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 struct af_vsockmon_hdr *hdr;
98 /* A packet could be split to fit the RX buffer, so we can retrieve
99 * the payload length from the header and the buffer pointer taking
100 * care of the offset in the original packet.
102 payload_len = le32_to_cpu(pkt->hdr.len);
103 payload_buf = pkt->buf + pkt->off;
105 skb = alloc_skb(sizeof(*hdr) + sizeof(pkt->hdr) + payload_len,
110 hdr = skb_put(skb, sizeof(*hdr));
112 /* pkt->hdr is little-endian so no need to byteswap here */
113 hdr->src_cid = pkt->hdr.src_cid;
114 hdr->src_port = pkt->hdr.src_port;
115 hdr->dst_cid = pkt->hdr.dst_cid;
116 hdr->dst_port = pkt->hdr.dst_port;
118 hdr->transport = cpu_to_le16(AF_VSOCK_TRANSPORT_VIRTIO);
119 hdr->len = cpu_to_le16(sizeof(pkt->hdr));
120 memset(hdr->reserved, 0, sizeof(hdr->reserved));
122 switch (le16_to_cpu(pkt->hdr.op)) {
123 case VIRTIO_VSOCK_OP_REQUEST:
124 case VIRTIO_VSOCK_OP_RESPONSE:
125 hdr->op = cpu_to_le16(AF_VSOCK_OP_CONNECT);
127 case VIRTIO_VSOCK_OP_RST:
128 case VIRTIO_VSOCK_OP_SHUTDOWN:
129 hdr->op = cpu_to_le16(AF_VSOCK_OP_DISCONNECT);
131 case VIRTIO_VSOCK_OP_RW:
132 hdr->op = cpu_to_le16(AF_VSOCK_OP_PAYLOAD);
134 case VIRTIO_VSOCK_OP_CREDIT_UPDATE:
135 case VIRTIO_VSOCK_OP_CREDIT_REQUEST:
136 hdr->op = cpu_to_le16(AF_VSOCK_OP_CONTROL);
139 hdr->op = cpu_to_le16(AF_VSOCK_OP_UNKNOWN);
143 skb_put_data(skb, &pkt->hdr, sizeof(pkt->hdr));
146 skb_put_data(skb, payload_buf, payload_len);
152 void virtio_transport_deliver_tap_pkt(struct virtio_vsock_pkt *pkt)
154 vsock_deliver_tap(virtio_transport_build_skb, pkt);
156 EXPORT_SYMBOL_GPL(virtio_transport_deliver_tap_pkt);
158 static int virtio_transport_send_pkt_info(struct vsock_sock *vsk,
159 struct virtio_vsock_pkt_info *info)
161 u32 src_cid, src_port, dst_cid, dst_port;
162 struct virtio_vsock_sock *vvs;
163 struct virtio_vsock_pkt *pkt;
164 u32 pkt_len = info->pkt_len;
166 src_cid = vm_sockets_get_local_cid();
167 src_port = vsk->local_addr.svm_port;
168 if (!info->remote_cid) {
169 dst_cid = vsk->remote_addr.svm_cid;
170 dst_port = vsk->remote_addr.svm_port;
172 dst_cid = info->remote_cid;
173 dst_port = info->remote_port;
178 /* we can send less than pkt_len bytes */
179 if (pkt_len > VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE)
180 pkt_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE;
182 /* virtio_transport_get_credit might return less than pkt_len credit */
183 pkt_len = virtio_transport_get_credit(vvs, pkt_len);
185 /* Do not send zero length OP_RW pkt */
186 if (pkt_len == 0 && info->op == VIRTIO_VSOCK_OP_RW)
189 pkt = virtio_transport_alloc_pkt(info, pkt_len,
193 virtio_transport_put_credit(vvs, pkt_len);
197 virtio_transport_inc_tx_pkt(vvs, pkt);
199 return virtio_transport_get_ops()->send_pkt(pkt);
202 static void virtio_transport_inc_rx_pkt(struct virtio_vsock_sock *vvs,
203 struct virtio_vsock_pkt *pkt)
205 vvs->rx_bytes += pkt->len;
208 static void virtio_transport_dec_rx_pkt(struct virtio_vsock_sock *vvs,
209 struct virtio_vsock_pkt *pkt)
211 vvs->rx_bytes -= pkt->len;
212 vvs->fwd_cnt += pkt->len;
215 void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct virtio_vsock_pkt *pkt)
217 spin_lock_bh(&vvs->tx_lock);
218 pkt->hdr.fwd_cnt = cpu_to_le32(vvs->fwd_cnt);
219 pkt->hdr.buf_alloc = cpu_to_le32(vvs->buf_alloc);
220 spin_unlock_bh(&vvs->tx_lock);
222 EXPORT_SYMBOL_GPL(virtio_transport_inc_tx_pkt);
224 u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 credit)
228 spin_lock_bh(&vvs->tx_lock);
229 ret = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt);
233 spin_unlock_bh(&vvs->tx_lock);
237 EXPORT_SYMBOL_GPL(virtio_transport_get_credit);
239 void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit)
241 spin_lock_bh(&vvs->tx_lock);
242 vvs->tx_cnt -= credit;
243 spin_unlock_bh(&vvs->tx_lock);
245 EXPORT_SYMBOL_GPL(virtio_transport_put_credit);
247 static int virtio_transport_send_credit_update(struct vsock_sock *vsk,
249 struct virtio_vsock_hdr *hdr)
251 struct virtio_vsock_pkt_info info = {
252 .op = VIRTIO_VSOCK_OP_CREDIT_UPDATE,
257 return virtio_transport_send_pkt_info(vsk, &info);
261 virtio_transport_stream_do_dequeue(struct vsock_sock *vsk,
265 struct virtio_vsock_sock *vvs = vsk->trans;
266 struct virtio_vsock_pkt *pkt;
267 size_t bytes, total = 0;
270 spin_lock_bh(&vvs->rx_lock);
271 while (total < len && !list_empty(&vvs->rx_queue)) {
272 pkt = list_first_entry(&vvs->rx_queue,
273 struct virtio_vsock_pkt, list);
276 if (bytes > pkt->len - pkt->off)
277 bytes = pkt->len - pkt->off;
279 /* sk_lock is held by caller so no one else can dequeue.
280 * Unlock rx_lock since memcpy_to_msg() may sleep.
282 spin_unlock_bh(&vvs->rx_lock);
284 err = memcpy_to_msg(msg, pkt->buf + pkt->off, bytes);
288 spin_lock_bh(&vvs->rx_lock);
292 if (pkt->off == pkt->len) {
293 virtio_transport_dec_rx_pkt(vvs, pkt);
294 list_del(&pkt->list);
295 virtio_transport_free_pkt(pkt);
298 spin_unlock_bh(&vvs->rx_lock);
300 /* Send a credit pkt to peer */
301 virtio_transport_send_credit_update(vsk, VIRTIO_VSOCK_TYPE_STREAM,
313 virtio_transport_stream_dequeue(struct vsock_sock *vsk,
315 size_t len, int flags)
317 if (flags & MSG_PEEK)
320 return virtio_transport_stream_do_dequeue(vsk, msg, len);
322 EXPORT_SYMBOL_GPL(virtio_transport_stream_dequeue);
325 virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
327 size_t len, int flags)
331 EXPORT_SYMBOL_GPL(virtio_transport_dgram_dequeue);
333 s64 virtio_transport_stream_has_data(struct vsock_sock *vsk)
335 struct virtio_vsock_sock *vvs = vsk->trans;
338 spin_lock_bh(&vvs->rx_lock);
339 bytes = vvs->rx_bytes;
340 spin_unlock_bh(&vvs->rx_lock);
344 EXPORT_SYMBOL_GPL(virtio_transport_stream_has_data);
346 static s64 virtio_transport_has_space(struct vsock_sock *vsk)
348 struct virtio_vsock_sock *vvs = vsk->trans;
351 bytes = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt);
358 s64 virtio_transport_stream_has_space(struct vsock_sock *vsk)
360 struct virtio_vsock_sock *vvs = vsk->trans;
363 spin_lock_bh(&vvs->tx_lock);
364 bytes = virtio_transport_has_space(vsk);
365 spin_unlock_bh(&vvs->tx_lock);
369 EXPORT_SYMBOL_GPL(virtio_transport_stream_has_space);
371 int virtio_transport_do_socket_init(struct vsock_sock *vsk,
372 struct vsock_sock *psk)
374 struct virtio_vsock_sock *vvs;
376 vvs = kzalloc(sizeof(*vvs), GFP_KERNEL);
383 struct virtio_vsock_sock *ptrans = psk->trans;
385 vvs->buf_size = ptrans->buf_size;
386 vvs->buf_size_min = ptrans->buf_size_min;
387 vvs->buf_size_max = ptrans->buf_size_max;
388 vvs->peer_buf_alloc = ptrans->peer_buf_alloc;
390 vvs->buf_size = VIRTIO_VSOCK_DEFAULT_BUF_SIZE;
391 vvs->buf_size_min = VIRTIO_VSOCK_DEFAULT_MIN_BUF_SIZE;
392 vvs->buf_size_max = VIRTIO_VSOCK_DEFAULT_MAX_BUF_SIZE;
395 vvs->buf_alloc = vvs->buf_size;
397 spin_lock_init(&vvs->rx_lock);
398 spin_lock_init(&vvs->tx_lock);
399 INIT_LIST_HEAD(&vvs->rx_queue);
403 EXPORT_SYMBOL_GPL(virtio_transport_do_socket_init);
405 u64 virtio_transport_get_buffer_size(struct vsock_sock *vsk)
407 struct virtio_vsock_sock *vvs = vsk->trans;
409 return vvs->buf_size;
411 EXPORT_SYMBOL_GPL(virtio_transport_get_buffer_size);
413 u64 virtio_transport_get_min_buffer_size(struct vsock_sock *vsk)
415 struct virtio_vsock_sock *vvs = vsk->trans;
417 return vvs->buf_size_min;
419 EXPORT_SYMBOL_GPL(virtio_transport_get_min_buffer_size);
421 u64 virtio_transport_get_max_buffer_size(struct vsock_sock *vsk)
423 struct virtio_vsock_sock *vvs = vsk->trans;
425 return vvs->buf_size_max;
427 EXPORT_SYMBOL_GPL(virtio_transport_get_max_buffer_size);
429 void virtio_transport_set_buffer_size(struct vsock_sock *vsk, u64 val)
431 struct virtio_vsock_sock *vvs = vsk->trans;
433 if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
434 val = VIRTIO_VSOCK_MAX_BUF_SIZE;
435 if (val < vvs->buf_size_min)
436 vvs->buf_size_min = val;
437 if (val > vvs->buf_size_max)
438 vvs->buf_size_max = val;
440 vvs->buf_alloc = val;
442 EXPORT_SYMBOL_GPL(virtio_transport_set_buffer_size);
444 void virtio_transport_set_min_buffer_size(struct vsock_sock *vsk, u64 val)
446 struct virtio_vsock_sock *vvs = vsk->trans;
448 if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
449 val = VIRTIO_VSOCK_MAX_BUF_SIZE;
450 if (val > vvs->buf_size)
452 vvs->buf_size_min = val;
454 EXPORT_SYMBOL_GPL(virtio_transport_set_min_buffer_size);
456 void virtio_transport_set_max_buffer_size(struct vsock_sock *vsk, u64 val)
458 struct virtio_vsock_sock *vvs = vsk->trans;
460 if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
461 val = VIRTIO_VSOCK_MAX_BUF_SIZE;
462 if (val < vvs->buf_size)
464 vvs->buf_size_max = val;
466 EXPORT_SYMBOL_GPL(virtio_transport_set_max_buffer_size);
469 virtio_transport_notify_poll_in(struct vsock_sock *vsk,
471 bool *data_ready_now)
473 if (vsock_stream_has_data(vsk))
474 *data_ready_now = true;
476 *data_ready_now = false;
480 EXPORT_SYMBOL_GPL(virtio_transport_notify_poll_in);
483 virtio_transport_notify_poll_out(struct vsock_sock *vsk,
485 bool *space_avail_now)
489 free_space = vsock_stream_has_space(vsk);
491 *space_avail_now = true;
492 else if (free_space == 0)
493 *space_avail_now = false;
497 EXPORT_SYMBOL_GPL(virtio_transport_notify_poll_out);
499 int virtio_transport_notify_recv_init(struct vsock_sock *vsk,
500 size_t target, struct vsock_transport_recv_notify_data *data)
504 EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_init);
506 int virtio_transport_notify_recv_pre_block(struct vsock_sock *vsk,
507 size_t target, struct vsock_transport_recv_notify_data *data)
511 EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_pre_block);
513 int virtio_transport_notify_recv_pre_dequeue(struct vsock_sock *vsk,
514 size_t target, struct vsock_transport_recv_notify_data *data)
518 EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_pre_dequeue);
520 int virtio_transport_notify_recv_post_dequeue(struct vsock_sock *vsk,
521 size_t target, ssize_t copied, bool data_read,
522 struct vsock_transport_recv_notify_data *data)
526 EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_post_dequeue);
528 int virtio_transport_notify_send_init(struct vsock_sock *vsk,
529 struct vsock_transport_send_notify_data *data)
533 EXPORT_SYMBOL_GPL(virtio_transport_notify_send_init);
535 int virtio_transport_notify_send_pre_block(struct vsock_sock *vsk,
536 struct vsock_transport_send_notify_data *data)
540 EXPORT_SYMBOL_GPL(virtio_transport_notify_send_pre_block);
542 int virtio_transport_notify_send_pre_enqueue(struct vsock_sock *vsk,
543 struct vsock_transport_send_notify_data *data)
547 EXPORT_SYMBOL_GPL(virtio_transport_notify_send_pre_enqueue);
549 int virtio_transport_notify_send_post_enqueue(struct vsock_sock *vsk,
550 ssize_t written, struct vsock_transport_send_notify_data *data)
554 EXPORT_SYMBOL_GPL(virtio_transport_notify_send_post_enqueue);
556 u64 virtio_transport_stream_rcvhiwat(struct vsock_sock *vsk)
558 struct virtio_vsock_sock *vvs = vsk->trans;
560 return vvs->buf_size;
562 EXPORT_SYMBOL_GPL(virtio_transport_stream_rcvhiwat);
564 bool virtio_transport_stream_is_active(struct vsock_sock *vsk)
568 EXPORT_SYMBOL_GPL(virtio_transport_stream_is_active);
570 bool virtio_transport_stream_allow(u32 cid, u32 port)
574 EXPORT_SYMBOL_GPL(virtio_transport_stream_allow);
576 int virtio_transport_dgram_bind(struct vsock_sock *vsk,
577 struct sockaddr_vm *addr)
581 EXPORT_SYMBOL_GPL(virtio_transport_dgram_bind);
583 bool virtio_transport_dgram_allow(u32 cid, u32 port)
587 EXPORT_SYMBOL_GPL(virtio_transport_dgram_allow);
589 int virtio_transport_connect(struct vsock_sock *vsk)
591 struct virtio_vsock_pkt_info info = {
592 .op = VIRTIO_VSOCK_OP_REQUEST,
593 .type = VIRTIO_VSOCK_TYPE_STREAM,
597 return virtio_transport_send_pkt_info(vsk, &info);
599 EXPORT_SYMBOL_GPL(virtio_transport_connect);
601 int virtio_transport_shutdown(struct vsock_sock *vsk, int mode)
603 struct virtio_vsock_pkt_info info = {
604 .op = VIRTIO_VSOCK_OP_SHUTDOWN,
605 .type = VIRTIO_VSOCK_TYPE_STREAM,
606 .flags = (mode & RCV_SHUTDOWN ?
607 VIRTIO_VSOCK_SHUTDOWN_RCV : 0) |
608 (mode & SEND_SHUTDOWN ?
609 VIRTIO_VSOCK_SHUTDOWN_SEND : 0),
613 return virtio_transport_send_pkt_info(vsk, &info);
615 EXPORT_SYMBOL_GPL(virtio_transport_shutdown);
618 virtio_transport_dgram_enqueue(struct vsock_sock *vsk,
619 struct sockaddr_vm *remote_addr,
625 EXPORT_SYMBOL_GPL(virtio_transport_dgram_enqueue);
628 virtio_transport_stream_enqueue(struct vsock_sock *vsk,
632 struct virtio_vsock_pkt_info info = {
633 .op = VIRTIO_VSOCK_OP_RW,
634 .type = VIRTIO_VSOCK_TYPE_STREAM,
640 return virtio_transport_send_pkt_info(vsk, &info);
642 EXPORT_SYMBOL_GPL(virtio_transport_stream_enqueue);
644 void virtio_transport_destruct(struct vsock_sock *vsk)
646 struct virtio_vsock_sock *vvs = vsk->trans;
650 EXPORT_SYMBOL_GPL(virtio_transport_destruct);
652 static int virtio_transport_reset(struct vsock_sock *vsk,
653 struct virtio_vsock_pkt *pkt)
655 struct virtio_vsock_pkt_info info = {
656 .op = VIRTIO_VSOCK_OP_RST,
657 .type = VIRTIO_VSOCK_TYPE_STREAM,
662 /* Send RST only if the original pkt is not a RST pkt */
663 if (pkt && le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST)
666 return virtio_transport_send_pkt_info(vsk, &info);
669 /* Normally packets are associated with a socket. There may be no socket if an
670 * attempt was made to connect to a socket that does not exist.
672 static int virtio_transport_reset_no_sock(const struct virtio_transport *t,
673 struct virtio_vsock_pkt *pkt)
675 struct virtio_vsock_pkt *reply;
676 struct virtio_vsock_pkt_info info = {
677 .op = VIRTIO_VSOCK_OP_RST,
678 .type = le16_to_cpu(pkt->hdr.type),
682 /* Send RST only if the original pkt is not a RST pkt */
683 if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST)
686 reply = virtio_transport_alloc_pkt(&info, 0,
687 le64_to_cpu(pkt->hdr.dst_cid),
688 le32_to_cpu(pkt->hdr.dst_port),
689 le64_to_cpu(pkt->hdr.src_cid),
690 le32_to_cpu(pkt->hdr.src_port));
695 virtio_transport_free_pkt(reply);
699 return t->send_pkt(reply);
702 static void virtio_transport_wait_close(struct sock *sk, long timeout)
705 DEFINE_WAIT_FUNC(wait, woken_wake_function);
707 add_wait_queue(sk_sleep(sk), &wait);
710 if (sk_wait_event(sk, &timeout,
711 sock_flag(sk, SOCK_DONE), &wait))
713 } while (!signal_pending(current) && timeout);
715 remove_wait_queue(sk_sleep(sk), &wait);
719 static void virtio_transport_do_close(struct vsock_sock *vsk,
722 struct sock *sk = sk_vsock(vsk);
724 sock_set_flag(sk, SOCK_DONE);
725 vsk->peer_shutdown = SHUTDOWN_MASK;
726 if (vsock_stream_has_data(vsk) <= 0)
727 sk->sk_state = TCP_CLOSING;
728 sk->sk_state_change(sk);
730 if (vsk->close_work_scheduled &&
731 (!cancel_timeout || cancel_delayed_work(&vsk->close_work))) {
732 vsk->close_work_scheduled = false;
734 vsock_remove_sock(vsk);
736 /* Release refcnt obtained when we scheduled the timeout */
741 static void virtio_transport_close_timeout(struct work_struct *work)
743 struct vsock_sock *vsk =
744 container_of(work, struct vsock_sock, close_work.work);
745 struct sock *sk = sk_vsock(vsk);
750 if (!sock_flag(sk, SOCK_DONE)) {
751 (void)virtio_transport_reset(vsk, NULL);
753 virtio_transport_do_close(vsk, false);
756 vsk->close_work_scheduled = false;
762 /* User context, vsk->sk is locked */
763 static bool virtio_transport_close(struct vsock_sock *vsk)
765 struct sock *sk = &vsk->sk;
767 if (!(sk->sk_state == TCP_ESTABLISHED ||
768 sk->sk_state == TCP_CLOSING))
771 /* Already received SHUTDOWN from peer, reply with RST */
772 if ((vsk->peer_shutdown & SHUTDOWN_MASK) == SHUTDOWN_MASK) {
773 (void)virtio_transport_reset(vsk, NULL);
777 if ((sk->sk_shutdown & SHUTDOWN_MASK) != SHUTDOWN_MASK)
778 (void)virtio_transport_shutdown(vsk, SHUTDOWN_MASK);
780 if (sock_flag(sk, SOCK_LINGER) && !(current->flags & PF_EXITING))
781 virtio_transport_wait_close(sk, sk->sk_lingertime);
783 if (sock_flag(sk, SOCK_DONE)) {
788 INIT_DELAYED_WORK(&vsk->close_work,
789 virtio_transport_close_timeout);
790 vsk->close_work_scheduled = true;
791 schedule_delayed_work(&vsk->close_work, VSOCK_CLOSE_TIMEOUT);
795 void virtio_transport_release(struct vsock_sock *vsk)
797 struct virtio_vsock_sock *vvs = vsk->trans;
798 struct virtio_vsock_pkt *pkt, *tmp;
799 struct sock *sk = &vsk->sk;
800 bool remove_sock = true;
802 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
803 if (sk->sk_type == SOCK_STREAM)
804 remove_sock = virtio_transport_close(vsk);
806 list_for_each_entry_safe(pkt, tmp, &vvs->rx_queue, list) {
807 list_del(&pkt->list);
808 virtio_transport_free_pkt(pkt);
813 vsock_remove_sock(vsk);
815 EXPORT_SYMBOL_GPL(virtio_transport_release);
818 virtio_transport_recv_connecting(struct sock *sk,
819 struct virtio_vsock_pkt *pkt)
821 struct vsock_sock *vsk = vsock_sk(sk);
825 switch (le16_to_cpu(pkt->hdr.op)) {
826 case VIRTIO_VSOCK_OP_RESPONSE:
827 sk->sk_state = TCP_ESTABLISHED;
828 sk->sk_socket->state = SS_CONNECTED;
829 vsock_insert_connected(vsk);
830 sk->sk_state_change(sk);
832 case VIRTIO_VSOCK_OP_INVALID:
834 case VIRTIO_VSOCK_OP_RST:
846 virtio_transport_reset(vsk, pkt);
847 sk->sk_state = TCP_CLOSE;
849 sk->sk_error_report(sk);
854 virtio_transport_recv_connected(struct sock *sk,
855 struct virtio_vsock_pkt *pkt)
857 struct vsock_sock *vsk = vsock_sk(sk);
858 struct virtio_vsock_sock *vvs = vsk->trans;
861 switch (le16_to_cpu(pkt->hdr.op)) {
862 case VIRTIO_VSOCK_OP_RW:
863 pkt->len = le32_to_cpu(pkt->hdr.len);
866 spin_lock_bh(&vvs->rx_lock);
867 virtio_transport_inc_rx_pkt(vvs, pkt);
868 list_add_tail(&pkt->list, &vvs->rx_queue);
869 spin_unlock_bh(&vvs->rx_lock);
871 sk->sk_data_ready(sk);
873 case VIRTIO_VSOCK_OP_CREDIT_UPDATE:
874 sk->sk_write_space(sk);
876 case VIRTIO_VSOCK_OP_SHUTDOWN:
877 if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SHUTDOWN_RCV)
878 vsk->peer_shutdown |= RCV_SHUTDOWN;
879 if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SHUTDOWN_SEND)
880 vsk->peer_shutdown |= SEND_SHUTDOWN;
881 if (vsk->peer_shutdown == SHUTDOWN_MASK &&
882 vsock_stream_has_data(vsk) <= 0 &&
883 !sock_flag(sk, SOCK_DONE)) {
884 (void)virtio_transport_reset(vsk, NULL);
886 virtio_transport_do_close(vsk, true);
888 if (le32_to_cpu(pkt->hdr.flags))
889 sk->sk_state_change(sk);
891 case VIRTIO_VSOCK_OP_RST:
892 virtio_transport_do_close(vsk, true);
899 virtio_transport_free_pkt(pkt);
904 virtio_transport_recv_disconnecting(struct sock *sk,
905 struct virtio_vsock_pkt *pkt)
907 struct vsock_sock *vsk = vsock_sk(sk);
909 if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST)
910 virtio_transport_do_close(vsk, true);
914 virtio_transport_send_response(struct vsock_sock *vsk,
915 struct virtio_vsock_pkt *pkt)
917 struct virtio_vsock_pkt_info info = {
918 .op = VIRTIO_VSOCK_OP_RESPONSE,
919 .type = VIRTIO_VSOCK_TYPE_STREAM,
920 .remote_cid = le64_to_cpu(pkt->hdr.src_cid),
921 .remote_port = le32_to_cpu(pkt->hdr.src_port),
926 return virtio_transport_send_pkt_info(vsk, &info);
929 /* Handle server socket */
931 virtio_transport_recv_listen(struct sock *sk, struct virtio_vsock_pkt *pkt)
933 struct vsock_sock *vsk = vsock_sk(sk);
934 struct vsock_sock *vchild;
937 if (le16_to_cpu(pkt->hdr.op) != VIRTIO_VSOCK_OP_REQUEST) {
938 virtio_transport_reset(vsk, pkt);
942 if (sk_acceptq_is_full(sk)) {
943 virtio_transport_reset(vsk, pkt);
947 child = __vsock_create(sock_net(sk), NULL, sk, GFP_KERNEL,
950 virtio_transport_reset(vsk, pkt);
954 sk->sk_ack_backlog++;
956 lock_sock_nested(child, SINGLE_DEPTH_NESTING);
958 child->sk_state = TCP_ESTABLISHED;
960 vchild = vsock_sk(child);
961 vsock_addr_init(&vchild->local_addr, le64_to_cpu(pkt->hdr.dst_cid),
962 le32_to_cpu(pkt->hdr.dst_port));
963 vsock_addr_init(&vchild->remote_addr, le64_to_cpu(pkt->hdr.src_cid),
964 le32_to_cpu(pkt->hdr.src_port));
966 vsock_insert_connected(vchild);
967 vsock_enqueue_accept(sk, child);
968 virtio_transport_send_response(vchild, pkt);
972 sk->sk_data_ready(sk);
976 static bool virtio_transport_space_update(struct sock *sk,
977 struct virtio_vsock_pkt *pkt)
979 struct vsock_sock *vsk = vsock_sk(sk);
980 struct virtio_vsock_sock *vvs = vsk->trans;
981 bool space_available;
983 /* buf_alloc and fwd_cnt is always included in the hdr */
984 spin_lock_bh(&vvs->tx_lock);
985 vvs->peer_buf_alloc = le32_to_cpu(pkt->hdr.buf_alloc);
986 vvs->peer_fwd_cnt = le32_to_cpu(pkt->hdr.fwd_cnt);
987 space_available = virtio_transport_has_space(vsk);
988 spin_unlock_bh(&vvs->tx_lock);
989 return space_available;
992 /* We are under the virtio-vsock's vsock->rx_lock or vhost-vsock's vq->mutex
995 void virtio_transport_recv_pkt(struct virtio_transport *t,
996 struct virtio_vsock_pkt *pkt)
998 struct sockaddr_vm src, dst;
999 struct vsock_sock *vsk;
1001 bool space_available;
1003 vsock_addr_init(&src, le64_to_cpu(pkt->hdr.src_cid),
1004 le32_to_cpu(pkt->hdr.src_port));
1005 vsock_addr_init(&dst, le64_to_cpu(pkt->hdr.dst_cid),
1006 le32_to_cpu(pkt->hdr.dst_port));
1008 trace_virtio_transport_recv_pkt(src.svm_cid, src.svm_port,
1009 dst.svm_cid, dst.svm_port,
1010 le32_to_cpu(pkt->hdr.len),
1011 le16_to_cpu(pkt->hdr.type),
1012 le16_to_cpu(pkt->hdr.op),
1013 le32_to_cpu(pkt->hdr.flags),
1014 le32_to_cpu(pkt->hdr.buf_alloc),
1015 le32_to_cpu(pkt->hdr.fwd_cnt));
1017 if (le16_to_cpu(pkt->hdr.type) != VIRTIO_VSOCK_TYPE_STREAM) {
1018 (void)virtio_transport_reset_no_sock(t, pkt);
1022 /* The socket must be in connected or bound table
1023 * otherwise send reset back
1025 sk = vsock_find_connected_socket(&src, &dst);
1027 sk = vsock_find_bound_socket(&dst);
1029 (void)virtio_transport_reset_no_sock(t, pkt);
1038 space_available = virtio_transport_space_update(sk, pkt);
1040 /* Update CID in case it has changed after a transport reset event */
1041 vsk->local_addr.svm_cid = dst.svm_cid;
1043 if (space_available)
1044 sk->sk_write_space(sk);
1046 switch (sk->sk_state) {
1048 virtio_transport_recv_listen(sk, pkt);
1049 virtio_transport_free_pkt(pkt);
1052 virtio_transport_recv_connecting(sk, pkt);
1053 virtio_transport_free_pkt(pkt);
1055 case TCP_ESTABLISHED:
1056 virtio_transport_recv_connected(sk, pkt);
1059 virtio_transport_recv_disconnecting(sk, pkt);
1060 virtio_transport_free_pkt(pkt);
1063 (void)virtio_transport_reset_no_sock(t, pkt);
1064 virtio_transport_free_pkt(pkt);
1069 /* Release refcnt obtained when we fetched this socket out of the
1070 * bound or connected list.
1076 virtio_transport_free_pkt(pkt);
1078 EXPORT_SYMBOL_GPL(virtio_transport_recv_pkt);
1080 void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt)
1085 EXPORT_SYMBOL_GPL(virtio_transport_free_pkt);
1087 MODULE_LICENSE("GPL v2");
1088 MODULE_AUTHOR("Asias He");
1089 MODULE_DESCRIPTION("common code for virtio vsock");