| /* |
| * VMware vSockets Driver |
| * |
| * Copyright (C) 2007-2013 VMware, Inc. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the Free |
| * Software Foundation version 2 and no later version. |
| * |
| * This program is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| */ |
| |
| #include <linux/types.h> |
| #include <linux/bitops.h> |
| #include <linux/cred.h> |
| #include <linux/init.h> |
| #include <linux/io.h> |
| #include <linux/kernel.h> |
| #include <linux/kmod.h> |
| #include <linux/list.h> |
| #include <linux/module.h> |
| #include <linux/mutex.h> |
| #include <linux/net.h> |
| #include <linux/poll.h> |
| #include <linux/skbuff.h> |
| #include <linux/smp.h> |
| #include <linux/socket.h> |
| #include <linux/stddef.h> |
| #include <linux/unistd.h> |
| #include <linux/wait.h> |
| #include <linux/workqueue.h> |
| #include <net/sock.h> |
| #include <net/af_vsock.h> |
| |
| #include "vmci_transport_notify.h" |
| |
| static int vmci_transport_recv_dgram_cb(void *data, struct vmci_datagram *dg); |
| static int vmci_transport_recv_stream_cb(void *data, struct vmci_datagram *dg); |
| static void vmci_transport_peer_detach_cb(u32 sub_id, |
| const struct vmci_event_data *ed, |
| void *client_data); |
| static void vmci_transport_recv_pkt_work(struct work_struct *work); |
| static void vmci_transport_cleanup(struct work_struct *work); |
| static int vmci_transport_recv_listen(struct sock *sk, |
| struct vmci_transport_packet *pkt); |
| static int vmci_transport_recv_connecting_server( |
| struct sock *sk, |
| struct sock *pending, |
| struct vmci_transport_packet *pkt); |
| static int vmci_transport_recv_connecting_client( |
| struct sock *sk, |
| struct vmci_transport_packet *pkt); |
| static int vmci_transport_recv_connecting_client_negotiate( |
| struct sock *sk, |
| struct vmci_transport_packet *pkt); |
| static int vmci_transport_recv_connecting_client_invalid( |
| struct sock *sk, |
| struct vmci_transport_packet *pkt); |
| static int vmci_transport_recv_connected(struct sock *sk, |
| struct vmci_transport_packet *pkt); |
| static bool vmci_transport_old_proto_override(bool *old_pkt_proto); |
| static u16 vmci_transport_new_proto_supported_versions(void); |
| static bool vmci_transport_proto_to_notify_struct(struct sock *sk, u16 *proto, |
| bool old_pkt_proto); |
| |
| struct vmci_transport_recv_pkt_info { |
| struct work_struct work; |
| struct sock *sk; |
| struct vmci_transport_packet pkt; |
| }; |
| |
| static LIST_HEAD(vmci_transport_cleanup_list); |
| static DEFINE_SPINLOCK(vmci_transport_cleanup_lock); |
| static DECLARE_WORK(vmci_transport_cleanup_work, vmci_transport_cleanup); |
| |
| static struct vmci_handle vmci_transport_stream_handle = { VMCI_INVALID_ID, |
| VMCI_INVALID_ID }; |
| static u32 vmci_transport_qp_resumed_sub_id = VMCI_INVALID_ID; |
| |
| static int PROTOCOL_OVERRIDE = -1; |
| |
| #define VMCI_TRANSPORT_DEFAULT_QP_SIZE_MIN 128 |
| #define VMCI_TRANSPORT_DEFAULT_QP_SIZE 262144 |
| #define VMCI_TRANSPORT_DEFAULT_QP_SIZE_MAX 262144 |
| |
| /* The default peer timeout indicates how long we will wait for a peer response |
| * to a control message. |
| */ |
| #define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ) |
| |
| /* Helper function to convert from a VMCI error code to a VSock error code. */ |
| |
| static s32 vmci_transport_error_to_vsock_error(s32 vmci_error) |
| { |
| switch (vmci_error) { |
| case VMCI_ERROR_NO_MEM: |
| return -ENOMEM; |
| case VMCI_ERROR_DUPLICATE_ENTRY: |
| case VMCI_ERROR_ALREADY_EXISTS: |
| return -EADDRINUSE; |
| case VMCI_ERROR_NO_ACCESS: |
| return -EPERM; |
| case VMCI_ERROR_NO_RESOURCES: |
| return -ENOBUFS; |
| case VMCI_ERROR_INVALID_RESOURCE: |
| return -EHOSTUNREACH; |
| case VMCI_ERROR_INVALID_ARGS: |
| default: |
| break; |
| } |
| return -EINVAL; |
| } |
| |
| static u32 vmci_transport_peer_rid(u32 peer_cid) |
| { |
| if (VMADDR_CID_HYPERVISOR == peer_cid) |
| return VMCI_TRANSPORT_HYPERVISOR_PACKET_RID; |
| |
| return VMCI_TRANSPORT_PACKET_RID; |
| } |
| |
| static inline void |
| vmci_transport_packet_init(struct vmci_transport_packet *pkt, |
| struct sockaddr_vm *src, |
| struct sockaddr_vm *dst, |
| u8 type, |
| u64 size, |
| u64 mode, |
| struct vmci_transport_waiting_info *wait, |
| u16 proto, |
| struct vmci_handle handle) |
| { |
| /* We register the stream control handler as an any cid handle so we |
| * must always send from a source address of VMADDR_CID_ANY |
| */ |
| pkt->dg.src = vmci_make_handle(VMADDR_CID_ANY, |
| VMCI_TRANSPORT_PACKET_RID); |
| pkt->dg.dst = vmci_make_handle(dst->svm_cid, |
| vmci_transport_peer_rid(dst->svm_cid)); |
| pkt->dg.payload_size = sizeof(*pkt) - sizeof(pkt->dg); |
| pkt->version = VMCI_TRANSPORT_PACKET_VERSION; |
| pkt->type = type; |
| pkt->src_port = src->svm_port; |
| pkt->dst_port = dst->svm_port; |
| memset(&pkt->proto, 0, sizeof(pkt->proto)); |
| memset(&pkt->_reserved2, 0, sizeof(pkt->_reserved2)); |
| |
| switch (pkt->type) { |
| case VMCI_TRANSPORT_PACKET_TYPE_INVALID: |
| pkt->u.size = 0; |
| break; |
| |
| case VMCI_TRANSPORT_PACKET_TYPE_REQUEST: |
| case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE: |
| pkt->u.size = size; |
| break; |
| |
| case VMCI_TRANSPORT_PACKET_TYPE_OFFER: |
| case VMCI_TRANSPORT_PACKET_TYPE_ATTACH: |
| pkt->u.handle = handle; |
| break; |
| |
| case VMCI_TRANSPORT_PACKET_TYPE_WROTE: |
| case VMCI_TRANSPORT_PACKET_TYPE_READ: |
| case VMCI_TRANSPORT_PACKET_TYPE_RST: |
| pkt->u.size = 0; |
| break; |
| |
| case VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN: |
| pkt->u.mode = mode; |
| break; |
| |
| case VMCI_TRANSPORT_PACKET_TYPE_WAITING_READ: |
| case VMCI_TRANSPORT_PACKET_TYPE_WAITING_WRITE: |
| memcpy(&pkt->u.wait, wait, sizeof(pkt->u.wait)); |
| break; |
| |
| case VMCI_TRANSPORT_PACKET_TYPE_REQUEST2: |
| case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2: |
| pkt->u.size = size; |
| pkt->proto = proto; |
| break; |
| } |
| } |
| |
| static inline void |
| vmci_transport_packet_get_addresses(struct vmci_transport_packet *pkt, |
| struct sockaddr_vm *local, |
| struct sockaddr_vm *remote) |
| { |
| vsock_addr_init(local, pkt->dg.dst.context, pkt->dst_port); |
| vsock_addr_init(remote, pkt->dg.src.context, pkt->src_port); |
| } |
| |
| static int |
| __vmci_transport_send_control_pkt(struct vmci_transport_packet *pkt, |
| struct sockaddr_vm *src, |
| struct sockaddr_vm *dst, |
| enum vmci_transport_packet_type type, |
| u64 size, |
| u64 mode, |
| struct vmci_transport_waiting_info *wait, |
| u16 proto, |
| struct vmci_handle handle, |
| bool convert_error) |
| { |
| int err; |
| |
| vmci_transport_packet_init(pkt, src, dst, type, size, mode, wait, |
| proto, handle); |
| err = vmci_datagram_send(&pkt->dg); |
| if (convert_error && (err < 0)) |
| return vmci_transport_error_to_vsock_error(err); |
| |
| return err; |
| } |
| |
| static int |
| vmci_transport_reply_control_pkt_fast(struct vmci_transport_packet *pkt, |
| enum vmci_transport_packet_type type, |
| u64 size, |
| u64 mode, |
| struct vmci_transport_waiting_info *wait, |
| struct vmci_handle handle) |
| { |
| struct vmci_transport_packet reply; |
| struct sockaddr_vm src, dst; |
| |
| if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST) { |
| return 0; |
| } else { |
| vmci_transport_packet_get_addresses(pkt, &src, &dst); |
| return __vmci_transport_send_control_pkt(&reply, &src, &dst, |
| type, |
| size, mode, wait, |
| VSOCK_PROTO_INVALID, |
| handle, true); |
| } |
| } |
| |
| static int |
| vmci_transport_send_control_pkt_bh(struct sockaddr_vm *src, |
| struct sockaddr_vm *dst, |
| enum vmci_transport_packet_type type, |
| u64 size, |
| u64 mode, |
| struct vmci_transport_waiting_info *wait, |
| struct vmci_handle handle) |
| { |
| /* Note that it is safe to use a single packet across all CPUs since |
| * two tasklets of the same type are guaranteed to not ever run |
| * simultaneously. If that ever changes, or VMCI stops using tasklets, |
| * we can use per-cpu packets. |
| */ |
| static struct vmci_transport_packet pkt; |
| |
| return __vmci_transport_send_control_pkt(&pkt, src, dst, type, |
| size, mode, wait, |
| VSOCK_PROTO_INVALID, handle, |
| false); |
| } |
| |
| static int |
| vmci_transport_alloc_send_control_pkt(struct sockaddr_vm *src, |
| struct sockaddr_vm *dst, |
| enum vmci_transport_packet_type type, |
| u64 size, |
| u64 mode, |
| struct vmci_transport_waiting_info *wait, |
| u16 proto, |
| struct vmci_handle handle) |
| { |
| struct vmci_transport_packet *pkt; |
| int err; |
| |
| pkt = kmalloc(sizeof(*pkt), GFP_KERNEL); |
| if (!pkt) |
| return -ENOMEM; |
| |
| err = __vmci_transport_send_control_pkt(pkt, src, dst, type, size, |
| mode, wait, proto, handle, |
| true); |
| kfree(pkt); |
| |
| return err; |
| } |
| |
| static int |
| vmci_transport_send_control_pkt(struct sock *sk, |
| enum vmci_transport_packet_type type, |
| u64 size, |
| u64 mode, |
| struct vmci_transport_waiting_info *wait, |
| u16 proto, |
| struct vmci_handle handle) |
| { |
| struct vsock_sock *vsk; |
| |
| vsk = vsock_sk(sk); |
| |
| if (!vsock_addr_bound(&vsk->local_addr)) |
| return -EINVAL; |
| |
| if (!vsock_addr_bound(&vsk->remote_addr)) |
| return -EINVAL; |
| |
| return vmci_transport_alloc_send_control_pkt(&vsk->local_addr, |
| &vsk->remote_addr, |
| type, size, mode, |
| wait, proto, handle); |
| } |
| |
| static int vmci_transport_send_reset_bh(struct sockaddr_vm *dst, |
| struct sockaddr_vm *src, |
| struct vmci_transport_packet *pkt) |
| { |
| if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST) |
| return 0; |
| return vmci_transport_send_control_pkt_bh( |
| dst, src, |
| VMCI_TRANSPORT_PACKET_TYPE_RST, 0, |
| 0, NULL, VMCI_INVALID_HANDLE); |
| } |
| |
| static int vmci_transport_send_reset(struct sock *sk, |
| struct vmci_transport_packet *pkt) |
| { |
| struct sockaddr_vm *dst_ptr; |
| struct sockaddr_vm dst; |
| struct vsock_sock *vsk; |
| |
| if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST) |
| return 0; |
| |
| vsk = vsock_sk(sk); |
| |
| if (!vsock_addr_bound(&vsk->local_addr)) |
| return -EINVAL; |
| |
| if (vsock_addr_bound(&vsk->remote_addr)) { |
| dst_ptr = &vsk->remote_addr; |
| } else { |
| vsock_addr_init(&dst, pkt->dg.src.context, |
| pkt->src_port); |
| dst_ptr = &dst; |
| } |
| return vmci_transport_alloc_send_control_pkt(&vsk->local_addr, dst_ptr, |
| VMCI_TRANSPORT_PACKET_TYPE_RST, |
| 0, 0, NULL, VSOCK_PROTO_INVALID, |
| VMCI_INVALID_HANDLE); |
| } |
| |
| static int vmci_transport_send_negotiate(struct sock *sk, size_t size) |
| { |
| return vmci_transport_send_control_pkt( |
| sk, |
| VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE, |
| size, 0, NULL, |
| VSOCK_PROTO_INVALID, |
| VMCI_INVALID_HANDLE); |
| } |
| |
| static int vmci_transport_send_negotiate2(struct sock *sk, size_t size, |
| u16 version) |
| { |
| return vmci_transport_send_control_pkt( |
| sk, |
| VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2, |
| size, 0, NULL, version, |
| VMCI_INVALID_HANDLE); |
| } |
| |
| static int vmci_transport_send_qp_offer(struct sock *sk, |
| struct vmci_handle handle) |
| { |
| return vmci_transport_send_control_pkt( |
| sk, VMCI_TRANSPORT_PACKET_TYPE_OFFER, 0, |
| 0, NULL, |
| VSOCK_PROTO_INVALID, handle); |
| } |
| |
| static int vmci_transport_send_attach(struct sock *sk, |
| struct vmci_handle handle) |
| { |
| return vmci_transport_send_control_pkt( |
| sk, VMCI_TRANSPORT_PACKET_TYPE_ATTACH, |
| 0, 0, NULL, VSOCK_PROTO_INVALID, |
| handle); |
| } |
| |
| static int vmci_transport_reply_reset(struct vmci_transport_packet *pkt) |
| { |
| return vmci_transport_reply_control_pkt_fast( |
| pkt, |
| VMCI_TRANSPORT_PACKET_TYPE_RST, |
| 0, 0, NULL, |
| VMCI_INVALID_HANDLE); |
| } |
| |
| static int vmci_transport_send_invalid_bh(struct sockaddr_vm *dst, |
| struct sockaddr_vm *src) |
| { |
| return vmci_transport_send_control_pkt_bh( |
| dst, src, |
| VMCI_TRANSPORT_PACKET_TYPE_INVALID, |
| 0, 0, NULL, VMCI_INVALID_HANDLE); |
| } |
| |
| int vmci_transport_send_wrote_bh(struct sockaddr_vm *dst, |
| struct sockaddr_vm *src) |
| { |
| return vmci_transport_send_control_pkt_bh( |
| dst, src, |
| VMCI_TRANSPORT_PACKET_TYPE_WROTE, 0, |
| 0, NULL, VMCI_INVALID_HANDLE); |
| } |
| |
| int vmci_transport_send_read_bh(struct sockaddr_vm *dst, |
| struct sockaddr_vm *src) |
| { |
| return vmci_transport_send_control_pkt_bh( |
| dst, src, |
| VMCI_TRANSPORT_PACKET_TYPE_READ, 0, |
| 0, NULL, VMCI_INVALID_HANDLE); |
| } |
| |
| int vmci_transport_send_wrote(struct sock *sk) |
| { |
| return vmci_transport_send_control_pkt( |
| sk, VMCI_TRANSPORT_PACKET_TYPE_WROTE, 0, |
| 0, NULL, VSOCK_PROTO_INVALID, |
| VMCI_INVALID_HANDLE); |
| } |
| |
| int vmci_transport_send_read(struct sock *sk) |
| { |
| return vmci_transport_send_control_pkt( |
| sk, VMCI_TRANSPORT_PACKET_TYPE_READ, 0, |
| 0, NULL, VSOCK_PROTO_INVALID, |
| VMCI_INVALID_HANDLE); |
| } |
| |
| int vmci_transport_send_waiting_write(struct sock *sk, |
| struct vmci_transport_waiting_info *wait) |
| { |
| return vmci_transport_send_control_pkt( |
| sk, VMCI_TRANSPORT_PACKET_TYPE_WAITING_WRITE, |
| 0, 0, wait, VSOCK_PROTO_INVALID, |
| VMCI_INVALID_HANDLE); |
| } |
| |
| int vmci_transport_send_waiting_read(struct sock *sk, |
| struct vmci_transport_waiting_info *wait) |
| { |
| return vmci_transport_send_control_pkt( |
| sk, VMCI_TRANSPORT_PACKET_TYPE_WAITING_READ, |
| 0, 0, wait, VSOCK_PROTO_INVALID, |
| VMCI_INVALID_HANDLE); |
| } |
| |
| static int vmci_transport_shutdown(struct vsock_sock *vsk, int mode) |
| { |
| return vmci_transport_send_control_pkt( |
| &vsk->sk, |
| VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN, |
| 0, mode, NULL, |
| VSOCK_PROTO_INVALID, |
| VMCI_INVALID_HANDLE); |
| } |
| |
| static int vmci_transport_send_conn_request(struct sock *sk, size_t size) |
| { |
| return vmci_transport_send_control_pkt(sk, |
| VMCI_TRANSPORT_PACKET_TYPE_REQUEST, |
| size, 0, NULL, |
| VSOCK_PROTO_INVALID, |
| VMCI_INVALID_HANDLE); |
| } |
| |
| static int vmci_transport_send_conn_request2(struct sock *sk, size_t size, |
| u16 version) |
| { |
| return vmci_transport_send_control_pkt( |
| sk, VMCI_TRANSPORT_PACKET_TYPE_REQUEST2, |
| size, 0, NULL, version, |
| VMCI_INVALID_HANDLE); |
| } |
| |
| static struct sock *vmci_transport_get_pending( |
| struct sock *listener, |
| struct vmci_transport_packet *pkt) |
| { |
| struct vsock_sock *vlistener; |
| struct vsock_sock *vpending; |
| struct sock *pending; |
| struct sockaddr_vm src; |
| |
| vsock_addr_init(&src, pkt->dg.src.context, pkt->src_port); |
| |
| vlistener = vsock_sk(listener); |
| |
| list_for_each_entry(vpending, &vlistener->pending_links, |
| pending_links) { |
| if (vsock_addr_equals_addr(&src, &vpending->remote_addr) && |
| pkt->dst_port == vpending->local_addr.svm_port) { |
| pending = sk_vsock(vpending); |
| sock_hold(pending); |
| goto found; |
| } |
| } |
| |
| pending = NULL; |
| found: |
| return pending; |
| |
| } |
| |
| static void vmci_transport_release_pending(struct sock *pending) |
| { |
| sock_put(pending); |
| } |
| |
| /* We allow two kinds of sockets to communicate with a restricted VM: 1) |
| * trusted sockets 2) sockets from applications running as the same user as the |
| * VM (this is only true for the host side and only when using hosted products) |
| */ |
| |
| static bool vmci_transport_is_trusted(struct vsock_sock *vsock, u32 peer_cid) |
| { |
| return vsock->trusted || |
| vmci_is_context_owner(peer_cid, vsock->owner->uid); |
| } |
| |
| /* We allow sending datagrams to and receiving datagrams from a restricted VM |
| * only if it is trusted as described in vmci_transport_is_trusted. |
| */ |
| |
| static bool vmci_transport_allow_dgram(struct vsock_sock *vsock, u32 peer_cid) |
| { |
| if (VMADDR_CID_HYPERVISOR == peer_cid) |
| return true; |
| |
| if (vsock->cached_peer != peer_cid) { |
| vsock->cached_peer = peer_cid; |
| if (!vmci_transport_is_trusted(vsock, peer_cid) && |
| (vmci_context_get_priv_flags(peer_cid) & |
| VMCI_PRIVILEGE_FLAG_RESTRICTED)) { |
| vsock->cached_peer_allow_dgram = false; |
| } else { |
| vsock->cached_peer_allow_dgram = true; |
| } |
| } |
| |
| return vsock->cached_peer_allow_dgram; |
| } |
| |
| static int |
| vmci_transport_queue_pair_alloc(struct vmci_qp **qpair, |
| struct vmci_handle *handle, |
| u64 produce_size, |
| u64 consume_size, |
| u32 peer, u32 flags, bool trusted) |
| { |
| int err = 0; |
| |
| if (trusted) { |
| /* Try to allocate our queue pair as trusted. This will only |
| * work if vsock is running in the host. |
| */ |
| |
| err = vmci_qpair_alloc(qpair, handle, produce_size, |
| consume_size, |
| peer, flags, |
| VMCI_PRIVILEGE_FLAG_TRUSTED); |
| if (err != VMCI_ERROR_NO_ACCESS) |
| goto out; |
| |
| } |
| |
| err = vmci_qpair_alloc(qpair, handle, produce_size, consume_size, |
| peer, flags, VMCI_NO_PRIVILEGE_FLAGS); |
| out: |
| if (err < 0) { |
| pr_err_once("Could not attach to queue pair with %d\n", err); |
| err = vmci_transport_error_to_vsock_error(err); |
| } |
| |
| return err; |
| } |
| |
| static int |
| vmci_transport_datagram_create_hnd(u32 resource_id, |
| u32 flags, |
| vmci_datagram_recv_cb recv_cb, |
| void *client_data, |
| struct vmci_handle *out_handle) |
| { |
| int err = 0; |
| |
| /* Try to allocate our datagram handler as trusted. This will only work |
| * if vsock is running in the host. |
| */ |
| |
| err = vmci_datagram_create_handle_priv(resource_id, flags, |
| VMCI_PRIVILEGE_FLAG_TRUSTED, |
| recv_cb, |
| client_data, out_handle); |
| |
| if (err == VMCI_ERROR_NO_ACCESS) |
| err = vmci_datagram_create_handle(resource_id, flags, |
| recv_cb, client_data, |
| out_handle); |
| |
| return err; |
| } |
| |
| /* This is invoked as part of a tasklet that's scheduled when the VMCI |
| * interrupt fires. This is run in bottom-half context and if it ever needs to |
| * sleep it should defer that work to a work queue. |
| */ |
| |
| static int vmci_transport_recv_dgram_cb(void *data, struct vmci_datagram *dg) |
| { |
| struct sock *sk; |
| size_t size; |
| struct sk_buff *skb; |
| struct vsock_sock *vsk; |
| |
| sk = (struct sock *)data; |
| |
| /* This handler is privileged when this module is running on the host. |
| * We will get datagrams from all endpoints (even VMs that are in a |
| * restricted context). If we get one from a restricted context then |
| * the destination socket must be trusted. |
| * |
| * NOTE: We access the socket struct without holding the lock here. |
| * This is ok because the field we are interested is never modified |
| * outside of the create and destruct socket functions. |
| */ |
| vsk = vsock_sk(sk); |
| if (!vmci_transport_allow_dgram(vsk, dg->src.context)) |
| return VMCI_ERROR_NO_ACCESS; |
| |
| size = VMCI_DG_SIZE(dg); |
| |
| /* Attach the packet to the socket's receive queue as an sk_buff. */ |
| skb = alloc_skb(size, GFP_ATOMIC); |
| if (!skb) |
| return VMCI_ERROR_NO_MEM; |
| |
| /* sk_receive_skb() will do a sock_put(), so hold here. */ |
| sock_hold(sk); |
| skb_put(skb, size); |
| memcpy(skb->data, dg, size); |
| sk_receive_skb(sk, skb, 0); |
| |
| return VMCI_SUCCESS; |
| } |
| |
| static bool vmci_transport_stream_allow(u32 cid, u32 port) |
| { |
| static const u32 non_socket_contexts[] = { |
| VMADDR_CID_RESERVED, |
| }; |
| int i; |
| |
| BUILD_BUG_ON(sizeof(cid) != sizeof(*non_socket_contexts)); |
| |
| for (i = 0; i < ARRAY_SIZE(non_socket_contexts); i++) { |
| if (cid == non_socket_contexts[i]) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| /* This is invoked as part of a tasklet that's scheduled when the VMCI |
| * interrupt fires. This is run in bottom-half context but it defers most of |
| * its work to the packet handling work queue. |
| */ |
| |
| static int vmci_transport_recv_stream_cb(void *data, struct vmci_datagram *dg) |
| { |
| struct sock *sk; |
| struct sockaddr_vm dst; |
| struct sockaddr_vm src; |
| struct vmci_transport_packet *pkt; |
| struct vsock_sock *vsk; |
| bool bh_process_pkt; |
| int err; |
| |
| sk = NULL; |
| err = VMCI_SUCCESS; |
| bh_process_pkt = false; |
| |
| /* Ignore incoming packets from contexts without sockets, or resources |
| * that aren't vsock implementations. |
| */ |
| |
| if (!vmci_transport_stream_allow(dg->src.context, -1) |
| || vmci_transport_peer_rid(dg->src.context) != dg->src.resource) |
| return VMCI_ERROR_NO_ACCESS; |
| |
| if (VMCI_DG_SIZE(dg) < sizeof(*pkt)) |
| /* Drop datagrams that do not contain full VSock packets. */ |
| return VMCI_ERROR_INVALID_ARGS; |
| |
| pkt = (struct vmci_transport_packet *)dg; |
| |
| /* Find the socket that should handle this packet. First we look for a |
| * connected socket and if there is none we look for a socket bound to |
| * the destintation address. |
| */ |
| vsock_addr_init(&src, pkt->dg.src.context, pkt->src_port); |
| vsock_addr_init(&dst, pkt->dg.dst.context, pkt->dst_port); |
| |
| sk = vsock_find_connected_socket(&src, &dst); |
| if (!sk) { |
| sk = vsock_find_bound_socket(&dst); |
| if (!sk) { |
| /* We could not find a socket for this specified |
| * address. If this packet is a RST, we just drop it. |
| * If it is another packet, we send a RST. Note that |
| * we do not send a RST reply to RSTs so that we do not |
| * continually send RSTs between two endpoints. |
| * |
| * Note that since this is a reply, dst is src and src |
| * is dst. |
| */ |
| if (vmci_transport_send_reset_bh(&dst, &src, pkt) < 0) |
| pr_err("unable to send reset\n"); |
| |
| err = VMCI_ERROR_NOT_FOUND; |
| goto out; |
| } |
| } |
| |
| /* If the received packet type is beyond all types known to this |
| * implementation, reply with an invalid message. Hopefully this will |
| * help when implementing backwards compatibility in the future. |
| */ |
| if (pkt->type >= VMCI_TRANSPORT_PACKET_TYPE_MAX) { |
| vmci_transport_send_invalid_bh(&dst, &src); |
| err = VMCI_ERROR_INVALID_ARGS; |
| goto out; |
| } |
| |
| /* This handler is privileged when this module is running on the host. |
| * We will get datagram connect requests from all endpoints (even VMs |
| * that are in a restricted context). If we get one from a restricted |
| * context then the destination socket must be trusted. |
| * |
| * NOTE: We access the socket struct without holding the lock here. |
| * This is ok because the field we are interested is never modified |
| * outside of the create and destruct socket functions. |
| */ |
| vsk = vsock_sk(sk); |
| if (!vmci_transport_allow_dgram(vsk, pkt->dg.src.context)) { |
| err = VMCI_ERROR_NO_ACCESS; |
| goto out; |
| } |
| |
| /* We do most everything in a work queue, but let's fast path the |
| * notification of reads and writes to help data transfer performance. |
| * We can only do this if there is no process context code executing |
| * for this socket since that may change the state. |
| */ |
| bh_lock_sock(sk); |
| |
| if (!sock_owned_by_user(sk)) { |
| /* The local context ID may be out of date, update it. */ |
| vsk->local_addr.svm_cid = dst.svm_cid; |
| |
| if (sk->sk_state == TCP_ESTABLISHED) |
| vmci_trans(vsk)->notify_ops->handle_notify_pkt( |
| sk, pkt, true, &dst, &src, |
| &bh_process_pkt); |
| } |
| |
| bh_unlock_sock(sk); |
| |
| if (!bh_process_pkt) { |
| struct vmci_transport_recv_pkt_info *recv_pkt_info; |
| |
| recv_pkt_info = kmalloc(sizeof(*recv_pkt_info), GFP_ATOMIC); |
| if (!recv_pkt_info) { |
| if (vmci_transport_send_reset_bh(&dst, &src, pkt) < 0) |
| pr_err("unable to send reset\n"); |
| |
| err = VMCI_ERROR_NO_MEM; |
| goto out; |
| } |
| |
| recv_pkt_info->sk = sk; |
| memcpy(&recv_pkt_info->pkt, pkt, sizeof(recv_pkt_info->pkt)); |
| INIT_WORK(&recv_pkt_info->work, vmci_transport_recv_pkt_work); |
| |
| schedule_work(&recv_pkt_info->work); |
| /* Clear sk so that the reference count incremented by one of |
| * the Find functions above is not decremented below. We need |
| * that reference count for the packet handler we've scheduled |
| * to run. |
| */ |
| sk = NULL; |
| } |
| |
| out: |
| if (sk) |
| sock_put(sk); |
| |
| return err; |
| } |
| |
| static void vmci_transport_handle_detach(struct sock *sk) |
| { |
| struct vsock_sock *vsk; |
| |
| vsk = vsock_sk(sk); |
| if (!vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle)) { |
| sock_set_flag(sk, SOCK_DONE); |
| |
| /* On a detach the peer will not be sending or receiving |
| * anymore. |
| */ |
| vsk->peer_shutdown = SHUTDOWN_MASK; |
| |
| /* We should not be sending anymore since the peer won't be |
| * there to receive, but we can still receive if there is data |
| * left in our consume queue. If the local endpoint is a host, |
| * we can't call vsock_stream_has_data, since that may block, |
| * but a host endpoint can't read data once the VM has |
| * detached, so there is no available data in that case. |
| */ |
| if (vsk->local_addr.svm_cid == VMADDR_CID_HOST || |
| vsock_stream_has_data(vsk) <= 0) { |
| if (sk->sk_state == TCP_SYN_SENT) { |
| /* The peer may detach from a queue pair while |
| * we are still in the connecting state, i.e., |
| * if the peer VM is killed after attaching to |
| * a queue pair, but before we complete the |
| * handshake. In that case, we treat the detach |
| * event like a reset. |
| */ |
| |
| sk->sk_state = TCP_CLOSE; |
| sk->sk_err = ECONNRESET; |
| sk->sk_error_report(sk); |
| return; |
| } |
| sk->sk_state = TCP_CLOSE; |
| } |
| sk->sk_state_change(sk); |
| } |
| } |
| |
| static void vmci_transport_peer_detach_cb(u32 sub_id, |
| const struct vmci_event_data *e_data, |
| void *client_data) |
| { |
| struct vmci_transport *trans = client_data; |
| const struct vmci_event_payload_qp *e_payload; |
| |
| e_payload = vmci_event_data_const_payload(e_data); |
| |
| /* XXX This is lame, we should provide a way to lookup sockets by |
| * qp_handle. |
| */ |
| if (vmci_handle_is_invalid(e_payload->handle) || |
| !vmci_handle_is_equal(trans->qp_handle, e_payload->handle)) |
| return; |
| |
| /* We don't ask for delayed CBs when we subscribe to this event (we |
| * pass 0 as flags to vmci_event_subscribe()). VMCI makes no |
| * guarantees in that case about what context we might be running in, |
| * so it could be BH or process, blockable or non-blockable. So we |
| * need to account for all possible contexts here. |
| */ |
| spin_lock_bh(&trans->lock); |
| if (!trans->sk) |
| goto out; |
| |
| /* Apart from here, trans->lock is only grabbed as part of sk destruct, |
| * where trans->sk isn't locked. |
| */ |
| bh_lock_sock(trans->sk); |
| |
| vmci_transport_handle_detach(trans->sk); |
| |
| bh_unlock_sock(trans->sk); |
| out: |
| spin_unlock_bh(&trans->lock); |
| } |
| |
| static void vmci_transport_qp_resumed_cb(u32 sub_id, |
| const struct vmci_event_data *e_data, |
| void *client_data) |
| { |
| vsock_for_each_connected_socket(vmci_transport_handle_detach); |
| } |
| |
| static void vmci_transport_recv_pkt_work(struct work_struct *work) |
| { |
| struct vmci_transport_recv_pkt_info *recv_pkt_info; |
| struct vmci_transport_packet *pkt; |
| struct sock *sk; |
| |
| recv_pkt_info = |
| container_of(work, struct vmci_transport_recv_pkt_info, work); |
| sk = recv_pkt_info->sk; |
| pkt = &recv_pkt_info->pkt; |
| |
| lock_sock(sk); |
| |
| /* The local context ID may be out of date. */ |
| vsock_sk(sk)->local_addr.svm_cid = pkt->dg.dst.context; |
| |
| switch (sk->sk_state) { |
| case TCP_LISTEN: |
| vmci_transport_recv_listen(sk, pkt); |
| break; |
| case TCP_SYN_SENT: |
| /* Processing of pending connections for servers goes through |
| * the listening socket, so see vmci_transport_recv_listen() |
| * for that path. |
| */ |
| vmci_transport_recv_connecting_client(sk, pkt); |
| break; |
| case TCP_ESTABLISHED: |
| vmci_transport_recv_connected(sk, pkt); |
| break; |
| default: |
| /* Because this function does not run in the same context as |
| * vmci_transport_recv_stream_cb it is possible that the |
| * socket has closed. We need to let the other side know or it |
| * could be sitting in a connect and hang forever. Send a |
| * reset to prevent that. |
| */ |
| vmci_transport_send_reset(sk, pkt); |
| break; |
| } |
| |
| release_sock(sk); |
| kfree(recv_pkt_info); |
| /* Release reference obtained in the stream callback when we fetched |
| * this socket out of the bound or connected list. |
| */ |
| sock_put(sk); |
| } |
| |
| static int vmci_transport_recv_listen(struct sock *sk, |
| struct vmci_transport_packet *pkt) |
| { |
| struct sock *pending; |
| struct vsock_sock *vpending; |
| int err; |
| u64 qp_size; |
| bool old_request = false; |
| bool old_pkt_proto = false; |
| |
| err = 0; |
| |
| /* Because we are in the listen state, we could be receiving a packet |
| * for ourself or any previous connection requests that we received. |
| * If it's the latter, we try to find a socket in our list of pending |
| * connections and, if we do, call the appropriate handler for the |
| * state that that socket is in. Otherwise we try to service the |
| * connection request. |
| */ |
| pending = vmci_transport_get_pending(sk, pkt); |
| if (pending) { |
| lock_sock(pending); |
| |
| /* The local context ID may be out of date. */ |
| vsock_sk(pending)->local_addr.svm_cid = pkt->dg.dst.context; |
| |
| switch (pending->sk_state) { |
| case TCP_SYN_SENT: |
| err = vmci_transport_recv_connecting_server(sk, |
| pending, |
| pkt); |
| break; |
| default: |
| vmci_transport_send_reset(pending, pkt); |
| err = -EINVAL; |
| } |
| |
| if (err < 0) |
| vsock_remove_pending(sk, pending); |
| |
| release_sock(pending); |
| vmci_transport_release_pending(pending); |
| |
| return err; |
| } |
| |
| /* The listen state only accepts connection requests. Reply with a |
| * reset unless we received a reset. |
| */ |
| |
| if (!(pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST || |
| pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST2)) { |
| vmci_transport_reply_reset(pkt); |
| return -EINVAL; |
| } |
| |
| if (pkt->u.size == 0) { |
| vmci_transport_reply_reset(pkt); |
| return -EINVAL; |
| } |
| |
| /* If this socket can't accommodate this connection request, we send a |
| * reset. Otherwise we create and initialize a child socket and reply |
| * with a connection negotiation. |
| */ |
| if (sk->sk_ack_backlog >= sk->sk_max_ack_backlog) { |
| vmci_transport_reply_reset(pkt); |
| return -ECONNREFUSED; |
| } |
| |
| pending = __vsock_create(sock_net(sk), NULL, sk, GFP_KERNEL, |
| sk->sk_type, 0); |
| if (!pending) { |
| vmci_transport_send_reset(sk, pkt); |
| return -ENOMEM; |
| } |
| |
| vpending = vsock_sk(pending); |
| |
| vsock_addr_init(&vpending->local_addr, pkt->dg.dst.context, |
| pkt->dst_port); |
| vsock_addr_init(&vpending->remote_addr, pkt->dg.src.context, |
| pkt->src_port); |
| |
| /* If the proposed size fits within our min/max, accept it. Otherwise |
| * propose our own size. |
| */ |
| if (pkt->u.size >= vmci_trans(vpending)->queue_pair_min_size && |
| pkt->u.size <= vmci_trans(vpending)->queue_pair_max_size) { |
| qp_size = pkt->u.size; |
| } else { |
| qp_size = vmci_trans(vpending)->queue_pair_size; |
| } |
| |
| /* Figure out if we are using old or new requests based on the |
| * overrides pkt types sent by our peer. |
| */ |
| if (vmci_transport_old_proto_override(&old_pkt_proto)) { |
| old_request = old_pkt_proto; |
| } else { |
| if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST) |
| old_request = true; |
| else if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_REQUEST2) |
| old_request = false; |
| |
| } |
| |
| if (old_request) { |
| /* Handle a REQUEST (or override) */ |
| u16 version = VSOCK_PROTO_INVALID; |
| if (vmci_transport_proto_to_notify_struct( |
| pending, &version, true)) |
| err = vmci_transport_send_negotiate(pending, qp_size); |
| else |
| err = -EINVAL; |
| |
| } else { |
| /* Handle a REQUEST2 (or override) */ |
| int proto_int = pkt->proto; |
| int pos; |
| u16 active_proto_version = 0; |
| |
| /* The list of possible protocols is the intersection of all |
| * protocols the client supports ... plus all the protocols we |
| * support. |
| */ |
| proto_int &= vmci_transport_new_proto_supported_versions(); |
| |
| /* We choose the highest possible protocol version and use that |
| * one. |
| */ |
| pos = fls(proto_int); |
| if (pos) { |
| active_proto_version = (1 << (pos - 1)); |
| if (vmci_transport_proto_to_notify_struct( |
| pending, &active_proto_version, false)) |
| err = vmci_transport_send_negotiate2(pending, |
| qp_size, |
| active_proto_version); |
| else |
| err = -EINVAL; |
| |
| } else { |
| err = -EINVAL; |
| } |
| } |
| |
| if (err < 0) { |
| vmci_transport_send_reset(sk, pkt); |
| sock_put(pending); |
| err = vmci_transport_error_to_vsock_error(err); |
| goto out; |
| } |
| |
| vsock_add_pending(sk, pending); |
| sk->sk_ack_backlog++; |
| |
| pending->sk_state = TCP_SYN_SENT; |
| vmci_trans(vpending)->produce_size = |
| vmci_trans(vpending)->consume_size = qp_size; |
| vmci_trans(vpending)->queue_pair_size = qp_size; |
| |
| vmci_trans(vpending)->notify_ops->process_request(pending); |
| |
| /* We might never receive another message for this socket and it's not |
| * connected to any process, so we have to ensure it gets cleaned up |
| * ourself. Our delayed work function will take care of that. Note |
| * that we do not ever cancel this function since we have few |
| * guarantees about its state when calling cancel_delayed_work(). |
| * Instead we hold a reference on the socket for that function and make |
| * it capable of handling cases where it needs to do nothing but |
| * release that reference. |
| */ |
| vpending->listener = sk; |
| sock_hold(sk); |
| sock_hold(pending); |
| schedule_delayed_work(&vpending->pending_work, HZ); |
| |
| out: |
| return err; |
| } |
| |
| static int |
| vmci_transport_recv_connecting_server(struct sock *listener, |
| struct sock *pending, |
| struct vmci_transport_packet *pkt) |
| { |
| struct vsock_sock *vpending; |
| struct vmci_handle handle; |
| struct vmci_qp *qpair; |
| bool is_local; |
| u32 flags; |
| u32 detach_sub_id; |
| int err; |
| int skerr; |
| |
| vpending = vsock_sk(pending); |
| detach_sub_id = VMCI_INVALID_ID; |
| |
| switch (pkt->type) { |
| case VMCI_TRANSPORT_PACKET_TYPE_OFFER: |
| if (vmci_handle_is_invalid(pkt->u.handle)) { |
| vmci_transport_send_reset(pending, pkt); |
| skerr = EPROTO; |
| err = -EINVAL; |
| goto destroy; |
| } |
| break; |
| default: |
| /* Close and cleanup the connection. */ |
| vmci_transport_send_reset(pending, pkt); |
| skerr = EPROTO; |
| err = pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST ? 0 : -EINVAL; |
| goto destroy; |
| } |
| |
| /* In order to complete the connection we need to attach to the offered |
| * queue pair and send an attach notification. We also subscribe to the |
| * detach event so we know when our peer goes away, and we do that |
| * before attaching so we don't miss an event. If all this succeeds, |
| * we update our state and wakeup anything waiting in accept() for a |
| * connection. |
| */ |
| |
| /* We don't care about attach since we ensure the other side has |
| * attached by specifying the ATTACH_ONLY flag below. |
| */ |
| err = vmci_event_subscribe(VMCI_EVENT_QP_PEER_DETACH, |
| vmci_transport_peer_detach_cb, |
| vmci_trans(vpending), &detach_sub_id); |
| if (err < VMCI_SUCCESS) { |
| vmci_transport_send_reset(pending, pkt); |
| err = vmci_transport_error_to_vsock_error(err); |
| skerr = -err; |
| goto destroy; |
| } |
| |
| vmci_trans(vpending)->detach_sub_id = detach_sub_id; |
| |
| /* Now attach to the queue pair the client created. */ |
| handle = pkt->u.handle; |
| |
| /* vpending->local_addr always has a context id so we do not need to |
| * worry about VMADDR_CID_ANY in this case. |
| */ |
| is_local = |
| vpending->remote_addr.svm_cid == vpending->local_addr.svm_cid; |
| flags = VMCI_QPFLAG_ATTACH_ONLY; |
| flags |= is_local ? VMCI_QPFLAG_LOCAL : 0; |
| |
| err = vmci_transport_queue_pair_alloc( |
| &qpair, |
| &handle, |
| vmci_trans(vpending)->produce_size, |
| vmci_trans(vpending)->consume_size, |
| pkt->dg.src.context, |
| flags, |
| vmci_transport_is_trusted( |
| vpending, |
| vpending->remote_addr.svm_cid)); |
| if (err < 0) { |
| vmci_transport_send_reset(pending, pkt); |
| skerr = -err; |
| goto destroy; |
| } |
| |
| vmci_trans(vpending)->qp_handle = handle; |
| vmci_trans(vpending)->qpair = qpair; |
| |
| /* When we send the attach message, we must be ready to handle incoming |
| * control messages on the newly connected socket. So we move the |
| * pending socket to the connected state before sending the attach |
| * message. Otherwise, an incoming packet triggered by the attach being |
| * received by the peer may be processed concurrently with what happens |
| * below after sending the attach message, and that incoming packet |
| * will find the listening socket instead of the (currently) pending |
| * socket. Note that enqueueing the socket increments the reference |
| * count, so even if a reset comes before the connection is accepted, |
| * the socket will be valid until it is removed from the queue. |
| * |
| * If we fail sending the attach below, we remove the socket from the |
| * connected list and move the socket to TCP_CLOSE before |
| * releasing the lock, so a pending slow path processing of an incoming |
| * packet will not see the socket in the connected state in that case. |
| */ |
| pending->sk_state = TCP_ESTABLISHED; |
| |
| vsock_insert_connected(vpending); |
| |
| /* Notify our peer of our attach. */ |
| err = vmci_transport_send_attach(pending, handle); |
| if (err < 0) { |
| vsock_remove_connected(vpending); |
| pr_err("Could not send attach\n"); |
| vmci_transport_send_reset(pending, pkt); |
| err = vmci_transport_error_to_vsock_error(err); |
| skerr = -err; |
| goto destroy; |
| } |
| |
| /* We have a connection. Move the now connected socket from the |
| * listener's pending list to the accept queue so callers of accept() |
| * can find it. |
| */ |
| vsock_remove_pending(listener, pending); |
| vsock_enqueue_accept(listener, pending); |
| |
| /* Callers of accept() will be be waiting on the listening socket, not |
| * the pending socket. |
| */ |
| listener->sk_data_ready(listener); |
| |
| return 0; |
| |
| destroy: |
| pending->sk_err = skerr; |
| pending->sk_state = TCP_CLOSE; |
| /* As long as we drop our reference, all necessary cleanup will handle |
| * when the cleanup function drops its reference and our destruct |
| * implementation is called. Note that since the listen handler will |
| * remove pending from the pending list upon our failure, the cleanup |
| * function won't drop the additional reference, which is why we do it |
| * here. |
| */ |
| sock_put(pending); |
| |
| return err; |
| } |
| |
| static int |
| vmci_transport_recv_connecting_client(struct sock *sk, |
| struct vmci_transport_packet *pkt) |
| { |
| struct vsock_sock *vsk; |
| int err; |
| int skerr; |
| |
| vsk = vsock_sk(sk); |
| |
| switch (pkt->type) { |
| case VMCI_TRANSPORT_PACKET_TYPE_ATTACH: |
| if (vmci_handle_is_invalid(pkt->u.handle) || |
| !vmci_handle_is_equal(pkt->u.handle, |
| vmci_trans(vsk)->qp_handle)) { |
| skerr = EPROTO; |
| err = -EINVAL; |
| goto destroy; |
| } |
| |
| /* Signify the socket is connected and wakeup the waiter in |
| * connect(). Also place the socket in the connected table for |
| * accounting (it can already be found since it's in the bound |
| * table). |
| */ |
| sk->sk_state = TCP_ESTABLISHED; |
| sk->sk_socket->state = SS_CONNECTED; |
| vsock_insert_connected(vsk); |
| sk->sk_state_change(sk); |
| |
| break; |
| case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE: |
| case VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2: |
| if (pkt->u.size == 0 |
| || pkt->dg.src.context != vsk->remote_addr.svm_cid |
| || pkt->src_port != vsk->remote_addr.svm_port |
| || !vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle) |
| || vmci_trans(vsk)->qpair |
| || vmci_trans(vsk)->produce_size != 0 |
| || vmci_trans(vsk)->consume_size != 0 |
| || vmci_trans(vsk)->detach_sub_id != VMCI_INVALID_ID) { |
| skerr = EPROTO; |
| err = -EINVAL; |
| |
| goto destroy; |
| } |
| |
| err = vmci_transport_recv_connecting_client_negotiate(sk, pkt); |
| if (err) { |
| skerr = -err; |
| goto destroy; |
| } |
| |
| break; |
| case VMCI_TRANSPORT_PACKET_TYPE_INVALID: |
| err = vmci_transport_recv_connecting_client_invalid(sk, pkt); |
| if (err) { |
| skerr = -err; |
| goto destroy; |
| } |
| |
| break; |
| case VMCI_TRANSPORT_PACKET_TYPE_RST: |
| /* Older versions of the linux code (WS 6.5 / ESX 4.0) used to |
| * continue processing here after they sent an INVALID packet. |
| * This meant that we got a RST after the INVALID. We ignore a |
| * RST after an INVALID. The common code doesn't send the RST |
| * ... so we can hang if an old version of the common code |
| * fails between getting a REQUEST and sending an OFFER back. |
| * Not much we can do about it... except hope that it doesn't |
| * happen. |
| */ |
| if (vsk->ignore_connecting_rst) { |
| vsk->ignore_connecting_rst = false; |
| } else { |
| skerr = ECONNRESET; |
| err = 0; |
| goto destroy; |
| } |
| |
| break; |
| default: |
| /* Close and cleanup the connection. */ |
| skerr = EPROTO; |
| err = -EINVAL; |
| goto destroy; |
| } |
| |
| return 0; |
| |
| destroy: |
| vmci_transport_send_reset(sk, pkt); |
| |
| sk->sk_state = TCP_CLOSE; |
| sk->sk_err = skerr; |
| sk->sk_error_report(sk); |
| return err; |
| } |
| |
| static int vmci_transport_recv_connecting_client_negotiate( |
| struct sock *sk, |
| struct vmci_transport_packet *pkt) |
| { |
| int err; |
| struct vsock_sock *vsk; |
| struct vmci_handle handle; |
| struct vmci_qp *qpair; |
| u32 detach_sub_id; |
| bool is_local; |
| u32 flags; |
| bool old_proto = true; |
| bool old_pkt_proto; |
| u16 version; |
| |
| vsk = vsock_sk(sk); |
| handle = VMCI_INVALID_HANDLE; |
| detach_sub_id = VMCI_INVALID_ID; |
| |
| /* If we have gotten here then we should be past the point where old |
| * linux vsock could have sent the bogus rst. |
| */ |
| vsk->sent_request = false; |
| vsk->ignore_connecting_rst = false; |
| |
| /* Verify that we're OK with the proposed queue pair size */ |
| if (pkt->u.size < vmci_trans(vsk)->queue_pair_min_size || |
| pkt->u.size > vmci_trans(vsk)->queue_pair_max_size) { |
| err = -EINVAL; |
| goto destroy; |
| } |
| |
| /* At this point we know the CID the peer is using to talk to us. */ |
| |
| if (vsk->local_addr.svm_cid == VMADDR_CID_ANY) |
| vsk->local_addr.svm_cid = pkt->dg.dst.context; |
| |
| /* Setup the notify ops to be the highest supported version that both |
| * the server and the client support. |
| */ |
| |
| if (vmci_transport_old_proto_override(&old_pkt_proto)) { |
| old_proto = old_pkt_proto; |
| } else { |
| if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE) |
| old_proto = true; |
| else if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2) |
| old_proto = false; |
| |
| } |
| |
| if (old_proto) |
| version = VSOCK_PROTO_INVALID; |
| else |
| version = pkt->proto; |
| |
| if (!vmci_transport_proto_to_notify_struct(sk, &version, old_proto)) { |
| err = -EINVAL; |
| goto destroy; |
| } |
| |
| /* Subscribe to detach events first. |
| * |
| * XXX We attach once for each queue pair created for now so it is easy |
| * to find the socket (it's provided), but later we should only |
| * subscribe once and add a way to lookup sockets by queue pair handle. |
| */ |
| err = vmci_event_subscribe(VMCI_EVENT_QP_PEER_DETACH, |
| vmci_transport_peer_detach_cb, |
| vmci_trans(vsk), &detach_sub_id); |
| if (err < VMCI_SUCCESS) { |
| err = vmci_transport_error_to_vsock_error(err); |
| goto destroy; |
| } |
| |
| /* Make VMCI select the handle for us. */ |
| handle = VMCI_INVALID_HANDLE; |
| is_local = vsk->remote_addr.svm_cid == vsk->local_addr.svm_cid; |
| flags = is_local ? VMCI_QPFLAG_LOCAL : 0; |
| |
| err = vmci_transport_queue_pair_alloc(&qpair, |
| &handle, |
| pkt->u.size, |
| pkt->u.size, |
| vsk->remote_addr.svm_cid, |
| flags, |
| vmci_transport_is_trusted( |
| vsk, |
| vsk-> |
| remote_addr.svm_cid)); |
| if (err < 0) |
| goto destroy; |
| |
| err = vmci_transport_send_qp_offer(sk, handle); |
| if (err < 0) { |
| err = vmci_transport_error_to_vsock_error(err); |
| goto destroy; |
| } |
| |
| vmci_trans(vsk)->qp_handle = handle; |
| vmci_trans(vsk)->qpair = qpair; |
| |
| vmci_trans(vsk)->produce_size = vmci_trans(vsk)->consume_size = |
| pkt->u.size; |
| |
| vmci_trans(vsk)->detach_sub_id = detach_sub_id; |
| |
| vmci_trans(vsk)->notify_ops->process_negotiate(sk); |
| |
| return 0; |
| |
| destroy: |
| if (detach_sub_id != VMCI_INVALID_ID) |
| vmci_event_unsubscribe(detach_sub_id); |
| |
| if (!vmci_handle_is_invalid(handle)) |
| vmci_qpair_detach(&qpair); |
| |
| return err; |
| } |
| |
| static int |
| vmci_transport_recv_connecting_client_invalid(struct sock *sk, |
| struct vmci_transport_packet *pkt) |
| { |
| int err = 0; |
| struct vsock_sock *vsk = vsock_sk(sk); |
| |
| if (vsk->sent_request) { |
| vsk->sent_request = false; |
| vsk->ignore_connecting_rst = true; |
| |
| err = vmci_transport_send_conn_request( |
| sk, vmci_trans(vsk)->queue_pair_size); |
| if (err < 0) |
| err = vmci_transport_error_to_vsock_error(err); |
| else |
| err = 0; |
| |
| } |
| |
| return err; |
| } |
| |
| static int vmci_transport_recv_connected(struct sock *sk, |
| struct vmci_transport_packet *pkt) |
| { |
| struct vsock_sock *vsk; |
| bool pkt_processed = false; |
| |
| /* In cases where we are closing the connection, it's sufficient to |
| * mark the state change (and maybe error) and wake up any waiting |
| * threads. Since this is a connected socket, it's owned by a user |
| * process and will be cleaned up when the failure is passed back on |
| * the current or next system call. Our system call implementations |
| * must therefore check for error and state changes on entry and when |
| * being awoken. |
| */ |
| switch (pkt->type) { |
| case VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN: |
| if (pkt->u.mode) { |
| vsk = vsock_sk(sk); |
| |
| vsk->peer_shutdown |= pkt->u.mode; |
| sk->sk_state_change(sk); |
| } |
| break; |
| |
| case VMCI_TRANSPORT_PACKET_TYPE_RST: |
| vsk = vsock_sk(sk); |
| /* It is possible that we sent our peer a message (e.g a |
| * WAITING_READ) right before we got notified that the peer had |
| * detached. If that happens then we can get a RST pkt back |
| * from our peer even though there is data available for us to |
| * read. In that case, don't shutdown the socket completely but |
| * instead allow the local client to finish reading data off |
| * the queuepair. Always treat a RST pkt in connected mode like |
| * a clean shutdown. |
| */ |
| sock_set_flag(sk, SOCK_DONE); |
| vsk->peer_shutdown = SHUTDOWN_MASK; |
| if (vsock_stream_has_data(vsk) <= 0) |
| sk->sk_state = TCP_CLOSING; |
| |
| sk->sk_state_change(sk); |
| break; |
| |
| default: |
| vsk = vsock_sk(sk); |
| vmci_trans(vsk)->notify_ops->handle_notify_pkt( |
| sk, pkt, false, NULL, NULL, |
| &pkt_processed); |
| if (!pkt_processed) |
| return -EINVAL; |
| |
| break; |
| } |
| |
| return 0; |
| } |
| |
| static int vmci_transport_socket_init(struct vsock_sock *vsk, |
| struct vsock_sock *psk) |
| { |
| vsk->trans = kmalloc(sizeof(struct vmci_transport), GFP_KERNEL); |
| if (!vsk->trans) |
| return -ENOMEM; |
| |
| vmci_trans(vsk)->dg_handle = VMCI_INVALID_HANDLE; |
| vmci_trans(vsk)->qp_handle = VMCI_INVALID_HANDLE; |
| vmci_trans(vsk)->qpair = NULL; |
| vmci_trans(vsk)->produce_size = vmci_trans(vsk)->consume_size = 0; |
| vmci_trans(vsk)->detach_sub_id = VMCI_INVALID_ID; |
| vmci_trans(vsk)->notify_ops = NULL; |
| INIT_LIST_HEAD(&vmci_trans(vsk)->elem); |
| vmci_trans(vsk)->sk = &vsk->sk; |
| spin_lock_init(&vmci_trans(vsk)->lock); |
| if (psk) { |
| vmci_trans(vsk)->queue_pair_size = |
| vmci_trans(psk)->queue_pair_size; |
| vmci_trans(vsk)->queue_pair_min_size = |
| vmci_trans(psk)->queue_pair_min_size; |
| vmci_trans(vsk)->queue_pair_max_size = |
| vmci_trans(psk)->queue_pair_max_size; |
| } else { |
| vmci_trans(vsk)->queue_pair_size = |
| VMCI_TRANSPORT_DEFAULT_QP_SIZE; |
| vmci_trans(vsk)->queue_pair_min_size = |
| VMCI_TRANSPORT_DEFAULT_QP_SIZE_MIN; |
| vmci_trans(vsk)->queue_pair_max_size = |
| VMCI_TRANSPORT_DEFAULT_QP_SIZE_MAX; |
| } |
| |
| return 0; |
| } |
| |
| static void vmci_transport_free_resources(struct list_head *transport_list) |
| { |
| while (!list_empty(transport_list)) { |
| struct vmci_transport *transport = |
| list_first_entry(transport_list, struct vmci_transport, |
| elem); |
| list_del(&transport->elem); |
| |
| if (transport->detach_sub_id != VMCI_INVALID_ID) { |
| vmci_event_unsubscribe(transport->detach_sub_id); |
| transport->detach_sub_id = VMCI_INVALID_ID; |
| } |
| |
| if (!vmci_handle_is_invalid(transport->qp_handle)) { |
| vmci_qpair_detach(&transport->qpair); |
| transport->qp_handle = VMCI_INVALID_HANDLE; |
| transport->produce_size = 0; |
| transport->consume_size = 0; |
| } |
| |
| kfree(transport); |
| } |
| } |
| |
| static void vmci_transport_cleanup(struct work_struct *work) |
| { |
| LIST_HEAD(pending); |
| |
| spin_lock_bh(&vmci_transport_cleanup_lock); |
| list_replace_init(&vmci_transport_cleanup_list, &pending); |
| spin_unlock_bh(&vmci_transport_cleanup_lock); |
| vmci_transport_free_resources(&pending); |
| } |
| |
| static void vmci_transport_destruct(struct vsock_sock *vsk) |
| { |
| /* transport can be NULL if we hit a failure at init() time */ |
| if (!vmci_trans(vsk)) |
| return; |
| |
| /* Ensure that the detach callback doesn't use the sk/vsk |
| * we are about to destruct. |
| */ |
| spin_lock_bh(&vmci_trans(vsk)->lock); |
| vmci_trans(vsk)->sk = NULL; |
| spin_unlock_bh(&vmci_trans(vsk)->lock); |
| |
| if (vmci_trans(vsk)->notify_ops) |
| vmci_trans(vsk)->notify_ops->socket_destruct(vsk); |
| |
| spin_lock_bh(&vmci_transport_cleanup_lock); |
| list_add(&vmci_trans(vsk)->elem, &vmci_transport_cleanup_list); |
| spin_unlock_bh(&vmci_transport_cleanup_lock); |
| schedule_work(&vmci_transport_cleanup_work); |
| |
| vsk->trans = NULL; |
| } |
| |
| static void vmci_transport_release(struct vsock_sock *vsk) |
| { |
| vsock_remove_sock(vsk); |
| |
| if (!vmci_handle_is_invalid(vmci_trans(vsk)->dg_handle)) { |
| vmci_datagram_destroy_handle(vmci_trans(vsk)->dg_handle); |
| vmci_trans(vsk)->dg_handle = VMCI_INVALID_HANDLE; |
| } |
| } |
| |
| static int vmci_transport_dgram_bind(struct vsock_sock *vsk, |
| struct sockaddr_vm *addr) |
| { |
| u32 port; |
| u32 flags; |
| int err; |
| |
| /* VMCI will select a resource ID for us if we provide |
| * VMCI_INVALID_ID. |
| */ |
| port = addr->svm_port == VMADDR_PORT_ANY ? |
| VMCI_INVALID_ID : addr->svm_port; |
| |
| if (port <= LAST_RESERVED_PORT && !capable(CAP_NET_BIND_SERVICE)) |
| return -EACCES; |
| |
| flags = addr->svm_cid == VMADDR_CID_ANY ? |
| VMCI_FLAG_ANYCID_DG_HND : 0; |
| |
| err = vmci_transport_datagram_create_hnd(port, flags, |
| vmci_transport_recv_dgram_cb, |
| &vsk->sk, |
| &vmci_trans(vsk)->dg_handle); |
| if (err < VMCI_SUCCESS) |
| return vmci_transport_error_to_vsock_error(err); |
| vsock_addr_init(&vsk->local_addr, addr->svm_cid, |
| vmci_trans(vsk)->dg_handle.resource); |
| |
| return 0; |
| } |
| |
| static int vmci_transport_dgram_enqueue( |
| struct vsock_sock *vsk, |
| struct sockaddr_vm *remote_addr, |
| struct msghdr *msg, |
| size_t len) |
| { |
| int err; |
| struct vmci_datagram *dg; |
| |
| if (len > VMCI_MAX_DG_PAYLOAD_SIZE) |
| return -EMSGSIZE; |
| |
| if (!vmci_transport_allow_dgram(vsk, remote_addr->svm_cid)) |
| return -EPERM; |
| |
| /* Allocate a buffer for the user's message and our packet header. */ |
| dg = kmalloc(len + sizeof(*dg), GFP_KERNEL); |
| if (!dg) |
| return -ENOMEM; |
| |
| memcpy_from_msg(VMCI_DG_PAYLOAD(dg), msg, len); |
| |
| dg->dst = vmci_make_handle(remote_addr->svm_cid, |
| remote_addr->svm_port); |
| dg->src = vmci_make_handle(vsk->local_addr.svm_cid, |
| vsk->local_addr.svm_port); |
| dg->payload_size = len; |
| |
| err = vmci_datagram_send(dg); |
| kfree(dg); |
| if (err < 0) |
| return vmci_transport_error_to_vsock_error(err); |
| |
| return err - sizeof(*dg); |
| } |
| |
| static int vmci_transport_dgram_dequeue(struct vsock_sock *vsk, |
| struct msghdr *msg, size_t len, |
| int flags) |
| { |
| int err; |
| int noblock; |
| struct vmci_datagram *dg; |
| size_t payload_len; |
| struct sk_buff *skb; |
| |
| noblock = flags & MSG_DONTWAIT; |
| |
| if (flags & MSG_OOB || flags & MSG_ERRQUEUE) |
| return -EOPNOTSUPP; |
| |
| /* Retrieve the head sk_buff from the socket's receive queue. */ |
| err = 0; |
| skb = skb_recv_datagram(&vsk->sk, flags, noblock, &err); |
| if (!skb) |
| return err; |
| |
| dg = (struct vmci_datagram *)skb->data; |
| if (!dg) |
| /* err is 0, meaning we read zero bytes. */ |
| goto out; |
| |
| payload_len = dg->payload_size; |
| /* Ensure the sk_buff matches the payload size claimed in the packet. */ |
| if (payload_len != skb->len - sizeof(*dg)) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| if (payload_len > len) { |
| payload_len = len; |
| msg->msg_flags |= MSG_TRUNC; |
| } |
| |
| /* Place the datagram payload in the user's iovec. */ |
| err = skb_copy_datagram_msg(skb, sizeof(*dg), msg, payload_len); |
| if (err) |
| goto out; |
| |
| if (msg->msg_name) { |
| /* Provide the address of the sender. */ |
| DECLARE_SOCKADDR(struct sockaddr_vm *, vm_addr, msg->msg_name); |
| vsock_addr_init(vm_addr, dg->src.context, dg->src.resource); |
| msg->msg_namelen = sizeof(*vm_addr); |
| } |
| err = payload_len; |
| |
| out: |
| skb_free_datagram(&vsk->sk, skb); |
| return err; |
| } |
| |
| static bool vmci_transport_dgram_allow(u32 cid, u32 port) |
| { |
| if (cid == VMADDR_CID_HYPERVISOR) { |
| /* Registrations of PBRPC Servers do not modify VMX/Hypervisor |
| * state and are allowed. |
| */ |
| return port == VMCI_UNITY_PBRPC_REGISTER; |
| } |
| |
| return true; |
| } |
| |
| static int vmci_transport_connect(struct vsock_sock *vsk) |
| { |
| int err; |
| bool old_pkt_proto = false; |
| struct sock *sk = &vsk->sk; |
| |
| if (vmci_transport_old_proto_override(&old_pkt_proto) && |
| old_pkt_proto) { |
| err = vmci_transport_send_conn_request( |
| sk, vmci_trans(vsk)->queue_pair_size); |
| if (err < 0) { |
| sk->sk_state = TCP_CLOSE; |
| return err; |
| } |
| } else { |
| int supported_proto_versions = |
| vmci_transport_new_proto_supported_versions(); |
| err = vmci_transport_send_conn_request2( |
| sk, vmci_trans(vsk)->queue_pair_size, |
| supported_proto_versions); |
| if (err < 0) { |
| sk->sk_state = TCP_CLOSE; |
| return err; |
| } |
| |
| vsk->sent_request = true; |
| } |
| |
| return err; |
| } |
| |
| static ssize_t vmci_transport_stream_dequeue( |
| struct vsock_sock *vsk, |
| struct msghdr *msg, |
| size_t len, |
| int flags) |
| { |
| if (flags & MSG_PEEK) |
| return vmci_qpair_peekv(vmci_trans(vsk)->qpair, msg, len, 0); |
| else |
| return vmci_qpair_dequev(vmci_trans(vsk)->qpair, msg, len, 0); |
| } |
| |
| static ssize_t vmci_transport_stream_enqueue( |
| struct vsock_sock *vsk, |
| struct msghdr *msg, |
| size_t len) |
| { |
| return vmci_qpair_enquev(vmci_trans(vsk)->qpair, msg, len, 0); |
| } |
| |
| static s64 vmci_transport_stream_has_data(struct vsock_sock *vsk) |
| { |
| return vmci_qpair_consume_buf_ready(vmci_trans(vsk)->qpair); |
| } |
| |
| static s64 vmci_transport_stream_has_space(struct vsock_sock *vsk) |
| { |
| return vmci_qpair_produce_free_space(vmci_trans(vsk)->qpair); |
| } |
| |
| static u64 vmci_transport_stream_rcvhiwat(struct vsock_sock *vsk) |
| { |
| return vmci_trans(vsk)->consume_size; |
| } |
| |
| static bool vmci_transport_stream_is_active(struct vsock_sock *vsk) |
| { |
| return !vmci_handle_is_invalid(vmci_trans(vsk)->qp_handle); |
| } |
| |
| static u64 vmci_transport_get_buffer_size(struct vsock_sock *vsk) |
| { |
| return vmci_trans(vsk)->queue_pair_size; |
| } |
| |
| static u64 vmci_transport_get_min_buffer_size(struct vsock_sock *vsk) |
| { |
| return vmci_trans(vsk)->queue_pair_min_size; |
| } |
| |
| static u64 vmci_transport_get_max_buffer_size(struct vsock_sock *vsk) |
| { |
| return vmci_trans(vsk)->queue_pair_max_size; |
| } |
| |
| static void vmci_transport_set_buffer_size(struct vsock_sock *vsk, u64 val) |
| { |
| if (val < vmci_trans(vsk)->queue_pair_min_size) |
| vmci_trans(vsk)->queue_pair_min_size = val; |
| if (val > vmci_trans(vsk)->queue_pair_max_size) |
| vmci_trans(vsk)->queue_pair_max_size = val; |
| vmci_trans(vsk)->queue_pair_size = val; |
| } |
| |
| static void vmci_transport_set_min_buffer_size(struct vsock_sock *vsk, |
| u64 val) |
| { |
| if (val > vmci_trans(vsk)->queue_pair_size) |
| vmci_trans(vsk)->queue_pair_size = val; |
| vmci_trans(vsk)->queue_pair_min_size = val; |
| } |
| |
| static void vmci_transport_set_max_buffer_size(struct vsock_sock *vsk, |
| u64 val) |
| { |
| if (val < vmci_trans(vsk)->queue_pair_size) |
| vmci_trans(vsk)->queue_pair_size = val; |
| vmci_trans(vsk)->queue_pair_max_size = val; |
| } |
| |
| static int vmci_transport_notify_poll_in( |
| struct vsock_sock *vsk, |
| size_t target, |
| bool *data_ready_now) |
| { |
| return vmci_trans(vsk)->notify_ops->poll_in( |
| &vsk->sk, target, data_ready_now); |
| } |
| |
| static int vmci_transport_notify_poll_out( |
| struct vsock_sock *vsk, |
| size_t target, |
| bool *space_available_now) |
| { |
| return vmci_trans(vsk)->notify_ops->poll_out( |
| &vsk->sk, target, space_available_now); |
| } |
| |
| static int vmci_transport_notify_recv_init( |
| struct vsock_sock *vsk, |
| size_t target, |
| struct vsock_transport_recv_notify_data *data) |
| { |
| return vmci_trans(vsk)->notify_ops->recv_init( |
| &vsk->sk, target, |
| (struct vmci_transport_recv_notify_data *)data); |
| } |
| |
| static int vmci_transport_notify_recv_pre_block( |
| struct vsock_sock *vsk, |
| size_t target, |
| struct vsock_transport_recv_notify_data *data) |
| { |
| return vmci_trans(vsk)->notify_ops->recv_pre_block( |
| &vsk->sk, target, |
| (struct vmci_transport_recv_notify_data *)data); |
| } |
| |
| static int vmci_transport_notify_recv_pre_dequeue( |
| struct vsock_sock *vsk, |
| size_t target, |
| struct vsock_transport_recv_notify_data *data) |
| { |
| return vmci_trans(vsk)->notify_ops->recv_pre_dequeue( |
| &vsk->sk, target, |
| (struct vmci_transport_recv_notify_data *)data); |
| } |
| |
| static int vmci_transport_notify_recv_post_dequeue( |
| struct vsock_sock *vsk, |
| size_t target, |
| ssize_t copied, |
| bool data_read, |
| struct vsock_transport_recv_notify_data *data) |
| { |
| return vmci_trans(vsk)->notify_ops->recv_post_dequeue( |
| &vsk->sk, target, copied, data_read, |
| (struct vmci_transport_recv_notify_data *)data); |
| } |
| |
| static int vmci_transport_notify_send_init( |
| struct vsock_sock *vsk, |
| struct vsock_transport_send_notify_data *data) |
| { |
| return vmci_trans(vsk)->notify_ops->send_init( |
| &vsk->sk, |
| (struct vmci_transport_send_notify_data *)data); |
| } |
| |
| static int vmci_transport_notify_send_pre_block( |
| struct vsock_sock *vsk, |
| struct vsock_transport_send_notify_data *data) |
| { |
| return vmci_trans(vsk)->notify_ops->send_pre_block( |
| &vsk->sk, |
| (struct vmci_transport_send_notify_data *)data); |
| } |
| |
| static int vmci_transport_notify_send_pre_enqueue( |
| struct vsock_sock *vsk, |
| struct vsock_transport_send_notify_data *data) |
| { |
| return vmci_trans(vsk)->notify_ops->send_pre_enqueue( |
| &vsk->sk, |
| (struct vmci_transport_send_notify_data *)data); |
| } |
| |
| static int vmci_transport_notify_send_post_enqueue( |
| struct vsock_sock *vsk, |
| ssize_t written, |
| struct vsock_transport_send_notify_data *data) |
| { |
| return vmci_trans(vsk)->notify_ops->send_post_enqueue( |
| &vsk->sk, written, |
| (struct vmci_transport_send_notify_data *)data); |
| } |
| |
| static bool vmci_transport_old_proto_override(bool *old_pkt_proto) |
| { |
| if (PROTOCOL_OVERRIDE != -1) { |
| if (PROTOCOL_OVERRIDE == 0) |
| *old_pkt_proto = true; |
| else |
| *old_pkt_proto = false; |
| |
| pr_info("Proto override in use\n"); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static bool vmci_transport_proto_to_notify_struct(struct sock *sk, |
| u16 *proto, |
| bool old_pkt_proto) |
| { |
| struct vsock_sock *vsk = vsock_sk(sk); |
| |
| if (old_pkt_proto) { |
| if (*proto != VSOCK_PROTO_INVALID) { |
| pr_err("Can't set both an old and new protocol\n"); |
| return false; |
| } |
| vmci_trans(vsk)->notify_ops = &vmci_transport_notify_pkt_ops; |
| goto exit; |
| } |
| |
| switch (*proto) { |
| case VSOCK_PROTO_PKT_ON_NOTIFY: |
| vmci_trans(vsk)->notify_ops = |
| &vmci_transport_notify_pkt_q_state_ops; |
| break; |
| default: |
| pr_err("Unknown notify protocol version\n"); |
| return false; |
| } |
| |
| exit: |
| vmci_trans(vsk)->notify_ops->socket_init(sk); |
| return true; |
| } |
| |
| static u16 vmci_transport_new_proto_supported_versions(void) |
| { |
| if (PROTOCOL_OVERRIDE != -1) |
| return PROTOCOL_OVERRIDE; |
| |
| return VSOCK_PROTO_ALL_SUPPORTED; |
| } |
| |
| static u32 vmci_transport_get_local_cid(void) |
| { |
| return vmci_get_context_id(); |
| } |
| |
| static const struct vsock_transport vmci_transport = { |
| .init = vmci_transport_socket_init, |
| .destruct = vmci_transport_destruct, |
| .release = vmci_transport_release, |
| .connect = vmci_transport_connect, |
| .dgram_bind = vmci_transport_dgram_bind, |
| .dgram_dequeue = vmci_transport_dgram_dequeue, |
| .dgram_enqueue = vmci_transport_dgram_enqueue, |
| .dgram_allow = vmci_transport_dgram_allow, |
| .stream_dequeue = vmci_transport_stream_dequeue, |
| .stream_enqueue = vmci_transport_stream_enqueue, |
| .stream_has_data = vmci_transport_stream_has_data, |
| .stream_has_space = vmci_transport_stream_has_space, |
| .stream_rcvhiwat = vmci_transport_stream_rcvhiwat, |
| .stream_is_active = vmci_transport_stream_is_active, |
| .stream_allow = vmci_transport_stream_allow, |
| .notify_poll_in = vmci_transport_notify_poll_in, |
| .notify_poll_out = vmci_transport_notify_poll_out, |
| .notify_recv_init = vmci_transport_notify_recv_init, |
| .notify_recv_pre_block = vmci_transport_notify_recv_pre_block, |
| .notify_recv_pre_dequeue = vmci_transport_notify_recv_pre_dequeue, |
| .notify_recv_post_dequeue = vmci_transport_notify_recv_post_dequeue, |
| .notify_send_init = vmci_transport_notify_send_init, |
| .notify_send_pre_block = vmci_transport_notify_send_pre_block, |
| .notify_send_pre_enqueue = vmci_transport_notify_send_pre_enqueue, |
| .notify_send_post_enqueue = vmci_transport_notify_send_post_enqueue, |
| .shutdown = vmci_transport_shutdown, |
| .set_buffer_size = vmci_transport_set_buffer_size, |
| .set_min_buffer_size = vmci_transport_set_min_buffer_size, |
| .set_max_buffer_size = vmci_transport_set_max_buffer_size, |
| .get_buffer_size = vmci_transport_get_buffer_size, |
| .get_min_buffer_size = vmci_transport_get_min_buffer_size, |
| .get_max_buffer_size = vmci_transport_get_max_buffer_size, |
| .get_local_cid = vmci_transport_get_local_cid, |
| }; |
| |
| static int __init vmci_transport_init(void) |
| { |
| int err; |
| |
| /* Create the datagram handle that we will use to send and receive all |
| * VSocket control messages for this context. |
| */ |
| err = vmci_transport_datagram_create_hnd(VMCI_TRANSPORT_PACKET_RID, |
| VMCI_FLAG_ANYCID_DG_HND, |
| vmci_transport_recv_stream_cb, |
| NULL, |
| &vmci_transport_stream_handle); |
| if (err < VMCI_SUCCESS) { |
| pr_err("Unable to create datagram handle. (%d)\n", err); |
| return vmci_transport_error_to_vsock_error(err); |
| } |
| |
| err = vmci_event_subscribe(VMCI_EVENT_QP_RESUMED, |
| vmci_transport_qp_resumed_cb, |
| NULL, &vmci_transport_qp_resumed_sub_id); |
| if (err < VMCI_SUCCESS) { |
| pr_err("Unable to subscribe to resumed event. (%d)\n", err); |
| err = vmci_transport_error_to_vsock_error(err); |
| vmci_transport_qp_resumed_sub_id = VMCI_INVALID_ID; |
| goto err_destroy_stream_handle; |
| } |
| |
| err = vsock_core_init(&vmci_transport); |
| if (err < 0) |
| goto err_unsubscribe; |
| |
| return 0; |
| |
| err_unsubscribe: |
| vmci_event_unsubscribe(vmci_transport_qp_resumed_sub_id); |
| err_destroy_stream_handle: |
| vmci_datagram_destroy_handle(vmci_transport_stream_handle); |
| return err; |
| } |
| module_init(vmci_transport_init); |
| |
| static void __exit vmci_transport_exit(void) |
| { |
| cancel_work_sync(&vmci_transport_cleanup_work); |
| vmci_transport_free_resources(&vmci_transport_cleanup_list); |
| |
| if (!vmci_handle_is_invalid(vmci_transport_stream_handle)) { |
| if (vmci_datagram_destroy_handle( |
| vmci_transport_stream_handle) != VMCI_SUCCESS) |
| pr_err("Couldn't destroy datagram handle\n"); |
| vmci_transport_stream_handle = VMCI_INVALID_HANDLE; |
| } |
| |
| if (vmci_transport_qp_resumed_sub_id != VMCI_INVALID_ID) { |
| vmci_event_unsubscribe(vmci_transport_qp_resumed_sub_id); |
| vmci_transport_qp_resumed_sub_id = VMCI_INVALID_ID; |
| } |
| |
| vsock_core_exit(); |
| } |
| module_exit(vmci_transport_exit); |
| |
| MODULE_AUTHOR("VMware, Inc."); |
| MODULE_DESCRIPTION("VMCI transport for Virtual Sockets"); |
| MODULE_VERSION("1.0.5.0-k"); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_ALIAS("vmware_vsock"); |
| MODULE_ALIAS_NETPROTO(PF_VSOCK); |