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'-net socket,mcast=' option support (initial patch by Juan Jose Ciarlante)

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1710 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2005-12-18 16:36:49 +00:00
parent 87022ff52b
commit 3d830459b1
2 changed files with 225 additions and 3 deletions
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38
qemu-doc.texi
View File

@ -282,8 +282,8 @@ Connect the VLAN @var{n} to a remote VLAN in another QEMU virtual
machine using a TCP socket connection. If @option{listen} is
specified, QEMU waits for incoming connections on @var{port}
(@var{host} is optional). @option{connect} is used to connect to
another QEMU instance using the @option{listen} option. @option{fd=h}
specifies an already opened socket.
another QEMU instance using the @option{listen} option. @option{fd=h}
specifies an already opened TCP socket.
Example:
@example
@ -293,6 +293,40 @@ qemu linux.img -net nic,macaddr=52:54:00:12:34:56 -net socket,listen=:1234
qemu linux.img -net nic,macaddr=52:54:00:12:34:57 -net socket,connect=127.0.0.1:1234
@end example
@item -net socket[,vlan=n][,fd=h][,mcast=maddr:port]
Create a VLAN @var{n} shared with another QEMU virtual
machines using a UDP multicast socket, effectively making a bus for
every QEMU with same multicast address @var{maddr} and @var{port}.
NOTES:
@enumerate
@item
Several QEMU can be running on different hosts and share same bus (assuming
correct multicast setup for these hosts).
@item
mcast support is compatible with User Mode Linux (argument @option{eth@var{N}=mcast}), see
@url{http://user-mode-linux.sf.net}.
@item Use @option{fd=h} to specify an already opened UDP multicast socket.
@end enumerate
Example:
@example
# launch one QEMU instance
qemu linux.img -net nic,macaddr=52:54:00:12:34:56 -net socket,mcast=230.0.0.1:1234
# launch another QEMU instance on same "bus"
qemu linux.img -net nic,macaddr=52:54:00:12:34:57 -net socket,mcast=230.0.0.1:1234
# launch yet another QEMU instance on same "bus"
qemu linux.img -net nic,macaddr=52:54:00:12:34:58 -net socket,mcast=230.0.0.1:1234
@end example
Example (User Mode Linux compat.):
@example
# launch QEMU instance (note mcast address selected is UML's default)
qemu linux.img -net nic,macaddr=52:54:00:12:34:56 -net socket,mcast=239.192.168.1:1102
# launch UML
/path/to/linux ubd0=/path/to/root_fs eth0=mcast
@end example
@item -net none
Indicate that no network devices should be configured. It is used to
override the default configuration which is activated if no

190
vl.c
View File

@ -2133,6 +2133,7 @@ typedef struct NetSocketState {
int index;
int packet_len;
uint8_t buf[4096];
struct sockaddr_in dgram_dst; /* contains inet host and port destination iff connectionless (SOCK_DGRAM) */
} NetSocketState;
typedef struct NetSocketListenState {
@ -2151,6 +2152,13 @@ static void net_socket_receive(void *opaque, const uint8_t *buf, int size)
unix_write(s->fd, buf, size);
}
static void net_socket_receive_dgram(void *opaque, const uint8_t *buf, int size)
{
NetSocketState *s = opaque;
sendto(s->fd, buf, size, 0,
(struct sockaddr *)&s->dgram_dst, sizeof(s->dgram_dst));
}
static void net_socket_send(void *opaque)
{
NetSocketState *s = opaque;
@ -2203,13 +2211,140 @@ static void net_socket_send(void *opaque)
}
}
static void net_socket_send_dgram(void *opaque)
{
NetSocketState *s = opaque;
int size;
size = recv(s->fd, s->buf, sizeof(s->buf), 0);
if (size < 0)
return;
if (size == 0) {
/* end of connection */
qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
return;
}
qemu_send_packet(s->vc, s->buf, size);
}
static int net_socket_mcast_create(struct sockaddr_in *mcastaddr)
{
struct ip_mreq imr;
int fd;
int val, ret;
if (!IN_MULTICAST(ntohl(mcastaddr->sin_addr.s_addr))) {
fprintf(stderr, "qemu: error: specified mcastaddr \"%s\" (0x%08x) does not contain a multicast address\n",
inet_ntoa(mcastaddr->sin_addr), ntohl(mcastaddr->sin_addr.s_addr));
return -1;
}
fd = socket(PF_INET, SOCK_DGRAM, 0);
if (fd < 0) {
perror("socket(PF_INET, SOCK_DGRAM)");
return -1;
}
/* Add host to multicast group */
imr.imr_multiaddr = mcastaddr->sin_addr;
imr.imr_interface.s_addr = htonl(INADDR_ANY);
ret = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (void *) &imr, sizeof(struct ip_mreq));
if (ret < 0) {
perror("setsockopt(IP_ADD_MEMBERSHIP)");
goto fail;
}
/* Force mcast msgs to loopback (eg. several QEMUs in same host */
val = 1;
ret=setsockopt(fd, SOL_IP, IP_MULTICAST_LOOP, &val, sizeof(val));
if (ret < 0) {
perror("setsockopt(SOL_IP, IP_MULTICAST_LOOP)");
goto fail;
}
ret=setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
if (ret < 0) {
perror("setsockopt(SOL_SOCKET, SO_REUSEADDR)");
goto fail;
}
ret = bind(fd, (struct sockaddr *)mcastaddr, sizeof(*mcastaddr));
if (ret < 0) {
perror("bind");
goto fail;
}
fcntl(fd, F_SETFL, O_NONBLOCK);
return fd;
fail:
if (fd>=0) close(fd);
return -1;
}
static NetSocketState *net_socket_fd_init_dgram(VLANState *vlan, int fd,
int is_connected)
{
struct sockaddr_in saddr;
int newfd;
socklen_t saddr_len;
NetSocketState *s;
/* fd passed: multicast: "learn" dgram_dst 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
*/
if (is_connected) {
if (getsockname(fd, (struct sockaddr *) &saddr, &saddr_len) == 0) {
/* must be bound */
if (saddr.sin_addr.s_addr==0) {
fprintf(stderr, "qemu: error: init_dgram: fd=%d unbound, cannot setup multicast dst addr\n",
fd);
return NULL;
}
/* clone dgram socket */
newfd = net_socket_mcast_create(&saddr);
if (newfd < 0) {
/* error already reported by net_socket_mcast_create() */
close(fd);
return NULL;
}
/* clone newfd to fd, close newfd */
dup2(newfd, fd);
close(newfd);
} else {
fprintf(stderr, "qemu: error: init_dgram: fd=%d failed getsockname(): %s\n",
fd, strerror(errno));
return NULL;
}
}
s = qemu_mallocz(sizeof(NetSocketState));
if (!s)
return NULL;
s->fd = fd;
s->vc = qemu_new_vlan_client(vlan, net_socket_receive_dgram, s);
qemu_set_fd_handler(s->fd, net_socket_send_dgram, NULL, s);
/* mcast: save bound address as dst */
if (is_connected) s->dgram_dst=saddr;
snprintf(s->vc->info_str, sizeof(s->vc->info_str),
"socket: fd=%d (%s mcast=%s:%d)",
fd, is_connected? "cloned" : "",
inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
return s;
}
static void net_socket_connect(void *opaque)
{
NetSocketState *s = opaque;
qemu_set_fd_handler(s->fd, net_socket_send, NULL, s);
}
static NetSocketState *net_socket_fd_init(VLANState *vlan, int fd,
static NetSocketState *net_socket_fd_init_stream(VLANState *vlan, int fd,
int is_connected)
{
NetSocketState *s;
@ -2229,6 +2364,28 @@ static NetSocketState *net_socket_fd_init(VLANState *vlan, int fd,
return s;
}
static NetSocketState *net_socket_fd_init(VLANState *vlan, int fd,
int is_connected)
{
int so_type=-1, optlen=sizeof(so_type);
if(getsockopt(fd, SOL_SOCKET,SO_TYPE, &so_type, &optlen)< 0) {
fprintf(stderr, "qemu: error: setsockopt(SO_TYPE) for fd=%d failed\n", fd);
return NULL;
}
switch(so_type) {
case SOCK_DGRAM:
return net_socket_fd_init_dgram(vlan, fd, is_connected);
case SOCK_STREAM:
return net_socket_fd_init_stream(vlan, fd, is_connected);
default:
/* who knows ... this could be a eg. a pty, do warn and continue as stream */
fprintf(stderr, "qemu: warning: socket type=%d for fd=%d is not SOCK_DGRAM or SOCK_STREAM\n", so_type, fd);
return net_socket_fd_init_stream(vlan, fd, is_connected);
}
return NULL;
}
static void net_socket_accept(void *opaque)
{
NetSocketListenState *s = opaque;
@ -2338,6 +2495,33 @@ static int net_socket_connect_init(VLANState *vlan, const char *host_str)
return 0;
}
static int net_socket_mcast_init(VLANState *vlan, const char *host_str)
{
NetSocketState *s;
int fd;
struct sockaddr_in saddr;
if (parse_host_port(&saddr, host_str) < 0)
return -1;
fd = net_socket_mcast_create(&saddr);
if (fd < 0)
return -1;
s = net_socket_fd_init(vlan, fd, 0);
if (!s)
return -1;
s->dgram_dst = saddr;
snprintf(s->vc->info_str, sizeof(s->vc->info_str),
"socket: mcast=%s:%d",
inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
return 0;
}
#endif /* !_WIN32 */
static int get_param_value(char *buf, int buf_size,
@ -2474,6 +2658,8 @@ int net_client_init(const char *str)
ret = net_socket_listen_init(vlan, buf);
} else if (get_param_value(buf, sizeof(buf), "connect", p) > 0) {
ret = net_socket_connect_init(vlan, buf);
} else if (get_param_value(buf, sizeof(buf), "mcast", p) > 0) {
ret = net_socket_mcast_init(vlan, buf);
} else {
fprintf(stderr, "Unknown socket options: %s\n", p);
return -1;
@ -3812,6 +3998,8 @@ void help(void)
" use 'fd=h' to connect to an already opened TAP interface\n"
"-net socket[,vlan=n][,fd=h][,listen=[host]:port][,connect=host:port]\n"
" connect the vlan 'n' to another VLAN using a socket connection\n"
"-net socket[,vlan=n][,fd=h][,mcast=maddr:port]\n"
" connect the vlan 'n' to multicast maddr and port\n"
#endif
"-net none use it alone to have zero network devices; if no -net option\n"
" is provided, the default is '-net nic -net user'\n"