mirror of
https://git.FreeBSD.org/src.git
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8a114a66b5
Use strlcpy to guarantee NUL termination of the path to a virtio console socket. Reported by: Coverity CID: 1362874 Sponsored by: Dell EMC
674 lines
16 KiB
C
674 lines
16 KiB
C
/*-
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* Copyright (c) 2016 iXsystems Inc.
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* All rights reserved.
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*
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* This software was developed by Jakub Klama <jceel@FreeBSD.org>
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* under sponsorship from iXsystems Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#ifndef WITHOUT_CAPSICUM
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#include <sys/capsicum.h>
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#endif
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#include <sys/linker_set.h>
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#include <sys/uio.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <string.h>
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#include <unistd.h>
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#include <assert.h>
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#include <pthread.h>
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#include <libgen.h>
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#include <sysexits.h>
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#include "bhyverun.h"
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#include "pci_emul.h"
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#include "virtio.h"
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#include "mevent.h"
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#include "sockstream.h"
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#define VTCON_RINGSZ 64
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#define VTCON_MAXPORTS 16
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#define VTCON_MAXQ (VTCON_MAXPORTS * 2 + 2)
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#define VTCON_DEVICE_READY 0
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#define VTCON_DEVICE_ADD 1
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#define VTCON_DEVICE_REMOVE 2
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#define VTCON_PORT_READY 3
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#define VTCON_CONSOLE_PORT 4
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#define VTCON_CONSOLE_RESIZE 5
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#define VTCON_PORT_OPEN 6
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#define VTCON_PORT_NAME 7
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#define VTCON_F_SIZE 0
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#define VTCON_F_MULTIPORT 1
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#define VTCON_F_EMERG_WRITE 2
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#define VTCON_S_HOSTCAPS \
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(VTCON_F_SIZE | VTCON_F_MULTIPORT | VTCON_F_EMERG_WRITE)
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static int pci_vtcon_debug;
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#define DPRINTF(params) if (pci_vtcon_debug) printf params
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#define WPRINTF(params) printf params
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struct pci_vtcon_softc;
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struct pci_vtcon_port;
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struct pci_vtcon_config;
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typedef void (pci_vtcon_cb_t)(struct pci_vtcon_port *, void *, struct iovec *,
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int);
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struct pci_vtcon_port {
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struct pci_vtcon_softc * vsp_sc;
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int vsp_id;
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const char * vsp_name;
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bool vsp_enabled;
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bool vsp_console;
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bool vsp_rx_ready;
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bool vsp_open;
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int vsp_rxq;
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int vsp_txq;
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void * vsp_arg;
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pci_vtcon_cb_t * vsp_cb;
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};
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struct pci_vtcon_sock
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{
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struct pci_vtcon_port * vss_port;
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const char * vss_path;
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struct mevent * vss_server_evp;
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struct mevent * vss_conn_evp;
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int vss_server_fd;
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int vss_conn_fd;
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bool vss_open;
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};
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struct pci_vtcon_softc {
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struct virtio_softc vsc_vs;
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struct vqueue_info vsc_queues[VTCON_MAXQ];
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pthread_mutex_t vsc_mtx;
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uint64_t vsc_cfg;
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uint64_t vsc_features;
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char * vsc_rootdir;
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int vsc_kq;
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int vsc_nports;
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bool vsc_ready;
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struct pci_vtcon_port vsc_control_port;
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struct pci_vtcon_port vsc_ports[VTCON_MAXPORTS];
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struct pci_vtcon_config *vsc_config;
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};
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struct pci_vtcon_config {
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uint16_t cols;
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uint16_t rows;
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uint32_t max_nr_ports;
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uint32_t emerg_wr;
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} __attribute__((packed));
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struct pci_vtcon_control {
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uint32_t id;
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uint16_t event;
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uint16_t value;
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} __attribute__((packed));
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struct pci_vtcon_console_resize {
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uint16_t cols;
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uint16_t rows;
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} __attribute__((packed));
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static void pci_vtcon_reset(void *);
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static void pci_vtcon_notify_rx(void *, struct vqueue_info *);
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static void pci_vtcon_notify_tx(void *, struct vqueue_info *);
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static int pci_vtcon_cfgread(void *, int, int, uint32_t *);
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static int pci_vtcon_cfgwrite(void *, int, int, uint32_t);
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static void pci_vtcon_neg_features(void *, uint64_t);
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static void pci_vtcon_sock_accept(int, enum ev_type, void *);
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static void pci_vtcon_sock_rx(int, enum ev_type, void *);
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static void pci_vtcon_sock_tx(struct pci_vtcon_port *, void *, struct iovec *,
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int);
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static void pci_vtcon_control_send(struct pci_vtcon_softc *,
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struct pci_vtcon_control *, const void *, size_t);
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static void pci_vtcon_announce_port(struct pci_vtcon_port *);
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static void pci_vtcon_open_port(struct pci_vtcon_port *, bool);
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static struct virtio_consts vtcon_vi_consts = {
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"vtcon", /* our name */
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VTCON_MAXQ, /* we support VTCON_MAXQ virtqueues */
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sizeof(struct pci_vtcon_config), /* config reg size */
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pci_vtcon_reset, /* reset */
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NULL, /* device-wide qnotify */
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pci_vtcon_cfgread, /* read virtio config */
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pci_vtcon_cfgwrite, /* write virtio config */
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pci_vtcon_neg_features, /* apply negotiated features */
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VTCON_S_HOSTCAPS, /* our capabilities */
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};
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static void
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pci_vtcon_reset(void *vsc)
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{
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struct pci_vtcon_softc *sc;
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sc = vsc;
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DPRINTF(("vtcon: device reset requested!\n"));
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vi_reset_dev(&sc->vsc_vs);
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}
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static void
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pci_vtcon_neg_features(void *vsc, uint64_t negotiated_features)
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{
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struct pci_vtcon_softc *sc = vsc;
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sc->vsc_features = negotiated_features;
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}
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static int
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pci_vtcon_cfgread(void *vsc, int offset, int size, uint32_t *retval)
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{
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struct pci_vtcon_softc *sc = vsc;
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void *ptr;
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ptr = (uint8_t *)sc->vsc_config + offset;
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memcpy(retval, ptr, size);
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return (0);
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}
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static int
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pci_vtcon_cfgwrite(void *vsc, int offset, int size, uint32_t val)
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{
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return (0);
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}
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static inline struct pci_vtcon_port *
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pci_vtcon_vq_to_port(struct pci_vtcon_softc *sc, struct vqueue_info *vq)
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{
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uint16_t num = vq->vq_num;
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if (num == 0 || num == 1)
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return (&sc->vsc_ports[0]);
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if (num == 2 || num == 3)
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return (&sc->vsc_control_port);
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return (&sc->vsc_ports[(num / 2) - 1]);
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}
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static inline struct vqueue_info *
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pci_vtcon_port_to_vq(struct pci_vtcon_port *port, bool tx_queue)
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{
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int qnum;
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qnum = tx_queue ? port->vsp_txq : port->vsp_rxq;
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return (&port->vsp_sc->vsc_queues[qnum]);
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}
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static struct pci_vtcon_port *
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pci_vtcon_port_add(struct pci_vtcon_softc *sc, const char *name,
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pci_vtcon_cb_t *cb, void *arg)
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{
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struct pci_vtcon_port *port;
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if (sc->vsc_nports == VTCON_MAXPORTS) {
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errno = EBUSY;
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return (NULL);
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}
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port = &sc->vsc_ports[sc->vsc_nports++];
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port->vsp_id = sc->vsc_nports - 1;
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port->vsp_sc = sc;
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port->vsp_name = name;
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port->vsp_cb = cb;
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port->vsp_arg = arg;
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if (port->vsp_id == 0) {
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/* port0 */
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port->vsp_txq = 0;
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port->vsp_rxq = 1;
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} else {
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port->vsp_txq = sc->vsc_nports * 2;
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port->vsp_rxq = port->vsp_txq + 1;
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}
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port->vsp_enabled = true;
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return (port);
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}
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static int
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pci_vtcon_sock_add(struct pci_vtcon_softc *sc, const char *name,
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const char *path)
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{
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struct pci_vtcon_sock *sock;
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struct sockaddr_un sun;
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char *pathcopy;
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int s = -1, fd = -1, error = 0;
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#ifndef WITHOUT_CAPSICUM
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cap_rights_t rights;
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#endif
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sock = calloc(1, sizeof(struct pci_vtcon_sock));
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if (sock == NULL) {
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error = -1;
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goto out;
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}
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s = socket(AF_UNIX, SOCK_STREAM, 0);
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if (s < 0) {
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error = -1;
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goto out;
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}
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pathcopy = strdup(path);
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if (pathcopy == NULL) {
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error = -1;
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goto out;
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}
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fd = open(dirname(pathcopy), O_RDONLY | O_DIRECTORY);
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if (fd < 0) {
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free(pathcopy);
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error = -1;
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goto out;
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}
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sun.sun_family = AF_UNIX;
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sun.sun_len = sizeof(struct sockaddr_un);
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strcpy(pathcopy, path);
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strlcpy(sun.sun_path, basename(pathcopy), sizeof(sun.sun_path));
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free(pathcopy);
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if (bindat(fd, s, (struct sockaddr *)&sun, sun.sun_len) < 0) {
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error = -1;
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goto out;
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}
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if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
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error = -1;
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goto out;
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}
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if (listen(s, 1) < 0) {
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error = -1;
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goto out;
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}
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#ifndef WITHOUT_CAPSICUM
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cap_rights_init(&rights, CAP_ACCEPT, CAP_EVENT, CAP_READ, CAP_WRITE);
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if (cap_rights_limit(s, &rights) == -1 && errno != ENOSYS)
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errx(EX_OSERR, "Unable to apply rights for sandbox");
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#endif
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sock->vss_port = pci_vtcon_port_add(sc, name, pci_vtcon_sock_tx, sock);
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if (sock->vss_port == NULL) {
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error = -1;
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goto out;
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}
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sock->vss_open = false;
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sock->vss_conn_fd = -1;
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sock->vss_server_fd = s;
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sock->vss_server_evp = mevent_add(s, EVF_READ, pci_vtcon_sock_accept,
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sock);
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if (sock->vss_server_evp == NULL) {
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error = -1;
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goto out;
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}
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out:
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if (fd != -1)
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close(fd);
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if (error != 0 && s != -1)
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close(s);
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return (error);
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}
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static void
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pci_vtcon_sock_accept(int fd __unused, enum ev_type t __unused, void *arg)
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{
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struct pci_vtcon_sock *sock = (struct pci_vtcon_sock *)arg;
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int s;
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s = accept(sock->vss_server_fd, NULL, NULL);
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if (s < 0)
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return;
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if (sock->vss_open) {
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close(s);
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return;
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}
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sock->vss_open = true;
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sock->vss_conn_fd = s;
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sock->vss_conn_evp = mevent_add(s, EVF_READ, pci_vtcon_sock_rx, sock);
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pci_vtcon_open_port(sock->vss_port, true);
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}
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static void
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pci_vtcon_sock_rx(int fd __unused, enum ev_type t __unused, void *arg)
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{
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struct pci_vtcon_port *port;
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struct pci_vtcon_sock *sock = (struct pci_vtcon_sock *)arg;
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struct vqueue_info *vq;
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struct iovec iov;
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static char dummybuf[2048];
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int len, n;
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uint16_t idx;
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port = sock->vss_port;
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vq = pci_vtcon_port_to_vq(port, true);
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if (!sock->vss_open || !port->vsp_rx_ready) {
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len = read(sock->vss_conn_fd, dummybuf, sizeof(dummybuf));
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if (len == 0)
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goto close;
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return;
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}
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if (!vq_has_descs(vq)) {
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len = read(sock->vss_conn_fd, dummybuf, sizeof(dummybuf));
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vq_endchains(vq, 1);
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if (len == 0)
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goto close;
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return;
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}
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do {
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n = vq_getchain(vq, &idx, &iov, 1, NULL);
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len = readv(sock->vss_conn_fd, &iov, n);
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if (len == 0 || (len < 0 && errno == EWOULDBLOCK)) {
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vq_retchain(vq);
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vq_endchains(vq, 0);
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if (len == 0)
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goto close;
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return;
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}
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vq_relchain(vq, idx, len);
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} while (vq_has_descs(vq));
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vq_endchains(vq, 1);
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close:
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mevent_delete_close(sock->vss_conn_evp);
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sock->vss_conn_fd = -1;
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sock->vss_open = false;
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}
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static void
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pci_vtcon_sock_tx(struct pci_vtcon_port *port, void *arg, struct iovec *iov,
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int niov)
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{
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struct pci_vtcon_sock *sock;
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int i, ret;
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sock = (struct pci_vtcon_sock *)arg;
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if (sock->vss_conn_fd == -1)
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return;
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for (i = 0; i < niov; i++) {
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ret = stream_write(sock->vss_conn_fd, iov[i].iov_base,
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iov[i].iov_len);
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if (ret <= 0)
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break;
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}
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if (ret <= 0) {
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mevent_delete_close(sock->vss_conn_evp);
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sock->vss_conn_fd = -1;
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sock->vss_open = false;
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}
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}
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static void
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pci_vtcon_control_tx(struct pci_vtcon_port *port, void *arg, struct iovec *iov,
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int niov)
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{
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struct pci_vtcon_softc *sc;
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struct pci_vtcon_port *tmp;
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struct pci_vtcon_control resp, *ctrl;
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int i;
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assert(niov == 1);
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sc = port->vsp_sc;
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ctrl = (struct pci_vtcon_control *)iov->iov_base;
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switch (ctrl->event) {
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case VTCON_DEVICE_READY:
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sc->vsc_ready = true;
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/* set port ready events for registered ports */
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for (i = 0; i < VTCON_MAXPORTS; i++) {
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tmp = &sc->vsc_ports[i];
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if (tmp->vsp_enabled)
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pci_vtcon_announce_port(tmp);
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if (tmp->vsp_open)
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pci_vtcon_open_port(tmp, true);
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}
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break;
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case VTCON_PORT_READY:
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if (ctrl->id >= sc->vsc_nports) {
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WPRINTF(("VTCON_PORT_READY event for unknown port %d\n",
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ctrl->id));
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return;
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}
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tmp = &sc->vsc_ports[ctrl->id];
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if (tmp->vsp_console) {
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resp.event = VTCON_CONSOLE_PORT;
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resp.id = ctrl->id;
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resp.value = 1;
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pci_vtcon_control_send(sc, &resp, NULL, 0);
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}
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break;
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}
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}
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static void
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pci_vtcon_announce_port(struct pci_vtcon_port *port)
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{
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struct pci_vtcon_control event;
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event.id = port->vsp_id;
|
|
event.event = VTCON_DEVICE_ADD;
|
|
event.value = 1;
|
|
pci_vtcon_control_send(port->vsp_sc, &event, NULL, 0);
|
|
|
|
event.event = VTCON_PORT_NAME;
|
|
pci_vtcon_control_send(port->vsp_sc, &event, port->vsp_name,
|
|
strlen(port->vsp_name));
|
|
}
|
|
|
|
static void
|
|
pci_vtcon_open_port(struct pci_vtcon_port *port, bool open)
|
|
{
|
|
struct pci_vtcon_control event;
|
|
|
|
if (!port->vsp_sc->vsc_ready) {
|
|
port->vsp_open = true;
|
|
return;
|
|
}
|
|
|
|
event.id = port->vsp_id;
|
|
event.event = VTCON_PORT_OPEN;
|
|
event.value = (int)open;
|
|
pci_vtcon_control_send(port->vsp_sc, &event, NULL, 0);
|
|
}
|
|
|
|
static void
|
|
pci_vtcon_control_send(struct pci_vtcon_softc *sc,
|
|
struct pci_vtcon_control *ctrl, const void *payload, size_t len)
|
|
{
|
|
struct vqueue_info *vq;
|
|
struct iovec iov;
|
|
uint16_t idx;
|
|
int n;
|
|
|
|
vq = pci_vtcon_port_to_vq(&sc->vsc_control_port, true);
|
|
|
|
if (!vq_has_descs(vq))
|
|
return;
|
|
|
|
n = vq_getchain(vq, &idx, &iov, 1, NULL);
|
|
|
|
assert(n == 1);
|
|
|
|
memcpy(iov.iov_base, ctrl, sizeof(struct pci_vtcon_control));
|
|
if (payload != NULL && len > 0)
|
|
memcpy(iov.iov_base + sizeof(struct pci_vtcon_control),
|
|
payload, len);
|
|
|
|
vq_relchain(vq, idx, sizeof(struct pci_vtcon_control) + len);
|
|
vq_endchains(vq, 1);
|
|
}
|
|
|
|
|
|
static void
|
|
pci_vtcon_notify_tx(void *vsc, struct vqueue_info *vq)
|
|
{
|
|
struct pci_vtcon_softc *sc;
|
|
struct pci_vtcon_port *port;
|
|
struct iovec iov[1];
|
|
uint16_t idx, n;
|
|
uint16_t flags[8];
|
|
|
|
sc = vsc;
|
|
port = pci_vtcon_vq_to_port(sc, vq);
|
|
|
|
while (vq_has_descs(vq)) {
|
|
n = vq_getchain(vq, &idx, iov, 1, flags);
|
|
assert(n >= 1);
|
|
if (port != NULL)
|
|
port->vsp_cb(port, port->vsp_arg, iov, 1);
|
|
|
|
/*
|
|
* Release this chain and handle more
|
|
*/
|
|
vq_relchain(vq, idx, 0);
|
|
}
|
|
vq_endchains(vq, 1); /* Generate interrupt if appropriate. */
|
|
}
|
|
|
|
static void
|
|
pci_vtcon_notify_rx(void *vsc, struct vqueue_info *vq)
|
|
{
|
|
struct pci_vtcon_softc *sc;
|
|
struct pci_vtcon_port *port;
|
|
|
|
sc = vsc;
|
|
port = pci_vtcon_vq_to_port(sc, vq);
|
|
|
|
if (!port->vsp_rx_ready) {
|
|
port->vsp_rx_ready = 1;
|
|
vq->vq_used->vu_flags |= VRING_USED_F_NO_NOTIFY;
|
|
}
|
|
}
|
|
|
|
static int
|
|
pci_vtcon_init(struct vmctx *ctx, struct pci_devinst *pi, char *opts)
|
|
{
|
|
struct pci_vtcon_softc *sc;
|
|
char *portname = NULL;
|
|
char *portpath = NULL;
|
|
char *opt;
|
|
int i;
|
|
|
|
sc = calloc(1, sizeof(struct pci_vtcon_softc));
|
|
sc->vsc_config = calloc(1, sizeof(struct pci_vtcon_config));
|
|
sc->vsc_config->max_nr_ports = VTCON_MAXPORTS;
|
|
sc->vsc_config->cols = 80;
|
|
sc->vsc_config->rows = 25;
|
|
|
|
vi_softc_linkup(&sc->vsc_vs, &vtcon_vi_consts, sc, pi, sc->vsc_queues);
|
|
sc->vsc_vs.vs_mtx = &sc->vsc_mtx;
|
|
|
|
for (i = 0; i < VTCON_MAXQ; i++) {
|
|
sc->vsc_queues[i].vq_qsize = VTCON_RINGSZ;
|
|
sc->vsc_queues[i].vq_notify = i % 2 == 0
|
|
? pci_vtcon_notify_rx
|
|
: pci_vtcon_notify_tx;
|
|
}
|
|
|
|
/* initialize config space */
|
|
pci_set_cfgdata16(pi, PCIR_DEVICE, VIRTIO_DEV_CONSOLE);
|
|
pci_set_cfgdata16(pi, PCIR_VENDOR, VIRTIO_VENDOR);
|
|
pci_set_cfgdata8(pi, PCIR_CLASS, PCIC_SIMPLECOMM);
|
|
pci_set_cfgdata16(pi, PCIR_SUBDEV_0, VIRTIO_TYPE_CONSOLE);
|
|
pci_set_cfgdata16(pi, PCIR_SUBVEND_0, VIRTIO_VENDOR);
|
|
|
|
if (vi_intr_init(&sc->vsc_vs, 1, fbsdrun_virtio_msix()))
|
|
return (1);
|
|
vi_set_io_bar(&sc->vsc_vs, 0);
|
|
|
|
/* create control port */
|
|
sc->vsc_control_port.vsp_sc = sc;
|
|
sc->vsc_control_port.vsp_txq = 2;
|
|
sc->vsc_control_port.vsp_rxq = 3;
|
|
sc->vsc_control_port.vsp_cb = pci_vtcon_control_tx;
|
|
sc->vsc_control_port.vsp_enabled = true;
|
|
|
|
while ((opt = strsep(&opts, ",")) != NULL) {
|
|
portname = strsep(&opt, "=");
|
|
portpath = opt;
|
|
|
|
/* create port */
|
|
if (pci_vtcon_sock_add(sc, portname, portpath) < 0) {
|
|
fprintf(stderr, "cannot create port %s: %s\n",
|
|
portname, strerror(errno));
|
|
return (1);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
struct pci_devemu pci_de_vcon = {
|
|
.pe_emu = "virtio-console",
|
|
.pe_init = pci_vtcon_init,
|
|
.pe_barwrite = vi_pci_write,
|
|
.pe_barread = vi_pci_read
|
|
};
|
|
PCI_EMUL_SET(pci_de_vcon);
|