value, 0, req); + if (error || !req->newptr) { + return (error); + } + + if (value < UTUN_IF_MIN_RING_SIZE || + value > UTUN_IF_MAX_RING_SIZE) { + return (EINVAL); + } + + if_utun_rx_fsw_ring_size = value; + + return (0); +} + +static errno_t +utun_netif_ring_init(kern_nexus_provider_t nxprov, kern_nexus_t nexus, + kern_channel_t channel, kern_channel_ring_t ring, boolean_t is_tx_ring, + void **ring_ctx) +{ +#pragma unused(nxprov) +#pragma unused(channel) +#pragma unused(ring_ctx) + struct utun_pcb *pcb = kern_nexus_get_context(nexus); + if (!is_tx_ring) { + VERIFY(pcb->utun_netif_rxring == NULL); + pcb->utun_netif_rxring = ring; + } else { + VERIFY(pcb->utun_netif_txring == NULL); + pcb->utun_netif_txring = ring; + } + return 0; +} + +static void +utun_netif_ring_fini(kern_nexus_provider_t nxprov, kern_nexus_t nexus, + kern_channel_ring_t ring) +{ +#pragma unused(nxprov) + struct utun_pcb *pcb = kern_nexus_get_context(nexus); + if (pcb->utun_netif_rxring == ring) { + pcb->utun_netif_rxring = NULL; + } else if (pcb->utun_netif_txring == ring) { + pcb->utun_netif_txring = NULL; + } +} + +static errno_t +utun_netif_sync_tx(kern_nexus_provider_t nxprov, kern_nexus_t nexus, + kern_channel_ring_t tx_ring, uint32_t flags) +{ +#pragma unused(nxprov) +#pragma unused(flags) + struct utun_pcb *pcb = kern_nexus_get_context(nexus); + + struct netif_stats *nifs = &NX_NETIF_PRIVATE(nexus)->nif_stats; + + lck_rw_lock_shared(&pcb->utun_pcb_lock); + + struct kern_channel_ring_stat_increment tx_ring_stats; + bzero(&tx_ring_stats, sizeof(tx_ring_stats)); + kern_channel_slot_t tx_pslot = NULL; + kern_channel_slot_t tx_slot = kern_channel_get_next_slot(tx_ring, NULL, NULL); + + STATS_INC(nifs, NETIF_STATS_TXSYNC); + + if (tx_slot == NULL) { + // Nothing to write, don't bother signalling + lck_rw_unlock_shared(&pcb->utun_pcb_lock); + return 0; + } + + if (pcb->utun_kpipe_enabled) { + kern_channel_ring_t rx_ring = pcb->utun_kpipe_rxring; + lck_rw_unlock_shared(&pcb->utun_pcb_lock); + + // Signal the kernel pipe ring to read + if (rx_ring != NULL) { + kern_channel_notify(rx_ring, 0); + } + return 0; + } + + // If we're here, we're injecting into the utun kernel control socket + while (tx_slot != NULL) { + size_t length = 0; + mbuf_t data = NULL; + + kern_packet_t tx_ph = kern_channel_slot_get_packet(tx_ring, tx_slot); + + if (tx_ph == 0) { + // Advance TX ring + tx_pslot = tx_slot; + tx_slot = kern_channel_get_next_slot(tx_ring, tx_slot, NULL); + continue; + } + (void) kern_channel_slot_detach_packet(tx_ring, tx_slot, tx_ph); + + // Advance TX ring + tx_pslot = tx_slot; + tx_slot = kern_channel_get_next_slot(tx_ring, tx_slot, NULL); + + kern_buflet_t tx_buf = kern_packet_get_next_buflet(tx_ph, NULL); + VERIFY(tx_buf != NULL); + + /* tx_baddr is the absolute buffer address */ + uint8_t *tx_baddr = kern_buflet_get_object_address(tx_buf); + VERIFY(tx_baddr != 0); + + bpf_tap_packet_out(pcb->utun_ifp, DLT_RAW, tx_ph, NULL, 0); + + uint16_t tx_offset = kern_buflet_get_data_offset(tx_buf); + uint32_t tx_length = kern_buflet_get_data_length(tx_buf); + + // The offset must be large enough for the headers + VERIFY(tx_offset >= UTUN_HEADER_SIZE(pcb)); + + // Find family + uint32_t af = 0; + uint8_t vhl = *(uint8_t *)(tx_baddr + tx_offset); + u_int ip_version = (vhl >> 4); + switch (ip_version) { + case 4: { + af = AF_INET; + break; + } + case 6: { + af = AF_INET6; + break; + } + default: { + printf("utun_netif_sync_tx %s: unknown ip version %u vhl %u tx_offset %u len %u header_size %zu\n", + pcb->utun_ifp->if_xname, ip_version, vhl, tx_offset, tx_length, + UTUN_HEADER_SIZE(pcb)); + break; + } + } + + tx_offset -= UTUN_HEADER_SIZE(pcb); + tx_length += UTUN_HEADER_SIZE(pcb); + tx_baddr += tx_offset; + + length = MIN(tx_length, UTUN_IF_DEFAULT_SLOT_SIZE); + + // Copy in family + memcpy(tx_baddr, &af, sizeof(af)); + if (pcb->utun_flags & UTUN_FLAGS_ENABLE_PROC_UUID) { + kern_packet_get_euuid(tx_ph, (void *)(tx_baddr + sizeof(af))); + } + + if (length > 0) { + errno_t error = mbuf_gethdr(MBUF_DONTWAIT, MBUF_TYPE_HEADER, &data); + if (error == 0) { + error = mbuf_copyback(data, 0, length, tx_baddr, MBUF_DONTWAIT); + if (error == 0) { + error = utun_output(pcb->utun_ifp, data); + if (error != 0) { + printf("utun_netif_sync_tx %s - utun_output error %d\n", pcb->utun_ifp->if_xname, error); + } + } else { + printf("utun_netif_sync_tx %s - mbuf_copyback(%zu) error %d\n", pcb->utun_ifp->if_xname, length, error); + STATS_INC(nifs, NETIF_STATS_NOMEM_MBUF); + STATS_INC(nifs, NETIF_STATS_DROPPED); + mbuf_freem(data); + data = NULL; + } + } else { + printf("utun_netif_sync_tx %s - mbuf_gethdr error %d\n", pcb->utun_ifp->if_xname, error); + STATS_INC(nifs, NETIF_STATS_NOMEM_MBUF); + STATS_INC(nifs, NETIF_STATS_DROPPED); + } + } else { + printf("utun_netif_sync_tx %s - 0 length packet\n", pcb->utun_ifp->if_xname); + STATS_INC(nifs, NETIF_STATS_NOMEM_MBUF); + STATS_INC(nifs, NETIF_STATS_DROPPED); + } + + kern_pbufpool_free(tx_ring->ckr_pp, tx_ph); + + if (data == NULL) { + continue; + } + + STATS_INC(nifs, NETIF_STATS_TXPKTS); + STATS_INC(nifs, NETIF_STATS_TXCOPY_MBUF); + + tx_ring_stats.kcrsi_slots_transferred++; + tx_ring_stats.kcrsi_bytes_transferred += length; + } + + if (tx_pslot) { + kern_channel_advance_slot(tx_ring, tx_pslot); + kern_channel_increment_ring_net_stats(tx_ring, pcb->utun_ifp, &tx_ring_stats); + (void)kern_channel_reclaim(tx_ring); + } + + lck_rw_unlock_shared(&pcb->utun_pcb_lock); + + return 0; +} + +static errno_t +utun_netif_tx_doorbell(kern_nexus_provider_t nxprov, kern_nexus_t nexus, + kern_channel_ring_t ring, __unused uint32_t flags) +{ +#pragma unused(nxprov) + struct utun_pcb *pcb = kern_nexus_get_context(nexus); + + lck_rw_lock_shared(&pcb->utun_pcb_lock); + + boolean_t more = false; + errno_t rc = 0; + do { + /* Refill and sync the ring */ + rc = kern_channel_tx_refill(ring, UINT32_MAX, UINT32_MAX, true, &more); + if (rc != 0 && rc != EAGAIN && rc != EBUSY) { + printf("%s, tx refill failed %d\n", __func__, rc); + } + } while ((rc == 0) && more); + + if (pcb->utun_kpipe_enabled && !pcb->utun_output_disabled) { + uint32_t tx_available = kern_channel_available_slot_count(ring); + if (pcb->utun_netif_txring_size > 0 && + tx_available >= pcb->utun_netif_txring_size - 1) { + // No room left in tx ring, disable output for now + errno_t error = ifnet_disable_output(pcb->utun_ifp); + if (error != 0) { + printf("utun_netif_tx_doorbell: ifnet_disable_output returned error %d\n", error); + } else { + pcb->utun_output_disabled = true; + } + } + } + + if (pcb->utun_kpipe_enabled && + (((rc != 0) && (rc != EAGAIN)) || pcb->utun_output_disabled)) { + kern_channel_ring_t rx_ring = pcb->utun_kpipe_rxring; + + // Unlock while calling notify + lck_rw_unlock_shared(&pcb->utun_pcb_lock); + // Signal the kernel pipe ring to read + if (rx_ring != NULL) { + kern_channel_notify(rx_ring, 0); + } + } else { + lck_rw_unlock_shared(&pcb->utun_pcb_lock); + } + + return (0); +} + +static errno_t +utun_netif_sync_rx(kern_nexus_provider_t nxprov, kern_nexus_t nexus, + kern_channel_ring_t rx_ring, uint32_t flags) +{ +#pragma unused(nxprov) +#pragma unused(flags) + struct utun_pcb *pcb = kern_nexus_get_context(nexus); + struct kern_channel_ring_stat_increment rx_ring_stats; + + struct netif_stats *nifs = &NX_NETIF_PRIVATE(nexus)->nif_stats; + + lck_rw_lock_shared(&pcb->utun_pcb_lock); + + // Reclaim user-released slots + (void) kern_channel_reclaim(rx_ring); + + STATS_INC(nifs, NETIF_STATS_RXSYNC); + + uint32_t avail = kern_channel_available_slot_count(rx_ring); + if (avail == 0) { + lck_rw_unlock_shared(&pcb->utun_pcb_lock); + return 0; + } + + struct kern_pbufpool *rx_pp = rx_ring->ckr_pp; + VERIFY(rx_pp != NULL); + bzero(&rx_ring_stats, sizeof(rx_ring_stats)); + kern_channel_slot_t rx_pslot = NULL; + kern_channel_slot_t rx_slot = kern_channel_get_next_slot(rx_ring, NULL, NULL); + + while (rx_slot != NULL) { + // Check for a waiting packet + lck_mtx_lock(&pcb->utun_input_chain_lock); + mbuf_t data = pcb->utun_input_chain; + if (data == NULL) { + lck_mtx_unlock(&pcb->utun_input_chain_lock); + break; + } + + // Allocate rx packet + kern_packet_t rx_ph = 0; + errno_t error = kern_pbufpool_alloc_nosleep(rx_pp, 1, &rx_ph); + if (unlikely(error != 0)) { + STATS_INC(nifs, NETIF_STATS_NOMEM_PKT); + STATS_INC(nifs, NETIF_STATS_DROPPED); + printf("utun_netif_sync_rx %s: failed to allocate packet\n", + pcb->utun_ifp->if_xname); + lck_mtx_unlock(&pcb->utun_input_chain_lock); + break; + } + + // Advance waiting packets + pcb->utun_input_chain = data->m_nextpkt; + data->m_nextpkt = NULL; + if (pcb->utun_input_chain == NULL) { + pcb->utun_input_chain_last = NULL; + } + lck_mtx_unlock(&pcb->utun_input_chain_lock); + + size_t header_offset = UTUN_HEADER_SIZE(pcb); + size_t length = mbuf_pkthdr_len(data); + + if (length < header_offset) { + // mbuf is too small + mbuf_freem(data); + kern_pbufpool_free(rx_pp, rx_ph); + STATS_INC(nifs, NETIF_STATS_BADLEN); + STATS_INC(nifs, NETIF_STATS_DROPPED); + printf("utun_netif_sync_rx %s: legacy packet length too short for header %zu < %zu\n", + pcb->utun_ifp->if_xname, length, header_offset); + continue; + } + + length -= header_offset; + if (length > rx_pp->pp_buflet_size) { + // Flush data + mbuf_freem(data); + kern_pbufpool_free(rx_pp, rx_ph); + STATS_INC(nifs, NETIF_STATS_BADLEN); + STATS_INC(nifs, NETIF_STATS_DROPPED); + printf("utun_netif_sync_rx %s: legacy packet length %zu > %u\n", + pcb->utun_ifp->if_xname, length, rx_pp->pp_buflet_size); + continue; + } + + mbuf_pkthdr_setrcvif(data, pcb->utun_ifp); + + // Fillout rx packet + kern_buflet_t rx_buf = kern_packet_get_next_buflet(rx_ph, NULL); + VERIFY(rx_buf != NULL); + void *rx_baddr = kern_buflet_get_object_address(rx_buf); + VERIFY(rx_baddr != NULL); + + // Copy-in data from mbuf to buflet + mbuf_copydata(data, header_offset, length, (void *)rx_baddr); + kern_packet_clear_flow_uuid(rx_ph); // Zero flow id + + // Finalize and attach the packet + error = kern_buflet_set_data_offset(rx_buf, 0); + VERIFY(error == 0); + error = kern_buflet_set_data_length(rx_buf, length); + VERIFY(error == 0); + error = kern_packet_set_link_header_offset(rx_ph, 0); + VERIFY(error == 0); + error = kern_packet_set_network_header_offset(rx_ph, 0); + VERIFY(error == 0); + error = kern_packet_finalize(rx_ph); + VERIFY(error == 0); + error = kern_channel_slot_attach_packet(rx_ring, rx_slot, rx_ph); + VERIFY(error == 0); + + STATS_INC(nifs, NETIF_STATS_RXPKTS); + STATS_INC(nifs, NETIF_STATS_RXCOPY_MBUF); + bpf_tap_packet_in(pcb->utun_ifp, DLT_RAW, rx_ph, NULL, 0); + + rx_ring_stats.kcrsi_slots_transferred++; + rx_ring_stats.kcrsi_bytes_transferred += length; + + mbuf_freem(data); + + // Advance ring + rx_pslot = rx_slot; + rx_slot = kern_channel_get_next_slot(rx_ring, rx_slot, NULL); + } + + struct kern_channel_ring_stat_increment tx_ring_stats; + bzero(&tx_ring_stats, sizeof(tx_ring_stats)); + kern_channel_ring_t tx_ring = pcb->utun_kpipe_txring; + kern_channel_slot_t tx_pslot = NULL; + kern_channel_slot_t tx_slot = NULL; + if (tx_ring == NULL) { + // Net-If TX ring not set up yet, nothing to read + goto done; + } + + // Unlock utun before entering ring + lck_rw_unlock_shared(&pcb->utun_pcb_lock); + + (void)kr_enter(tx_ring, TRUE); + + // Lock again after entering and validate + lck_rw_lock_shared(&pcb->utun_pcb_lock); + if (tx_ring != pcb->utun_kpipe_txring) { + goto done; + } + + tx_slot = kern_channel_get_next_slot(tx_ring, NULL, NULL); + if (tx_slot == NULL) { + // Nothing to read, don't bother signalling + goto done; + } + + while (rx_slot != NULL && tx_slot != NULL) { + // Allocate rx packet + kern_packet_t rx_ph = 0; + kern_packet_t tx_ph = kern_channel_slot_get_packet(tx_ring, tx_slot); + + // Advance TX ring + tx_pslot = tx_slot; + tx_slot = kern_channel_get_next_slot(tx_ring, tx_slot, NULL); + + /* Skip slot if packet is zero-length or marked as dropped (QUMF_DROPPED) */ + if (tx_ph == 0) { + continue; + } + + errno_t error = kern_pbufpool_alloc_nosleep(rx_pp, 1, &rx_ph); + if (unlikely(error != 0)) { + STATS_INC(nifs, NETIF_STATS_NOMEM_PKT); + STATS_INC(nifs, NETIF_STATS_DROPPED); + printf("utun_netif_sync_rx %s: failed to allocate packet\n", + pcb->utun_ifp->if_xname); + break; + } + + kern_buflet_t tx_buf = kern_packet_get_next_buflet(tx_ph, NULL); + VERIFY(tx_buf != NULL); + uint8_t *tx_baddr = kern_buflet_get_object_address(tx_buf); + VERIFY(tx_baddr != 0); + tx_baddr += kern_buflet_get_data_offset(tx_buf); + + // Check packet length + size_t header_offset = UTUN_HEADER_SIZE(pcb); + uint32_t tx_length = kern_packet_get_data_length(tx_ph); + if (tx_length < header_offset) { + // Packet is too small + kern_pbufpool_free(rx_pp, rx_ph); + STATS_INC(nifs, NETIF_STATS_BADLEN); + STATS_INC(nifs, NETIF_STATS_DROPPED); + printf("utun_netif_sync_rx %s: packet length too short for header %u < %zu\n", + pcb->utun_ifp->if_xname, tx_length, header_offset); + continue; + } + + size_t length = MIN(tx_length - header_offset, + UTUN_IF_DEFAULT_SLOT_SIZE); + + tx_ring_stats.kcrsi_slots_transferred++; + tx_ring_stats.kcrsi_bytes_transferred += length; + + // Fillout rx packet + kern_buflet_t rx_buf = kern_packet_get_next_buflet(rx_ph, NULL); + VERIFY(rx_buf != NULL); + void *rx_baddr = kern_buflet_get_object_address(rx_buf); + VERIFY(rx_baddr != NULL); + + // Copy-in data from tx to rx + memcpy((void *)rx_baddr, (void *)(tx_baddr + header_offset), length); + kern_packet_clear_flow_uuid(rx_ph); // Zero flow id + + // Finalize and attach the packet + error = kern_buflet_set_data_offset(rx_buf, 0); + VERIFY(error == 0); + error = kern_buflet_set_data_length(rx_buf, length); + VERIFY(error == 0); + error = kern_packet_set_link_header_offset(rx_ph, 0); + VERIFY(error == 0); + error = kern_packet_set_network_header_offset(rx_ph, 0); + VERIFY(error == 0); + error = kern_packet_finalize(rx_ph); + VERIFY(error == 0); + error = kern_channel_slot_attach_packet(rx_ring, rx_slot, rx_ph); + VERIFY(error == 0); + + STATS_INC(nifs, NETIF_STATS_RXPKTS); + STATS_INC(nifs, NETIF_STATS_RXCOPY_DIRECT); + bpf_tap_packet_in(pcb->utun_ifp, DLT_RAW, rx_ph, NULL, 0); + + rx_ring_stats.kcrsi_slots_transferred++; + rx_ring_stats.kcrsi_bytes_transferred += length; + + rx_pslot = rx_slot; + rx_slot = kern_channel_get_next_slot(rx_ring, rx_slot, NULL); + } + +done: + if (rx_pslot) { + kern_channel_advance_slot(rx_ring, rx_pslot); + kern_channel_increment_ring_net_stats(rx_ring, pcb->utun_ifp, &rx_ring_stats); + } + + if (tx_pslot) { + kern_channel_advance_slot(tx_ring, tx_pslot); + kern_channel_increment_ring_net_stats(tx_ring, pcb->utun_ifp, &tx_ring_stats); + (void)kern_channel_reclaim(tx_ring); + } + + // Unlock first, then exit ring + lck_rw_unlock_shared(&pcb->utun_pcb_lock); + if (tx_ring != NULL) { + if (tx_pslot != NULL) { + kern_channel_notify(tx_ring, 0); + } + kr_exit(tx_ring); + } + + return 0; +} + +static errno_t +utun_nexus_ifattach(struct utun_pcb *pcb, + struct ifnet_init_eparams *init_params, + struct ifnet **ifp) +{ + errno_t err; + nexus_controller_t controller = kern_nexus_shared_controller(); + struct kern_nexus_net_init net_init; + + nexus_name_t provider_name; + snprintf((char *)provider_name, sizeof(provider_name), + "com.apple.netif.utun%d", pcb->utun_unit); + + struct kern_nexus_provider_init prov_init = { + .nxpi_version = KERN_NEXUS_DOMAIN_PROVIDER_CURRENT_VERSION, + .nxpi_flags = NXPIF_VIRTUAL_DEVICE, + .nxpi_pre_connect = utun_nexus_pre_connect, + .nxpi_connected = utun_nexus_connected, + .nxpi_pre_disconnect = utun_netif_pre_disconnect, + .nxpi_disconnected = utun_nexus_disconnected, + .nxpi_ring_init = utun_netif_ring_init, + .nxpi_ring_fini = utun_netif_ring_fini, + .nxpi_slot_init = NULL, + .nxpi_slot_fini = NULL, + .nxpi_sync_tx = utun_netif_sync_tx, + .nxpi_sync_rx = utun_netif_sync_rx, + .nxpi_tx_doorbell = utun_netif_tx_doorbell, + }; + + nexus_attr_t nxa = NULL; + err = kern_nexus_attr_create(&nxa); + if (err != 0) { + printf("%s: kern_nexus_attr_create failed: %d\n", + __func__, err); + goto failed; + } + + uint64_t slot_buffer_size = UTUN_IF_DEFAULT_SLOT_SIZE; + err = kern_nexus_attr_set(nxa, NEXUS_ATTR_SLOT_BUF_SIZE, slot_buffer_size); + VERIFY(err == 0); + + // Reset ring size for netif nexus to limit memory usage + uint64_t ring_size = if_utun_ring_size; + err = kern_nexus_attr_set(nxa, NEXUS_ATTR_TX_SLOTS, ring_size); + VERIFY(err == 0); + err = kern_nexus_attr_set(nxa, NEXUS_ATTR_RX_SLOTS, ring_size); + VERIFY(err == 0); + + pcb->utun_netif_txring_size = ring_size; + + err = kern_nexus_controller_register_provider(controller, + utun_nx_dom_prov, + provider_name, + &prov_init, + sizeof(prov_init), + nxa, + &pcb->utun_nx.if_provider); + if (err != 0) { + printf("%s register provider failed, error %d\n", + __func__, err); + goto failed; + } + + bzero(&net_init, sizeof(net_init)); + net_init.nxneti_version = KERN_NEXUS_NET_CURRENT_VERSION; + net_init.nxneti_flags = 0; + net_init.nxneti_eparams = init_params; + net_init.nxneti_lladdr = NULL; + net_init.nxneti_prepare = utun_netif_prepare; + err = kern_nexus_controller_alloc_net_provider_instance(controller, + pcb->utun_nx.if_provider, + pcb, + &pcb->utun_nx.if_instance, + &net_init, + ifp); + if (err != 0) { + printf("%s alloc_net_provider_instance failed, %d\n", + __func__, err); + kern_nexus_controller_deregister_provider(controller, + pcb->utun_nx.if_provider); + uuid_clear(pcb->utun_nx.if_provider); + goto failed; + } + +failed: + if (nxa) { + kern_nexus_attr_destroy(nxa); + } + return (err); +} + +static void +utun_detach_provider_and_instance(uuid_t provider, uuid_t instance) +{ + nexus_controller_t controller = kern_nexus_shared_controller(); + errno_t err; + + if (!uuid_is_null(instance)) { + err = kern_nexus_controller_free_provider_instance(controller, + instance); + if (err != 0) { + printf("%s free_provider_instance failed %d\n", + __func__, err); + } + uuid_clear(instance); + } + if (!uuid_is_null(provider)) { + err = kern_nexus_controller_deregister_provider(controller, + provider); + if (err != 0) { + printf("%s deregister_provider %d\n", __func__, err); + } + uuid_clear(provider); + } + return; +} + +static void +utun_nexus_detach(utun_nx_t nx) +{ + nexus_controller_t controller = kern_nexus_shared_controller(); + errno_t err; + + if (!uuid_is_null(nx->ms_host)) { + err = kern_nexus_ifdetach(controller, + nx->ms_instance, + nx->ms_host); + if (err != 0) { + printf("%s: kern_nexus_ifdetach ms host failed %d\n", + __func__, err); + } + } + + if (!uuid_is_null(nx->ms_device)) { + err = kern_nexus_ifdetach(controller, + nx->ms_instance, + nx->ms_device); + if (err != 0) { + printf("%s: kern_nexus_ifdetach ms device failed %d\n", + __func__, err); + } + } + + utun_detach_provider_and_instance(nx->if_provider, + nx->if_instance); + utun_detach_provider_and_instance(nx->ms_provider, + nx->ms_instance); + + memset(nx, 0, sizeof(*nx)); +} + +static errno_t +utun_create_fs_provider_and_instance(uint32_t subtype, const char *type_name, + const char *ifname, + uuid_t *provider, uuid_t *instance) +{ + nexus_attr_t attr = NULL; + nexus_controller_t controller = kern_nexus_shared_controller(); + uuid_t dom_prov; + errno_t err; + struct kern_nexus_init init; + nexus_name_t provider_name; + + err = kern_nexus_get_builtin_domain_provider(NEXUS_TYPE_FLOW_SWITCH, + &dom_prov); + if (err != 0) { + printf("%s can't get %s provider, error %d\n", + __func__, type_name, err); + goto failed; + } + + err = kern_nexus_attr_create(&attr); + if (err != 0) { + printf("%s: kern_nexus_attr_create failed: %d\n", + __func__, err); + goto failed; + } + + err = kern_nexus_attr_set(attr, NEXUS_ATTR_EXTENSIONS, subtype); + VERIFY(err == 0); + + uint64_t slot_buffer_size = UTUN_IF_DEFAULT_SLOT_SIZE; + err = kern_nexus_attr_set(attr, NEXUS_ATTR_SLOT_BUF_SIZE, slot_buffer_size); + VERIFY(err == 0); + + // Reset ring size for flowswitch nexus to limit memory usage. Larger RX than netif. + uint64_t tx_ring_size = if_utun_tx_fsw_ring_size; + err = kern_nexus_attr_set(attr, NEXUS_ATTR_TX_SLOTS, tx_ring_size); + VERIFY(err == 0); + uint64_t rx_ring_size = if_utun_rx_fsw_ring_size; + err = kern_nexus_attr_set(attr, NEXUS_ATTR_RX_SLOTS, rx_ring_size); + VERIFY(err == 0); + + snprintf((char *)provider_name, sizeof(provider_name), + "com.apple.%s.%s", type_name, ifname); + err = kern_nexus_controller_register_provider(controller, + dom_prov, + provider_name, + NULL, + 0, + attr, + provider); + kern_nexus_attr_destroy(attr); + attr = NULL; + if (err != 0) { + printf("%s register %s provider failed, error %d\n", + __func__, type_name, err); + goto failed; + } + bzero(&init, sizeof (init)); + init.nxi_version = KERN_NEXUS_CURRENT_VERSION; + err = kern_nexus_controller_alloc_provider_instance(controller, + *provider, + NULL, + instance, &init); + if (err != 0) { + printf("%s alloc_provider_instance %s failed, %d\n", + __func__, type_name, err); + kern_nexus_controller_deregister_provider(controller, + *provider); + uuid_clear(*provider); + } +failed: + return (err); +} + +static errno_t +utun_multistack_attach(struct utun_pcb *pcb) +{ + nexus_controller_t controller = kern_nexus_shared_controller(); + errno_t err = 0; + utun_nx_t nx = &pcb->utun_nx; + + // Allocate multistack flowswitch + err = utun_create_fs_provider_and_instance(NEXUS_EXTENSION_FSW_TYPE_MULTISTACK, + "multistack", + pcb->utun_ifp->if_xname, + &nx->ms_provider, + &nx->ms_instance); + if (err != 0) { + printf("%s: failed to create bridge provider and instance\n", + __func__); + goto failed; + } + + // Attach multistack to device port + err = kern_nexus_ifattach(controller, nx->ms_instance, + NULL, nx->if_instance, + FALSE, &nx->ms_device); + if (err != 0) { + printf("%s kern_nexus_ifattach ms device %d\n", __func__, err); + goto failed; + } + + // Attach multistack to host port + err = kern_nexus_ifattach(controller, nx->ms_instance, + NULL, nx->if_instance, + TRUE, &nx->ms_host); + if (err != 0) { + printf("%s kern_nexus_ifattach ms host %d\n", __func__, err); + goto failed; + } + + // Extract the agent UUID and save for later + struct kern_nexus *multistack_nx = nx_find(nx->ms_instance, false); + if (multistack_nx != NULL) { + struct nx_flowswitch *flowswitch = NX_FSW_PRIVATE(multistack_nx); + if (flowswitch != NULL) { + FSW_RLOCK(flowswitch); + struct fsw_ms_context *ms_context = (struct fsw_ms_context *)flowswitch->fsw_ops_private; + if (ms_context != NULL) { + uuid_copy(nx->ms_agent, ms_context->mc_agent_uuid); + } else { + printf("utun_multistack_attach - fsw_ms_context is NULL\n"); + } + FSW_UNLOCK(flowswitch); + } else { + printf("utun_multistack_attach - flowswitch is NULL\n"); + } + nx_release(multistack_nx); + } else { + printf("utun_multistack_attach - unable to find multistack nexus\n"); + } + + return (0); + +failed: + utun_nexus_detach(nx); + + errno_t detach_error = 0; + if ((detach_error = ifnet_detach(pcb->utun_ifp)) != 0) { + panic("utun_multistack_attach - ifnet_detach failed: %d\n", detach_error); + /* NOT REACHED */ + } + + return (err); +} + +static errno_t +utun_register_kernel_pipe_nexus(void) +{ + nexus_attr_t nxa = NULL; + errno_t result; + + lck_mtx_lock(&utun_lock); + if (utun_ncd_refcount++) { + lck_mtx_unlock(&utun_lock); + return 0; + } + + result = kern_nexus_controller_create(&utun_ncd); + if (result) { + printf("%s: kern_nexus_controller_create failed: %d\n", + __FUNCTION__, result); + goto done; + } + + uuid_t dom_prov; + result = kern_nexus_get_builtin_domain_provider( + NEXUS_TYPE_KERNEL_PIPE, &dom_prov); + if (result) { + printf("%s: kern_nexus_get_builtin_domain_provider failed: %d\n", + __FUNCTION__, result); + goto done; + } + + struct kern_nexus_provider_init prov_init = { + .nxpi_version = KERN_NEXUS_DOMAIN_PROVIDER_CURRENT_VERSION, + .nxpi_flags = NXPIF_VIRTUAL_DEVICE, + .nxpi_pre_connect = utun_nexus_pre_connect, + .nxpi_connected = utun_nexus_connected, + .nxpi_pre_disconnect = utun_nexus_pre_disconnect, + .nxpi_disconnected = utun_nexus_disconnected, + .nxpi_ring_init = utun_kpipe_ring_init, + .nxpi_ring_fini = utun_kpipe_ring_fini, + .nxpi_slot_init = NULL, + .nxpi_slot_fini = NULL, + .nxpi_sync_tx = utun_kpipe_sync_tx, + .nxpi_sync_rx = utun_kpipe_sync_rx, + .nxpi_tx_doorbell = NULL, + }; + + result = kern_nexus_attr_create(&nxa); + if (result) { + printf("%s: kern_nexus_attr_create failed: %d\n", + __FUNCTION__, result); + goto done; + } + + uint64_t slot_buffer_size = UTUN_IF_DEFAULT_SLOT_SIZE; + result = kern_nexus_attr_set(nxa, NEXUS_ATTR_SLOT_BUF_SIZE, slot_buffer_size); + VERIFY(result == 0); + + // Reset ring size for kernel pipe nexus to limit memory usage + uint64_t ring_size = if_utun_ring_size; + result = kern_nexus_attr_set(nxa, NEXUS_ATTR_TX_SLOTS, ring_size); + VERIFY(result == 0); + result = kern_nexus_attr_set(nxa, NEXUS_ATTR_RX_SLOTS, ring_size); + VERIFY(result == 0); + + result = kern_nexus_controller_register_provider(utun_ncd, + dom_prov, + (const uint8_t *)"com.apple.nexus.utun.kpipe", + &prov_init, + sizeof(prov_init), + nxa, + &utun_kpipe_uuid); + if (result) { + printf("%s: kern_nexus_controller_register_provider failed: %d\n", + __FUNCTION__, result); + goto done; + } + +done: + if (nxa) { + kern_nexus_attr_destroy(nxa); + } + + if (result) { + if (utun_ncd) { + kern_nexus_controller_destroy(utun_ncd); + utun_ncd = NULL; + } + utun_ncd_refcount = 0; + } + + lck_mtx_unlock(&utun_lock); + + return result; +} + +static void +utun_unregister_kernel_pipe_nexus(void) +{ + lck_mtx_lock(&utun_lock); + + VERIFY(utun_ncd_refcount > 0); -static kern_ctl_ref utun_kctlref; -static u_int32_t utun_family; -static OSMallocTag utun_malloc_tag; -static SInt32 utun_ifcount = 0; + if (--utun_ncd_refcount == 0) { + kern_nexus_controller_destroy(utun_ncd); + utun_ncd = NULL; + } + + lck_mtx_unlock(&utun_lock); +} -/* Prepend length */ -static void* -utun_alloc(size_t size) +// For use by socket option, not internally +static errno_t +utun_disable_channel(struct utun_pcb *pcb) { - size_t *mem = OSMalloc(size + sizeof(size_t), utun_malloc_tag); - - if (mem) { - *mem = size + sizeof(size_t); - mem++; + errno_t result; + int enabled; + uuid_t uuid; + + lck_rw_lock_exclusive(&pcb->utun_pcb_lock); + + enabled = pcb->utun_kpipe_enabled; + uuid_copy(uuid, pcb->utun_kpipe_uuid); + + VERIFY(uuid_is_null(pcb->utun_kpipe_uuid) == !enabled); + + pcb->utun_kpipe_enabled = 0; + uuid_clear(pcb->utun_kpipe_uuid); + + lck_rw_unlock_exclusive(&pcb->utun_pcb_lock); + + if (enabled) { + result = kern_nexus_controller_free_provider_instance(utun_ncd, uuid); + } else { + result = ENXIO; } - - return (void*)mem; + + if (!result) { + utun_unregister_kernel_pipe_nexus(); + } + + return result; } -static void -utun_free(void *ptr) +static errno_t +utun_enable_channel(struct utun_pcb *pcb, struct proc *proc) { - size_t *size = ptr; - size--; - OSFree(size, *size, utun_malloc_tag); + struct kern_nexus_init init; + errno_t result; + + result = utun_register_kernel_pipe_nexus(); + if (result) { + return result; + } + + VERIFY(utun_ncd); + + lck_rw_lock_exclusive(&pcb->utun_pcb_lock); + + if (pcb->utun_kpipe_enabled) { + result = EEXIST; // return success instead? + goto done; + } + + /* + * Make sure we can fit packets in the channel buffers and + * Allow an extra 4 bytes for the protocol number header in the channel + */ + if (pcb->utun_ifp->if_mtu + UTUN_HEADER_SIZE(pcb) > UTUN_IF_DEFAULT_SLOT_SIZE) { + result = EOPNOTSUPP; + goto done; + } + + VERIFY(uuid_is_null(pcb->utun_kpipe_uuid)); + bzero(&init, sizeof (init)); + init.nxi_version = KERN_NEXUS_CURRENT_VERSION; + result = kern_nexus_controller_alloc_provider_instance(utun_ncd, + utun_kpipe_uuid, pcb, &pcb->utun_kpipe_uuid, &init); + if (result) { + goto done; + } + + nexus_port_t port = NEXUS_PORT_KERNEL_PIPE_CLIENT; + result = kern_nexus_controller_bind_provider_instance(utun_ncd, + pcb->utun_kpipe_uuid, &port, + proc_pid(proc), NULL, NULL, 0, NEXUS_BIND_PID); + if (result) { + kern_nexus_controller_free_provider_instance(utun_ncd, + pcb->utun_kpipe_uuid); + uuid_clear(pcb->utun_kpipe_uuid); + goto done; + } + + pcb->utun_kpipe_enabled = 1; + +done: + lck_rw_unlock_exclusive(&pcb->utun_pcb_lock); + + if (result) { + utun_unregister_kernel_pipe_nexus(); + } + + return result; } +#endif // UTUN_NEXUS + errno_t utun_register_control(void) { - struct kern_ctl_reg kern_ctl; - errno_t result = 0; - - /* Create a tag to allocate memory */ - utun_malloc_tag = OSMalloc_Tagalloc(UTUN_CONTROL_NAME, OSMT_DEFAULT); + struct kern_ctl_reg kern_ctl; + errno_t result = 0; /* Find a unique value for our interface family */ result = mbuf_tag_id_find(UTUN_CONTROL_NAME, &utun_family); @@ -140,19 +1309,35 @@ utun_register_control(void) printf("utun_register_control - mbuf_tag_id_find_internal failed: %d\n", result); return result; } + + utun_pcb_size = sizeof(struct utun_pcb); + utun_pcb_zone = zinit(utun_pcb_size, + UTUN_PCB_ZONE_MAX * utun_pcb_size, + 0, UTUN_PCB_ZONE_NAME); + if (utun_pcb_zone == NULL) { + printf("utun_register_control - zinit(utun_pcb) failed"); + return ENOMEM; + } + +#if UTUN_NEXUS + utun_register_nexus(); +#endif // UTUN_NEXUS + + TAILQ_INIT(&utun_head); bzero(&kern_ctl, sizeof(kern_ctl)); - strncpy(kern_ctl.ctl_name, UTUN_CONTROL_NAME, sizeof(kern_ctl.ctl_name)); + strlcpy(kern_ctl.ctl_name, UTUN_CONTROL_NAME, sizeof(kern_ctl.ctl_name)); kern_ctl.ctl_name[sizeof(kern_ctl.ctl_name) - 1] = 0; - kern_ctl.ctl_flags = CTL_FLAG_PRIVILEGED; /* Require root */ - kern_ctl.ctl_sendsize = 64 * 1024; - kern_ctl.ctl_recvsize = 64 * 1024; + kern_ctl.ctl_flags = CTL_FLAG_PRIVILEGED | CTL_FLAG_REG_EXTENDED; /* Require root */ + kern_ctl.ctl_sendsize = 512 * 1024; + kern_ctl.ctl_recvsize = 512 * 1024; kern_ctl.ctl_connect = utun_ctl_connect; kern_ctl.ctl_disconnect = utun_ctl_disconnect; kern_ctl.ctl_send = utun_ctl_send; kern_ctl.ctl_setopt = utun_ctl_setopt; kern_ctl.ctl_getopt = utun_ctl_getopt; - + kern_ctl.ctl_rcvd = utun_ctl_rcvd; + result = ctl_register(&kern_ctl, &utun_kctlref); if (result != 0) { printf("utun_register_control - ctl_register failed: %d\n", result); @@ -177,61 +1362,152 @@ utun_register_control(void) utun_family, result); return result; } - + + utun_lck_attr = lck_attr_alloc_init(); + utun_lck_grp_attr = lck_grp_attr_alloc_init(); + utun_lck_grp = lck_grp_alloc_init("utun", utun_lck_grp_attr); + +#if UTUN_NEXUS + lck_mtx_init(&utun_lock, utun_lck_grp, utun_lck_attr); +#endif // UTUN_NEXUS + return 0; } /* Kernel control functions */ +static inline void +utun_free_pcb(struct utun_pcb *pcb) +{ +#ifdef UTUN_NEXUS + mbuf_freem_list(pcb->utun_input_chain); + lck_mtx_destroy(&pcb->utun_input_chain_lock, utun_lck_grp); +#endif // UTUN_NEXUS + lck_rw_destroy(&pcb->utun_pcb_lock, utun_lck_grp); + lck_mtx_lock(&utun_lock); + TAILQ_REMOVE(&utun_head, pcb, utun_chain); + lck_mtx_unlock(&utun_lock); + zfree(utun_pcb_zone, pcb); +} + static errno_t -utun_ctl_connect( - kern_ctl_ref kctlref, - struct sockaddr_ctl *sac, - void **unitinfo) +utun_ctl_connect(kern_ctl_ref kctlref, + struct sockaddr_ctl *sac, + void **unitinfo) { - struct ifnet_init_params utun_init; - struct utun_pcb *pcb; - errno_t result; - struct ifnet_stats_param stats; - - /* kernel control allocates, interface frees */ - pcb = utun_alloc(sizeof(*pcb)); - if (pcb == NULL) - return ENOMEM; + struct ifnet_init_eparams utun_init = {}; + errno_t result = 0; - /* Setup the protocol control block */ - bzero(pcb, sizeof(*pcb)); + struct utun_pcb *pcb = zalloc(utun_pcb_zone); + memset(pcb, 0, sizeof(*pcb)); + *unitinfo = pcb; pcb->utun_ctlref = kctlref; pcb->utun_unit = sac->sc_unit; - - printf("utun_ctl_connect: creating interface utun%d\n", pcb->utun_unit - 1); + pcb->utun_max_pending_packets = 1; + + lck_mtx_init(&pcb->utun_input_chain_lock, utun_lck_grp, utun_lck_attr); + lck_rw_init(&pcb->utun_pcb_lock, utun_lck_grp, utun_lck_attr); + + lck_mtx_lock(&utun_lock); + + /* Find some open interface id */ + u_int32_t chosen_unique_id = 1; + struct utun_pcb *next_pcb = TAILQ_LAST(&utun_head, utun_list); + if (next_pcb != NULL) { + /* List was not empty, add one to the last item */ + chosen_unique_id = next_pcb->utun_unique_id + 1; + next_pcb = NULL; + + /* + * If this wrapped the id number, start looking at + * the front of the list for an unused id. + */ + if (chosen_unique_id == 0) { + /* Find the next unused ID */ + chosen_unique_id = 1; + TAILQ_FOREACH(next_pcb, &utun_head, utun_chain) { + if (next_pcb->utun_unique_id > chosen_unique_id) { + /* We found a gap */ + break; + } + + chosen_unique_id = next_pcb->utun_unique_id + 1; + } + } + } + + pcb->utun_unique_id = chosen_unique_id; + + if (next_pcb != NULL) { + TAILQ_INSERT_BEFORE(next_pcb, pcb, utun_chain); + } else { + TAILQ_INSERT_TAIL(&utun_head, pcb, utun_chain); + } + lck_mtx_unlock(&utun_lock); + + snprintf(pcb->utun_if_xname, sizeof(pcb->utun_if_xname), "utun%d", pcb->utun_unit - 1); + snprintf(pcb->utun_unique_name, sizeof(pcb->utun_unique_name), "utunid%d", pcb->utun_unique_id - 1); + printf("utun_ctl_connect: creating interface %s (id %s)\n", pcb->utun_if_xname, pcb->utun_unique_name); /* Create the interface */ bzero(&utun_init, sizeof(utun_init)); + utun_init.ver = IFNET_INIT_CURRENT_VERSION; + utun_init.len = sizeof (utun_init); + +#if UTUN_NEXUS + utun_init.flags = (IFNET_INIT_SKYWALK_NATIVE | IFNET_INIT_NX_NOAUTO); + utun_init.tx_headroom = UTUN_IF_HEADROOM_SIZE; +#else // UTUN_NEXUS + utun_init.flags = IFNET_INIT_NX_NOAUTO; + utun_init.start = utun_start; + utun_init.framer_extended = utun_framer; +#endif // UTUN_NEXUS utun_init.name = "utun"; utun_init.unit = pcb->utun_unit - 1; + utun_init.uniqueid = pcb->utun_unique_name; + utun_init.uniqueid_len = strlen(pcb->utun_unique_name); utun_init.family = utun_family; + utun_init.subfamily = IFNET_SUBFAMILY_UTUN; utun_init.type = IFT_OTHER; - utun_init.output = utun_output; utun_init.demux = utun_demux; - utun_init.framer = utun_framer; utun_init.add_proto = utun_add_proto; utun_init.del_proto = utun_del_proto; utun_init.softc = pcb; utun_init.ioctl = utun_ioctl; utun_init.detach = utun_detached; - - result = ifnet_allocate(&utun_init, &pcb->utun_ifp); + +#if UTUN_NEXUS + result = utun_nexus_ifattach(pcb, &utun_init, &pcb->utun_ifp); + if (result != 0) { + printf("utun_ctl_connect - utun_nexus_ifattach failed: %d\n", result); + utun_free_pcb(pcb); + *unitinfo = NULL; + return result; + } + + result = utun_multistack_attach(pcb); + if (result != 0) { + printf("utun_ctl_connect - utun_multistack_attach failed: %d\n", result); + *unitinfo = NULL; + return result; + } + +#else // UTUN_NEXUS + /* + * Upon success, this holds an ifnet reference which we will + * release via ifnet_release() at final detach time. + */ + result = ifnet_allocate_extended(&utun_init, &pcb->utun_ifp); if (result != 0) { printf("utun_ctl_connect - ifnet_allocate failed: %d\n", result); - utun_free(pcb); + utun_free_pcb(pcb); + *unitinfo = NULL; return result; } - OSIncrementAtomic(&utun_ifcount); /* Set flags and additional information. */ - ifnet_set_mtu(pcb->utun_ifp, 1500); + ifnet_set_mtu(pcb->utun_ifp, UTUN_DEFAULT_MTU); ifnet_set_flags(pcb->utun_ifp, IFF_UP | IFF_MULTICAST | IFF_POINTOPOINT, 0xffff); /* The interface must generate its own IPv6 LinkLocal address, @@ -240,33 +1516,34 @@ utun_ctl_connect( ifnet_set_eflags(pcb->utun_ifp, IFEF_NOAUTOIPV6LL, IFEF_NOAUTOIPV6LL); /* Reset the stats in case as the interface may have been recycled */ + struct ifnet_stats_param stats; bzero(&stats, sizeof(struct ifnet_stats_param)); ifnet_set_stat(pcb->utun_ifp, &stats); /* Attach the interface */ result = ifnet_attach(pcb->utun_ifp, NULL); if (result != 0) { - printf("utun_ctl_connect - ifnet_allocate failed: %d\n", result); + printf("utun_ctl_connect - ifnet_attach failed: %d\n", result); + /* Release reference now since attach failed */ ifnet_release(pcb->utun_ifp); - utun_free(pcb); + utun_free_pcb(pcb); + *unitinfo = NULL; + return (result); } - +#endif // UTUN_NEXUS + /* Attach to bpf */ - if (result == 0) - bpfattach(pcb->utun_ifp, DLT_NULL, 4); - + bpfattach(pcb->utun_ifp, DLT_RAW, 0); /* The interfaces resoures allocated, mark it as running */ - if (result == 0) - ifnet_set_flags(pcb->utun_ifp, IFF_RUNNING, IFF_RUNNING); - + ifnet_set_flags(pcb->utun_ifp, IFF_RUNNING, IFF_RUNNING); + return result; } static errno_t -utun_detach_ip( - ifnet_t interface, - protocol_family_t protocol, - socket_t pf_socket) +utun_detach_ip(ifnet_t interface, + protocol_family_t protocol, + socket_t pf_socket) { errno_t result = EPROTONOSUPPORT; @@ -279,8 +1556,7 @@ utun_detach_ip( ifnet_name(interface), ifnet_unit(interface)); result = sock_ioctl(pf_socket, SIOCPROTODETACH, &ifr); - } - else if (protocol == PF_INET6) { + } else if (protocol == PF_INET6) { struct in6_ifreq ifr6; bzero(&ifr6, sizeof(ifr6)); @@ -294,17 +1570,16 @@ utun_detach_ip( } static void -utun_remove_address( - ifnet_t interface, - protocol_family_t protocol, - ifaddr_t address, - socket_t pf_socket) +utun_remove_address(ifnet_t interface, + protocol_family_t protocol, + ifaddr_t address, + socket_t pf_socket) { errno_t result = 0; /* Attempt a detach */ if (protocol == PF_INET) { - struct ifreq ifr; + struct ifreq ifr; bzero(&ifr, sizeof(ifr)); snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", @@ -312,16 +1587,14 @@ utun_remove_address( result = ifaddr_address(address, &ifr.ifr_addr, sizeof(ifr.ifr_addr)); if (result != 0) { printf("utun_remove_address - ifaddr_address failed: %d", result); - } - else { + } else { result = sock_ioctl(pf_socket, SIOCDIFADDR, &ifr); if (result != 0) { printf("utun_remove_address - SIOCDIFADDR failed: %d", result); } } - } - else if (protocol == PF_INET6) { - struct in6_ifreq ifr6; + } else if (protocol == PF_INET6) { + struct in6_ifreq ifr6; bzero(&ifr6, sizeof(ifr6)); snprintf(ifr6.ifr_name, sizeof(ifr6.ifr_name), "%s%d", @@ -331,8 +1604,7 @@ utun_remove_address( if (result != 0) { printf("utun_remove_address - ifaddr_address failed (v6): %d", result); - } - else { + } else { result = sock_ioctl(pf_socket, SIOCDIFADDR_IN6, &ifr6); if (result != 0) { printf("utun_remove_address - SIOCDIFADDR_IN6 failed: %d", @@ -343,14 +1615,13 @@ utun_remove_address( } static void -utun_cleanup_family( - ifnet_t interface, - protocol_family_t protocol) -{ - errno_t result = 0; - socket_t pf_socket = NULL; - ifaddr_t *addresses = NULL; - int i; +utun_cleanup_family(ifnet_t interface, + protocol_family_t protocol) +{ + errno_t result = 0; + socket_t pf_socket = NULL; + ifaddr_t *addresses = NULL; + int i; if (protocol != PF_INET && protocol != PF_INET6) { printf("utun_cleanup_family - invalid protocol family %d\n", protocol); @@ -366,12 +1637,14 @@ utun_cleanup_family( goto cleanup; } + /* always set SS_PRIV, we want to close and detach regardless */ + sock_setpriv(pf_socket, 1); + result = utun_detach_ip(interface, protocol, pf_socket); if (result == 0 || result == ENXIO) { /* We are done! We either detached or weren't attached. */ goto cleanup; - } - else if (result != EBUSY) { + } else if (result != EBUSY) { /* Uh, not really sure what happened here... */ printf("utun_cleanup_family - utun_detach_ip failed: %d\n", result); goto cleanup; @@ -404,26 +1677,59 @@ utun_cleanup_family( } cleanup: - if (pf_socket != NULL) + if (pf_socket != NULL) { sock_close(pf_socket); + } - if (addresses != NULL) + if (addresses != NULL) { ifnet_free_address_list(addresses); + } } static errno_t -utun_ctl_disconnect( - __unused kern_ctl_ref kctlref, - __unused u_int32_t unit, - void *unitinfo) +utun_ctl_disconnect(__unused kern_ctl_ref kctlref, + __unused u_int32_t unit, + void *unitinfo) { struct utun_pcb *pcb = unitinfo; - ifnet_t ifp = pcb->utun_ifp; - errno_t result = 0; - + ifnet_t ifp = NULL; + errno_t result = 0; + + if (pcb == NULL) { + return EINVAL; + } + +#if UTUN_NEXUS + // Tell the nexus to stop all rings + if (pcb->utun_netif_nexus != NULL) { + kern_nexus_stop(pcb->utun_netif_nexus); + } +#endif // UTUN_NEXUS + + lck_rw_lock_exclusive(&pcb->utun_pcb_lock); + +#if UTUN_NEXUS + uuid_t kpipe_uuid; + uuid_copy(kpipe_uuid, pcb->utun_kpipe_uuid); + uuid_clear(pcb->utun_kpipe_uuid); + pcb->utun_kpipe_enabled = FALSE; +#endif // UTUN_NEXUS + + ifp = pcb->utun_ifp; + VERIFY(ifp != NULL); pcb->utun_ctlref = NULL; - pcb->utun_unit = 0; - + + /* + * Quiesce the interface and flush any pending outbound packets. + */ + if_down(ifp); + + /* Increment refcnt, but detach interface */ + ifnet_incr_iorefcnt(ifp); + if ((result = ifnet_detach(ifp)) != 0) { + panic("utun_ctl_disconnect - ifnet_detach failed: %d\n", result); + } + /* * We want to do everything in our power to ensure that the interface * really goes away when the socket is closed. We must remove IP/IPv6 @@ -432,75 +1738,59 @@ utun_ctl_disconnect( */ utun_cleanup_family(ifp, AF_INET); utun_cleanup_family(ifp, AF_INET6); - - if ((result = ifnet_detach(ifp)) != 0) { - printf("utun_ctl_disconnect - ifnet_detach failed: %d\n", result); - } - - if ((result = ifnet_release(ifp)) != 0) { - printf("utun_ctl_disconnect - ifnet_release failed: %d\n", result); + + lck_rw_unlock_exclusive(&pcb->utun_pcb_lock); + +#if UTUN_NEXUS + if (!uuid_is_null(kpipe_uuid)) { + if (kern_nexus_controller_free_provider_instance(utun_ncd, kpipe_uuid) == 0) { + utun_unregister_kernel_pipe_nexus(); + } } + utun_nexus_detach(&pcb->utun_nx); +#endif // UTUN_NEXUS + + /* Decrement refcnt to finish detaching and freeing */ + ifnet_decr_iorefcnt(ifp); return 0; -} +} static errno_t -utun_ctl_send( - __unused kern_ctl_ref kctlref, - __unused u_int32_t unit, - void *unitinfo, - mbuf_t m, - __unused int flags) +utun_ctl_send(__unused kern_ctl_ref kctlref, + __unused u_int32_t unit, + void *unitinfo, + mbuf_t m, + __unused int flags) { - struct utun_pcb *pcb = unitinfo; - errno_t result; - - mbuf_pkthdr_setrcvif(m, pcb->utun_ifp); - - bpf_tap_in(pcb->utun_ifp, DLT_NULL, m, 0, 0); - - if (pcb->utun_flags & UTUN_FLAGS_NO_INPUT) { - /* flush data */ - mbuf_freem(m); - return 0; - } - - if (!pcb->utun_ext_ifdata_stats) { - struct ifnet_stat_increment_param incs; - - bzero(&incs, sizeof(incs)); - incs.packets_in = 1; - incs.bytes_in = mbuf_pkthdr_len(m); - result = ifnet_input(pcb->utun_ifp, m, &incs); + /* + * The userland ABI requires the first four bytes have the protocol family + * in network byte order: swap them + */ + if (m_pktlen(m) >= (int32_t)UTUN_HEADER_SIZE((struct utun_pcb *)unitinfo)) { + *(protocol_family_t *)mbuf_data(m) = ntohl(*(protocol_family_t *)mbuf_data(m)); } else { - result = ifnet_input(pcb->utun_ifp, m, NULL); - } - if (result != 0) { - ifnet_stat_increment_in(pcb->utun_ifp, 0, 0, 1); - - printf("utun_ctl_send - ifnet_input failed: %d\n", result); - mbuf_freem(m); + printf("%s - unexpected short mbuf pkt len %d\n", __func__, m_pktlen(m) ); } - - return 0; + + return utun_pkt_input((struct utun_pcb *)unitinfo, m); } static errno_t -utun_ctl_setopt( - __unused kern_ctl_ref kctlref, - __unused u_int32_t unit, - void *unitinfo, - int opt, - void *data, - size_t len) +utun_ctl_setopt(__unused kern_ctl_ref kctlref, + __unused u_int32_t unit, + void *unitinfo, + int opt, + void *data, + size_t len) { - struct utun_pcb *pcb = unitinfo; - errno_t result = 0; - + struct utun_pcb *pcb = unitinfo; + errno_t result = 0; /* check for privileges for privileged options */ switch (opt) { case UTUN_OPT_FLAGS: case UTUN_OPT_EXT_IFDATA_STATS: + case UTUN_OPT_SET_DELEGATE_INTERFACE: if (kauth_cred_issuser(kauth_cred_get()) == 0) { return EPERM; } @@ -509,10 +1799,11 @@ utun_ctl_setopt( switch (opt) { case UTUN_OPT_FLAGS: - if (len != sizeof(u_int32_t)) + if (len != sizeof(u_int32_t)) { result = EMSGSIZE; - else + } else { pcb->utun_flags = *(u_int32_t *)data; + } break; case UTUN_OPT_EXT_IFDATA_STATS: @@ -543,120 +1834,344 @@ utun_ctl_setopt( utsp->utsp_bytes, utsp->utsp_errors); break; } - - default: + case UTUN_OPT_SET_DELEGATE_INTERFACE: { + ifnet_t del_ifp = NULL; + char name[IFNAMSIZ]; + + if (len > IFNAMSIZ - 1) { + result = EMSGSIZE; + break; + } + if (len != 0) { /* if len==0, del_ifp will be NULL causing the delegate to be removed */ + bcopy(data, name, len); + name[len] = 0; + result = ifnet_find_by_name(name, &del_ifp); + } + if (result == 0) { + result = ifnet_set_delegate(pcb->utun_ifp, del_ifp); + if (del_ifp) + ifnet_release(del_ifp); + } + break; + } + case UTUN_OPT_MAX_PENDING_PACKETS: { + u_int32_t max_pending_packets = 0; + if (len != sizeof(u_int32_t)) { + result = EMSGSIZE; + break; + } + max_pending_packets = *(u_int32_t *)data; + if (max_pending_packets == 0) { + result = EINVAL; + break; + } + pcb->utun_max_pending_packets = max_pending_packets; + break; + } +#if UTUN_NEXUS + case UTUN_OPT_ENABLE_CHANNEL: { + if (len != sizeof(int)) { + result = EMSGSIZE; + break; + } + if (*(int *)data) { + result = utun_enable_channel(pcb, current_proc()); + } else { + result = utun_disable_channel(pcb); + } + break; + } + case UTUN_OPT_ENABLE_FLOWSWITCH: { + if (len != sizeof(int)) { + result = EMSGSIZE; + break; + } + if (!if_enable_netagent) { + result = ENOTSUP; + break; + } + if (uuid_is_null(pcb->utun_nx.ms_agent)) { + result = ENOENT; + break; + } + + if (*(int *)data) { + if_add_netagent(pcb->utun_ifp, pcb->utun_nx.ms_agent); + } else { + if_delete_netagent(pcb->utun_ifp, pcb->utun_nx.ms_agent); + } + break; + } +#endif // UTUN_NEXUS + default: { result = ENOPROTOOPT; break; + } } return result; } static errno_t -utun_ctl_getopt( - __unused kern_ctl_ref kctlref, - __unused u_int32_t unit, - void *unitinfo, - int opt, - void *data, - size_t *len) +utun_ctl_getopt(__unused kern_ctl_ref kctlref, + __unused u_int32_t unit, + void *unitinfo, + int opt, + void *data, + size_t *len) { - struct utun_pcb *pcb = unitinfo; - errno_t result = 0; + struct utun_pcb *pcb = unitinfo; + errno_t result = 0; switch (opt) { case UTUN_OPT_FLAGS: - if (*len != sizeof(u_int32_t)) + if (*len != sizeof(u_int32_t)) { result = EMSGSIZE; - else + } else { *(u_int32_t *)data = pcb->utun_flags; + } break; case UTUN_OPT_EXT_IFDATA_STATS: - if (*len != sizeof(int)) + if (*len != sizeof(int)) { result = EMSGSIZE; - else + } else { *(int *)data = (pcb->utun_ext_ifdata_stats) ? 1 : 0; + } break; case UTUN_OPT_IFNAME: - *len = snprintf(data, *len, "%s%d", ifnet_name(pcb->utun_ifp), ifnet_unit(pcb->utun_ifp)) + 1; + if (*len < MIN(strlen(pcb->utun_if_xname) + 1, sizeof(pcb->utun_if_xname))) { + result = EMSGSIZE; + } else { + *len = snprintf(data, *len, "%s", pcb->utun_if_xname) + 1; + } + break; + + case UTUN_OPT_MAX_PENDING_PACKETS: { + if (*len != sizeof(u_int32_t)) { + result = EMSGSIZE; + } else { + *((u_int32_t *)data) = pcb->utun_max_pending_packets; + } + break; + } + +#if UTUN_NEXUS + case UTUN_OPT_GET_CHANNEL_UUID: + lck_rw_lock_shared(&pcb->utun_pcb_lock); + if (uuid_is_null(pcb->utun_kpipe_uuid)) { + result = ENXIO; + } else if (*len != sizeof(uuid_t)) { + result = EMSGSIZE; + } else { + uuid_copy(data, pcb->utun_kpipe_uuid); + } + lck_rw_unlock_shared(&pcb->utun_pcb_lock); break; +#endif // UTUN_NEXUS default: result = ENOPROTOOPT; break; } - - return result; + + return result; +} + +static void +utun_ctl_rcvd(kern_ctl_ref kctlref, u_int32_t unit, void *unitinfo, int flags) +{ +#pragma unused(flags) + bool reenable_output = false; + struct utun_pcb *pcb = unitinfo; + if (pcb == NULL) { + return; + } + ifnet_lock_exclusive(pcb->utun_ifp); + + u_int32_t utun_packet_cnt; + errno_t error_pc = ctl_getenqueuepacketcount(kctlref, unit, &utun_packet_cnt); + if (error_pc != 0) { + printf("utun_ctl_rcvd: ctl_getenqueuepacketcount returned error %d\n", error_pc); + utun_packet_cnt = 0; + } + + if (utun_packet_cnt < pcb->utun_max_pending_packets) { + reenable_output = true; + } + + if (reenable_output) { + errno_t error = ifnet_enable_output(pcb->utun_ifp); + if (error != 0) { + printf("utun_ctl_rcvd: ifnet_enable_output returned error %d\n", error); + } + } + ifnet_lock_done(pcb->utun_ifp); +} + +/* Network Interface functions */ +#if !UTUN_NEXUS +static void +utun_start(ifnet_t interface) +{ + mbuf_t data; + struct utun_pcb *pcb = ifnet_softc(interface); + + VERIFY(pcb != NULL); + +#if UTUN_NEXUS + lck_rw_lock_shared(&pcb->utun_pcb_lock); + if (pcb->utun_kpipe_enabled) { + /* It's possible to have channels enabled, but not yet have the channel opened, + * in which case the rxring will not be set + */ + lck_rw_unlock_shared(&pcb->utun_pcb_lock); + if (pcb->utun_kpipe_rxring != NULL) { + kern_channel_notify(pcb->utun_kpipe_rxring, 0); + } + return; + } + lck_rw_unlock_shared(&pcb->utun_pcb_lock); +#endif // UTUN_NEXUS + + for (;;) { + bool can_accept_packets = true; + ifnet_lock_shared(pcb->utun_ifp); + + u_int32_t utun_packet_cnt; + errno_t error_pc = ctl_getenqueuepacketcount(pcb->utun_ctlref, pcb->utun_unit, &utun_packet_cnt); + if (error_pc != 0) { + printf("utun_start: ctl_getenqueuepacketcount returned error %d\n", error_pc); + utun_packet_cnt = 0; + } + + can_accept_packets = (utun_packet_cnt < pcb->utun_max_pending_packets); + if (!can_accept_packets && pcb->utun_ctlref) { + u_int32_t difference = 0; + if (ctl_getenqueuereadable(pcb->utun_ctlref, pcb->utun_unit, &difference) == 0) { + if (difference > 0) { + // If the low-water mark has not yet been reached, we still need to enqueue data + // into the buffer + can_accept_packets = true; + } + } + } + if (!can_accept_packets) { + errno_t error = ifnet_disable_output(interface); + if (error != 0) { + printf("utun_start: ifnet_disable_output returned error %d\n", error); + } + ifnet_lock_done(pcb->utun_ifp); + break; + } + ifnet_lock_done(pcb->utun_ifp); + if (ifnet_dequeue(interface, &data) != 0) { + break; + } + if (utun_output(interface, data) != 0) { + break; + } + } } +#endif // !UTUN_NEXUS -/* Network Interface functions */ static errno_t -utun_output( - ifnet_t interface, - mbuf_t data) +utun_output(ifnet_t interface, + mbuf_t data) { struct utun_pcb *pcb = ifnet_softc(interface); - errno_t result; - - bpf_tap_out(pcb->utun_ifp, DLT_NULL, data, 0, 0); - + errno_t result; + + VERIFY(interface == pcb->utun_ifp); + if (pcb->utun_flags & UTUN_FLAGS_NO_OUTPUT) { /* flush data */ mbuf_freem(data); return 0; } + // otherwise, fall thru to ctl_enqueumbuf if (pcb->utun_ctlref) { - int length = mbuf_pkthdr_len(data); + int length; + + /* + * The ABI requires the protocol in network byte order + */ + if (m_pktlen(data) >= (int32_t)UTUN_HEADER_SIZE(pcb)) { + *(u_int32_t *)mbuf_data(data) = htonl(*(u_int32_t *)mbuf_data(data)); + } + + length = mbuf_pkthdr_len(data); result = ctl_enqueuembuf(pcb->utun_ctlref, pcb->utun_unit, data, CTL_DATA_EOR); if (result != 0) { mbuf_freem(data); printf("utun_output - ctl_enqueuembuf failed: %d\n", result); - +#if !UTUN_NEXUS ifnet_stat_increment_out(interface, 0, 0, 1); - } - else { - if (!pcb->utun_ext_ifdata_stats) + } else { + if (!pcb->utun_ext_ifdata_stats) { ifnet_stat_increment_out(interface, 1, length, 0); + } +#endif // !UTUN_NEXUS } - } - else + } else { mbuf_freem(data); + } return 0; } -/* Network Interface functions */ static errno_t -utun_demux( - __unused ifnet_t interface, - mbuf_t data, - __unused char *frame_header, - protocol_family_t *protocol) +utun_demux(__unused ifnet_t interface, + mbuf_t data, + __unused char *frame_header, + protocol_family_t *protocol) { + struct ip *ip; + u_int ip_version; + while (data != NULL && mbuf_len(data) < 1) { data = mbuf_next(data); } - + if (data == NULL) return ENOENT; - - *protocol = ntohl(*(u_int32_t *)mbuf_data(data)); + + ip = mtod(data, struct ip *); + ip_version = ip->ip_v; + + switch(ip_version) { + case 4: + *protocol = PF_INET; + return 0; + case 6: + *protocol = PF_INET6; + return 0; + default: + *protocol = 0; + break; + } + return 0; } +#if !UTUN_NEXUS static errno_t -utun_framer( - __unused ifnet_t interface, - mbuf_t *packet, - __unused const struct sockaddr *dest, +utun_framer(ifnet_t interface, + mbuf_t *packet, + __unused const struct sockaddr *dest, __unused const char *desk_linkaddr, - const char *frame_type) + const char *frame_type, + u_int32_t *prepend_len, + u_int32_t *postpend_len) { - if (mbuf_prepend(packet, sizeof(protocol_family_t), MBUF_DONTWAIT) != 0) { + struct utun_pcb *pcb = ifnet_softc(interface); + VERIFY(interface == pcb->utun_ifp); + + u_int32_t header_length = UTUN_HEADER_SIZE(pcb); + if (mbuf_prepend(packet, header_length, MBUF_DONTWAIT) != 0) { printf("utun_framer - ifnet_output prepend failed\n"); ifnet_stat_increment_out(interface, 0, 0, 1); @@ -664,19 +2179,26 @@ utun_framer( // just return, because the buffer was freed in mbuf_prepend return EJUSTRETURN; } + if (prepend_len != NULL) { + *prepend_len = header_length; + } + if (postpend_len != NULL) { + *postpend_len = 0; + } // place protocol number at the beginning of the mbuf - *(protocol_family_t *)mbuf_data(*packet) = htonl(*(protocol_family_t *)(uintptr_t)(size_t)frame_type); - + *(protocol_family_t *)mbuf_data(*packet) = *(protocol_family_t *)(uintptr_t)(size_t)frame_type; + + return 0; } +#endif // !UTUN_NEXUS static errno_t -utun_add_proto( - __unused ifnet_t interface, - protocol_family_t protocol, - __unused const struct ifnet_demux_desc *demux_array, - __unused u_int32_t demux_count) +utun_add_proto(__unused ifnet_t interface, + protocol_family_t protocol, + __unused const struct ifnet_demux_desc *demux_array, + __unused u_int32_t demux_count) { switch(protocol) { case PF_INET: @@ -691,24 +2213,31 @@ utun_add_proto( } static errno_t -utun_del_proto( - __unused ifnet_t interface, - __unused protocol_family_t protocol) +utun_del_proto(__unused ifnet_t interface, + __unused protocol_family_t protocol) { return 0; } static errno_t -utun_ioctl( - ifnet_t interface, - u_long command, - void *data) +utun_ioctl(ifnet_t interface, + u_long command, + void *data) { errno_t result = 0; - struct ifaddr *ifa = (struct ifaddr *)data; switch(command) { case SIOCSIFMTU: +#if UTUN_NEXUS + { + // Make sure we can fit packets in the channel buffers + // Allow for the headroom in the slot + if (((uint64_t)((struct ifreq*)data)->ifr_mtu) + UTUN_IF_HEADROOM_SIZE > UTUN_IF_DEFAULT_SLOT_SIZE) { + ifnet_set_mtu(interface, UTUN_IF_DEFAULT_SLOT_SIZE - UTUN_IF_HEADROOM_SIZE); + break; + } + } +#endif // UTUN_NEXUS ifnet_set_mtu(interface, ((struct ifreq*)data)->ifr_mtu); break; @@ -716,13 +2245,6 @@ utun_ioctl( /* ifioctl() takes care of it */ break; - case SIOCSIFADDR: - case SIOCAIFADDR: - /* This will be called for called for IPv6 Address additions */ - if (ifa->ifa_addr->sa_family == AF_INET6) - break; - /* Fall though for other families like IPv4 */ - default: result = EOPNOTSUPP; } @@ -731,62 +2253,57 @@ utun_ioctl( } static void -utun_detached( - ifnet_t interface) +utun_detached(ifnet_t interface) { struct utun_pcb *pcb = ifnet_softc(interface); - - utun_free(pcb); - - OSDecrementAtomic(&utun_ifcount); + (void)ifnet_release(interface); + utun_free_pcb(pcb); } /* Protocol Handlers */ static errno_t -utun_proto_input( - __unused ifnet_t interface, - protocol_family_t protocol, - mbuf_t m, - __unused char *frame_header) +utun_proto_input(__unused ifnet_t interface, + protocol_family_t protocol, + mbuf_t m, + __unused char *frame_header) { - - // remove protocol family first - mbuf_adj(m, sizeof(u_int32_t)); - - proto_input(protocol, m); + if (proto_input(protocol, m) != 0) { + m_freem(m); +#if !UTUN_NEXUS + ifnet_stat_increment_in(interface, 0, 0, 1); + } else { + ifnet_stat_increment_in(interface, 1, m->m_pkthdr.len, 0); +#endif // UTUN_NEXUS + } return 0; } static errno_t -utun_proto_pre_output( - __unused ifnet_t interface, - protocol_family_t protocol, - __unused mbuf_t *packet, - __unused const struct sockaddr *dest, - __unused void *route, - __unused char *frame_type, - __unused char *link_layer_dest) +utun_proto_pre_output(__unused ifnet_t interface, + protocol_family_t protocol, + __unused mbuf_t *packet, + __unused const struct sockaddr *dest, + __unused void *route, + char *frame_type, + __unused char *link_layer_dest) { - - *(protocol_family_t *)(void *)frame_type = protocol; + *(protocol_family_t *)(void *)frame_type = protocol; return 0; } static errno_t -utun_attach_proto( - ifnet_t interface, - protocol_family_t protocol) +utun_attach_proto(ifnet_t interface, + protocol_family_t protocol) { struct ifnet_attach_proto_param proto; - errno_t result; bzero(&proto, sizeof(proto)); proto.input = utun_proto_input; proto.pre_output = utun_proto_pre_output; - result = ifnet_attach_protocol(interface, protocol, &proto); + errno_t result = ifnet_attach_protocol(interface, protocol, &proto); if (result != 0 && result != EEXIST) { printf("utun_attach_inet - ifnet_attach_protocol %d failed: %d\n", protocol, result); @@ -795,3 +2312,483 @@ utun_attach_proto( return result; } +#if UTUN_NEXUS +static errno_t +utun_pkt_input(struct utun_pcb *pcb, mbuf_t packet) +{ + lck_rw_lock_shared(&pcb->utun_pcb_lock); + + lck_mtx_lock(&pcb->utun_input_chain_lock); + if (pcb->utun_input_chain != NULL) { + pcb->utun_input_chain_last->m_nextpkt = packet; + } else { + pcb->utun_input_chain = packet; + } + while (packet->m_nextpkt) { + VERIFY(packet != packet->m_nextpkt); + packet = packet->m_nextpkt; + } + pcb->utun_input_chain_last = packet; + lck_mtx_unlock(&pcb->utun_input_chain_lock); + + kern_channel_ring_t rx_ring = pcb->utun_netif_rxring; + lck_rw_unlock_shared(&pcb->utun_pcb_lock); + + if (rx_ring != NULL) { + kern_channel_notify(rx_ring, 0); + } + + return (0); +} +#else +static errno_t +utun_pkt_input (struct utun_pcb *pcb, mbuf_t m) +{ + errno_t result; + protocol_family_t protocol = 0; + + mbuf_pkthdr_setrcvif(m, pcb->utun_ifp); + + if (m_pktlen(m) >= (int32_t)UTUN_HEADER_SIZE(pcb)) { + protocol = *(u_int32_t *)mbuf_data(m); + + bpf_tap_in(pcb->utun_ifp, DLT_NULL, m, 0, 0); + } + if (pcb->utun_flags & UTUN_FLAGS_NO_INPUT) { + /* flush data */ + mbuf_freem(m); + return 0; + } + + if (!pcb->utun_ext_ifdata_stats) { + struct ifnet_stat_increment_param incs; + + bzero(&incs, sizeof(incs)); + incs.packets_in = 1; + incs.bytes_in = mbuf_pkthdr_len(m); + result = ifnet_input(pcb->utun_ifp, m, &incs); + } else { + result = ifnet_input(pcb->utun_ifp, m, NULL); + } + if (result != 0) { + ifnet_stat_increment_in(pcb->utun_ifp, 0, 0, 1); + + printf("%s - ifnet_input failed: %d\n", __FUNCTION__, result); + mbuf_freem(m); + } + + return 0; +} +#endif // UTUN_NEXUS + + +#if UTUN_NEXUS + +static errno_t +utun_nxdp_init(__unused kern_nexus_domain_provider_t domprov) +{ + return 0; +} + +static void +utun_nxdp_fini(__unused kern_nexus_domain_provider_t domprov) +{ + // Ignore +} + +static errno_t +utun_register_nexus(void) +{ + const struct kern_nexus_domain_provider_init dp_init = { + .nxdpi_version = KERN_NEXUS_DOMAIN_PROVIDER_CURRENT_VERSION, + .nxdpi_flags = 0, + .nxdpi_init = utun_nxdp_init, + .nxdpi_fini = utun_nxdp_fini + }; + errno_t err = 0; + + /* utun_nxdp_init() is called before this function returns */ + err = kern_nexus_register_domain_provider(NEXUS_TYPE_NET_IF, + (const uint8_t *) "com.apple.utun", + &dp_init, sizeof(dp_init), + &utun_nx_dom_prov); + if (err != 0) { + printf("%s: failed to register domain provider\n", __func__); + return (err); + } + return (0); +} + +static errno_t +utun_ifnet_set_attrs(ifnet_t ifp) +{ + /* Set flags and additional information. */ + ifnet_set_mtu(ifp, 1500); + ifnet_set_flags(ifp, IFF_UP | IFF_MULTICAST | IFF_POINTOPOINT, 0xffff); + + /* The interface must generate its own IPv6 LinkLocal address, + * if possible following the recommendation of RFC2472 to the 64bit interface ID + */ + ifnet_set_eflags(ifp, IFEF_NOAUTOIPV6LL, IFEF_NOAUTOIPV6LL); + + return (0); +} + +static errno_t +utun_netif_prepare(kern_nexus_t nexus, ifnet_t ifp) +{ + struct utun_pcb *pcb = kern_nexus_get_context(nexus); + pcb->utun_netif_nexus = nexus; + return (utun_ifnet_set_attrs(ifp)); +} + +static errno_t +utun_nexus_pre_connect(kern_nexus_provider_t nxprov, + proc_t p, kern_nexus_t nexus, + nexus_port_t nexus_port, kern_channel_t channel, void **ch_ctx) +{ +#pragma unused(nxprov, p) +#pragma unused(nexus, nexus_port, channel, ch_ctx) + return (0); +} + +static errno_t +utun_nexus_connected(kern_nexus_provider_t nxprov, kern_nexus_t nexus, + kern_channel_t channel) +{ +#pragma unused(nxprov, channel) + struct utun_pcb *pcb = kern_nexus_get_context(nexus); + boolean_t ok = ifnet_is_attached(pcb->utun_ifp, 1); + return (ok ? 0 : ENXIO); +} + +static void +utun_nexus_pre_disconnect(kern_nexus_provider_t nxprov, kern_nexus_t nexus, + kern_channel_t channel) +{ +#pragma unused(nxprov, nexus, channel) +} + +static void +utun_netif_pre_disconnect(kern_nexus_provider_t nxprov, kern_nexus_t nexus, + kern_channel_t channel) +{ +#pragma unused(nxprov, nexus, channel) +} + +static void +utun_nexus_disconnected(kern_nexus_provider_t nxprov, kern_nexus_t nexus, + kern_channel_t channel) +{ +#pragma unused(nxprov, channel) + struct utun_pcb *pcb = kern_nexus_get_context(nexus); + if (pcb->utun_netif_nexus == nexus) { + pcb->utun_netif_nexus = NULL; + } + ifnet_decr_iorefcnt(pcb->utun_ifp); +} + +static errno_t +utun_kpipe_ring_init(kern_nexus_provider_t nxprov, kern_nexus_t nexus, + kern_channel_t channel, kern_channel_ring_t ring, + boolean_t is_tx_ring, void **ring_ctx) +{ +#pragma unused(nxprov) +#pragma unused(channel) +#pragma unused(ring_ctx) + struct utun_pcb *pcb = kern_nexus_get_context(nexus); + if (!is_tx_ring) { + VERIFY(pcb->utun_kpipe_rxring == NULL); + pcb->utun_kpipe_rxring = ring; + } else { + VERIFY(pcb->utun_kpipe_txring == NULL); + pcb->utun_kpipe_txring = ring; + } + return 0; +} + +static void +utun_kpipe_ring_fini(kern_nexus_provider_t nxprov, kern_nexus_t nexus, + kern_channel_ring_t ring) +{ +#pragma unused(nxprov) + struct utun_pcb *pcb = kern_nexus_get_context(nexus); + if (pcb->utun_kpipe_rxring == ring) { + pcb->utun_kpipe_rxring = NULL; + } else if (pcb->utun_kpipe_txring == ring) { + pcb->utun_kpipe_txring = NULL; + } +} + +static errno_t +utun_kpipe_sync_tx(kern_nexus_provider_t nxprov, kern_nexus_t nexus, + kern_channel_ring_t tx_ring, uint32_t flags) +{ +#pragma unused(nxprov) +#pragma unused(flags) + struct utun_pcb *pcb = kern_nexus_get_context(nexus); + + lck_rw_lock_shared(&pcb->utun_pcb_lock); + int channel_enabled = pcb->utun_kpipe_enabled; + if (!channel_enabled) { + lck_rw_unlock_shared(&pcb->utun_pcb_lock); + return 0; + } + + kern_channel_slot_t tx_slot = kern_channel_get_next_slot(tx_ring, NULL, NULL); + if (tx_slot == NULL) { + // Nothing to write, bail + lck_rw_unlock_shared(&pcb->utun_pcb_lock); + return 0; + } + + // Signal the netif ring to read + kern_channel_ring_t rx_ring = pcb->utun_netif_rxring; + lck_rw_unlock_shared(&pcb->utun_pcb_lock); + if (rx_ring != NULL) { + kern_channel_notify(rx_ring, 0); + } + + return 0; +} + +static errno_t +utun_kpipe_sync_rx(kern_nexus_provider_t nxprov, kern_nexus_t nexus, + kern_channel_ring_t rx_ring, uint32_t flags) +{ +#pragma unused(nxprov) +#pragma unused(flags) + struct utun_pcb *pcb = kern_nexus_get_context(nexus); + struct kern_channel_ring_stat_increment rx_ring_stats; + + lck_rw_lock_shared(&pcb->utun_pcb_lock); + + int channel_enabled = pcb->utun_kpipe_enabled; + if (!channel_enabled) { + lck_rw_unlock_shared(&pcb->utun_pcb_lock); + return 0; + } + + /* reclaim user-released slots */ + (void) kern_channel_reclaim(rx_ring); + + uint32_t avail = kern_channel_available_slot_count(rx_ring); + if (avail == 0) { + lck_rw_unlock_shared(&pcb->utun_pcb_lock); + return 0; + } + + kern_channel_ring_t tx_ring = pcb->utun_netif_txring; + if (tx_ring == NULL || + pcb->utun_netif_nexus == NULL) { + // Net-If TX ring not set up yet, nothing to read + lck_rw_unlock_shared(&pcb->utun_pcb_lock); + return 0; + } + + struct netif_stats *nifs = &NX_NETIF_PRIVATE(pcb->utun_netif_nexus)->nif_stats; + + // Unlock utun before entering ring + lck_rw_unlock_shared(&pcb->utun_pcb_lock); + + (void)kr_enter(tx_ring, TRUE); + + // Lock again after entering and validate + lck_rw_lock_shared(&pcb->utun_pcb_lock); + if (tx_ring != pcb->utun_netif_txring) { + // Ring no longer valid + // Unlock first, then exit ring + lck_rw_unlock_shared(&pcb->utun_pcb_lock); + kr_exit(tx_ring); + return 0; + } + + struct kern_channel_ring_stat_increment tx_ring_stats; + bzero(&tx_ring_stats, sizeof(tx_ring_stats)); + kern_channel_slot_t tx_pslot = NULL; + kern_channel_slot_t tx_slot = kern_channel_get_next_slot(tx_ring, NULL, NULL); + if (tx_slot == NULL) { + // Nothing to read, don't bother signalling + // Unlock first, then exit ring + lck_rw_unlock_shared(&pcb->utun_pcb_lock); + kr_exit(tx_ring); + return 0; + } + + struct kern_pbufpool *rx_pp = rx_ring->ckr_pp; + VERIFY(rx_pp != NULL); + bzero(&rx_ring_stats, sizeof(rx_ring_stats)); + kern_channel_slot_t rx_pslot = NULL; + kern_channel_slot_t rx_slot = kern_channel_get_next_slot(rx_ring, NULL, NULL); + + while (rx_slot != NULL && tx_slot != NULL) { + size_t length; + kern_buflet_t rx_buf; + void *rx_baddr; + + kern_packet_t tx_ph = kern_channel_slot_get_packet(tx_ring, tx_slot); + + // Advance TX ring + tx_pslot = tx_slot; + tx_slot = kern_channel_get_next_slot(tx_ring, tx_slot, NULL); + + /* Skip slot if packet is zero-length or marked as dropped (QUMF_DROPPED) */ + if (tx_ph == 0) { + continue; + } + + // Allocate rx packet + kern_packet_t rx_ph = 0; + errno_t error = kern_pbufpool_alloc_nosleep(rx_pp, 1, &rx_ph); + if (unlikely(error != 0)) { + printf("utun_kpipe_sync_rx %s: failed to allocate packet\n", + pcb->utun_ifp->if_xname); + break; + } + + kern_buflet_t tx_buf = kern_packet_get_next_buflet(tx_ph, NULL); + VERIFY(tx_buf != NULL); + uint8_t *tx_baddr = kern_buflet_get_object_address(tx_buf); + VERIFY(tx_baddr != NULL); + tx_baddr += kern_buflet_get_data_offset(tx_buf); + + bpf_tap_packet_out(pcb->utun_ifp, DLT_RAW, tx_ph, NULL, 0); + + length = MIN(kern_packet_get_data_length(tx_ph) + UTUN_HEADER_SIZE(pcb), + UTUN_IF_DEFAULT_SLOT_SIZE); + + tx_ring_stats.kcrsi_slots_transferred++; + tx_ring_stats.kcrsi_bytes_transferred += length; + + if (length < UTUN_HEADER_SIZE(pcb) || + length > UTUN_IF_DEFAULT_SLOT_SIZE || + length > rx_pp->pp_buflet_size || + (pcb->utun_flags & UTUN_FLAGS_NO_OUTPUT)) { + /* flush data */ + kern_pbufpool_free(rx_pp, rx_ph); + printf("utun_kpipe_sync_rx %s: invalid length %zu header_size %zu\n", + pcb->utun_ifp->if_xname, length, UTUN_HEADER_SIZE(pcb)); + STATS_INC(nifs, NETIF_STATS_BADLEN); + STATS_INC(nifs, NETIF_STATS_DROPPED); + continue; + } + + /* fillout packet */ + rx_buf = kern_packet_get_next_buflet(rx_ph, NULL); + VERIFY(rx_buf != NULL); + rx_baddr = kern_buflet_get_object_address(rx_buf); + VERIFY(rx_baddr != NULL); + + // Find family + uint32_t af = 0; + uint8_t vhl = *(uint8_t *)(tx_baddr); + u_int ip_version = (vhl >> 4); + switch (ip_version) { + case 4: { + af = AF_INET; + break; + } + case 6: { + af = AF_INET6; + break; + } + default: { + printf("utun_kpipe_sync_rx %s: unknown ip version %u vhl %u header_size %zu\n", + pcb->utun_ifp->if_xname, ip_version, vhl, UTUN_HEADER_SIZE(pcb)); + break; + } + } + + // Copy header + af = htonl(af); + memcpy((void *)rx_baddr, &af, sizeof(af)); + if (pcb->utun_flags & UTUN_FLAGS_ENABLE_PROC_UUID) { + kern_packet_get_euuid(tx_ph, (void *)(rx_baddr + sizeof(af))); + } + + // Copy data from tx to rx + memcpy((void *)(rx_baddr + UTUN_HEADER_SIZE(pcb)), (void *)tx_baddr, length - UTUN_HEADER_SIZE(pcb)); + kern_packet_clear_flow_uuid(rx_ph); // zero flow id + + /* finalize and attach the packet */ + error = kern_buflet_set_data_offset(rx_buf, 0); + VERIFY(error == 0); + error = kern_buflet_set_data_length(rx_buf, length); + VERIFY(error == 0); + error = kern_packet_finalize(rx_ph); + VERIFY(error == 0); + error = kern_channel_slot_attach_packet(rx_ring, rx_slot, rx_ph); + VERIFY(error == 0); + + STATS_INC(nifs, NETIF_STATS_TXPKTS); + STATS_INC(nifs, NETIF_STATS_TXCOPY_DIRECT); + + rx_ring_stats.kcrsi_slots_transferred++; + rx_ring_stats.kcrsi_bytes_transferred += length; + + rx_pslot = rx_slot; + rx_slot = kern_channel_get_next_slot(rx_ring, rx_slot, NULL); + } + + if (rx_pslot) { + kern_channel_advance_slot(rx_ring, rx_pslot); + kern_channel_increment_ring_net_stats(rx_ring, pcb->utun_ifp, &rx_ring_stats); + } + + if (tx_pslot) { + kern_channel_advance_slot(tx_ring, tx_pslot); + kern_channel_increment_ring_net_stats(tx_ring, pcb->utun_ifp, &tx_ring_stats); + (void)kern_channel_reclaim(tx_ring); + } + + if (pcb->utun_output_disabled) { + errno_t error = ifnet_enable_output(pcb->utun_ifp); + if (error != 0) { + printf("utun_kpipe_sync_rx: ifnet_enable_output returned error %d\n", error); + } else { + pcb->utun_output_disabled = false; + } + } + + // Unlock first, then exit ring + lck_rw_unlock_shared(&pcb->utun_pcb_lock); + + if (tx_pslot != NULL) { + kern_channel_notify(tx_ring, 0); + } + kr_exit(tx_ring); + + return 0; +} + +#endif // UTUN_NEXUS + + +/* + * These are place holders until coreTLS kext stops calling them + */ +errno_t utun_ctl_register_dtls (void *reg); +int utun_pkt_dtls_input(struct utun_pcb *pcb, mbuf_t *pkt, protocol_family_t family); +void utun_ctl_disable_crypto_dtls(struct utun_pcb *pcb); + +errno_t +utun_ctl_register_dtls (void *reg) +{ +#pragma unused(reg) + return 0; +} + +int +utun_pkt_dtls_input(struct utun_pcb *pcb, mbuf_t *pkt, protocol_family_t family) +{ +#pragma unused(pcb) +#pragma unused(pkt) +#pragma unused(family) + return 0; +} + +void +utun_ctl_disable_crypto_dtls(struct utun_pcb *pcb) +{ +#pragma unused(pcb) +}