/*
* 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 1.11.2.6 2002/07/02 22:17:18 archie 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/systm.h>
#include <sys/proc.h>
#include <sys/caps.h>
#include <sys/domain.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/filedesc.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#ifdef NOTYET
#include <sys/vnode.h>
#endif
#include <sys/thread2.h>
#include <sys/socketvar2.h>
#include <sys/msgport2.h>
#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include "ng_socketvar.h"
#include "ng_socket.h"
/*
* 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_rmnode;
static ng_newhook_t ngs_newhook;
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 *td); */
static int ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp);
static int ng_connect_cntl(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 = {
NG_VERSION,
NG_SOCKET_NODE_TYPE,
ngs_mod_event,
ngs_constructor,
ngs_rcvmsg,
ngs_rmnode,
ngs_newhook,
NULL,
NULL,
ngs_rcvdata,
ngs_rcvdata,
ngs_disconnect,
NULL
};
NETGRAPH_INIT(socket, &typestruct);
/* Buffer space */
static u_long ngpdg_sendspace = 20 * 1024; /* really max datagram size */
static u_long ngpdg_recvspace = 20 * 1024;
/* List of all sockets */
LIST_HEAD(, ngpcb) ngsocklist;
#define sotongpcb(so) ((struct ngpcb *)(so)->so_pcb)
/* If getting unexplained errors returned, set this to "Debugger("X"); */
#ifndef TRAP_ERROR
#define TRAP_ERROR
#endif
/***************************************************************
Control sockets
***************************************************************/
static void
ngc_attach(netmsg_t msg)
{
struct socket *so = msg->attach.base.nm_so;
struct pru_attach_info *ai = msg->attach.nm_ai;
struct ngpcb *const pcbp = sotongpcb(so);
int error;
if (caps_priv_check(ai->p_ucred,
SYSCAP_RESTRICTEDROOT | __SYSCAP_NULLCRED) != 0)
{
error = EPERM;
}
else if (pcbp != NULL)
error = EISCONN;
else
error = ng_attach_cntl(so);
lwkt_replymsg(&msg->attach.base.lmsg, error);
}
static void
ngc_detach(netmsg_t msg)
{
struct socket *so = msg->detach.base.nm_so;
struct ngpcb *const pcbp = sotongpcb(so);
int error;
if (pcbp) {
ng_detach_common(pcbp, NG_CONTROL);
error = 0;
} else {
error = EINVAL;
}
lwkt_replymsg(&msg->detach.base.lmsg, error);
}
static void
ngc_send(netmsg_t msg)
{
struct socket *so = msg->send.base.nm_so;
struct mbuf *m = msg->send.nm_m;
struct sockaddr *addr = msg->send.nm_addr;
struct mbuf *control = msg->send.nm_control;
struct ngpcb *const pcbp = sotongpcb(so);
struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
struct ng_mesg *resp;
struct mbuf *m0;
char *xmsg, *path = NULL;
int len;
int error = 0;
if (pcbp == NULL) {
error = EINVAL;
goto release;
}
#ifdef NOTYET
if (control && (error = ng_internalize(control, p))) {
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 = kmalloc(len + 1, M_NETGRAPH, 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. */
xmsg = kmalloc(len + 1, M_NETGRAPH, M_WAITOK);
m_copydata(m, 0, len, xmsg);
/* The callee will free the xmsg when done. The addr is our business. */
error = ng_send_msg(pcbp->sockdata->node,
(struct ng_mesg *) xmsg, path, &resp);
/* If the callee responded with a synchronous response, then put it
* back on the receive side of the socket; sap is source address. */
if (error == 0 && resp != NULL)
error = ship_msg(pcbp, resp, sap);
release:
if (path != NULL)
kfree(path, M_NETGRAPH);
if (control != NULL)
m_freem(control);
if (m != NULL)
m_freem(m);
lwkt_replymsg(&msg->send.base.lmsg, error);
}
static void
ngc_bind(netmsg_t msg)
{
struct socket *so = msg->bind.base.nm_so;
struct sockaddr *nam = msg->bind.nm_nam;
struct ngpcb *const pcbp = sotongpcb(so);
int error;
if (pcbp)
error = ng_bind(nam, pcbp);
else
error = EINVAL;
lwkt_replymsg(&msg->bind.base.lmsg, error);
}
static void
ngc_connect(netmsg_t msg)
{
struct socket *so = msg->connect.base.nm_so;
struct sockaddr *nam = msg->connect.nm_nam;
struct ngpcb *const pcbp = sotongpcb(so);
int error;
if (pcbp)
error = ng_connect_cntl(nam, pcbp);
else
error = EINVAL;
lwkt_replymsg(&msg->connect.base.lmsg, error);
}
/***************************************************************
Data sockets
***************************************************************/
static void
ngd_attach(netmsg_t msg)
{
struct socket *so = msg->attach.base.nm_so;
struct ngpcb *const pcbp = sotongpcb(so);
int error;
if (pcbp)
error = EISCONN;
else
error = ng_attach_data(so);
lwkt_replymsg(&msg->connect.base.lmsg, error);
}
static void
ngd_detach(netmsg_t msg)
{
struct socket *so = msg->detach.base.nm_so;
struct ngpcb *const pcbp = sotongpcb(so);
int error;
if (pcbp) {
ng_detach_common(pcbp, NG_DATA);
error = 0;
} else {
error = EINVAL;
}
lwkt_replymsg(&msg->detach.base.lmsg, error);
}
static void
ngd_send(netmsg_t msg)
{
struct socket *so = msg->send.base.nm_so;
struct mbuf *m = msg->send.nm_m;
struct sockaddr *addr = msg->send.nm_addr;
struct mbuf *control = msg->send.nm_control;
struct ngpcb *const pcbp = sotongpcb(so);
struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
meta_p mp = NULL;
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 (pcbp->sockdata->node->numhooks != 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->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->hooks, hooks) {
if (strcmp(hookname, hook->name) == 0)
break;
}
if (hook == NULL)
error = EHOSTUNREACH;
}
/* Send data (OK if hook is NULL) */
NG_SEND_DATA(error, hook, m, mp); /* makes m NULL */
release:
if (control != NULL)
m_freem(control);
if (m != NULL)
m_freem(m);
lwkt_replymsg(&msg->send.base.lmsg, error);
}
static void
ngd_connect(netmsg_t msg)
{
struct socket *so = msg->connect.base.nm_so;
struct sockaddr *nam = msg->connect.nm_nam;
struct ngpcb *const pcbp = sotongpcb(so);
int error;
if (pcbp) {
error = ng_connect_data(nam, pcbp);
} else {
error = EINVAL;
}
lwkt_replymsg(&msg->connect.base.lmsg, error);
}
/*
* Used for both data and control sockets
*/
static void
ng_setsockaddr(netmsg_t msg)
{
struct socket *so = msg->sockaddr.base.nm_so;
struct sockaddr **addr = msg->sockaddr.nm_nam;
struct ngpcb *pcbp;
struct sockaddr_ng *sg;
int sg_len, namelen;
int error;
/* Why isn't sg_data a `char[1]' ? :-( */
sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1;
crit_enter();
pcbp = sotongpcb(so);
if ((pcbp == NULL) || (pcbp->sockdata == NULL)) {
crit_exit();
error = EINVAL;
goto out;
}
namelen = 0; /* silence compiler ! */
if (pcbp->sockdata->node->name != NULL)
sg_len += namelen = strlen(pcbp->sockdata->node->name);
sg = kmalloc(sg_len, M_SONAME, M_WAITOK | M_ZERO);
if (pcbp->sockdata->node->name != NULL)
bcopy(pcbp->sockdata->node->name, sg->sg_data, namelen);
crit_exit();
sg->sg_len = sg_len;
sg->sg_family = AF_NETGRAPH;
*addr = (struct sockaddr *)sg;
error = 0;
out:
lwkt_replymsg(&msg->sockaddr.base.lmsg, 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 *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 */
privdata = kmalloc(sizeof(*privdata), M_NETGRAPH, M_WAITOK | M_ZERO);
/* Make the generic node components */
if ((error = ng_make_node_common(&typestruct, &privdata->node)) != 0) {
kfree(privdata, M_NETGRAPH);
ng_detach_common(pcbp, NG_CONTROL);
return (error);
}
privdata->node->private = 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, NULL);
if (error)
return (error);
/* Allocate the pcb */
pcbp = kmalloc(sizeof(*pcbp), M_PCB, M_WAITOK | M_ZERO);
pcbp->type = type;
/* Link the pcb and the socket */
soreference(so);
so->so_pcb = (caddr_t) pcbp;
pcbp->ng_socket = so;
/* Add the socket to linked list */
LIST_INSERT_HEAD(&ngsocklist, pcbp, socks);
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 *sockdata;
struct socket *so;
if (pcbp->sockdata) {
sockdata = pcbp->sockdata;
pcbp->sockdata = NULL;
switch (which) {
case NG_CONTROL:
sockdata->ctlsock = NULL;
break;
case NG_DATA:
sockdata->datasock = NULL;
break;
default:
panic(__func__);
}
if ((--sockdata->refs == 0) && (sockdata->node != NULL))
ng_rmnode(sockdata->node);
}
so = pcbp->ng_socket;
so->so_pcb = NULL;
pcbp->ng_socket = NULL;
sofree(so); /* remove pcb ref */
LIST_REMOVE(pcbp, socks);
kfree(pcbp, M_PCB);
}
#ifdef NOTYET
/*
* File descriptors can be passed into a 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)
{
struct filedesc *fdp = p->p_fd;
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 = (cm->cmsg_len - sizeof(*cm)) / 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 = *(int *) (cm + 1);
if ((unsigned) fd >= fdp->fd_nfiles
|| (fp = fdp->fd_files[fd].fp) == NULL) {
return (EBADF);
}
/* Depending on what kind of resource it is, act differently. For
* devices, we treat it as a file. For a AF_NETGRAPH socket,
* shortcut straight to the node. */
switch (fp->f_type) {
case DTYPE_VNODE:
vn = (struct vnode *) fp->f_data;
if (vn && (vn->v_type == VCHR)) {
/* for a VCHR, actually reference the FILE */
fhold(fp);
/* XXX then what :) */
/* how to pass on to other modules? */
} else {
TRAP_ERROR;
return (EINVAL);
}
break;
default:
TRAP_ERROR;
return (EINVAL);
}
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 *sockdata;
int error;
/* 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. */
sap = (struct sockaddr_ng *) nam;
if ((error = ng_path2node(NULL, sap->sg_data, &farnode, NULL)))
return (error);
if (strcmp(farnode->type->name, NG_SOCKET_NODE_TYPE) != 0)
return (EINVAL);
sockdata = farnode->private;
if (sockdata->datasock != NULL)
return (EADDRINUSE);
/* Link the PCB and the private data struct. and note the extra
* reference */
sockdata->datasock = pcbp;
pcbp->sockdata = sockdata;
sockdata->refs++;
return (0);
}
/*
* Connect the existing control socket node to a named node:hook.
* The hook we use on this end is the same name as the remote node name.
*/
static int
ng_connect_cntl(struct sockaddr *nam, struct ngpcb *pcbp)
{
struct ngsock *const sockdata = pcbp->sockdata;
struct sockaddr_ng *sap;
char *node, *hook;
node_p farnode;
int rtn, error;
sap = (struct sockaddr_ng *) nam;
rtn = ng_path_parse(sap->sg_data, &node, NULL, &hook);
if (rtn < 0 || node == NULL || hook == NULL) {
TRAP_ERROR;
return (EINVAL);
}
farnode = ng_findname(sockdata->node, node);
if (farnode == NULL) {
TRAP_ERROR;
return (EADDRNOTAVAIL);
}
/* Connect, using a hook name the same as the far node name. */
error = ng_con_nodes(sockdata->node, node, farnode, hook);
return error;
}
/*
* Binding a socket means giving the corresponding node a name
*/
static int
ng_bind(struct sockaddr *nam, struct ngpcb *pcbp)
{
struct ngsock *const sockdata = pcbp->sockdata;
struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam;
if (sockdata == NULL) {
TRAP_ERROR;
return (EINVAL);
}
if (sap->sg_len < 3 || sap->sg_data[sap->sg_len - 3] != '\0') {
TRAP_ERROR;
return (EINVAL);
}
return (ng_name_node(sockdata->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);
/* Here we free the message, as we are the end of the line.
* We need to do that regardless of whether we got mbufs. */
kfree(msg, M_NETGRAPH);
if (mdata == NULL) {
TRAP_ERROR;
return (ENOBUFS);
}
/* Send it up to the socket */
lwkt_gettoken(&so->so_rcv.ssb_token);
if (ssb_appendaddr(&so->so_rcv,
(struct sockaddr *) addr, mdata, NULL) == 0) {
soroverflow(so);
lwkt_reltoken(&so->so_rcv.ssb_token);
TRAP_ERROR;
m_freem(mdata);
return (ENOBUFS);
}
sorwakeup(so);
lwkt_reltoken(&so->so_rcv.ssb_token);
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)
{
hook->private = node->private;
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, struct ng_mesg *msg, const char *retaddr,
struct ng_mesg **resp)
{
struct ngsock *const sockdata = node->private;
struct ngpcb *const pcbp = sockdata->ctlsock;
struct sockaddr_ng *addr;
int addrlen;
int error = 0;
/* 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);
}
if (msg->header.typecookie == NGM_SOCKET_COOKIE) {
switch (msg->header.cmd) {
case NGM_SOCK_CMD_NOLINGER:
sockdata->flags |= NGS_FLAG_NOLINGER;
break;
case NGM_SOCK_CMD_LINGER:
sockdata->flags &= ~NGS_FLAG_NOLINGER;
break;
default:
error = EINVAL; /* unknown command */
}
/* Free the message and return */
kfree(msg, M_NETGRAPH);
return(error);
}
/* Get the return address into a sockaddr */
if ((retaddr == NULL) || (*retaddr == '\0'))
retaddr = "";
addrlen = strlen(retaddr);
addr = kmalloc(addrlen + 4, M_NETGRAPH, M_NOWAIT);
if (addr == NULL) {
TRAP_ERROR;
return (ENOMEM);
}
addr->sg_len = addrlen + 3;
addr->sg_family = AF_NETGRAPH;
bcopy(retaddr, addr->sg_data, addrlen);
addr->sg_data[addrlen] = '\0';
/* Send it up */
error = ship_msg(pcbp, msg, addr);
kfree(addr, M_NETGRAPH);
return (error);
}
/*
* Receive data on a hook
*/
static int
ngs_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
{
struct ngsock *const sockdata = hook->node->private;
struct ngpcb *const pcbp = sockdata->datasock;
struct socket *so;
struct sockaddr_ng *addr;
char *addrbuf[NG_HOOKSIZ + 4];
int addrlen;
/* If there is no data socket, black-hole it */
if (pcbp == NULL) {
NG_FREE_DATA(m, meta);
return (0);
}
so = pcbp->ng_socket;
/* Get the return address into a sockaddr. */
addrlen = strlen(hook->name); /* <= NG_HOOKSIZ - 1 */
addr = (struct sockaddr_ng *) addrbuf;
addr->sg_len = addrlen + 3;
addr->sg_family = AF_NETGRAPH;
bcopy(hook->name, addr->sg_data, addrlen);
addr->sg_data[addrlen] = '\0';
/* We have no use for the meta data, free/clear it now. */
NG_FREE_META(meta);
/* Try to tell the socket which hook it came in on */
lwkt_gettoken(&so->so_rcv.ssb_token);
if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *) addr, m, NULL) == 0) {
soroverflow(so);
lwkt_reltoken(&so->so_rcv.ssb_token);
m_freem(m);
TRAP_ERROR;
return (ENOBUFS);
}
sorwakeup(so);
lwkt_reltoken(&so->so_rcv.ssb_token);
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)
{
struct ngsock *const sockdata = hook->node->private;
if ((sockdata->flags & NGS_FLAG_NOLINGER )
&& (hook->node->numhooks == 0)) {
ng_rmnode(hook->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_rmnode(node_p node)
{
struct ngsock *const sockdata = node->private;
struct ngpcb *const dpcbp = sockdata->datasock;
struct ngpcb *const pcbp = sockdata->ctlsock;
ng_cutlinks(node);
ng_unname(node);
if (dpcbp != NULL) {
soisdisconnected(dpcbp->ng_socket);
dpcbp->sockdata = NULL;
sockdata->datasock = NULL;
sockdata->refs--;
}
if (pcbp != NULL) {
soisdisconnected(pcbp->ng_socket);
pcbp->sockdata = NULL;
sockdata->ctlsock = NULL;
sockdata->refs--;
}
node->private = NULL;
ng_unref(node);
kfree(sockdata, M_NETGRAPH);
return (0);
}
/*
* Control and data socket type descriptors
*/
static struct pr_usrreqs ngc_usrreqs = {
.pru_abort = NULL,
.pru_accept = pr_generic_notsupp,
.pru_attach = ngc_attach,
.pru_bind = ngc_bind,
.pru_connect = ngc_connect,
.pru_connect2 = pr_generic_notsupp,
.pru_control = pr_generic_notsupp,
.pru_detach = ngc_detach,
.pru_disconnect = NULL,
.pru_listen = pr_generic_notsupp,
.pru_peeraddr = NULL,
.pru_rcvd = pr_generic_notsupp,
.pru_rcvoob = pr_generic_notsupp,
.pru_send = ngc_send,
.pru_sense = pru_sense_null,
.pru_shutdown = NULL,
.pru_sockaddr = ng_setsockaddr,
.pru_sosend = sosend,
.pru_soreceive = soreceive
};
static struct pr_usrreqs ngd_usrreqs = {
.pru_abort = NULL,
.pru_accept = pr_generic_notsupp,
.pru_attach = ngd_attach,
.pru_bind = NULL,
.pru_connect = ngd_connect,
.pru_connect2 = pr_generic_notsupp,
.pru_control = pr_generic_notsupp,
.pru_detach = ngd_detach,
.pru_disconnect = NULL,
.pru_listen = pr_generic_notsupp,
.pru_peeraddr = NULL,
.pru_rcvd = pr_generic_notsupp,
.pru_rcvoob = pr_generic_notsupp,
.pru_send = ngd_send,
.pru_sense = pru_sense_null,
.pru_shutdown = NULL,
.pru_sockaddr = ng_setsockaddr,
.pru_sosend = sosend,
.pru_soreceive = soreceive
};
/*
* 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[NELEM(ngsw)],
};
/*
* 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
/* Unregister protocol domain XXX can't do this yet.. */
if ((error = net_rm_domain(&ngdomain)) != 0)
break;
#else
error = EBUSY;
#endif
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, "");