--- /dev/null
+/*
+ * Vhost User Bridge
+ *
+ * Copyright (c) 2015 Red Hat, Inc.
+ *
+ * Authors:
+ * Victor Kaplansky <victork@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * later. See the COPYING file in the top-level directory.
+ */
+
+/*
+ * TODO:
+ * - main should get parameters from the command line.
+ * - implement all request handlers. Still not implemented:
+ * vubr_get_queue_num_exec()
+ * vubr_send_rarp_exec()
+ * - test for broken requests and virtqueue.
+ * - implement features defined by Virtio 1.0 spec.
+ * - support mergeable buffers and indirect descriptors.
+ * - implement clean shutdown.
+ * - implement non-blocking writes to UDP backend.
+ * - implement polling strategy.
+ * - implement clean starting/stopping of vq processing
+ * - implement clean starting/stopping of used and buffers
+ * dirty page logging.
+ */
+
+#define _FILE_OFFSET_BITS 64
+
+#include "qemu/osdep.h"
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/unistd.h>
+#include <sys/mman.h>
+#include <sys/eventfd.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <qemu/osdep.h>
+
+#include <linux/vhost.h>
+
+#include "qemu/atomic.h"
+#include "standard-headers/linux/virtio_net.h"
+#include "standard-headers/linux/virtio_ring.h"
+
+#define VHOST_USER_BRIDGE_DEBUG 1
+
+#define DPRINT(...) \
+ do { \
+ if (VHOST_USER_BRIDGE_DEBUG) { \
+ printf(__VA_ARGS__); \
+ } \
+ } while (0)
+
+typedef void (*CallbackFunc)(int sock, void *ctx);
+
+typedef struct Event {
+ void *ctx;
+ CallbackFunc callback;
+} Event;
+
+typedef struct Dispatcher {
+ int max_sock;
+ fd_set fdset;
+ Event events[FD_SETSIZE];
+} Dispatcher;
+
+static void
+vubr_die(const char *s)
+{
+ perror(s);
+ exit(1);
+}
+
+static int
+dispatcher_init(Dispatcher *dispr)
+{
+ FD_ZERO(&dispr->fdset);
+ dispr->max_sock = -1;
+ return 0;
+}
+
+static int
+dispatcher_add(Dispatcher *dispr, int sock, void *ctx, CallbackFunc cb)
+{
+ if (sock >= FD_SETSIZE) {
+ fprintf(stderr,
+ "Error: Failed to add new event. sock %d should be less than %d\n",
+ sock, FD_SETSIZE);
+ return -1;
+ }
+
+ dispr->events[sock].ctx = ctx;
+ dispr->events[sock].callback = cb;
+
+ FD_SET(sock, &dispr->fdset);
+ if (sock > dispr->max_sock) {
+ dispr->max_sock = sock;
+ }
+ DPRINT("Added sock %d for watching. max_sock: %d\n",
+ sock, dispr->max_sock);
+ return 0;
+}
+
+/* dispatcher_remove() is not currently in use but may be useful
+ * in the future. */
+static int
+dispatcher_remove(Dispatcher *dispr, int sock)
+{
+ if (sock >= FD_SETSIZE) {
+ fprintf(stderr,
+ "Error: Failed to remove event. sock %d should be less than %d\n",
+ sock, FD_SETSIZE);
+ return -1;
+ }
+
+ FD_CLR(sock, &dispr->fdset);
+ DPRINT("Sock %d removed from dispatcher watch.\n", sock);
+ return 0;
+}
+
+/* timeout in us */
+static int
+dispatcher_wait(Dispatcher *dispr, uint32_t timeout)
+{
+ struct timeval tv;
+ tv.tv_sec = timeout / 1000000;
+ tv.tv_usec = timeout % 1000000;
+
+ fd_set fdset = dispr->fdset;
+
+ /* wait until some of sockets become readable. */
+ int rc = select(dispr->max_sock + 1, &fdset, 0, 0, &tv);
+
+ if (rc == -1) {
+ vubr_die("select");
+ }
+
+ /* Timeout */
+ if (rc == 0) {
+ return 0;
+ }
+
+ /* Now call callback for every ready socket. */
+
+ int sock;
+ for (sock = 0; sock < dispr->max_sock + 1; sock++) {
+ /* The callback on a socket can remove other sockets from the
+ * dispatcher, thus we have to check that the socket is
+ * still not removed from dispatcher's list
+ */
+ if (FD_ISSET(sock, &fdset) && FD_ISSET(sock, &dispr->fdset)) {
+ Event *e = &dispr->events[sock];
+ e->callback(sock, e->ctx);
+ }
+ }
+
+ return 0;
+}
+
+typedef struct VubrVirtq {
+ int call_fd;
+ int kick_fd;
+ uint32_t size;
+ uint16_t last_avail_index;
+ uint16_t last_used_index;
+ struct vring_desc *desc;
+ struct vring_avail *avail;
+ struct vring_used *used;
+ uint64_t log_guest_addr;
+ int enable;
+} VubrVirtq;
+
+/* Based on qemu/hw/virtio/vhost-user.c */
+
+#define VHOST_MEMORY_MAX_NREGIONS 8
+#define VHOST_USER_F_PROTOCOL_FEATURES 30
+/* v1.0 compliant. */
+#define VIRTIO_F_VERSION_1 32
+
+#define VHOST_LOG_PAGE 4096
+
+enum VhostUserProtocolFeature {
+ VHOST_USER_PROTOCOL_F_MQ = 0,
+ VHOST_USER_PROTOCOL_F_LOG_SHMFD = 1,
+ VHOST_USER_PROTOCOL_F_RARP = 2,
+
+ VHOST_USER_PROTOCOL_F_MAX
+};
+
+#define VHOST_USER_PROTOCOL_FEATURE_MASK ((1 << VHOST_USER_PROTOCOL_F_MAX) - 1)
+
+typedef enum VhostUserRequest {
+ VHOST_USER_NONE = 0,
+ VHOST_USER_GET_FEATURES = 1,
+ VHOST_USER_SET_FEATURES = 2,
+ VHOST_USER_SET_OWNER = 3,
+ VHOST_USER_RESET_OWNER = 4,
+ VHOST_USER_SET_MEM_TABLE = 5,
+ VHOST_USER_SET_LOG_BASE = 6,
+ VHOST_USER_SET_LOG_FD = 7,
+ VHOST_USER_SET_VRING_NUM = 8,
+ VHOST_USER_SET_VRING_ADDR = 9,
+ VHOST_USER_SET_VRING_BASE = 10,
+ VHOST_USER_GET_VRING_BASE = 11,
+ VHOST_USER_SET_VRING_KICK = 12,
+ VHOST_USER_SET_VRING_CALL = 13,
+ VHOST_USER_SET_VRING_ERR = 14,
+ VHOST_USER_GET_PROTOCOL_FEATURES = 15,
+ VHOST_USER_SET_PROTOCOL_FEATURES = 16,
+ VHOST_USER_GET_QUEUE_NUM = 17,
+ VHOST_USER_SET_VRING_ENABLE = 18,
+ VHOST_USER_SEND_RARP = 19,
+ VHOST_USER_MAX
+} VhostUserRequest;
+
+typedef struct VhostUserMemoryRegion {
+ uint64_t guest_phys_addr;
+ uint64_t memory_size;
+ uint64_t userspace_addr;
+ uint64_t mmap_offset;
+} VhostUserMemoryRegion;
+
+typedef struct VhostUserMemory {
+ uint32_t nregions;
+ uint32_t padding;
+ VhostUserMemoryRegion regions[VHOST_MEMORY_MAX_NREGIONS];
+} VhostUserMemory;
+
+typedef struct VhostUserLog {
+ uint64_t mmap_size;
+ uint64_t mmap_offset;
+} VhostUserLog;
+
+typedef struct VhostUserMsg {
+ VhostUserRequest request;
+
+#define VHOST_USER_VERSION_MASK (0x3)
+#define VHOST_USER_REPLY_MASK (0x1<<2)
+ uint32_t flags;
+ uint32_t size; /* the following payload size */
+ union {
+#define VHOST_USER_VRING_IDX_MASK (0xff)
+#define VHOST_USER_VRING_NOFD_MASK (0x1<<8)
+ uint64_t u64;
+ struct vhost_vring_state state;
+ struct vhost_vring_addr addr;
+ VhostUserMemory memory;
+ VhostUserLog log;
+ } payload;
+ int fds[VHOST_MEMORY_MAX_NREGIONS];
+ int fd_num;
+} QEMU_PACKED VhostUserMsg;
+
+#define VHOST_USER_HDR_SIZE offsetof(VhostUserMsg, payload.u64)
+
+/* The version of the protocol we support */
+#define VHOST_USER_VERSION (0x1)
+
+#define MAX_NR_VIRTQUEUE (8)
+
+typedef struct VubrDevRegion {
+ /* Guest Physical address. */
+ uint64_t gpa;
+ /* Memory region size. */
+ uint64_t size;
+ /* QEMU virtual address (userspace). */
+ uint64_t qva;
+ /* Starting offset in our mmaped space. */
+ uint64_t mmap_offset;
+ /* Start address of mmaped space. */
+ uint64_t mmap_addr;
+} VubrDevRegion;
+
+typedef struct VubrDev {
+ int sock;
+ Dispatcher dispatcher;
+ uint32_t nregions;
+ VubrDevRegion regions[VHOST_MEMORY_MAX_NREGIONS];
+ VubrVirtq vq[MAX_NR_VIRTQUEUE];
+ int log_call_fd;
+ uint64_t log_size;
+ uint8_t *log_table;
+ int backend_udp_sock;
+ struct sockaddr_in backend_udp_dest;
+ int ready;
+ uint64_t features;
+ int hdrlen;
+} VubrDev;
+
+static const char *vubr_request_str[] = {
+ [VHOST_USER_NONE] = "VHOST_USER_NONE",
+ [VHOST_USER_GET_FEATURES] = "VHOST_USER_GET_FEATURES",
+ [VHOST_USER_SET_FEATURES] = "VHOST_USER_SET_FEATURES",
+ [VHOST_USER_SET_OWNER] = "VHOST_USER_SET_OWNER",
+ [VHOST_USER_RESET_OWNER] = "VHOST_USER_RESET_OWNER",
+ [VHOST_USER_SET_MEM_TABLE] = "VHOST_USER_SET_MEM_TABLE",
+ [VHOST_USER_SET_LOG_BASE] = "VHOST_USER_SET_LOG_BASE",
+ [VHOST_USER_SET_LOG_FD] = "VHOST_USER_SET_LOG_FD",
+ [VHOST_USER_SET_VRING_NUM] = "VHOST_USER_SET_VRING_NUM",
+ [VHOST_USER_SET_VRING_ADDR] = "VHOST_USER_SET_VRING_ADDR",
+ [VHOST_USER_SET_VRING_BASE] = "VHOST_USER_SET_VRING_BASE",
+ [VHOST_USER_GET_VRING_BASE] = "VHOST_USER_GET_VRING_BASE",
+ [VHOST_USER_SET_VRING_KICK] = "VHOST_USER_SET_VRING_KICK",
+ [VHOST_USER_SET_VRING_CALL] = "VHOST_USER_SET_VRING_CALL",
+ [VHOST_USER_SET_VRING_ERR] = "VHOST_USER_SET_VRING_ERR",
+ [VHOST_USER_GET_PROTOCOL_FEATURES] = "VHOST_USER_GET_PROTOCOL_FEATURES",
+ [VHOST_USER_SET_PROTOCOL_FEATURES] = "VHOST_USER_SET_PROTOCOL_FEATURES",
+ [VHOST_USER_GET_QUEUE_NUM] = "VHOST_USER_GET_QUEUE_NUM",
+ [VHOST_USER_SET_VRING_ENABLE] = "VHOST_USER_SET_VRING_ENABLE",
+ [VHOST_USER_SEND_RARP] = "VHOST_USER_SEND_RARP",
+ [VHOST_USER_MAX] = "VHOST_USER_MAX",
+};
+
+static void
+print_buffer(uint8_t *buf, size_t len)
+{
+ int i;
+ printf("Raw buffer:\n");
+ for (i = 0; i < len; i++) {
+ if (i % 16 == 0) {
+ printf("\n");
+ }
+ if (i % 4 == 0) {
+ printf(" ");
+ }
+ printf("%02x ", buf[i]);
+ }
+ printf("\n............................................................\n");
+}
+
+/* Translate guest physical address to our virtual address. */
+static uint64_t
+gpa_to_va(VubrDev *dev, uint64_t guest_addr)
+{
+ int i;
+
+ /* Find matching memory region. */
+ for (i = 0; i < dev->nregions; i++) {
+ VubrDevRegion *r = &dev->regions[i];
+
+ if ((guest_addr >= r->gpa) && (guest_addr < (r->gpa + r->size))) {
+ return guest_addr - r->gpa + r->mmap_addr + r->mmap_offset;
+ }
+ }
+
+ assert(!"address not found in regions");
+ return 0;
+}
+
+/* Translate qemu virtual address to our virtual address. */
+static uint64_t
+qva_to_va(VubrDev *dev, uint64_t qemu_addr)
+{
+ int i;
+
+ /* Find matching memory region. */
+ for (i = 0; i < dev->nregions; i++) {
+ VubrDevRegion *r = &dev->regions[i];
+
+ if ((qemu_addr >= r->qva) && (qemu_addr < (r->qva + r->size))) {
+ return qemu_addr - r->qva + r->mmap_addr + r->mmap_offset;
+ }
+ }
+
+ assert(!"address not found in regions");
+ return 0;
+}
+
+static void
+vubr_message_read(int conn_fd, VhostUserMsg *vmsg)
+{
+ char control[CMSG_SPACE(VHOST_MEMORY_MAX_NREGIONS * sizeof(int))] = { };
+ struct iovec iov = {
+ .iov_base = (char *)vmsg,
+ .iov_len = VHOST_USER_HDR_SIZE,
+ };
+ struct msghdr msg = {
+ .msg_iov = &iov,
+ .msg_iovlen = 1,
+ .msg_control = control,
+ .msg_controllen = sizeof(control),
+ };
+ size_t fd_size;
+ struct cmsghdr *cmsg;
+ int rc;
+
+ rc = recvmsg(conn_fd, &msg, 0);
+
+ if (rc == 0) {
+ vubr_die("recvmsg");
+ fprintf(stderr, "Peer disconnected.\n");
+ exit(1);
+ }
+ if (rc < 0) {
+ vubr_die("recvmsg");
+ }
+
+ vmsg->fd_num = 0;
+ for (cmsg = CMSG_FIRSTHDR(&msg);
+ cmsg != NULL;
+ cmsg = CMSG_NXTHDR(&msg, cmsg))
+ {
+ if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) {
+ fd_size = cmsg->cmsg_len - CMSG_LEN(0);
+ vmsg->fd_num = fd_size / sizeof(int);
+ memcpy(vmsg->fds, CMSG_DATA(cmsg), fd_size);
+ break;
+ }
+ }
+
+ if (vmsg->size > sizeof(vmsg->payload)) {
+ fprintf(stderr,
+ "Error: too big message request: %d, size: vmsg->size: %u, "
+ "while sizeof(vmsg->payload) = %zu\n",
+ vmsg->request, vmsg->size, sizeof(vmsg->payload));
+ exit(1);
+ }
+
+ if (vmsg->size) {
+ rc = read(conn_fd, &vmsg->payload, vmsg->size);
+ if (rc == 0) {
+ vubr_die("recvmsg");
+ fprintf(stderr, "Peer disconnected.\n");
+ exit(1);
+ }
+ if (rc < 0) {
+ vubr_die("recvmsg");
+ }
+
+ assert(rc == vmsg->size);
+ }
+}
+
+static void
+vubr_message_write(int conn_fd, VhostUserMsg *vmsg)
+{
+ int rc;
+
+ do {
+ rc = write(conn_fd, vmsg, VHOST_USER_HDR_SIZE + vmsg->size);
+ } while (rc < 0 && errno == EINTR);
+
+ if (rc < 0) {
+ vubr_die("write");
+ }
+}
+
+static void
+vubr_backend_udp_sendbuf(VubrDev *dev, uint8_t *buf, size_t len)
+{
+ int slen = sizeof(struct sockaddr_in);
+
+ if (sendto(dev->backend_udp_sock, buf, len, 0,
+ (struct sockaddr *) &dev->backend_udp_dest, slen) == -1) {
+ vubr_die("sendto()");
+ }
+}
+
+static int
+vubr_backend_udp_recvbuf(VubrDev *dev, uint8_t *buf, size_t buflen)
+{
+ int slen = sizeof(struct sockaddr_in);
+ int rc;
+
+ rc = recvfrom(dev->backend_udp_sock, buf, buflen, 0,
+ (struct sockaddr *) &dev->backend_udp_dest,
+ (socklen_t *)&slen);
+ if (rc == -1) {
+ vubr_die("recvfrom()");
+ }
+
+ return rc;
+}
+
+static void
+vubr_consume_raw_packet(VubrDev *dev, uint8_t *buf, uint32_t len)
+{
+ int hdrlen = dev->hdrlen;
+ DPRINT(" hdrlen = %d\n", dev->hdrlen);
+
+ if (VHOST_USER_BRIDGE_DEBUG) {
+ print_buffer(buf, len);
+ }
+ vubr_backend_udp_sendbuf(dev, buf + hdrlen, len - hdrlen);
+}
+
+/* Kick the log_call_fd if required. */
+static void
+vubr_log_kick(VubrDev *dev)
+{
+ if (dev->log_call_fd != -1) {
+ DPRINT("Kicking the QEMU's log...\n");
+ eventfd_write(dev->log_call_fd, 1);
+ }
+}
+
+/* Kick the guest if necessary. */
+static void
+vubr_virtqueue_kick(VubrVirtq *vq)
+{
+ if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)) {
+ DPRINT("Kicking the guest...\n");
+ eventfd_write(vq->call_fd, 1);
+ }
+}
+
+static void
+vubr_log_page(uint8_t *log_table, uint64_t page)
+{
+ DPRINT("Logged dirty guest page: %"PRId64"\n", page);
+ atomic_or(&log_table[page / 8], 1 << (page % 8));
+}
+
+static void
+vubr_log_write(VubrDev *dev, uint64_t address, uint64_t length)
+{
+ uint64_t page;
+
+ if (!(dev->features & (1ULL << VHOST_F_LOG_ALL)) ||
+ !dev->log_table || !length) {
+ return;
+ }
+
+ assert(dev->log_size > ((address + length - 1) / VHOST_LOG_PAGE / 8));
+
+ page = address / VHOST_LOG_PAGE;
+ while (page * VHOST_LOG_PAGE < address + length) {
+ vubr_log_page(dev->log_table, page);
+ page += VHOST_LOG_PAGE;
+ }
+ vubr_log_kick(dev);
+}
+
+static void
+vubr_post_buffer(VubrDev *dev, VubrVirtq *vq, uint8_t *buf, int32_t len)
+{
+ struct vring_desc *desc = vq->desc;
+ struct vring_avail *avail = vq->avail;
+ struct vring_used *used = vq->used;
+ uint64_t log_guest_addr = vq->log_guest_addr;
+ int32_t remaining_len = len;
+
+ unsigned int size = vq->size;
+
+ uint16_t avail_index = atomic_mb_read(&avail->idx);
+
+ /* We check the available descriptors before posting the
+ * buffer, so here we assume that enough available
+ * descriptors. */
+ assert(vq->last_avail_index != avail_index);
+ uint16_t a_index = vq->last_avail_index % size;
+ uint16_t u_index = vq->last_used_index % size;
+ uint16_t d_index = avail->ring[a_index];
+
+ int i = d_index;
+ uint32_t written_len = 0;
+
+ do {
+ DPRINT("Post packet to guest on vq:\n");
+ DPRINT(" size = %d\n", vq->size);
+ DPRINT(" last_avail_index = %d\n", vq->last_avail_index);
+ DPRINT(" last_used_index = %d\n", vq->last_used_index);
+ DPRINT(" a_index = %d\n", a_index);
+ DPRINT(" u_index = %d\n", u_index);
+ DPRINT(" d_index = %d\n", d_index);
+ DPRINT(" desc[%d].addr = 0x%016"PRIx64"\n", i, desc[i].addr);
+ DPRINT(" desc[%d].len = %d\n", i, desc[i].len);
+ DPRINT(" desc[%d].flags = %d\n", i, desc[i].flags);
+ DPRINT(" avail->idx = %d\n", avail_index);
+ DPRINT(" used->idx = %d\n", used->idx);
+
+ if (!(desc[i].flags & VRING_DESC_F_WRITE)) {
+ /* FIXME: we should find writable descriptor. */
+ fprintf(stderr, "Error: descriptor is not writable. Exiting.\n");
+ exit(1);
+ }
+
+ void *chunk_start = (void *)(uintptr_t)gpa_to_va(dev, desc[i].addr);
+ uint32_t chunk_len = desc[i].len;
+ uint32_t chunk_write_len = MIN(remaining_len, chunk_len);
+
+ memcpy(chunk_start, buf + written_len, chunk_write_len);
+ vubr_log_write(dev, desc[i].addr, chunk_write_len);
+ remaining_len -= chunk_write_len;
+ written_len += chunk_write_len;
+
+ if ((remaining_len == 0) || !(desc[i].flags & VRING_DESC_F_NEXT)) {
+ break;
+ }
+
+ i = desc[i].next;
+ } while (1);
+
+ if (remaining_len > 0) {
+ fprintf(stderr,
+ "Too long packet for RX, remaining_len = %d, Dropping...\n",
+ remaining_len);
+ return;
+ }
+
+ /* Add descriptor to the used ring. */
+ used->ring[u_index].id = d_index;
+ used->ring[u_index].len = len;
+ vubr_log_write(dev,
+ log_guest_addr + offsetof(struct vring_used, ring[u_index]),
+ sizeof(used->ring[u_index]));
+
+ vq->last_avail_index++;
+ vq->last_used_index++;
+
+ atomic_mb_set(&used->idx, vq->last_used_index);
+ vubr_log_write(dev,
+ log_guest_addr + offsetof(struct vring_used, idx),
+ sizeof(used->idx));
+
+ /* Kick the guest if necessary. */
+ vubr_virtqueue_kick(vq);
+}
+
+static int
+vubr_process_desc(VubrDev *dev, VubrVirtq *vq)
+{
+ struct vring_desc *desc = vq->desc;
+ struct vring_avail *avail = vq->avail;
+ struct vring_used *used = vq->used;
+ uint64_t log_guest_addr = vq->log_guest_addr;
+
+ unsigned int size = vq->size;
+
+ uint16_t a_index = vq->last_avail_index % size;
+ uint16_t u_index = vq->last_used_index % size;
+ uint16_t d_index = avail->ring[a_index];
+
+ uint32_t i, len = 0;
+ size_t buf_size = 4096;
+ uint8_t buf[4096];
+
+ DPRINT("Chunks: ");
+ i = d_index;
+ do {
+ void *chunk_start = (void *)(uintptr_t)gpa_to_va(dev, desc[i].addr);
+ uint32_t chunk_len = desc[i].len;
+
+ assert(!(desc[i].flags & VRING_DESC_F_WRITE));
+
+ if (len + chunk_len < buf_size) {
+ memcpy(buf + len, chunk_start, chunk_len);
+ DPRINT("%d ", chunk_len);
+ } else {
+ fprintf(stderr, "Error: too long packet. Dropping...\n");
+ break;
+ }
+
+ len += chunk_len;
+
+ if (!(desc[i].flags & VRING_DESC_F_NEXT)) {
+ break;
+ }
+
+ i = desc[i].next;
+ } while (1);
+ DPRINT("\n");
+
+ if (!len) {
+ return -1;
+ }
+
+ /* Add descriptor to the used ring. */
+ used->ring[u_index].id = d_index;
+ used->ring[u_index].len = len;
+ vubr_log_write(dev,
+ log_guest_addr + offsetof(struct vring_used, ring[u_index]),
+ sizeof(used->ring[u_index]));
+
+ vubr_consume_raw_packet(dev, buf, len);
+
+ return 0;
+}
+
+static void
+vubr_process_avail(VubrDev *dev, VubrVirtq *vq)
+{
+ struct vring_avail *avail = vq->avail;
+ struct vring_used *used = vq->used;
+ uint64_t log_guest_addr = vq->log_guest_addr;
+
+ while (vq->last_avail_index != atomic_mb_read(&avail->idx)) {
+ vubr_process_desc(dev, vq);
+ vq->last_avail_index++;
+ vq->last_used_index++;
+ }
+
+ atomic_mb_set(&used->idx, vq->last_used_index);
+ vubr_log_write(dev,
+ log_guest_addr + offsetof(struct vring_used, idx),
+ sizeof(used->idx));
+}
+
+static void
+vubr_backend_recv_cb(int sock, void *ctx)
+{
+ VubrDev *dev = (VubrDev *) ctx;
+ VubrVirtq *rx_vq = &dev->vq[0];
+ uint8_t buf[4096];
+ struct virtio_net_hdr_v1 *hdr = (struct virtio_net_hdr_v1 *)buf;
+ int hdrlen = dev->hdrlen;
+ int buflen = sizeof(buf);
+ int len;
+
+ if (!dev->ready) {
+ return;
+ }
+
+ DPRINT("\n\n *** IN UDP RECEIVE CALLBACK ***\n\n");
+ DPRINT(" hdrlen = %d\n", hdrlen);
+
+ uint16_t avail_index = atomic_mb_read(&rx_vq->avail->idx);
+
+ /* If there is no available descriptors, just do nothing.
+ * The buffer will be handled by next arrived UDP packet,
+ * or next kick on receive virtq. */
+ if (rx_vq->last_avail_index == avail_index) {
+ DPRINT("Got UDP packet, but no available descriptors on RX virtq.\n");
+ return;
+ }
+
+ memset(buf, 0, hdrlen);
+ /* TODO: support mergeable buffers. */
+ if (hdrlen == 12)
+ hdr->num_buffers = 1;
+ len = vubr_backend_udp_recvbuf(dev, buf + hdrlen, buflen - hdrlen);
+
+ vubr_post_buffer(dev, rx_vq, buf, len + hdrlen);
+}
+
+static void
+vubr_kick_cb(int sock, void *ctx)
+{
+ VubrDev *dev = (VubrDev *) ctx;
+ eventfd_t kick_data;
+ ssize_t rc;
+
+ rc = eventfd_read(sock, &kick_data);
+ if (rc == -1) {
+ vubr_die("eventfd_read()");
+ } else {
+ DPRINT("Got kick_data: %016"PRIx64"\n", kick_data);
+ vubr_process_avail(dev, &dev->vq[1]);
+ }
+}
+
+static int
+vubr_none_exec(VubrDev *dev, VhostUserMsg *vmsg)
+{
+ DPRINT("Function %s() not implemented yet.\n", __func__);
+ return 0;
+}
+
+static int
+vubr_get_features_exec(VubrDev *dev, VhostUserMsg *vmsg)
+{
+ vmsg->payload.u64 =
+ ((1ULL << VIRTIO_NET_F_MRG_RXBUF) |
+ (1ULL << VHOST_F_LOG_ALL) |
+ (1ULL << VIRTIO_NET_F_GUEST_ANNOUNCE) |
+ (1ULL << VHOST_USER_F_PROTOCOL_FEATURES));
+
+ vmsg->size = sizeof(vmsg->payload.u64);
+
+ DPRINT("Sending back to guest u64: 0x%016"PRIx64"\n", vmsg->payload.u64);
+
+ /* Reply */
+ return 1;
+}
+
+static int
+vubr_set_features_exec(VubrDev *dev, VhostUserMsg *vmsg)
+{
+ DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64);
+
+ dev->features = vmsg->payload.u64;
+ if ((dev->features & (1ULL << VIRTIO_F_VERSION_1)) ||
+ (dev->features & (1ULL << VIRTIO_NET_F_MRG_RXBUF))) {
+ dev->hdrlen = 12;
+ } else {
+ dev->hdrlen = 10;
+ }
+
+ return 0;
+}
+
+static int
+vubr_set_owner_exec(VubrDev *dev, VhostUserMsg *vmsg)
+{
+ return 0;
+}
+
+static void
+vubr_close_log(VubrDev *dev)
+{
+ if (dev->log_table) {
+ if (munmap(dev->log_table, dev->log_size) != 0) {
+ vubr_die("munmap()");
+ }
+
+ dev->log_table = 0;
+ }
+ if (dev->log_call_fd != -1) {
+ close(dev->log_call_fd);
+ dev->log_call_fd = -1;
+ }
+}
+
+static int
+vubr_reset_device_exec(VubrDev *dev, VhostUserMsg *vmsg)
+{
+ vubr_close_log(dev);
+ dev->ready = 0;
+ dev->features = 0;
+ return 0;
+}
+
+static int
+vubr_set_mem_table_exec(VubrDev *dev, VhostUserMsg *vmsg)
+{
+ int i;
+ VhostUserMemory *memory = &vmsg->payload.memory;
+ dev->nregions = memory->nregions;
+
+ DPRINT("Nregions: %d\n", memory->nregions);
+ for (i = 0; i < dev->nregions; i++) {
+ void *mmap_addr;
+ VhostUserMemoryRegion *msg_region = &memory->regions[i];
+ VubrDevRegion *dev_region = &dev->regions[i];
+
+ DPRINT("Region %d\n", i);
+ DPRINT(" guest_phys_addr: 0x%016"PRIx64"\n",
+ msg_region->guest_phys_addr);
+ DPRINT(" memory_size: 0x%016"PRIx64"\n",
+ msg_region->memory_size);
+ DPRINT(" userspace_addr 0x%016"PRIx64"\n",
+ msg_region->userspace_addr);
+ DPRINT(" mmap_offset 0x%016"PRIx64"\n",
+ msg_region->mmap_offset);
+
+ dev_region->gpa = msg_region->guest_phys_addr;
+ dev_region->size = msg_region->memory_size;
+ dev_region->qva = msg_region->userspace_addr;
+ dev_region->mmap_offset = msg_region->mmap_offset;
+
+ /* We don't use offset argument of mmap() since the
+ * mapped address has to be page aligned, and we use huge
+ * pages. */
+ mmap_addr = mmap(0, dev_region->size + dev_region->mmap_offset,
+ PROT_READ | PROT_WRITE, MAP_SHARED,
+ vmsg->fds[i], 0);
+
+ if (mmap_addr == MAP_FAILED) {
+ vubr_die("mmap");
+ }
+ dev_region->mmap_addr = (uint64_t)(uintptr_t)mmap_addr;
+ DPRINT(" mmap_addr: 0x%016"PRIx64"\n", dev_region->mmap_addr);
+
+ close(vmsg->fds[i]);
+ }
+
+ return 0;
+}
+
+static int
+vubr_set_log_base_exec(VubrDev *dev, VhostUserMsg *vmsg)
+{
+ int fd;
+ uint64_t log_mmap_size, log_mmap_offset;
+ void *rc;
+
+ assert(vmsg->fd_num == 1);
+ fd = vmsg->fds[0];
+
+ assert(vmsg->size == sizeof(vmsg->payload.log));
+ log_mmap_offset = vmsg->payload.log.mmap_offset;
+ log_mmap_size = vmsg->payload.log.mmap_size;
+ DPRINT("Log mmap_offset: %"PRId64"\n", log_mmap_offset);
+ DPRINT("Log mmap_size: %"PRId64"\n", log_mmap_size);
+
+ rc = mmap(0, log_mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd,
+ log_mmap_offset);
+ if (rc == MAP_FAILED) {
+ vubr_die("mmap");
+ }
+ dev->log_table = rc;
+ dev->log_size = log_mmap_size;
+
+ vmsg->size = sizeof(vmsg->payload.u64);
+ /* Reply */
+ return 1;
+}
+
+static int
+vubr_set_log_fd_exec(VubrDev *dev, VhostUserMsg *vmsg)
+{
+ assert(vmsg->fd_num == 1);
+ dev->log_call_fd = vmsg->fds[0];
+ DPRINT("Got log_call_fd: %d\n", vmsg->fds[0]);
+ return 0;
+}
+
+static int
+vubr_set_vring_num_exec(VubrDev *dev, VhostUserMsg *vmsg)
+{
+ unsigned int index = vmsg->payload.state.index;
+ unsigned int num = vmsg->payload.state.num;
+
+ DPRINT("State.index: %d\n", index);
+ DPRINT("State.num: %d\n", num);
+ dev->vq[index].size = num;
+ return 0;
+}
+
+static int
+vubr_set_vring_addr_exec(VubrDev *dev, VhostUserMsg *vmsg)
+{
+ struct vhost_vring_addr *vra = &vmsg->payload.addr;
+ unsigned int index = vra->index;
+ VubrVirtq *vq = &dev->vq[index];
+
+ DPRINT("vhost_vring_addr:\n");
+ DPRINT(" index: %d\n", vra->index);
+ DPRINT(" flags: %d\n", vra->flags);
+ DPRINT(" desc_user_addr: 0x%016llx\n", vra->desc_user_addr);
+ DPRINT(" used_user_addr: 0x%016llx\n", vra->used_user_addr);
+ DPRINT(" avail_user_addr: 0x%016llx\n", vra->avail_user_addr);
+ DPRINT(" log_guest_addr: 0x%016llx\n", vra->log_guest_addr);
+
+ vq->desc = (struct vring_desc *)(uintptr_t)qva_to_va(dev, vra->desc_user_addr);
+ vq->used = (struct vring_used *)(uintptr_t)qva_to_va(dev, vra->used_user_addr);
+ vq->avail = (struct vring_avail *)(uintptr_t)qva_to_va(dev, vra->avail_user_addr);
+ vq->log_guest_addr = vra->log_guest_addr;
+
+ DPRINT("Setting virtq addresses:\n");
+ DPRINT(" vring_desc at %p\n", vq->desc);
+ DPRINT(" vring_used at %p\n", vq->used);
+ DPRINT(" vring_avail at %p\n", vq->avail);
+
+ vq->last_used_index = vq->used->idx;
+ return 0;
+}
+
+static int
+vubr_set_vring_base_exec(VubrDev *dev, VhostUserMsg *vmsg)
+{
+ unsigned int index = vmsg->payload.state.index;
+ unsigned int num = vmsg->payload.state.num;
+
+ DPRINT("State.index: %d\n", index);
+ DPRINT("State.num: %d\n", num);
+ dev->vq[index].last_avail_index = num;
+
+ return 0;
+}
+
+static int
+vubr_get_vring_base_exec(VubrDev *dev, VhostUserMsg *vmsg)
+{
+ unsigned int index = vmsg->payload.state.index;
+
+ DPRINT("State.index: %d\n", index);
+ vmsg->payload.state.num = dev->vq[index].last_avail_index;
+ vmsg->size = sizeof(vmsg->payload.state);
+ /* FIXME: this is a work-around for a bug in QEMU enabling
+ * too early vrings. When protocol features are enabled,
+ * we have to respect * VHOST_USER_SET_VRING_ENABLE request. */
+ dev->ready = 0;
+
+ if (dev->vq[index].call_fd != -1) {
+ close(dev->vq[index].call_fd);
+ dispatcher_remove(&dev->dispatcher, dev->vq[index].call_fd);
+ dev->vq[index].call_fd = -1;
+ }
+ if (dev->vq[index].kick_fd != -1) {
+ close(dev->vq[index].kick_fd);
+ dispatcher_remove(&dev->dispatcher, dev->vq[index].kick_fd);
+ dev->vq[index].kick_fd = -1;
+ }
+
+ /* Reply */
+ return 1;
+}
+
+static int
+vubr_set_vring_kick_exec(VubrDev *dev, VhostUserMsg *vmsg)
+{
+ uint64_t u64_arg = vmsg->payload.u64;
+ int index = u64_arg & VHOST_USER_VRING_IDX_MASK;
+
+ DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64);
+
+ assert((u64_arg & VHOST_USER_VRING_NOFD_MASK) == 0);
+ assert(vmsg->fd_num == 1);
+
+ if (dev->vq[index].kick_fd != -1) {
+ close(dev->vq[index].kick_fd);
+ dispatcher_remove(&dev->dispatcher, dev->vq[index].kick_fd);
+ }
+ dev->vq[index].kick_fd = vmsg->fds[0];
+ DPRINT("Got kick_fd: %d for vq: %d\n", vmsg->fds[0], index);
+
+ if (index % 2 == 1) {
+ /* TX queue. */
+ dispatcher_add(&dev->dispatcher, dev->vq[index].kick_fd,
+ dev, vubr_kick_cb);
+
+ DPRINT("Waiting for kicks on fd: %d for vq: %d\n",
+ dev->vq[index].kick_fd, index);
+ }
+ /* We temporarily use this hack to determine that both TX and RX
+ * queues are set up and ready for processing.
+ * FIXME: we need to rely in VHOST_USER_SET_VRING_ENABLE and
+ * actual kicks. */
+ if (dev->vq[0].kick_fd != -1 &&
+ dev->vq[1].kick_fd != -1) {
+ dev->ready = 1;
+ DPRINT("vhost-user-bridge is ready for processing queues.\n");
+ }
+ return 0;
+
+}
+
+static int
+vubr_set_vring_call_exec(VubrDev *dev, VhostUserMsg *vmsg)
+{
+ uint64_t u64_arg = vmsg->payload.u64;
+ int index = u64_arg & VHOST_USER_VRING_IDX_MASK;
+
+ DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64);
+ assert((u64_arg & VHOST_USER_VRING_NOFD_MASK) == 0);
+ assert(vmsg->fd_num == 1);
+
+ if (dev->vq[index].call_fd != -1) {
+ close(dev->vq[index].call_fd);
+ dispatcher_remove(&dev->dispatcher, dev->vq[index].call_fd);
+ }
+ dev->vq[index].call_fd = vmsg->fds[0];
+ DPRINT("Got call_fd: %d for vq: %d\n", vmsg->fds[0], index);
+
+ return 0;
+}
+
+static int
+vubr_set_vring_err_exec(VubrDev *dev, VhostUserMsg *vmsg)
+{
+ DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64);
+ return 0;
+}
+
+static int
+vubr_get_protocol_features_exec(VubrDev *dev, VhostUserMsg *vmsg)
+{
+ vmsg->payload.u64 = 1ULL << VHOST_USER_PROTOCOL_F_LOG_SHMFD;
+ DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64);
+ vmsg->size = sizeof(vmsg->payload.u64);
+
+ /* Reply */
+ return 1;
+}
+
+static int
+vubr_set_protocol_features_exec(VubrDev *dev, VhostUserMsg *vmsg)
+{
+ /* FIXME: unimplented */
+ DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64);
+ return 0;
+}
+
+static int
+vubr_get_queue_num_exec(VubrDev *dev, VhostUserMsg *vmsg)
+{
+ DPRINT("Function %s() not implemented yet.\n", __func__);
+ return 0;
+}
+
+static int
+vubr_set_vring_enable_exec(VubrDev *dev, VhostUserMsg *vmsg)
+{
+ unsigned int index = vmsg->payload.state.index;
+ unsigned int enable = vmsg->payload.state.num;
+
+ DPRINT("State.index: %d\n", index);
+ DPRINT("State.enable: %d\n", enable);
+ dev->vq[index].enable = enable;
+ return 0;
+}
+
+static int
+vubr_send_rarp_exec(VubrDev *dev, VhostUserMsg *vmsg)
+{
+ DPRINT("Function %s() not implemented yet.\n", __func__);
+ return 0;
+}
+
+static int
+vubr_execute_request(VubrDev *dev, VhostUserMsg *vmsg)
+{
+ /* Print out generic part of the request. */
+ DPRINT(
+ "================== Vhost user message from QEMU ==================\n");
+ DPRINT("Request: %s (%d)\n", vubr_request_str[vmsg->request],
+ vmsg->request);
+ DPRINT("Flags: 0x%x\n", vmsg->flags);
+ DPRINT("Size: %d\n", vmsg->size);
+
+ if (vmsg->fd_num) {
+ int i;
+ DPRINT("Fds:");
+ for (i = 0; i < vmsg->fd_num; i++) {
+ DPRINT(" %d", vmsg->fds[i]);
+ }
+ DPRINT("\n");
+ }
+
+ switch (vmsg->request) {
+ case VHOST_USER_NONE:
+ return vubr_none_exec(dev, vmsg);
+ case VHOST_USER_GET_FEATURES:
+ return vubr_get_features_exec(dev, vmsg);
+ case VHOST_USER_SET_FEATURES:
+ return vubr_set_features_exec(dev, vmsg);
+ case VHOST_USER_SET_OWNER:
+ return vubr_set_owner_exec(dev, vmsg);
+ case VHOST_USER_RESET_OWNER:
+ return vubr_reset_device_exec(dev, vmsg);
+ case VHOST_USER_SET_MEM_TABLE:
+ return vubr_set_mem_table_exec(dev, vmsg);
+ case VHOST_USER_SET_LOG_BASE:
+ return vubr_set_log_base_exec(dev, vmsg);
+ case VHOST_USER_SET_LOG_FD:
+ return vubr_set_log_fd_exec(dev, vmsg);
+ case VHOST_USER_SET_VRING_NUM:
+ return vubr_set_vring_num_exec(dev, vmsg);
+ case VHOST_USER_SET_VRING_ADDR:
+ return vubr_set_vring_addr_exec(dev, vmsg);
+ case VHOST_USER_SET_VRING_BASE:
+ return vubr_set_vring_base_exec(dev, vmsg);
+ case VHOST_USER_GET_VRING_BASE:
+ return vubr_get_vring_base_exec(dev, vmsg);
+ case VHOST_USER_SET_VRING_KICK:
+ return vubr_set_vring_kick_exec(dev, vmsg);
+ case VHOST_USER_SET_VRING_CALL:
+ return vubr_set_vring_call_exec(dev, vmsg);
+ case VHOST_USER_SET_VRING_ERR:
+ return vubr_set_vring_err_exec(dev, vmsg);
+ case VHOST_USER_GET_PROTOCOL_FEATURES:
+ return vubr_get_protocol_features_exec(dev, vmsg);
+ case VHOST_USER_SET_PROTOCOL_FEATURES:
+ return vubr_set_protocol_features_exec(dev, vmsg);
+ case VHOST_USER_GET_QUEUE_NUM:
+ return vubr_get_queue_num_exec(dev, vmsg);
+ case VHOST_USER_SET_VRING_ENABLE:
+ return vubr_set_vring_enable_exec(dev, vmsg);
+ case VHOST_USER_SEND_RARP:
+ return vubr_send_rarp_exec(dev, vmsg);
+
+ case VHOST_USER_MAX:
+ assert(vmsg->request != VHOST_USER_MAX);
+ }
+ return 0;
+}
+
+static void
+vubr_receive_cb(int sock, void *ctx)
+{
+ VubrDev *dev = (VubrDev *) ctx;
+ VhostUserMsg vmsg;
+ int reply_requested;
+
+ vubr_message_read(sock, &vmsg);
+ reply_requested = vubr_execute_request(dev, &vmsg);
+ if (reply_requested) {
+ /* Set the version in the flags when sending the reply */
+ vmsg.flags &= ~VHOST_USER_VERSION_MASK;
+ vmsg.flags |= VHOST_USER_VERSION;
+ vmsg.flags |= VHOST_USER_REPLY_MASK;
+ vubr_message_write(sock, &vmsg);
+ }
+}
+
+static void
+vubr_accept_cb(int sock, void *ctx)
+{
+ VubrDev *dev = (VubrDev *)ctx;
+ int conn_fd;
+ struct sockaddr_un un;
+ socklen_t len = sizeof(un);
+
+ conn_fd = accept(sock, (struct sockaddr *) &un, &len);
+ if (conn_fd == -1) {
+ vubr_die("accept()");
+ }
+ DPRINT("Got connection from remote peer on sock %d\n", conn_fd);
+ dispatcher_add(&dev->dispatcher, conn_fd, ctx, vubr_receive_cb);
+}
+
+static VubrDev *
+vubr_new(const char *path)
+{
+ VubrDev *dev = (VubrDev *) calloc(1, sizeof(VubrDev));
+ dev->nregions = 0;
+ int i;
+ struct sockaddr_un un;
+ size_t len;
+
+ for (i = 0; i < MAX_NR_VIRTQUEUE; i++) {
+ dev->vq[i] = (VubrVirtq) {
+ .call_fd = -1, .kick_fd = -1,
+ .size = 0,
+ .last_avail_index = 0, .last_used_index = 0,
+ .desc = 0, .avail = 0, .used = 0,
+ .enable = 0,
+ };
+ }
+
+ /* Init log */
+ dev->log_call_fd = -1;
+ dev->log_size = 0;
+ dev->log_table = 0;
+ dev->ready = 0;
+ dev->features = 0;
+
+ /* Get a UNIX socket. */
+ dev->sock = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (dev->sock == -1) {
+ vubr_die("socket");
+ }
+
+ un.sun_family = AF_UNIX;
+ strcpy(un.sun_path, path);
+ len = sizeof(un.sun_family) + strlen(path);
+ unlink(path);
+
+ if (bind(dev->sock, (struct sockaddr *) &un, len) == -1) {
+ vubr_die("bind");
+ }
+
+ if (listen(dev->sock, 1) == -1) {
+ vubr_die("listen");
+ }
+
+ dispatcher_init(&dev->dispatcher);
+ dispatcher_add(&dev->dispatcher, dev->sock, (void *)dev,
+ vubr_accept_cb);
+
+ DPRINT("Waiting for connections on UNIX socket %s ...\n", path);
+ return dev;
+}
+
+static void
+vubr_set_host(struct sockaddr_in *saddr, const char *host)
+{
+ if (isdigit(host[0])) {
+ if (!inet_aton(host, &saddr->sin_addr)) {
+ fprintf(stderr, "inet_aton() failed.\n");
+ exit(1);
+ }
+ } else {
+ struct hostent *he = gethostbyname(host);
+
+ if (!he) {
+ fprintf(stderr, "gethostbyname() failed.\n");
+ exit(1);
+ }
+ saddr->sin_addr = *(struct in_addr *)he->h_addr;
+ }
+}
+
+static void
+vubr_backend_udp_setup(VubrDev *dev,
+ const char *local_host,
+ const char *local_port,
+ const char *remote_host,
+ const char *remote_port)
+{
+ int sock;
+ const char *r;
+
+ int lport, rport;
+
+ lport = strtol(local_port, (char **)&r, 0);
+ if (r == local_port) {
+ fprintf(stderr, "lport parsing failed.\n");
+ exit(1);
+ }
+
+ rport = strtol(remote_port, (char **)&r, 0);
+ if (r == remote_port) {
+ fprintf(stderr, "rport parsing failed.\n");
+ exit(1);
+ }
+
+ struct sockaddr_in si_local = {
+ .sin_family = AF_INET,
+ .sin_port = htons(lport),
+ };
+
+ vubr_set_host(&si_local, local_host);
+
+ /* setup destination for sends */
+ dev->backend_udp_dest = (struct sockaddr_in) {
+ .sin_family = AF_INET,
+ .sin_port = htons(rport),
+ };
+ vubr_set_host(&dev->backend_udp_dest, remote_host);
+
+ sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+ if (sock == -1) {
+ vubr_die("socket");
+ }
+
+ if (bind(sock, (struct sockaddr *)&si_local, sizeof(si_local)) == -1) {
+ vubr_die("bind");
+ }
+
+ dev->backend_udp_sock = sock;
+ dispatcher_add(&dev->dispatcher, sock, dev, vubr_backend_recv_cb);
+ DPRINT("Waiting for data from udp backend on %s:%d...\n",
+ local_host, lport);
+}
+
+static void
+vubr_run(VubrDev *dev)
+{
+ while (1) {
+ /* timeout 200ms */
+ dispatcher_wait(&dev->dispatcher, 200000);
+ /* Here one can try polling strategy. */
+ }
+}
+
+static int
+vubr_parse_host_port(const char **host, const char **port, const char *buf)
+{
+ char *p = strchr(buf, ':');
+
+ if (!p) {
+ return -1;
+ }
+ *p = '\0';
+ *host = strdup(buf);
+ *port = strdup(p + 1);
+ return 0;
+}
+
+#define DEFAULT_UD_SOCKET "/tmp/vubr.sock"
+#define DEFAULT_LHOST "127.0.0.1"
+#define DEFAULT_LPORT "4444"
+#define DEFAULT_RHOST "127.0.0.1"
+#define DEFAULT_RPORT "5555"
+
+static const char *ud_socket_path = DEFAULT_UD_SOCKET;
+static const char *lhost = DEFAULT_LHOST;
+static const char *lport = DEFAULT_LPORT;
+static const char *rhost = DEFAULT_RHOST;
+static const char *rport = DEFAULT_RPORT;
+
+int
+main(int argc, char *argv[])
+{
+ VubrDev *dev;
+ int opt;
+
+ while ((opt = getopt(argc, argv, "l:r:u:")) != -1) {
+
+ switch (opt) {
+ case 'l':
+ if (vubr_parse_host_port(&lhost, &lport, optarg) < 0) {
+ goto out;
+ }
+ break;
+ case 'r':
+ if (vubr_parse_host_port(&rhost, &rport, optarg) < 0) {
+ goto out;
+ }
+ break;
+ case 'u':
+ ud_socket_path = strdup(optarg);
+ break;
+ default:
+ goto out;
+ }
+ }
+
+ DPRINT("ud socket: %s\n", ud_socket_path);
+ DPRINT("local: %s:%s\n", lhost, lport);
+ DPRINT("remote: %s:%s\n", rhost, rport);
+
+ dev = vubr_new(ud_socket_path);
+ if (!dev) {
+ return 1;
+ }
+
+ vubr_backend_udp_setup(dev, lhost, lport, rhost, rport);
+ vubr_run(dev);
+ return 0;
+
+out:
+ fprintf(stderr, "Usage: %s ", argv[0]);
+ fprintf(stderr, "[-u ud_socket_path] [-l lhost:lport] [-r rhost:rport]\n");
+ fprintf(stderr, "\t-u path to unix doman socket. default: %s\n",
+ DEFAULT_UD_SOCKET);
+ fprintf(stderr, "\t-l local host and port. default: %s:%s\n",
+ DEFAULT_LHOST, DEFAULT_LPORT);
+ fprintf(stderr, "\t-r remote host and port. default: %s:%s\n",
+ DEFAULT_RHOST, DEFAULT_RPORT);
+
+ return 1;
+}
Code Review / kvmfornfv.git / blobdiff