qemu-e2k/net/dgram.c

624 lines
19 KiB
C

/*
* QEMU System Emulator
*
* Copyright (c) 2003-2008 Fabrice Bellard
* Copyright (c) 2022 Red Hat, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "net/net.h"
#include "clients.h"
#include "monitor/monitor.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "qemu/option.h"
#include "qemu/sockets.h"
#include "qemu/iov.h"
#include "qemu/main-loop.h"
#include "qemu/cutils.h"
typedef struct NetDgramState {
NetClientState nc;
int fd;
SocketReadState rs;
bool read_poll; /* waiting to receive data? */
bool write_poll; /* waiting to transmit data? */
/* contains destination iff connectionless */
struct sockaddr *dest_addr;
socklen_t dest_len;
} NetDgramState;
static void net_dgram_send(void *opaque);
static void net_dgram_writable(void *opaque);
static void net_dgram_update_fd_handler(NetDgramState *s)
{
qemu_set_fd_handler(s->fd,
s->read_poll ? net_dgram_send : NULL,
s->write_poll ? net_dgram_writable : NULL,
s);
}
static void net_dgram_read_poll(NetDgramState *s, bool enable)
{
s->read_poll = enable;
net_dgram_update_fd_handler(s);
}
static void net_dgram_write_poll(NetDgramState *s, bool enable)
{
s->write_poll = enable;
net_dgram_update_fd_handler(s);
}
static void net_dgram_writable(void *opaque)
{
NetDgramState *s = opaque;
net_dgram_write_poll(s, false);
qemu_flush_queued_packets(&s->nc);
}
static ssize_t net_dgram_receive(NetClientState *nc,
const uint8_t *buf, size_t size)
{
NetDgramState *s = DO_UPCAST(NetDgramState, nc, nc);
ssize_t ret;
do {
if (s->dest_addr) {
ret = sendto(s->fd, buf, size, 0, s->dest_addr, s->dest_len);
} else {
ret = send(s->fd, buf, size, 0);
}
} while (ret == -1 && errno == EINTR);
if (ret == -1 && errno == EAGAIN) {
net_dgram_write_poll(s, true);
return 0;
}
return ret;
}
static void net_dgram_send_completed(NetClientState *nc, ssize_t len)
{
NetDgramState *s = DO_UPCAST(NetDgramState, nc, nc);
if (!s->read_poll) {
net_dgram_read_poll(s, true);
}
}
static void net_dgram_rs_finalize(SocketReadState *rs)
{
NetDgramState *s = container_of(rs, NetDgramState, rs);
if (qemu_send_packet_async(&s->nc, rs->buf,
rs->packet_len,
net_dgram_send_completed) == 0) {
net_dgram_read_poll(s, false);
}
}
static void net_dgram_send(void *opaque)
{
NetDgramState *s = opaque;
int size;
size = recv(s->fd, s->rs.buf, sizeof(s->rs.buf), 0);
if (size < 0) {
return;
}
if (size == 0) {
/* end of connection */
net_dgram_read_poll(s, false);
net_dgram_write_poll(s, false);
return;
}
if (qemu_send_packet_async(&s->nc, s->rs.buf, size,
net_dgram_send_completed) == 0) {
net_dgram_read_poll(s, false);
}
}
static int net_dgram_mcast_create(struct sockaddr_in *mcastaddr,
struct in_addr *localaddr,
Error **errp)
{
struct ip_mreq imr;
int fd;
int val, ret;
#ifdef __OpenBSD__
unsigned char loop;
#else
int loop;
#endif
if (!IN_MULTICAST(ntohl(mcastaddr->sin_addr.s_addr))) {
error_setg(errp, "specified mcastaddr %s (0x%08x) "
"does not contain a multicast address",
inet_ntoa(mcastaddr->sin_addr),
(int)ntohl(mcastaddr->sin_addr.s_addr));
return -1;
}
fd = qemu_socket(PF_INET, SOCK_DGRAM, 0);
if (fd < 0) {
error_setg_errno(errp, errno, "can't create datagram socket");
return -1;
}
/*
* Allow multiple sockets to bind the same multicast ip and port by setting
* SO_REUSEADDR. This is the only situation where SO_REUSEADDR should be set
* on windows. Use socket_set_fast_reuse otherwise as it sets SO_REUSEADDR
* only on posix systems.
*/
val = 1;
ret = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
if (ret < 0) {
error_setg_errno(errp, errno, "can't set socket option SO_REUSEADDR");
goto fail;
}
ret = bind(fd, (struct sockaddr *)mcastaddr, sizeof(*mcastaddr));
if (ret < 0) {
error_setg_errno(errp, errno, "can't bind ip=%s to socket",
inet_ntoa(mcastaddr->sin_addr));
goto fail;
}
/* Add host to multicast group */
imr.imr_multiaddr = mcastaddr->sin_addr;
if (localaddr) {
imr.imr_interface = *localaddr;
} else {
imr.imr_interface.s_addr = htonl(INADDR_ANY);
}
ret = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
&imr, sizeof(struct ip_mreq));
if (ret < 0) {
error_setg_errno(errp, errno,
"can't add socket to multicast group %s",
inet_ntoa(imr.imr_multiaddr));
goto fail;
}
/* Force mcast msgs to loopback (eg. several QEMUs in same host */
loop = 1;
ret = setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP,
&loop, sizeof(loop));
if (ret < 0) {
error_setg_errno(errp, errno,
"can't force multicast message to loopback");
goto fail;
}
/* If a bind address is given, only send packets from that address */
if (localaddr != NULL) {
ret = setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF,
localaddr, sizeof(*localaddr));
if (ret < 0) {
error_setg_errno(errp, errno,
"can't set the default network send interface");
goto fail;
}
}
qemu_socket_set_nonblock(fd);
return fd;
fail:
if (fd >= 0) {
closesocket(fd);
}
return -1;
}
static void net_dgram_cleanup(NetClientState *nc)
{
NetDgramState *s = DO_UPCAST(NetDgramState, nc, nc);
if (s->fd != -1) {
net_dgram_read_poll(s, false);
net_dgram_write_poll(s, false);
close(s->fd);
s->fd = -1;
}
g_free(s->dest_addr);
s->dest_addr = NULL;
s->dest_len = 0;
}
static NetClientInfo net_dgram_socket_info = {
.type = NET_CLIENT_DRIVER_DGRAM,
.size = sizeof(NetDgramState),
.receive = net_dgram_receive,
.cleanup = net_dgram_cleanup,
};
static NetDgramState *net_dgram_fd_init(NetClientState *peer,
const char *model,
const char *name,
int fd,
Error **errp)
{
NetClientState *nc;
NetDgramState *s;
nc = qemu_new_net_client(&net_dgram_socket_info, peer, model, name);
s = DO_UPCAST(NetDgramState, nc, nc);
s->fd = fd;
net_socket_rs_init(&s->rs, net_dgram_rs_finalize, false);
net_dgram_read_poll(s, true);
return s;
}
static int net_dgram_mcast_init(NetClientState *peer,
const char *model,
const char *name,
SocketAddress *remote,
SocketAddress *local,
Error **errp)
{
NetDgramState *s;
int fd, ret;
struct sockaddr_in *saddr;
if (remote->type != SOCKET_ADDRESS_TYPE_INET) {
error_setg(errp, "multicast only support inet type");
return -1;
}
saddr = g_new(struct sockaddr_in, 1);
if (convert_host_port(saddr, remote->u.inet.host, remote->u.inet.port,
errp) < 0) {
g_free(saddr);
return -1;
}
if (!local) {
fd = net_dgram_mcast_create(saddr, NULL, errp);
if (fd < 0) {
g_free(saddr);
return -1;
}
} else {
switch (local->type) {
case SOCKET_ADDRESS_TYPE_INET: {
struct in_addr localaddr;
if (inet_aton(local->u.inet.host, &localaddr) == 0) {
g_free(saddr);
error_setg(errp, "localaddr '%s' is not a valid IPv4 address",
local->u.inet.host);
return -1;
}
fd = net_dgram_mcast_create(saddr, &localaddr, errp);
if (fd < 0) {
g_free(saddr);
return -1;
}
break;
}
case SOCKET_ADDRESS_TYPE_FD: {
int newfd;
fd = monitor_fd_param(monitor_cur(), local->u.fd.str, errp);
if (fd == -1) {
g_free(saddr);
return -1;
}
ret = qemu_socket_try_set_nonblock(fd);
if (ret < 0) {
g_free(saddr);
error_setg_errno(errp, -ret, "%s: Can't use file descriptor %d",
name, fd);
return -1;
}
/*
* fd passed: multicast: "learn" dest_addr address from bound
* address and save it. Because this may be "shared" socket from a
* "master" process, datagrams would be recv() by ONLY ONE process:
* we must "clone" this dgram socket --jjo
*/
saddr = g_new(struct sockaddr_in, 1);
if (convert_host_port(saddr, local->u.inet.host, local->u.inet.port,
errp) < 0) {
g_free(saddr);
closesocket(fd);
return -1;
}
/* must be bound */
if (saddr->sin_addr.s_addr == 0) {
error_setg(errp, "can't setup multicast destination address");
g_free(saddr);
closesocket(fd);
return -1;
}
/* clone dgram socket */
newfd = net_dgram_mcast_create(saddr, NULL, errp);
if (newfd < 0) {
g_free(saddr);
closesocket(fd);
return -1;
}
/* clone newfd to fd, close newfd */
dup2(newfd, fd);
close(newfd);
break;
}
default:
g_free(saddr);
error_setg(errp, "only support inet or fd type for local");
return -1;
}
}
s = net_dgram_fd_init(peer, model, name, fd, errp);
if (!s) {
g_free(saddr);
return -1;
}
g_assert(s->dest_addr == NULL);
s->dest_addr = (struct sockaddr *)saddr;
s->dest_len = sizeof(*saddr);
if (!local) {
qemu_set_info_str(&s->nc, "mcast=%s:%d",
inet_ntoa(saddr->sin_addr),
ntohs(saddr->sin_port));
} else {
switch (local->type) {
case SOCKET_ADDRESS_TYPE_INET:
qemu_set_info_str(&s->nc, "mcast=%s:%d",
inet_ntoa(saddr->sin_addr),
ntohs(saddr->sin_port));
break;
case SOCKET_ADDRESS_TYPE_FD:
qemu_set_info_str(&s->nc, "fd=%d (cloned mcast=%s:%d)",
fd, inet_ntoa(saddr->sin_addr),
ntohs(saddr->sin_port));
break;
default:
g_assert_not_reached();
}
}
return 0;
}
int net_init_dgram(const Netdev *netdev, const char *name,
NetClientState *peer, Error **errp)
{
NetDgramState *s;
int fd, ret;
SocketAddress *remote, *local;
struct sockaddr *dest_addr;
struct sockaddr_in laddr_in, raddr_in;
struct sockaddr_un laddr_un, raddr_un;
socklen_t dest_len;
assert(netdev->type == NET_CLIENT_DRIVER_DGRAM);
remote = netdev->u.dgram.remote;
local = netdev->u.dgram.local;
/* detect multicast address */
if (remote && remote->type == SOCKET_ADDRESS_TYPE_INET) {
struct sockaddr_in mcastaddr;
if (convert_host_port(&mcastaddr, remote->u.inet.host,
remote->u.inet.port, errp) < 0) {
return -1;
}
if (IN_MULTICAST(ntohl(mcastaddr.sin_addr.s_addr))) {
return net_dgram_mcast_init(peer, "dram", name, remote, local,
errp);
}
}
/* unicast address */
if (!local) {
error_setg(errp, "dgram requires local= parameter");
return -1;
}
if (remote) {
if (local->type == SOCKET_ADDRESS_TYPE_FD) {
error_setg(errp, "don't set remote with local.fd");
return -1;
}
if (remote->type != local->type) {
error_setg(errp, "remote and local types must be the same");
return -1;
}
} else {
if (local->type != SOCKET_ADDRESS_TYPE_FD) {
error_setg(errp,
"type=inet or type=unix requires remote parameter");
return -1;
}
}
switch (local->type) {
case SOCKET_ADDRESS_TYPE_INET:
if (convert_host_port(&laddr_in, local->u.inet.host, local->u.inet.port,
errp) < 0) {
return -1;
}
if (convert_host_port(&raddr_in, remote->u.inet.host,
remote->u.inet.port, errp) < 0) {
return -1;
}
fd = qemu_socket(PF_INET, SOCK_DGRAM, 0);
if (fd < 0) {
error_setg_errno(errp, errno, "can't create datagram socket");
return -1;
}
ret = socket_set_fast_reuse(fd);
if (ret < 0) {
error_setg_errno(errp, errno,
"can't set socket option SO_REUSEADDR");
closesocket(fd);
return -1;
}
ret = bind(fd, (struct sockaddr *)&laddr_in, sizeof(laddr_in));
if (ret < 0) {
error_setg_errno(errp, errno, "can't bind ip=%s to socket",
inet_ntoa(laddr_in.sin_addr));
closesocket(fd);
return -1;
}
qemu_socket_set_nonblock(fd);
dest_len = sizeof(raddr_in);
dest_addr = g_malloc(dest_len);
memcpy(dest_addr, &raddr_in, dest_len);
break;
case SOCKET_ADDRESS_TYPE_UNIX:
ret = unlink(local->u.q_unix.path);
if (ret < 0 && errno != ENOENT) {
error_setg_errno(errp, errno, "failed to unlink socket %s",
local->u.q_unix.path);
return -1;
}
laddr_un.sun_family = PF_UNIX;
ret = snprintf(laddr_un.sun_path, sizeof(laddr_un.sun_path), "%s",
local->u.q_unix.path);
if (ret < 0 || ret >= sizeof(laddr_un.sun_path)) {
error_setg(errp, "UNIX socket path '%s' is too long",
local->u.q_unix.path);
error_append_hint(errp, "Path must be less than %zu bytes\n",
sizeof(laddr_un.sun_path));
}
raddr_un.sun_family = PF_UNIX;
ret = snprintf(raddr_un.sun_path, sizeof(raddr_un.sun_path), "%s",
remote->u.q_unix.path);
if (ret < 0 || ret >= sizeof(raddr_un.sun_path)) {
error_setg(errp, "UNIX socket path '%s' is too long",
remote->u.q_unix.path);
error_append_hint(errp, "Path must be less than %zu bytes\n",
sizeof(raddr_un.sun_path));
}
fd = qemu_socket(PF_UNIX, SOCK_DGRAM, 0);
if (fd < 0) {
error_setg_errno(errp, errno, "can't create datagram socket");
return -1;
}
ret = bind(fd, (struct sockaddr *)&laddr_un, sizeof(laddr_un));
if (ret < 0) {
error_setg_errno(errp, errno, "can't bind unix=%s to socket",
laddr_un.sun_path);
closesocket(fd);
return -1;
}
qemu_socket_set_nonblock(fd);
dest_len = sizeof(raddr_un);
dest_addr = g_malloc(dest_len);
memcpy(dest_addr, &raddr_un, dest_len);
break;
case SOCKET_ADDRESS_TYPE_FD:
fd = monitor_fd_param(monitor_cur(), local->u.fd.str, errp);
if (fd == -1) {
return -1;
}
ret = qemu_socket_try_set_nonblock(fd);
if (ret < 0) {
error_setg_errno(errp, -ret, "%s: Can't use file descriptor %d",
name, fd);
return -1;
}
dest_addr = NULL;
dest_len = 0;
break;
default:
error_setg(errp, "only support inet or fd type for local");
return -1;
}
s = net_dgram_fd_init(peer, "dgram", name, fd, errp);
if (!s) {
return -1;
}
if (remote) {
g_assert(s->dest_addr == NULL);
s->dest_addr = dest_addr;
s->dest_len = dest_len;
}
switch (local->type) {
case SOCKET_ADDRESS_TYPE_INET:
qemu_set_info_str(&s->nc, "udp=%s:%d/%s:%d",
inet_ntoa(laddr_in.sin_addr),
ntohs(laddr_in.sin_port),
inet_ntoa(raddr_in.sin_addr),
ntohs(raddr_in.sin_port));
break;
case SOCKET_ADDRESS_TYPE_UNIX:
qemu_set_info_str(&s->nc, "udp=%s:%s",
laddr_un.sun_path, raddr_un.sun_path);
break;
case SOCKET_ADDRESS_TYPE_FD: {
SocketAddress *sa;
SocketAddressType sa_type;
sa = socket_local_address(fd, errp);
if (sa) {
sa_type = sa->type;
qapi_free_SocketAddress(sa);
qemu_set_info_str(&s->nc, "fd=%d %s", fd,
SocketAddressType_str(sa_type));
} else {
qemu_set_info_str(&s->nc, "fd=%d", fd);
}
break;
}
default:
g_assert_not_reached();
}
return 0;
}