FreeBSD-5.3/sys/netgraph/ng_socket.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: src/sys/netgraph/ng_socket.c,v 1.53.2.1 2004/09/02 15:41:44 rwatson Exp $
* $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, "");