/* Open a NETLINK socket. */
int
__netlink_open (struct netlink_handle *h)
{
struct sockaddr_nl nladdr;
h->fd = __socket (PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
if (h->fd < 0)
goto out;
memset (&nladdr, '\0', sizeof (nladdr));
nladdr.nl_family = AF_NETLINK;
if (__bind (h->fd, (struct sockaddr *) &nladdr, sizeof (nladdr)) < 0)
{
close_and_out:
__netlink_close (h);
out:
#if __ASSUME_NETLINK_SUPPORT == 0
__no_netlink_support = 1;
#endif
return -1;
}
/* Determine the ID the kernel assigned for this netlink connection.
It is not necessarily the PID if there is more than one socket
open. */
socklen_t addr_len = sizeof (nladdr);
if (__getsockname (h->fd, (struct sockaddr *) &nladdr, &addr_len) < 0)
goto close_and_out;
h->pid = nladdr.nl_pid;
return 0;
}
/*
* Create a socket that is locally bound to a non-reserve port. For
* any failures, -1 is returned which will cause the RPC code to
* create the socket.
*/
int
internal_function
__get_socket (struct sockaddr_in *saddr)
{
int so = __socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (so < 0)
return -1;
struct sockaddr_in laddr;
socklen_t namelen = sizeof (laddr);
laddr.sin_family = AF_INET;
laddr.sin_port = 0;
laddr.sin_addr.s_addr = htonl (INADDR_ANY);
int cc = __bind (so, (struct sockaddr *) &laddr, namelen);
if (__glibc_unlikely (cc < 0))
{
fail:
__close (so);
return -1;
}
cc = __connect (so, (struct sockaddr *) saddr, namelen);
if (__glibc_unlikely (cc < 0))
goto fail;
return so;
}
/*
* Bind a socket to a privileged IP port
*/
int
bindresvport (int sd, struct sockaddr_in *sin)
{
static short port;
struct sockaddr_in myaddr;
int i;
#define STARTPORT 600
#define LOWPORT 512
#define ENDPORT (IPPORT_RESERVED - 1)
#define NPORTS (ENDPORT - STARTPORT + 1)
static short startport = STARTPORT;
if (sin == (struct sockaddr_in *) 0)
{
sin = &myaddr;
__bzero (sin, sizeof (*sin));
sin->sin_family = AF_INET;
}
else if (sin->sin_family != AF_INET)
{
__set_errno (EAFNOSUPPORT);
return -1;
}
if (port == 0)
{
port = (__getpid () % NPORTS) + STARTPORT;
}
/* Initialize to make gcc happy. */
int res = -1;
int nports = ENDPORT - startport + 1;
int endport = ENDPORT;
again:
for (i = 0; i < nports; ++i)
{
sin->sin_port = htons (port++);
if (port > endport)
port = startport;
res = __bind (sd, (const struct sockaddr *)sin, sizeof (struct sockaddr_in));
if (res >= 0 || errno != EADDRINUSE)
break;
}
if (i == nports && startport != LOWPORT)
{
startport = LOWPORT;
endport = STARTPORT - 1;
nports = STARTPORT - LOWPORT;
port = LOWPORT + port % (STARTPORT - LOWPORT);
goto again;
}
return res;
}
/*
* bind stub, legacy version
*/
int
bind(int s, const struct sockaddr *name, socklen_t namelen)
{
int ret = __bind(s, name, namelen);
/* use ENOTSUP for legacy behavior */
if (ret < 0 && errno == EOPNOTSUPP)
errno = ENOTSUP;
return ret;
}
/*
* Usage:
* xprt = svcunix_create(sock, send_buf_size, recv_buf_size);
*
* Creates, registers, and returns a (rpc) unix based transporter.
* Once *xprt is initialized, it is registered as a transporter
* see (svc.h, xprt_register). This routine returns
* a NULL if a problem occurred.
*
* If sock<0 then a socket is created, else sock is used.
* If the socket, sock is not bound to a port then svcunix_create
* binds it to an arbitrary port. The routine then starts a unix
* listener on the socket's associated port. In any (successful) case,
* xprt->xp_sock is the registered socket number and xprt->xp_port is the
* associated port number.
*
* Since unix streams do buffered io similar to stdio, the caller can specify
* how big the send and receive buffers are via the second and third parms;
* 0 => use the system default.
*/
SVCXPRT *
svcunix_create (int sock, u_int sendsize, u_int recvsize, char *path)
{
bool_t madesock = FALSE;
SVCXPRT *xprt;
struct unix_rendezvous *r;
struct sockaddr_un addr;
socklen_t len = sizeof (struct sockaddr_in);
if (sock == RPC_ANYSOCK)
{
if ((sock = __socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
{
perror (_("svc_unix.c - AF_UNIX socket creation problem"));
return (SVCXPRT *) NULL;
}
madesock = TRUE;
}
memset (&addr, '\0', sizeof (addr));
addr.sun_family = AF_UNIX;
len = strlen (path) + 1;
memcpy (addr.sun_path, path, len);
len += sizeof (addr.sun_family);
__bind (sock, (struct sockaddr *) &addr, len);
if (__getsockname (sock, (struct sockaddr *) &addr, &len) != 0
|| __listen (sock, SOMAXCONN) != 0)
{
perror (_("svc_unix.c - cannot getsockname or listen"));
if (madesock)
__close (sock);
return (SVCXPRT *) NULL;
}
r = (struct unix_rendezvous *) mem_alloc (sizeof (*r));
xprt = (SVCXPRT *) mem_alloc (sizeof (SVCXPRT));
if (r == NULL || xprt == NULL)
{
__fxprintf (NULL, "%s: %s", __func__, _("out of memory\n"));
mem_free (r, sizeof (*r));
mem_free (xprt, sizeof (SVCXPRT));
return NULL;
}
r->sendsize = sendsize;
r->recvsize = recvsize;
xprt->xp_p2 = NULL;
xprt->xp_p1 = (caddr_t) r;
xprt->xp_verf = _null_auth;
xprt->xp_ops = &svcunix_rendezvous_op;
xprt->xp_port = -1;
xprt->xp_sock = sock;
xprt_register (xprt);
return xprt;
}
/*
* Usage:
* xprt = svctcp_create(sock, send_buf_size, recv_buf_size);
*
* Creates, registers, and returns a (rpc) tcp based transporter.
* Once *xprt is initialized, it is registered as a transporter
* see (svc.h, xprt_register). This routine returns
* a NULL if a problem occurred.
*
* If sock<0 then a socket is created, else sock is used.
* If the socket, sock is not bound to a port then svctcp_create
* binds it to an arbitrary port. The routine then starts a tcp
* listener on the socket's associated port. In any (successful) case,
* xprt->xp_sock is the registered socket number and xprt->xp_port is the
* associated port number.
*
* Since tcp streams do buffered io similar to stdio, the caller can specify
* how big the send and receive buffers are via the second and third parms;
* 0 => use the system default.
*/
SVCXPRT *
svctcp_create (int sock, u_int sendsize, u_int recvsize)
{
bool_t madesock = FALSE;
SVCXPRT *xprt;
struct tcp_rendezvous *r;
struct sockaddr_in addr;
socklen_t len = sizeof (struct sockaddr_in);
if (sock == RPC_ANYSOCK)
{
if ((sock = __socket (AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
{
perror (_("svc_tcp.c - tcp socket creation problem"));
return (SVCXPRT *) NULL;
}
madesock = TRUE;
}
__bzero ((char *) &addr, sizeof (addr));
addr.sin_family = AF_INET;
if (bindresvport (sock, &addr))
{
addr.sin_port = 0;
(void) __bind (sock, (struct sockaddr *) &addr, len);
}
if ((__getsockname (sock, (struct sockaddr *) &addr, &len) != 0) ||
(__listen (sock, SOMAXCONN) != 0))
{
perror (_("svc_tcp.c - cannot getsockname or listen"));
if (madesock)
(void) __close (sock);
return (SVCXPRT *) NULL;
}
r = (struct tcp_rendezvous *) mem_alloc (sizeof (*r));
xprt = (SVCXPRT *) mem_alloc (sizeof (SVCXPRT));
if (r == NULL || xprt == NULL)
{
(void) __fxprintf (NULL, "%s: %s", __func__, _("out of memory\n"));
mem_free (r, sizeof (*r));
mem_free (xprt, sizeof (SVCXPRT));
return NULL;
}
r->sendsize = sendsize;
r->recvsize = recvsize;
xprt->xp_p2 = NULL;
xprt->xp_p1 = (caddr_t) r;
xprt->xp_verf = _null_auth;
xprt->xp_ops = &svctcp_rendezvous_op;
xprt->xp_port = ntohs (addr.sin_port);
xprt->xp_sock = sock;
xprt_register (xprt);
return xprt;
}
/*
* Swap in a new table (destroying old one).
*/
int dm_swap_table(struct mapped_device *md, struct dm_table *table)
{
int r = -EINVAL;
down(&md->suspend_lock);
/* device must be suspended */
if (!dm_suspended(md))
goto out;
__unbind(md);
r = __bind(md, table);
out:
up(&md->suspend_lock);
return r;
}
/*
* Swap in a new table (destroying old one).
*/
int dm_swap_table(struct mapped_device *md, struct dm_table *table)
{
int r;
down_write(&md->lock);
/* device must be suspended */
if (!test_bit(DMF_SUSPENDED, &md->flags)) {
up_write(&md->lock);
return -EPERM;
}
__unbind(md);
r = __bind(md, table);
if (r)
return r;
up_write(&md->lock);
return 0;
}
/*
* Swap in a new table (destroying old one).
*/
int dm_swap_table(struct mapped_device *md, struct dm_table *table)
{
int r = -EINVAL;
down(&md->suspend_lock);
/* device must be suspended */
if (!dm_suspended(md))
goto out;
/* without bdev, the device size cannot be changed */
if (!md->suspended_bdev)
if (get_capacity(md->disk) != dm_table_get_size(table))
goto out;
__unbind(md);
r = __bind(md, table);
out:
up(&md->suspend_lock);
return r;
}
