freebsd-dev/sys/netgraph/ng_socket.c
Alexander Motin e088dd4c44 Implement new apply callback mechanism to handle item forwarding.
When item forwarded refence counter is incremented, when item
processed, counter decremented. When counter reaches zero,
apply handler is getting called.
Now it allows to report right connect() call status from user-level
at the right time.
2007-10-19 15:04:17 +00:00

1141 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/kernel.h>
#include <sys/linker.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/mutex.h>
#include <sys/priv.h>
#include <sys/protosw.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/syscallsubr.h>
#include <sys/sysctl.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 void ng_socket_free_priv(struct ngsock *priv);
#ifdef NOTYET
static int ng_internalize(struct mbuf *m, struct thread *p);
#endif
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 void ng_socket_item_applied(void *context, int error);
/* 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_ORDERED(socket, &typestruct, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);
/* 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");
#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);
int error;
error = priv_check(td, PRIV_NETGRAPH_CONTROL);
if (error)
return (error);
if (pcbp != NULL)
return (EISCONN);
return (ng_attach_cntl(so));
}
static void
ngc_detach(struct socket *so)
{
struct ngpcb *const pcbp = sotongpcb(so);
KASSERT(pcbp != NULL, ("ngc_detach: pcbp == NULL"));
ng_detach_common(pcbp, NG_CONTROL);
}
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 ngsock *const priv = NG_NODE_PRIVATE(pcbp->sockdata->node);
struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
struct ng_mesg *msg;
struct mbuf *m0;
item_p item;
char *path = NULL;
int len, error = 0;
struct ng_apply_info apply;
#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;
path = malloc(len + 1, M_NETGRAPH_PATH, M_WAITOK);
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.
*/
msg = malloc(len + 1, M_NETGRAPH_MSG, M_WAITOK);
m_copydata(m, 0, len, (char *)msg);
if (msg->header.version != NG_VERSION) {
free(msg, M_NETGRAPH_MSG);
error = EINVAL;
goto release;
}
/*
* 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];
int fileid;
/* Not found, try to load it as a loadable module. */
snprintf(filename, sizeof(filename), "ng_%s",
mkp->type);
error = kern_kldload(curthread, filename, &fileid);
if (error != 0) {
free(msg, M_NETGRAPH_MSG);
goto release;
}
/* See if type has been loaded successfully. */
if ((type = ng_findtype(mkp->type)) == NULL) {
free(msg, M_NETGRAPH_MSG);
(void)kern_kldunload(curthread, fileid,
LINKER_UNLOAD_NORMAL);
error = ENXIO;
goto release;
}
}
}
item = ng_package_msg(msg, M_WAITOK);
if ((error = ng_address_path((pcbp->sockdata->node), item, path, 0))
!= 0) {
#ifdef TRACE_MESSAGES
printf("ng_address_path: errx=%d\n", error);
#endif
goto release;
}
#ifdef TRACE_MESSAGES
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);
#endif
SAVE_LINE(item);
/*
* We do not want to return from syscall until the item
* is processed by destination node. We register callback
* on the item, which will update priv->error when item
* was applied.
* If ng_snd_item() has queued item, we sleep until
* callback wakes us up.
*/
bzero(&apply, sizeof(apply));
apply.apply = ng_socket_item_applied;
apply.context = priv;
item->apply = &apply;
priv->error = -1;
error = ng_snd_item(item, 0);
mtx_lock(&priv->mtx);
if (priv->error == -1)
msleep(priv, &priv->mtx, 0, "ngsock", 0);
mtx_unlock(&priv->mtx);
KASSERT(priv->error != -1,
("ng_socket: priv->error wasn't updated"));
error = priv->error;
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)
{
/*
* At this time refuse to do this.. it used to
* do something but it was undocumented and not used.
*/
printf("program tried to connect control socket to remote node\n");
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 void
ngd_detach(struct socket *so)
{
struct ngpcb *const pcbp = sotongpcb(so);
KASSERT(pcbp != NULL, ("ngd_detach: pcbp == NULL"));
ng_detach_common(pcbp, NG_DATA);
}
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 (sap == NULL)
len = 0; /* Make compiler happy. */
else
len = sap->sg_len - 2;
/*
* If the user used any of these ways to not specify an address
* then handle specially.
*/
if ((sap == NULL) || (len <= 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' */
hook = ng_findhook(pcbp->sockdata->node, hookname);
if (hook == NULL) {
error = EHOSTUNREACH;
goto release;
}
}
/* Send data. */
NG_SEND_DATA_FLAGS(error, hook, m, NG_WAITOK);
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_getsockaddr(struct socket *so, struct sockaddr **addr)
{
struct ngpcb *pcbp;
struct sockaddr_ng *sg;
int sg_len;
int error = 0;
/* Why isn't sg_data a `char[1]' ? :-( */
sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1;
pcbp = sotongpcb(so);
if ((pcbp == NULL) || (pcbp->sockdata == NULL))
/* XXXGL: can this still happen? */
return (EINVAL);
mtx_lock(&pcbp->sockdata->mtx);
if (pcbp->sockdata->node != NULL) {
node_p node = pcbp->sockdata->node;
int namelen = 0; /* silence compiler! */
if (NG_NODE_HAS_NAME(node))
sg_len += namelen = strlen(NG_NODE_NAME(node));
sg = malloc(sg_len, M_SONAME, M_WAITOK | M_ZERO);
if (NG_NODE_HAS_NAME(node))
bcopy(NG_NODE_NAME(node), sg->sg_data, namelen);
sg->sg_len = sg_len;
sg->sg_family = AF_NETGRAPH;
*addr = (struct sockaddr *)sg;
mtx_unlock(&pcbp->sockdata->mtx);
} else {
mtx_unlock(&pcbp->sockdata->mtx);
error = EINVAL;
}
return (error);
}
/*
* 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 *priv;
struct ngpcb *pcbp;
int error;
/* Allocate node private info */
priv = malloc(sizeof(*priv), M_NETGRAPH_SOCK, M_WAITOK | M_ZERO);
/* Setup protocol control block */
if ((error = ng_attach_common(so, NG_CONTROL)) != 0) {
free(priv, M_NETGRAPH_SOCK);
return (error);
}
pcbp = sotongpcb(so);
/* Link the pcb the private data. */
priv->ctlsock = pcbp;
pcbp->sockdata = priv;
priv->refs++;
/* Initialize mutex. */
mtx_init(&priv->mtx, "ng_socket", NULL, MTX_DEF);
/* Make the generic node components */
if ((error = ng_make_node_common(&typestruct, &priv->node)) != 0) {
free(priv, M_NETGRAPH_SOCK);
ng_detach_common(pcbp, NG_CONTROL);
return (error);
}
/* Link the node and the private data. */
NG_NODE_SET_PRIVATE(priv->node, priv);
NG_NODE_REF(priv->node);
priv->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. */
pcbp = malloc(sizeof(struct ngpcb), M_PCB, M_WAITOK | M_ZERO);
pcbp->type = type;
/* Link the pcb and the socket. */
so->so_pcb = (caddr_t)pcbp;
pcbp->ng_socket = so;
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 = pcbp->sockdata;
if (priv != NULL) {
mtx_lock(&priv->mtx);
switch (which) {
case NG_CONTROL:
priv->ctlsock = NULL;
break;
case NG_DATA:
priv->datasock = NULL;
break;
default:
panic(__func__);
}
pcbp->sockdata = NULL;
ng_socket_free_priv(priv);
}
pcbp->ng_socket->so_pcb = NULL;
free(pcbp, M_PCB);
}
/*
* Remove a reference from node private data.
*/
static void
ng_socket_free_priv(struct ngsock *priv)
{
mtx_assert(&priv->mtx, MA_OWNED);
priv->refs--;
if (priv->refs == 0) {
mtx_destroy(&priv->mtx);
free(priv, M_NETGRAPH_SOCK);
return;
}
if ((priv->refs == 1) && (priv->node != NULL)) {
node_p node = priv->node;
priv->node = NULL;
mtx_unlock(&priv->mtx);
NG_NODE_UNREF(node);
ng_rmnode_self(node);
} else
mtx_unlock(&priv->mtx);
}
#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 ng_address_path() to do this.
*/
sap = (struct sockaddr_ng *) nam;
/* The item will hold the node reference. */
item = ng_package_data(NULL, NG_WAITOK);
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.
*/
mtx_lock(&priv->mtx);
priv->datasock = pcbp;
pcbp->sockdata = priv;
priv->refs++;
mtx_unlock(&priv->mtx);
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));
}
/***************************************************************
Netgraph node
***************************************************************/
/*
* 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 socket *so;
struct sockaddr_ng addr;
struct ng_mesg *msg;
struct mbuf *m;
ng_ID_t retaddr = NGI_RETADDR(item);
int addrlen;
int error = 0;
NGI_GET_MSG(item, msg);
NG_FREE_ITEM(item);
/*
* 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;
NG_FREE_MSG(msg);
return (EINVAL);
}
so = pcbp->ng_socket;
#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. */
bzero(&addr, sizeof(addr));
addr.sg_len = sizeof(addr);
addr.sg_family = AF_NETGRAPH;
addrlen = snprintf((char *)&addr.sg_data, sizeof(addr.sg_data),
"[%x]:", retaddr);
if (addrlen < 0 || addrlen > sizeof(addr.sg_data)) {
printf("%s: snprintf([%x]) failed - %d\n", __func__, retaddr,
addrlen);
NG_FREE_MSG(msg);
return (EINVAL);
}
/* Copy the message itself into an mbuf chain. */
m = m_devget((caddr_t)msg, sizeof(struct ng_mesg) + msg->header.arglen,
0, NULL, NULL);
/*
* Here we free the message. We need to do that
* regardless of whether we got mbufs.
*/
NG_FREE_MSG(msg);
if (m == NULL) {
TRAP_ERROR;
return (ENOBUFS);
}
/* Send it up to the socket. */
if (sbappendaddr(&so->so_rcv, (struct sockaddr *)&addr, m, NULL) == 0) {
TRAP_ERROR;
m_freem(m);
error = so->so_error = ENOBUFS;
}
sorwakeup(so);
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);
if (pcbp != NULL)
soisdisconnected(pcbp->ng_socket);
mtx_lock(&priv->mtx);
priv->node = NULL;
NG_NODE_SET_PRIVATE(node, NULL);
ng_socket_free_priv(priv);
NG_NODE_UNREF(node);
return (0);
}
static void
ng_socket_item_applied(void *context, int error)
{
struct ngsock *const priv = (struct ngsock *)context;
mtx_lock(&priv->mtx);
priv->error = error;
wakeup(priv);
mtx_unlock(&priv->mtx);
}
static int
dummy_disconnect(struct socket *so)
{
return (0);
}
/*
* Control and data socket type descriptors
*
* XXXRW: Perhaps _close should do something?
*/
static struct pr_usrreqs ngc_usrreqs = {
.pru_abort = NULL,
.pru_attach = ngc_attach,
.pru_bind = ngc_bind,
.pru_connect = ngc_connect,
.pru_detach = ngc_detach,
.pru_disconnect = dummy_disconnect,
.pru_peeraddr = NULL,
.pru_send = ngc_send,
.pru_shutdown = NULL,
.pru_sockaddr = ng_getsockaddr,
.pru_close = NULL,
};
static struct pr_usrreqs ngd_usrreqs = {
.pru_abort = NULL,
.pru_attach = ngd_attach,
.pru_bind = NULL,
.pru_connect = ngd_connect,
.pru_detach = ngd_detach,
.pru_disconnect = dummy_disconnect,
.pru_peeraddr = NULL,
.pru_send = ngd_send,
.pru_shutdown = NULL,
.pru_sockaddr = ng_getsockaddr,
.pru_close = NULL,
};
/*
* Definitions of protocols supported in the NETGRAPH domain.
*/
extern struct domain ngdomain; /* stop compiler warnings */
static struct protosw ngsw[] = {
{
.pr_type = SOCK_DGRAM,
.pr_domain = &ngdomain,
.pr_protocol = NG_CONTROL,
.pr_flags = PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */,
.pr_usrreqs = &ngc_usrreqs
},
{
.pr_type = SOCK_DGRAM,
.pr_domain = &ngdomain,
.pr_protocol = NG_DATA,
.pr_flags = PR_ATOMIC | PR_ADDR,
.pr_usrreqs = &ngd_usrreqs
}
};
struct domain ngdomain = {
.dom_family = AF_NETGRAPH,
.dom_name = "netgraph",
.dom_protosw = ngsw,
.dom_protoswNPROTOSW = &ngsw[sizeof(ngsw) / sizeof(ngsw[0])]
};
/*
* 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:
#ifdef NOTYET
/* 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, "");