2 * common code for virtio vsock
4 * Copyright (C) 2013-2015 Red Hat, Inc.
5 * Author: Asias He <asias@redhat.com>
6 * Stefan Hajnoczi <stefanha@redhat.com>
8 * This work is licensed under the terms of the GNU GPL, version 2.
10 #include <linux/spinlock.h>
11 #include <linux/module.h>
12 #include <linux/sched/signal.h>
13 #include <linux/ctype.h>
14 #include <linux/list.h>
15 #include <linux/virtio.h>
16 #include <linux/virtio_ids.h>
17 #include <linux/virtio_config.h>
18 #include <linux/virtio_vsock.h>
19 #include <uapi/linux/vsockmon.h>
22 #include <net/af_vsock.h>
24 #define CREATE_TRACE_POINTS
25 #include <trace/events/vsock_virtio_transport_common.h>
27 /* How long to wait for graceful shutdown of a connection */
28 #define VSOCK_CLOSE_TIMEOUT (8 * HZ)
30 static const struct virtio_transport *virtio_transport_get_ops(void)
32 const struct vsock_transport *t = vsock_core_get_transport();
34 return container_of(t, struct virtio_transport, transport);
37 static struct virtio_vsock_pkt *
38 virtio_transport_alloc_pkt(struct virtio_vsock_pkt_info *info,
45 struct virtio_vsock_pkt *pkt;
48 pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
52 pkt->hdr.type = cpu_to_le16(info->type);
53 pkt->hdr.op = cpu_to_le16(info->op);
54 pkt->hdr.src_cid = cpu_to_le64(src_cid);
55 pkt->hdr.dst_cid = cpu_to_le64(dst_cid);
56 pkt->hdr.src_port = cpu_to_le32(src_port);
57 pkt->hdr.dst_port = cpu_to_le32(dst_port);
58 pkt->hdr.flags = cpu_to_le32(info->flags);
60 pkt->hdr.len = cpu_to_le32(len);
61 pkt->reply = info->reply;
64 if (info->msg && len > 0) {
65 pkt->buf = kmalloc(len, GFP_KERNEL);
68 err = memcpy_from_msg(pkt->buf, info->msg, len);
73 trace_virtio_transport_alloc_pkt(src_cid, src_port,
90 static struct sk_buff *virtio_transport_build_skb(void *opaque)
92 struct virtio_vsock_pkt *pkt = opaque;
93 unsigned char *t_hdr, *payload;
94 struct af_vsockmon_hdr *hdr;
97 skb = alloc_skb(sizeof(*hdr) + sizeof(pkt->hdr) + pkt->len,
102 hdr = (struct af_vsockmon_hdr *)skb_put(skb, sizeof(*hdr));
104 /* pkt->hdr is little-endian so no need to byteswap here */
105 hdr->src_cid = pkt->hdr.src_cid;
106 hdr->src_port = pkt->hdr.src_port;
107 hdr->dst_cid = pkt->hdr.dst_cid;
108 hdr->dst_port = pkt->hdr.dst_port;
110 hdr->transport = cpu_to_le16(AF_VSOCK_TRANSPORT_VIRTIO);
111 hdr->len = cpu_to_le16(sizeof(pkt->hdr));
112 memset(hdr->reserved, 0, sizeof(hdr->reserved));
114 switch (le16_to_cpu(pkt->hdr.op)) {
115 case VIRTIO_VSOCK_OP_REQUEST:
116 case VIRTIO_VSOCK_OP_RESPONSE:
117 hdr->op = cpu_to_le16(AF_VSOCK_OP_CONNECT);
119 case VIRTIO_VSOCK_OP_RST:
120 case VIRTIO_VSOCK_OP_SHUTDOWN:
121 hdr->op = cpu_to_le16(AF_VSOCK_OP_DISCONNECT);
123 case VIRTIO_VSOCK_OP_RW:
124 hdr->op = cpu_to_le16(AF_VSOCK_OP_PAYLOAD);
126 case VIRTIO_VSOCK_OP_CREDIT_UPDATE:
127 case VIRTIO_VSOCK_OP_CREDIT_REQUEST:
128 hdr->op = cpu_to_le16(AF_VSOCK_OP_CONTROL);
131 hdr->op = cpu_to_le16(AF_VSOCK_OP_UNKNOWN);
135 t_hdr = skb_put(skb, sizeof(pkt->hdr));
136 memcpy(t_hdr, &pkt->hdr, sizeof(pkt->hdr));
139 payload = skb_put(skb, pkt->len);
140 memcpy(payload, pkt->buf, pkt->len);
146 void virtio_transport_deliver_tap_pkt(struct virtio_vsock_pkt *pkt)
148 vsock_deliver_tap(virtio_transport_build_skb, pkt);
150 EXPORT_SYMBOL_GPL(virtio_transport_deliver_tap_pkt);
152 static int virtio_transport_send_pkt_info(struct vsock_sock *vsk,
153 struct virtio_vsock_pkt_info *info)
155 u32 src_cid, src_port, dst_cid, dst_port;
156 struct virtio_vsock_sock *vvs;
157 struct virtio_vsock_pkt *pkt;
158 u32 pkt_len = info->pkt_len;
160 src_cid = vm_sockets_get_local_cid();
161 src_port = vsk->local_addr.svm_port;
162 if (!info->remote_cid) {
163 dst_cid = vsk->remote_addr.svm_cid;
164 dst_port = vsk->remote_addr.svm_port;
166 dst_cid = info->remote_cid;
167 dst_port = info->remote_port;
172 /* we can send less than pkt_len bytes */
173 if (pkt_len > VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE)
174 pkt_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE;
176 /* virtio_transport_get_credit might return less than pkt_len credit */
177 pkt_len = virtio_transport_get_credit(vvs, pkt_len);
179 /* Do not send zero length OP_RW pkt */
180 if (pkt_len == 0 && info->op == VIRTIO_VSOCK_OP_RW)
183 pkt = virtio_transport_alloc_pkt(info, pkt_len,
187 virtio_transport_put_credit(vvs, pkt_len);
191 virtio_transport_inc_tx_pkt(vvs, pkt);
193 return virtio_transport_get_ops()->send_pkt(pkt);
196 static void virtio_transport_inc_rx_pkt(struct virtio_vsock_sock *vvs,
197 struct virtio_vsock_pkt *pkt)
199 vvs->rx_bytes += pkt->len;
202 static void virtio_transport_dec_rx_pkt(struct virtio_vsock_sock *vvs,
203 struct virtio_vsock_pkt *pkt)
205 vvs->rx_bytes -= pkt->len;
206 vvs->fwd_cnt += pkt->len;
209 void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct virtio_vsock_pkt *pkt)
211 spin_lock_bh(&vvs->tx_lock);
212 pkt->hdr.fwd_cnt = cpu_to_le32(vvs->fwd_cnt);
213 pkt->hdr.buf_alloc = cpu_to_le32(vvs->buf_alloc);
214 spin_unlock_bh(&vvs->tx_lock);
216 EXPORT_SYMBOL_GPL(virtio_transport_inc_tx_pkt);
218 u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 credit)
222 spin_lock_bh(&vvs->tx_lock);
223 ret = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt);
227 spin_unlock_bh(&vvs->tx_lock);
231 EXPORT_SYMBOL_GPL(virtio_transport_get_credit);
233 void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit)
235 spin_lock_bh(&vvs->tx_lock);
236 vvs->tx_cnt -= credit;
237 spin_unlock_bh(&vvs->tx_lock);
239 EXPORT_SYMBOL_GPL(virtio_transport_put_credit);
241 static int virtio_transport_send_credit_update(struct vsock_sock *vsk,
243 struct virtio_vsock_hdr *hdr)
245 struct virtio_vsock_pkt_info info = {
246 .op = VIRTIO_VSOCK_OP_CREDIT_UPDATE,
251 return virtio_transport_send_pkt_info(vsk, &info);
255 virtio_transport_stream_do_dequeue(struct vsock_sock *vsk,
259 struct virtio_vsock_sock *vvs = vsk->trans;
260 struct virtio_vsock_pkt *pkt;
261 size_t bytes, total = 0;
264 spin_lock_bh(&vvs->rx_lock);
265 while (total < len && !list_empty(&vvs->rx_queue)) {
266 pkt = list_first_entry(&vvs->rx_queue,
267 struct virtio_vsock_pkt, list);
270 if (bytes > pkt->len - pkt->off)
271 bytes = pkt->len - pkt->off;
273 /* sk_lock is held by caller so no one else can dequeue.
274 * Unlock rx_lock since memcpy_to_msg() may sleep.
276 spin_unlock_bh(&vvs->rx_lock);
278 err = memcpy_to_msg(msg, pkt->buf + pkt->off, bytes);
282 spin_lock_bh(&vvs->rx_lock);
286 if (pkt->off == pkt->len) {
287 virtio_transport_dec_rx_pkt(vvs, pkt);
288 list_del(&pkt->list);
289 virtio_transport_free_pkt(pkt);
292 spin_unlock_bh(&vvs->rx_lock);
294 /* Send a credit pkt to peer */
295 virtio_transport_send_credit_update(vsk, VIRTIO_VSOCK_TYPE_STREAM,
307 virtio_transport_stream_dequeue(struct vsock_sock *vsk,
309 size_t len, int flags)
311 if (flags & MSG_PEEK)
314 return virtio_transport_stream_do_dequeue(vsk, msg, len);
316 EXPORT_SYMBOL_GPL(virtio_transport_stream_dequeue);
319 virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
321 size_t len, int flags)
325 EXPORT_SYMBOL_GPL(virtio_transport_dgram_dequeue);
327 s64 virtio_transport_stream_has_data(struct vsock_sock *vsk)
329 struct virtio_vsock_sock *vvs = vsk->trans;
332 spin_lock_bh(&vvs->rx_lock);
333 bytes = vvs->rx_bytes;
334 spin_unlock_bh(&vvs->rx_lock);
338 EXPORT_SYMBOL_GPL(virtio_transport_stream_has_data);
340 static s64 virtio_transport_has_space(struct vsock_sock *vsk)
342 struct virtio_vsock_sock *vvs = vsk->trans;
345 bytes = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt);
352 s64 virtio_transport_stream_has_space(struct vsock_sock *vsk)
354 struct virtio_vsock_sock *vvs = vsk->trans;
357 spin_lock_bh(&vvs->tx_lock);
358 bytes = virtio_transport_has_space(vsk);
359 spin_unlock_bh(&vvs->tx_lock);
363 EXPORT_SYMBOL_GPL(virtio_transport_stream_has_space);
365 int virtio_transport_do_socket_init(struct vsock_sock *vsk,
366 struct vsock_sock *psk)
368 struct virtio_vsock_sock *vvs;
370 vvs = kzalloc(sizeof(*vvs), GFP_KERNEL);
377 struct virtio_vsock_sock *ptrans = psk->trans;
379 vvs->buf_size = ptrans->buf_size;
380 vvs->buf_size_min = ptrans->buf_size_min;
381 vvs->buf_size_max = ptrans->buf_size_max;
382 vvs->peer_buf_alloc = ptrans->peer_buf_alloc;
384 vvs->buf_size = VIRTIO_VSOCK_DEFAULT_BUF_SIZE;
385 vvs->buf_size_min = VIRTIO_VSOCK_DEFAULT_MIN_BUF_SIZE;
386 vvs->buf_size_max = VIRTIO_VSOCK_DEFAULT_MAX_BUF_SIZE;
389 vvs->buf_alloc = vvs->buf_size;
391 spin_lock_init(&vvs->rx_lock);
392 spin_lock_init(&vvs->tx_lock);
393 INIT_LIST_HEAD(&vvs->rx_queue);
397 EXPORT_SYMBOL_GPL(virtio_transport_do_socket_init);
399 u64 virtio_transport_get_buffer_size(struct vsock_sock *vsk)
401 struct virtio_vsock_sock *vvs = vsk->trans;
403 return vvs->buf_size;
405 EXPORT_SYMBOL_GPL(virtio_transport_get_buffer_size);
407 u64 virtio_transport_get_min_buffer_size(struct vsock_sock *vsk)
409 struct virtio_vsock_sock *vvs = vsk->trans;
411 return vvs->buf_size_min;
413 EXPORT_SYMBOL_GPL(virtio_transport_get_min_buffer_size);
415 u64 virtio_transport_get_max_buffer_size(struct vsock_sock *vsk)
417 struct virtio_vsock_sock *vvs = vsk->trans;
419 return vvs->buf_size_max;
421 EXPORT_SYMBOL_GPL(virtio_transport_get_max_buffer_size);
423 void virtio_transport_set_buffer_size(struct vsock_sock *vsk, u64 val)
425 struct virtio_vsock_sock *vvs = vsk->trans;
427 if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
428 val = VIRTIO_VSOCK_MAX_BUF_SIZE;
429 if (val < vvs->buf_size_min)
430 vvs->buf_size_min = val;
431 if (val > vvs->buf_size_max)
432 vvs->buf_size_max = val;
434 vvs->buf_alloc = val;
436 EXPORT_SYMBOL_GPL(virtio_transport_set_buffer_size);
438 void virtio_transport_set_min_buffer_size(struct vsock_sock *vsk, u64 val)
440 struct virtio_vsock_sock *vvs = vsk->trans;
442 if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
443 val = VIRTIO_VSOCK_MAX_BUF_SIZE;
444 if (val > vvs->buf_size)
446 vvs->buf_size_min = val;
448 EXPORT_SYMBOL_GPL(virtio_transport_set_min_buffer_size);
450 void virtio_transport_set_max_buffer_size(struct vsock_sock *vsk, u64 val)
452 struct virtio_vsock_sock *vvs = vsk->trans;
454 if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
455 val = VIRTIO_VSOCK_MAX_BUF_SIZE;
456 if (val < vvs->buf_size)
458 vvs->buf_size_max = val;
460 EXPORT_SYMBOL_GPL(virtio_transport_set_max_buffer_size);
463 virtio_transport_notify_poll_in(struct vsock_sock *vsk,
465 bool *data_ready_now)
467 if (vsock_stream_has_data(vsk))
468 *data_ready_now = true;
470 *data_ready_now = false;
474 EXPORT_SYMBOL_GPL(virtio_transport_notify_poll_in);
477 virtio_transport_notify_poll_out(struct vsock_sock *vsk,
479 bool *space_avail_now)
483 free_space = vsock_stream_has_space(vsk);
485 *space_avail_now = true;
486 else if (free_space == 0)
487 *space_avail_now = false;
491 EXPORT_SYMBOL_GPL(virtio_transport_notify_poll_out);
493 int virtio_transport_notify_recv_init(struct vsock_sock *vsk,
494 size_t target, struct vsock_transport_recv_notify_data *data)
498 EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_init);
500 int virtio_transport_notify_recv_pre_block(struct vsock_sock *vsk,
501 size_t target, struct vsock_transport_recv_notify_data *data)
505 EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_pre_block);
507 int virtio_transport_notify_recv_pre_dequeue(struct vsock_sock *vsk,
508 size_t target, struct vsock_transport_recv_notify_data *data)
512 EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_pre_dequeue);
514 int virtio_transport_notify_recv_post_dequeue(struct vsock_sock *vsk,
515 size_t target, ssize_t copied, bool data_read,
516 struct vsock_transport_recv_notify_data *data)
520 EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_post_dequeue);
522 int virtio_transport_notify_send_init(struct vsock_sock *vsk,
523 struct vsock_transport_send_notify_data *data)
527 EXPORT_SYMBOL_GPL(virtio_transport_notify_send_init);
529 int virtio_transport_notify_send_pre_block(struct vsock_sock *vsk,
530 struct vsock_transport_send_notify_data *data)
534 EXPORT_SYMBOL_GPL(virtio_transport_notify_send_pre_block);
536 int virtio_transport_notify_send_pre_enqueue(struct vsock_sock *vsk,
537 struct vsock_transport_send_notify_data *data)
541 EXPORT_SYMBOL_GPL(virtio_transport_notify_send_pre_enqueue);
543 int virtio_transport_notify_send_post_enqueue(struct vsock_sock *vsk,
544 ssize_t written, struct vsock_transport_send_notify_data *data)
548 EXPORT_SYMBOL_GPL(virtio_transport_notify_send_post_enqueue);
550 u64 virtio_transport_stream_rcvhiwat(struct vsock_sock *vsk)
552 struct virtio_vsock_sock *vvs = vsk->trans;
554 return vvs->buf_size;
556 EXPORT_SYMBOL_GPL(virtio_transport_stream_rcvhiwat);
558 bool virtio_transport_stream_is_active(struct vsock_sock *vsk)
562 EXPORT_SYMBOL_GPL(virtio_transport_stream_is_active);
564 bool virtio_transport_stream_allow(u32 cid, u32 port)
568 EXPORT_SYMBOL_GPL(virtio_transport_stream_allow);
570 int virtio_transport_dgram_bind(struct vsock_sock *vsk,
571 struct sockaddr_vm *addr)
575 EXPORT_SYMBOL_GPL(virtio_transport_dgram_bind);
577 bool virtio_transport_dgram_allow(u32 cid, u32 port)
581 EXPORT_SYMBOL_GPL(virtio_transport_dgram_allow);
583 int virtio_transport_connect(struct vsock_sock *vsk)
585 struct virtio_vsock_pkt_info info = {
586 .op = VIRTIO_VSOCK_OP_REQUEST,
587 .type = VIRTIO_VSOCK_TYPE_STREAM,
591 return virtio_transport_send_pkt_info(vsk, &info);
593 EXPORT_SYMBOL_GPL(virtio_transport_connect);
595 int virtio_transport_shutdown(struct vsock_sock *vsk, int mode)
597 struct virtio_vsock_pkt_info info = {
598 .op = VIRTIO_VSOCK_OP_SHUTDOWN,
599 .type = VIRTIO_VSOCK_TYPE_STREAM,
600 .flags = (mode & RCV_SHUTDOWN ?
601 VIRTIO_VSOCK_SHUTDOWN_RCV : 0) |
602 (mode & SEND_SHUTDOWN ?
603 VIRTIO_VSOCK_SHUTDOWN_SEND : 0),
607 return virtio_transport_send_pkt_info(vsk, &info);
609 EXPORT_SYMBOL_GPL(virtio_transport_shutdown);
612 virtio_transport_dgram_enqueue(struct vsock_sock *vsk,
613 struct sockaddr_vm *remote_addr,
619 EXPORT_SYMBOL_GPL(virtio_transport_dgram_enqueue);
622 virtio_transport_stream_enqueue(struct vsock_sock *vsk,
626 struct virtio_vsock_pkt_info info = {
627 .op = VIRTIO_VSOCK_OP_RW,
628 .type = VIRTIO_VSOCK_TYPE_STREAM,
634 return virtio_transport_send_pkt_info(vsk, &info);
636 EXPORT_SYMBOL_GPL(virtio_transport_stream_enqueue);
638 void virtio_transport_destruct(struct vsock_sock *vsk)
640 struct virtio_vsock_sock *vvs = vsk->trans;
644 EXPORT_SYMBOL_GPL(virtio_transport_destruct);
646 static int virtio_transport_reset(struct vsock_sock *vsk,
647 struct virtio_vsock_pkt *pkt)
649 struct virtio_vsock_pkt_info info = {
650 .op = VIRTIO_VSOCK_OP_RST,
651 .type = VIRTIO_VSOCK_TYPE_STREAM,
656 /* Send RST only if the original pkt is not a RST pkt */
657 if (pkt && le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST)
660 return virtio_transport_send_pkt_info(vsk, &info);
663 /* Normally packets are associated with a socket. There may be no socket if an
664 * attempt was made to connect to a socket that does not exist.
666 static int virtio_transport_reset_no_sock(struct virtio_vsock_pkt *pkt)
668 struct virtio_vsock_pkt_info info = {
669 .op = VIRTIO_VSOCK_OP_RST,
670 .type = le16_to_cpu(pkt->hdr.type),
674 /* Send RST only if the original pkt is not a RST pkt */
675 if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST)
678 pkt = virtio_transport_alloc_pkt(&info, 0,
679 le64_to_cpu(pkt->hdr.dst_cid),
680 le32_to_cpu(pkt->hdr.dst_port),
681 le64_to_cpu(pkt->hdr.src_cid),
682 le32_to_cpu(pkt->hdr.src_port));
686 return virtio_transport_get_ops()->send_pkt(pkt);
689 static void virtio_transport_wait_close(struct sock *sk, long timeout)
692 DEFINE_WAIT_FUNC(wait, woken_wake_function);
694 add_wait_queue(sk_sleep(sk), &wait);
697 if (sk_wait_event(sk, &timeout,
698 sock_flag(sk, SOCK_DONE), &wait))
700 } while (!signal_pending(current) && timeout);
702 remove_wait_queue(sk_sleep(sk), &wait);
706 static void virtio_transport_do_close(struct vsock_sock *vsk,
709 struct sock *sk = sk_vsock(vsk);
711 sock_set_flag(sk, SOCK_DONE);
712 vsk->peer_shutdown = SHUTDOWN_MASK;
713 if (vsock_stream_has_data(vsk) <= 0)
714 sk->sk_state = SS_DISCONNECTING;
715 sk->sk_state_change(sk);
717 if (vsk->close_work_scheduled &&
718 (!cancel_timeout || cancel_delayed_work(&vsk->close_work))) {
719 vsk->close_work_scheduled = false;
721 vsock_remove_sock(vsk);
723 /* Release refcnt obtained when we scheduled the timeout */
728 static void virtio_transport_close_timeout(struct work_struct *work)
730 struct vsock_sock *vsk =
731 container_of(work, struct vsock_sock, close_work.work);
732 struct sock *sk = sk_vsock(vsk);
737 if (!sock_flag(sk, SOCK_DONE)) {
738 (void)virtio_transport_reset(vsk, NULL);
740 virtio_transport_do_close(vsk, false);
743 vsk->close_work_scheduled = false;
749 /* User context, vsk->sk is locked */
750 static bool virtio_transport_close(struct vsock_sock *vsk)
752 struct sock *sk = &vsk->sk;
754 if (!(sk->sk_state == SS_CONNECTED ||
755 sk->sk_state == SS_DISCONNECTING))
758 /* Already received SHUTDOWN from peer, reply with RST */
759 if ((vsk->peer_shutdown & SHUTDOWN_MASK) == SHUTDOWN_MASK) {
760 (void)virtio_transport_reset(vsk, NULL);
764 if ((sk->sk_shutdown & SHUTDOWN_MASK) != SHUTDOWN_MASK)
765 (void)virtio_transport_shutdown(vsk, SHUTDOWN_MASK);
767 if (sock_flag(sk, SOCK_LINGER) && !(current->flags & PF_EXITING))
768 virtio_transport_wait_close(sk, sk->sk_lingertime);
770 if (sock_flag(sk, SOCK_DONE)) {
775 INIT_DELAYED_WORK(&vsk->close_work,
776 virtio_transport_close_timeout);
777 vsk->close_work_scheduled = true;
778 schedule_delayed_work(&vsk->close_work, VSOCK_CLOSE_TIMEOUT);
782 void virtio_transport_release(struct vsock_sock *vsk)
784 struct sock *sk = &vsk->sk;
785 bool remove_sock = true;
788 if (sk->sk_type == SOCK_STREAM)
789 remove_sock = virtio_transport_close(vsk);
793 vsock_remove_sock(vsk);
795 EXPORT_SYMBOL_GPL(virtio_transport_release);
798 virtio_transport_recv_connecting(struct sock *sk,
799 struct virtio_vsock_pkt *pkt)
801 struct vsock_sock *vsk = vsock_sk(sk);
805 switch (le16_to_cpu(pkt->hdr.op)) {
806 case VIRTIO_VSOCK_OP_RESPONSE:
807 sk->sk_state = SS_CONNECTED;
808 sk->sk_socket->state = SS_CONNECTED;
809 vsock_insert_connected(vsk);
810 sk->sk_state_change(sk);
812 case VIRTIO_VSOCK_OP_INVALID:
814 case VIRTIO_VSOCK_OP_RST:
826 virtio_transport_reset(vsk, pkt);
827 sk->sk_state = SS_UNCONNECTED;
829 sk->sk_error_report(sk);
834 virtio_transport_recv_connected(struct sock *sk,
835 struct virtio_vsock_pkt *pkt)
837 struct vsock_sock *vsk = vsock_sk(sk);
838 struct virtio_vsock_sock *vvs = vsk->trans;
841 switch (le16_to_cpu(pkt->hdr.op)) {
842 case VIRTIO_VSOCK_OP_RW:
843 pkt->len = le32_to_cpu(pkt->hdr.len);
846 spin_lock_bh(&vvs->rx_lock);
847 virtio_transport_inc_rx_pkt(vvs, pkt);
848 list_add_tail(&pkt->list, &vvs->rx_queue);
849 spin_unlock_bh(&vvs->rx_lock);
851 sk->sk_data_ready(sk);
853 case VIRTIO_VSOCK_OP_CREDIT_UPDATE:
854 sk->sk_write_space(sk);
856 case VIRTIO_VSOCK_OP_SHUTDOWN:
857 if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SHUTDOWN_RCV)
858 vsk->peer_shutdown |= RCV_SHUTDOWN;
859 if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SHUTDOWN_SEND)
860 vsk->peer_shutdown |= SEND_SHUTDOWN;
861 if (vsk->peer_shutdown == SHUTDOWN_MASK &&
862 vsock_stream_has_data(vsk) <= 0)
863 sk->sk_state = SS_DISCONNECTING;
864 if (le32_to_cpu(pkt->hdr.flags))
865 sk->sk_state_change(sk);
867 case VIRTIO_VSOCK_OP_RST:
868 virtio_transport_do_close(vsk, true);
875 virtio_transport_free_pkt(pkt);
880 virtio_transport_recv_disconnecting(struct sock *sk,
881 struct virtio_vsock_pkt *pkt)
883 struct vsock_sock *vsk = vsock_sk(sk);
885 if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST)
886 virtio_transport_do_close(vsk, true);
890 virtio_transport_send_response(struct vsock_sock *vsk,
891 struct virtio_vsock_pkt *pkt)
893 struct virtio_vsock_pkt_info info = {
894 .op = VIRTIO_VSOCK_OP_RESPONSE,
895 .type = VIRTIO_VSOCK_TYPE_STREAM,
896 .remote_cid = le64_to_cpu(pkt->hdr.src_cid),
897 .remote_port = le32_to_cpu(pkt->hdr.src_port),
902 return virtio_transport_send_pkt_info(vsk, &info);
905 /* Handle server socket */
907 virtio_transport_recv_listen(struct sock *sk, struct virtio_vsock_pkt *pkt)
909 struct vsock_sock *vsk = vsock_sk(sk);
910 struct vsock_sock *vchild;
913 if (le16_to_cpu(pkt->hdr.op) != VIRTIO_VSOCK_OP_REQUEST) {
914 virtio_transport_reset(vsk, pkt);
918 if (sk_acceptq_is_full(sk)) {
919 virtio_transport_reset(vsk, pkt);
923 child = __vsock_create(sock_net(sk), NULL, sk, GFP_KERNEL,
926 virtio_transport_reset(vsk, pkt);
930 sk->sk_ack_backlog++;
932 lock_sock_nested(child, SINGLE_DEPTH_NESTING);
934 child->sk_state = SS_CONNECTED;
936 vchild = vsock_sk(child);
937 vsock_addr_init(&vchild->local_addr, le64_to_cpu(pkt->hdr.dst_cid),
938 le32_to_cpu(pkt->hdr.dst_port));
939 vsock_addr_init(&vchild->remote_addr, le64_to_cpu(pkt->hdr.src_cid),
940 le32_to_cpu(pkt->hdr.src_port));
942 vsock_insert_connected(vchild);
943 vsock_enqueue_accept(sk, child);
944 virtio_transport_send_response(vchild, pkt);
948 sk->sk_data_ready(sk);
952 static bool virtio_transport_space_update(struct sock *sk,
953 struct virtio_vsock_pkt *pkt)
955 struct vsock_sock *vsk = vsock_sk(sk);
956 struct virtio_vsock_sock *vvs = vsk->trans;
957 bool space_available;
959 /* buf_alloc and fwd_cnt is always included in the hdr */
960 spin_lock_bh(&vvs->tx_lock);
961 vvs->peer_buf_alloc = le32_to_cpu(pkt->hdr.buf_alloc);
962 vvs->peer_fwd_cnt = le32_to_cpu(pkt->hdr.fwd_cnt);
963 space_available = virtio_transport_has_space(vsk);
964 spin_unlock_bh(&vvs->tx_lock);
965 return space_available;
968 /* We are under the virtio-vsock's vsock->rx_lock or vhost-vsock's vq->mutex
971 void virtio_transport_recv_pkt(struct virtio_vsock_pkt *pkt)
973 struct sockaddr_vm src, dst;
974 struct vsock_sock *vsk;
976 bool space_available;
978 vsock_addr_init(&src, le64_to_cpu(pkt->hdr.src_cid),
979 le32_to_cpu(pkt->hdr.src_port));
980 vsock_addr_init(&dst, le64_to_cpu(pkt->hdr.dst_cid),
981 le32_to_cpu(pkt->hdr.dst_port));
983 trace_virtio_transport_recv_pkt(src.svm_cid, src.svm_port,
984 dst.svm_cid, dst.svm_port,
985 le32_to_cpu(pkt->hdr.len),
986 le16_to_cpu(pkt->hdr.type),
987 le16_to_cpu(pkt->hdr.op),
988 le32_to_cpu(pkt->hdr.flags),
989 le32_to_cpu(pkt->hdr.buf_alloc),
990 le32_to_cpu(pkt->hdr.fwd_cnt));
992 if (le16_to_cpu(pkt->hdr.type) != VIRTIO_VSOCK_TYPE_STREAM) {
993 (void)virtio_transport_reset_no_sock(pkt);
997 /* The socket must be in connected or bound table
998 * otherwise send reset back
1000 sk = vsock_find_connected_socket(&src, &dst);
1002 sk = vsock_find_bound_socket(&dst);
1004 (void)virtio_transport_reset_no_sock(pkt);
1011 space_available = virtio_transport_space_update(sk, pkt);
1015 /* Update CID in case it has changed after a transport reset event */
1016 vsk->local_addr.svm_cid = dst.svm_cid;
1018 if (space_available)
1019 sk->sk_write_space(sk);
1021 switch (sk->sk_state) {
1022 case VSOCK_SS_LISTEN:
1023 virtio_transport_recv_listen(sk, pkt);
1024 virtio_transport_free_pkt(pkt);
1027 virtio_transport_recv_connecting(sk, pkt);
1028 virtio_transport_free_pkt(pkt);
1031 virtio_transport_recv_connected(sk, pkt);
1033 case SS_DISCONNECTING:
1034 virtio_transport_recv_disconnecting(sk, pkt);
1035 virtio_transport_free_pkt(pkt);
1038 virtio_transport_free_pkt(pkt);
1043 /* Release refcnt obtained when we fetched this socket out of the
1044 * bound or connected list.
1050 virtio_transport_free_pkt(pkt);
1052 EXPORT_SYMBOL_GPL(virtio_transport_recv_pkt);
1054 void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt)
1059 EXPORT_SYMBOL_GPL(virtio_transport_free_pkt);
1061 MODULE_LICENSE("GPL v2");
1062 MODULE_AUTHOR("Asias He");
1063 MODULE_DESCRIPTION("common code for virtio vsock");