freebsd-dev/sys/netgraph/ng_socket.c
Robert Watson c6bfdc5d32 Acquire Giant arounds calls into the linker from Netgraph sockets.
We now no longer hold Giant in send(), so it isn't inheritted by the
linker, which calls into VFS.

Reported by:	glebius
Discussed with:	glebius, bz
2004-08-30 14:41:25 +00:00

1144 lines
28 KiB
C

/*
* ng_socket.c
*
* Copyright (c) 1996-1999 Whistle Communications, Inc.
* All rights reserved.
*
* Subject to the following obligations and disclaimer of warranty, use and
* redistribution of this software, in source or object code forms, with or
* without modifications are expressly permitted by Whistle Communications;
* provided, however, that:
* 1. Any and all reproductions of the source or object code must include the
* copyright notice above and the following disclaimer of warranties; and
* 2. No rights are granted, in any manner or form, to use Whistle
* Communications, Inc. trademarks, including the mark "WHISTLE
* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
* such appears in the above copyright notice or in the software.
*
* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* Author: Julian Elischer <julian@freebsd.org>
*
* $FreeBSD$
* $Whistle: ng_socket.c,v 1.28 1999/11/01 09:24:52 julian Exp $
*/
/*
* Netgraph socket nodes
*
* There are two types of netgraph sockets, control and data.
* Control sockets have a netgraph node, but data sockets are
* parasitic on control sockets, and have no node of their own.
*/
#include <sys/param.h>
#include <sys/domain.h>
#include <sys/errno.h>
#include <sys/kdb.h>
#include <sys/kernel.h>
#include <sys/linker.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/mutex.h>
#include <sys/protosw.h>
#include <sys/queue.h>
#include <sys/signalvar.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sx.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#ifdef NOTYET
#include <sys/vnode.h>
#endif
#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include <netgraph/ng_socketvar.h>
#include <netgraph/ng_socket.h>
#ifdef NG_SEPARATE_MALLOC
MALLOC_DEFINE(M_NETGRAPH_PATH, "netgraph_path", "netgraph path info ");
MALLOC_DEFINE(M_NETGRAPH_SOCK, "netgraph_sock", "netgraph socket info ");
#else
#define M_NETGRAPH_PATH M_NETGRAPH
#define M_NETGRAPH_SOCK M_NETGRAPH
#endif
/*
* It's Ascii-art time!
* +-------------+ +-------------+
* |socket (ctl)| |socket (data)|
* +-------------+ +-------------+
* ^ ^
* | |
* v v
* +-----------+ +-----------+
* |pcb (ctl)| |pcb (data)|
* +-----------+ +-----------+
* ^ ^
* | |
* v v
* +--------------------------+
* | Socket type private |
* | data |
* +--------------------------+
* ^
* |
* v
* +----------------+
* | struct ng_node |
* +----------------+
*/
/* Netgraph node methods */
static ng_constructor_t ngs_constructor;
static ng_rcvmsg_t ngs_rcvmsg;
static ng_shutdown_t ngs_shutdown;
static ng_newhook_t ngs_newhook;
static ng_connect_t ngs_connect;
static ng_rcvdata_t ngs_rcvdata;
static ng_disconnect_t ngs_disconnect;
/* Internal methods */
static int ng_attach_data(struct socket *so);
static int ng_attach_cntl(struct socket *so);
static int ng_attach_common(struct socket *so, int type);
static void ng_detach_common(struct ngpcb *pcbp, int type);
/*static int ng_internalize(struct mbuf *m, struct thread *p); */
static int ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp);
static int ng_bind(struct sockaddr *nam, struct ngpcb *pcbp);
static int ngs_mod_event(module_t mod, int event, void *data);
static int ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg,
struct sockaddr_ng *addr);
/* Netgraph type descriptor */
static struct ng_type typestruct = {
.version = NG_ABI_VERSION,
.name = NG_SOCKET_NODE_TYPE,
.mod_event = ngs_mod_event,
.constructor = ngs_constructor,
.rcvmsg = ngs_rcvmsg,
.shutdown = ngs_shutdown,
.newhook = ngs_newhook,
.connect = ngs_connect,
.rcvdata = ngs_rcvdata,
.disconnect = ngs_disconnect,
};
NETGRAPH_INIT(socket, &typestruct);
/* Buffer space */
static u_long ngpdg_sendspace = 20 * 1024; /* really max datagram size */
SYSCTL_INT(_net_graph, OID_AUTO, maxdgram, CTLFLAG_RW,
&ngpdg_sendspace , 0, "Maximum outgoing Netgraph datagram size");
static u_long ngpdg_recvspace = 20 * 1024;
SYSCTL_INT(_net_graph, OID_AUTO, recvspace, CTLFLAG_RW,
&ngpdg_recvspace , 0, "Maximum space for incoming Netgraph datagrams");
/* List of all sockets */
static LIST_HEAD(, ngpcb) ngsocklist;
static struct mtx ngsocketlist_mtx;
MTX_SYSINIT(ngsocketlist, &ngsocketlist_mtx, "ng_socketlist", MTX_DEF);
#define sotongpcb(so) ((struct ngpcb *)(so)->so_pcb)
/* If getting unexplained errors returned, set this to "kdb_enter("X"); */
#ifndef TRAP_ERROR
#define TRAP_ERROR
#endif
/***************************************************************
Control sockets
***************************************************************/
static int
ngc_attach(struct socket *so, int proto, struct thread *td)
{
struct ngpcb *const pcbp = sotongpcb(so);
if (suser(td))
return (EPERM);
if (pcbp != NULL)
return (EISCONN);
return (ng_attach_cntl(so));
}
static int
ngc_detach(struct socket *so)
{
struct ngpcb *const pcbp = sotongpcb(so);
if (pcbp == NULL)
return (EINVAL);
ng_detach_common(pcbp, NG_CONTROL);
return (0);
}
static int
ngc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
struct mbuf *control, struct thread *td)
{
struct ngpcb *const pcbp = sotongpcb(so);
struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
struct ng_mesg *msg;
struct mbuf *m0;
char *path = NULL;
int len, error = 0;
if (pcbp == NULL) {
error = EINVAL;
goto release;
}
#ifdef NOTYET
if (control && (error = ng_internalize(control, td))) {
if (pcbp->sockdata == NULL) {
error = ENOTCONN;
goto release;
}
}
#else /* NOTYET */
if (control) {
error = EINVAL;
goto release;
}
#endif /* NOTYET */
/* Require destination as there may be >= 1 hooks on this node */
if (addr == NULL) {
error = EDESTADDRREQ;
goto release;
}
/* Allocate an expendable buffer for the path, chop off
* the sockaddr header, and make sure it's NUL terminated */
len = sap->sg_len - 2;
MALLOC(path, char *, len + 1, M_NETGRAPH_PATH, M_WAITOK);
if (path == NULL) {
error = ENOMEM;
goto release;
}
bcopy(sap->sg_data, path, len);
path[len] = '\0';
/* Move the actual message out of mbufs into a linear buffer.
* Start by adding up the size of the data. (could use mh_len?) */
for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next)
len += m0->m_len;
/* Move the data into a linear buffer as well. Messages are not
* delivered in mbufs. */
MALLOC(msg, struct ng_mesg *, len + 1, M_NETGRAPH_MSG, M_WAITOK);
if (msg == NULL) {
error = ENOMEM;
goto release;
}
m_copydata(m, 0, len, (char *)msg);
#ifdef TRACE_MESSAGES
do {
item_p item;
if ((item = ng_package_msg(msg)) == NULL) {
(msg) = NULL;
(error) = ENOMEM;
printf("err=%d\n",error);
break;
}
if (((error) = ng_address_path((pcbp->sockdata->node), (item),
(path), (NULL))) == 0) {
printf("[%x]:<---------[socket]: c=<%d>cmd=%x(%s) f=%x #%d (%s)\n",
item->el_dest->nd_ID,
msg->header.typecookie,
msg->header.cmd,
msg->header.cmdstr,
msg->header.flags,
msg->header.token,
item->el_dest->nd_type->name);
SAVE_LINE(item);
(error) = ng_snd_item((item), 0);
}
else {
printf("errx=%d\n",error);
}
(msg) = NULL;
} while (0);
#else
/*
* Hack alert!
* We look into the message and if it mkpeers a node of unknown type, we
* try to load it. We need to do this now, in syscall thread, because if
* message gets queued and applied later we will get panic.
*/
if (msg->header.typecookie == NGM_GENERIC_COOKIE &&
msg->header.cmd == NGM_MKPEER) {
struct ngm_mkpeer *const mkp = (struct ngm_mkpeer *) msg->data;
struct ng_type *type;
if ((type = ng_findtype(mkp->type)) == NULL) {
char filename[NG_TYPESIZ + 3];
linker_file_t lf;
int error;
/* Not found, try to load it as a loadable module */
snprintf(filename, sizeof(filename), "ng_%s", mkp->type);
mtx_lock(&Giant);
error = linker_load_module(NULL, filename, NULL, NULL, &lf);
mtx_unlock(&Giant);
if (error != 0) {
FREE(msg, M_NETGRAPH_MSG);
goto release;
}
lf->userrefs++;
/* Try again, as now the type should have linked itself in */
if ((type = ng_findtype(mkp->type)) == NULL) {
FREE(msg, M_NETGRAPH_MSG);
error = ENXIO;
goto release;
}
}
}
/* The callee will free the msg when done. The path is our business. */
NG_SEND_MSG_PATH(error, pcbp->sockdata->node, msg, path, 0);
#endif
release:
if (path != NULL)
FREE(path, M_NETGRAPH_PATH);
if (control != NULL)
m_freem(control);
if (m != NULL)
m_freem(m);
return (error);
}
static int
ngc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
{
struct ngpcb *const pcbp = sotongpcb(so);
if (pcbp == 0)
return (EINVAL);
return (ng_bind(nam, pcbp));
}
static int
ngc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
{
printf(" program tried to connect control socket to remote node\n ");
/*
* At this time refuse to do this.. it used to
* do something but it was undocumented and not used.
*/
return (EINVAL);
}
/***************************************************************
Data sockets
***************************************************************/
static int
ngd_attach(struct socket *so, int proto, struct thread *td)
{
struct ngpcb *const pcbp = sotongpcb(so);
if (pcbp != NULL)
return (EISCONN);
return (ng_attach_data(so));
}
static int
ngd_detach(struct socket *so)
{
struct ngpcb *const pcbp = sotongpcb(so);
if (pcbp == NULL)
return (EINVAL);
ng_detach_common(pcbp, NG_DATA);
return (0);
}
static int
ngd_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
struct mbuf *control, struct thread *td)
{
struct ngpcb *const pcbp = sotongpcb(so);
struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
int len, error;
hook_p hook = NULL;
char hookname[NG_HOOKSIZ];
if ((pcbp == NULL) || (control != NULL)) {
error = EINVAL;
goto release;
}
if (pcbp->sockdata == NULL) {
error = ENOTCONN;
goto release;
}
/*
* If the user used any of these ways to not specify an address
* then handle specially.
*/
if ((sap == NULL)
|| ((len = sap->sg_len - 2) <= 0)
|| (*sap->sg_data == '\0')) {
if (NG_NODE_NUMHOOKS(pcbp->sockdata->node) != 1) {
error = EDESTADDRREQ;
goto release;
}
/*
* if exactly one hook exists, just use it.
* Special case to allow write(2) to work on an ng_socket.
*/
hook = LIST_FIRST(&pcbp->sockdata->node->nd_hooks);
} else {
if (len >= NG_HOOKSIZ) {
error = EINVAL;
goto release;
}
/*
* chop off the sockaddr header, and make sure it's NUL
* terminated
*/
bcopy(sap->sg_data, hookname, len);
hookname[len] = '\0';
/* Find the correct hook from 'hookname' */
LIST_FOREACH(hook, &pcbp->sockdata->node->nd_hooks, hk_hooks) {
if (strcmp(hookname, NG_HOOK_NAME(hook)) == 0) {
break;
}
}
if (hook == NULL) {
error = EHOSTUNREACH;
}
}
/* Send data (OK if hook is NULL) */
NG_SEND_DATA_ONLY(error, hook, m); /* makes m NULL */
release:
if (control != NULL)
m_freem(control);
if (m != NULL)
m_freem(m);
return (error);
}
static int
ngd_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
{
struct ngpcb *const pcbp = sotongpcb(so);
if (pcbp == 0)
return (EINVAL);
return (ng_connect_data(nam, pcbp));
}
/*
* Used for both data and control sockets
*/
static int
ng_setsockaddr(struct socket *so, struct sockaddr **addr)
{
struct ngpcb *pcbp;
struct sockaddr_ng *sg;
int sg_len, namelen, s;
/* Why isn't sg_data a `char[1]' ? :-( */
sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1;
s = splnet();
pcbp = sotongpcb(so);
if ((pcbp == NULL) || (pcbp->sockdata == NULL)) {
splx(s);
return (EINVAL);
}
namelen = 0; /* silence compiler ! */
if ( NG_NODE_HAS_NAME(pcbp->sockdata->node))
sg_len += namelen = strlen(NG_NODE_NAME(pcbp->sockdata->node));
MALLOC(sg, struct sockaddr_ng *, sg_len, M_SONAME, M_WAITOK | M_ZERO);
if (NG_NODE_HAS_NAME(pcbp->sockdata->node))
bcopy(NG_NODE_NAME(pcbp->sockdata->node), sg->sg_data, namelen);
splx(s);
sg->sg_len = sg_len;
sg->sg_family = AF_NETGRAPH;
*addr = (struct sockaddr *)sg;
return (0);
}
/*
* Attach a socket to it's protocol specific partner.
* For a control socket, actually create a netgraph node and attach
* to it as well.
*/
static int
ng_attach_cntl(struct socket *so)
{
struct ngsock *privdata;
struct ngpcb *pcbp;
int error;
/* Setup protocol control block */
if ((error = ng_attach_common(so, NG_CONTROL)) != 0)
return (error);
pcbp = sotongpcb(so);
/* Allocate node private info */
MALLOC(privdata, struct ngsock *,
sizeof(*privdata), M_NETGRAPH_SOCK, M_WAITOK | M_ZERO);
if (privdata == NULL) {
ng_detach_common(pcbp, NG_CONTROL);
return (ENOMEM);
}
/* Make the generic node components */
if ((error = ng_make_node_common(&typestruct, &privdata->node)) != 0) {
FREE(privdata, M_NETGRAPH_SOCK);
ng_detach_common(pcbp, NG_CONTROL);
return (error);
}
NG_NODE_SET_PRIVATE(privdata->node, privdata);
/* Link the pcb and the node private data */
privdata->ctlsock = pcbp;
pcbp->sockdata = privdata;
privdata->refs++;
return (0);
}
static int
ng_attach_data(struct socket *so)
{
return(ng_attach_common(so, NG_DATA));
}
/*
* Set up a socket protocol control block.
* This code is shared between control and data sockets.
*/
static int
ng_attach_common(struct socket *so, int type)
{
struct ngpcb *pcbp;
int error;
/* Standard socket setup stuff */
error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace);
if (error)
return (error);
/* Allocate the pcb */
MALLOC(pcbp, struct ngpcb *, sizeof(*pcbp), M_PCB, M_WAITOK | M_ZERO);
if (pcbp == NULL)
return (ENOMEM);
pcbp->type = type;
/* Link the pcb and the socket */
so->so_pcb = (caddr_t) pcbp;
pcbp->ng_socket = so;
/* Add the socket to linked list */
mtx_lock(&ngsocketlist_mtx);
LIST_INSERT_HEAD(&ngsocklist, pcbp, socks);
mtx_unlock(&ngsocketlist_mtx);
return (0);
}
/*
* Disassociate the socket from it's protocol specific
* partner. If it's attached to a node's private data structure,
* then unlink from that too. If we were the last socket attached to it,
* then shut down the entire node. Shared code for control and data sockets.
*/
static void
ng_detach_common(struct ngpcb *pcbp, int which)
{
struct ngsock *priv;
if (pcbp->sockdata) {
priv = pcbp->sockdata;
pcbp->sockdata = NULL;
switch (which) {
case NG_CONTROL:
priv->ctlsock = NULL;
break;
case NG_DATA:
priv->datasock = NULL;
break;
default:
panic(__func__);
}
if ((--priv->refs == 0) && (priv->node != NULL))
ng_rmnode_self(priv->node);
}
pcbp->ng_socket->so_pcb = NULL;
pcbp->ng_socket = NULL;
mtx_lock(&ngsocketlist_mtx);
LIST_REMOVE(pcbp, socks);
mtx_unlock(&ngsocketlist_mtx);
FREE(pcbp, M_PCB);
}
#ifdef NOTYET
/*
* File descriptors can be passed into an AF_NETGRAPH socket.
* Note, that file descriptors cannot be passed OUT.
* Only character device descriptors are accepted.
* Character devices are useful to connect a graph to a device,
* which after all is the purpose of this whole system.
*/
static int
ng_internalize(struct mbuf *control, struct thread *td)
{
const struct cmsghdr *cm = mtod(control, const struct cmsghdr *);
struct file *fp;
struct vnode *vn;
int oldfds;
int fd;
if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET ||
cm->cmsg_len != control->m_len) {
TRAP_ERROR;
return (EINVAL);
}
/* Check there is only one FD. XXX what would more than one signify? */
oldfds = ((caddr_t)cm + cm->cmsg_len - (caddr_t)data) / sizeof (int);
if (oldfds != 1) {
TRAP_ERROR;
return (EINVAL);
}
/* Check that the FD given is legit. and change it to a pointer to a
* struct file. */
fd = CMSG_DATA(cm);
if ((error = fget(td, fd, &fp)) != 0)
return (error);
/* Depending on what kind of resource it is, act differently. For
* devices, we treat it as a file. For an AF_NETGRAPH socket,
* shortcut straight to the node. */
switch (fp->f_type) {
case DTYPE_VNODE:
vn = fp->f_data;
if (vn && (vn->v_type == VCHR)) {
/* for a VCHR, actually reference the FILE */
fp->f_count++;
/* XXX then what :) */
/* how to pass on to other modules? */
} else {
fdrop(fp, td);
TRAP_ERROR;
return (EINVAL);
}
break;
default:
fdrop(fp, td);
TRAP_ERROR;
return (EINVAL);
}
fdrop(fp, td);
return (0);
}
#endif /* NOTYET */
/*
* Connect the data socket to a named control socket node.
*/
static int
ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp)
{
struct sockaddr_ng *sap;
node_p farnode;
struct ngsock *priv;
int error;
item_p item;
/* If we are already connected, don't do it again */
if (pcbp->sockdata != NULL)
return (EISCONN);
/* Find the target (victim) and check it doesn't already have a data
* socket. Also check it is a 'socket' type node.
* Use ng_package_data() and address_path() to do this.
*/
sap = (struct sockaddr_ng *) nam;
/* The item will hold the node reference */
item = ng_package_data(NULL, NULL);
if (item == NULL) {
return (ENOMEM);
}
if ((error = ng_address_path(NULL, item, sap->sg_data, 0)))
return (error); /* item is freed on failure */
/*
* Extract node from item and free item. Remember we now have
* a reference on the node. The item holds it for us.
* when we free the item we release the reference.
*/
farnode = item->el_dest; /* shortcut */
if (strcmp(farnode->nd_type->name, NG_SOCKET_NODE_TYPE) != 0) {
NG_FREE_ITEM(item); /* drop the reference to the node */
return (EINVAL);
}
priv = NG_NODE_PRIVATE(farnode);
if (priv->datasock != NULL) {
NG_FREE_ITEM(item); /* drop the reference to the node */
return (EADDRINUSE);
}
/*
* Link the PCB and the private data struct. and note the extra
* reference. Drop the extra reference on the node.
*/
priv->datasock = pcbp;
pcbp->sockdata = priv;
priv->refs++; /* XXX possible race if it's being freed */
NG_FREE_ITEM(item); /* drop the reference to the node */
return (0);
}
/*
* Binding a socket means giving the corresponding node a name
*/
static int
ng_bind(struct sockaddr *nam, struct ngpcb *pcbp)
{
struct ngsock *const priv = pcbp->sockdata;
struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam;
if (priv == NULL) {
TRAP_ERROR;
return (EINVAL);
}
if ((sap->sg_len < 4)
|| (sap->sg_len > (NG_NODESIZ + 2))
|| (sap->sg_data[0] == '\0')
|| (sap->sg_data[sap->sg_len - 3] != '\0')) {
TRAP_ERROR;
return (EINVAL);
}
return (ng_name_node(priv->node, sap->sg_data));
}
/*
* Take a message and pass it up to the control socket associated
* with the node.
*/
static int
ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, struct sockaddr_ng *addr)
{
struct socket *const so = pcbp->ng_socket;
struct mbuf *mdata;
int msglen;
/* Copy the message itself into an mbuf chain */
msglen = sizeof(struct ng_mesg) + msg->header.arglen;
mdata = m_devget((caddr_t) msg, msglen, 0, NULL, NULL);
/* Here we free the message, as we are the end of the line.
* We need to do that regardless of whether we got mbufs. */
NG_FREE_MSG(msg);
if (mdata == NULL) {
TRAP_ERROR;
return (ENOBUFS);
}
/* Send it up to the socket */
if (sbappendaddr(&so->so_rcv,
(struct sockaddr *) addr, mdata, NULL) == 0) {
TRAP_ERROR;
m_freem(mdata);
return (ENOBUFS);
}
sorwakeup(so);
return (0);
}
/*
* You can only create new nodes from the socket end of things.
*/
static int
ngs_constructor(node_p nodep)
{
return (EINVAL);
}
/*
* We allow any hook to be connected to the node.
* There is no per-hook private information though.
*/
static int
ngs_newhook(node_p node, hook_p hook, const char *name)
{
NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node));
return (0);
}
/*
* if only one hook, allow read(2) and write(2) to work.
*/
static int
ngs_connect(hook_p hook)
{
node_p node = NG_HOOK_NODE(hook);
struct ngsock *priv = NG_NODE_PRIVATE(node);
if ((priv->datasock)
&& (priv->datasock->ng_socket)) {
if (NG_NODE_NUMHOOKS(node) == 1) {
priv->datasock->ng_socket->so_state |= SS_ISCONNECTED;
} else {
priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED;
}
}
return (0);
}
/*
* Incoming messages get passed up to the control socket.
* Unless they are for us specifically (socket_type)
*/
static int
ngs_rcvmsg(node_p node, item_p item, hook_p lasthook)
{
struct ngsock *const priv = NG_NODE_PRIVATE(node);
struct ngpcb *const pcbp = priv->ctlsock;
struct sockaddr_ng *addr;
int addrlen;
int error = 0;
struct ng_mesg *msg;
ng_ID_t retaddr = NGI_RETADDR(item);
char retabuf[32];
NGI_GET_MSG(item, msg);
NG_FREE_ITEM(item); /* we have all we need */
/* Only allow mesgs to be passed if we have the control socket.
* Data sockets can only support the generic messages. */
if (pcbp == NULL) {
TRAP_ERROR;
return (EINVAL);
}
#ifdef TRACE_MESSAGES
printf("[%x]:---------->[socket]: c=<%d>cmd=%x(%s) f=%x #%d\n",
retaddr,
msg->header.typecookie,
msg->header.cmd,
msg->header.cmdstr,
msg->header.flags,
msg->header.token);
#endif
if (msg->header.typecookie == NGM_SOCKET_COOKIE) {
switch (msg->header.cmd) {
case NGM_SOCK_CMD_NOLINGER:
priv->flags |= NGS_FLAG_NOLINGER;
break;
case NGM_SOCK_CMD_LINGER:
priv->flags &= ~NGS_FLAG_NOLINGER;
break;
default:
error = EINVAL; /* unknown command */
}
/* Free the message and return */
NG_FREE_MSG(msg);
return(error);
}
/* Get the return address into a sockaddr */
sprintf(retabuf,"[%x]:", retaddr);
addrlen = strlen(retabuf);
MALLOC(addr, struct sockaddr_ng *, addrlen + 4, M_NETGRAPH_PATH, M_NOWAIT);
if (addr == NULL) {
TRAP_ERROR;
return (ENOMEM);
}
addr->sg_len = addrlen + 3;
addr->sg_family = AF_NETGRAPH;
bcopy(retabuf, addr->sg_data, addrlen);
addr->sg_data[addrlen] = '\0';
/* Send it up */
error = ship_msg(pcbp, msg, addr);
FREE(addr, M_NETGRAPH_PATH);
return (error);
}
/*
* Receive data on a hook
*/
static int
ngs_rcvdata(hook_p hook, item_p item)
{
struct ngsock *const priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
struct ngpcb *const pcbp = priv->datasock;
struct socket *so;
struct sockaddr_ng *addr;
char *addrbuf[NG_HOOKSIZ + 4];
int addrlen;
struct mbuf *m;
NGI_GET_M(item, m);
NG_FREE_ITEM(item);
/* If there is no data socket, black-hole it */
if (pcbp == NULL) {
NG_FREE_M(m);
return (0);
}
so = pcbp->ng_socket;
/* Get the return address into a sockaddr. */
addrlen = strlen(NG_HOOK_NAME(hook)); /* <= NG_HOOKSIZ - 1 */
addr = (struct sockaddr_ng *) addrbuf;
addr->sg_len = addrlen + 3;
addr->sg_family = AF_NETGRAPH;
bcopy(NG_HOOK_NAME(hook), addr->sg_data, addrlen);
addr->sg_data[addrlen] = '\0';
/* Try to tell the socket which hook it came in on */
if (sbappendaddr(&so->so_rcv, (struct sockaddr *) addr, m, NULL) == 0) {
m_freem(m);
TRAP_ERROR;
return (ENOBUFS);
}
sorwakeup(so);
return (0);
}
/*
* Hook disconnection
*
* For this type, removal of the last link destroys the node
* if the NOLINGER flag is set.
*/
static int
ngs_disconnect(hook_p hook)
{
node_p node = NG_HOOK_NODE(hook);
struct ngsock *const priv = NG_NODE_PRIVATE(node);
if ((priv->datasock)
&& (priv->datasock->ng_socket)) {
if (NG_NODE_NUMHOOKS(node) == 1) {
priv->datasock->ng_socket->so_state |= SS_ISCONNECTED;
} else {
priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED;
}
}
if ((priv->flags & NGS_FLAG_NOLINGER )
&& (NG_NODE_NUMHOOKS(node) == 0)
&& (NG_NODE_IS_VALID(node))) {
ng_rmnode_self(node);
}
return (0);
}
/*
* Do local shutdown processing.
* In this case, that involves making sure the socket
* knows we should be shutting down.
*/
static int
ngs_shutdown(node_p node)
{
struct ngsock *const priv = NG_NODE_PRIVATE(node);
struct ngpcb *const dpcbp = priv->datasock;
struct ngpcb *const pcbp = priv->ctlsock;
if (dpcbp != NULL) {
soisdisconnected(dpcbp->ng_socket);
dpcbp->sockdata = NULL;
priv->datasock = NULL;
priv->refs--;
}
if (pcbp != NULL) {
soisdisconnected(pcbp->ng_socket);
pcbp->sockdata = NULL;
priv->ctlsock = NULL;
priv->refs--;
}
NG_NODE_SET_PRIVATE(node, NULL);
NG_NODE_UNREF(node);
FREE(priv, M_NETGRAPH_SOCK);
return (0);
}
static int
dummy_disconnect(struct socket *so)
{
return (0);
}
/*
* Control and data socket type descriptors
*/
static struct pr_usrreqs ngc_usrreqs = {
NULL, /* abort */
pru_accept_notsupp,
ngc_attach,
ngc_bind,
ngc_connect,
pru_connect2_notsupp,
pru_control_notsupp,
ngc_detach,
dummy_disconnect, /* disconnect */
pru_listen_notsupp,
NULL, /* setpeeraddr */
pru_rcvd_notsupp,
pru_rcvoob_notsupp,
ngc_send,
pru_sense_null,
NULL, /* shutdown */
ng_setsockaddr,
sosend,
soreceive,
sopoll,
pru_sosetlabel_null
};
static struct pr_usrreqs ngd_usrreqs = {
NULL, /* abort */
pru_accept_notsupp,
ngd_attach,
NULL, /* bind */
ngd_connect,
pru_connect2_notsupp,
pru_control_notsupp,
ngd_detach,
dummy_disconnect, /* disconnect */
pru_listen_notsupp,
NULL, /* setpeeraddr */
pru_rcvd_notsupp,
pru_rcvoob_notsupp,
ngd_send,
pru_sense_null,
NULL, /* shutdown */
ng_setsockaddr,
sosend,
soreceive,
sopoll,
pru_sosetlabel_null
};
/*
* Definitions of protocols supported in the NETGRAPH domain.
*/
extern struct domain ngdomain; /* stop compiler warnings */
static struct protosw ngsw[] = {
{
SOCK_DGRAM, /* protocol type */
&ngdomain, /* backpointer to domain */
NG_CONTROL,
PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */, /* flags */
0, 0, 0, 0, /* input, output, ctlinput, ctloutput */
NULL, /* ousrreq */
0, 0, 0, 0, /* init, fasttimeo, slowtimo, drain */
&ngc_usrreqs, /* usrreq table (above) */
/*{NULL}*/ /* pffh (protocol filter head?) */
},
{
SOCK_DGRAM, /* protocol type */
&ngdomain, /* backpointer to domain */
NG_DATA,
PR_ATOMIC | PR_ADDR, /* flags */
0, 0, 0, 0, /* input, output, ctlinput, ctloutput */
NULL, /* ousrreq() */
0, 0, 0, 0, /* init, fasttimeo, slowtimo, drain */
&ngd_usrreqs, /* usrreq table (above) */
/*{NULL}*/ /* pffh (protocol filter head?) */
}
};
struct domain ngdomain = {
AF_NETGRAPH,
"netgraph",
NULL, /* init() */
NULL, /* externalise() */
NULL, /* dispose() */
ngsw, /* protosw entry */
&ngsw[sizeof(ngsw) / sizeof(ngsw[0])], /* Number of protosw entries */
NULL, /* next domain in list */
NULL, /* rtattach() */
0, /* arg to rtattach in bits */
0 /* maxrtkey */
};
/*
* Handle loading and unloading for this node type
* This is to handle auxiliary linkages (e.g protocol domain addition).
*/
static int
ngs_mod_event(module_t mod, int event, void *data)
{
int error = 0;
switch (event) {
case MOD_LOAD:
/* Register protocol domain */
net_add_domain(&ngdomain);
break;
case MOD_UNLOAD:
/* Insure there are no open netgraph sockets */
if (!LIST_EMPTY(&ngsocklist)) {
error = EBUSY;
break;
}
#ifdef NOTYET
if ((LIST_EMPTY(&ngsocklist)) && (typestruct.refs == 0)) {
/* Unregister protocol domain XXX can't do this yet.. */
if ((error = net_rm_domain(&ngdomain)) != 0)
break;
} else
#endif
error = EBUSY;
break;
default:
error = EOPNOTSUPP;
break;
}
return (error);
}
SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, "");
SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA");
SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, "");
SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL");
SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, "");