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2f184393e0
Several cases of overlapping changes which were for the most part trivially resolvable. Signed-off-by: David S. Miller <davem@davemloft.net>
1203 lines
29 KiB
C
1203 lines
29 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* common code for virtio vsock
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*
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* Copyright (C) 2013-2015 Red Hat, Inc.
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* Author: Asias He <asias@redhat.com>
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* Stefan Hajnoczi <stefanha@redhat.com>
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*/
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#include <linux/spinlock.h>
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#include <linux/module.h>
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#include <linux/sched/signal.h>
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#include <linux/ctype.h>
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#include <linux/list.h>
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#include <linux/virtio.h>
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#include <linux/virtio_ids.h>
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#include <linux/virtio_config.h>
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#include <linux/virtio_vsock.h>
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#include <uapi/linux/vsockmon.h>
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#include <net/sock.h>
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#include <net/af_vsock.h>
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#define CREATE_TRACE_POINTS
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#include <trace/events/vsock_virtio_transport_common.h>
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/* How long to wait for graceful shutdown of a connection */
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#define VSOCK_CLOSE_TIMEOUT (8 * HZ)
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/* Threshold for detecting small packets to copy */
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#define GOOD_COPY_LEN 128
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static const struct virtio_transport *virtio_transport_get_ops(void)
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{
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const struct vsock_transport *t = vsock_core_get_transport();
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return container_of(t, struct virtio_transport, transport);
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}
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static struct virtio_vsock_pkt *
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virtio_transport_alloc_pkt(struct virtio_vsock_pkt_info *info,
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size_t len,
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u32 src_cid,
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u32 src_port,
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u32 dst_cid,
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u32 dst_port)
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{
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struct virtio_vsock_pkt *pkt;
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int err;
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pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
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if (!pkt)
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return NULL;
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pkt->hdr.type = cpu_to_le16(info->type);
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pkt->hdr.op = cpu_to_le16(info->op);
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pkt->hdr.src_cid = cpu_to_le64(src_cid);
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pkt->hdr.dst_cid = cpu_to_le64(dst_cid);
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pkt->hdr.src_port = cpu_to_le32(src_port);
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pkt->hdr.dst_port = cpu_to_le32(dst_port);
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pkt->hdr.flags = cpu_to_le32(info->flags);
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pkt->len = len;
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pkt->hdr.len = cpu_to_le32(len);
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pkt->reply = info->reply;
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pkt->vsk = info->vsk;
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if (info->msg && len > 0) {
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pkt->buf = kmalloc(len, GFP_KERNEL);
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if (!pkt->buf)
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goto out_pkt;
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pkt->buf_len = len;
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err = memcpy_from_msg(pkt->buf, info->msg, len);
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if (err)
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goto out;
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}
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trace_virtio_transport_alloc_pkt(src_cid, src_port,
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dst_cid, dst_port,
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len,
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info->type,
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info->op,
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info->flags);
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return pkt;
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out:
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kfree(pkt->buf);
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out_pkt:
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kfree(pkt);
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return NULL;
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}
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/* Packet capture */
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static struct sk_buff *virtio_transport_build_skb(void *opaque)
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{
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struct virtio_vsock_pkt *pkt = opaque;
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struct af_vsockmon_hdr *hdr;
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struct sk_buff *skb;
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size_t payload_len;
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void *payload_buf;
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/* A packet could be split to fit the RX buffer, so we can retrieve
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* the payload length from the header and the buffer pointer taking
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* care of the offset in the original packet.
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*/
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payload_len = le32_to_cpu(pkt->hdr.len);
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payload_buf = pkt->buf + pkt->off;
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skb = alloc_skb(sizeof(*hdr) + sizeof(pkt->hdr) + payload_len,
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GFP_ATOMIC);
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if (!skb)
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return NULL;
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hdr = skb_put(skb, sizeof(*hdr));
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/* pkt->hdr is little-endian so no need to byteswap here */
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hdr->src_cid = pkt->hdr.src_cid;
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hdr->src_port = pkt->hdr.src_port;
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hdr->dst_cid = pkt->hdr.dst_cid;
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hdr->dst_port = pkt->hdr.dst_port;
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hdr->transport = cpu_to_le16(AF_VSOCK_TRANSPORT_VIRTIO);
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hdr->len = cpu_to_le16(sizeof(pkt->hdr));
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memset(hdr->reserved, 0, sizeof(hdr->reserved));
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switch (le16_to_cpu(pkt->hdr.op)) {
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case VIRTIO_VSOCK_OP_REQUEST:
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case VIRTIO_VSOCK_OP_RESPONSE:
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hdr->op = cpu_to_le16(AF_VSOCK_OP_CONNECT);
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break;
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case VIRTIO_VSOCK_OP_RST:
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case VIRTIO_VSOCK_OP_SHUTDOWN:
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hdr->op = cpu_to_le16(AF_VSOCK_OP_DISCONNECT);
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break;
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case VIRTIO_VSOCK_OP_RW:
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hdr->op = cpu_to_le16(AF_VSOCK_OP_PAYLOAD);
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break;
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case VIRTIO_VSOCK_OP_CREDIT_UPDATE:
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case VIRTIO_VSOCK_OP_CREDIT_REQUEST:
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hdr->op = cpu_to_le16(AF_VSOCK_OP_CONTROL);
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break;
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default:
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hdr->op = cpu_to_le16(AF_VSOCK_OP_UNKNOWN);
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break;
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}
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skb_put_data(skb, &pkt->hdr, sizeof(pkt->hdr));
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if (payload_len) {
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skb_put_data(skb, payload_buf, payload_len);
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}
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return skb;
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}
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void virtio_transport_deliver_tap_pkt(struct virtio_vsock_pkt *pkt)
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{
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vsock_deliver_tap(virtio_transport_build_skb, pkt);
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}
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EXPORT_SYMBOL_GPL(virtio_transport_deliver_tap_pkt);
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static int virtio_transport_send_pkt_info(struct vsock_sock *vsk,
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struct virtio_vsock_pkt_info *info)
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{
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u32 src_cid, src_port, dst_cid, dst_port;
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struct virtio_vsock_sock *vvs;
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struct virtio_vsock_pkt *pkt;
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u32 pkt_len = info->pkt_len;
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src_cid = vm_sockets_get_local_cid();
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src_port = vsk->local_addr.svm_port;
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if (!info->remote_cid) {
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dst_cid = vsk->remote_addr.svm_cid;
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dst_port = vsk->remote_addr.svm_port;
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} else {
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dst_cid = info->remote_cid;
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dst_port = info->remote_port;
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}
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vvs = vsk->trans;
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/* we can send less than pkt_len bytes */
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if (pkt_len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE)
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pkt_len = VIRTIO_VSOCK_MAX_PKT_BUF_SIZE;
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/* virtio_transport_get_credit might return less than pkt_len credit */
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pkt_len = virtio_transport_get_credit(vvs, pkt_len);
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/* Do not send zero length OP_RW pkt */
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if (pkt_len == 0 && info->op == VIRTIO_VSOCK_OP_RW)
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return pkt_len;
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pkt = virtio_transport_alloc_pkt(info, pkt_len,
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src_cid, src_port,
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dst_cid, dst_port);
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if (!pkt) {
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virtio_transport_put_credit(vvs, pkt_len);
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return -ENOMEM;
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}
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virtio_transport_inc_tx_pkt(vvs, pkt);
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return virtio_transport_get_ops()->send_pkt(pkt);
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}
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static bool virtio_transport_inc_rx_pkt(struct virtio_vsock_sock *vvs,
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struct virtio_vsock_pkt *pkt)
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{
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if (vvs->rx_bytes + pkt->len > vvs->buf_alloc)
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return false;
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vvs->rx_bytes += pkt->len;
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return true;
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}
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static void virtio_transport_dec_rx_pkt(struct virtio_vsock_sock *vvs,
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struct virtio_vsock_pkt *pkt)
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{
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vvs->rx_bytes -= pkt->len;
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vvs->fwd_cnt += pkt->len;
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}
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void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct virtio_vsock_pkt *pkt)
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{
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spin_lock_bh(&vvs->rx_lock);
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vvs->last_fwd_cnt = vvs->fwd_cnt;
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pkt->hdr.fwd_cnt = cpu_to_le32(vvs->fwd_cnt);
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pkt->hdr.buf_alloc = cpu_to_le32(vvs->buf_alloc);
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spin_unlock_bh(&vvs->rx_lock);
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}
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EXPORT_SYMBOL_GPL(virtio_transport_inc_tx_pkt);
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u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 credit)
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{
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u32 ret;
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spin_lock_bh(&vvs->tx_lock);
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ret = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt);
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if (ret > credit)
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ret = credit;
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vvs->tx_cnt += ret;
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spin_unlock_bh(&vvs->tx_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(virtio_transport_get_credit);
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void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit)
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{
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spin_lock_bh(&vvs->tx_lock);
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vvs->tx_cnt -= credit;
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spin_unlock_bh(&vvs->tx_lock);
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}
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EXPORT_SYMBOL_GPL(virtio_transport_put_credit);
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static int virtio_transport_send_credit_update(struct vsock_sock *vsk,
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int type,
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struct virtio_vsock_hdr *hdr)
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{
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struct virtio_vsock_pkt_info info = {
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.op = VIRTIO_VSOCK_OP_CREDIT_UPDATE,
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.type = type,
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.vsk = vsk,
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};
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return virtio_transport_send_pkt_info(vsk, &info);
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}
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static ssize_t
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virtio_transport_stream_do_peek(struct vsock_sock *vsk,
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struct msghdr *msg,
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size_t len)
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{
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struct virtio_vsock_sock *vvs = vsk->trans;
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struct virtio_vsock_pkt *pkt;
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size_t bytes, total = 0, off;
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int err = -EFAULT;
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spin_lock_bh(&vvs->rx_lock);
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list_for_each_entry(pkt, &vvs->rx_queue, list) {
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off = pkt->off;
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if (total == len)
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break;
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while (total < len && off < pkt->len) {
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bytes = len - total;
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if (bytes > pkt->len - off)
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bytes = pkt->len - off;
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/* sk_lock is held by caller so no one else can dequeue.
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* Unlock rx_lock since memcpy_to_msg() may sleep.
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*/
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spin_unlock_bh(&vvs->rx_lock);
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err = memcpy_to_msg(msg, pkt->buf + off, bytes);
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if (err)
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goto out;
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spin_lock_bh(&vvs->rx_lock);
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total += bytes;
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off += bytes;
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}
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}
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spin_unlock_bh(&vvs->rx_lock);
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return total;
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out:
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if (total)
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err = total;
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return err;
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}
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static ssize_t
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virtio_transport_stream_do_dequeue(struct vsock_sock *vsk,
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struct msghdr *msg,
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size_t len)
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{
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struct virtio_vsock_sock *vvs = vsk->trans;
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struct virtio_vsock_pkt *pkt;
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size_t bytes, total = 0;
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u32 free_space;
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int err = -EFAULT;
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spin_lock_bh(&vvs->rx_lock);
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while (total < len && !list_empty(&vvs->rx_queue)) {
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pkt = list_first_entry(&vvs->rx_queue,
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struct virtio_vsock_pkt, list);
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bytes = len - total;
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if (bytes > pkt->len - pkt->off)
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bytes = pkt->len - pkt->off;
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/* sk_lock is held by caller so no one else can dequeue.
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* Unlock rx_lock since memcpy_to_msg() may sleep.
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*/
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spin_unlock_bh(&vvs->rx_lock);
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err = memcpy_to_msg(msg, pkt->buf + pkt->off, bytes);
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if (err)
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goto out;
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spin_lock_bh(&vvs->rx_lock);
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total += bytes;
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pkt->off += bytes;
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if (pkt->off == pkt->len) {
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virtio_transport_dec_rx_pkt(vvs, pkt);
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list_del(&pkt->list);
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virtio_transport_free_pkt(pkt);
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}
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}
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free_space = vvs->buf_alloc - (vvs->fwd_cnt - vvs->last_fwd_cnt);
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spin_unlock_bh(&vvs->rx_lock);
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/* To reduce the number of credit update messages,
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* don't update credits as long as lots of space is available.
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* Note: the limit chosen here is arbitrary. Setting the limit
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* too high causes extra messages. Too low causes transmitter
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* stalls. As stalls are in theory more expensive than extra
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* messages, we set the limit to a high value. TODO: experiment
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* with different values.
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*/
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if (free_space < VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) {
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virtio_transport_send_credit_update(vsk,
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VIRTIO_VSOCK_TYPE_STREAM,
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NULL);
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}
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return total;
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out:
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if (total)
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err = total;
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return err;
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}
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ssize_t
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virtio_transport_stream_dequeue(struct vsock_sock *vsk,
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struct msghdr *msg,
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size_t len, int flags)
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{
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if (flags & MSG_PEEK)
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return virtio_transport_stream_do_peek(vsk, msg, len);
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else
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return virtio_transport_stream_do_dequeue(vsk, msg, len);
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}
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EXPORT_SYMBOL_GPL(virtio_transport_stream_dequeue);
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int
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virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
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struct msghdr *msg,
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size_t len, int flags)
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{
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return -EOPNOTSUPP;
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}
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EXPORT_SYMBOL_GPL(virtio_transport_dgram_dequeue);
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s64 virtio_transport_stream_has_data(struct vsock_sock *vsk)
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{
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struct virtio_vsock_sock *vvs = vsk->trans;
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s64 bytes;
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spin_lock_bh(&vvs->rx_lock);
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bytes = vvs->rx_bytes;
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spin_unlock_bh(&vvs->rx_lock);
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return bytes;
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}
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EXPORT_SYMBOL_GPL(virtio_transport_stream_has_data);
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static s64 virtio_transport_has_space(struct vsock_sock *vsk)
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{
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struct virtio_vsock_sock *vvs = vsk->trans;
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s64 bytes;
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bytes = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt);
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if (bytes < 0)
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bytes = 0;
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return bytes;
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}
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s64 virtio_transport_stream_has_space(struct vsock_sock *vsk)
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{
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struct virtio_vsock_sock *vvs = vsk->trans;
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s64 bytes;
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spin_lock_bh(&vvs->tx_lock);
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bytes = virtio_transport_has_space(vsk);
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spin_unlock_bh(&vvs->tx_lock);
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return bytes;
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}
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EXPORT_SYMBOL_GPL(virtio_transport_stream_has_space);
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int virtio_transport_do_socket_init(struct vsock_sock *vsk,
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struct vsock_sock *psk)
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{
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struct virtio_vsock_sock *vvs;
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vvs = kzalloc(sizeof(*vvs), GFP_KERNEL);
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if (!vvs)
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return -ENOMEM;
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vsk->trans = vvs;
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vvs->vsk = vsk;
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if (psk) {
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struct virtio_vsock_sock *ptrans = psk->trans;
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vvs->buf_size = ptrans->buf_size;
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vvs->buf_size_min = ptrans->buf_size_min;
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vvs->buf_size_max = ptrans->buf_size_max;
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vvs->peer_buf_alloc = ptrans->peer_buf_alloc;
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} else {
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vvs->buf_size = VIRTIO_VSOCK_DEFAULT_BUF_SIZE;
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vvs->buf_size_min = VIRTIO_VSOCK_DEFAULT_MIN_BUF_SIZE;
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vvs->buf_size_max = VIRTIO_VSOCK_DEFAULT_MAX_BUF_SIZE;
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}
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vvs->buf_alloc = vvs->buf_size;
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spin_lock_init(&vvs->rx_lock);
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spin_lock_init(&vvs->tx_lock);
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INIT_LIST_HEAD(&vvs->rx_queue);
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return 0;
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}
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EXPORT_SYMBOL_GPL(virtio_transport_do_socket_init);
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u64 virtio_transport_get_buffer_size(struct vsock_sock *vsk)
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{
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struct virtio_vsock_sock *vvs = vsk->trans;
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return vvs->buf_size;
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}
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EXPORT_SYMBOL_GPL(virtio_transport_get_buffer_size);
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u64 virtio_transport_get_min_buffer_size(struct vsock_sock *vsk)
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{
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struct virtio_vsock_sock *vvs = vsk->trans;
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return vvs->buf_size_min;
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}
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EXPORT_SYMBOL_GPL(virtio_transport_get_min_buffer_size);
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u64 virtio_transport_get_max_buffer_size(struct vsock_sock *vsk)
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{
|
|
struct virtio_vsock_sock *vvs = vsk->trans;
|
|
|
|
return vvs->buf_size_max;
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_get_max_buffer_size);
|
|
|
|
void virtio_transport_set_buffer_size(struct vsock_sock *vsk, u64 val)
|
|
{
|
|
struct virtio_vsock_sock *vvs = vsk->trans;
|
|
|
|
if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
|
|
val = VIRTIO_VSOCK_MAX_BUF_SIZE;
|
|
if (val < vvs->buf_size_min)
|
|
vvs->buf_size_min = val;
|
|
if (val > vvs->buf_size_max)
|
|
vvs->buf_size_max = val;
|
|
vvs->buf_size = val;
|
|
vvs->buf_alloc = val;
|
|
|
|
virtio_transport_send_credit_update(vsk, VIRTIO_VSOCK_TYPE_STREAM,
|
|
NULL);
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_set_buffer_size);
|
|
|
|
void virtio_transport_set_min_buffer_size(struct vsock_sock *vsk, u64 val)
|
|
{
|
|
struct virtio_vsock_sock *vvs = vsk->trans;
|
|
|
|
if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
|
|
val = VIRTIO_VSOCK_MAX_BUF_SIZE;
|
|
if (val > vvs->buf_size)
|
|
vvs->buf_size = val;
|
|
vvs->buf_size_min = val;
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_set_min_buffer_size);
|
|
|
|
void virtio_transport_set_max_buffer_size(struct vsock_sock *vsk, u64 val)
|
|
{
|
|
struct virtio_vsock_sock *vvs = vsk->trans;
|
|
|
|
if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
|
|
val = VIRTIO_VSOCK_MAX_BUF_SIZE;
|
|
if (val < vvs->buf_size)
|
|
vvs->buf_size = val;
|
|
vvs->buf_size_max = val;
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_set_max_buffer_size);
|
|
|
|
int
|
|
virtio_transport_notify_poll_in(struct vsock_sock *vsk,
|
|
size_t target,
|
|
bool *data_ready_now)
|
|
{
|
|
if (vsock_stream_has_data(vsk))
|
|
*data_ready_now = true;
|
|
else
|
|
*data_ready_now = false;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_notify_poll_in);
|
|
|
|
int
|
|
virtio_transport_notify_poll_out(struct vsock_sock *vsk,
|
|
size_t target,
|
|
bool *space_avail_now)
|
|
{
|
|
s64 free_space;
|
|
|
|
free_space = vsock_stream_has_space(vsk);
|
|
if (free_space > 0)
|
|
*space_avail_now = true;
|
|
else if (free_space == 0)
|
|
*space_avail_now = false;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_notify_poll_out);
|
|
|
|
int virtio_transport_notify_recv_init(struct vsock_sock *vsk,
|
|
size_t target, struct vsock_transport_recv_notify_data *data)
|
|
{
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_init);
|
|
|
|
int virtio_transport_notify_recv_pre_block(struct vsock_sock *vsk,
|
|
size_t target, struct vsock_transport_recv_notify_data *data)
|
|
{
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_pre_block);
|
|
|
|
int virtio_transport_notify_recv_pre_dequeue(struct vsock_sock *vsk,
|
|
size_t target, struct vsock_transport_recv_notify_data *data)
|
|
{
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_pre_dequeue);
|
|
|
|
int virtio_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 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_post_dequeue);
|
|
|
|
int virtio_transport_notify_send_init(struct vsock_sock *vsk,
|
|
struct vsock_transport_send_notify_data *data)
|
|
{
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_notify_send_init);
|
|
|
|
int virtio_transport_notify_send_pre_block(struct vsock_sock *vsk,
|
|
struct vsock_transport_send_notify_data *data)
|
|
{
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_notify_send_pre_block);
|
|
|
|
int virtio_transport_notify_send_pre_enqueue(struct vsock_sock *vsk,
|
|
struct vsock_transport_send_notify_data *data)
|
|
{
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_notify_send_pre_enqueue);
|
|
|
|
int virtio_transport_notify_send_post_enqueue(struct vsock_sock *vsk,
|
|
ssize_t written, struct vsock_transport_send_notify_data *data)
|
|
{
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_notify_send_post_enqueue);
|
|
|
|
u64 virtio_transport_stream_rcvhiwat(struct vsock_sock *vsk)
|
|
{
|
|
struct virtio_vsock_sock *vvs = vsk->trans;
|
|
|
|
return vvs->buf_size;
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_stream_rcvhiwat);
|
|
|
|
bool virtio_transport_stream_is_active(struct vsock_sock *vsk)
|
|
{
|
|
return true;
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_stream_is_active);
|
|
|
|
bool virtio_transport_stream_allow(u32 cid, u32 port)
|
|
{
|
|
return true;
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_stream_allow);
|
|
|
|
int virtio_transport_dgram_bind(struct vsock_sock *vsk,
|
|
struct sockaddr_vm *addr)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_dgram_bind);
|
|
|
|
bool virtio_transport_dgram_allow(u32 cid, u32 port)
|
|
{
|
|
return false;
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_dgram_allow);
|
|
|
|
int virtio_transport_connect(struct vsock_sock *vsk)
|
|
{
|
|
struct virtio_vsock_pkt_info info = {
|
|
.op = VIRTIO_VSOCK_OP_REQUEST,
|
|
.type = VIRTIO_VSOCK_TYPE_STREAM,
|
|
.vsk = vsk,
|
|
};
|
|
|
|
return virtio_transport_send_pkt_info(vsk, &info);
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_connect);
|
|
|
|
int virtio_transport_shutdown(struct vsock_sock *vsk, int mode)
|
|
{
|
|
struct virtio_vsock_pkt_info info = {
|
|
.op = VIRTIO_VSOCK_OP_SHUTDOWN,
|
|
.type = VIRTIO_VSOCK_TYPE_STREAM,
|
|
.flags = (mode & RCV_SHUTDOWN ?
|
|
VIRTIO_VSOCK_SHUTDOWN_RCV : 0) |
|
|
(mode & SEND_SHUTDOWN ?
|
|
VIRTIO_VSOCK_SHUTDOWN_SEND : 0),
|
|
.vsk = vsk,
|
|
};
|
|
|
|
return virtio_transport_send_pkt_info(vsk, &info);
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_shutdown);
|
|
|
|
int
|
|
virtio_transport_dgram_enqueue(struct vsock_sock *vsk,
|
|
struct sockaddr_vm *remote_addr,
|
|
struct msghdr *msg,
|
|
size_t dgram_len)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_dgram_enqueue);
|
|
|
|
ssize_t
|
|
virtio_transport_stream_enqueue(struct vsock_sock *vsk,
|
|
struct msghdr *msg,
|
|
size_t len)
|
|
{
|
|
struct virtio_vsock_pkt_info info = {
|
|
.op = VIRTIO_VSOCK_OP_RW,
|
|
.type = VIRTIO_VSOCK_TYPE_STREAM,
|
|
.msg = msg,
|
|
.pkt_len = len,
|
|
.vsk = vsk,
|
|
};
|
|
|
|
return virtio_transport_send_pkt_info(vsk, &info);
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_stream_enqueue);
|
|
|
|
void virtio_transport_destruct(struct vsock_sock *vsk)
|
|
{
|
|
struct virtio_vsock_sock *vvs = vsk->trans;
|
|
|
|
kfree(vvs);
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_destruct);
|
|
|
|
static int virtio_transport_reset(struct vsock_sock *vsk,
|
|
struct virtio_vsock_pkt *pkt)
|
|
{
|
|
struct virtio_vsock_pkt_info info = {
|
|
.op = VIRTIO_VSOCK_OP_RST,
|
|
.type = VIRTIO_VSOCK_TYPE_STREAM,
|
|
.reply = !!pkt,
|
|
.vsk = vsk,
|
|
};
|
|
|
|
/* Send RST only if the original pkt is not a RST pkt */
|
|
if (pkt && le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST)
|
|
return 0;
|
|
|
|
return virtio_transport_send_pkt_info(vsk, &info);
|
|
}
|
|
|
|
/* Normally packets are associated with a socket. There may be no socket if an
|
|
* attempt was made to connect to a socket that does not exist.
|
|
*/
|
|
static int virtio_transport_reset_no_sock(struct virtio_vsock_pkt *pkt)
|
|
{
|
|
const struct virtio_transport *t;
|
|
struct virtio_vsock_pkt *reply;
|
|
struct virtio_vsock_pkt_info info = {
|
|
.op = VIRTIO_VSOCK_OP_RST,
|
|
.type = le16_to_cpu(pkt->hdr.type),
|
|
.reply = true,
|
|
};
|
|
|
|
/* Send RST only if the original pkt is not a RST pkt */
|
|
if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST)
|
|
return 0;
|
|
|
|
reply = virtio_transport_alloc_pkt(&info, 0,
|
|
le64_to_cpu(pkt->hdr.dst_cid),
|
|
le32_to_cpu(pkt->hdr.dst_port),
|
|
le64_to_cpu(pkt->hdr.src_cid),
|
|
le32_to_cpu(pkt->hdr.src_port));
|
|
if (!reply)
|
|
return -ENOMEM;
|
|
|
|
t = virtio_transport_get_ops();
|
|
if (!t) {
|
|
virtio_transport_free_pkt(reply);
|
|
return -ENOTCONN;
|
|
}
|
|
|
|
return t->send_pkt(reply);
|
|
}
|
|
|
|
static void virtio_transport_wait_close(struct sock *sk, long timeout)
|
|
{
|
|
if (timeout) {
|
|
DEFINE_WAIT_FUNC(wait, woken_wake_function);
|
|
|
|
add_wait_queue(sk_sleep(sk), &wait);
|
|
|
|
do {
|
|
if (sk_wait_event(sk, &timeout,
|
|
sock_flag(sk, SOCK_DONE), &wait))
|
|
break;
|
|
} while (!signal_pending(current) && timeout);
|
|
|
|
remove_wait_queue(sk_sleep(sk), &wait);
|
|
}
|
|
}
|
|
|
|
static void virtio_transport_do_close(struct vsock_sock *vsk,
|
|
bool cancel_timeout)
|
|
{
|
|
struct sock *sk = sk_vsock(vsk);
|
|
|
|
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);
|
|
|
|
if (vsk->close_work_scheduled &&
|
|
(!cancel_timeout || cancel_delayed_work(&vsk->close_work))) {
|
|
vsk->close_work_scheduled = false;
|
|
|
|
vsock_remove_sock(vsk);
|
|
|
|
/* Release refcnt obtained when we scheduled the timeout */
|
|
sock_put(sk);
|
|
}
|
|
}
|
|
|
|
static void virtio_transport_close_timeout(struct work_struct *work)
|
|
{
|
|
struct vsock_sock *vsk =
|
|
container_of(work, struct vsock_sock, close_work.work);
|
|
struct sock *sk = sk_vsock(vsk);
|
|
|
|
sock_hold(sk);
|
|
lock_sock(sk);
|
|
|
|
if (!sock_flag(sk, SOCK_DONE)) {
|
|
(void)virtio_transport_reset(vsk, NULL);
|
|
|
|
virtio_transport_do_close(vsk, false);
|
|
}
|
|
|
|
vsk->close_work_scheduled = false;
|
|
|
|
release_sock(sk);
|
|
sock_put(sk);
|
|
}
|
|
|
|
/* User context, vsk->sk is locked */
|
|
static bool virtio_transport_close(struct vsock_sock *vsk)
|
|
{
|
|
struct sock *sk = &vsk->sk;
|
|
|
|
if (!(sk->sk_state == TCP_ESTABLISHED ||
|
|
sk->sk_state == TCP_CLOSING))
|
|
return true;
|
|
|
|
/* Already received SHUTDOWN from peer, reply with RST */
|
|
if ((vsk->peer_shutdown & SHUTDOWN_MASK) == SHUTDOWN_MASK) {
|
|
(void)virtio_transport_reset(vsk, NULL);
|
|
return true;
|
|
}
|
|
|
|
if ((sk->sk_shutdown & SHUTDOWN_MASK) != SHUTDOWN_MASK)
|
|
(void)virtio_transport_shutdown(vsk, SHUTDOWN_MASK);
|
|
|
|
if (sock_flag(sk, SOCK_LINGER) && !(current->flags & PF_EXITING))
|
|
virtio_transport_wait_close(sk, sk->sk_lingertime);
|
|
|
|
if (sock_flag(sk, SOCK_DONE)) {
|
|
return true;
|
|
}
|
|
|
|
sock_hold(sk);
|
|
INIT_DELAYED_WORK(&vsk->close_work,
|
|
virtio_transport_close_timeout);
|
|
vsk->close_work_scheduled = true;
|
|
schedule_delayed_work(&vsk->close_work, VSOCK_CLOSE_TIMEOUT);
|
|
return false;
|
|
}
|
|
|
|
void virtio_transport_release(struct vsock_sock *vsk)
|
|
{
|
|
struct virtio_vsock_sock *vvs = vsk->trans;
|
|
struct virtio_vsock_pkt *pkt, *tmp;
|
|
struct sock *sk = &vsk->sk;
|
|
bool remove_sock = true;
|
|
|
|
lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
|
|
if (sk->sk_type == SOCK_STREAM)
|
|
remove_sock = virtio_transport_close(vsk);
|
|
|
|
list_for_each_entry_safe(pkt, tmp, &vvs->rx_queue, list) {
|
|
list_del(&pkt->list);
|
|
virtio_transport_free_pkt(pkt);
|
|
}
|
|
release_sock(sk);
|
|
|
|
if (remove_sock)
|
|
vsock_remove_sock(vsk);
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_release);
|
|
|
|
static int
|
|
virtio_transport_recv_connecting(struct sock *sk,
|
|
struct virtio_vsock_pkt *pkt)
|
|
{
|
|
struct vsock_sock *vsk = vsock_sk(sk);
|
|
int err;
|
|
int skerr;
|
|
|
|
switch (le16_to_cpu(pkt->hdr.op)) {
|
|
case VIRTIO_VSOCK_OP_RESPONSE:
|
|
sk->sk_state = TCP_ESTABLISHED;
|
|
sk->sk_socket->state = SS_CONNECTED;
|
|
vsock_insert_connected(vsk);
|
|
sk->sk_state_change(sk);
|
|
break;
|
|
case VIRTIO_VSOCK_OP_INVALID:
|
|
break;
|
|
case VIRTIO_VSOCK_OP_RST:
|
|
skerr = ECONNRESET;
|
|
err = 0;
|
|
goto destroy;
|
|
default:
|
|
skerr = EPROTO;
|
|
err = -EINVAL;
|
|
goto destroy;
|
|
}
|
|
return 0;
|
|
|
|
destroy:
|
|
virtio_transport_reset(vsk, pkt);
|
|
sk->sk_state = TCP_CLOSE;
|
|
sk->sk_err = skerr;
|
|
sk->sk_error_report(sk);
|
|
return err;
|
|
}
|
|
|
|
static void
|
|
virtio_transport_recv_enqueue(struct vsock_sock *vsk,
|
|
struct virtio_vsock_pkt *pkt)
|
|
{
|
|
struct virtio_vsock_sock *vvs = vsk->trans;
|
|
bool can_enqueue, free_pkt = false;
|
|
|
|
pkt->len = le32_to_cpu(pkt->hdr.len);
|
|
pkt->off = 0;
|
|
|
|
spin_lock_bh(&vvs->rx_lock);
|
|
|
|
can_enqueue = virtio_transport_inc_rx_pkt(vvs, pkt);
|
|
if (!can_enqueue) {
|
|
free_pkt = true;
|
|
goto out;
|
|
}
|
|
|
|
/* Try to copy small packets into the buffer of last packet queued,
|
|
* to avoid wasting memory queueing the entire buffer with a small
|
|
* payload.
|
|
*/
|
|
if (pkt->len <= GOOD_COPY_LEN && !list_empty(&vvs->rx_queue)) {
|
|
struct virtio_vsock_pkt *last_pkt;
|
|
|
|
last_pkt = list_last_entry(&vvs->rx_queue,
|
|
struct virtio_vsock_pkt, list);
|
|
|
|
/* If there is space in the last packet queued, we copy the
|
|
* new packet in its buffer.
|
|
*/
|
|
if (pkt->len <= last_pkt->buf_len - last_pkt->len) {
|
|
memcpy(last_pkt->buf + last_pkt->len, pkt->buf,
|
|
pkt->len);
|
|
last_pkt->len += pkt->len;
|
|
free_pkt = true;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
list_add_tail(&pkt->list, &vvs->rx_queue);
|
|
|
|
out:
|
|
spin_unlock_bh(&vvs->rx_lock);
|
|
if (free_pkt)
|
|
virtio_transport_free_pkt(pkt);
|
|
}
|
|
|
|
static int
|
|
virtio_transport_recv_connected(struct sock *sk,
|
|
struct virtio_vsock_pkt *pkt)
|
|
{
|
|
struct vsock_sock *vsk = vsock_sk(sk);
|
|
int err = 0;
|
|
|
|
switch (le16_to_cpu(pkt->hdr.op)) {
|
|
case VIRTIO_VSOCK_OP_RW:
|
|
virtio_transport_recv_enqueue(vsk, pkt);
|
|
sk->sk_data_ready(sk);
|
|
return err;
|
|
case VIRTIO_VSOCK_OP_CREDIT_UPDATE:
|
|
sk->sk_write_space(sk);
|
|
break;
|
|
case VIRTIO_VSOCK_OP_SHUTDOWN:
|
|
if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SHUTDOWN_RCV)
|
|
vsk->peer_shutdown |= RCV_SHUTDOWN;
|
|
if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SHUTDOWN_SEND)
|
|
vsk->peer_shutdown |= SEND_SHUTDOWN;
|
|
if (vsk->peer_shutdown == SHUTDOWN_MASK &&
|
|
vsock_stream_has_data(vsk) <= 0) {
|
|
sock_set_flag(sk, SOCK_DONE);
|
|
sk->sk_state = TCP_CLOSING;
|
|
}
|
|
if (le32_to_cpu(pkt->hdr.flags))
|
|
sk->sk_state_change(sk);
|
|
break;
|
|
case VIRTIO_VSOCK_OP_RST:
|
|
virtio_transport_do_close(vsk, true);
|
|
break;
|
|
default:
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
virtio_transport_free_pkt(pkt);
|
|
return err;
|
|
}
|
|
|
|
static void
|
|
virtio_transport_recv_disconnecting(struct sock *sk,
|
|
struct virtio_vsock_pkt *pkt)
|
|
{
|
|
struct vsock_sock *vsk = vsock_sk(sk);
|
|
|
|
if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST)
|
|
virtio_transport_do_close(vsk, true);
|
|
}
|
|
|
|
static int
|
|
virtio_transport_send_response(struct vsock_sock *vsk,
|
|
struct virtio_vsock_pkt *pkt)
|
|
{
|
|
struct virtio_vsock_pkt_info info = {
|
|
.op = VIRTIO_VSOCK_OP_RESPONSE,
|
|
.type = VIRTIO_VSOCK_TYPE_STREAM,
|
|
.remote_cid = le64_to_cpu(pkt->hdr.src_cid),
|
|
.remote_port = le32_to_cpu(pkt->hdr.src_port),
|
|
.reply = true,
|
|
.vsk = vsk,
|
|
};
|
|
|
|
return virtio_transport_send_pkt_info(vsk, &info);
|
|
}
|
|
|
|
/* Handle server socket */
|
|
static int
|
|
virtio_transport_recv_listen(struct sock *sk, struct virtio_vsock_pkt *pkt)
|
|
{
|
|
struct vsock_sock *vsk = vsock_sk(sk);
|
|
struct vsock_sock *vchild;
|
|
struct sock *child;
|
|
|
|
if (le16_to_cpu(pkt->hdr.op) != VIRTIO_VSOCK_OP_REQUEST) {
|
|
virtio_transport_reset(vsk, pkt);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (sk_acceptq_is_full(sk)) {
|
|
virtio_transport_reset(vsk, pkt);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
child = __vsock_create(sock_net(sk), NULL, sk, GFP_KERNEL,
|
|
sk->sk_type, 0);
|
|
if (!child) {
|
|
virtio_transport_reset(vsk, pkt);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
sk->sk_ack_backlog++;
|
|
|
|
lock_sock_nested(child, SINGLE_DEPTH_NESTING);
|
|
|
|
child->sk_state = TCP_ESTABLISHED;
|
|
|
|
vchild = vsock_sk(child);
|
|
vsock_addr_init(&vchild->local_addr, le64_to_cpu(pkt->hdr.dst_cid),
|
|
le32_to_cpu(pkt->hdr.dst_port));
|
|
vsock_addr_init(&vchild->remote_addr, le64_to_cpu(pkt->hdr.src_cid),
|
|
le32_to_cpu(pkt->hdr.src_port));
|
|
|
|
vsock_insert_connected(vchild);
|
|
vsock_enqueue_accept(sk, child);
|
|
virtio_transport_send_response(vchild, pkt);
|
|
|
|
release_sock(child);
|
|
|
|
sk->sk_data_ready(sk);
|
|
return 0;
|
|
}
|
|
|
|
static bool virtio_transport_space_update(struct sock *sk,
|
|
struct virtio_vsock_pkt *pkt)
|
|
{
|
|
struct vsock_sock *vsk = vsock_sk(sk);
|
|
struct virtio_vsock_sock *vvs = vsk->trans;
|
|
bool space_available;
|
|
|
|
/* buf_alloc and fwd_cnt is always included in the hdr */
|
|
spin_lock_bh(&vvs->tx_lock);
|
|
vvs->peer_buf_alloc = le32_to_cpu(pkt->hdr.buf_alloc);
|
|
vvs->peer_fwd_cnt = le32_to_cpu(pkt->hdr.fwd_cnt);
|
|
space_available = virtio_transport_has_space(vsk);
|
|
spin_unlock_bh(&vvs->tx_lock);
|
|
return space_available;
|
|
}
|
|
|
|
/* We are under the virtio-vsock's vsock->rx_lock or vhost-vsock's vq->mutex
|
|
* lock.
|
|
*/
|
|
void virtio_transport_recv_pkt(struct virtio_vsock_pkt *pkt)
|
|
{
|
|
struct sockaddr_vm src, dst;
|
|
struct vsock_sock *vsk;
|
|
struct sock *sk;
|
|
bool space_available;
|
|
|
|
vsock_addr_init(&src, le64_to_cpu(pkt->hdr.src_cid),
|
|
le32_to_cpu(pkt->hdr.src_port));
|
|
vsock_addr_init(&dst, le64_to_cpu(pkt->hdr.dst_cid),
|
|
le32_to_cpu(pkt->hdr.dst_port));
|
|
|
|
trace_virtio_transport_recv_pkt(src.svm_cid, src.svm_port,
|
|
dst.svm_cid, dst.svm_port,
|
|
le32_to_cpu(pkt->hdr.len),
|
|
le16_to_cpu(pkt->hdr.type),
|
|
le16_to_cpu(pkt->hdr.op),
|
|
le32_to_cpu(pkt->hdr.flags),
|
|
le32_to_cpu(pkt->hdr.buf_alloc),
|
|
le32_to_cpu(pkt->hdr.fwd_cnt));
|
|
|
|
if (le16_to_cpu(pkt->hdr.type) != VIRTIO_VSOCK_TYPE_STREAM) {
|
|
(void)virtio_transport_reset_no_sock(pkt);
|
|
goto free_pkt;
|
|
}
|
|
|
|
/* The socket must be in connected or bound table
|
|
* otherwise send reset back
|
|
*/
|
|
sk = vsock_find_connected_socket(&src, &dst);
|
|
if (!sk) {
|
|
sk = vsock_find_bound_socket(&dst);
|
|
if (!sk) {
|
|
(void)virtio_transport_reset_no_sock(pkt);
|
|
goto free_pkt;
|
|
}
|
|
}
|
|
|
|
vsk = vsock_sk(sk);
|
|
|
|
space_available = virtio_transport_space_update(sk, pkt);
|
|
|
|
lock_sock(sk);
|
|
|
|
/* Update CID in case it has changed after a transport reset event */
|
|
vsk->local_addr.svm_cid = dst.svm_cid;
|
|
|
|
if (space_available)
|
|
sk->sk_write_space(sk);
|
|
|
|
switch (sk->sk_state) {
|
|
case TCP_LISTEN:
|
|
virtio_transport_recv_listen(sk, pkt);
|
|
virtio_transport_free_pkt(pkt);
|
|
break;
|
|
case TCP_SYN_SENT:
|
|
virtio_transport_recv_connecting(sk, pkt);
|
|
virtio_transport_free_pkt(pkt);
|
|
break;
|
|
case TCP_ESTABLISHED:
|
|
virtio_transport_recv_connected(sk, pkt);
|
|
break;
|
|
case TCP_CLOSING:
|
|
virtio_transport_recv_disconnecting(sk, pkt);
|
|
virtio_transport_free_pkt(pkt);
|
|
break;
|
|
default:
|
|
virtio_transport_free_pkt(pkt);
|
|
break;
|
|
}
|
|
release_sock(sk);
|
|
|
|
/* Release refcnt obtained when we fetched this socket out of the
|
|
* bound or connected list.
|
|
*/
|
|
sock_put(sk);
|
|
return;
|
|
|
|
free_pkt:
|
|
virtio_transport_free_pkt(pkt);
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_recv_pkt);
|
|
|
|
void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt)
|
|
{
|
|
kfree(pkt->buf);
|
|
kfree(pkt);
|
|
}
|
|
EXPORT_SYMBOL_GPL(virtio_transport_free_pkt);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR("Asias He");
|
|
MODULE_DESCRIPTION("common code for virtio vsock");
|